KR20180125030A

KR20180125030A - Liquid crystal display element

Info

Publication number: KR20180125030A
Application number: KR1020187032430A
Authority: KR
Inventors: 가즈노리 마루야마; 쓰요시 사사키; 신지 오가와
Original assignee: 디아이씨 가부시끼가이샤
Priority date: 2016-06-23
Filing date: 2017-06-08
Publication date: 2018-11-21
Also published as: JPWO2017221724A1; KR102009616B1; JP6414723B2; WO2017221724A1

Abstract

An object of the present invention is to provide a liquid crystal display element which focuses attention on a liquid crystal layer and which is reduced and suppressed in flicker and which is driven with low power consumption.
[MEANS FOR SOLVING PROBLEMS] A liquid crystal display device includes a liquid crystal layer containing a first transparent substrate, a second transparent substrate disposed opposite to the first transparent substrate, and a liquid crystal composition provided between the first transparent substrate and the second transparent substrate, A pixel electrode arranged on one transparent substrate and a display processing unit for controlling a frame frequency of an image signal to the pixel electrode to be in a range of 59 Hz or less to 0 Hz or more and to include a specific liquid crystal compound in the liquid crystal composition A liquid crystal display element.

Description

Liquid crystal display element

The present invention relates to a liquid crystal display element.

Typical display methods of liquid crystal display devices to be used for a clock, a calculator, various measurement devices, an automobile panel, a printer, a computer, a television, a watch and an advertisement display panel are TN (twisted nematic) type, STN Twisted nematic) type VA, VA (hereinafter, also referred to as vertical orientation) type or IPS (in-plane switching) type using TFT (thin film transistor), FFS (fringe field switching) and the like. As a liquid crystal display element widely used in PC monitors and the like, there are TN type and STN type, and display methods of liquid crystal display elements widely used in liquid crystal TVs and the like include VA type and IPS type, And IPS liquid crystal display devices, and FFS liquid crystal display devices. In all of these driving methods, there is a demand for a liquid crystal display device which exhibits a low-voltage driving, a high-speed response, and a wide operating temperature range.

Among them, liquid-crystal display devices driven by low power consumption are attracting attention as a theme of low-voltage driving due to the spread of social issues and smart phones that promote energy saving of the time. At present, as means for lowering the power consumption, there has been proposed a low frequency drive for lowering the drive frequency of the liquid crystal display element than the standard state, or an intermittent drive for setting the idle period after writing in one frame period. However, since the voltage greatly changes at the time of switching from the writing period to the rest period, and the pixel potential greatly fluctuates, due to the difference between the display luminance in the rest period and the display luminance in the writing period in the next frame period, In particular, it has been confirmed that a flicker occurs at the time of switching of the frame period, and the display quality is lowered.

It is believed that such a flicker is related to various factors such as flicker caused by the flexo polarization of the liquid crystal molecules and flicker caused by the leakage current.

For example, when a long time DC voltage is applied to the liquid crystal layer, the display characteristic is changed over time due to charge up, Frame driving for inverting positive and negative polarities is generally used for each frame. It is ideal to control the alignment state of the liquid crystal molecules only based on the potential difference between the pixel electrode and the counter electrode. Actually, since the strong electric field acts on the edge of the pixel electrode, the liquid crystal molecules are reversely polarized, and when the polarity of the electric field is reversed Since this polarization (flexo polarization) reacts instantaneously, flicker occurs due to the luminance variation.

Patent Literature 1 is a technique for reducing flicker caused by flexo polarization. In this patent document 1, the absolute value of the flexo modulus (e ₁₁ , e ₃₃ ) of the liquid crystal used in the liquid crystal display element is set to 1.6 pC / m or less to reduce both the luminance amplitude of the symmetric component and the opposite symmetric component, It can be reduced.

When the time for supplying the driving power to the liquid crystal display element is shortened, for example, in a period in which there is no external power supply (idle period or low-valley valley state) A leak current flows through the channel of the pixel electrode or the TFT, so that the pixel voltage applied to the liquid crystal decreases with time. As a result, since the orientation direction of the liquid crystal molecules changes over time, the luminance decreases, and when an image is reproduced in a state in which the luminance decreases per frame, flicker occurs.

Patent Document 2 discloses a technique for reducing flicker due to a leakage current of a TFT. In Patent Document 2, the numerical range of the off-leak current, the numerical range of the resistivity of the liquid crystal used in the liquid crystal display element, and the resistivity of the alignment film are respectively defined, and when the numerical range is established in a predetermined relation, It can be reduced.

Japanese Patent Laid-Open No. 2015-31877 Japanese Patent Application Laid-Open No. 2015-75723

In the above-mentioned Patent Document 1, although the flexo coefficients (e11, e33) of the liquid crystal molecules are considered as the cause of the flicker, the cause of the flicker is not only complicatedly related to various factors, (Polar component) having a negative anisotropy of dielectric constant (polar component) and a compound having a neutral dielectric anisotropy (non-polar component) are mixed, and several to several dozen kinds of liquid crystal compounds are included in the liquid crystal composition as a whole. Therefore, since the liquid crystal compound actually contributing to the polarization is a compound (polar component) having a negative dielectric anisotropy of a part of the liquid crystal composition, the polarization of the liquid crystal molecules constituting the liquid crystal layer is averaged And the effect of reducing or suppressing flicker can not be exhibited.

Further, in Patent Document 2, when the absolute value of the rate of luminance change in one frame is reduced to 0.03 or less, flicker is not visually recognized, and the decrease in luminance due to TFT off-leak is caused by an increase in luminance due to impedance mismatching between the liquid crystal and the alignment film However, the cause of the flickering is not only complicated by various factors but also the relationship between the resistance and capacity of the liquid crystal and the resistance and the capacity of the alignment film in the cited document 2, and the compound used in the liquid crystal layer The characteristics and the kind of the liquid crystal layer and the voltage holding ratio of the liquid crystal layer are not taken into consideration. Therefore, the effect of reducing or suppressing flickering is not exerted. In addition, it has been confirmed that the liquid crystal display device is always irradiated with light from the backlight, thereby causing a problem due to deterioration with time of the liquid crystal layer.

Therefore, an aspect of the present invention aims at achieving both low power consumption driving and reduction / suppression of flicker by a liquid crystal layer including a liquid crystal composition containing a liquid crystal compound exhibiting a specific negative dielectric anisotropy.

The liquid crystal display element according to the present invention achieves both low power consumption driving and reduction and suppression of flicker.

1 is a diagram schematically showing an example of the configuration of a liquid crystal display element (liquid crystal display part) of the present invention.
Fig. 2 is a schematic diagram showing the structure of the electrode layer 3 of the liquid crystal display part, and is a schematic diagram showing the pixel part by an equivalent circuit.
3 is a schematic view showing the structure of the electrode layer 3 of the liquid crystal display part and is a schematic view showing an example of the shape of the pixel electrode.
4 is a schematic view showing the structure of the electrode layer 3 of the liquid crystal display part, and is a schematic view showing an example of the shape of the pixel electrode.
5 is a schematic view showing the structure of the electrode layer 3 of the liquid crystal display part and is a schematic view showing an example of the shape of the pixel electrode.
Fig. 6 is another example of a cross-sectional view of the liquid crystal display element shown in Fig. 1 cut along the line III-III in Fig. 3 or Fig.
Fig. 7 is a cross-sectional view of the IPS liquid crystal display portion shown in Fig. 1 cut along the line III-III in Fig. 5. Fig.
8 is a diagram schematically showing the structure of a liquid crystal display part of a vertically aligned liquid crystal display element.
9 is an enlarged plan view of an area surrounded by an II line of an electrode layer 3 (or thin film transistor layer 3) including a thin film transistor formed on a substrate in Fig.
10 is a cross-sectional view of the liquid crystal display element shown in Fig. 8 cut along the line III-III in Fig.
11 (A) is a diagram showing a change over time of the rewriting of the image signal in the pixel electrode of 2m row 2n column. 11B is a diagram showing one form of the temporal change of the rewriting of the image signal in the pixel electrode of 2m + 1 row and 2n + 1 column.
12A is a diagram showing a change over time of rewriting of an image signal in a pixel electrode of 2m row 2n column. Fig. 12B is a diagram showing one form of temporal change of rewriting of an image signal in the pixel electrode of 2m + 1 row and 2n + 1 column.
Fig. 13A is a diagram showing a change over time of the rewriting of the image signal in the pixel electrodes in the 2m row and 2n column. 13B is a diagram showing a form of temporal change of rewriting of an image signal in a pixel electrode of 2m + 1 row and 2n + 1 column.

A first aspect of the present invention is a liquid crystal display comprising a first transparent substrate, a second transparent substrate disposed opposite to the first transparent substrate, and a liquid crystal layer containing a liquid crystal composition filled between the first transparent substrate and the second transparent substrate A pixel electrode disposed on the first transparent substrate; and a display processing unit for controlling a frame frequency of an image signal to the pixel electrode to a range of more than 0 Hz and not more than 59 Hz, wherein the liquid crystal composition is represented by the following general formula (i ):

( ^Wherein R ⁱ¹ and R ⁱ² each independently represent an alkyl group of 1 to 10 carbon atoms, and at least one of -CH ₂ - in the alkyl group or the non-adjacent alkyl group is independently -CH = CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-,

A ⁱ¹ and A ⁱ² are each independently

(a) a 1,4-cyclohexylene group (one -CH ₂ - present in this group or two or more non-adjacent -CH ₂ - groups may be substituted with -O-) and

(b) 1,4-phenylene group (one -CH = in this group or two or more non-adjacent -CH = may be replaced by -N =).

(c) 1,4-cyclohexenylene group

(B) and (c) each independently represent a group selected from the group consisting of a cyano group, a fluorine atom and a chlorine atom,

Z ⁱ¹ and Z ⁱ² each independently represent a single bond, -OCH ₂ -, -CH ₂ O-, -OCF ₂ -, -CF ₂ O-, -CH ₂ CH ₂ - or -CF ₂ CF ₂ -

m ⁱ¹ and m ⁱ² each independently represent an integer of 0 to 3, where m ⁱ¹ + m ⁱ² are independently 1, 2 or 3, and when a plurality of A ⁱ¹ to A ⁱ² and Z ⁱ¹ to Z ⁱ² exist , They may be the same or different.). The liquid crystal display element is one containing at least one compound selected from the group consisting of compounds represented by the following formulas.

Thus, it is possible to suppress or prevent flicker that occurs when low-frequency drive or intermittent drive is performed.

The liquid crystal display element according to the present invention preferably has a liquid crystal display part (so-called liquid crystal panel) and a display processing part. The liquid crystal display part is a liquid crystal layer encapsulated between a driving substrate on which a driving circuit including a pixel electrode and a thin film transistor is disposed for each pixel and a counter substrate, as described later in Figs. 1 to 10 and the like.

The display processing unit performs processing such as frame rate conversion on the video signal, and controls the backlight and the liquid crystal display unit according to the processing result.

Hereinafter, the liquid crystal display portion and the liquid crystal layer of the liquid crystal display element according to the present invention will be described, and the operation and action of the display processing portion will be described based on the drawings.

One embodiment of a liquid crystal display part of a liquid crystal display element according to the present invention will be described. Fig. 1 is a diagram schematically showing a configuration of a liquid crystal display part of a liquid crystal display element. In Fig. 1, for convenience of description, the components are described separately. 1, a liquid crystal display element 10 according to the present invention includes a first (transparent insulation) substrate 2 (also referred to as a transparent substrate) 2 and a second (transparent insulation) substrate 7 (Or the liquid crystal layer 5) sandwiched between the liquid crystal layer and the liquid crystal layer. In the first (transparent insulation) substrate 2, the electrode layer 3 is formed on the surface of the liquid crystal layer 5 side. An alignment film 4 is provided between the liquid crystal layer 5 and each of the first (transparent insulation) substrate 2 and the second (transparent insulation) substrate 7, and by the alignment film 4 The liquid crystal molecules in the liquid crystal composition can be oriented in a predetermined direction with respect to the substrates 2 and 7 when no voltage is applied. 1, a pixel electrode (not shown) and a common electrode (not shown) are provided on the first substrate 2 side as the electrode layer 3, but the pixel electrode is provided on the first substrate 2, The electrode may be provided on the second substrate 7.

1 shows a state in which the second substrate 7 and the first substrate 2 are sandwiched by a pair of polarizers 1 and 8. It should be noted that a position where the polarizers 1 and 8 are provided Is not limited to this drawing. In Fig. 1, a color filter 6 is provided between the second substrate 7 and the alignment film 4. Fig. The color filter 6 may be provided between the electrode layer 3 and the liquid crystal layer 5, or alternatively, the color filter 6 may be provided between the electrode layer 3 and the liquid crystal layer 5. Alternatively, the liquid crystal display element according to the present invention may be a so- A color filter may be provided between the first substrate 3 and the first substrate 2. If necessary, an overcoat layer (not shown) may be provided so as to cover the color filter layer 6 to prevent the material contained in the color filter layer from flowing out to the liquid crystal layer.

1 to 7 illustrate a preferred embodiment of a liquid crystal display element according to the present invention in which the liquid crystal layer 5 and the first substrate 2 and the liquid crystal layer 5 and the second substrate 7 The liquid crystal display element of the present invention is not limited to the first substrate 2 or the second substrate 2 and the liquid crystal layer 5 may be formed on the first substrate 2 or the second substrate, (4) may be formed on at least one side of the substrate (7). For example, when the alignment film 4 is formed between the liquid crystal layer 5 and the first substrate 2 so as to be in contact with the liquid crystal layer 5 on the first substrate 2, An orientation film may not be provided between the layer 5 and the second substrate 7.

That is, the liquid crystal display element 10 according to the present invention includes a first substrate 2, an electrode layer 3, an orientation film 4, a liquid crystal layer 5 including a liquid crystal composition, an orientation film 4, 6, and a second substrate 7 are sequentially stacked.

The first substrate 2 and the second substrate 7 may be made of a flexible material such as glass or plastic. At least one of them may be a transparent material and the other may be a transparent material. Material. The two substrates are bonded together by a sealant and an encapsulating material such as an epoxy thermosetting composition disposed in the peripheral region. In order to maintain the inter-substrate distance therebetween, for example, glass particles, plastic particles, alumina particles Or a spacer column made of a resin formed by a photolithography method may be disposed.

FIG. 2 is a schematic view showing an equivalent circuit of the pixel portion, and FIGS. 3 and 4 are schematic views showing an example of the shape of the pixel electrode. FIG. 2 is a schematic view of the structure of the electrode layer 3 of the liquid crystal display part. More specifically, to be. 2 to 4 show an FFS type liquid crystal display element including a liquid crystal display portion including pixels arranged in a mesh shape as an example of the present embodiment. And a backlight is provided as lighting means for illuminating the liquid crystal display unit from the rear side, thereby driving the liquid crystal display unit. As the light source of the backlight, a light emitting diode or a cold cathode tube can be used.

2, the electrode layer 3 according to the present invention includes a common electrode and a plurality of pixel electrodes. The pixel electrode is disposed on the common electrode through an insulating layer (for example, silicon nitride (SiN) or the like). The pixel electrode is arranged for each display pixel, and a slit-shaped opening is formed. The common electrode and the pixel electrode are transparent electrodes formed by, for example, ITO (Indium Tin Oxide), and the electrode layer 3 includes a gate bus line GBL And source bus lines SBL1, SBL2, ... SBLm extending along columns in which a plurality of display pixels are arranged and a plurality of source bus lines SBL1, SBL2 ... SBLm extending in the vicinity of positions where the gate bus lines and the source bus lines cross each other And a thin film transistor is provided as a pixel switch. Further, the gate electrode of the thin film transistor is electrically connected to the corresponding gate bus line GBL, and the source electrode of the thin film transistor is electrically connected to the corresponding signal line SBL. Further, the drain electrode of the thin film transistor is electrically connected to the corresponding pixel electrode.

The electrode layer 3 includes a gate driver and a source driver as driving means for driving a plurality of display pixels, and the gate driver and the source driver are arranged around the liquid crystal display portion. A plurality of gate bus lines are electrically connected to output terminals of the gate driver, and a plurality of source bus lines are electrically connected to output terminals of the source driver.

The gate driver successively applies an on voltage to a plurality of gate bus lines to supply a turn-on voltage to the gate electrodes of the thin film transistors electrically connected to the selected gate bus line. The source-drain electrodes of the thin film transistor to which the on voltage is supplied to the gate electrode are made conductive. The source driver supplies an output signal corresponding to each of the plurality of source bus lines. The signal supplied to the source bus line is applied to the corresponding pixel electrode through the thin film transistor which is conductive between the source and drain electrodes. The gate driver and the source driver are controlled in operation by a display processing unit (also referred to as a control circuit) arranged outside the liquid crystal display element.

The display processing unit according to the present invention is provided with a low frequency drive function and an intermittent drive function for reducing drive power in addition to the normal drive and includes an operation of a gate driver which is an LSI for driving a gate bus line of a TFT liquid crystal panel, And controls the operation of the source driver which is the LSI for driving the source bus line. Further, the common voltage (V _COM ) is supplied to the common electrode to control the operation of the backlight.

Fig. 3 is a plan view showing a comb-shaped pixel electrode as an example of the shape of the pixel electrode and an enlarged view of a region surrounded by the II line of the electrode layer 3 formed on the substrate 2 in Fig. 3, the electrode layer 3 including the thin film transistor formed on the surface of the first substrate 2 is connected to a plurality of gate bus lines 26 for supplying scan signals and a display signal A plurality of source bus lines 25 are arranged in a matrix form so as to intersect with each other. A unit pixel of the liquid crystal display device is formed by the plurality of gate bus lines 26 and the region surrounded by the plurality of source bus lines 25 and the pixel electrode 21 and the common electrode 22 are formed. A thin film transistor including a source electrode 27, a drain electrode 24 and a gate electrode 28 is provided in the vicinity of the intersection where the gate bus line 26 and the source bus line 25 intersect each other. This thin film transistor is connected to the pixel electrode 21 as a switching element for supplying a display signal to the pixel electrode 21. [ In addition, a common line 29 is provided alongside the gate bus line 26. The common line 29 is connected to the common electrode 22 in order to supply a common signal to the common electrode 22.

A common electrode 22 is formed on one surface of the rear surface of the pixel electrode 21 through an insulating protective layer 18 (not shown). The shortest distance between the adjacent common electrode and the pixel electrode is shorter than the shortest distance (cell gap) between the alignment layers. It is preferable that the surface of the pixel electrode is covered with a protective insulating film and an orientation film layer. A storage capacitor 23 for storing a display signal supplied through the source bus line 25 may be provided in an area surrounded by the plurality of gate bus lines 26 and the plurality of source bus lines 25. [

Fig. 4 is a modification of Fig. 3 and shows a slit-shaped pixel electrode as an example of the shape of the pixel electrode. The pixel electrode 21 shown in Fig. 4 has a structure in which an electrode of a substantially rectangular flat plate is cut off by a notch portion having a triangular shape at the center and both ends of the flat plate, and the other portion is cut out by a notch portion having a substantially rectangular frame- Shape. The shape of the notch portion is not particularly limited, and a notch portion of a known shape such as an ellipse, a circle, a rectangular shape, a rhombus, a triangle, or a parallelogram may be used.

3 and 4, only a pair of gate bus lines 26 and a pair of source bus lines 25 in one pixel are shown.

Fig. 6 is an example of a cross-sectional view of the liquid crystal display element shown in Fig. 1 cut along the line III-III in Fig. 3 or Fig. A first substrate 2 on which an electrode layer 3 including an orientation film 4 and a thin film transistor is formed on a surface and a second substrate 7 on which an orientation film 4 is formed on a surface are arranged at a predetermined gap G, And the liquid crystal layer 5 containing the liquid crystal composition is filled in this space. The gate insulating film 12, the common electrode 22, the insulating protective layer 18, the pixel electrode 21 and the alignment film 4 are stacked in this order on a part of the surface of the first substrate 2.

6, the gate electrode 11 formed on the surface of the substrate 2 and the gate electrode 11 covering the gate electrode 11 are formed on the surface of the substrate 2, A semiconductor layer 13 formed on the surface of the gate insulating film 12 so as to face the gate electrode 11 and a portion of the surface of the semiconductor layer 13 (14) covering one side end portion of the insulating layer (14) and the semiconductor layer (13) and contacting the gate insulating film (12) formed on the surface of the substrate (2) And a gate insulating film (12) covering the other side end of the insulating layer (14) and the semiconductor layer (13) and in contact with the gate insulating film (12) The electrode 17, the drain electrode 16, and the source electrode 17 It has an installed insulating protective layer (18). An anodic oxidation film (not shown) may be formed on the surface of the gate electrode 11 for reasons such as eliminating a step with the gate electrode.

3 and 4, the common electrode 22 is a plate-shaped electrode formed on almost the entire surface of the gate insulating film 12, while the pixel electrode 21 is an insulating protection covering the common electrode 22 Is a comb-shaped electrode formed on the layer (18). That is, the common electrode 22 is disposed closer to the first substrate 2 than the pixel electrode 21, and these electrodes are overlapped with each other via the insulating protection layer 18. The pixel electrode 21 and the common electrode 22 are formed of a transparent conductive material such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), IZTO (Indium Zinc Tin Oxide), or the like. Since the pixel electrode 21 and the common electrode 22 are formed of a transparent conductive material, the area opened in the unit pixel area is increased, and the aperture ratio and transmittance are increased.

The pixel electrode 21 and the common electrode 22 are arranged such that the interelectrode distance between the pixel electrode 21 and the common electrode 22 (also referred to as a minimum separation distance) (R Is smaller than the thickness (G) of the liquid crystal layer (5) between the first substrate (2) and the second substrate (7). Here, the interelectrode distance R represents the distance in the horizontal direction to the substrate between the electrodes. 3 shows an example in which the minimum spacing distance (or inter-electrode distance) R = 0 because the flat common electrode 22 overlaps with the comb-shaped pixel electrode 21, and the minimum spacing distance R Is smaller than the thickness (also referred to as cell gap) G of the liquid crystal layer between the first substrate 2 and the second substrate 7, an electric field E of the fringe is formed. Therefore, in the FFS type liquid crystal display element, a horizontal electric field and a parabolic electric field, which are formed in a direction perpendicular to the line forming the comb-shaped pixel electrode 21, can be used. The electrode width l of the comb-shaped portion of the pixel electrode 21 and the width m of the gap of the comb-shaped portion of the pixel electrode 21 are set such that all the liquid crystal molecules in the liquid crystal layer 5 are driven by the generated electric field It is preferable that the width is as wide as possible. The minimum distance R between the pixel electrode and the common electrode can be adjusted as the (average) film thickness of the gate insulating film 12. [

An example of an IPS-type liquid crystal display element which is an FFS type modification of the liquid crystal display part of the liquid crystal display element according to the present invention will be described with reference to Figs. 1, 5, and 7. Fig. The IPS type liquid crystal display device has a structure in which an electrode layer 3 (including a common electrode and a pixel electrode and a TFT) is provided on a substrate on one side like the FFS type shown in Fig. 1, A liquid crystal layer 5 including a liquid crystal composition, an alignment film 4, a color filter 6, a second substrate 7, a second polarizing plate 6, and a second polarizing plate 7. The first substrate 2, the electrode layer 3, (8) are sequentially stacked.

5 is a plan view of a part of the region surrounded by the II line of the electrode layer 3 formed on the first substrate 2 of Fig. 1 in the IPS type liquid crystal display part. 5, in a region surrounded by a plurality of gate bus lines 26 for supplying scan signals and a plurality of source bus lines 25 for supplying display signals (within a unit pixel), a comb-shaped The first electrode (e.g., the pixel electrode) 21 and the comb-shaped second electrode (e.g., the common electrode) 22 of the first electrode 22 are mutually engaged In a state in which they are spaced apart from each other. The unit pixel includes a thin film including a source electrode 27, a drain electrode 24, and a gate electrode 28 in the vicinity of an intersection where the gate bus line 26 and the source bus line 25 intersect with each other. Transistor is installed. This thin film transistor is a switching element for supplying a display signal to the first electrode 21, and is connected to the first electrode 21. In addition, a common line (V _com ) 29 is provided in parallel with the gate bus line 26. The common line 29 is connected to the second electrode 22 in order to supply a common signal to the second electrode 22.

Fig. 7 is a cross-sectional view of the IPS-type liquid crystal display portion shown in Fig. 1 cut along the line III-III in Fig. A gate insulating layer 32 covering the gate bus line 26 (not shown) and covering substantially the entire surface of the first substrate 2 and a gate insulating layer 32 covering the gate bus line 26 A first electrode (pixel electrode) 21 and a second electrode (common electrode) 22 are provided so as to be spaced apart from each other on the insulating protective film 31. The insulating protective layer 31 is a layer having an insulating function and is formed of silicon nitride, silicon dioxide, silicon oxynitride film or the like.

In the embodiment shown in Figs. 5 and 7, the first electrode 21 and the second electrode 22 are comb-like electrodes formed on the insulating protective layer 31, that is, on the same layer, . In the IPS type liquid crystal display part, the interelectrode distance G between the first electrode 21 and the second electrode 22 and the thickness (cell gap) between the first substrate 2 and the second substrate 7, : H satisfies a relation of G? H. The distance G between the electrodes indicates the shortest distance in the horizontal direction to the substrate between the first electrode 21 and the second electrode 22. In the example shown in Figs. 5 and 7, the first electrode 21 And the second electrode 22 are disturbed and represent the distance in the vertical direction with respect to the line formed alternately. The distance H between the first substrate 2 and the second substrate 7 indicates the thickness of the liquid crystal layer between the first substrate 2 and the second substrate 7. Specifically, (The cell gap) between the first substrate 1 and the second substrate 7, and the alignment film 4 (top surface) provided on each of the second substrate 7 and the liquid crystal layer.

On the other hand, in the above-described FFS type liquid crystal display part, the thickness of the liquid crystal layer between the first substrate 2 and the second substrate 7 is set to be between the first electrode 21 and the second electrode 22, The IPS type liquid crystal display part is arranged such that the thickness of the liquid crystal layer between the first substrate 2 and the second substrate 7 is smaller than the shortest distance in the horizontal direction between the first electrode 21 and the second electrode 22 The shortest distance in the horizontal direction on the substrate. Therefore, the difference between the IPS and the FFS does not depend on the positional relationship of the first electrode 21 and the second electrode 22 in the thickness direction.

The IPS liquid crystal display device drives the liquid crystal molecules using an electric field in the horizontal direction with respect to the substrate surface formed between the first electrode 21 and the second electrode 22. [ The electrode width Q of the first electrode 21 and the electrode width R of the second electrode 22 are formed to have such a width that liquid crystal molecules in the liquid crystal layer 5 can all be driven by the generated electric field .

Another preferred embodiment of the present invention is a vertical alignment type liquid crystal display element. 8 is a diagram schematically showing a configuration of a liquid crystal display part of a vertically aligned liquid crystal display element. In Fig. 8, for convenience of description, the components are described separately. 9 is an enlarged plan view of an area surrounded by an II line of an electrode layer 3 (also referred to as a thin film transistor layer 3) including a thin film transistor formed on the substrate in FIG. Fig. 10 is a cross-sectional view of the liquid crystal display element shown in Fig. 1 cut along the line III-III in Fig. Hereinafter, a vertical alignment type liquid crystal display unit according to the present invention will be described with reference to Figs.

The structure of the liquid crystal display element 10 according to the present invention is not limited to the structure of the liquid crystal display element 10 having the transparent electrode (layer) 3 '(or common electrode 3') made of a transparent conductive material as shown in Fig. 8 A first substrate 2 including a second substrate 7 and an electrode layer 3 on which pixel electrodes and thin film transistors for controlling the pixel electrodes of each pixel are formed; (Or liquid crystal layer 5) sandwiched between the second substrate 7 and a liquid crystal display in which the orientation of the liquid crystal molecules in the liquid crystal composition when no voltage is applied is substantially perpendicular to the substrates 2 and 7 And is characterized by using the liquid crystal composition of the present invention as the liquid crystal composition. 8 and 10, the first substrate 2 and the second substrate 7 may be sandwiched by a pair of polarizers 1 and 8. In this case, In Fig. 8, a color filter 6 is provided between the second substrate 7 and the common electrode 3 '. A pair of alignment films 4 adjacent to the liquid crystal layer 5 according to the present invention and in direct contact with the liquid crystal composition constituting the liquid crystal layer 5 are formed on transparent electrodes (layers) 3 and 3 ' It may be formed on the surface.

9 is a plan view showing an inverted L-shaped pixel electrode as an example of the shape of the pixel electrode 21 and an enlarged view of a region surrounded by the II line of the electrode layer 3 formed on the substrate 2 in Fig. to be. Although the pixel electrode 21 is formed in an inverted L-shape on substantially the entire area surrounded by the gate bus line 26 and the source bus line 25 as in FIGS. 3 and 4, the shape of the pixel electrode is limited It is not.

In the liquid crystal display part of the vertically aligned liquid crystal display element, the common electrode 22 (not shown) is formed opposite to the pixel electrode 21, unlike the IPS or FFS type described above. In other words, the pixel electrode 21 and the common electrode 22 are formed on different substrates. On the other hand, in the FFS or IPS type liquid crystal display element described above, the pixel electrode 21 and the common electrode 22 are formed on the same substrate.

It is preferable that the color filter 6 is formed with a black matrix (not shown) at portions corresponding to the thin film transistor and the storage capacitor 23 from the viewpoint of preventing light leakage.

Fig. 10 is a cross-sectional view of the liquid crystal display element shown in Fig. 8 cut along the line III-III in Fig. That is, the liquid crystal display element 10 according to the present invention includes a first polarizer 1, a first substrate 2, an electrode layer (also referred to as a thin film transistor layer) 3 including a thin film transistor, A layer 5 including a liquid crystal composition, an alignment film 4, a common electrode 3 ', a color filter 6, a second substrate 7, and a second polarizing plate 8 are sequentially laminated. A suitable embodiment of the structure (region IV in Fig. 10) of the thin film transistor of the liquid crystal display element according to the present invention is as described above, and therefore will not be described here.

Next, the liquid crystal layer of the liquid crystal display part of the present invention will be described. The liquid crystal layer related to the present invention includes a liquid crystal composition containing one kind or two or more kinds of compounds represented by the general formula (i). The liquid crystal composition is preferably a nematic liquid crystal composition. The liquid crystal composition according to the present invention preferably has a component whose dielectric anisotropy (??) is negative (-2??) And a component whose dielectric anisotropy is neutral (-2??? 2).

Also, the genetically negative compound represented by the general formula (i) (the sign of ?? is negative and its absolute value is larger than 2).

The genetically negative compound of the liquid crystal composition according to the present invention is a structure in which the ring structure in the molecule is composed of 6-membered rings and the difluorobenzene group is essential as in the case of the compound represented by the general formula (i) Condensation ring structure and the like, it is considered that the generation of flicker and the like is alleviated even after long-time backlight irradiation since the initial characteristics can be easily maintained with high reliability against long-time backlight irradiation.

( ^Wherein , R ⁱ¹ and R ⁱ² each independently represent an alkyl group having 1 to 8 carbon atoms, and one or more of the alkyl groups or two or more non-bonded -CH ₂ - s are independently -CH = CH-, - -C≡C-, -O-, -CO-, -COO- or -OCO-, A ⁱ¹ and A ⁱ² each independently represent

(c) 1,4-cyclohexenylene group

Z Z ⁱ¹ and ⁱ² are each independently a single _{bond, -CH 2 CH 2 -, -} (CH 2) 4 -, -OCH 2 -, -CH 2 O-, -COO-, -OCO-, -OCF 2 - , -CF ₂ O-, -CH = NN = CH-, -CH = CH-, -CF = CF- or -C≡C-,

n ⁱ¹ and n ⁱ² each independently represent an integer of 0 to 3, where n ⁱ¹ + n ⁱ² is 1, 2 or 3, and when a plurality of A ⁱ¹ to A ⁱ² and Z ⁱ¹ to Z ⁱ² exist, they are the same May be different or different.)

When the liquid crystal composition according to the present invention contains the condensed cyclic compound, flicker can be easily recognized because the reduction in the voltage holding ratio at the time of low-frequency driving is large when long-time backlight irradiation is performed.

It is preferable that the compound represented by the general formula (i) is a compound wherein? Is negative and the absolute value thereof is greater than 3.

In the general formula (i), R ⁱ¹ and R ⁱ² each independently represent an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, An alkenyloxy group of 1 to 5 carbon atoms, an alkoxy group of 1 to 5 carbon atoms, an alkenyl group of 2 to 5 carbon atoms, or an alkenyloxy group of 2 to 5 carbon atoms, desirable.

When the ring structure to which R ⁱ¹ and R ⁱ² are bonded is a phenyl group (aromatic), an alkyl group having 1 to 5 carbon atoms in a straight chain, an alkoxy group having 1 to 4 carbon atoms in a straight chain, and an alkoxy group having 4 to 4 carbon atoms An alkenyl group of 5 to 5 carbon atoms is preferable and when the ring structure to which R ⁱ¹ and R ⁱ² are bonded is a saturated ring structure such as cyclohexane, pyran and dioxane, an alkyl group having 1 to 5 carbon atoms, An alkoxy group having 1 to 4 carbon atoms in the chain and an alkenyl group having 2 to 5 carbon atoms in the straight chain are preferable. In order to stabilize the nematic phase, the sum of the carbon atoms and oxygen atoms, if any, is preferably 5 or less, and is preferably straight-chain.

The alkenyl group is preferably selected from groups represented by any one of formulas (R1) to (R5). (In the formula, the black point represents a carbon atom in the ring structure.)

A ⁱ¹ and A ⁱ² are preferably an aromatic group when it is required to increase Δn independently of each other, and an aliphatic group is preferable for improving the response speed, and trans-1,4-cyclohexylene group, 1,4 Phenylene group, 3-fluoro-1,4-phenylene group, 3,5-difluoro-1,4-phenylene group, 2,3-difluoro -1,4-phenylene group, 1,4-cyclohexenylene group and piperidine-1,4-diyl group, more preferably represents the following structure,

A trans-1,4-cyclohexylene group, a 1,4-cyclohexenylene group or a 1,4-phenylene group.

Z ⁱ¹ and Z ⁱ² each independently represent -CH ₂ O-, -CF ₂ O-, -CH ₂ CH ₂ -, -CF ₂ CF ₂ - or a single bond, and -CH ₂ O-, CH ₂ CH ₂ - or a single bond is more preferable, and -CH ₂ O- or a single bond is particularly preferable.

a combination of n ⁱ¹ + n ⁱ² is preferably 1 or 2, n ⁱ¹ is 1 and n ⁱ² is 0, n ⁱ¹ is 2 and n ⁱ² is 0, n ⁱ¹ is 1 and n ⁱ² is 1, n ^a combination in which ⁱ¹ is 2 and ⁿⁱ² is 1 is preferable.

The lower limit of the preferable content of the compound represented by the formula (i) relative to the total amount of the composition of the present invention is 1%, 10%, 20%, 30%, 40%, 50%, 55% , 60%, 65%, 70%, 75%, 80%. The upper limit of the preferred content is 95%, 90%, 85%, 80%, 79%, 75%, 65%, 55%, 45%, 35%, 25% 20%.

Particularly preferred compounds as the compounds represented by the general formula (i) include the compounds represented by the following general formulas (N-1a) to (N-1f). The compound represented by the general formula (i) related to the present invention is preferably one or more compounds selected from the group consisting of the compounds represented by the general formulas (N-1a) to (N-1f).

( ^Wherein R ^N11 and R ^N12 have the same meanings as R ^N11 and R ^N12 in the general formula (i), n ^Na11 represents 0 or 1, n ^Nb11 represents 0 or 1, and n ^Nc11 represents represents 0 or 1, n ^Nd11 is 1 or 2 a represents, n ^Ne11 is 1 or 2 a represents, n ^Nf11 represents 0 or 1, n ^Nf12 is to represent 0 or 1, n ^Nf11 + n ^Nf12 is 1 or 2).

When the viscosity of the composition of the present invention is kept low and a composition with a high response speed is required, it is preferable that the lower limit is lower and the upper limit is lower. When a composition having a high temperature stability is required by maintaining the T _NI of the composition of the present invention at a high level, it is preferable that the above lower limit value is low and the upper limit value is low. When it is desired to increase the dielectric anisotropy so as to keep the driving voltage low, it is preferable that the lower limit is higher and the upper limit is higher.

More specifically, it is preferable that the compound represented by the general formula (i) is a compound selected from the group of compounds represented by the following general formulas (N-1-1) to (N-1-21).

The compound represented by the general formula (N-1-1) is the following compound.

( ^Wherein R ^N111 and R ^N112 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N)).

R ^N111 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and a propyl group or a pentyl group is preferable. R ^N112 is preferably an alkyl group of 1 to 5 carbon atoms, an alkenyl group of 4 to 5 carbon atoms, or an alkoxy group of 1 to 4 carbon atoms, with ethoxy or butoxy being preferred.

The compound represented by formula (N-1-1) may be used alone, but two or more compounds may be used in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound used is, for example, one kind of the present invention, two kinds, three kinds, four kinds, and five or more kinds.

If when an emphasis on the improvement of Δε in the case of preferable to set the content of a little high, when an emphasis on solubility at a low temperature is by setting a lot some content a high effect, emphasis on T _NI is set to be smaller a little content The effect is high. Further, in the case of improving the droplet tracing or baking characteristics, it is preferable to set the range of the content to a medium value.

The lower limit of the preferable content of the compound represented by the formula (N-1-1) based on the total amount of the composition of the present invention is 5%, 10%, 13%, 15%, 17%, 20% , 23%, 25%, 27%, 30%, 33%, and 35%, respectively. The upper limit of the preferred content is 50%, 40%, 38%, 35%, 33%, 30%, 28%, 25%, and 23% based on the total amount of the composition of the present invention , 20%, 18%, 15%, 13%, 10%, 8%, 7%, 6%, 5%, 3%.

The compound represented by the general formula (N-1-1) is preferably a compound selected from the group of compounds represented by the formulas (N-1-1.1) to (N-1-1.14) N-1-1.1) to (N-1-1.4), and the compounds represented by formulas (N-1-1.1) and (N-1-1.3) are preferable.

The compounds represented by the formulas (N-1-1.1) to (N-1-1.4) may be used alone or in combination. The compounds represented by the formulas (N-1-1.1) The lower limit is 5%, 10%, 13%, 15%, 17%, 20%, 23%, 25%, 27%, 30%, 33%, 35% . The upper limit of the preferred content is 50%, 40%, 38%, 35%, 33%, 30%, 28%, 25%, and 23% based on the total amount of the composition of the present invention , 20%, 18%, 15%, 13%, 10%, 8%, 7%, 6%, 5%, 3%.

The compound represented by the general formula (N-1-2) is the following compound.

( ^Wherein R ^N121 and R ^N122 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N)).

R ^N121 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and is preferably an ethyl group, a propyl group, a butyl group or a pentyl group. R ^N122 is preferably an alkyl group of 1 to 5 carbon atoms, an alkenyl group of 4 to 5 carbon atoms, or an alkoxy group of 1 to 4 carbon atoms, and is preferably a methyl group, a propyl group, a methoxy group, an ethoxy group or a propoxy group .

The compound represented by the formula (N-1-2) may be used alone, but two or more compounds may be used in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound used is, for example, one kind of the present invention, two kinds, three kinds, four kinds, and five or more kinds.

If when an emphasis on the improvement of Δε is preferable to set the content of a little high, when an emphasis on solubility at a low temperature when set to be smaller a little content of a high effect, are a lot some content case that values T _NI set The effect is high. In addition, in the case of improving the droplet trail or the baking property, it is preferable to set the range of the content to a medium value.

The lower limit of the preferable content of the compound represented by the formula (N-1-2) based on the total amount of the composition of the present invention is 5%, 7%, 10%, 13%, 15%, 17% , 20%, 23%, 25%, 27%, 30%, 33%, 35%, 37%, 40%, and 42%. The upper limit of the preferred content is 50%, 48%, 45%, 43%, 40%, 38%, 35%, 33% and 30% based on the total amount of the composition of the present invention , 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%, 8%, 7%, 6%, 5%.

The compound represented by the general formula (N-1-2) is preferably a compound selected from the group of compounds represented by the formulas (N-1-2.1) to (N-1-2.13) (N-1-2.3) to (N-1-2.7), (N-1-2.10), (N-1-2.11) , in the case of when an emphasis on improvement of Δε, the compound represented by the formula (N-1-2.3)) to ((N-1-2.7) are preferred, and an emphasis on improvement of the T _NI in formula (N-1-2.10 ), The formula (N-1-2.11) and the formula (N-1-2.13).

The compounds represented by the formulas (N-1-2.1) to (N-1-2.13) may be used alone or in combination. The compound represented by the formula (N-1-2.1) The lower limit value of 5% is 10%, 13%, 15%, 17%, 20%, 23%, 25%, 27%, 30%, 33%, 35% to be. The upper limit of the preferred content is 50%, 40%, 38%, 35%, 33%, 30%, 28%, 25%, and 23% based on the total amount of the composition of the present invention , 20%, 18%, 15%, 13%, 10%, 8%, 7%, 6%, 5%, 3%.

The compound represented by the general formula (N-1-3) is the following compound.

( ^Wherein R ^N131 and R ^N132 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N)).

R ^N131 is preferably an alkyl group of 1 to 5 carbon atoms or an alkenyl group of 2 to 5 carbon atoms, preferably an ethyl group, a propyl group or a butyl group. R ^N132 is preferably an alkyl group of 1 to 5 carbon atoms, an alkenyl group of 4 to 5 carbon atoms, or an alkoxy group of 1 to 4 carbon atoms, with ethoxy, propoxy or butoxy being preferred.

The compound represented by the general formula (N-1-3) may be used alone, but two or more compounds may be used in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound used is, for example, one kind of the present invention, two kinds, three kinds, four kinds, and five or more kinds.

If when an emphasis on the improvement of Δε is preferable to set the content of a little high, when an emphasis on solubility at a low temperature is by setting a lot some content high in effect, is a lot some content case that values T _NI set The effect is high. In addition, in the case of improving the droplet trail or the baking property, it is preferable to set the range of the content to a medium value.

The lower limit of the preferable content of the compound represented by the formula (N-1-3) relative to the total amount of the composition of the present invention is 5%, 10%, 13%, 15%, 17%, 20% . The upper limit of the preferred content is 35%, 30%, 28%, 25%, 23%, 20%, 18%, 15% and 13% based on the total amount of the composition of the present invention .

The compound represented by the general formula (N-1-3) is preferably a compound selected from the group of compounds represented by the formulas (N-1-3.1) to (N-1-3.11) (N-1-3.1), (N-1-3.2), (N-1-3.3), The compounds represented by formulas (N-1-3.4) and (N-1-3.6) are preferred.

The compounds represented by the formulas (N-1-3.1) to (N-1-3.4) and (N-1-3.6) can be used alone or in combination, A combination of two or three kinds selected from the combination of the formula (N-1-3), the formula (N-1-3.2), the formula (N-1-3.3) . The lower limit of the total amount of the composition of the present invention or the preferable content of these compounds is 5%, 10%, 13%, 15%, 17% and 20%. The upper limit of the preferred content is 35%, 30%, 28%, 25%, 23%, 20%, 18%, 15% and 13% based on the total amount of the composition of the present invention .

The compound represented by the general formula (N-1-4) is the following compound.

( ^Wherein R ^N141 and R ^N142 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N)).

R ^N141 and R ^N142 each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and preferably a methyl group, a propyl group, The timing is preferable.

The compound represented by the general formula (N-1-4) may be used alone, but two or more compounds may be used in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound used is, for example, one kind of the present invention, two kinds, three kinds, four kinds, and five or more kinds.

If when an emphasis on the improvement of Δε in the case of preferable to set the content of a little high, when an emphasis on solubility at a low temperature is by setting a lot some content a high effect, emphasis on T _NI is set to be smaller a little content The effect is high. In addition, in the case of improving the droplet trail or the baking property, it is preferable to set the range of the content to a medium value.

The lower limit of the preferable content of the compound represented by the formula (N-1-4) relative to the total amount of the composition of the present invention is 3%, 5%, 7%, 10%, 13%, 15% , 17%, and 20%, respectively. The upper limit of the preferred content is 35%, 30%, 28%, 25%, 23%, 20%, 18%, 15% and 13% based on the total amount of the composition of the present invention , 11%, 10%, 8%.

The compound represented by the general formula (N-1-4) is preferably a compound selected from the group of compounds represented by the formulas (N-1-4.1) to (N-1-4.14) N-1-4.1) to (N-1-4.4), and the compounds represented by formulas (N-1-4.1) and (N-1-4.2) are preferred.

The compounds represented by the formulas (N-1-4.1) to (N-1-4.4) may be used alone or in combination. The compounds represented by the formulas (N-1-4.1) The lower limit is 3%, 5%, 7%, 10%, 13%, 15%, 17% and 20%. The upper limit of the preferred content is 35%, 30%, 28%, 25%, 23%, 20%, 18%, 15% and 13% based on the total amount of the composition of the present invention , 11%, 10%, 8%.

The compound represented by the general formula (N-1-5) is the following compound.

( ^Wherein R ^N151 and R ^N152 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N)).

Each of R ^N151 and R ^N152 is preferably an alkyl group of 1 to 5 carbon atoms, an alkenyl group of 4 to 5 carbon atoms, or an alkoxy group of 1 to 4 carbon atoms, and is preferably an ethyl group, a propyl group or a butyl group .

The compound represented by formula (N-1-5) may be used alone, but two or more compounds may be used in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound used is, for example, one kind of the present invention, two kinds, three kinds, four kinds, and five or more kinds.

The lower limit of the preferable content of the compound represented by the formula (N-1-5) relative to the total amount of the composition of the present invention is 5%, 8%, 10%, 13%, 15%, 17% , And 20%, respectively. The upper limit of the preferred content is 35%, 33%, 30%, 28%, 25%, 23%, 20%, 18%, 15% based on the total amount of the composition of the present invention , And 13%, respectively.

The compound represented by the general formula (N-1-5) is preferably a compound selected from the group of compounds represented by the formulas (N-1-5.1) to (N-1-5.6) N-1-3.2) and a compound represented by the formula (N-1-3.4) are preferable.

The compounds represented by the formulas (N-1-3.2) and (N-1-3.4) may be used alone or in combination, but they may be used alone or in combination with the preferred contents of these compounds The lower limit value of 5% is 8%, which is 10%, 13%, 15%, 17% and 20%. The upper limit of the preferred content is 35%, 33%, 30%, 28%, 25%, 23%, 20%, 18%, 15% based on the total amount of the composition of the present invention , And 13%, respectively.

The compound represented by the general formula (N-1-10) is the following compound.

( ^Wherein R ^N1101 and R ^N1102 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N)).

R ^N1101 is preferably an alkyl group of 1 to 5 carbon atoms or an alkenyl group of 2 to 5 carbon atoms, preferably an ethyl group, a propyl group or a butyl group. R ^N1102 is preferably an alkyl group of 1 to 5 carbon atoms, an alkenyl group of 4 to 5 carbon atoms, or an alkoxy group of 1 to 4 carbon atoms, with ethoxy, propoxy or butoxy being preferred.

The compound represented by the general formula (N-1-10) may be used alone, but two or more compounds may be used in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound used is, for example, one kind of the present invention, two kinds, three kinds, four kinds, and five or more kinds.

The lower limit of the preferred content of the compound represented by the formula (N-1-10) relative to the total amount of the composition of the present invention is 5%, 10%, 13%, 15%, 17%, 20% . The upper limit of the preferred content is 35%, 30%, 28%, 25%, 23%, 20%, 18%, 15% and 13% based on the total amount of the composition of the present invention .

The compound represented by the general formula (N-1-10) is preferably a compound selected from the group of compounds represented by the formulas (N-1-10.1) to (N-1-10.11) N-1-10.1) to (N-1-10.5), and the compounds represented by formulas (N-1-10.1) and (N-1-10.2) are preferred.

The compounds represented by the formulas (N-1-10.1) and (N-1-10.2) may be used alone or in combination, but may be used alone or in combination with the The lower limit of the content is 5%, which is 10%, 13%, 15%, 17%, and 20%. The upper limit of the preferred content is 35%, 30%, 28%, 25%, 23%, 20%, 18%, 15% and 13% based on the total amount of the composition of the present invention .

The compound represented by the general formula (N-1-11) is the following compound.

( ^Wherein R ^N1111 and R ^N1112 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N)).

R ^N1111 is preferably an alkyl group of 1 to 5 carbon atoms or an alkenyl group of 2 to 5 carbon atoms, preferably an ethyl group, a propyl group or a butyl group. R ^N1112 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, with ethoxy, propoxy or butoxy being preferred.

The compound represented by formula (N-1-11) may be used alone, but two or more compounds may be used in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound used is, for example, one kind of the present invention, two kinds, three kinds, four kinds, and five or more kinds.

The lower limit of the preferable content of the compound represented by the formula (N-1-11) relative to the total amount of the composition of the present invention is 5%, 10%, 13%, 15%, 17%, 20% . The upper limit of the preferred content is 35%, 30%, 28%, 25%, 23%, 20%, 18%, 15% and 13% based on the total amount of the composition of the present invention .

The compound represented by the general formula (N-1-11) is preferably a compound selected from the group of compounds represented by the formulas (N-1-11.1) to (N-1-11.15) N-1-11.1) to (N-1-11.15), and the compounds represented by formulas (N-1-11.2) and (N-1-11.4) are preferable.

The compounds represented by the formulas (N-1-11.2) and (N-1-11.4) may be used alone or in combination. The compounds represented by the formulas (N-1-11.2) The lower limit value of 5% is 10%, which is 13%, 15%, 17%, and 20%. The upper limit of the preferred content is 35%, 30%, 28%, 25%, 23%, 20%, 18%, 15% and 13% based on the total amount of the composition of the present invention .

The compound represented by the general formula (N-1-12) is the following compound.

( ^Wherein R ^N1121 and R ^N1122 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N)).

R ^N1121 is preferably an alkyl group of 1 to 5 carbon atoms or an alkenyl group of 2 to 5 carbon atoms, preferably an ethyl group, a propyl group or a butyl group. R ^N1122 is preferably an alkyl group of 1 to 5 carbon atoms, an alkenyl group of 4 to 5 carbon atoms, or an alkoxy group of 1 to 4 carbon atoms, with ethoxy, propoxy or butoxy being preferred.

The compound represented by the general formula (N-1-12) may be used alone, but two or more compounds may be used in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound used is, for example, one kind of the present invention, two kinds, three kinds, four kinds, and five or more kinds.

The lower limit of the preferable content of the compound represented by the formula (N-1-12) relative to the total amount of the composition of the present invention is 5%, 10%, 13%, 15%, 17%, 20% . The upper limit of the preferred content is 35%, 30%, 28%, 25%, 23%, 20%, 18%, 15% and 13% based on the total amount of the composition of the present invention .

The compound represented by the general formula (N-1-13) is the following compound.

( ^Wherein R ^N1131 and R ^N1132 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N)).

R ^N1131 is preferably an alkyl group of 1 to 5 carbon atoms or an alkenyl group of 2 to 5 carbon atoms, and is preferably an ethyl group, a propyl group or a butyl group. R ^N1132 is preferably an alkyl group of 1 to 5 carbon atoms, an alkenyl group of 4 to 5 carbon atoms, or an alkoxy group of 1 to 4 carbon atoms, with ethoxy, propoxy or butoxy being preferred.

The compound represented by the general formula (N-1-13) may be used alone, but two or more compounds may be used in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound used is, for example, one kind of the present invention, two kinds, three kinds, four kinds, and five or more kinds.

The lower limit of the preferable content of the compound represented by the formula (N-1-13) relative to the total amount of the composition of the present invention is 5%, 10%, 13%, 15%, 17%, 20% . The upper limit of the preferred content is 35%, 30%, 28%, 25%, 23%, 20%, 18%, 15% and 13% based on the total amount of the composition of the present invention .

The compound represented by the general formula (N-1-14) is the following compound.

( ^Wherein R ^N1141 and R ^N1142 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N)).

R ^N1141 is preferably an alkyl group of 1 to 5 carbon atoms or an alkenyl group of 2 to 5 carbon atoms, preferably an ethyl group, a propyl group or a butyl group. R ^N1142 is preferably an alkyl group of 1 to 5 carbon atoms, an alkenyl group of 4 to 5 carbon atoms, or an alkoxy group of 1 to 4 carbon atoms, with ethoxy, propoxy or butoxy being preferred.

The compound represented by the general formula (N-1-14) may be used alone, but two or more compounds may be used in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound used is, for example, one kind of the present invention, two kinds, three kinds, four kinds, and five or more kinds.

The lower limit of the preferable content of the compound represented by the formula (N-1-14) relative to the total amount of the composition of the present invention is 5%, 10%, 13%, 15%, 17%, 20% . The upper limit of the preferred content is 35%, 30%, 28%, 25%, 23%, 20%, 18%, 15% and 13% based on the total amount of the composition of the present invention .

The compound represented by the general formula (N-1-15) is the following compound.

( ^Wherein R ^N1151 and R ^N1152 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N)).

R ^N1151 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and is preferably an ethyl group, a propyl group or a butyl group. R ^N1152 is preferably an alkyl group of 1 to 5 carbon atoms, an alkenyl group of 4 to 5 carbon atoms, or an alkoxy group of 1 to 4 carbon atoms, with ethoxy, propoxy or butoxy being preferred.

The compound represented by the general formula (N-1-15) may be used alone, but two or more compounds may be used in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound used is, for example, one kind of the present invention, two kinds, three kinds, four kinds, and five or more kinds.

The lower limit of the preferable content of the compound represented by the formula (N-1-15) to the total amount of the composition of the present invention is 5%, 10%, 13%, 15%, 17%, 20% . The upper limit of the preferred content is 35%, 30%, 28%, 25%, 23%, 20%, 18%, 15% and 13% based on the total amount of the composition of the present invention .

The compound represented by the general formula (N-1-16) is the following compound.

(Wherein, R and R ^N1161 ^N1162 are, each independently, represent the R ^N11 and R ^N12 as defined in the formula (N).)

R ^N1161 is preferably an alkyl group of 1 to 5 carbon atoms or an alkenyl group of 2 to 5 carbon atoms, preferably an ethyl group, a propyl group or a butyl group. R ^N1162 is preferably an alkyl group of 1 to 5 carbon atoms, an alkenyl group of 4 to 5 carbon atoms, or an alkoxy group of 1 to 4 carbon atoms, with ethoxy, propoxy or butoxy being preferred.

The compound represented by the general formula (N-1-16) may be used alone, but two or more compounds may be used in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound used is, for example, one kind of the present invention, two kinds, three kinds, four kinds, and five or more kinds.

The lower limit of the preferable content of the compound represented by the formula (N-1-16) relative to the total amount of the composition of the present invention is 5%, 10%, 13%, 15%, 17%, 20% . The upper limit of the preferred content is 35%, 30%, 28%, 25%, 23%, 20%, 18%, 15% and 13% based on the total amount of the composition of the present invention .

The compound represented by the general formula (N-1-17) is the following compound.

( ^Wherein R ^N1171 and R ^N1172 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N)).

R ^N1171 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and is preferably an ethyl group, a propyl group or a butyl group. R ^N1172 is preferably an alkyl group of 1 to 5 carbon atoms, an alkenyl group of 4 to 5 carbon atoms, or an alkoxy group of 1 to 4 carbon atoms, with ethoxy, propoxy or butoxy being preferred.

The compound represented by the general formula (N-1-17) may be used alone, but two or more compounds may be used in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound used is, for example, one kind of the present invention, two kinds, three kinds, four kinds, and five or more kinds.

The lower limit of the preferable content of the compound represented by the formula (N-1-17) relative to the total amount of the composition of the present invention is 5%, 10%, 13%, 15%, 17%, 20% . The upper limit of the preferred content is 35%, 30%, 28%, 25%, 23%, 20%, 18%, 15% and 13% based on the total amount of the composition of the present invention .

The compound represented by the general formula (N-1-18) is the following compound.

( ^Wherein R ^N1181 and R ^N1182 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N)).

R ^N1181 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and is preferably an ethyl group, a propyl group or a butyl group. R ^N1182 is preferably an alkyl group of 1 to 5 carbon atoms, an alkenyl group of 4 to 5 carbon atoms, or an alkoxy group of 1 to 4 carbon atoms, with ethoxy, propoxy or butoxy being preferred.

The compound represented by the general formula (N-1-18) may be used alone, but two or more compounds may be used in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound used is, for example, one kind of the present invention, two kinds, three kinds, four kinds, and five or more kinds.

The lower limit of the preferable content of the compound represented by the formula (N-1-18) relative to the total amount of the composition of the present invention is 5%, 10%, 13%, 15%, 17%, 20% . The upper limit of the preferred content is 35%, 30%, 28%, 25%, 23%, 20%, 18%, 15% and 13% based on the total amount of the composition of the present invention .

The compound represented by the general formula (N-1-20) is the following compound.

( ^Wherein R ^N1201 and R ^N1202 each independently represent the same meaning as R ⁱ¹ and R ⁱ² in formula (i)).

Each of R ^N1201 and R ^N1202 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and is preferably an ethyl group, a propyl group or a butyl group.

The compound represented by the general formula (N-1-20) may be used alone, but two or more compounds may be used in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound used is, for example, one kind of the present invention, two kinds, three kinds, four kinds, and five or more kinds.

The lower limit of the preferable content of the compound represented by the formula (N-1-20) to the total amount of the composition of the present invention is 5%, 10%, 13%, 15%, 17%, 20% . The upper limit of the preferred content is 35%, 30%, 28%, 25%, 23%, 20%, 18%, 15% and 13% based on the total amount of the composition of the present invention .

The compound represented by the general formula (N-1-21) is the following compound.

( ^Wherein R ^N1211 and R ^N1212 each independently represent the same meaning as R ⁱ¹ and R ⁱ² in formula (i)).

Each of R ^N1211 and R ^N1212 is preferably an alkyl group of 1 to 5 carbon atoms or an alkenyl group of 2 to 5 carbon atoms, and is preferably an ethyl group, a propyl group or a butyl group.

The compound represented by the general formula (N-1-21) may be used alone, but two or more compounds may be used in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound used is, for example, one kind of the present invention, two kinds, three kinds, four kinds, and five or more kinds.

The lower limit of the preferable content of the compound represented by the formula (N-1-21) relative to the total amount of the composition of the present invention is 5%, 10%, 13%, 15%, 17%, 20% . The upper limit of the preferred content is 35%, 30%, 28%, 25%, 23%, 20%, 18%, 15% and 13% based on the total amount of the composition of the present invention .

The composition of the present invention preferably contains one kind or two or more kinds of compounds represented by the general formula (L). The compound represented by the general formula (L) corresponds to a genetically almost neutral compound (the value of ?? is -2 to 2).

(Wherein R ^L1 and R ^L2 each independently represent an alkyl group having 1 to 8 carbon atoms, and one or more of the alkyl groups or two or more non-bonded -CH ₂ - groups are each independently -CH = CH-, - -C≡C-, -O-, -CO-, -COO- or -OCO-,

n ^L1 represents 0, 1, 2 or 3,

A ^L1 , A ^L2 and A ^L3 are each independently

(A) and (b) each independently represent a group selected from the group consisting of a cyano group, a fluorine atom and a chlorine atom,

Z Z ^L1 and ^L2 represents a single bond, each _{independently, -CH 2 CH 2 -, -} (CH 2) 4 -, -OCH 2 -, -CH 2 O-, -COO-, -OCO-, -OCF 2 - , -CF ₂ O-, -CH = NN = CH-, -CH = CH-, -CF = CF- or -C≡C-,

When n ^L1 is 2 or 3 and a plurality of A ^L2 is present, they may be the same or different. When n ^L1 is 2 or 3 and plural Z ^L3 are present, they may be the same or different. (i) are excluded).

The compounds represented by the general formula (L) may be used alone or in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to desired performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The kind of compound to be used is, for example, one kind according to one embodiment of the present invention. In another embodiment of the present invention, there are two kinds, three kinds, four kinds, five kinds, six kinds, seven kinds, eight kinds, nine kinds, ten kinds or more.

In the composition of the present invention, the content of the compound represented by the general formula (L) is preferably in the range of from 0.1 to 10 parts by weight, more preferably from 0.1 to 10 parts by weight, per 100 parts by weight, It is necessary to adjust it appropriately.

The lower limit of the preferable content of the compound represented by the formula (L) to the total amount of the composition of the present invention is 1%, 10%, 20%, 30%, 40%, 50%, 55% , 60%, 65%, 70%, 75%, 80%. The upper limit of the preferred content is 95%, 85%, 75%, 65%, 55%, 45%, 35% and 25%.

When the viscosity of the composition of the present invention is kept low and a composition having a high response speed is required, it is preferable that the lower limit is higher and the upper limit is higher. When a composition having a high temperature stability is required by maintaining the T _NI of the composition of the present invention at a high level, it is preferable that the above lower limit is high and the upper limit is high. When it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable that the lower limit is lower and the upper limit is lower.

When reliability is emphasized, it is preferable that all of R ^L1 and R ^L2 are alkyl groups, and when decreasing the volatility of the compound is emphasized, it is preferably an alkoxy group, and when decreasing viscosity is emphasized, at least one of R ^L1 and R ^L2 is an alkenyl group .

The halogen atom present in the molecule is preferably 0, 1, 2 or 3, preferably 0 or 1, and preferably 1 when compatibility with other liquid crystal molecules is important.

R ^L1 and R ^{L2 each} represent a straight chain alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 4 carbon atoms in the linear chain, and an alkoxy group having 4 carbon atoms An alkenyl group having a carbon number of 1 to 5 is preferable, and when the ring structure to which it is bonded is a saturated ring structure such as cyclohexane, pyran and dioxane, a straight chain alkyl group having 1 to 5 carbon atoms, An alkoxy group having 1 to 4 carbon atoms and an alkenyl group having 2 to 5 carbon atoms linear are preferable. In order to stabilize the nematic phase, the sum of the carbon atoms and oxygen atoms, if any, is preferably 5 or less, and is preferably straight-chain.

n ^L1 is preferably 0 in the case of emphasizing the response speed, and 2 or 3 is preferable in order to improve the upper limit temperature of the nematic phase, and 1 is preferable in order to balance these. Further, it is preferable to combine compounds having different values in order to satisfy the properties required as the composition.

A ^L1 , A ^L2 and A ^L3 are preferably aromatic when it is required to increase Δn and are preferably aliphatic in order to improve the response speed and are each independently trans-1,4-cyclohexylene group, 1,4-phenylene group, 3-fluoro-1,4-phenylene group, 3,5-difluoro-1,4-phenylene group, 1,4- Cyclohexenylene group, piperidine-1,4-diyl group, more preferably represents the following structure,

A trans-1,4-cyclohexylene group or a 1,4-phenylene group.

It is preferable that Z ^L1 and Z ^{L2 be} single coupled when the response speed is important.

It is preferable that the compound represented by the general formula (L) has 0 or 1 halogen atoms in the molecule.

The compound represented by the general formula (L) related to the present invention is preferably one or more compounds selected from the group of compounds represented by the general formulas (L-1) to (L-7).

The compound represented by the above general formula (L-1) is the following compound.

( ^Wherein R ^L11 and R ^L12 each independently represent the same meaning as R ^L1 and R ^L2 in formula (L)).

R ^L11 and R ^L12 are preferably straight-chain alkyl groups having 1 to 5 carbon atoms, straight-chain alkoxy groups having 1 to 4 carbon atoms, and straight-chain alkenyl groups having 2 to 5 carbon atoms.

The compound represented by the general formula (L-1) may be used alone, but two or more compounds may be used in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound used is, for example, one kind of the present invention, two kinds, three kinds, four kinds, and five or more kinds.

The lower limit of the preferred content is 1%, 2%, 3%, 5%, 7%, 10%, 15%, 20% and 25% based on the total amount of the composition of the present invention , 30%, 35%, 40%, 45%, 50%, 55%. The upper limit of the preferred content is 95%, 90%, 85%, 80%, 75%, 70%, 65%, 60% and 55% based on the total amount of the composition of the present invention , 50%, 45%, 40%, 35%, 30%, 25%.

When the viscosity of the composition of the present invention is kept low and a composition having a high response speed is required, it is preferable that the lower limit is higher and the upper limit is higher. When the composition of the present invention is maintained at a high T _NI and a composition having good temperature stability is required, it is preferable that the above lower limit is moderate and the upper limit is moderate. When it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable that the lower limit is lower and the upper limit is lower.

The compound represented by formula (L-1) is preferably a compound selected from the group of compounds represented by formula (L-1-1).

( ^Wherein R ^L12 has the same meaning as in formula (L-1)).

The compound represented by the general formula (L-1-1) is preferably a compound selected from the group of compounds represented by the formulas (L-1-1.1) to (L-1-1.3) Is preferably a compound represented by the formula (L-1-1.2) or (L-1-1.3), particularly preferably a compound represented by the formula (L-1-1.3).

The lower limit of the preferable content of the compound represented by the formula (L-1-1.3) with respect to the total amount of the composition of the present invention is 1%, 2%, 3%, 5%, 7%, 10% . The upper limit of the preferred content is 20%, 15%, 13%, 10%, 8%, 7%, 6%, 5% and 3% based on the total amount of the composition of the present invention .

The compound represented by formula (L-1) is preferably a compound selected from the group of compounds represented by formula (L-1-2).

( ^Wherein R ^L12 has the same meaning as in formula (L-1)).

The lower limit of the preferable content of the compound represented by the formula (L-1-2) to the total amount of the composition of the present invention is 1%, 5%, 10%, 15%, 17%, 20% , 23%, 25%, 27%, 30%, and 35%, respectively. The upper limit of the preferred content is 60%, 55%, 50%, 45%, 42%, 40%, 38%, 35%, and 33% based on the total amount of the composition of the present invention , And 30%, respectively.

The compound represented by the general formula (L-1-2) is preferably a compound selected from the group of compounds represented by the formulas (L-1-2.1) to (L-1-2.4) L-1-2.2) to (L-1-2.4). In particular, the compound represented by the formula (L-1-2.2) is preferable because it particularly improves the response speed of the composition of the present invention. When T _NI higher than the response speed is required, it is preferable to use a compound represented by the formula (L-1-2.3) or (L-1-2.4). It is not preferable that the content of the compound represented by the formula (L-1-2.3) and the formula (L-1-2.4) be 30% or more in order to improve the solubility at low temperatures.

The lower limit of the preferable content of the compound represented by the formula (L-1-2.2) to the total amount of the composition of the present invention is 10%, 15%, 18%, 20%, 23%, 25% , 27%, 30%, 33%, 35%, 38%, and 40%, respectively. The upper limit of the preferred content is 60%, 55%, 50%, 45%, 43%, 40%, 38%, 35%, and 32% based on the total amount of the composition of the present invention , 30%, 27%, 25%, and 22%, respectively.

The lower limit of the total preferable content of the compound represented by the formula (L-1-1.3) and the compound represented by the formula (L-1-2.2) with respect to the total amount of the composition of the present invention is 10% and 15% 20%, 25%, 27%, 30%, 35%, 40%. The upper limit of the preferred content is 60%, 55%, 50%, 45%, 43%, 40%, 38%, 35%, and 32% based on the total amount of the composition of the present invention , 30%, 27%, 25%, and 22%, respectively.

The compound represented by formula (L-1) is preferably a compound selected from the group of compounds represented by formula (L-1-3).

( ^Wherein R ^L13 and R ^L14 each independently represent an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms)

R ^L13 and R ^L14 are preferably straight-chain alkyl groups having 1 to 5 carbon atoms, straight-chain alkoxy groups having 1 to 4 carbon atoms, and straight-chain alkenyl groups having 2 to 5 carbon atoms.

The lower limit of the preferable content of the compound represented by the formula (L-1-3) to the total amount of the composition of the present invention is 1%, 5%, 10%, 13%, 15%, 17% , 20%, 23%, 25%, and 30%, respectively. The upper limit of the preferred content is 60%, 55%, 50%, 45%, 40%, 37%, 35%, 33% and 30% based on the total amount of the composition of the present invention , 27%, 25%, 23%, 20%, 17%, 15%, 13%, and 10%.

The compound represented by the general formula (L-1-3) is preferably a compound selected from the group of compounds represented by the formulas (L-1-3.1) to (L-1-3.12) (L-1-3.1), formula (L-1-3.3) or formula (L-1-3.4). In particular, the compound represented by the formula (L-1-3.1) is preferable because it particularly improves the response speed of the composition of the present invention. Further, when T _NI higher than the response speed is required, it is preferable to use the equation (L-1-3.3), L-1-3.4, L-1-3.11 and L- It is preferable to use a compound. The total content of the compounds represented by the formula (L-1-3.3), the formula (L-1-3.4), the formula (L-1-3.11) and the formula (L-1-3.12) It is not preferable to set the ratio to 20% or more.

The lower limit of the preferable content of the compound represented by the formula (L-1-3.1) with respect to the total amount of the composition of the present invention is 1%, 2%, 3%, 5%, 7%, 10% , 13%, 15%, 18%, 20%. The upper limit of the preferable content is 20%, 17%, 15%, 13%, 10%, 8%, 7%, and 6% based on the total amount of the composition of the present invention.

The compound represented by formula (L-1) is preferably a compound selected from the group of compounds represented by formula (L-1-4) and / or (L-1-5).

( ^Wherein R ^L15 and R ^L16 each independently represent an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms)

R ^L15 and R ^L16 are preferably straight-chain alkyl groups having 1 to 5 carbon atoms, straight-chain alkoxy groups having 1 to 4 carbon atoms, and straight-chain alkenyl groups having 2 to 5 carbon atoms.

The lower limit of the preferable content of the compound represented by the formula (L-1-4) to the total amount of the composition of the present invention is 1%, 5%, 10%, 13%, 15%, 17% , And 20%, respectively. The upper limit of the preferred content is 25%, 23%, 20%, 17%, 15%, 13%, and 10% based on the total amount of the composition of the present invention.

The lower limit of the preferable content of the compound represented by the formula (L-1-5) relative to the total amount of the composition of the present invention is 1%, 5%, 10%, 13%, 15%, 17% , And 20%, respectively. The upper limit of the preferred content is 25%, 23%, 20%, 17%, 15%, 13%, and 10% based on the total amount of the composition of the present invention.

The compounds represented by formulas (L-1-4) and (L-1-5) are preferably selected from the group of compounds represented by formulas (L-1-4.1) to Compound is preferably a compound represented by the formula (L-1-4.2) or the formula (L-1-5.2).

The lower limit of the preferable content of the compound represented by the formula (L-1-4.2) with respect to the total amount of the composition of the present invention is 1%, 2%, 3%, 5%, 7%, 10% , 13%, 15%, 18%, 20%. The upper limit of the preferable content is 20%, 17%, 15%, 13%, 10%, 8%, 7%, and 6% based on the total amount of the composition of the present invention.

(L-1-1.3), L-1-2.2, L-1-3.1, L-1-3.3, L- -3.11) and the compound represented by the formula (L-1-3.12), and it is preferable to use a compound represented by the formula (L-1-1.3), the formula (L-1-2.2) It is preferable to combine two or more compounds selected from compounds represented by the formula (L-1-3.1), (L-1-3.3), (L-1-3.4) , And the lower limit of the preferable content of the total content of these compounds is 1%, 2%, 3%, 5%, 7%, 10%, and 13% based on the total amount of the composition of the present invention , 15%, 18%, 20%, 23%, 25%, 27%, 30%, 33%, and 35% of the total amount of the composition of the present invention %, 70%, 60%, 50%, 45%, 40%, 37%, 35%, 33%, 30%, 28%, 25%, 23% , And 20%, respectively. When the reliability of the composition is emphasized, the combination of two or more compounds selected from the compounds represented by the formulas (L-1-3.1), (L-1-3.3) and (L-1-3.4) When the response speed of the composition is emphasized, it is preferable to combine two or more compounds selected from the compounds represented by the formulas (L-1-1.3) and (L-1-2.2).

The compound represented by the general formula (L-2) is the following compound.

( ^Wherein R ^L21 and R ^L22 each independently represent the same meaning as R ^L1 and R ^L2 in formula (L)).

R ^L21 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and R ^L22 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, An alkoxy group of 1 to 4 is preferable.

When the solubility at low temperature is emphasized, the effect is high when the content is set to a larger value. On the contrary, when the response speed is set to be important, the effect is more effective when the content is set to be less. In addition, in the case of improving the droplet trail or the baking property, it is preferable to set the range of the content to a medium value.

The lower limit of the preferable content of the compound represented by the formula (L-2) to the total amount of the composition of the present invention is 1%, 2%, 3%, 5%, 7%, and 10%. The upper limit of the preferred content is 20%, 15%, 13%, 10%, 8%, 7%, 6%, 5% and 3% based on the total amount of the composition of the present invention .

The compound represented by the general formula (L-2) is preferably a compound selected from the group of compounds represented by the formulas (L-2.1) to (L-2.6) (L-2.3), (L-2.4) and (L-2.6).

The compound represented by the general formula (L-3) is the following compound.

( ^Wherein R ^L31 and R ^L32 each independently represent the same meaning as R ^L1 and R ^L2 in formula (L)).

R ^L31 and R ^L32 are each independently preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The compound represented by the general formula (L-3) may be used alone, but two or more compounds may be used in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound used is, for example, one kind of the present invention, two kinds, three kinds, four kinds, and five or more kinds.

The lower limit of the preferable content of the compound represented by the formula (L-3) to the total amount of the composition of the present invention is 1%, 2%, 3%, 5%, 7%, and 10%. The upper limit of the preferred content is 20%, 15%, 13%, 10%, 8%, 7%, 6%, 5% and 3% based on the total amount of the composition of the present invention .

When obtaining a high birefringence when a lot bit set to a high content of effect, on the contrary, it is set to be smaller when some content is highly effective if an emphasis on a high T _NI. In addition, in the case of improving the droplet trail or the baking property, it is preferable to set the range of the content to a medium value.

The compound represented by the general formula (L-3) is preferably a compound selected from the group of compounds represented by the formulas (L-3.1) to (L-3.4) (L-3.7).

The compound represented by the general formula (L-4) is the following compound.

( ^Wherein R ^L41 and R ^L42 each independently represent the same meaning as R ^L1 and R ^L2 in formula (L)).

R ^L41 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and R ^L42 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, An alkoxy group of 1 to 4 is preferable).

The compound represented by the general formula (L-4) may be used alone, but two or more compounds may be used in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound used is, for example, one kind of the present invention, two kinds, three kinds, four kinds, and five or more kinds.

In the composition of the present invention, the content of the compound represented by the general formula (L-4) is preferably in the range of from 0.1 to 10 parts by weight, more preferably from 1 to 50 parts by weight, It is necessary to adjust it appropriately according to the performance.

The lower limit of the preferable content of the compound represented by the formula (L-4) to the total amount of the composition of the present invention is 1%, 2%, 3%, 5%, 7%, 10% %, 16%, 20%, 23%, 26%, 30%, 35%, 40%. The upper limit of the preferable content of the compound represented by the formula (L-4) to the total amount of the composition of the present invention is 50%, 40%, 35%, 30%, 20%, 15% %, And 5%.

The compound represented by formula (L-4) is preferably a compound represented by formula (L-4.1) to (L-4.3), for example.

(L-4.1) or may contain a compound represented by the formula (L-4.2) in accordance with required performance such as solubility at low temperature, transition temperature, electrical reliability and birefringence (L-4.1) and the compound represented by the formula (L-4.2), and the compound represented by the formula (L-4.1) to the compound represented by the formula May be included. The lower limit of the preferable content of the compound represented by the formula (L-4.1) or the formula (L-4.2) to the total amount of the composition of the present invention is 3%, 5%, 7%, 9% , 12%, 13%, 18% and 21%, and the upper limit is 45%, 40%, 35%, 30%, 25%, 23%, 20% 18%, 15%, 13%, 10%, 8%.

When both the compound represented by the formula (L-4.1) and the compound represented by the formula (L-4.2) are contained, the lower limit of the preferable content of the two compounds relative to the total amount of the composition of the present invention is 5% 15%, 19%, 24%, 30%, and the upper limit is 45%, 40%, 35%, 30%, 25%, 23%, 20%, 18% , 15%, and 13%.

The compound represented by the general formula (L-4) is preferably a compound represented by the formula (L-4.4) to (L-4.6) desirable.

(L-4.4) or may contain a compound represented by the formula (L-4.5) in accordance with required performance such as solubility at low temperature, transition temperature, electrical reliability and birefringence , And may contain both a compound represented by the formula (L-4.4) and a compound represented by the formula (L-4.5).

The lower limit of the preferable content of the compound represented by the formula (L-4.4) or the formula (L-4.5) to the total amount of the composition of the present invention is 3%, 5%, 7%, 9% , 12%, 13%, 18%, 21%. The preferred upper limit is 45%, which is 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10%, 8% to be.

When both the compound represented by the formula (L-4.4) and the compound represented by the formula (L-4.5) are contained, the lower limit of the preferable content of the two compounds relative to the total amount of the composition of the present invention is 5% 15%, 19%, 24%, 30%, and the upper limit is 45%, 40%, 35%, 30%, 25%, 23%, 20%, 18% , 15%, and 13%.

The compound represented by formula (L-4) is preferably a compound represented by formula (L-4.7) to formula (L-4.10), particularly preferably a compound represented by formula (L-4.9) .

The compound represented by the general formula (L-5) is the following compound.

( ^Wherein R ^L51 and R ^L52 each independently represent the same meaning as R ^L1 and R ^L2 in formula (L)).

R ^L51 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and R ^L52 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, An alkoxy group of 1 to 4 is preferable.

The compound represented by formula (L-5) may be used alone, but two or more compounds may be used in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound used is, for example, one kind of the present invention, two kinds, three kinds, four kinds, and five or more kinds.

In the composition of the present invention, the content of the compound represented by the general formula (L-5) is preferably in the range of from 0.1 to 10 parts by weight, more preferably from 1 to 20 parts by weight, It is necessary to adjust it appropriately according to the performance.

The lower limit of the preferable content of the compound represented by the formula (L-5) to the total amount of the composition of the present invention is 1%, 2%, 3%, 5%, 7%, 10% %, 16%, 20%, 23%, 26%, 30%, 35%, 40%. The upper limit of the preferable content of the compound represented by the formula (L-5) to the total amount of the composition of the present invention is 50%, 40%, 35%, 30%, 20%, 15% %, And 5%.

The compound represented by the general formula (L-5) is preferably a compound represented by the formula (L-5.1) or the formula (L-5.2) Do.

The lower limit of the preferred content of these compounds relative to the total amount of the composition of the present invention is 1%, 2%, 3%, 5%, and 7%. The upper limit of the preferable content of these compounds is 20%, 15%, 13%, 10%, and 9%.

The compound represented by formula (L-5) is preferably a compound represented by formula (L-5.3) or (L-5.4).

The compound represented by the general formula (L-5) is preferably a compound selected from the group of compounds represented by the formulas (L-5.5) to (L-5.7).

The compound represented by the general formula (L-6) is the following compound.

^Wherein R ^L61 and R ^L62 each independently represent the same meaning as R ^L1 and R ^L2 in formula (L), and X ^L61 and X ^L62 each independently represent a hydrogen atom or a fluorine atom. )

R ^L61 and R ^L62 each independently are preferably an alkyl group of 1 to 5 carbon atoms or an alkenyl group of 2 to 5 carbon atoms, and it is preferable that one of X ^L61 and X ^L62 is a fluorine atom and the other is a hydrogen atom .

The compound represented by the general formula (L-6) may be used alone, but two or more compounds may be used in combination. There is no particular limitation on the kind of compound that can be combined, but it is suitably used in combination according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound used is, for example, one kind of the present invention, two kinds, three kinds, four kinds, and five or more kinds.

The lower limit of the preferable content of the compound represented by the formula (L-6) to the total amount of the composition of the present invention is 1%, 2%, 3%, 5%, 7%, 10% %, 16%, 20%, 23%, 26%, 30%, 35%, 40%. The upper limit of the preferable content of the compound represented by the formula (L-6) to the total amount of the composition of the present invention is 50%, 40%, 35%, 30%, 20%, 15% %, And 5%. When the emphasis is placed on increasing Δn, it is preferable to increase the content, and in the case where emphasis is placed on precipitation at a low temperature, the content is preferably small.

The compound represented by the general formula (L-6) is preferably a compound represented by the general formulas (L-6.1) to (L-6.9).

There is no particular limitation on the kind of compound that can be combined, but it is preferable to contain one to three kinds of these compounds, more preferably one kind to four kinds. (L-6.4) or (L-6.4) from the compound represented by the formula (L-6.1) or (L-6.2) since the compound to be selected is effective in solubility, (L-6.8) or (L-6.9) from the compound represented by the formula (L-6.6) It is preferable to select a kind of compound and appropriately combine them. Among them, it is preferable to include a compound represented by formula (L-6.1), formula (L-6.3), formula (L-6.4), formula (L-6.6) and formula (L-6.9).

The compound represented by formula (L-6) is preferably a compound represented by formula (L-6.10) to formula (L-6.17) It is preferably a compound to be displayed.

The compound represented by the general formula (L-7) is the following compound.

( ^Wherein L ^L71 and R ^L72 each independently represents the same meaning as R ^L1 and R ^L2 in formula (L), and A ^L71 and A ^L72 are each independently a group represented by A ^L2 and A ^L3 . The hydrogen atoms on A ^L71 and A ^L72 may each independently be replaced by a fluorine atom, and Z ^L71 has the same meaning as Z ^L2 in formula (L) X ^L71 and X ^L72 each independently represent a fluorine atom or a hydrogen atom.

In the formulas, R ^L71 and R ^L72 are each independently preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and A ^L71 and A ^L72 are each Cyclohexylene group or 1,4-phenylene group is preferable, and hydrogen atoms on A ^L71 and A ^L72 may be independently substituted by fluorine atom, and Z ^L71 is a single bond or COO- , A single bond is preferable, and X ^L71 and X ^L72 are preferably a hydrogen atom.

There is no particular limitation on the kind of the compound that can be combined, but it is combined according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. The kind of compound to be used is, for example, one kind of the present invention, two kinds, three kinds, and four kinds.

In the composition of the present invention, the content of the compound represented by the general formula (L-7) is preferably in the range of from 0.1 to 10 parts by weight, more preferably from 10 to 50 parts by weight, It is necessary to adjust it appropriately according to the performance.

The lower limit of the preferable content of the compound represented by the general formula (L-7) to the total amount of the composition of the present invention is 1%, 2%, 3%, 5%, 7%, 10% 14%, 16%, and 20%. The upper limit of the preferable content of the compound represented by the formula (L-7) to the total amount of the composition of the present invention is 30%, 25%, 23%, 20%, 18%, 15% %, And 5%.

When the composition of the present invention is desired to have a high T _NI , it is preferable to increase the content of the compound represented by the general formula (L-7) a little. When a low viscosity embodiment is desired, It is preferable to reduce the number.

The compound represented by formula (L-7) is preferably a compound represented by formula (L-7.1) to formula (L-7.4) Do.

The compound represented by formula (L-7) is preferably a compound represented by formula (L-7.11) to formula (L-7.13) Do.

The compound represented by formula (L-7) is a compound represented by formula (L-7.21) to formula (L-7.23). Is preferably a compound represented by the formula (L-7.21).

The compound represented by formula (L-7) is preferably a compound represented by formula (L-7.31) to formula (L-7.34) 7.32).

The compound represented by formula (L-7) is preferably a compound represented by formula (L-7.41) to formula (L-7.44) 7.42).

A suitable form of the liquid crystal composition according to the present invention is that the lower limit of the total amount of the compound represented by the general formula (i) and the compound represented by the general formula (L) in the entire liquid crystal composition (100 mass% 93 mass%, 94 mass%, 95 mass%, 96 mass%, 97 mass%, 86 mass%, 87 mass%, 88 mass%, 89 mass%, 90 mass%, 91 mass% %, 98% by mass, 99% by mass, and 100% by mass. The upper limit of the total amount of the compound represented by the general formula (i) and the compound represented by the general formula (L) in the entire liquid crystal composition (100 mass%) is 100 mass%, 99 mass%, 98 mass%, 97 mass% It is preferably 96 mass%, 95 mass%, 94 mass%, 93 mass%, 92 mass%, 91 mass% or less and 90 mass%.

A preferred embodiment of the liquid crystal composition according to the present invention is characterized in that the upper limit of the content of the component having a negative dielectric anisotropy (??) In the entire liquid crystal composition (100 mass%) is 95 mass%, 94 mass% 82 mass%, 81 mass%, 92 mass%, 91 mass% or less, 90 mass%, 89 mass%, 88 mass%, 87 mass%, 86 mass%, 85 mass%, 84 mass%, 83 mass%, 82 mass% 74 mass%, 73 mass%, 72 mass%, 71 mass%, 70 mass%, 69 mass%, 80 mass%, 79 mass%, 78 mass%, 77 mass% It is preferable that the content of the polypropylene resin is 68 mass%, 67 mass%, 66 mass%, 65 mass%, 64 mass%, 63 mass%, 62 mass%, 61 mass%, 60 mass%, 59 mass%, 58 mass% and 57 mass% Do. The lower limit of the content of the component having a negative dielectric anisotropy (??) In the entire liquid crystal composition (100 mass%) was 10 mass%, 12 mass%, 14 mass%, 16 mass%, 18 mass %, 20 mass%, 21 mass%, 22 mass% or less, 23 mass%, 24 mass%, 25 mass%, 26 mass%, 27 mass%, 28 mass%, 29 mass%, 30 mass% , 32 mass%, 33 mass%, 34 mass%, 35 mass%, 36 mass%, 37 mass%, 38 mass%, 39 mass%, 40 mass%, 41 mass%, 42 mass%, 43 mass% 47 mass%, 48 mass%, 49 mass%, 50 mass%, 51 mass%, and 52 mass%, respectively.

If the content of the component having a negative dielectric anisotropy (DELTA epsilon) (-1.5 > DELTA epsilon) in the composition becomes too large, flicker tends to occur. Therefore, a preferred embodiment of the liquid crystal composition according to the present invention from the above viewpoints is that the upper limit of the content of the component having a negative dielectric anisotropy (-1.5>? E) in the entire liquid crystal composition (100 mass%) is 95 mass% Or less, more preferably 86 mass% or less.

A preferred embodiment of the liquid crystal composition according to the present invention is characterized in that the upper limit of the content of components having a neutral (-1.5??? 1.5) dielectric anisotropy in the entire liquid crystal composition (100 mass%) is 90 mass%, 88 mass% 72 mass%, 70 mass%, 68 mass%, 66 mass%, 63 mass%, 60 mass%, 80 mass%, 78 mass%, 76 mass%, 74 mass% 55 mass%, 52 mass%, 50 mass%, 47 mass%, 45 mass%, 43 mass%, 40 mass%, 38 mass%, 36 mass%, 34 mass%, 32 mass%, 30 mass %, 28% by mass, and 26% by mass. The lower limit of the content of the component having the dielectric anisotropy of neutrality (-1.5??? 1.5) in the entire liquid crystal composition (100 mass%) was 7 mass%, 8 mass%, 9 mass%, 10 mass% , 12 mass%, 13 mass%, 14 mass%, 15 mass%, 16 mass%, 17 mass%, 18 mass%, 19 mass%, 20 mass%, 21 mass%, 22 mass% 24 mass%, 25 mass%, 26 mass%, 27 mass%, 28 mass%, 29 mass%, 30 mass%, 31 mass%, 32 mass%, 33 mass%, 34 mass%, 35 mass% It is preferable that the content of the polymer is 37%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 47%, 48% and 50%, respectively.

In a preferred embodiment of the liquid crystal composition according to the present invention, the component exhibiting negative anisotropy of dielectric constant (-1.5 > DELTA epsilon) is a compound selected from the group consisting of compounds represented by formulas (N-1a) to , And it is particularly preferable to be composed of a compound selected from the group consisting of compounds represented by the general formulas (N-1a) to (N-1c).

When a component exhibiting negative (-1.5 > DELTA epsilon) dielectric anisotropy is constituted by the compounds represented by the general formulas (N-1a) to (N-1c), not only the dielectric anisotropy can be suppressed to a relatively low level, The generation of flicker due to polarization can also be reduced.

A preferred embodiment of the liquid crystal composition according to the present invention is a composition containing a compound represented by the general formula (N-1a) and a compound represented by the general formula (N-1b) among the components exhibiting the negative anisotropy of dielectric constant And the total amount of the compound represented by the general formula (N-1c) is preferably larger than the total amount of the total amount of the compound represented by the general formula (N-1d) and the compound represented by the general formula (N-1e) . The amount of the compound (for example, the formula (N-1a) to the formula (N-1c)) exhibiting the dielectric anisotropy of a ring-like annular sound (-1.5> If the number of compounds having a negative dielectric anisotropy of negative (-2 > DELTA epsilon) including the connected coupler is larger than that of the compound having a negative dielectric anisotropy, the generation of flicker due to the flexo polarization can be reduced.

A suitable form of the liquid crystal composition according to the present invention is a liquid crystal composition containing a compound represented by the general formula (N-1a), a compound represented by the general formula (N-1b) and a compound represented by the general formula (Total amount) of the compound represented by the general formula (N-1c), the compound represented by the general formula (N-1d), the compound represented by the general formula (N-1e) and the compound represented by the general formula (L) The lower limit of the amount of the component (A) is 85 mass%, 86 mass%, 87 mass%, 88 mass%, 89 mass%, 90 mass%, 91 mass%, 92 mass%, 93 mass%, 94 mass% 97% by mass, 98% by mass, 99% by mass and 100% by mass. The compound represented by the general formula (N-1b), the compound represented by the general formula (N-1b) and the compound represented by the general formula (N-1c) in the entire liquid crystal composition (100 mass% , The total amount of the compound represented by the general formula (N-1d), the compound represented by the general formula (N-1e) and the compound represented by the general formula (L) is 100% , 98 mass%, 97 mass%, 96 mass%, 95 mass%, 94 mass%, 93 mass%, 92 mass%, 91 mass%

The liquid crystal composition of the present invention has a dielectric anisotropy (DELTA epsilon) at 25 DEG C within a suitable range of -1.0 to -7.0. From the viewpoint of reducing the driving voltage and flicker, it is preferably -1.0 or more and less than -6.0, More preferably less than -6.0, and particularly preferably -2.5 to -5.5. A liquid crystal composition having a large dielectric anisotropy is difficult to reduce flicker relatively in terms of flexo-polarization. Therefore, a preferable liquid crystal composition according to the present invention preferably has a dielectric anisotropy (DELTA epsilon) at 25 DEG C of -1.0 to -7.0, more preferably -2.0 or more and -6.0 or less.

The liquid crystal composition of the present invention has a refractive index anisotropy (? N) at 25 ° C of 0.08 to 0.14, more preferably 0.09 to 0.13, and particularly preferably 0.09 to 0.128. More specifically, it is preferable that the thickness is in the range of 0.10 to 0.13 corresponding to a thin cell gap, and 0.08 to 0.10 in a case corresponding to a thick cell gap.

The liquid crystal composition of the present invention preferably has a viscosity (eta) at 20 ° C of 10 to 50 mPa · s, preferably 10 to 45 mPa · s, more preferably 10 to 40 mPa · s and a viscosity of 10 to 35 mPa · s More preferably 10 to 30 mPa · s, even more preferably 10 to 25 mPa · s, and particularly preferably 10 to 22 mPa · s.

The liquid crystal composition of the present invention preferably has a rotational viscosity (? ₁ ) at 25 占 폚 of 50 to 250 mPa 占 퐏, preferably 55 to 170 mPa 占 퐏, preferably 60 to 160 mPa 占 퐏, .

The liquid crystal composition of the present invention has a nematic phase-isotropic liquid phase transition temperature (T _NI ) of 60 to 120 ° C, more preferably 70 to 100 ° C, further preferably 70 to 85 ° C, Deg.] C is particularly preferable.

The negative liquid crystal composition used in an actual liquid crystal display element contains two components, that is, a compound having negative dielectric anisotropy (polar component) and a compound having negative dielectric anisotropy (non-polar component) To several tens of kinds of liquid crystal compounds. Therefore, since the polarization component of the liquid crystal compound of the polar component is mainly directly involved in the flexoelectric effect (flexo polarization), the polarity of the polarization Is dependent on the polarization of the liquid crystal compound of the polar component or its content.

As described above, since the liquid crystal display element of the present invention carries out the inversion drive for every one frame, if the luminance fluctuation due to the positional change of the polarization is further added, the fluctuation of the luminance becomes large and flicker occurs, .

In the present invention, however, since the liquid crystal compound (liquid crystal layer) can be made uniform over the entire area of the polarization-specific position of the compound by combining and specifying the content of the liquid crystal compound having a specific negative dielectric anisotropy, I think it can be done.

The form of the liquid crystal composition of the present invention is such that the liquid crystal compound of the polar component (liquid crystal compound exhibiting a negative dielectric anisotropy) is a compound represented by the general formulas (N-1-1) to (N-1-5) (N-1-10) to a compound represented by the general formula (N-1-13), and these compounds have a dielectric constant of negative (-1.5> Δε) Preferably accounts for 80% by mass or more and 100% by mass or less of the anisotropic component (100% by mass).

A suitable form of the liquid crystal composition according to the present invention is that a liquid crystal compound of a polar component (liquid crystal compound exhibiting a negative dielectric anisotropy) is a compound represented by the general formulas (N-1-1) to (N-1-5) (-1.5 > &le;) of at least one member selected from the group consisting of compounds represented by the general formulas (N-1-10) to (N-1-13) (N-1-1) to (N-1-5) accounts for 80% by mass or more and 100% by mass or less of the component (100% And more preferably more than the total content of the compounds represented by formulas (N-1-10) to (N-1-13).

Subsequently, the operation and action of the display processing unit of the liquid crystal display element of the present invention will be described below.

The display processing unit according to the present invention is provided with a low frequency driving function and an intermittent driving function for reducing driving power in addition to the normal driving and includes a gate driver which is an LSI for driving a gate bus line of a TFT liquid crystal panel, And a function of controlling a source driver which is an LSI for driving a line. It may also have a function of supplying a common voltage (V _COM ) to the common electrode to control the operation of the backlight.

The term " low frequency drive " in this specification refers to a drive frequency of a liquid crystal display element itself (for example, 60 Hz, 120 Hz or 240 Hz) by 1/2, 1/4, 1/6, (For example, 60 Hz, 120 Hz or 240 Hz) itself is not changed, and the driving frequency of the liquid crystal display element is changed without changing the driving frequency of the liquid crystal display element (Idle period) in which the control circuit is stopped after the writing of one display period is made (since the cycle of rewriting the image signal to the pixel electrode becomes longer depending on the idle period, the apparent frame frequency is lowered do.).

According to the present invention, since the frame frequency of the image signal to the pixel electrode can be controlled by the display processing unit in a range of more than 0 Hz to 59 Hz or less, (60 Hz, 120 Hz or 240 Hz) and a state where the frame frequency is more than 0 Hz but not more than 59 Hz (low-frequency drive or intermittent drive) can be reversibly switched.

Further, in the display processing unit according to the present invention, the above-described liquid crystal display unit is driven, and the frame frequency of the image signal to the pixel electrode can be arbitrarily controlled within a range of 59 Hz or less and 0 Hz or more. In other words, The period (= rewrite cycle) for rewriting the image signal to the pixel electrode can be controlled so as to be able to expand. That is, the time from when the image signal (voltage) is applied to the pixel electrode to when the image signal (voltage) is applied to the pixel electrode next time can be controlled so as to be able to be sprinkled by the display processing unit. Therefore, the frame frequency, which is the number of times of scanning (rewriting) one frame per second, can be controlled so as to be able to be sprinkled by the display processing unit.

The time from when the image signal (voltage) is applied to the pixel electrode to when the image signal (voltage) is applied to the pixel electrode is controlled by the display processing unit so that the image signal The frame period which is a time interval for performing rewriting is appropriately controlled within a predetermined time. Therefore, it is preferable that the display processing unit related to the present invention is capable of controlling two or more different frame frequencies, and at least one of the two or more different frame frequencies is less than 59 Hz to more than 0 Hz.

The frame frequency in the low frequency driving or intermittent driving state according to the present invention is preferably in the range of more than 0 to 59 Hz, more preferably in the range of 0.1 Hz to 59 Hz, more preferably in the range of 0.2 Hz to 58 Hz, Is preferable, and 0.5 Hz to 55 Hz is preferable.

For example, in the case of displaying a still image, it is preferable that it is less than 0.1 to 30 Hz, and in the case of displaying a moving image, it is preferable that it is more than 30 and less than 59 Hz.

The lower limit of the frame frequency in displaying the still image of the former is preferably 0.1 Hz, 0.2 Hz, 0.5 Hz, 0.7 Hz, 0.9 Hz, and 1.0 Hz in this order. The upper limit of the frame frequency in the case of displaying the still image of the former is 29.5 Hz, 28.0 Hz, 25.0 Hz, 23.0 Hz, 20.0 Hz, 18.0 Hz, 16.0 Hz, 14.0 Hz, 13.0 Hz, 12.0 Hz, 11.0 Hz, .

On the other hand, the lower limit of the frame frequency in displaying a moving picture is preferably 30 Hz, 30.2 Hz, 30.5 Hz, and 31.0 Hz in that order. The upper limit of the frame frequency in the case of displaying the latter moving picture is 59.0 Hz, 58.0 Hz, 57.0 Hz, 56.0 Hz, 53.0 Hz, 52.0 Hz, 51.0 Hz, 50.0 Hz, 48.0 Hz, 47.0 Hz, 46.0 Hz, 45.0 Hz, 43.0 Hz, 42.0 Hz, and 40.0 Hz.

It is particularly preferable to control the frame frequency in the case of displaying a moving picture in the low-frequency driving or intermittent driving state to 30 to 40 Hz. It is particularly preferable to control the frame frequency in the case of displaying the still image in the low frequency drive or the intermittent drive state to 1 to 10 Hz.

As described above, the display processing unit of the present invention can control the period (= rewrite cycle) for rewriting the image signal to the pixel electrode so that the frame frequency of the image signal to the pixel electrode is controlled to be 59 Hz or less at 0 Hz Can be controlled within a range of over. (= The frame frequency of the image signal is lengthened), the period from the first drive mode driven at the first frame frequency to the second frame at the second frame frequency lower than the first frame frequency And a third drive mode driven by a frequency. More specifically, for example, when the frame frequency is in a range of more than 0 to 59 Hz (for example, from a first drive mode in which the first frame frequency is 60, 120, or 240 Hz) Frequency drive (third drive mode) controlled in the range of the low-frequency drive (third drive mode). As another mode for lengthening the cycle of rewriting the image signal, for example, a first driving mode (for example, a normal driving in which the first frame frequency is 60, 120 or 240 Hz or more) driving at a first frame frequency , And intermittent driving (second driving mode) (frame frequency is more than 0 to 59Hz) for setting a rest period equivalent to exceeding one frame.

Next, examples of shortening the rewrite cycle of the image signal (= shortening the frame frequency of the image signal) include switching from the low-frequency drive or intermittent drive in the second or third drive mode to the normal drive .

According to these aspects, the display processing unit of the present invention can reversibly switch to two or more drive modes having different frame frequencies by controlling the frame frequency of the image signal to the pixel electrode to be in the range of 59 Hz or less to 0 Hz or more.

The method of driving a liquid crystal display element of the present invention not only can reduce power consumption by combining the above drive modes (first to third drive modes), but also uses a specific liquid crystal composition in the present invention, It is possible to reduce the flicker at the time of switching to low-frequency drive or intermittent drive.

Hereinafter, the driving method of the pixel of the present invention will be described in detail.

"Switching between the first drive mode and the second drive mode"

(Switching between normal driving and intermittent driving)

When the frame frequency of the image signal to the pixel electrode in the normal driving (first driving mode) is, for example, 60 Hz, since the entire screen is scanned over (1/60) second, The rewriting is performed once every 0.0167 seconds (the image signal rewriting period is 1/60). After the rewriting operation in which this 1/60 second is required, for example, the idle period in which the driver or the display processing unit corresponding to 2 frames, 10 frames or 100 frames is not operated and the rewriting of the image signal to the pixel electrode is resumed (Second drive mode) of the image signal to the pixel electrode from the time when the image signal to the pixel electrode is finally rewritten to the time when the rewriting of the image signal to the pixel electrode is resumed, Longer than 1/60 second.

During the idle period in which the driver or the display processing section does not operate, the operation of the control circuit or the like is stopped, so that the circuit power consumption during the operation is lost and the power consumption can be reduced.

Therefore, by setting the idle period during which the driver or the display processing unit does not operate, the rewrite timing of the image signal to the pixel electrode can be controlled by the display processing unit, thereby changing the rewrite cycle of the image signal. In other words, the power consumption can be reduced by controlling the frame frequency of the image signal from the display processing unit to the pixel electrode to be in the range of 59 Hz or less to 0 Hz or more, and enabling the rewrite cycle of the image signal to be sparse.

An example of a method of driving a liquid crystal display element according to the present invention will be described below with reference to Fig.

11 (A) is a diagram showing a change over time of the rewriting of the image signal in the pixel electrodes in the 2m row and 2n column. Fig. 11B is a diagram showing a change over time of the rewriting of the image signal in the pixel electrode of 2m + 1 row and 2n + 1 column. 11 will be described with reference to a case where the frame frequency of the image signal to the pixel electrode in the first drive mode (normal driving) is 60 Hz.

Since the standard frame frequency of the liquid crystal display element is 60 Hz, the polarity of the voltage applied to the liquid crystal is inverted every frame (1/60 second). In Fig. 11, an example of the column inversion driving is shown as the polarity determination method, but the present invention is not limited to this. For example, in the case of the dot inversion driving, FIG. 11A is a diagram showing a change over time of the rewriting of the image signal in the pixel electrode of 2m row and 2n column and the pixel electrode of 2m + 1 row 2n + 1 column And Fig. 11 (B) may be sufficient to show the change over time of the rewriting of the image signal in the pixel electrode of 2m + 2n + 1 columns.

11A, when the frame frequency of the first drive mode (normal drive) is 60 Hz, the entire screen is scanned over (1/60) second, so that rewriting of the image signal to the pixel is performed in 1/60 second So that the image signals applied to the pixel electrodes arranged in the column direction 2n are inverted every frame of the same polarity in each frame, and the operation of the gate driver and the source driver Is controlled by the display processing unit. 11 (B) shows a state in which a voltage of a polarity opposite to that of Fig. 11 (A) is applied. In order to display an example of the column inversion driving, (Image signal rewriting period 1/60), image signals to be applied to the pixel electrodes arranged in the column direction (2n + 1) are reversed every frame of the same polarity in each frame The display processor controls the operation of the gate driver and the source driver.

11A and 11B, after a rewriting operation in which 1/60 second is required, a second driving mode in which the idle period of a predetermined time for stopping the rewriting operation of the display processing unit, the source driver or the gate driver is set State), the circuit power consumption during the idle period becomes zero, so that the circuit power can be reduced. Thereafter, when the idle period is ended and the mode is switched to the normal drive mode (first drive mode), the rewrite operation of the image signal to the pixel electrode is performed, so that the rewrite of the image signal to the pixel before the idle period, (I.e., the rewriting period of the image signal in the first driving mode) and the period between the rewriting of the image signal to the pixel immediately before the idle period and the rewriting of the image signal to the pixel after the end of the idle period (The rewrite period of the image signal to the pixel electrode in the second drive mode becomes longer than the rewrite period of the image signal to the pixel electrode in the first drive mode).

The image signal (voltage signal) written immediately before the idle period is held in the pixel electrode until the next image signal (voltage signal) is written.

11, a still image is displayed (switched to the second drive mode) after the moving picture is displayed (first drive mode) in conjunction with the content displayed on the liquid crystal display element, and the moving picture is again displayed Quot; mode ").

"Switching between the first drive mode and the third drive mode"

(Switching between normal driving and low frequency driving)

When the frame frequency of the image signal to the pixel electrode in the normal driving (first driving mode) is, for example, 60 Hz, since the entire screen is scanned over (1/60) second, (The rewriting cycle of the image signal) (Similarly, in the case of 120 Hz, the entire screen is scanned over (1/120) second, and in the case of 240 Hz, the entire screen is divided by (1/240) Lt; / RTI > When switching from this state to a third drive mode for rewriting an image signal to a pixel at a lower frame frequency than the first drive mode, that is, for example, switching to a low-frequency drive state in which the frame frequency of the image signal is 1 Hz , The entire screen is scanned over (1/1) second, so that the rewriting of the image signal to the pixel is performed once per second (the rewriting period of the image signal is 1/1). Therefore, Can be reduced. When switching from the low-frequency drive state (third drive mode) to the normal drive (first drive mode), the rewriting of the image signal to the above-described pixel returns to the state of performing once every 0.0167 seconds.

Therefore, by changing the frame frequency of the image signal to the pixel electrode in the display processing unit, the rewrite cycle of the image signal can be changed. In other words, the frame frequency of the image signal from the display processing unit to the pixel electrode can be controlled to be in the range of more than 0 Hz to 59 Hz or less, and the wavelength of the image signal can be switched to be increased or decreased so that the rewrite cycle of the image signal can be spun .

For example, an example of a preferred driving method related to the present invention will be described with reference to Fig. Fig. 12A is a diagram showing a change over time of the rewriting of the image signal in the pixel electrodes in the 2m row and 2n column. Fig. 12B is a diagram showing a change over time of the rewriting of the image signal in the pixel electrode of 2m + 1 row and 2n + 1 column.

12 is obtained by setting the frame frequency of the image signal to the pixel electrode in the first drive mode (normal drive) to 60 Hz and the frame frequency of the image signal to the pixel electrode in the third drive mode (low frequency drive) to 6 Hz One case will be explained. In addition, although the polarity of the voltage applied to the liquid crystal is inverted every frame (1/60 sec) at the standard frame frequency of the liquid crystal display element of 60 Hz, an example of the column inversion driving is shown in Fig. 12, The present invention is not limited thereto. For example, in the case of the dot inversion driving, FIG. 12A is a diagram showing a change over time of the rewriting of the image signal in the pixel electrode of 2m row and 2n column and the pixel electrode of 2m + 1 row 2n + 1 column And Fig. 12 (B) may be sufficient to show the change over time of the rewriting of the image signal in the pixel electrode of 2m + 2n + 1 columns.

12A, when the frame frequency of the first drive mode (normal drive) is 60 Hz, the entire screen is scanned over (1/60) second, so that the rewriting of the image signal to the pixel is performed in 1/60 second The operation of the gate driver and the source driver is performed so that the image signals applied to the pixel electrodes arranged in the column direction 2n are inverted every frame of the same polarity in each frame Additional control is performed.

From a first drive mode (normal driving) in which the writing of image signals to the pixel electrodes is performed once every 1/60 second while inverting the applied polarity, a third frame frequency lower than the first frame frequency (for example, 6 Hz (1/6) second, the applied polarity is inverted every 1/6, and the image signal to the pixel electrode is inverted every 1/6 second, Is rewritten once every (1/6) second.

Therefore, the rewrite cycle of the image signal in the third drive mode becomes longer than the rewrite cycle of the image signal in the first drive mode. As a result, the number of times of rewriting of the image signal is reduced, so that the power consumption can be reduced.

For example, in the case of displaying a still image or an image with insufficient visibility even in a moving image, the display processing section can perform low-frequency driving or intermittent driving to reduce power consumption.

In FIG. 12, a moving image is displayed (in a third driving mode) after the moving image is displayed (first driving mode) in conjunction with the content displayed on the liquid crystal display element, (Switching to the first drive mode).

As another example of the preferable driving method related to the present invention, the following description will be made with reference to Fig. FIG. 13A is a diagram showing a temporal change of rewriting of an image signal in a pixel electrode of 2m row 2n column. 13B is a diagram showing a change over time of rewriting of an image signal in a pixel electrode of 2m + 1 row and 2n + 1 column, and polarity inversion and frame frequency are the same as in FIGS. 7 and 8 .

13A and 13B, from the first drive mode (normal drive) in which the rewriting of the image signal to the pixel electrode is performed once every 1/60 second while inverting the polarity to be applied, (1/6) second is switched to the third drive mode (low-frequency state) driven at a lower third frame frequency (e.g., 6 Hz), the applied polarity is (1 / 6), and the image signal to the pixel electrode is rewritten once every (1/6) second. Thereafter, when the rewriting operation is switched to the second driving mode (intermittent driving state) in which the idle period of the predetermined time period for stopping the rewriting operation of the display processing unit, the source driver or the gate driver is set, Therefore, the circuit power can be reduced. Thereafter, when the idle period is terminated and the mode is switched to the low frequency state (third drive mode), the rewriting operation of the image signal to the pixel electrode is performed. Therefore, the rewriting of the image signal to the pixel before the idle period, (I.e., the rewrite cycle of the image signal in the third drive mode) and the rewriting of the image signal to the pixel just before the idle period to the rewriting of the image signal to the pixel after the end of the idle period The rewrite cycle of the image signal in the second drive mode). Then, thereafter, when switching from the low-frequency drive state (third drive mode) to the normal drive (first drive mode), the rewriting of the image signal to the above-described pixel returns to the state of performing 1/60 times.

The power consumption can be further reduced by combining low-frequency driving and intermittent driving as in the embodiment shown in Fig. 13 and the like.

In FIG. 13, a moving image with a slow motion is displayed (switched to the third driving mode) after displaying a moving image with a high speed in interlock with the content displayed on the liquid crystal display element (first driving mode) (Switching to the second drive mode), and again displays a moving image (switching to the first drive mode).

INDUSTRIAL APPLICABILITY The present invention can be applied to a liquid crystal display device having a liquid crystal display part such as VA, PSVA, FFS and / or IPS. A method of reducing flicker caused by a decrease in the voltage holding ratio has been desired in active driving such as VA, PSVA, FFS and / or IPS, and particularly in low frequency driving. Further, as compared with the VA mode, the FFS and IPS drive modes are subject to a strong electric field in the liquid crystal upon application of a voltage, so that flexo polarization is apt to occur and flicker is likely to occur. Therefore, as compared with the VA or PSVA mode, there is a demand for a method of reducing the flicker caused by the flexo polarization as well as the flicker caused by the decrease in the voltage holding ratio.

Therefore, a preferred embodiment of the liquid crystal display part of the present invention is a liquid crystal display part comprising: a liquid crystal layer; and an orientation film layer for inducing a homogeneous orientation between the first substrate and the second substrate, .

Particularly, since the FFS type display element generates a fringe electric field near the edge portion of the electrode, a particularly preferable aspect of the liquid crystal display part of the present invention is that the inter-electrode distance R between the pixel electrode and the common electrode is smaller than the inter- Is smaller than a distance G of the second substrate, and forms a fringe electric field between the pixel electrode and the electrode of the common electrode.

Example

Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples. In the compositions of the following Examples and Comparative Examples, "%" means "% by mass".

The following abbreviations are used for the description of the compounds in the examples.

(chain)

-n -C _n H _{2n + 1} linear alkyl group having n carbon atoms

n-C _n H _{2n + 1} - a linear alkyl group having n carbon atoms

-O _n -OC _n H _{2n + 1} straight chain alkoxyl group having n carbon atoms

nO - C _n H _{2n + 1} O - straight chain alkoxyl group having n carbon atoms

-nO-C _n H _2n O-

-On- -OC _n H _2n -

- _n - C _n H _2n -

-V-CH = CH ₂

V- CH ₂ = CH-

-V1 -CH = CH-CH ₃

1V- CH ₃ -CH = CH-

(Ring structure)

The properties measured in the examples are as follows.

T _NI : nematic phase - isotropic liquid phase transition temperature (캜)

? N: refractive index anisotropy at 25 占 폚

?: viscosity at 20 占 폚 (mPa 占 퐏)

? ₁ : rotational viscosity at 25 占 폚 (mPa 占 퐏)

??: Dielectric constant anisotropy at 25 占 폚

The liquid crystal compositions of Examples 1 to 15 and the liquid crystal compositions of Comparative Examples 1 to 4 (Tables 1, 3, 5, and 7) were each injected into an FFS cell to obtain an FFS device. Each of the liquid crystal devices was irradiated with a backlight (brightness: 25000 cd) using a white LED for 1000 hours and then driven at a frame frequency of 1 (HZ), and evaluated according to the following flickering evaluation criteria (BL of Tables 2, 4 and 6 Blinking of display after investigation).

And evaluated visually from the panel through various ND filters. Evaluation criteria were evaluated in four stages of?,?,?, And?. ◎ is the best flicker. The compositions of the liquid crystal compositions of Examples 1 to 15 and the liquid crystal compositions of Comparative Examples 1 to 4 and their physical properties and flicker evaluation results thereof are shown in Tables 2, 4 and 6 below.

◎: Flicker (blinking) can not be visually confirmed on the panel observed through the ND100 filter.

○: Flicker (blinking) can not be visually confirmed on the panel observed through the ND50 filter.

△: Flicker (blinking) can not be visually confirmed on the panel observed through the ND30 filter.

×: Flicker (blinking) can not be visually confirmed on the panel observed through the ND10 filter.

Here, the ND filter is an abbreviation of Neutral Density filter, and indicates a filter that changes the transmittance of light without changing the color. The ND100 represents a transmittance of 100% (i.e., no ND filter and 100% transmittance of light), and ND10 represents a transmittance of 10%. It can be said that the state in which the flicker can be visually observed through the ND filter having a small transmittance shows a state in which the flicker of light is large.

The evaluation of the VHR was carried out by using a backlight (luminous intensity: 25000 cd) using a white LED under the conditions of 1 V, 0.6 Hz and 25 캜 using LCM-2 manufactured by Toyotecnica, The liquid crystal compositions of Examples 1 to 15 and the liquid crystal compositions of Comparative Examples 1 to 4 were measured.

In contrast to Examples 1 to 15 and Comparative Examples 1 to 4, in the liquid crystal display device using the liquid crystal composition containing no condensed ring, flickering of the display could not be confirmed by the ND50 filter or the ND100 filter.

1, 8: polarizing plate 2: first substrate
3: electrode layer (first electrode) 3 ': common electrode (second electrode)
4: Orientation film 5: Liquid crystal layer
6: color filter 7: second substrate
11: gate electrode 12: gate insulating film
13: semiconductor layer 14: insulating layer
15: ohmic contact layer 16: drain electrode
17: source electrode 18: insulating protection layer
19b: source electrode 21: pixel electrode
22: common electrode 23: storage capacitor
24: drain electrode 25: source bus line
26: gate bus line 27: source electrode
28: gate electrode 29: common line

Claims

A first transparent substrate,
A second transparent substrate facing the first transparent substrate,
A liquid crystal layer containing a liquid crystal composition filled between the first transparent substrate and the second transparent substrate;
A pixel electrode arranged on the first transparent substrate,
And a display processing unit for controlling the frame frequency of the image signal to the pixel electrode in a range of 0 Hz to 59 Hz or less,
Wherein the liquid crystal composition is represented by the following general formula (i):

( ^Wherein R ⁱ¹ and R ⁱ² each independently represent an alkyl group of 1 to 10 carbon atoms, and at least one of -CH ₂ - in the alkyl group or the non-adjacent alkyl group is independently -CH = CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-,
A ⁱ¹ and A ⁱ² are each independently
(a) a 1,4-cyclohexylene group (one -CH ₂ - present in this group or two or more non-adjacent -CH ₂ - groups may be substituted with -O-) and
(b) 1,4-phenylene group (one -CH = in this group or two or more non-adjacent -CH = may be replaced by -N =).
(c) 1,4-cyclohexenylene group
(B) and (c) each independently represent a group selected from the group consisting of a cyano group, a fluorine atom and a chlorine atom,
Z ⁱ¹ and Z ⁱ² each independently represent a single bond, -OCH ₂ -, -CH ₂ O-, -OCF ₂ -, -CF ₂ O-, -CH ₂ CH ₂ - or -CF ₂ CF ₂ -
m ⁱ¹ and m ⁱ² each independently represent an integer of 0 to 3, where m ⁱ¹ + m ⁱ² are each independently 1, 2 or 3, and when a plurality of A ⁱ¹ to A ⁱ² and Z ⁱ¹ to Z ⁱ² exist, They may be the same or different.). &Lt; / RTI >

The method according to claim 1,
A first drive mode for driving at a first frame frequency,
And a second drive mode in which a rest period by intermittent drive is set, and switches the first drive mode and the second drive mode in the display processing unit.

The method according to claim 1,
A first drive mode for driving at a first frame frequency,
And a third drive mode driven at a second frame frequency lower than the first frame frequency, wherein the first drive mode and the third drive mode are switched by the display processing unit.

The method according to any one of claims 1 to 3,
Wherein the alignment layer has an orientation film layer for inducing a homogeneous orientation between the liquid crystal layer and the first transparent substrate and the second transparent substrate, respectively, and the alignment direction of each alignment film is parallel to the first or second transparent substrate And a common electrode is disposed on the first substrate.

The method according to any one of claims 1 to 4,
Wherein a distance between the first electrode and the second electrode is smaller than a distance G between the first substrate and the second substrate and a fringing electric field is formed between the pixel electrode and the common electrode. .

The method according to claim 1,
Wherein the liquid crystal layer has an alignment film layer between each of the first transparent substrate and the second transparent substrate, and a common electrode is disposed on the second substrate.

The method according to any one of claims 1 to 4,
In addition, the compound of formula (iii)

( ^Wherein R ⁱⁱⁱ¹ and R ⁱⁱⁱ² each independently represent an alkyl group having 1 to 8 carbon atoms, and one or two or more -CH ₂ - groups in the group are not particularly limited, -CH═CH-, -CO-, -OCO-, -COO-, -C≡C-, -CF ₂ O- or -OCF ₂ -, and one or two or more hydrogen atoms May be independently substituted with a fluorine atom or a chlorine atom, and each of ^Aiiii to ^Aiiii independently represents
(a) a 1,4-cyclohexylene group (one -CH ₂ - present in the group or two or more non-adjacent -CH ₂ - groups may be substituted with -O- or -S-)
(b) a 1,4-phenylene group (one -CH = in the group or two or more non-adjacent -CH = groups may be replaced by -N =, and a hydrogen atom present in the group may be replaced by a fluorine atom Or a chlorine atom, provided that at least one of adjacent -CH = represents a hydrogen atom.)
Z ⁱⁱⁱ¹ and Z ⁱⁱⁱ² each independently represent a group selected from the group consisting of a single bond, -CH = CH-, ^-C≡C- , -CH ₂ CH ₂ -, - (CH ₂ ) ₄ -, -OCH ₂ -, -CH ₂ O-, -OCF ₂ - or -CF ₂ O-, m ⁱⁱⁱ¹ represents an integer of 0 to 2, and when a plurality of A ⁱⁱⁱ¹ and Z ⁱⁱⁱ¹ exist, they may be the same or different You can. With the proviso that the compound represented by the general formula (i) is excluded).