WO2014136315A1 - ネマチック液晶組成物及びこれを用いた液晶表示素子 - Google Patents
ネマチック液晶組成物及びこれを用いた液晶表示素子 Download PDFInfo
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- WO2014136315A1 WO2014136315A1 PCT/JP2013/079561 JP2013079561W WO2014136315A1 WO 2014136315 A1 WO2014136315 A1 WO 2014136315A1 JP 2013079561 W JP2013079561 W JP 2013079561W WO 2014136315 A1 WO2014136315 A1 WO 2014136315A1
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- 0 CC(C)(*)C(CC1)CCC1C(C)(C)c(cc1)c(*)c(*2)c1-c1c2c(*)c(*)cc1 Chemical compound CC(C)(*)C(CC1)CCC1C(C)(C)c(cc1)c(*)c(*2)c1-c1c2c(*)c(*)cc1 0.000 description 1
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- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
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- C09K19/12—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings at least two benzene rings directly linked, e.g. biphenyls
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- C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
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- C09K19/3001—Cyclohexane rings
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- C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
- C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
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- G02F1/0045—Liquid crystals characterised by their physical properties
Definitions
- the present invention relates to a nematic liquid crystal composition having a negative dielectric anisotropy ( ⁇ ) useful as a liquid crystal display material, and a liquid crystal display device using the same.
- Liquid crystal display elements are used in various measuring instruments, automobile panels, word processors, electronic notebooks, printers, computers, televisions, watches, advertisement display boards, etc., including clocks and calculators.
- Typical liquid crystal display methods include TN (twisted nematic) type, STN (super twisted nematic) type, VA (vertical alignment) type using TFT (thin film transistor), and IPS (in-plane Switching) type.
- the liquid crystal composition used in these liquid crystal display elements is stable against external factors such as moisture, air, heat, light, etc., and exhibits a liquid crystal phase in the widest possible temperature range centering on room temperature, and has low viscosity. And a low driving voltage is required.
- the liquid crystal composition has several to several tens of kinds of compounds in order to optimize the dielectric anisotropy ( ⁇ ) and the refractive index anisotropy ( ⁇ n) for each display element. It is composed of
- a liquid crystal composition having a negative ⁇ is used, which is widely used for a liquid crystal TV or the like.
- low voltage driving, high-speed response, and a wide operating temperature range are required in all driving systems. That is, the absolute value of ⁇ is large, the viscosity ( ⁇ ) is small, and a high nematic phase-isotropic liquid phase transition temperature (T ni ) is required.
- T ni nematic phase-isotropic liquid phase transition temperature
- Patent Documents 1 and 2 have already disclosed liquid crystal compositions using a compound having a terphenyl structure substituted with fluorine.
- the liquid crystal composition needs to be free from defects in display quality in order to be practically used in a liquid crystal display element.
- a liquid crystal composition used for an active matrix drive liquid crystal display element driven by a TFT element or the like needs to have a high specific resistance value or a high voltage holding ratio.
- an antioxidant for improving stability to heat and a liquid crystal composition using the same have been disclosed (see Patent Document 3 and Patent Document 4), but this is not necessarily sufficient.
- the liquid crystal compound having a large ⁇ n is relatively inferior in stability to light and heat, the quality stability in such a composition cannot be said to be sufficient.
- liquid crystal display elements has expanded, and there has been a great change in the method of use and manufacturing, and in order to respond to these characteristics, characteristics other than the basic physical property values as conventionally known are required. It has come to be required to optimize.
- VA vertical alignment
- IPS in-plane switching
- the size thereof is an ultra-large size display element of 50 type or more. Came to be used until practical use.
- ODF One ⁇ ⁇ Drop Fill
- PS liquid crystal display elements polymer stabilized, polymer stabilized
- PSA liquid crystal display elements polymer sustained alignment, polymer sustaining alignment
- the drop mark problem is a larger problem (see Patent Document 6). That is, these display elements are characterized by adding a monomer to a liquid crystal composition and curing the monomer in the composition. In many cases, the monomer is cured by irradiating the composition with ultraviolet rays.
- JP 2003-327965 A WO2007 / 077872 JP-A-9-124529 JP 2006-169472 A JP-A-6-235925 JP 2002-357830 A
- the problems to be solved by the present invention include a liquid crystal phase in a wide temperature range, low viscosity, good solubility at low temperatures, high specific resistance and voltage holding ratio, and stability against heat and light.
- the object is to provide a liquid crystal display element such as a VA type or a PSVA type, which has a negative ⁇ liquid crystal composition and is excellent in display quality by using this liquid crystal composition, and hardly causes display defects such as image sticking and dripping marks. .
- a liquid crystal composition containing a compound having a biphenyl moiety having a polar group as a constituent component the above-mentioned problems are solved.
- R 1 represents a linear or branched alkyl group having 1 to 24 carbon atoms, and one or more CH 2 groups in the alkyl group are not directly adjacent to an oxygen atom. And may be substituted with —O—, —CO—, —OCO— or —COO—, and M 1 represents a trans-1,4-cyclohexylene group, a 1,4-phenylene group or a single bond. Containing one or more compounds represented by As the second component, the general formula (II)
- R 21 to R 22 each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group or an alkenyl group having 2 to 10 carbon atoms, and X 21 to X 24 are each independently hydrogen.
- R 21 to R 22 each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group or an alkenyl group having 2 to 10 carbon atoms
- X 21 to X 24 are each independently hydrogen.
- a nematic liquid crystal composition is provided, and a liquid crystal display device using the liquid crystal composition is provided.
- the liquid crystal composition having a negative ⁇ of the present invention can obtain a significantly low viscosity, has good solubility at low temperatures, and has a very small change in specific resistance and voltage holding ratio due to heat and light.
- the VA type and PSVA type liquid crystal display elements using this are very useful because they can achieve high-speed response and display defects are suppressed.
- R 1 represents a straight-chain alkyl group or a branched-chain alkyl group having 1 to 24 carbon atoms, and one or two or more CH 2 groups in the alkyl group have a direct oxygen atom.
- M 1 represents a trans-1,4-cyclohexylene group, a 1,4-phenylene group or a single bond, and a trans-1,4-cyclohexylene group or a 1,4-phenylene group is preferable.
- the compound represented by the general formula (I) is preferably a compound represented by the following general formula (Ia) to general formula (Id).
- R 11 is preferably a linear alkyl group or branched alkyl group having 1 to 10 carbon atoms
- R 12 is preferably a linear alkyl group or branched alkyl group having 1 to 20 carbon atoms
- R 13 is preferably a linear alkyl group having 1 to 8 carbon atoms, a branched alkyl group, a linear alkoxy group or a branched alkoxy group
- L 1 is a linear alkylene group or branched alkylene having 1 to 8 carbon atoms.
- Groups are preferred.
- the compounds represented by the general formulas (Ia) to (Id) the compounds represented by the general formula (Ic) and the general formula (Id) are more preferable.
- the compound represented by formula (I) contains one or two compounds, preferably one to five compounds, more preferably 0.001.
- the content is preferably 1% by mass, more preferably 0.001 to 0.1% by mass, and particularly preferably 0.001 to 0.05% by mass.
- R 21 to R 22 each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group, or an alkenyl group having 2 to 10 carbon atoms.
- X 21 to X 24 each independently represent a hydrogen atom or a fluorine atom, but at least one represents a fluorine atom.
- the compound represented by the general formula (II) is preferably a compound represented by the following general formula (II-a) to general formula (II-f).
- R 21 to R 22 each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group, or an alkenyl group having 2 to 10 carbon atoms.
- general formula (II-a) to general formula (II-f) are more preferable.
- the present invention contains at least one compound represented by the general formula (II), preferably 1 to 10 compounds, particularly preferably 1 to 5 compounds, and its content is 5 To 50% by mass, preferably 5 to 40% by mass.
- the liquid crystal composition of the present invention further has a general formula (III)
- R 31 to R 32 each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group, or an alkenyl group having 2 to 10 carbon atoms.
- M 31 represents a trans-1,4-cyclohexylene group.
- L 31 represents a single bond, —CH 2 CH 2 — or —CH 2 O—.
- n 31 represents 0 or 1;
- the compound represented by the general formula (III) can be contained, preferably 1 to 10 kinds, more preferably 1 to 8 kinds, particularly preferably 5 to Preferably it is 50% by weight, more preferably 5 to 30% by weight.
- the liquid crystal composition of the present invention may further be represented by formulas (IV-a) to (IV-d):
- the compound chosen from the compound group represented by these can be contained.
- R 41 to R 48 each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group, or an alkenyl group having 2 to 10 carbon atoms.
- a compound selected from the group of compounds represented by formulas (IV-a) to (IV-d) can be contained, preferably 1 to 10 types, preferably 1 to It is particularly preferable to contain 8 types, and the content is preferably 5 to 80% by mass, more preferably 10 to 70% by mass, and particularly preferably 20 to 60% by mass.
- the liquid crystal composition of the present invention is represented by general formula (I), general formula (II), general formula (III), general formula (IV-a) to general formula (IV-d) and general formula (V).
- the total content of the compounds is preferably 90 to 100% by mass, more preferably 95 to 100% by mass.
- ⁇ at 25 ° C. is ⁇ 2.0 to ⁇ 6.0, more preferably ⁇ 2.0 to ⁇ 5.5.
- ⁇ n at 25 ° C. is 0.08 to 0.14, more preferably 0.09 to 0.13, and particularly preferably 0.09 to 0.12. More specifically, it is preferably 0.10 to 0.13 when dealing with a thin cell gap, and preferably 0.08 to 0.10 when dealing with a thick cell gap.
- the ⁇ at 20 ° C. is 10 to 30 mPa ⁇ s, more preferably 10 to 25 mPa ⁇ s, and particularly preferably 10 to 22 mPa ⁇ s.
- T ni is 60 ° C. to 120 ° C., more preferably 70 ° C. to 100 ° C., and particularly preferably 70 ° C. to 85 ° C.
- the liquid crystal composition of the present invention may contain a normal nematic liquid crystal, a smectic liquid crystal, a cholesteric liquid crystal, a polymerizable monomer, etc. in addition to the above-mentioned compounds.
- the liquid crystal composition of the present invention may contain a polymerizable compound in order to produce a liquid crystal display element such as a PS mode, a PSA mode, or a PSVA mode.
- a polymerizable compound such as a PS mode, a PSA mode, or a PSVA mode.
- the polymerizable compound that can be used include a photopolymerizable monomer that undergoes polymerization by energy rays such as light.
- the structure has, for example, a liquid crystal skeleton in which a plurality of six-membered rings such as biphenyl derivatives and terphenyl derivatives are connected. Examples thereof include a polymerizable compound. More specifically, the general formula (V)
- X 51 and X 52 each independently represent a hydrogen atom or a methyl group
- Sp 1 and Sp 2 are each independently a single bond, an alkylene group having 1 to 8 carbon atoms, or —O— (CH 2 ) s —.
- Z 51 represents —OCH 2 —, —CH 2 O—, —COO—, —OCO—, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2 —, —CH ⁇ CH—COO—, —CH ⁇ CH—OCO—, —COO—CH ⁇ CH—, —OCO—CH ⁇ CH—, —COO—CH 2 CH 2 —, —OCO—CH 2 CH 2 —, —CH 2 CH 2 —COO—, —CH 2 CH 2 —OCO—, —COO—CH 2 —, —OCO—CH 2 —, —CH 2 —COO—, —CH 2 CH 2 —OCO—, —COO—CH 2 —, —OCO—CH 2 —, —CH 2 —COO—, —CH 2 —OCO—, —CY 1 ⁇ CY 2 — (Wherein Y 1 and Y 2
- X 51 and X 52 are each preferably a diacrylate derivative that represents a hydrogen atom, or a dimethacrylate derivative that has a methyl group, and a compound in which one represents a hydrogen atom and the other represents a methyl group.
- diacrylate derivatives are the fastest, dimethacrylate derivatives are slow, asymmetric compounds are in the middle, and a preferred embodiment can be used depending on the application.
- a dimethacrylate derivative is particularly preferable.
- Sp 1 and Sp 2 each independently represent a single bond, an alkylene group having 1 to 8 carbon atoms or —O— (CH 2 ) s —, but at least one of them is a single bond in a PSA display element.
- a compound in which both represent a single bond or one in which one represents a single bond and the other represents an alkylene group having 1 to 8 carbon atoms or —O— (CH 2 ) s — is preferable.
- 1 to 4 alkyl groups are preferable, and s is preferably 1 to 4.
- Z 51 is —OCH 2 —, —CH 2 O—, —COO—, —OCO—, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2 — or a single bond
- —COO—, —OCO— or a single bond is more preferred, and a single bond is particularly preferred.
- M 51 represents a 1,4-phenylene group, a trans-1,4-cyclohexylene group or a single bond in which any hydrogen atom may be substituted by a fluorine atom, but a 1,4-phenylene group or a single bond is preferred.
- C represents a ring structure other than a single bond
- Z 51 is preferably a linking group other than a single bond.
- M 51 is a single bond
- Z 51 is preferably a single bond.
- the ring structure between Sp 1 and Sp 2 is specifically preferably the structure described below.
- both ends shall be bonded to Sp 1 or Sp 2.
- the polymerizable compounds containing these skeletons are optimal for PSA-type liquid crystal display elements because of the alignment regulating power after polymerization, and a good alignment state can be obtained, so that display unevenness is suppressed or does not occur at all.
- general formula (V-1) to general formula (V-4) are particularly preferable, and general formula (V-2) is most preferable.
- the polymerization proceeds even when no polymerization initiator is present, but may contain a polymerization initiator in order to accelerate the polymerization.
- the polymerization initiator include benzoin ethers, benzophenones, acetophenones, benzyl ketals, acylphosphine oxides, and the like.
- the liquid crystal composition containing the polymerizable compound of the present invention is provided with liquid crystal alignment ability by polymerizing the polymerizable compound contained therein by ultraviolet irradiation, and transmits light through the birefringence of the liquid crystal composition. It is used in a liquid crystal display element that controls As liquid crystal display elements, AM-LCD (active matrix liquid crystal display element), TN (nematic liquid crystal display element), STN-LCD (super twisted nematic liquid crystal display element), OCB-LCD and IPS-LCD (in-plane switching liquid crystal display element) However, it is particularly useful for AM-LCDs and can be used for transmissive or reflective liquid crystal display elements.
- the two substrates of the liquid crystal cell used in the liquid crystal display element can be made of a transparent material having flexibility such as glass or plastic, and one of them can be an opaque material such as silicon.
- a transparent substrate having a transparent electrode layer can be obtained, for example, by sputtering indium tin oxide (ITO) on a transparent substrate such as a glass plate.
- the color filter can be prepared by, for example, a pigment dispersion method, a printing method, an electrodeposition method, or a dyeing method.
- a method for producing a color filter by a pigment dispersion method will be described as an example.
- a curable coloring composition for a color filter is applied on the transparent substrate, subjected to patterning treatment, and cured by heating or light irradiation. By performing this process for each of the three colors red, green, and blue, a pixel portion for a color filter can be created.
- a pixel electrode provided with an active element such as a TFT, a thin film diode, or a metal insulator metal specific resistance element may be provided on the substrate.
- the substrate is opposed so that the transparent electrode layer is on the inside.
- the thickness of the obtained light control layer is 1 to 100 ⁇ m. More preferably, the thickness is 1.5 to 10 ⁇ m.
- the polarizing plate it is preferable to adjust the product of the refractive index anisotropy ⁇ n of the liquid crystal and the cell thickness d so that the contrast is maximized.
- the polarizing axis of each polarizing plate can be adjusted so that the viewing angle and contrast are good.
- a retardation film for widening the viewing angle can also be used.
- the spacer examples include glass particles, plastic particles, alumina particles, and a photoresist material.
- a sealant such as an epoxy thermosetting composition is screen-printed on the substrates with a liquid crystal inlet provided, the substrates are bonded together, and heated to thermally cure the sealant.
- a normal vacuum injection method or an ODF method can be used as a method of sandwiching the polymerizable compound-containing liquid crystal composition between two substrates. Although it has the subject which remains after, in this invention, it can use suitably by the display element manufactured using ODF method.
- an appropriate polymerization rate is desirable in order to obtain good alignment performance of liquid crystals. Therefore, active energy rays such as ultraviolet rays or electron beams are irradiated singly or in combination or sequentially.
- the method of polymerizing by is preferred.
- ultraviolet rays When ultraviolet rays are used, a polarized light source or a non-polarized light source may be used.
- the polymerization is performed in a state where the polymerizable compound-containing liquid crystal composition is sandwiched between two substrates, at least the substrate on the irradiation surface side must be given appropriate transparency to the active energy rays. I must.
- the orientation state of the unpolymerized part is changed by changing conditions such as an electric field, a magnetic field, or temperature, and further irradiation with active energy rays is performed. Then, it is possible to use a means for polymerization.
- a means for polymerization In particular, when ultraviolet exposure is performed, it is preferable to perform ultraviolet exposure while applying an alternating electric field to the polymerizable compound-containing liquid crystal composition.
- the alternating electric field to be applied is preferably an alternating current having a frequency of 10 Hz to 10 kHz, more preferably a frequency of 60 Hz to 10 kHz, and the voltage is selected depending on a desired pretilt angle of the liquid crystal display element. That is, the pretilt angle of the liquid crystal display element can be controlled by the applied voltage. In the MVA mode liquid crystal display element, the pretilt angle is preferably controlled from 80 degrees to 89.9 degrees from the viewpoint of alignment stability and contrast.
- the temperature during irradiation is preferably within a temperature range in which the liquid crystal state of the liquid crystal composition of the present invention is maintained. Polymerization is preferably performed at a temperature close to room temperature, that is, typically at a temperature of 15 to 35 ° C.
- a lamp for generating ultraviolet rays a metal halide lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, or the like can be used.
- a wavelength of the ultraviolet-rays to irradiate it is preferable to irradiate the ultraviolet-ray of the wavelength range which is not the absorption wavelength range of a liquid crystal composition, and it is preferable to cut and use an ultraviolet-ray as needed.
- Intensity of ultraviolet irradiation is preferably from 0.1mW / cm 2 ⁇ 100W / cm 2, 2mW / cm 2 ⁇ 50W / cm 2 is more preferable.
- the amount of energy of ultraviolet rays to be irradiated can be adjusted as appropriate, but is preferably 10 mJ / cm 2 to 500 J / cm 2, and more preferably 100 mJ / cm 2 to 200 J / cm 2 .
- the intensity may be changed.
- the time for irradiating with ultraviolet rays is appropriately selected depending on the intensity of the irradiated ultraviolet rays, but is preferably from 10 seconds to 3600 seconds, and more preferably from 10 seconds to 600 seconds.
- the liquid crystal display device using the liquid crystal composition of the present invention is useful for achieving both high-speed response and suppression of display failure, and is particularly useful for a liquid crystal display device for active matrix driving, including VA mode, PSVA mode, It can be applied to PSA mode, IPS mode or ECB mode liquid crystal display elements.
- the measured characteristics are as follows.
- T ni Nematic phase-isotropic liquid phase transition temperature (° C.) ⁇ n: Refractive index anisotropy at 20 ° C. ⁇ : Dielectric anisotropy at 20 ° C. ⁇ : Viscosity at 20 ° C. (mPa ⁇ s) ⁇ 1: rotational viscosity at 20 ° C. (mPa ⁇ s) VHR: Voltage holding ratio (%) at 50 ° C. under conditions of frequency 60 Hz and applied voltage 5 V Burn-in: The burn-in evaluation of the liquid crystal display element is based on the following four-level evaluation of the afterimage level of the fixed pattern when the predetermined fixed pattern is displayed in the display area for 1200 hours and then the entire screen is uniformly displayed. went.
- Example 1 A liquid crystal composition LC-1 shown below was prepared and measured for physical properties. The results are shown in the following table.
- a liquid crystal composition LCM-1 was prepared by adding 0.03% of the compound represented by formula (II).
- the physical property value was almost the same as LC-1.
- the initial VHR of the liquid crystal composition LCM-1 was 98.7%, whereas the VHR after standing at high temperature for 1 hour at 150 ° C. was 98.5%.
- a VA liquid crystal display device was produced using the liquid crystal composition LCM-1, and the image sticking and the drop mark were measured by the above-described method. As a result, the following excellent results were shown.
- Example 1 Comparative Example 1
- the initial VHR of the liquid crystal composition LC-1 to which the compound represented by the formula (Ic-1) described in Example 1 was not added was 98.5%, while 1 at 150 ° C.
- VHR after standing at high temperature for 8 hours was 86.7%, which was greatly reduced from the initial stage.
- a VA liquid crystal display element was produced using the liquid crystal composition LC-1, and the image sticking and the dropping trace were measured by the above-described method. As a result, the results were inferior to those of Example 1 as shown below.
- a liquid crystal composition LCM-2 was prepared by adding 0.03% of the compound represented by the formula (Ic-1) to 99.97% of the liquid crystal composition LC-A.
- the physical property value was almost the same as LC-A.
- the liquid crystal composition LCM-2 not containing the compound represented by the general formula (II) has a viscosity ⁇ and a rotational viscosity ⁇ 1 compared to the liquid crystal composition LCM-1 containing the compound represented by the general formula (II).
- the initial VHR of the liquid crystal composition LCM-2 was 98.3%, whereas the VHR after standing at high temperature for 1 hour at 150 ° C. was 95.9%.
- a VA liquid crystal display element was prepared using the liquid crystal composition LCM-2, and the image sticking and the drop mark were measured by the above-described method. As a result, the results were inferior to those of Example 1 as shown below.
- Example 2 As a result of measuring the response speed using a cell with ITO coated with a polyimide alignment film that induces homeotropic alignment with a cell gap of 3.5 ⁇ m, the response speed is 5.3 ms, which is compared with LCM-1 described in Example 1. It was inferior.
- Example 2 to Example 4 The following liquid crystal compositions LC-2 to LC-4 were prepared and their physical properties were measured. The results are shown in the following table.
- Example 5 A liquid crystal composition LC-5 shown below was prepared and measured for physical properties. The results are shown in the following table.
- a liquid crystal composition LCM-6 was prepared by adding 0.03% of the compound represented by the formula (Ic-1) to 99.97% of the liquid crystal composition LC-5.
- the physical property values were almost the same as before the addition.
- the initial VHR of the liquid crystal composition LCM-6 and the VHR after standing at 150 ° C. for 1 hour at high temperature were almost unchanged. Further, when the burn-in and dropping traces of the VA liquid crystal display device produced using the liquid crystal composition LCM-6 were measured, excellent results were shown as follows.
- Example 6 For each of 99.97% of the liquid crystal composition LC-1 described in Example 1 and LC-5 described in Example 5, the compound represented by the formula (Ia-1)
- the liquid crystal compositions LCM-7 and LCM-8 were prepared by adding 0.03% of the compound represented by formula (I). The physical property values were almost the same as before the addition. The initial VHR of the liquid crystal compositions LCM-7 and LCM-8 and the VHR after standing at high temperature for 1 hour at 150 ° C. were almost unchanged. Further, when the burn-in and dropping traces of the VA liquid crystal display device manufactured using the liquid crystal compositions LCM-7 and LCM-8 were measured, the following excellent results were shown.
- a liquid crystal composition LCM-9 was prepared by adding 0.03% of a compound represented by the formula: The physical property values were almost the same as before the addition. The initial VHR of the liquid crystal composition LCM-9 and the VHR after standing at 150 ° C. for 1 hour at high temperature were almost unchanged. Further, when the burn-in and dropping traces of the VA liquid crystal display device manufactured using the liquid crystal composition LCM-9 were measured, excellent results were shown as follows.
- Example 9 With respect to 99.7% of the liquid crystal composition LCM-1 described in Example 1,
- a polymerizable liquid crystal composition CLCM-1 is prepared by adding 0.3% of a polymerizable compound represented by formula (II) and uniformly dissolving, and inducing homeotropic alignment with a cell gap of 3.5 ⁇ m. It inject
- a polymerizable liquid crystal composition CLCM-2 and CLCM-3 were respectively prepared by adding 0.3% of a polymerizable compound represented by formula (II) and uniformly dissolving, and the polymerizable liquid crystal composition was prepared with a cell gap of 3.5 ⁇ m. It injected by the vacuum injection method to the cell with ITO which apply
- Example 10 to Example 13 For 99.7% of each of the liquid crystal compositions LCM-3 to 5 described in Examples 2 to 4,
- a polymerizable liquid crystal composition CLCM-4, CLCM-5 and CLCM-6 were prepared by adding 0.3% of a polymerizable compound represented by the formula (1) and uniformly dissolving, respectively. It injected by the vacuum injection method to the cell with ITO which apply
- Each of liquid crystal compositions LC-6 to 29 is 99.97% of formula (Ic-1)
- the liquid crystal compositions LCM-7 to LCM-30 were prepared by adding 0.03% of the compound represented by formula (I). In the same manner as in Example 1, even when the compound represented by the formula (Ic-1) was added, the physical property values thereof hardly changed compared with those before the addition.
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Abstract
Description
第一成分として、一般式(I)
第二成分として、一般式(II)
本願発明の液晶組成物において、一般式(I)で表される化合物を1種又は2種を含有するが好ましく、1種から5種含有することが更に好ましく、その含有量は0.001から1質量%であることが好ましく、0.001から0.1質量%が更に好ましく、0.001から0.05質量%が特に好ましい。
第二成分として使用する一般式(II)
一般式(II-a)から一般式(II-f)で表される化合物中、一般式(II-a)、一般式(II-c)及び一般式(II-d)が更に好ましい。
一般式(III)で表される化合物において、R31~R32はお互い独立しては炭素原子数1から10のアルキル基、アルコキシ基、又は炭素原子数2から10のアルケニル基を表す。M31はトランス-1,4-シクロへキシレン基を表す。L31は単結合、-CH2CH2-又は、-CH2O-を表す。n31は0又は1を表す。
本願発明の液晶組成物は、また更に、一般式(IV-a)から一般式(IV-d)
(式中、R41~R48はお互い独立しては炭素原子数1から10のアルキル基、アルコキシ基又は炭素原子数2から10のアルケニル基を表す。)
本願発明では一般式(IV-a)から一般式(IV-d)で表される化合物群から選ばれる化合物を含有することができるが、1種~10種含有することが好ましく、1種~8種含有することが特に好ましく、その含有量は5から80質量%であることが好ましく、10から70質量%であることが更に好ましく、20から60質量%であることが特に好ましい。
Sp1及びSp2はそれぞれ独立して、単結合、炭素原子数1~8のアルキレン基又は-O-(CH2)s-
(式中、sは2から7の整数を表し、酸素原子は芳香環に結合するものとする。)を表し、
Z51は-OCH2-、-CH2O-、-COO-、-OCO-、-CF2O-、-OCF2-、-CH2CH2-、-CF2CF2-、-CH=CH-COO-、-CH=CH-OCO-、-COO-CH=CH-、-OCO-CH=CH-、-COO-CH2CH2-、-OCO-CH2CH2-、-CH2CH2-COO-、-CH2CH2-OCO-、-COO-CH2-、-OCO-CH2-、-CH2-COO-、-CH2-OCO-、-CY1=CY2-(式中、Y1及びY2はそれぞれ独立して、フッ素原子又は水素原子を表す。)、-C≡C-又は単結合を表し、
M51は1,4-フェニレン基、トランスー1,4-シクロヘキシレン基又は単結合を表し、式中の全ての1,4-フェニレン基は、任意の水素原子がフッ素原子により置換されていても良い。)で表される二官能モノマーが好ましい。
これらの骨格を含む重合性化合物は重合後の配向規制力がPSA型液晶表示素子に最適であり、良好な配向状態が得られることから、表示ムラが抑制されるか、又は、全く発生しない。
本発明の液晶組成物にモノマーを添加する場合において、重合開始剤が存在しない場合でも重合は進行するが、重合を促進するために重合開始剤を含有していてもよい。重合開始剤としては、ベンゾインエーテル類、ベンゾフェノン類、アセトフェノン類、ベンジルケタール類、アシルフォスフィンオキサイド類等が挙げられる。
Δn :20℃における屈折率異方性
Δε :20℃における誘電率異方性
η :20℃における粘度(mPa・s)
γ1 :20℃における回転粘性(mPa・s)
VHR:周波数60Hz,印加電圧5Vの条件下で50℃における電圧保持率(%)
焼き付き:
液晶表示素子の焼き付き評価は、表示エリア内に所定の固定パターンを1200時間表示させた後に、全画面均一な表示を行ったときの固定パターンの残像のレベルを目視にて以下の4段階評価で行った。
○残像ごく僅かに有るも許容できるレベル
△残像有り許容できないレベル
×残像有りかなり劣悪
滴下痕 :
液晶表示装置の滴下痕の評価は、全面黒表示した場合における白く浮かび上がる滴下痕を目視にて以下の4段階評価で行った。
○残像ごく僅かに有るも許容できるレベル
△残像有り許容できないレベル
×残像有りかなり劣悪
尚、実施例において化合物の記載について以下の略号を用いる。
(側鎖)
-n -CnH2n+1 炭素原子数nの直鎖状アルキル基
n- CnH2n+1- 炭素原子数nの直鎖状アルキル基
-On -OCnH2n+1 炭素原子数nの直鎖状アルコキシ基
-V -CH=CH2
V- CH2=CH-
-V1 -CH=CH-CH3
-2V1 -CH2-CH2-CH=CH-CH3
V2- CH2=CH-CH2-CH2-
(環構造)
以下に示される液晶組成物LC-1を調製し、その物性値を測定した。この結果を次の表に示す。
(比較例1)
実施例1に記載の式(I-c-1)で表される化合物を添加していない液晶組成物LC-1の初期のVHRは98.5%であったのに対し、150℃で1時間の高温放置後のVHRは、86.7%と初期に対して大きく低下した。
また、液晶組成物LC-1を用いてVA液晶表示素子を作製し、前述の方法により焼き付き及び滴下痕の測定したところ、以下に示すように実施例1と比べて劣る結果を示した。
一般式(II)で表される化合物を含有しない、以下に示される液晶組成物LC-Aを調製し、物性値を測定した。
また、液晶組成物LCM-2を用いてVA液晶表示素子を作製し、前述の方法により焼き付き及び滴下痕の測定したところ、以下に示すように実施例1に比べて劣る結果を示した。
(実施例2から実施例4)
次に示す液晶組成物LC-2~LC-4を調製し、その物性値を測定した。この結果を次の表に示す。
液晶組成物LCM-3~LCM-5の初期のVHR及び150℃で1時間の高温放置後のVHRはほとんど変化がなかった。また、液晶組成物LCM-3~LCM-5を用いて作製したVA液晶表示素子の焼き付き及び滴下痕の測定したところ、以下に示すように優れた結果を示した。
次に示す液晶組成物LC-5を調製し、その物性値を測定した。この結果を次の表に示す。
液晶組成物LCM-6の初期のVHR及び150℃で1時間の高温放置後のVHRはほとんど変化がなかった。また、液晶組成物LCM-6を用いて作製したVA液晶表示素子の焼き付き及び滴下痕の測定したところ、以下に示すように優れた結果を示した。
実施例1に記載の液晶組成物LC-1及び実施例5に記載のLC-5の各々99.97%に対して、式(I-a-1)
液晶組成物LCM-7及びLCM-8の初期のVHR及び150℃で1時間の高温放置後のVHRはほとんど変化がなかった。また、液晶組成物LCM-7及びLCM-8を用いて作製したVA液晶表示素子の焼き付き及び滴下痕の測定したところ、以下に示すように優れた結果を示した。
実施例1に記載の液晶組成物LC-1 99.97%に対して、式(I-b-1)
液晶組成物LCM-9の初期のVHR及び150℃で1時間の高温放置後のVHRはほとんど変化がなかった。また、液晶組成物LCM-9を用いて作製したVA液晶表示素子の焼き付き及び滴下痕の測定したところ、以下に示すように優れた結果を示した。
実施例1に記載の液晶組成物LCM-1 99.7%に対して、
比較例1で使用した液晶組成物LC-1及び比較例2で使用したLCM-2の各々99.7%に対して、
本液晶表示素子の焼き付き及び滴下痕の測定したところ、以下に示すように実施例9に比べて劣る結果を示した。
実施例2~4に記載の液晶組成物LCM-3~5の各々99.7%に対して、
(実施例14から実施例4)
次に示す液晶組成物LC-6~LC-29を調製し、その物性値を測定した。この結果を次の表に示す。
Claims (8)
- 第一成分として、一般式(I)
第二成分として、一般式(II)
- 一般式(I)において、R1が炭素原子数1から10の直鎖アルキル基又は分岐炭アルキル基を表し、M1はトランス-1,4-シクロへキシレン基又は1,4-フェニレン基を表す請求項1から3のいずれか一項に記載のネマチック液晶組成物。
- 一般式(I)で表される化合物の含有量が0.001質量%から1質量%であり、一般式(II)で表される化合物の含有量が5質量%から30質量%である請求項1から4のいずれか一項に記載のネマチック液晶組成物。
- 一般式(V)
Sp1及びSp2はそれぞれ独立して、単結合、炭素原子数1~8のアルキレン基又は-O-(CH2)s-
(式中、sは2から7の整数を表し、酸素原子は芳香環に結合するものとする。)を表し、
Z51は-OCH2-、-CH2O-、-COO-、-OCO-、-CF2O-、-OCF2-、-CH2CH2-、-CF2CF2-、-CH=CH-COO-、-CH=CH-OCO-、-COO-CH=CH-、-OCO-CH=CH-、-COO-CH2CH2-、-OCO-CH2CH2-、-CH2CH2-COO-、-CH2CH2-OCO-、-COO-CH2-、-OCO-CH2-、-CH2-COO-、-CH2-OCO-、-CY1=CY2-(式中、Y1及びY2はそれぞれ独立して、フッ素原子又は水素原子を表す。)、-C≡C-又は単結合を表し、
M51は1,4-フェニレン基、トランス-1,4-シクロヘキシレン基又は単結合を表し、式中の全ての1,4-フェニレン基は、任意の水素原子がフッ素原子により置換されていても良い。)で表される重合性化合物を含有する請求項1から5のいずれか一項に記載のネマチック液晶組成物。 - 透明導電性材料からなる共通電極を具備した第一の基板と、透明導電性材料からなる画素電極と各画素に具備した画素電極を制御する薄膜トランジスターを具備した第二の基板と、前記第一の基板と第二の基板間に挟持された液晶組成物を有し、該液晶組成物中の液晶分子の電圧無印加時の配向が前記基板に対して略垂直である液晶表示素子であって、該液晶組成物として請求項1から6のいずれか一項に記載のネマチック液晶組成物を用いた液晶表示素子。
- 請求項6に記載の重合性化合物を含有するネマチック液晶組成物を用い、電圧印加下あるいは電圧無印加下で該液晶組成物中に含有する重合性化合物を重合させて作製した高分子安定化モード液晶表示素子。
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