CN101846860B - Liquid crystal display member and image display device using same - Google Patents

Abstract

The invention provides a liquid crystal display member with a high light utilization efficiency and an display device using the same. The liquid crystal display member includes a first substrate (21) which at least includes a plurality of pixel electrodes (31, 32) and a switch member (39) that are laminated together; a second substrate which passes over the liquid crystal layer (12) to the first substrate and at least includes a public electrode (33) and a coloring layer (62) that are laminated together; and points disposed in an area surrounded by the grid wires (48) and the data wires, wherein a plurality of grid wires (48) on the first substrate (21) are parallelly arranged and uniformly spaced; and a plurality of data wires in a direction vertical to the grid wires (48) are parallelly arranged and uniformly spaced. Additionally, the point has a first opening (25) at least having a switch member (39) at a crossed position of grid wires (48) and data wires and a first pixel electrode (31) arranged by the switch member (39) and a second opening (26) at least having a second pixel electrode (32) and a control electrode (34).

Description

The image display of liquid crystal display cells and use liquid crystal display cells

The application based on and require the preference of the Japanese patent application No.2009-052006 that submits on March 5th, 2009, its content is all incorporated to by reference at this.

Technical field

The present invention relates to the image display of liquid crystal display cells and use liquid crystal display cells.

Background technology

In the field of the such information of the display such as personal computer and TV and image display, liquid crystal display (LCD) is widely distributed in recent years.In the trend and market of the technical development of liquid crystal display, along with the minimizing of pixel size, and realize more high definition and more high image quality is consistent, the size that liquid crystal display expands their screen becomes further important.This requires countless small pixel to be arranged on the screen of wider area, and development is towards the miromaching of large area screen.

On the other hand, for combining the projector of image display of the optical system of little image-displaying member (in to angular direction in size several inches or an inch or less liquid crystal display cells) and amplification and projects images, also become and become more and more popular.Projector not only in office for demonstrating but also at home for such as the such amusement of home theater.In liquid crystal display, the size that increases the screen of liquid crystal display cells keeps high-definition image to cause cost to increase simultaneously, yet the liquid crystal display cells that is applied to projector can have little screen and aspect cost, be therefore just quite favourable.

When the image in little image-displaying member is converted into high-definition image, many pixels are arranged in inherently little screen area, and this requirement makes the size of a pixel less.That is, problem is how to reduce the size of a pixel.Since along with the progress of semiconductor microactuator Machining Technology has realized less pixel, can head it off.

In addition, require to save space and save power into electrical equipment, precision equipment and video equipment.About projector, especially portable projector becomes the emphasis of concern.Therefore, the trend of development can reduce in the weight of projector and size.The single panel colour projection instrument of comparing with three plate color projecting apparatus has optical system relatively simple for structure especially, and is therefore suitable for minimizing (Japanese Patent Laid-Open No.2000-137220) in size and weight.

Yet the unit picture element of the image-displaying member in single-board color liquid crystal projector has wherein a plurality of points (dot) and dyed layer and is arranged on the structure in each point.As mentioned above, exist wherein and manufacture and there is the more trend of the pixel of high definition.Yet, can not make such as driving liquid crystal to diminish pro rata with the switching device of light modulated and the such circuit/electronic circuit of auxiliary capacitor and the high definition of pixel.This is because use micromachining technology to manufacture auxiliary capacitor and switching device on such as semiconductor substrate or the such substrate of glass substrate, but due to the restriction to semiconductor technology, the live width that restriction can realize.In addition,, even if micromachined is possible technically, in view of capital investment etc., may be difficult to realize micromachined due to cost relevant issues.As a result, in a point, the increase of the ratio of the area of switching device and its aperture opening ratio reduce.The colourity that the deterioration of the light transmission (transmittance) that in addition, existence causes such as the light absorption in dyed layer, the heat being produced by the light absorption by dyed layer cause worsens, picture quality reduces problem and integrity problem.

Summary of the invention

The display device that the object of this invention is to provide liquid crystal display cells and this liquid crystal display cells of use, it can solve the problem that is wherein implemented as the reduction of high definition pixel time utilization ratio when the pixel of liquid crystal display cells.

Liquid crystal display cells of the present invention comprises first substrate, and this first substrate at least comprises a plurality of pixel electrodes and the switching device being laminated on together; And second substrate, this second substrate strides across liquid crystal layer towards first substrate, at least comprises the public electrode and the dyed layer that are laminated on together.On first substrate, many gate lines are arranged in parallel and by interval equably, and many data lines are arranged in parallel and interval equably in the direction vertical with gate line, and by by gate line and data line around region form a point.In addition, this point comprises the first opening, and this first opening at least has and is arranged on the switching device of the infall between gate line and data line and the first pixel electrode arranging via switching device; With the second opening, this second opening at least has the second pixel electrode and control electrode.In addition, in the first opening the threshold voltage relevant to variation in light transmission be different from the second opening with light transmission in the relevant threshold voltage of variation.

In conjunction with the accompanying drawing that example of the present invention is shown, according to following description, above and other object of the present invention, advantage and feature will become obvious.

Accompanying drawing explanation

Fig. 1 illustrates according to the first exemplary embodiment of liquid crystal display cells of the present invention and is the schematic diagram of top view that point (repetitive) structure of liquid crystal display cells is shown;

Fig. 2 is the schematic diagram that is illustrated in the xsect of the liquid crystal display cells in the A-A ' direction of Fig. 1;

Fig. 3 is the schematic diagram of planimetric map of the some layout of the liquid crystal display cells in the first substrate side being illustrated in Fig. 1;

Fig. 4 is the figure of equivalent electrical circuit that the point of the liquid crystal display cells in Fig. 1 is shown;

Fig. 5 is the schematic diagram of planimetric map of the structure of pixel (repetitive) that the liquid crystal display cells in Fig. 1 is shown;

Fig. 6 is the curve map that the voltage-transmission characteristics of the liquid crystal display cells in Fig. 1 is shown;

Fig. 7 is the figure of another equivalent electrical circuit that the point of the liquid crystal display cells in Fig. 1 is shown;

Fig. 8 is the figure of another equivalent electrical circuit that the point of the liquid crystal display cells in Fig. 1 is shown;

Fig. 9 be illustrate by according to the second exemplary embodiment of liquid crystal display cells of the present invention by a schematic diagram for the top view of the pixel forming;

Figure 10 is the schematic diagram that is illustrated in the xsect of the liquid crystal display cells in the B-B ' direction of Fig. 9;

Figure 11 is the schematic diagram of planimetric map of the some layout of the liquid crystal display cells in the first substrate side illustrating in Figure 10;

Figure 12 is the schematic diagram of the xsect of the liquid crystal display cells in the C-C ' direction being illustrated in Fig. 9;

Figure 13 is the schematic diagram illustrating according to the xsect of the point of the 3rd exemplary embodiment of liquid crystal display cells of the present invention;

Figure 14 is the curve map that the voltage-transmission characteristics of the liquid crystal display cells in Figure 13 is shown;

Figure 15 is the schematic diagram that the planimetric map of the some layout in first substrate side is shown, and this planimetric map illustrates the 4th exemplary embodiment of liquid crystal display cells of the present invention;

Figure 16 is the schematic diagram of the xsect of the liquid crystal display cells in the D-D ' direction illustrating in Figure 15;

Figure 17 is the schematic diagram illustrating according to the xsect of the point of the 5th exemplary embodiment of liquid crystal display cells of the present invention;

Figure 18 is the figure that the equivalent electrical circuit of the liquid crystal display cells in Figure 17 is shown;

Figure 19 is the schematic diagram illustrating according to the xsect of the point of the 6th exemplary embodiment of liquid crystal display cells of the present invention;

Figure 20 is the schematic diagram of the xsect of the liquid crystal display cells in the A-A ' direction being illustrated in Figure 19;

Figure 21 is according to the schematic configuration figure of the point of the 7th exemplary embodiment of liquid crystal display cells of the present invention;

Figure 22 is the schematic diagram of the xsect of the liquid crystal display cells in the A-A ' direction being illustrated in Figure 21; And

Figure 23 is used according to the schematic configuration figure of the projector of the example of the display device of liquid crystal display cells of the present invention.

Embodiment

Hereinafter, will explain exemplary embodiment of the present invention with reference to accompanying drawing.The assembly with identical function is assigned with identical Reference numeral and can the descriptions thereof are omitted.

[exemplary embodiment 1]

The first exemplary embodiment according to liquid crystal display cells of the present invention will be described.

Fig. 1 illustrates according to the first exemplary embodiment of liquid crystal display cells of the present invention and is the schematic diagram that the top view of a structure is shown, and Fig. 2 is the schematic diagram that is illustrated in the xsect in the A-A ' direction of Fig. 1.

In liquid crystal display cells, a pixel is by a plurality of points (common three points; Red, green and blue) form and display panels is to be formed by a plurality of pixels.Will describe and using the situation of a point as example.

As shown in fig. 1, a point 14 is comprised of opening 29 and the black matrix" 61 that is light shield region, this opening 29 is to be comprised of with the second opening 26 that is equipped with painted areas 28 the first opening 25 that is equipped with the region (being called as hereinafter, " high-transmission rate region ") 27 with high light transmission.

In addition, as shown in Figure 2, liquid crystal layer 12 is arranged between first substrate 21 and second substrate 22.In first substrate 21, the first pixel electrode 31, the second pixel electrode 32 and the thin film transistor (TFT) (hereinafter referred to as " TFT ") 39 being comprised of switching device are formed on the surface of liquid crystal layer 12 sides of the first transparency carrier 23.In addition, in second substrate 22, with red, green and blue etc. painted dyed layer 62 and black matrix" 61, in liquid crystal layer 12 sides, be arranged on the second transparency carrier 24, and transparency electrode is used as such as the such public electrode 33 of the ITO with reservation shape composition (tin indium oxide) and disposed thereon.Do not have dyed layer 62 to be arranged in the first opening 25.By doing like this, form the non-staining region as high-transmission rate region 27.Oriented layer based on needs setting is not illustrated.

The first pixel electrode 31, the second pixel electrode 32 and public electrode 33 are arranged on respectively a little in 14.By being electrically connected to the gate electrode 47 of gate line 48 (gate line 48 that is electrically connected to the gate electrode 47 in accompanying drawing shown in Figure 3), operate TFT 39 to select the first pixel electrode 31 (or second pixel electrode 32), voltage is applied to the first pixel electrode 31 (or second pixel electrode 32) thereby and between public electrode 33 to control liquid crystal aligning and to show image.

The high-transmission rate region 27 of this exemplary embodiment there is no need to be the region of non-staining completely as above and only to need to have the light transmission higher than painted areas 28.For example, can high-transmission rate region 27 be set by using dyed layer 62 to cover whole second substrate 22, through hole be partly set in the first opening 25 simultaneously or partly make dyed layer 62 thinner to increase light transmission.Thereby this reduces by the light absorption causing such as pigment and the such coloring components of colorant in high-transmission rate region 27 and allows from the light of backlight incident transmission and the increase light transmission efficiencies of comparing with painted areas 28 effectively.

Fig. 3 is the schematic diagram illustrating according to the planimetric map of the some layout of first substrate 21 sides of the liquid crystal display cells of this exemplary embodiment, and Fig. 4 illustrates according to the equivalent circuit diagram of the point of the liquid crystal display cells of this exemplary embodiment.

As shown in Figure 3, in the first substrate 21 that TFT 39 forms therein, point 14 be by many gate lines 48 by extending in a horizontal direction and many data lines 49 of extension in the vertical direction around region form.This point 14 is equipped with TFT 39, the first pixel electrode 31, the second pixel electrode 32, control electrode 34, public electrode 33, storage capacitor electrode 35 and public capacitance line 50.

As shown in Fig. 2, Fig. 3 and Fig. 4, in the first pixel electrode 31, the source electrode 46 of storage capacitor electrode 35, control electrode 34 and TFT 39 is electrically connected.When the first pixel electrode 31, control electrode 34 and storage capacitor electrode 35 have identical electromotive force, the first memory capacitance Cst1 is formed between control electrode 34 and public capacitance line 50 and between storage capacitor electrode 35 and public capacitance line 50.In addition, the first liquid crystal capacitance Clc1 is formed on via liquid crystal layer 12 that to be disposed in be between the public electrode 33 and the first pixel electrode 31 on the second substrate 22 of subtend substrate.

On the other hand, the second pixel electrode 32 forms coupling capacitance Cc in floating empty (electrically floating) state of electricity and via control electrode 34 and the 3rd protection dielectric film 43.In addition, the second memory capacitance Cst2 is formed between the second pixel electrode 32 and public capacitance line 50.In addition, the second liquid crystal capacitance Clc2 is formed between the second pixel electrode 32 and public electrode 33 via liquid crystal layer 12.

Two openings 25 of point 14 and 26 are comprised of high-transmission rate region 27 and the painted areas 28 with different light transmissions.The first pixel electrode 31 that is electrically connected to TFT 39 is disposed in high-transmission rate region 27.The second pixel electrode 32 and the control electrode 34 that form coupling capacitance Cc are disposed in painted areas 28.

The such parameter of the material of the size of use such as each electrode, thickness and each dielectric film (dielectric parameter) can the second memory capacitance Cst2, the first memory capacitance Cst1 and the size of each self-capacitance of coupling capacitance Cc be set to wanted value.

By the ratio of the additional capacitor Cst2 between the coupling capacitance Cc between control electrode 34 and the second pixel electrode 32, the second pixel electrode 32 and public capacitance line 50 and liquid crystal capacitance Clc2, determine the pixel electrode voltage ratio V1/V2 between the voltage V2 that is applied to the voltage V1 of the first pixel electrode 31 and is applied to the second pixel electrode 32.When the voltage of supposition public capacitance line 50 is the voltage identical with public electrode 33, by expression formula below, can determine pixel electrodes voltage ratio V1/V2 here.

[expression formula 1]

Pixel electrode voltage ratio V1/V2=(Clc2+Cc+Cst2)/Cc

Therefore,, owing to being applied to poor in the voltage of the first pixel electrode 31 and the second pixel electrode 32, different voltage is applied to region 27 separately and 28 liquid crystal molecule.This make voltage-transmission characteristics (V-T characteristic) in region 27 and 28 changes and the variation in the light transmission to the first pixel electrode 31 is relevant threshold voltage vt h1 and and the light transmission of the second pixel electrode 32 in the relevant threshold voltage vt h2 of variation between produce poor.Main because non-existent coupling capacitance Cc is formed in the second opening 26 in the first opening 25, so produce poor in the threshold voltage relevant to variation in light transmission.According to expression formula 1, the voltage V2 that keeps the relation of V1 > V2 and be applied to the second pixel electrode 32 is relatively less than the voltage V1 that is applied to the first pixel electrode 31.Therefore the threshold voltage vt h1 that, the variation in the light transmission to the first pixel electrode 31 is relevant and and the light transmission of the second pixel electrode 32 in the relevant threshold voltage vt h2 of variation between keep following relation.

[expression formula 2]

Vth1＜Vth2

Therefore,, although will describe details after a while, the liquid crystal display cells of this exemplary embodiment can obtain voltage-transmission characteristics (V-T characteristic) as shown in Figure 6.Suppose that voltage and Z-axis that transverse axis illustrates the source electrode 46 of TFT 39 illustrate transmissivity, Vth2 is displaced to the right (high-voltage side) of Vth1.Light transmission is the summation of the transmissivity in high-transmission rate region 27 (corresponding with the first pixel electrode 31) of the first opening 25 and the transmissivity of the painted areas 28 (corresponding with the second pixel electrode 32) of the second opening 26.Therefore, can when low-voltage, increase the light transmission of display panels.In addition, because Vth2 is displaced to the voltage side higher than Vth1, so large middle gray scale voltage can be set.This allows the meticulousr color of performance.In addition, owing to can increasing the brightness of the light that passes painted areas 28 and reducing the brightness of passing the light in high-transmission rate region 27, so can reduce the deterioration of the color depth of the colourless light that comes from high-transmission rate region 27.

First substrate 21 and the second substrate 22 of this exemplary embodiment will be described in further detail.

First first substrate 21 will be described.As shown in Figures 2 and 3, TFT 39 has gate electrode 47 wherein and is disposed in than the top gate structure of source electrode 46 and the high position of drain electrode 45.Amorphous silicon or polysilicon can be used in active layer (semiconductor layer) 40 and use self-aligned technology can form active layer 40.

Use CVD (chemical vapor deposition) method etc. that island semiconductor layer 40 is formed on the first transparency carrier 23 of being made by glass.The first protection dielectric film 41 is formed on semiconductor layer 40, and gate electrode 47 is formed thereon and the second protection dielectric film 42 is further formed thereon.

Source electrode 46 and drain electrode 45 are formed on the second protection dielectric film 42.In addition, source electrode 46 and drain electrode 45, and the source electrode-drain region of semiconductor layer 40 is joined together via the first contact hole 37.The bottom of gate electrode 47 is channel regions of semiconductor layer 40.

The 3rd protection dielectric film 43 is formed on the top on the whole surface of drain electrode 45 and source electrode 46.The 3rd protection dielectric film 43 is equipped with the second contact hole 38.Drain electrode 45 is connected to data line 49, and source electrode 46 is connected to the first pixel electrode 31 via the second contact hole 38.

TFT 39 is equipped with gate electrode 47, drain electrode 45 and source electrode 46, and for be sweep trace gate line 48 be between the data line 49 of video signal cable intersect neighbouring in each point be provided with TFT 39.Gate electrode 47 is electrically connected to gate line 48; Drain electrode 45 is connected to data line 49; And source electrode 46 is connected to the first pixel electrode 31.

Near TFT 39, use the first protection dielectric film 41 to cover semiconductor layer 40 and protect dielectric film 42 protection gate electrodes 47 by second.In addition, silicon nitride etc. can be used in protection dielectric film 41 and 42.

The first pixel electrode 31 and the second pixel electrode 32 are formed and can be used such as the such material of ITO by transparency electrode.In addition, because the first pixel electrode 31 forms in identical layer, so the first pixel electrode 31 and the second pixel electrode 32 can form monolithic with the second pixel electrode 32.

Source electrode 46 and the first pixel electrode that the first pixel electrode 31 is electrically connected to TFT 39 are electrically connected to control electrode 34 via the second contact hole 38.Control electrode 34 can also form monolithic with the source electrode 46 of TFT.

Metal film of chromium etc. can be used in gate line 48, source electrode 46, drain electrode 45 and public capacitance line 50.In addition, public capacitance line 50 can also form monolithic with gate line 48.

This exemplary embodiment adopts and is provided with for electric capacity being added to the structure of the public capacitance line 50 of the second pixel electrode 32.Yet, if use coupling capacitance Cc and the liquid crystal capacitance Clc2 between the second pixel electrode 32 and public electrode 33 between the second pixel electrode 32 and control electrode 34 can obtain the necessary electric potential difference between the voltage V2 that is applied to the voltage V1 of the first pixel electrode 31 and is applied to the second pixel electrode 32, do not need so to arrange public capacitance line 50.

In addition,, according to this exemplary embodiment, when gate line 48 is selected, signal voltage is write control electrode 34 and the first pixel electrode 31 that is connected to source electrode 46 from data line 49 via TFT 39.Under these circumstances, the capacitance ratio based on coupling capacitance Cc, memory capacitance Cst2 and liquid crystal capacitance Clc2 is defined as the predetermined potential between control electrode 34 and public capacitance line 50 by the electromotive force of the second pixel electrode 32 under floating empty condition.Public capacitance line 50 can be constructed to make it have the electromotive force identical with public electrode 33 on second substrate 22 for example or can be connected to aforesaid gate line 48 etc.

Between the first pixel electrode 31 (or second pixel electrode 32) and control electrode 34 the 3rd protection dielectric film 43 can be that organic material is basic protection dielectric film or the film preferably with the effect of flat surfaces.The structure that in addition, can have the nitride film that is laminated on together and an organic film by employing improves reliability, insulation attribute and smooth.

In addition, being formed on the 3rd between storage capacitance line 50 and the second pixel electrode 32 protection dielectric film 43 can be to be made by the material that is different from the protection dielectric film 42 in the layer of the top that is formed on gate line 48 and data line 49.Be formed on the protection of the 3rd between storage capacitance line 50 and the second pixel electrode 32 dielectric film 43 preferably by the transparent material of visible light is made, there is large specific inductive capacity, allow film configuration and there is smooth attribute.Be disposed in protection dielectric film 42 in the layer of top of gate line 48 and data line 49 preferably by the transparent material of visible light is made, there is low-k, allow film configuration and there is smooth attribute.This increase is formed on the capacitive coupling Cc in the second pixel electrode 32 and can reduces the stray capacitance of data line 49 and gate line 48 simultaneously.

Next, will use Fig. 2 to describe second substrate 22.

As shown in Figure 2, second substrate 22 is chromatic filters, has black matrix" 61, is formed on the lip-deep redness, green of liquid crystal layer 12 sides of the second transparency carrier 24 of being made by glass or blue etc. dyed layer 62.In second substrate 22, liquid crystal layer 12 sides of using printing process etc. that red, green or blue dyed layer 62 and black matrix" 61 are formed on to the second transparency carrier 24.By sputtering ITO film, be formed thereon, then use photoetching technique that ITO film is patterned into wanted shape and public electrode 33 is formed.

As described in detail in exemplary embodiment 7 and 8, for high-transmission rate region 27, through hole (referring to Fig. 2, Figure 19, Figure 20, Figure 21 and Figure 22) can be arranged in first opening 25 of dyed layer 62 of second substrate 22.Transparent resin can be arranged and be used as this through hole.The thickness that in addition, can also partly reduce dyed layer 62 is to improve light transmission efficiencies.In the technology of thickness that partly reduces dyed layer 62, can also in the situation that not increasing operation steps, reduce the poor of level (level) between high-transmission rate region 27 and painted areas 28, thereby and improve display quality.

Black matrix" 61 can also be arranged on the boundary between high-transmission rate region 27 and painted areas 28.Under these circumstances, can shield light and the minimizing deterioration of image quality by the metal line reflection of coupling capacitance portion.In the out-of-alignment situation preferably producing, the black matrix" 61 with relatively large width is set when considering together with first substrate 21 is superimposed with second substrate 22.

Overlayer 63 can be arranged on liquid crystal layer 12 sides of the dyed layer 62 of second substrate 22.Overlayer 63 can flat painted area 28 dyed layer 62 and the level between high-transmission rate region 27 poor, and improve display quality.In addition, column spacer can be formed on liquid crystal layer 12 sides of second substrate 22.Forming cylindricality sept allows pinpoint accuracy ground to adjust the gap between first substrate 21 and second substrate 22.

In addition,, as long as flat shape meets the equivalent electrical circuit in Fig. 4, the flat shape of each assembly is not limited to the shape in Fig. 2.

Hereinafter, manufacture method will be described.

First substrate 21 and second substrate 22 after processing are as mentioned above coated with rubbing agent (not shown) and rub.Next, containment member (not shown) is applied to first substrate 21 and spherical spacer (not shown) is dispersed on second substrate 22 linearly.Then substrate 21 and 22 is pasted together and makes containment member hardening by heating.When column spacer is formed on second substrate 22, substrate 21 does not have dispersing ball sept together with 22 can be secured at simultaneously.Next, the first substrate being joined together by containment member 21 and second substrate 22 are cut into display panels shape.After cutting, by injection orifice, inject nematic crystal and then use ray hardening resin sealing injection hole.

Next, the both sides that Polarizer (not shown) is secured at display panels make their axis of homology mutually orthogonal, peripheral drive circuit (not shown) be attached to this and by modularization to complete liquid crystal display cells.Polarizer can be integrated be useful on angle compensation field phase retardation film Polarizer or there is the directivity that can strengthen backlight illumination and the Polarizer that can improve the film of forward direction brightness.In this exemplary embodiment, TN (twisted-nematic) scheme is applied to driving liquid crystal and normal white state to be set up.

Hereinafter, will further use example below to describe the feature of this exemplary embodiment.

Fig. 5 be illustrate according to the liquid crystal display cells of this exemplary embodiment by a schematic diagram for the top view of the pixel forming.In unit picture element 13, a pixel (repetitive) is comprised of red point 92, green point 93 and Bluepoint 94 (3 * 1) point.Red, green and blue three-color is applied to the dyed layer 62 of three points 93,93 and 94.Opening 29 is by comprising as the second opening 26 of each painted areas 64,65 of painted areas 28 and 66 and comprising that first opening 25 in high-transmission rate region 27 forms.According to this example, for 13, one points 14 of unit picture element with 111 μ m width and 111 μ m height, be by forming by unit picture element 13 being divided into the rectangle with 37 μ m width and 111 μ m height that equal part obtains.Each colored point 14 is periodically arranged in the direction vertical with the long side of putting 14 according to the order of red point 92 → green point 93 → Bluepoint 94.

For convenience's sake, XY orthogonal coordinate system is set up as follows.In the direction being arranged therein, suppose that the direction of red point 92 → green point 93 → Bluepoint 94 is+directions X and contrary direction be-directions X.+ directions X and-directions X is commonly referred to as " X-direction ".On the other hand, the length direction of supposing each point data line of 14 is called as " Y direction ".

In the liquid crystal display cells of this example, the size of unit picture element be 111 μ m as above wide * the high and liquid crystal display cells of 111 μ m forms the VGA (Video Graphics Array) of the display pixel with wide by 480 * high 600.The painted areas 28 being combined and the aperture opening ratio in high-transmission rate region 27 are 55.9%.The painted areas 28 of each point 14 is 7: 3 with the Area Ratio in high-transmission rate region 27.Therefore, the aperture opening ratio of painted areas 28 be 39.13% and the aperture opening ratio in high-transmission rate region 27 be 16.77%.

In addition, the capacitance of supposing liquid crystal capacitance Clc2 is 50 μ F, and the capacitance of memory capacitance Cst2 is 100 μ F, and the capacitance of coupling capacitance Cc is 150 μ F, and the capacitance of liquid crystal capacitance Clc1 is 15 μ F, and the capacitance of memory capacitance Cst1 is 75 μ F.Therefore, according to expression formula 1, (pixel electrode voltage ratio V1/V2)=1/2.Therefore, 1/2 of the voltage of the electromotive force of the first pixel electrode 31 be applied to the second pixel electrode 32.

In the liquid crystal display cells of the present embodiment, when adjusting GTG (γ adjustment), white displays (255/255 GTG) is set to 1V and middle GTG is set to 2 to 5V.

According to above-mentioned structure, the physical property values based on each material is used simulator to calculate light transmission.Result, light transmission in liquid crystal layer 12 is 81%, and the light transmission in parallel Polarizer is 40%, and the light transmission in dyed layer 62 is 38%, painted areas 64,65 and 66 light transmission are 4.86%, and the light transmission in high-transmission rate region 27 is 5.48%.Under these circumstances, the light transmission of the liquid crystal display area of this example is 10.3%, and it is the total value of these optical transmission rates.Use the material of this example, the same with the situation of prior art that high-transmission rate region 27 is not wherein set in opening, in second substrate 22 sample calculation by only painted areas 28 forms in the situation that.As a result, the light transmission of the display panels under white show state is 6.49%.According to the light transmission of the display panels under the white show state of this example, be 10.3%, this means, compare with the situation of prior art in the situation that not thering is any high-transmission rate region 27, the light transmission of display panels can be improved to 1.48 times.This has increased forward direction brightness and contrast, allows to provide the display panels with outstanding visuality.In addition, owing to can increasing the light transmission of display panels, so can reduce power consumption backlight and power is kept in module.

In addition, Fig. 6 illustrates the curve map of the voltage-transmission characteristics of the liquid crystal display cells that uses simulator calculating.As shown in Figure 6, suppose that transverse axis (X-axis) illustrates the voltage of control electrode 34 and the light transmission that Z-axis (Y-axis) illustrates each region 27,28, because the first opening 25 and the second opening 26 have the different voltages that are applied to liquid crystal molecule, so the relevant threshold voltage of the variation from light transmission of voltage-transmission characteristics (V-T characteristic) is different.Especially in this example, as shown in expression formula 2, the threshold voltage vt h1 relevant to the light transmission characteristic of the first opening 25 is less than the threshold voltage vt h2 relevant with the light transmission characteristic of the second opening 26 relatively, and therefore can observe, with respect to the V-T family curve of the first opening 25, the V-T family curve of the second opening 26 is along the displacement of+X-direction (high-pressure side).The light transmission of display panels is the summation of light transmission that comprises first opening 25 in high-transmission rate region 27 and comprise the second opening 26 of painted areas 28.Therefore, can increase light transmission and provide high brightness being less than under the voltage of Vth1.At middle gray scale voltage, at the light transmission of the first opening 25, become less.Yet, owing to comparing with Vth1, towards high potential side displacement Vth2, so can keep the light transmission in the second opening 26.Therefore, can increase the brightness of the light that passes painted areas 28 and reduce the brightness of passing the light in high-transmission rate region 27.Therefore, can reduce the minimizing in the color depth of the non-colored light that comes from high-transmission rate region 27.In addition, because middle gray scale voltage can be set to wide region, so can also express little aberration.When the voltage higher than middle gray scale voltage is applied in, light does not have from the second opening 26 transmissions, and therefore can cause the saturation degree towards low-light level,, shows black that is.

When the V-T characteristic of the first opening 25 is identical with the V-T characteristic of the second opening 26, can be set to be equivalent at low-voltage light transmission the level of this example.Yet because Vth1 has the value identical with Vth2, so the scope of voltage of gray scale voltage is little in the middle of can being set to, and just after increase voltage, low-light level is set up, and, causes black demonstration that is.In addition,, when middle GTG is shown, non-colored light composition that can not be separated and many through the light component in the high-transmission rate region 27 of the first opening 25 is mixed together.This causes the variation in color depth, colourity deterioration and deterioration of image quality.On the other hand, according to this example, can reduce the impact of the light in the high-transmission rate region 27 of passing the first opening 25 under middle gray scale levels, and therefore can provide the high-quality liquid crystal display cells not reducing in middle gray scale levels picture quality.

In this example, red point 92, green point 93 and Bluepoint 94 are by be sequentially arranged according to this+directions X.Yet order is not limited to this.Yet as long as pixel 13 is comprised of the point 92,93 and 94 of red, green and blue three-color and these points are periodically arranged, any order is all acceptable.Pixel 13 can also be comprised of the point 14 with four kinds or more colors.Under these circumstances, can improve the performance of more colors and GTG.

In addition, the area in point 92,93 separately and 94 high-transmission rate region 27 is identical, but the area of putting 92,93 and 94 high-transmission rate region 27 can be different.Preference relation can be (green point 93) > (red point 92) > (Bluepoint 94).In addition, high-transmission rate region 27 can be arranged at least one of point of unit picture element 13 and high-transmission rate region 27 can not be arranged in red point 92 and Bluepoint 94, and high-transmission rate region 27 only can be arranged in green point 93.

As mentioned above, the demonstration that the liquid crystal display cells that has a high definition pixel can reduce in middle gray scale levels worsens and improves significantly light transmission simultaneously.This makes to provide the liquid crystal display with high surface brightness and outstanding visuality.

According to the liquid crystal display cells of above-mentioned exemplary embodiment and example, further there is following feature.

(coupling capacitance ratio)={ (coupling capacitance Cc)/(liquid crystal capacitance Clc2)+(memory capacitance Cst2) } preferably 1 or larger.In addition, coupling capacitance ratio is larger, and the difference in the magnitude of voltage while there is saturated (saturation voltage) in the V-T characteristic of region 27 separately and 28 is larger, and the therefore intermediate luminance in separated the first opening 25 and the second opening 26 more easily.For middle gray scale voltage, according to the number of gray scale levels, by the setting voltage Vw from white demonstration, to the voltage distribution of the setting voltage Vb in black demonstration, give each gray scale levels.Therefore,, for the voltage Vm corresponding with intermediate luminance, keep the relation of Vw < Vm < Vb.Therefore, the voltage corresponding with intermediate luminance in the example of the liquid crystal display cells shown in Fig. 6 can be at random arranged between about 2.0V and 5.0V.This makes it possible to further reduce the impact of passing the light component in high-transmission rate region 27 in the demonstration with middle GTG.In this example, (coupling capacitance ratio)=4.

As shown in Figure 5, when black matrix" 61 is set with cover data line 49, gate line 48 and TFT 39, the special strong place of light intensity in display panels outside can shield from the light of the outside incident of display panels, and can improve bright local contrast and the liquid crystal display cells with outstanding visuality is provided.In addition, black matrix" 61 can also be set to cover the borderline region (not shown) between public capacitance line 50 and the first pixel electrode 31 and the second pixel electrode 32.This allows to cover the disclination (disclination) generating in the borderline region of pixel electrode, thereby and reduces the leakage of light and improve contrast.

The thickness that reduces by the 3rd protection dielectric film 43 allows to increase the electric capacity of per unit area, thereby and can reduce the area of coupling capacitance portion and widen opening.

In layer below control electrode 34, public capacitance line 50 is set makes it possible to obtain large memory capacitance, thus arrange openings 29 and improve the light transmission of display panels widely.

In addition, can form data line 49, drain electrode 45 and control electrode 34 simultaneously, and further form the first pixel electrode 31 and the second pixel electrode 32 simultaneously, thereby and save technique and realize cost reduction.

The pattern that each dyed layer 62 is wherein arranged on second substrate 22 sides has been described, even but use COT (TFT enamel light filter) technology that dyed layer 62 is arranged on first substrate 21, that effect also keeps is identical.

Describe up to now the example of normal white mode, but be equally also applied to normal black pattern.When being applied to normal black pattern, the first opening 25 can be designated as painted areas 28 and the second opening 26 can be designated as high-transmission rate region 27.

In addition, it is desirable to, application has the liquid crystal material of the little threshold voltage that the variation to light transmission of V-T characteristic is relevant.The liquid crystal material that application has the little threshold voltage that the variation to light transmission of V-T characteristic is relevant makes it possible to the large difference of the saturation voltage value between the first opening 25 and the second opening 26 is set more easily and can realizes low voltage drive and low power consumption.

In addition the region that, wherein coupling capacitance Cc is formed is preferably arranged in the second opening 26.Because the second opening 26 comprises dyed layer 62, so compare with high-transmission rate region 27, the second opening 26 absorbs more light.This can reduce the outside reflection of light producing on the metal surface in capacitive coupling region significantly.

In addition for high definition pixel, by rimiform through hole is as shown in Figure 1 arranged on to the non-staining region forming in dyed layer 62, as high-transmission rate region 27, be effective.When forming rimiform through hole, when observing display panels from top, through hole has along the band pattern of the direction that wherein gate line extends with along the wide band pattern of the direction that wherein data line 49 extends.Because this through hole is simple patterns of openings, so can improve technique degree of accuracy and reduce the variation in via area.

Due to high-transmission rate region 27 allow light easily by and there is large radiating effect, so can reduce the temperature of LCD intralamellar part.Thereby this reduces the deterioration of the dyed layer 62 being caused by the light of launching from back light and can improve reliability.

Although the TFT of this exemplary embodiment 39 is described to have top gate structure, TFT39 can also have the bottom grating structure that grid is disposed in the below of source electrode and drain electrode.Top gate structure has the advantages that wherein unlikely occur wiring breakage etc.Therefore bottom grating structure allows to pile up continuously multilayer, and has the film cleanliness of height and have the feature of the manufacture stability that provides outstanding.TFT 39 can be fin (fin) type.Semiconductor layer can also be amorphous silicon, polysilicon, oxide semiconductor or organic semiconductor.When polysilicon is used, there is following advantage, except display part, can also will be built on identical substrate such as the such peripheral circuit of gate drivers, source electrode driver, signal processing circuit and power circuit.In addition, can select a N-shaped or p-type as the type of TFT 39.Yet, due to the large magnitude or more in mobility ratio hole of electronics, so N-shaped is preferred.

Next, will describe according to the modified example of the circuit structure of this exemplary embodiment.Fig. 7 illustrates another equivalent circuit diagram of the equivalent electrical circuit shown in Fig. 4.Being different from significantly the circuit structure shown in Fig. 4 is, the second pixel electrode is formed and makes not in completely floating dummy status.That is, the situation of equivalent electrical circuit as shown in Figure 4, the liquid crystal display cells of this exemplary embodiment does not adopt floating empty structure, and in equivalent electrical circuit, electric charge can be stored in the second pixel electrode 32 for some reason.As shown in Figure 7, the first repeating resistance device R1 that there is substantially limited resistance value by and coupling capacitance Cc be connected in parallel between the second pixel electrode 32 and control electrode 34.For example, can form alternative the 3rd protection dielectric film 43 of semiconductor film of amorphous silicon etc.By using suitable foreign ion this semiconductor film that adulterates can obtain the resistance value of expectation.

In addition, as have with Fig. 7 in of the similar effect of the structure of equivalent electrical circuit, the second repeating resistance device R2 with limited resistance value can link together in parallel with memory capacitance Cst2, substitutes butt coupling resistor R1 and coupling capacitance Cc in parallel.Under these circumstances, the semiconductor film of amorphous silicon or p-Si etc. may be formed on alternative the 3rd protection dielectric film 43 between public capacitance line 50 and the second pixel electrode 32, and experiences doping as above.For prevent from being presented at be stored in the electric charge in the second pixel electrode 32 impact by calcination or prevent that surpassing the residual image of the response time of liquid crystal when moving image is shown occurs, the repeating resistance device R linking together in parallel with coupling capacitance Cc or memory capacitance Cst2 is set to following value, that is, stored electric charge is not discharged.According to the pattern of the use of liquid crystal display cells, can arrange, make complete electric discharge or make the several seconds complete electric discharge after the time-out of several minutes in the shown period at frame.Remaining structure is identical with aforesaid structure.

Fig. 8 illustrates another equivalent circuit diagram.

As shown in Figure 8, form the 2nd TFT 15 and make to connect the second pixel electrode 32 and public capacitance line 50, and the grid of the 2nd TFT 15 is connected to aforesaid gate line 48.Adopt this kind of structure to make when aforesaid gate line 48 1 selected, the electromotive force of public capacitance line 50 is just written into the second pixel electrode 32, and the electric charge being stored in pixel electrode 32 can be discharged.

Equivalent electrical circuit shown in Fig. 7 and Fig. 8 also can be applicable to the exemplary embodiment that will describe after a while.

[exemplary embodiment 2]

The second exemplary embodiment according to liquid crystal display cells of the present invention will be described.

Fig. 9 be illustrate according to the second exemplary embodiment of liquid crystal display cells of the present invention by a schematic diagram for the top view of the pixel forming.Figure 10 is the schematic diagram of the xsect in the B-B ' direction being illustrated in Fig. 9.Figure 11 is the schematic diagram of planimetric map that is illustrated in the some layout of the first substrate side in Figure 10.Figure 12 is the schematic diagram of the xsect in the C-C ' direction being illustrated in Fig. 9.Will omit the description of the assembly identical with exemplary embodiment 1.

As shown in Figure 9, unit picture element 13 is to be formed by three points: red point 92, Bluepoint 94 and green point 93.In this exemplary embodiment, only, in green point 93, opening 29 is comprised of the second opening 26 and the first switch 25.The opening 29 of green point 94 and red point 92 is only comprised of an opening.

The second opening 26 of green point 93 is equipped with green coloring region 65, and the first opening 25 is equipped with film green coloring region 67.The opening 29 that the opening 29 of red point 92 is equipped with red colored region 64 and Bluepoint 94 is equipped with blue-colored region 66.In addition, black matrix" 61 is arranged in the wiring except opening.

As shown in Figures 10 and 11, the source electrode 46 by the first pixel electrode 31 of making such as the such transparent material of ITO and TFT 39 is joined together via the second contact hole 38.The part of the second pixel electrode 32 via be by silicon nitride film etc., made the 4th protection dielectric film 44 be formed on the first pixel electrode 31 tops layer in.That is, coupling capacitance Cc is formed in the first pixel electrode 31 and the overlapped region of the second pixel electrode 32 via the 4th protection dielectric film 44.

In addition, second substrate 22 is chromatic filters, and black matrix" 61, dyed layer 62, overlayer 63 and public electrode 33 are formed on liquid crystal layer 12 sides of the second transparency carrier 24.The second opening 26 that comprises the second pixel electrode 32 is equipped with thick film dyed layer 62.The high-transmission rate region 27 of the first opening 25 is not non-staining region completely.With the following part of the first transparency carrier 23 accordingly,, this part on the first pixel electrode 31 and is not covered by the second pixel electrode 32, and the dyed layer (thin dyed layer) 68 with less thickness and lower colour purity of comparing with the dyed layer 62 of the second opening 26 is arranged on the second transparency carrier 24.The light transmission of the dyed layer 62 in being arranged on the second opening 26 is when being arranged on thin dyed layer 68 in the high-transmission rate region 27 of the first opening 25 and comparing, and the light transmission that is arranged on the dyed layer 62 in the second opening 26 is less.

In the example of this exemplary embodiment, the thin dyed layer 68 in high-transmission rate region 27 and the color of dyed layer 62 are green.

In addition, black matrix" 61 is formed on the border between the first opening 25 and the second opening 26.This black matrix" 61 is arranged in the thin dyed layer 68 in high-transmission rate region 27 and the part of the scalariform between dyed layer 62, and be arranged on the second pixel electrode 32 and the first pixel electrode 31 of first substrate 21 sides between relative position, boundary line.

Wherein to be different from significantly the feature of the structure of aforesaid the first exemplary embodiment be together with the first pixel electrode 31 is bound up on control electrode 34 to the structure of liquid crystal display cells, and the first pixel electrode 31 and the second pixel electrode 32 are formed in different layers.

Therefore, pixel electrode be by be electrically connected to TFT 39 source electrode 46 the first pixel electrode 31 and at the second pixel electrode 32 that forms electric capacity between itself and the first pixel electrode 31, form.

In addition,, owing to adopting structure that the first opening 25 and the second opening 26 are only arranged in green point 93, as seen from Figure 12, red point 92 and Bluepoint 94 do not have any high-transmission rate region 27.

In addition, as shown in Figure 9, when black matrix" 61 is arranged in the borderline region between the first opening 25 and the second opening 26, can cover the disclination occurring on the border between the first pixel electrode 31 and the second pixel electrode 32, thereby and reduce the leakage of light and effectively improve contrast.

The structure that green point 93 is only equipped with the second opening and the first opening has been described in this exemplary embodiment, as shown in Figure 9.Yet red point 92 and Bluepoint 94 also may have the structure identical with aforementioned green point 93.

[exemplary embodiment 3]

The 3rd exemplary embodiment according to liquid crystal display cells of the present invention will be described.

Figure 13 is the schematic diagram illustrating according to the xsect of the point of the 3rd exemplary embodiment of liquid crystal display cells of the present invention.Figure 14 is the curve map illustrating according to the voltage-transmission characteristics of the 3rd exemplary embodiment of liquid crystal display cells of the present invention.Will omit the description of the assembly with the function identical with assembly in aforesaid exemplary embodiment.

The liquid crystal display cells of this exemplary embodiment is the display panels based on horizontal component of electric field drive scheme.Public electrode 33 and the first pixel electrode 31 are that the broach of comb teeth-shaped and each electrode is parallel to gate line (not shown) and extends.In addition, the broach of the first pixel electrode 31 and public electrode 33 is alternately arranged and is mutually kept at a distance.

The region being clipped in the middle by public electrode 33 and the first pixel electrode 31 will be called as " column ", and the summation that a pair of public electrode 33 and the first pixel electrode 31 will be called as the width of width between " electrode pair " and electrode and electrode will be called as " electrode pitch " hereinafter.

Pixel electrode 31 in the first opening 25 and the electrode separation 81 between public electrode 33 are constructed to be greater than the first pixel electrode 31 in the second opening 26 and the electrode separation 82 between public electrode 33.That is, the first opening 25 and the second opening 26 are constructed to have different pixel pitch.

Public electrode 33 and the first pixel electrode 31 are to be made by ITO.In subtend substrate (second substrate) 22, the second transparency carrier 24 is equipped with dyed layer 62 to be used as chromatic filter.Even if use COT technology that dyed layer 62 is arranged in first substrate 23, it is identical that effect of the present invention keeps.

In addition,, when using some reversion to drive into line operate, the voltage of public electrode 33 is constant substantially, and does not therefore drive the liquid crystal on public electrode 33.Therefore, when adopting normal black case, public electrode 33 is also used as light shielding layer, and therefore can reduce the area in the region of black matrix" 61.Yet, when public electrode 33 is while being made of metal, from the strong reflection of light of outside incident, can not be left in the basket, and therefore the reflection coefficient of public wiring is low is important.

In the first opening 25 and the second opening 26, by horizontal component of electric field, drive liquid crystal molecule.In the pixel that data-signal that select and that wherein provide via data line 49 (referring to Fig. 3 and Fig. 9) is written in the sweep signal by providing via gate line 48 (referring to Fig. 3 and Fig. 9), the liquid crystal display cells of this exemplary embodiment produces the electric field parallel with the first transparency carrier 23 between public electrode 33 and the first pixel electrode 31.Then make the direction of orientation of liquid crystal molecule according to electric field, rotate to carry out predetermined demonstration in the plane parallel with the first transparency carrier 23.

Public electrode 33 and the first pixel electrode 31 are formed on the 3rd protection dielectric film 43.Therefore, by public electrode 33 and the first pixel electrode 31 are formed on to identical layer above, can in same steps, use identical material to form public electrode 33 and the first pixel electrode 31, thereby and improve and manufacture efficiency.

Remaining structure is identical with aforesaid the first exemplary embodiment or the second exemplary embodiment substantially.

The operation of this exemplary embodiment will be described.According to horizontal component of electric field drive scheme, the expression formula by below can represent the driven threshold voltage of liquid crystal molecule.

[expression formula 3]

$\mathrm{Vc}=(\mathrm{\&pi;}\&CenterDot;L/d)\&CenterDot;\sqrt{{\mathrm{<figure-callout\; id="22"\; label="K"\; filenames="HSA00000040008100012.png,HSA00000040008100052.png"\; state="\{\{state\}\}">K</figure-callout>}}_{22}/{\mathrm{\&epsiv;}}_0\&CenterDot;\mathrm{\&Delta;\&epsiv;}}$

Wherein L is electrode separation, and d is cel-gap, K ₂₂elastic constant (distortion), ε ₀that specific inductive capacity and Δ ε in vacuum is dielectric constant anisotropy.

From expression formula 3, obviously learn, threshold voltage Vc and electrode separation are proportional.Therefore, because the electrode separation 81 of the first opening 25 is greater than the electrode separation 82 of the second opening 26, so the threshold voltage vt h1 relevant to the light transmission characteristic of the first opening is relatively greater than the threshold voltage vt h2 relevant with the light transmission characteristic of the second opening.

In the example of the liquid crystal display cells of this exemplary embodiment, the aperture opening ratio of the first opening 25 is that the aperture opening ratio of 28%, the second opening 26 is 12%, the light transmission of dyed layer 62 be 40% and the light transmission of parallel Polarizer be 44%.

Figure 14 is the curve map illustrating according to the voltage-transmission characteristics of the liquid crystal display cells of this exemplary embodiment.According in the liquid crystal display cells of this exemplary embodiment, when adjusting GTG (γ adjustments), whitely show that (255/255 GTG) is set to be the 4.5V of peak value of light transmission of display panels and middle GTG and is set to 0.5 and arrives 4V.During white demonstration, this allows to effectively use through the light in high-transmission rate region 27 and the forward direction brightness that improves display panels.In addition, when middle GTG is shown, because the light of small amount is through high-transmission rate region 27, so can effectively use the light through dyed layer 62.Therefore, can realize demonstration, color depth variation or colourity deterioration be reduced to minimum simultaneously.

First, the light transmission in white show state will be described.When calculating is wherein only used painted areas 28 structure chromatic filters and be there is no the example in high-transmission rate region 27 simultaneously, the light transmission of the display panels in white show state is 5.6%.On the other hand, in this exemplary embodiment, the light transmission of the display panels in white show state be 7.8% and the light transmission of display panels can be enhanced as 1.39 times in the situation that only using painted areas 28.That is,, because high-transmission rate region 27 allows light effectively through display panels, can improve significantly the light transmission of the display panels in white show state.This allows forward direction brightness and contrast to increase, and therefore can provide and have outstanding visual display panels.In addition, owing to can increasing the light transmission of optical liquid crystal display panel, so can reduce the power consumption of power consumption backlight and minimizing module.

In this exemplary embodiment, as mentioned above, because the relevant threshold voltage vt h1 of the light transmission characteristic to the first opening 25 is relatively greater than the threshold voltage vt h2 relevant with the light transmission characteristic of the second opening 26, so observe the V-T family curve with respect to the second opening 26, the V-T family curve of first opening 25 that has been shifted in+X-direction (high-pressure side).The light transmission of display panels is the summation of light transmission that has first opening 25 in high-transmission rate region 27 and have the second opening 26 of painted areas 28.Therefore, can increase the large voltage of threshold voltage vt h1 that light transmission and the variation in the light transmission than to the first opening 25 are relevant high brightness is provided.At middle gray scale voltage, the light transmission of the first opening 25 is less.Yet, because the relevant threshold voltage vt h2 of the variation in the light transmission to the second opening 26 has become the threshold voltage vt h1 low voltage more relevant than the variation in the light transmission with the first opening, in the second opening 26, can keep light transmission.Therefore, can increase the brightness of the light that passes painted areas 28 and reduce the brightness of passing the light in high-transmission rate region 27, and therefore reducing the deterioration of the color depth of the non-colored light that comes from high-transmission rate region 27.In addition, because middle gray scale voltage can be set to wider scope, so can represent even small aberration.If the voltage lower than middle gray scale voltage is applied in, the light that comes from so the second opening 26 is no longer through painted areas 28, and therefore can cause and saturated towards low-light level, show black.

Next, the picture quality that middle GTG shows will be described.As prior art, when the first opening 25 and the second opening 26 have identical V-T characteristic, when showing middle GTG, can not separation pass the composition of the light in light transmission region 27, and therefore the composition of many non-colored light is mixed together, cause the variation in color depth, colourity deterioration and deterioration of image quality.On the other hand, according to this example, this exemplary embodiment can reduce by middle GTG has passed the impact of the light in high-transmission rate region 27, and therefore can in the situation that not reducing picture quality, provide in middle gray scale levels high-quality liquid crystal display cells.

In addition, the liquid crystal display cells of this exemplary embodiment is often black, and because the quality of black demonstration is equivalent to the quality of traditional display panels, so can improve contrast by improving the light transmission of display panels.

Therefore, the liquid crystal display cells of this exemplary embodiment can increase significantly the light transmission of white show state simultaneously and reduce demonstration deterioration simultaneously in middle gray scale levels.This exemplary embodiment can provide has gratifying surface brightness and outstanding visual liquid crystal display cells.

The number of electrode pitch and row (number of comb-like electrode) is not limited to this exemplary embodiment, but can be set to suitable value according to pixel size.In addition, electrode material can also be to be made of metal and preferably can be under high definition patterned a kind of, and in particular, is can be under pinpoint accuracy patterned a kind of.Under pinpoint accuracy, composition electrode material can prevent the short circuit between the electrode in identical layer and improve output.

Compare with the end of data line 49, the end of public electrode 33 is arranged to more close the first pixel electrode 31, and pass through cover data line 49 fully, when seeing from second substrate 22 sides, thereby the electric field producing from data line 49 is shielded with the first pixel electrode 31.This prevents vertical crosstalk, by vertical crosstalk, by the demonstration voltage disturbance demonstration voltage of other pixel.

Public electrode 33 can be formed or can be had lower resistance by deposit layer in the part of ITO by low resistive metal.Make public electrode 33 there is low resistance and can reduce delay and the minimizing signal noise in common potential, thereby and can suppress horizontal crosstalk.Resistance value is preferably set to suitable value according to screen size.

Be accompanied by the inhibition of horizontal crosstalk and vertical crosstalk, no longer need to arrange the demonstration fault of black matrix" 61 to prevent from being caused by the electric field from data line 49 and gate line 48 leakages.Therefore, only need to form black matrix" 61 to improve contrast, and can reduce or delete the width of black matrix" 61.Along with deletion or the minimizing of the width of black matrix" 61, can increase the aperture opening ratio of liquid crystal display cells.In addition can increase with respect to when out-of-alignment enough and to spare when overlapped of first substrate 21 and second substrate 22 and therefore improve output.

In addition, public electrode 33 can be electrically connected to public capacitance line 50 via contact hole.Public electrode 33 is connected to the delay that public capacitance line 50 can reduce resistance and common potential (COM electromotive force).This can provide the liquid crystal display cells with the flicker that is reduced or noise and outstanding display quality.

[exemplary embodiment 4]

The 4th exemplary embodiment according to liquid crystal display cells of the present invention will be described.

Figure 15 is the schematic diagram of planimetric map that the some layout of first substrate 23 sides is shown, and this planimetric map illustrates the 4th exemplary embodiment of liquid crystal display cells of the present invention.Figure 16 is the schematic diagram of the xsect in the D-D ' direction being illustrated in Figure 15.Figure 16 not only illustrates first substrate 23 but also subtend substrate (second substrate) 24 is shown.The 4th exemplary embodiment of the present invention is to be applied to the liquid crystal display cells that fringing field switches (FFS) scheme.In addition will omit, the description of the assembly identical with the assembly of aforesaid exemplary embodiment.

As shown in Figure 16, the first pixel electrode 31 and public electrode 33 are arranged in the first opening 25 and the second opening 26 via the 4th protection dielectric film 44.In the first opening 25, pixel electrode 31 and public electrode 33 are not faced mutually via protection dielectric film, and pixel electrode 31 is inserted between adjacent public electrode 33.In addition,, in the second opening 26, laying out pixel electrode 31 makes to cover the whole surface of the second opening 26 and via the 4th protection dielectric film 44 public electrode 33 that connects up above the first pixel electrode 31.

As shown in Figure 15 and Figure 16, the first pixel electrode 31 is electrically connected to the source electrode 46 of TFT 39 and protects public electrode 33 on dielectric film 44 to be electrically connected to adjacent point the 4th, forms the network of lattice-shaped.

Remaining structure is identical with aforementioned the 3rd exemplary embodiment substantially.

Because electrode separation is large in the first opening 25, so it is large to be applied to the electric field of liquid crystal layer 12 threshold voltage little and driving liquid crystal.On the other hand, owing to only applying electric field via the 4th protection dielectric film 44 in the second opening 26, so that electric field can be applied to the threshold value of liquid crystal and liquid crystal drive voltage is effectively little.

Therefore, in normal black case, according to the liquid crystal display cells of this exemplary embodiment, in the mode identical with the 3rd exemplary embodiment, under white show state, can improve significantly light transmission, the demonstration simultaneously reducing in middle gray scale levels worsens.Therefore, this exemplary embodiment can provide and have high surface brightness and outstanding visual liquid crystal display cells.

[exemplary embodiment 5]

The 5th exemplary embodiment according to liquid crystal display cells of the present invention will be described.

Figure 17 is the schematic diagram illustrating according to the xsect of the point of the 5th exemplary embodiment of liquid crystal display cells of the present invention.Figure 18 is the figure illustrating according to the equivalent electrical circuit of the liquid crystal display cells of the 5th exemplary embodiment of the present invention.Will omit the description of the assembly identical with the assembly of aforesaid exemplary embodiment.

This exemplary embodiment is TN type liquid crystal display cells.As shown in Figure 17, the overlayer 63 that second substrate 22 is equipped with black matrix" laminated together 61, public electrode 33, dyed layer 62 and has smooth effect.Compare with public electrode 33, dyed layer 62 is arranged to more close liquid crystal layer 12.In addition, high-transmission rate region 27 is arranged in the first opening 25 and painted areas 28 is arranged in the second opening 26, dyed layer 62, consists of.

In first substrate 21, the first pixel electrode 31 is electrically connected via the TFT 39 that is switching device.Form the first pixel electrode 31 and make to extend on the first opening 25 and the second opening 26, as common pixels electrode.Because the pixel electrode 31 in the first opening 25 and the second opening 26 is formed on according in the identical layer of this exemplary embodiment, so pixel electrode 31 can be formed monolithic.

Remaining structure is identical with aforesaid the first exemplary embodiment and the second exemplary embodiment substantially.

The material of dyed layer 62 is the dielectrics with specific inductive capacity, and therefore gives public electrode 33 additional capacitors.Because the first opening 25 does not have dyed layer 62, so the additional capacitor C1cf of the public electrode 33 corresponding with the first opening 25 and there is following relation with the additional capacitor C2cf of the corresponding public electrode 33 of the second opening.

(the additional capacitor C1cf of the public electrode 33 of the first opening 25) < (the additional capacitor C2cf of the public electrode 33 of the second opening 26)

Therefore, because the additional capacitor in the second opening 26 is greater than the additional capacitor of the public electrode 33 in the first opening 25, so the second opening 26 has the relevant threshold voltage of the variation to light transmission of the V-T characteristic larger than the first opening 25.This produces poor in V-T characteristic between the first opening and the second opening, and therefore can obtain the effect (referring to Fig. 6) similar with the first exemplary embodiment.

According to this exemplary embodiment, not in the situation that first substrate 21 sides increase the number of pixel electrode, can obtain the effect similar with the first exemplary embodiment, and therefore improve output and realize cost reduction.In addition, this exemplary embodiment only needs to form through hole as high-transmission rate region 27, and therefore can reduce the number of technique.In addition, owing to not needing to be provided for individually adding the region of coupling capacitance in point, so easily carry out layout and can obtain high light transmission under high aperture.

In addition, planar film can be arranged on liquid crystal layer 12 sides of second substrate 22.In this exemplary embodiment, the specific inductive capacity of planar film is preferably less than the specific inductive capacity of dyed layer 62 to effectively utilize the specific inductive capacity of dyed layer 62.

[exemplary embodiment 6]

The 6th exemplary embodiment according to liquid crystal display cells of the present invention will be described.

Figure 19 is according to the top view of the 6th exemplary embodiment of liquid crystal display cells of the present invention.Figure 20 is the schematic diagram of the xsect in the A-A ' direction being illustrated in Figure 19.Will omit the description of the assembly identical with the assembly of aforesaid exemplary embodiment.

As shown in Figure 19 and Figure 20, the through hole of a plurality of small sizes is dispersed in the region that is arranged in the first opening 25 as high-transmission rate region 27.

Remaining structure is substantially identical with the second exemplary embodiment with aforesaid the first exemplary embodiment.

The same with aforementioned other exemplary embodiment, when the direction through hole along wherein gate line extends is formed slit-like, when observing display panels from upper surface, display panels equally occurs along the band pattern of the direction image width that wherein data line 49 extends.Therefore, through the light of through hole, be observed as band pattern longitudinally and display quality is lowered.Yet according to this exemplary embodiment, the light through through hole disperses and launches by being dispersed the small through hole of arranging.This makes to be difficult to identify longitudinal band pattern visually, and therefore can improve picture quality.The pattern that is arranged on a plurality of through holes in the region of the first opening 25 can have arbitrarily shape and can be arranged in dispersedly in the region of the first opening 25 equably.According to the pixel size of display panels, preferably suitably adjust number and the area of through hole.

[exemplary embodiment 7]

The 7th exemplary embodiment according to liquid crystal display cells of the present invention will be described.

Figure 21 is according to the schematic configuration figure of the point of the 7th exemplary embodiment of liquid crystal display cells of the present invention.Figure 22 is the schematic diagram in the A-A ' direction of the liquid crystal display cells in Figure 21.Will omit the description of the assembly identical with the assembly of aforesaid exemplary embodiment.

As shown in Figure 21 and Figure 22, be arranged on the manhole that high-transmission rate region 27 in the first opening 25 is formed radius r.Owing to not having this manhole of determining to there is concrete area, so can change the area of manhole by suitably adjusting the size of radius r.In addition, according to Luminance Distribution backlight a plurality of manholes that can distribute in the first opening 25.

Remaining structure is substantially identical with the second exemplary embodiment with aforesaid the first exemplary embodiment.

As mentioned above, compare with painted areas 28, being formed on through hole in the first opening 25 is suitable large to coming from the optical transmission efficiency of backlight, and therefore occurs significantly the inhomogeneous of transmitted light.The inhomogeneous of transmitted light given prominence to especially during white demonstration, inhomogeneous in the very possible brightness of identifying back light visually, and display quality worsens.

Especially in the side impact type (edge-light type) with the white light-emitting diode (LED) that is attached to light guide panel side is backlight, near White LED, likely there is the inhomogeneous of brightness.Therefore, by (from a side impact in the situation that) the opposition side of White LED of (from two side impact in the situation that) in the small size and the core by the back light away from White LED of through hole or back light is set near the White LED at backlight, large-area through hole is set, can reduces the inhomogeneous of back light and the liquid crystal display cells with outstanding display quality is provided.

In addition,, when a plurality of small through holes are arranged in the first opening 25, as shown in Figure 19, according to the brightness irregularities of back light, make the number of small through hole or its area distributions can reduce brightness irregularities equally in display panels.For example, LED in backlight according to side impact type arranges, may there is Luminance Distribution (brightness irregularities), but by adjustment, be arranged on number and the area of a through hole in point, according to aforesaid Luminance Distribution backlight, can realize the optimization for each pixel.Reduce the via densities near the region of LED and increase making light almost can not pass the display panels in LED (backlight) side away from the via densities in the region of LED, and light is easily passed away from the display panels in the region of LED.This homogenising from the Luminance Distribution of the light of the surface emitting of display panels.The LED being installed on backlight is not limited to White LED, but can also be combined red, green and blue led backlight.

The shape of through hole is not limited to concrete shape, and still, as long as the area of the through hole of each pixel has the corresponding plane distribution of the brightness irregularities of the light source in the plane with display panels, any shape is all acceptable.In addition, can also construct the shape of through hole by the various shape of combination, and the shape of through hole can be set according to pixel layout.Even if pixel has the concrete shape except square, this also allows effectively to arrange through hole and can improve aperture opening ratio.

[exemplary embodiment 8]

Will describe as using according to the projector apparatus of the example of the liquid crystal display of liquid crystal display cells of the present invention.

Figure 23 illustrates the schematic configuration figure of projector apparatus, and it is to use according to the example of the display device of liquid crystal display cells of the present invention.Projector apparatus according to the present invention is to use according to the projector apparatus of in the liquid crystal display cells of above-mentioned the first exemplary embodiment to the seven exemplary embodiments.

As shown in Figure 23, the veneer projector apparatus that projector apparatus 74 according to the present invention is comprised of light source 70, concave-convex lens 71, Fresnel Lenses 72, liquid crystal display cells 11 and projecting lens 73.

For light source 70, for example, use Halogen lamp LED, xenon lamp, metal halide lamp or ultrahigh pressure mercury lamp (UHE lamp).Can also use LED.

By concave-convex lens 71 and Fresnel Lenses 72, assemble from the light of light source 70 transmittings, and be introduced into liquid crystal display cells 11.Under these circumstances, liquid crystal display cells 11 is arranged and makes light from second substrate 22 side impact of liquid crystal display cells 11.The brightness of the light of launching from projector light source 70 light very strong and that ought launch from projector light source 70 is directly radiated at TFT 39, likely occurs the leakage of light.In being applied to the liquid crystal display cells 11 of this exemplary embodiment, because TFT 39 is covered by black matrix" 61, so when light is during from second substrate 22 side impact, black matrix" 61 is shield light and reduce the leakage of the light of TFT 39 fully.

By Fresnel Lenses 72 and projecting lens 73, adjust optically the light that passes liquid crystal display cells 11, and launch from projector apparatus 74.The light of launching from projector apparatus 74 can be projected screen with display video.

Black matrix" 61 is catoptrical material preferably.By black matrix" 61, absorbing the light from second substrate 22 side impact as above makes the temperature of LCD intralamellar part increase and cause liquid crystal material or coloring components to worsen.Reflecting material can reduce heat generation and improve reliability for black matrix" 61.In addition, half anti-eyeglass material (half-mirror sheet) can be inserted between black matrix" 61 and light source 70 to reduce thermal absorption.Half anti-eyeglass material can be bound up with polarization element and be disposed on the surface of liquid crystal display cells 11.

The liquid crystal display cells 11 that application has the high light transmission efficiencies of describing in above-mentioned exemplary embodiment makes it possible to provide the projector apparatus 74 with outstanding forward direction brightness and contrast.In addition, the use of liquid crystal display cells 11 can suppress the brightness of light source, easily realizes low power consumption and can be suitable for using in little projector apparatus.Compare with painted areas 28, the high-transmission rate region 27 that is equipped with through hole has less light absorption, and can reduce the temperature increase in display panels, and therefore can suppress to reduce and improve reliability because tone reduces the colourity causing.

According to the optical system of projection display devices 74 of the present invention, be not limited to this exemplary embodiment, still, can also use suitably other optical system, as long as liquid crystal display cells 11 according to the present invention is applied to this optical system.

Especially when using such as the such some light emitting-type light source 70 of Halogen lamp LED, xenon lamp or metal halide lamp, and in the situation that the liquid crystal display cells 11 of describing in the 6th exemplary embodiment is the same, preferably use a plurality of through holes of dispersion.In aforesaid some light emitting-type light source, Guang Cong disperses at center rapidly, and the therefore Luminance Distribution increase in plane when light impacts in the plane at display panels.Specially pass through the demonstration image of projecting lens projective amplification projector apparatus, and therefore likely considerably give prominence to from the brightness irregularities of the light of display panels transmitting.Therefore, can provide the projector apparatus that improves significantly display quality combining with liquid crystal display cells 11, in liquid crystal display cells 11, according to the Luminance Distribution of backlight, form through hole.

In addition, the example of liquid crystal drive scheme comprises that copline switching (IPS) scheme, fringing field as horizontal component of electric field scheme switch (FFS) scheme, senior fringing field switching (AFFS) scheme.On the other hand, the example of vertical orientated scheme comprises multi-domain vertical alignment (MVA) scheme, pattern vertical orientated (PVA) scheme, senior super V (ASV) scheme that wherein multidomain field angle dependency is reduced.In addition, can also preferably use optical compensation curved (OCB) scheme, film compensation TN type display panels.

Liquid crystal display cells of the present invention is adapted at such as using in the display element of the such portable terminal of mobile phone, PDA (personal digital assistant), game machine, digital camera, video camera and video player or the display element such as personal computer, Automatic Teller Machine and the vending machine of notebook-sized or the such terminal device of projector.

The present invention can increase the light transmission of the whole panel of liquid crystal display cells, and therefore can increase forward direction brightness and contrast.In addition, the present invention prevents that picture quality from reducing in middle gray scale levels.

Although reference example embodiment describes and shows particularly the present invention, the invention is not restricted to these embodiment.It will be appreciated by those skilled in the art that in the situation that do not depart from as by the scope and spirit of the present invention that claim limited, can carry out the various modifications on pattern.

Claims (11)

1. a liquid crystal display cells, comprising:

First substrate, described first substrate at least comprises a plurality of pixel electrodes and the switching device being laminated on together;

Second substrate, described second substrate strides across liquid crystal layer towards described first substrate, at least comprises the public electrode and the dyed layer that are laminated on together; And

Point, described point is equipped with: the first opening, described the first opening at least comprise by many gate lines and many data lines around and the described switching device that is arranged on the infall between described gate line and described data line and the first pixel electrode arranging via described switching device, described many gate lines are arranged in parallel on described first substrate and are evenly spaced apart, and described many data lines are arranged in parallel and are evenly spaced apart to intersect with described gate line; With the second opening, described the second opening at least comprises the second pixel electrode and control electrode, in described the first opening the threshold voltage relevant to variation in light transmission be different from described the second opening with light transmission in the relevant threshold voltage of variation,

Wherein said the first pixel electrode is connected to described switching device, control electrode and storage capacitor electrode, described the second pixel electrode strides across semiconductor film in the face of described control electrode, and described the first pixel electrode and described the second pixel electrode are formed in identical layer.

2. a liquid crystal display cells, comprising:

First substrate, described first substrate at least comprises a plurality of pixel electrodes and the switching device being laminated on together;

Second substrate, described second substrate strides across liquid crystal layer towards described first substrate, at least comprises the public electrode and the dyed layer that are laminated on together; And

Point, described point is equipped with: the first opening, described the first opening at least comprise by many gate lines and many data lines around and the described switching device that is arranged on the infall between described gate line and described data line and the first pixel electrode arranging via described switching device, described many gate lines are arranged in parallel on described first substrate and are evenly spaced apart, and described many data lines are arranged in parallel and are evenly spaced apart to intersect with described gate line; With the second opening, described the second opening at least comprises the second pixel electrode and control electrode, in described the first opening the threshold voltage relevant to variation in light transmission be different from described the second opening with light transmission in the relevant threshold voltage of variation,

Wherein said the first pixel electrode and described the second pixel electrode are to consist of identical electrode, and the described dyed layer of described second substrate is positioned to than the more close described liquid crystal layer of described public electrode.

3. a liquid crystal display cells, comprising:

First substrate, described first substrate at least comprises a plurality of pixel electrodes and the switching device being laminated on together;

Second substrate, described second substrate strides across liquid crystal layer towards described first substrate, at least comprises the public electrode and the dyed layer that are laminated on together; And

Point, described point is equipped with: the first opening, described the first opening at least comprise by many gate lines and many data lines around and the described switching device that is arranged on the infall between described gate line and described data line and the first pixel electrode arranging via described switching device, described many gate lines are arranged in parallel on described first substrate and are evenly spaced apart, and described many data lines are arranged in parallel and are evenly spaced apart to intersect with described gate line; With the second opening, described the second opening at least comprises the second pixel electrode and control electrode, in described the first opening the threshold voltage relevant to variation in light transmission be different from described the second opening with light transmission in the relevant threshold voltage of variation,

Wherein said the second pixel electrode via protection dielectric film be formed on more than described the first pixel electrode layer in, and described the second pixel electrode and described the first pixel electrode partly overlapped via described protection dielectric film.

4. a liquid crystal display cells, comprising:

First substrate, described first substrate at least comprises public electrode, pixel electrode and the switching device being laminated on together, described public electrode and described pixel electrode have comb teeth-shaped, and the broach of described public electrode and the broach of described pixel electrode are alternately arranged in the horizontal direction;

Second substrate, described second substrate strides across liquid crystal layer towards described first substrate, at least comprises the dyed layer being laminated; And

Point, described point is equipped with: the first opening, described the first opening at least comprise by many gate lines and many data lines around and the described switching device that is arranged on the infall between described gate line and described data line, described many gate lines are arranged in parallel on described first substrate and are evenly spaced apart, and described many data lines are arranged in parallel and are evenly spaced apart to intersect with described gate line; With the second opening, described public electrode in described the first opening and the electrode separation between described pixel electrode are different from described public electrode in described the second opening and the electrode separation between described pixel electrode, and in described the first opening, the threshold voltage relevant to light transmission is different from described the second opening the threshold voltage relevant with light transmission.

5. liquid crystal display cells according to claim 4, the described public electrode in wherein said the first opening and the electrode separation between described pixel electrode are greater than described public electrode in described the second opening and the electrode separation between described pixel electrode.

6. liquid crystal display cells according to claim 4, wherein drives described liquid crystal display cells based on horizontal component of electric field drive scheme.

7. a liquid crystal display cells, comprising:

First substrate, described first substrate at least comprises: be laminated on public electrode, pixel electrode and switching device together, protection dielectric film is arranged between described pixel electrode and described public electrode, and described public electrode is comb teeth-shaped;

Second substrate, described second substrate strides across liquid crystal layer in the face of described first substrate, at least comprises the dyed layer being laminated; And

Point, described point is equipped with: the first opening, described the first opening at least comprise by many gate lines and many data lines around and the described switching device that is arranged on the infall between described gate line and described data line, described many gate lines are arranged in parallel on described first substrate and are evenly spaced apart, and described many data lines are arranged in parallel and are evenly spaced apart to intersect with described gate line; With the second opening,

Described pixel electrode is inserted between the described public electrode of adjacency in horizontal direction in described the first opening, and described pixel electrode extends to cover described the second opening in described the second opening in described horizontal direction, and in described the first opening the threshold voltage relevant to variation in light transmission be different from described the second opening with light transmission in the relevant threshold voltage of variation.

8. liquid crystal display cells according to claim 7, the spacing between the described public electrode in wherein said the first opening is greater than the spacing between the described public electrode in described the second opening.

9. liquid crystal display cells according to claim 7, wherein drives described liquid crystal display cells based on fringing field handover scheme.

10. a liquid crystal display cells, comprising:

First substrate, described first substrate at least comprises a plurality of pixel electrodes and the switching device being laminated on together;

Second substrate, described second substrate strides across liquid crystal layer towards described first substrate, at least comprises the public electrode and the dyed layer that are laminated on together; And

Point, described point is equipped with: the first opening, described the first opening at least comprise by many gate lines and many data lines around and the described switching device that is arranged on the infall between described gate line and described data line and the first pixel electrode arranging via described switching device, described many gate lines are arranged in parallel on described first substrate and are evenly spaced apart, and described many data lines are arranged in parallel and are evenly spaced apart to intersect with described gate line; With the second opening, described the second opening at least comprises the second pixel electrode and control electrode, in described the first opening the threshold voltage relevant to variation in light transmission be different from described the second opening with light transmission in the relevant threshold voltage of variation,

Wherein said the first opening has the high-transmission rate region that its light transmission is greater than the described dyed layer of described the second opening.

11. liquid crystal display cells according to claim 10, the described high-transmission rate region of wherein said the first opening comprises the through hole being arranged in described dyed layer.

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