JP2001281619A - Color liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color liquid crystal display device, in which generation of display failures or the like can be suppressed and difference in the quantity of transmitted light by the wavelength in pixels can be compensated for. SOLUTION: A color filter 12 having color plates R, G, B, top coat 13, counter electrode 14 and alignment film 15 are successively deposited on a substrate 11. A step-forming film 3, having different film thickness corresponding to the color plates R, G, B, is formed on a substrate 1 and lines 2 facing the substrate 11. Pixel electrodes 4 are formed on the step-forming film 3 and the upper faces are covered with an alignment film 5 and planarized. The alignment film 5 is formed to have the film thickness dP'(R), dP'(G), dP'(B) corresponding to the color plates R, G, B. Each film thickness is determined, in such a manner that the difference in the quantity of transmitted light by the wavelength is compensated for the halftone range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color liquid crystal display device, and more particularly, to a color liquid crystal display device which, when incident light passes through a liquid crystal, reduces variations in optical characteristics depending on its wavelength.

[0002]

2. Description of the Related Art As a conventional general color liquid crystal display device, a normally white twisted nematic (T) is used.
The structure of the N) type color liquid crystal display device will be described with reference to FIG.

FIG. 7 is a sectional view of such a TN type color liquid crystal display device. As shown in FIG. 7, in the color liquid crystal display device, a pixel electrode 104 and a wiring 102 for connecting the pixel electrode 104 to a power supply (not shown) are formed on a substrate (glass substrate) 101 side. Incidentally, the upper part of the substrate 101 and the wiring 102 is covered with an insulating film 103, and the upper part of the pixel electrode 10
4 are formed. An alignment film 105 is formed above the insulating film 103 and the pixel electrode 104.

On the other hand, a substrate (glass substrate) facing this
A color filter 112 having R (red), G (green), and B (blue) color plates and a top coat 113 are formed on the 111 side, respectively. The alignment films 115 are sequentially deposited and formed.

[0005] These substrates 101 and 111 are
In the mode shown in FIG. 7, they are arranged to face each other with a gap of length d, and this gap is filled with liquid crystal 120. Furthermore,
Outside the substrates 101 and 111, the first
And the second polarizing plate 132 are disposed such that the polarization directions are orthogonal to each other.

In the color liquid crystal display device having such a structure, the incident light from the first polarizing plate 131 undergoes an optical change when passing through the liquid crystal 120 and then undergoes a second change. Is transmitted or blocked by the polarizing plate 132. The transmittance T of light from the second polarizing plate 132 is given by u = 2dΔn / λ according to the length d of the gap, the wavelength λ of the incident light, and the refractive index anisotropy Δn of the liquid crystal. It is represented by equation (1). T = 1−sin ² {(1 + u ² ) ^1/2 × (π / 2)} / (1 + u ² ) (1) FIG. 8 is a graph showing the above equation (1).

As can be seen from FIG. 8 and the above equation (1),
In order to maximize the amount of transmitted light, u ² should be 3, 15, 35,
You need to ... By setting u ² in this way, the amount of transmitted light can be maximized when no voltage is applied,
As a result, the contrast can be optimized. Therefore, normally, under the condition that the transmittance T becomes maximum first (in this case, u ² = 3), and the green color having the highest visibility among the primary color lights (red light R, green light G, and blue light B) is usually used. The color liquid crystal display device is designed according to the wavelength of the light G.

[0008] However, if the green light G is designed to have the best contrast, the other blue light B and red light R are not designed to have the best contrast. That is, if Δnd is constant, u changes depending on the wavelength λ, so that the blue light B and the red light R are compared with the transmitted light amount of the green light G when no voltage is applied.
Is low.

FIG. 9 shows the relationship between the applied voltage and the transmittance of red light R, green light G, and blue light B of the color liquid crystal display device designed so that the contrast of green light G is the best. Show. As shown in FIG. 9, since the amount of transmitted green light G (solid line) is designed to be maximum when no voltage is applied, the blue light B (two-dot chain line) and the red light R
The amount of transmitted light (dashed line) is lower than that.
In addition, the voltage (V90,
V50) is a red light R, a green light G, and a blue light B.

Therefore, conventionally, to solve such a problem, the alignment film 105 of the color liquid crystal display device illustrated in FIG.
For example, the thickness d of the top coat 113 on the pixel corresponding to each of the color plates R, G, and B of the color filter 112 is changed by changing the length d of the gap between the pixel and the alignment film 115 (Japanese Patent Application Laid-Open No. 7-1).
No. 75050) or the color filter 11
2 by changing the layer thicknesses of the color plates R, G, and B (see JP-A-6-347802), the gaps dr, dg,
A so-called multi-gap method for setting db has also been proposed. Thus, the color plates R,
By setting different gaps dr, dg, and db for the pixels corresponding to G and B, the ratio d between the wavelengths λr, λg, and λb is set.
r / λr, dg / λg, and db / λb can be matched, and the difference in the amount of transmitted light depending on the wavelength can be compensated.

[0011]

According to the multi-gap method, in principle, the difference between the amounts of transmitted light of the red light R, the green light G, and the blue light B can be almost completely compensated in principle. Become. However, in the color liquid crystal display device having such a structure, the following problems in manufacturing due to the fact that the gap of the alignment film is set to different lengths between the pixels corresponding to the color plates R, G, and B. Problems such as can not be ignored.

That is, in the case of such a structure, the color plates R,
Since the step of each pixel portion corresponding to G and B is as large as about 1 μm, there is a concern that when printing the alignment film, the alignment film is cut off and peeled off in the subsequent rubbing step. When such peeling occurs in the alignment film, the liquid crystal display device also suffers from poor alignment, resulting in poor display, and the yield is greatly deteriorated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a color liquid crystal display capable of compensating for the difference in the amount of transmitted light due to the wavelength between pixels while suppressing the occurrence of display defects and the like. It is to provide a device.

[0014]

The means for achieving the above object and the effects thereof will be described below. According to the first aspect of the present invention, the first substrate provided with the first electrode and the second substrate provided with the second electrode are disposed to face each other with an alignment film and a liquid crystal layer interposed therebetween. And a voltage applied between the first electrode and the second electrode in a color liquid crystal display device in which one of the substrates is provided with a color filter having a color plate transmitting each primary color light. The gist of the present invention is to provide a partial pressure value correcting means for correcting a divided voltage value of a voltage to be divided into the liquid crystal layer according to each color plate of the color filter.

Since the alignment direction of the liquid crystal depends on the divided voltage value of the voltage divided into the liquid crystal layer, by controlling the divided voltage value, it is possible to control the characteristics of light transmitted through the liquid crystal. . For this reason, according to the above configuration, the first electrode and the second electrode
By correcting the divided voltage value divided into the liquid crystal layer by the voltage applied between the electrodes corresponding to each color plate, it is possible to efficiently compensate for the difference in the amount of transmitted light due to the above-described wavelength. become. Then, regarding the correction of the partial pressure value,
Since there is no necessity to provide a large step between each corresponding pixel in the color plate transmitting each primary color light, the above-described disadvantages caused by providing such steps are preferably avoided.

According to a second aspect of the present invention, in the first aspect of the present invention, the partial pressure value correcting means controls the partial pressure value correction so that the amount of light transmitted through each color plate of the color filter is at least equal in a halftone region. The gist of the invention is to correct the divided voltage value of the voltage divided into the liquid crystal layer by the voltage applied between the first electrode and the second electrode.

A region where the amount of transmitted light is at an intermediate value, that is, a halftone region is particularly important for improving color reproducibility. In this regard,
According to the above configuration, when the voltage applied between the first electrode and the second electrode is the same, by adjusting the transmitted light amount of each primary color light in this halftone region to be equal, A display device with the best color reproducibility can be obtained.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the partial pressure value correcting means includes a dielectric film having a different thickness corresponding to each color plate of the color filter. The gist of the present invention is that it is provided between the first electrode and the second electrode.

In the case where a voltage having a predetermined voltage value is applied between the first electrode and the second electrode, if a plurality of members are provided between the two electrodes, the voltage applied to each member is It also changes depending on the relative ratio of the film thickness of the plurality of members.

In this regard, according to the above configuration, a dielectric film having a different thickness corresponding to each color plate is provided between the first electrode and the second electrode, thereby simplifying the partial pressure value correcting means. Can be configured.

According to a fourth aspect of the present invention, in the third aspect, the dielectric film has a flat surface. According to the above configuration, since the surface of the dielectric film is flattened, the above-described problem of the defect of the alignment film can be more preferably avoided.

According to a fifth aspect of the present invention, in the fourth aspect, the dielectric film is formed as the alignment film. According to the above configuration, by using the alignment film as the dielectric film, there is no need to newly provide a film for the above purpose.

According to a sixth aspect of the present invention, in the first or the second aspect of the present invention, the partial pressure value correcting means sets different dielectric constants corresponding to the respective color plates of the color filter to the first electrode. And a dielectric film provided between the second electrodes.

The divided voltage value of the voltage divided into the liquid crystal layer changes depending on the dielectric constant of a substance interposed between the liquid crystal layer and the first electrode and between the liquid crystal layer and the second electrode. In this regard, according to the above configuration, the dielectric films having different dielectric constants corresponding to the respective color plates are formed between the first electrode and the second electrode. The value correcting means can be easily configured.

According to a seventh aspect of the present invention, in the sixth aspect, the dielectric film is formed as the color filter. According to the above configuration, by using a color filter as the dielectric film, the partial pressure value correction unit can be configured without providing a new member.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a color liquid crystal display device according to the present invention is embodied as a normally white TN type liquid crystal display device will be described below with reference to FIGS.

FIG. 1 is a sectional view of a color liquid crystal display device of the present embodiment. As shown in FIG. 1, a color filter 12 having R (red), G (green), and B (blue) color plates and a top coat 13 are formed on the substrate 11 side. A counter electrode 14 and an alignment film 15 having a predetermined alignment direction are sequentially formed on the surface of the top coat 13.

On the other hand, on the side of the substrate 1 facing the substrate 11,
A wiring 2 for connecting a power supply (not shown) and the pixel electrode 4 is formed. Further, a step forming film 3 having steps formed in regions corresponding to the color plates R, G, and B is formed above the substrate 1 and the wiring 2. A pixel electrode 4 is formed on the step forming film 3, and an alignment film 5 having an alignment direction orthogonal to the alignment direction of the alignment film 15 is formed thereon.
Are formed. As shown in FIG. 1, the alignment film 5 has different thicknesses d _{p ′} (R), d _{p ′} (G), and d _{p ′} (R) for each of the regions corresponding to the color plates R, G, and B, respectively. d _{p '}
(B).

The substrate 1 and the substrate 11 are arranged in the manner shown in FIG. 1, and a liquid crystal 20 is filled between the alignment films 5 and 15. In addition, these substrates 1 and 1
A first polarizing plate 31 and a second polarizing plate 32 are arranged outside the first polarizing plate 1 so that their polarizing directions are orthogonal to each other.

By forming the first polarizing plate 31 and the second polarizing plate 32 as described above, the optical characteristics of incident light from the first polarizing plate 31 can be changed by the liquid crystal 20. , The second polarizing plate 32 transmits or blocks.

The liquid crystal 20 includes a pixel electrode 4 and a counter electrode 1
In a state where no voltage is applied to the alignment film 5 and the liquid crystal in the vicinity of the alignment film 5, the alignment direction of the alignment film 5 and its director coincide with each other. They are arranged to approximate the direction. As described above, the alignment film 5 to the alignment film 15
, The director of the liquid crystal 20 has a 90 ° twist.

On the other hand, when a voltage is applied to the pixel electrode 4 and the counter electrode 14, the director of the liquid crystal 20 gradually turns to the direction perpendicular to the alignment film 5 (the alignment film 15).
As described above, when the voltage is applied and the director of the liquid crystal 20 is perpendicular to the alignment film 5, the incident light incident from the first polarizing plate 31 changes its polarization direction when transmitting through the liquid crystal 20. To prevent this, the second polarizing plate 32 blocks the light.

Here, by gradually decreasing the applied voltage value, the director of the liquid crystal 20 gradually becomes oriented in the above-mentioned orientation in which no voltage is applied. Accordingly, the amount of transmitted light transmitted from the second polarizing plate 32 gradually increases, and reaches a maximum when no voltage is applied.

However, the amount of transmitted light for a predetermined applied voltage value varies depending on the wavelength of light incident from the first polarizing plate 31 as described above. Therefore, in this embodiment,
The divided values of the voltage divided into the liquid crystal 20 by the voltage applied between the pixel electrode 4 and the counter electrode 14 are the color plates R, G, and B.
The thickness d _{p ′} (R),
By setting d _{p ′} (G) and d _{p ′} (B), the difference in transmitted light amount due to the wavelength of light is compensated.

The principle of compensating for the difference in the amount of transmitted light using the difference in the partial pressure values, that is, the difference in the film thickness, in this embodiment will be described with reference to FIG. As shown in FIG. 2, the liquid crystal 20 is filled between the pixel electrode 4 and the counter electrode 14 via the alignment films 5 and 15.

[0036] Here, in the present embodiment, which an alignment film 5 is a dielectric film a means for correcting the divided voltage value, the film thickness d _{p 'of} the alignment film 5, the pixel electrode from the power source 40 The voltage divided between the liquid crystal 20 is adjusted (corrected) by the voltage applied between the counter electrode 4 and the counter electrode 14. The divided voltage value of the voltage divided into the liquid crystal 20 is calculated as follows.

As shown in FIG. 2, the relative permittivity ε _LC of the liquid crystal 20 and its layer thickness d _LC , and the relative permittivity ε _LC of the alignment film 5
_{When p} and its thickness d _{p ′} , relative dielectric constant ε _p of the alignment film 15 and its thickness d _p , vacuum dielectric constant ε ₀ , and surface area S of the pixel electrode 4, the capacitance C _{LC of the} liquid crystal 20 is obtained. , the capacity of the alignment films 5 C _{p ',} capacitance C _p of the alignment film 15 each of which is calculated as follows.

C _LC = ε ₀ ε _LC S / d _LC C _{p ′} = ε ₀ ε _{p ′} S / d _{p ′} C _p = ε ₀ ε _p S / d _p where the pixel electrode 4 and the counter electrode 14 The electric charge Q stored in the vicinity of the pixel electrode 4 of the alignment film 5 or in the vicinity of the counter electrode 14 of the alignment film 15 when a voltage having the voltage value V is applied during
It is represented by the following equation.

[0039]

(Equation 1) This charge Q is in the vicinity of the liquid crystal 20 of the alignment film 5 or the alignment film 15.
, The voltage value V _LC applied to the liquid crystal 20 is represented by the following equation.

[0040]

(Equation 2) Therefore, the divided voltage value V _LC divided by the liquid crystal 20 is equal to the applied voltage value V _LC applied between the pixel electrode 4 and the counter electrode 14.
And a difference (voltage shift amount) represented by the following equation.

[0041]

(Equation 3) Therefore, in the present embodiment, the difference in the amount of transmitted light described above is compensated for by adjusting (correcting) the voltage shift amount V- _VLC .

Next, specific tuning of the voltage shift amount V- _VLC will be described with reference to FIGS.
In the present embodiment, the relative dielectric constants ε _p of the alignment films 5 and 15, the thickness d _{p of} the alignment film 15, and the thickness d _{p ′} of the alignment film 15 corresponding to each of the color plates R, G, and B ( R), d _{p '} (G), d _p'
(B) is set as follows.

Ε _p = 3.2 d _p = 0.06 (μm), d _{p '} (R) = 0.34
(Μm), d _{p ′} (G) = 0.22 (μm), d _{p ′} (B)
= 0.06 (μm) Further, the relative dielectric constant of the liquid crystal 20 is expressed by the parallel component ε
‖ And the vertical component ε⊥ are ε‖ = 6.1 and ε⊥ = 3.7, respectively, and when the angle between the director of the liquid crystal 20 and the direction of the electric field is θ, the relative permittivity ε _LC of the liquid crystal is , Represented by the following equation.

Ε _LC = ε‖sin ² θ + ε⊥cos ² θ As described above, the value of the relative dielectric constant ε _LC of the liquid crystal 20 changes depending on the orientation of the liquid crystal 20. Therefore, here, in order to roughly estimate the voltage shift amount V- _VLC , the value θ is estimated for each transmittance, assuming that the orientation mode of the liquid crystal 20 corresponds to a change in optical characteristics.

More specifically, as shown in FIG. 4, the relationship between the transmittance and the average value of the applied voltage value at that time is obtained using a plurality of samples of an actual liquid crystal display device satisfying the above conditions. . And each transmittance is 0%, 10%, 50%, 90%
%, The average applied voltage values V ₀ , V ₁₀ , V ₅₀ , and V ₉₀ are measured and calculated. The angles θ between the director of the liquid crystal 20 and the direction of the electric field when the average applied voltage values V ₀ , V ₁₀ , V ₅₀ , and V ₉₀ are applied are respectively 90 °, 81 °, 45 °, Assume 9 °.

Under such an assumption, first, the relative dielectric constant ε _LC of the liquid crystal 20 is calculated. Then, using this calculated value, a compensation value of the divided voltage value applied to the liquid crystal 20 corresponding to each of the color plates R, G, and B, that is, a voltage shift amount is calculated. The calculation results are shown in the table of FIG.

FIG. 5 is a graph showing the relationship between the amount of voltage shift corresponding to each of the color plates R, G, and B and the applied voltage V applied between the pixel electrode 4 and the counter electrode 14. Also,
FIG. 6 is a graph in which this voltage shift amount is converted based on the voltage shift amount corresponding to the color plate G. Next, the role of this voltage shift will be described with reference to FIGS. 5, 6 and FIG.

As shown in FIG. 9, when a predetermined voltage of 1.5 V or more is applied, the transmittance of blue light B (dotted line) exceeds the transmittance of green light G (solid line). Therefore,
As shown in FIG. 5 and FIG. 6, the liquid crystal 2 corresponding to the color plate B has a smaller divided voltage than the divided voltage value of the liquid crystal 20 corresponding to the color plate G.
The divided voltage value to be divided to 0 is set to be larger (the voltage shift amount is smaller).

Under the above conditions, the red light R (dashed line)
Is lower than the transmittance of the green light G (solid line). Therefore, as shown in FIGS. 5 and 6, the divided voltage value divided into the liquid crystal 20 corresponding to the color plate R is larger than the divided voltage value divided into the liquid crystal 20 corresponding to the color plate G. It is set small (the voltage shift amount is large). Thus, the color plate R,
By changing the relative value of the voltage divided into the liquid crystal 20 corresponding to each of G and B, the variation in the transmittance of the red light R, the green light G, and the blue light B can be reduced.

FIG. 3 shows the relationship between the applied voltage applied between the pixel electrode 4 and the counter electrode 14 and the transmittance in the liquid crystal display device of this embodiment. As shown in FIG. 3, a red light R (dotted line) and a green light G
(Solid line) and blue light B (two-dot chain line) show characteristics whose transmittance is more similar to that shown in FIG. 9 for each applied voltage value. In particular, in a halftone region (around 50% transmittance), which is important for improving color reproducibility, since the characteristics are almost the same, the difference in the amount of transmitted light depending on the wavelength of each light is completely compensated. Become like

Next, a method of manufacturing such a color liquid crystal display device will be outlined below. In this manufacturing method, first, a wiring 2 is formed on a substrate 1 shown in FIG.
After forming an SOG film of about 1 μm, it is flattened. next,
The photolithography technique is performed in two steps, and the SOG film in the region corresponding to the color plate G is changed to the SOG film in the region corresponding to the color plate B.
The SOG film in the region corresponding to the color plate R is etched 0.12 μm deeper than the SOG film in the region corresponding to the color plate G by 0.16 μm. Thereby, the step forming film 3 is formed.

After the step forming film 3 is formed, a pixel electrode 4 is formed to a thickness of about 0.1 μm corresponding to each color plate. Further, a film to be an alignment film 5 is applied above the step forming film 3 and the pixel electrode 4 by a spin coating method, and the surface thereof is flattened. Here, since the film is formed such that the film thickness corresponding to the color plate B is 0.06 μm, the film thickness corresponding to the color plate G is 0.22 μm, and the film thickness corresponding to the color plate R is 0.1 μm. It is formed to 34 μm. Note that the step formed by the step forming film 3 is not so large as the step required by the multi-gap method, so that the flattening can be easily performed.

On the other hand, the substrate 11 side is formed by a known technique. Then, an alignment process is performed on each substrate to form an alignment film 5 and an alignment film 15. Furthermore, a spacer is sprayed on one substrate, and a sealing resin is applied on the other substrate,
Laminate both substrates. Then, by curing the sealing material and injecting the liquid crystal 20 into the gap, the color liquid crystal display device shown in FIG. 1 is completed.

As described above, according to the color liquid crystal display device of the present embodiment, the following effects can be obtained. (1) Since the thickness of the alignment film 5 formed on the pixel electrode 4 is set to be different for each region corresponding to the color plate, the voltage divided into the liquid crystal corresponding to the color plate is set. Can be adjusted (corrected), and the difference in the amount of transmitted light due to the wavelength of the incident light can be compensated.

(2) Since the step of the step forming film 3 is smaller than the step required by the multi-gap, the upper alignment film 5 can be easily formed. (3) In particular, in a halftone region where color reproducibility is remarkable under the condition that the voltages applied between the pixel electrode 4 and the counter electrode 14 are equal, red light (R) and green light (G) Since the amount of transmitted light of the blue light (B) is remarkably coincident, the difference in the amount of transmitted light due to the wavelength of each light in the same region is completely compensated for, that is, the display quality is maintained well.

(4) By adjusting the film thickness using the alignment film 5, the partial pressure value can be corrected without providing a new member. The above-described embodiment may be modified and implemented as follows.

The alignment film 5 used in the above embodiment,
The alignment film 15 and the liquid crystal 20 can be appropriately selected and used as a member having a desired relative dielectric constant. In this case, it is desirable to appropriately set the thicknesses of the step forming film 3, the alignment film 5, and the alignment film 15.

In the above embodiment, the difference in the amount of transmitted light due to the wavelength of the incident light is set to be compensated mainly in the halftone region. However, the present invention is not limited to this, and the compensation is performed intensively in a desired region. May be set as follows.

The manufacturing method shown in the above embodiment is not limited to this. In the above embodiment, the step forming film 3 is provided on the substrate 1, but may be provided on the color filter 12 side. Further, the liquid crystal display device may be configured to have the color filter 12 on the substrate 1 side.

In the above embodiment, the color plates R, G,
The alignment film 5 was used as a partial pressure value correction unit for adjusting the relative value of the voltage divided into the liquid crystal corresponding to each of B.
A dielectric film may be provided, and a color filter may be used as the dielectric film. At this time, the surfaces of these dielectric films need not be planarized. The point is that the thickness of the dielectric film provided between the pixel electrode 4 and the counter electrode 14 may be different in each region corresponding to each color plate.

In the above-described embodiment and its modifications, the voltage shift film is set so that the film thickness is different for each of the regions corresponding to the color plates R, G, and B, so that the liquid crystal 20
Are different for each of the color plates R, G, and B. However, a dielectric film having a different dielectric constant may be provided between the pair of electrodes, that is, between the pixel electrode 4 and the counter electrode 14 in each of the regions corresponding to the color plates R, G, and B. . This dielectric film does not need to be planarized. For example, a color filter may be set between the pixel electrode and the counter electrode, and the color filter may be used as the dielectric film.

Further, it is not always necessary to change at least one of the film thickness and the dielectric constant for each region corresponding to the color plate. For example, even if the film existing between the pair of electrodes is one type of film and the film thickness is constant, the gap between the liquid crystals is formed by the color plates R and R.
G and B are set so as to be slightly different in each corresponding region, and the dielectric constant of the same film or the liquid crystal is further adjusted, so that the partial pressure value divided into the liquid crystal 20 can be changed to the color plates R, G, and B can be different for each. In short, color plate R,
The setting may be such that the divided voltage value to be divided differs for each of the liquid crystals corresponding to G and B.

In addition, a normally black liquid crystal display device may be used. Further, the invention is not limited to the TN type liquid crystal display device. Further, the liquid crystal display device is not limited to the active matrix type.

[Brief description of the drawings]

FIG. 1 is a sectional view showing the structure of a first embodiment of a color liquid crystal display device according to the present invention.

FIG. 2 is an exemplary diagram illustrating a principle of correcting a partial pressure value according to the embodiment;

FIG. 3 is a graph showing the relationship between the applied voltage value and the transmittance of each primary color light of the color liquid crystal display device of the embodiment.

FIG. 4 is a view showing a list of voltage shift amounts according to the embodiment;

FIG. 5 is a graph showing a relationship between an applied voltage and a voltage shift amount according to the embodiment.

FIG. 6 is a graph showing a relationship between an applied voltage and a voltage shift amount according to the same embodiment.

FIG. 7 is a sectional view showing the structure of a conventional general color liquid crystal display device.

FIG. 8 is a graph showing a relationship between a parameter u = 2dΔn / λ and transmittance.

FIG. 9 is a graph showing a relationship between an applied voltage value and transmittance in a conventional color liquid crystal display device.

[Explanation of symbols]

1, 101: substrate, 2, 102: wiring, 3: step forming film, 4, 104: pixel electrode, 5, 15, 105, 115
... Orientation film, 11, 111 ... Substrate, 12, 112 ... Color filter, 13, 113 ... Top coat, 14, 114
... counter electrodes, 20, 120 liquid crystal, 31 first polarizing plate, 32 second polarizing plate, 40 power supply.

Claims (7)

[Claims] A first substrate provided with a first electrode and a second substrate provided with the first electrode;
A color filter having a color plate that transmits different primary color lights on one of the substrates while a second substrate on which the electrodes are provided is disposed to face each other with an alignment film and a liquid crystal layer interposed therebetween. In the color liquid crystal display device provided with, a divided voltage value of a voltage divided into the liquid crystal layer by a voltage applied between the first electrode and the second electrode is applied to each color plate of the color filter. A color liquid crystal display device comprising a partial pressure value correcting means for performing a corresponding correction. 2. The partial pressure value correcting means is applied between the first electrode and the second electrode such that the amount of light transmitted through each color plate of the color filter becomes uniform at least in a halftone region. 2. The color liquid crystal display device according to claim 1, wherein a divided voltage value of the voltage divided into the liquid crystal layer is corrected by a voltage. 3. The partial pressure value correcting means according to claim 1, wherein a dielectric film having a different thickness corresponding to each color plate of said color filter is provided between said first and second electrodes. Or a color liquid crystal display device according to 2. 4. A color liquid crystal display device according to claim 3, wherein the surface of said dielectric film is flattened. 5. The color liquid crystal display device according to claim 4, wherein said dielectric film is formed as said alignment film. 6. The partial pressure value correcting means is a dielectric film for providing different dielectric constants between the first electrode and the second electrode corresponding to each color plate of the color filter. 3. The color liquid crystal display device according to 2. 7. The color liquid crystal display device according to claim 6, wherein said dielectric film is formed as said color filter.