JPH11295707A - Liquid crystal display element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display a color image that has a satisfactory color quality by enhancing color balance of colored light of red, green and blue which are outgoing light from each area that respectively corresponds to a color filter and almost eliminating a white band color that is displayed by color mixture of the colored light of the colors. SOLUTION: A liquid crystal layer thickness adjustment film 8 which corresponds to a green filter 7G and a blue filter 7B among red, green and blue color filters 7R, 7G and 7B is provided. Here, liquid crystal layer thickness dR of an area corresponding to the filter 7R, liquid crystal layer thickness dG of an area corresponding to the filter 7G and liquid crystal layer thickness dB of an area corresponding to the filter 7B are set in such a manner that a color which is shown by the color mixture of colored light of each light that is made incident on each area of them, permeates the filters 7R, 7G and 7B, colors the color of the coloring film, also permeates a liquid crystal layer 10 and comes out of each of the areas becomes white.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device having three colored films having different transmission wavelength bands.

[0002]

2. Description of the Related Art There are various types of liquid crystal display devices such as an active matrix type and a simple matrix type. For example, an active matrix type liquid crystal display device has a pair of substrates opposed to each other with a liquid crystal layer interposed therebetween. On the inner surface of one of the substrates, a plurality of pixel electrodes arranged in a matrix, a plurality of active elements respectively connected to the pixel electrodes, and a signal supply line for supplying a signal to the active element are provided. And a counter electrode that forms a pixel region by a portion facing the plurality of pixel electrodes on the inner surface of the other substrate.

There are two types of liquid crystal display devices, one displaying a black and white image and the other displaying a color image. A liquid crystal display device displaying a multicolor image such as a full color image is provided on one of the substrates. , Three colored films (for example, three color filters of red, green, and blue) having different transmission wavelength bands are provided corresponding to each pixel region.

In the conventional liquid crystal display element, the colored films correspond to the three colored films so that colored light of the color of the colored film is emitted from the entire area of each pixel region. Each of the three color films is formed to have an area corresponding to the entire pixel region, and each of the three color films is formed to have a small transmittance in order to reduce light absorption by the color film and obtain a bright display. And

[0005]

However, in a conventional liquid crystal display device provided with a colored film, the color balance of the three colored lights, which are the light emitted from the respective regions corresponding to the three colored films, is not sufficient. Unfortunately, there is a problem that the white display displayed by the mixture of the colored lights of these colors takes on a color.

That is, for example, the three colored films are red,
In the case of three color filters of green and blue, white is red light that is light emitted from a region corresponding to the red filter;
Display is performed by an additive color mixture of green light, which is light emitted from a region corresponding to the green filter, and blue light, which is light emitted from a region corresponding to the blue filter. , The white displayed by the mixture of the blue colored lights becomes a greenish color.

The present invention improves the color balance of the three colored lights, which are the light emitted from the respective regions corresponding to the three colored films, so that the white color displayed by the mixed color of these colored lights is improved. It is an object of the present invention to provide a liquid crystal display element capable of displaying a color image of good color quality with almost no banding.

[0008]

According to a liquid crystal display device of the present invention, a plurality of first electrodes are provided on the inner surface of one of a pair of substrates opposed to each other with a liquid crystal layer interposed therebetween, and the other substrate is provided. At least one second electrode that forms a pixel region by a portion facing the plurality of first electrodes is provided on an inner surface of the substrate, and a transmission wavelength corresponding to each of the pixel regions is provided on an inner surface of any of the substrates. Three colored films having different bands are provided, and at least one of the colored films that transmits light in the middle wavelength band and the colored film that transmits light in the short wavelength band is provided on one of the substrates. And a liquid crystal layer thickness adjusting film for adjusting the layer thickness of the liquid crystal layer in a region corresponding to the colored film is provided, and a region corresponding to the colored film transmitting light in a long wavelength band is provided. Liquid crystal layer thickness, medium wavelength The liquid crystal layer thickness of the region corresponding to the colored film through which the light in the region transmits, and the liquid crystal layer thickness of the region corresponding to the colored film through which the light of the short wavelength band transmits, are incident on each of these regions, and the colored film is formed. It is set so that the color displayed by the mixed color of the colored light emitted from each of the regions through the liquid crystal layer while being transmitted and colored to the color of the colored film is white. Is what you do.

That is, the liquid crystal display device of the present invention
The transmittance of the colored light of each color which is incident on each region corresponding to the colored film of the color, passes through the colored film, is colored to that color, passes through the liquid crystal layer, and is emitted from each of the regions, It is designed to be adjusted by the wavelength dependence of the transmittance corresponding to the liquid crystal layer thickness of the region, and as described above,
A liquid crystal layer thickness adjusting film corresponding to a colored film that transmits light of at least a middle wavelength band and a colored film that transmits light of a short wavelength band among the three colored films on the inner surface of any one of the substrates. The liquid crystal layer thickness in the region corresponding to the colored film through which light in the long wavelength band is transmitted, the liquid crystal layer thickness in the region corresponding to the colored film through which light in the middle wavelength band is transmitted, and light in the short wavelength band are transmitted. The thickness of the liquid crystal layer in the region corresponding to the colored film to be formed is incident on each of these regions, passes through the colored film and is colored to the color of the colored film, and passes through the liquid crystal layer and exits from each of the regions. Since the transmittance of the colored light of each color is adjusted, the color balance of the colored light of the three colors, which is the light emitted from each region corresponding to the colored film of the three colors, is improved, and the colored light of each of these colors is improved. Good color quality with almost no white bands displayed due to color mixing Color image can be displayed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, the liquid crystal display device of the present invention has a colored film through which at least light in the middle wavelength band among the three colored films is transmitted on the inner surface of any one of the substrates. A liquid crystal layer thickness adjusting film is provided in correspondence with the colored film through which light in the band is transmitted, and the liquid crystal layer thickness in a region corresponding to the colored film through which light in the long wavelength band is transmitted, and light in the middle wavelength band is transmitted. The thickness of the liquid crystal layer in the region corresponding to the colored film and the thickness of the liquid crystal layer in the region corresponding to the colored film through which light in the short wavelength band is transmitted are incident on each of these regions and transmitted through the colored film to form the colored film. By adjusting the transmittance of the colored light of each color that is transmitted through the liquid crystal layer and emitted from each of the regions, the light is emitted from each of the regions corresponding to the three colored films. Improve the color balance of the three colors of colored light, and Eliminating most of the bands colored white displayed by color mixture, in which so as to display a color image of good color quality.

In the liquid crystal display device according to the present invention, the liquid crystal layer thickness in a region corresponding to the colored film through which the light in the long wavelength band is transmitted and the liquid crystal in the region corresponding to the colored film through which the light in the middle and long wavelength band is transmitted. The layer thickness and the liquid crystal layer thickness in a region corresponding to the colored film through which the light in the short wavelength band is transmitted are set so that the transmittance of light in each wavelength band transmitted through each colored film is maximized. If the thickness of the liquid crystal layer in each region is set as described above, the color balance of the three colored lights is good, and there is almost no white band displayed by mixing the colored lights of these colors. A color image of good color quality can be displayed, and the display can be brightened.

In the liquid crystal display device according to the present invention, each of the three colored films is formed to have an area smaller than an area of a pixel region, and a region of the pixel region which does not correspond to the colored film is a non-colored light emitting region. In this case, of the light transmitted through the pixel region, only the light transmitted through the region corresponding to the colored film may be colored by absorbing the wavelength light outside the transmission wavelength band by the colored film. The light transmitted through the non-colored light emitting area is transmitted without being absorbed by the colored film, and the colored light that is the light emitted from the area corresponding to the colored film and the light emitted from the non-colored light emitting area Since high-luminance color pixels are displayed by the high-luminance uncolored light, a color image with sufficient brightness can be displayed.

In the case where the three colored films are formed in areas smaller than the areas of the pixel regions as described above, the inner surfaces of any one of the substrates correspond to the non-colored light emitting regions of all the pixel regions. A second liquid crystal layer thickness adjusting film for adjusting the layer thickness of the liquid crystal layer in the non-colored light emitting region, wherein the liquid crystal layer thickness in the non-colored light emitting region is adjusted so that the light transmittance is substantially maximized. It is desirable to set.

With this configuration, non-colored light of higher luminance is emitted from the non-colored light emission region of each pixel region, and the banding of the non-colored light due to the wavelength dependence of transmittance is substantially eliminated. The display brightness and color quality can be further improved.

Further, in the case where the three color films are formed in areas smaller than the area of the pixel region, respectively,
The film thickness and area of the color coloring film are the
The color coordinates of the colored light transmitted through the colored film of the second color, the color coordinates of the colored light transmitted through the second colored film, and the color coordinates of the colored light transmitted through the third colored film are connected. It is desirable that the area of the color range surrounded by the triangle be substantially maximal and the chroma (C *) of the mixed light of the respective colored lights be set to a value that is substantially minimized. By setting the thickness and area, the color balance of the colored light of each color transmitted through these colored films is improved, and the color balance is further adjusted by the wavelength dependence of the transmittance corresponding to the liquid crystal layer thickness of each region described above. As a result, a color image with sufficient brightness can be displayed with good color quality.

For example, the three colored films are red, green,
In the case of a blue color filter, the thickness tR of the red filter, the thickness tG of the green filter, and the thickness tB of the blue filter are set in a relationship of tG <tR <tB,
The area sR of the red filter, the area sG of the green filter, and the area sB of the blue filter are represented by sR> s.
B> sG may be set. If the film thickness and the area of the color filter of each color are set in this manner, the area of the color range on the color system is increased, and the red light and the green light Chroma (C *) of mixed light with blue light can be reduced.

In the liquid crystal display device of the present invention, the three color films are thin, high transmittance color films, and each of these color films has an area corresponding to almost the entire area of the pixel region. The liquid crystal layer thickness adjusting film may be formed so as to correspond to almost the entire coloring film. In this case, the liquid crystal layers in the regions corresponding to the coloring film in each pixel region are respectively described above. By setting as described above, the color balance of the three colored lights, which are the light emitted from the colored film corresponding areas of each pixel area, is improved, and the white band displayed by the mixed color of these colored lights is improved. A color image with good color quality can be displayed with almost no loss.

Further, according to the present invention, a transmissive liquid crystal display element for displaying by utilizing light from a backlight is also provided with a reflection means on the back side, and displays by utilizing external light such as natural light or indoor light. The present invention can be applied to a reflective liquid crystal display element, and even a reflective liquid crystal display element can display a color image with good color quality.

[0019]

1 to 3 show a first embodiment of the present invention. FIG. 1 is a sectional view of a part of a liquid crystal display device, and FIG. 2 shows a spectral distribution characteristic of light emitted from the liquid crystal display device. FIG. 3 is a diagram showing the color coordinates of red, green, and blue colored light in the CIE1976L * a * b * color system, the color range surrounded by a triangle connecting them, and the color coordinate of mixed light. .

The liquid crystal display device of this embodiment is an active matrix type TN (twisted nematic).
Type liquid crystal display element, as shown in FIG. 1, a pair of transparent substrates (for example, a glass substrate) opposed to each other with a liquid crystal layer 10 interposed therebetween.
A plurality of transparent pixel electrodes 3 arranged in a matrix and a plurality of active elements respectively connected to the pixel electrodes 3 are arranged on one of the substrates 1 and 2, for example, the inner surface of the rear substrate 2. And a signal supply wiring (not shown) for supplying a signal to the active element. The other substrate, for example, an inner surface of the front substrate 1
A single film-shaped transparent counter electrode 4 that forms a pixel area A by a portion facing the plurality of pixel electrodes 3 is provided.

The pair of substrates 1 and 2 are joined at their peripheral edges via a frame-shaped sealing material (not shown), and the liquid crystal layer 10 is surrounded by the sealing material between the substrates 1 and 2. A nematic liquid crystal is sealed in the region indicated by the arrow.

Although not shown in the figure, the active element is, for example, a TFT (thin film transistor).
The FT includes a gate electrode formed on the surface of the rear substrate 2, a gate insulating film covering the gate electrode, an i-type semiconductor film formed on the gate insulating film so as to face the gate electrode, and It comprises a source electrode and a drain electrode formed on both sides of the i-type semiconductor film via the n-type semiconductor film. The gate insulating film (transparent film)
It is formed over almost the entire surface of the rear substrate 2.

The signal supply wiring is a gate signal supply wiring and a data signal supply wiring for supplying a gate signal and a data signal to the TFT, and the gate signal supply wiring is provided on the rear side substrate 1 surface. And is covered with the gate insulating film except for its terminal portion. Further, the data signal supply wiring is formed on the gate insulating film and is connected to a drain electrode of the TFT.

The pixel electrode 3 is formed on the gate insulating film.
The source electrode of T is connected. An alignment film 5 is provided on the inner surface of the rear substrate 2 so as to cover the arrangement region of the pixel electrodes 3.

On the other hand, on the inner surface of the front substrate 1, a light-shielding film (black mask) 6 corresponding to a region between the pixel regions (regions in which the pixel electrodes 3 and the counter electrode 4 face each other) A is formed. In addition, three color films having different transmission wavelength bands from each other, for example, three color filters 7R, 7G, 7B of red, green, and blue are provided corresponding to the respective pixel regions A.

These color filters 7R, 7G, 7B
Are formed in an area smaller than the area of the pixel region A, and the thicknesses and areas of the color filters 7R, 7G, 7B of red, green, and blue are respectively CIE1976L shown in FIG. A * b in the * a * b * color system
* The color coordinates RC of the red light transmitted through the red filter 7R and the color coordinates G of the green light transmitted through the green filter 7G on the surface.
C and the color coordinates BC of the blue light transmitted through the blue filter 7B.
Is set to a value at which the area of the color range surrounded by the triangle connecting the two is substantially maximal, and the chroma (C *) of the mixed light of the red light, the green light, and the blue light indicated by the color coordinates WC is substantially minimized. Have been.

That is, the red, green and blue color filters 7
Of the R, 7G, and 7B, the thickness of the red filter 7R that transmits light in the long wavelength band is tR, the area is sR, and the thickness of the green filter 7G that transmits light in the intermediate wavelength band is t.
G, the area is sG, the thickness of the blue filter 7B through which light in the short wavelength band is transmitted is tB, and the area is sB. In this embodiment, the relationship of tG <tR <tB is set, and sR> By setting the relationship of sB> sG, the color coordinates RC, G of light of each color of red, green, and blue in the color system are set.
The area of the color range surrounded by the triangle connecting the points C and BC is increased, and the chroma (C *) of the mixed light (white light) of the red, green, and blue lights in the color system is used. ) Is smaller.

The area of the color range on the a * b * plane in the color system is preferably 750 or more.
Chroma (C *) of the mixed light (C of a * = 0, b * = 0)
The distance from the light source) is desirably a value of 1.5 or less.

The red, green and blue color filters 7R, 7
The film thickness and area of G and 7B will be specifically described. In this embodiment, the film thickness tR of the red filter 7R, the film thickness tG of the green filter 7G, and the film thickness tB of the blue filter 7B.
And the red filter thickness tR = 0.9 to 1.2 μm, the green filter thickness tG = 0.8 to 1.1 μm, the blue filter thickness tB = 1.1 to 1.4 μm, and the area sR of the red filter 7R. And green filter 7
Assuming that the area sG of G and the area sB of the blue filter 7B are 100% of the area of the pixel region A, the red filter area sR = 90 to 95%, the green filter area sG = 60 to 65%, and the blue filter area sB. = 75-80%.

As described above, each of the red, green, and blue color filters 7R, 7G, and 7B is formed to have an area smaller than the area of the pixel area A. Therefore, the color filters 7R in each pixel area A are formed. , 7G, and 7B (hereinafter, referred to as filter corresponding areas) are the emission areas of the colored light, and the color filters 7 in each pixel area A
A region b not corresponding to R, 7G, and 7B is a non-colored light emitting region in which light incident on the front surface of the liquid crystal display element, reflected by a reflection unit described later, and emitted to the front surface of the liquid crystal display element is transmitted without coloring. It has become.

In this embodiment, the color filters 7R, 7G, 7B of the respective colors are provided in correspondence with the inner regions except for the peripheral portion of the pixel region A. Is a non-colored light emission area b over the entire circumference.

Further, on the inner surface of the front substrate 1, a green filter 7G through which light in the middle wavelength band of the color filters 7R, 7G and 7B passes, and a blue filter 7B through which light in the short wavelength band passes. And a liquid crystal layer thickness adjusting film 8 for adjusting the layer thickness of the liquid crystal layer 10 in the filter corresponding area a corresponding to the color filters 7G and 7B, and the non-coloring of all the pixel areas A is provided. A second liquid crystal layer thickness adjusting film 8a for adjusting the layer thickness of the liquid crystal layer 10 in the non-colored light emitting region b is provided corresponding to the light emitting region b.

Each of the liquid crystal layer thickness adjusting films 8 and 8a has almost no wavelength dependence and a transmittance of almost 100%.
The liquid crystal layer thickness adjustment film 8 corresponding to the green filter 7G and the blue filter 7B is formed over the entire surface of the color filters 7G and 7B, The second liquid crystal layer thickness adjusting film 8a corresponding to the colored light emission region b is provided on the entire surface of the front substrate 1 in the entire non-colored light emission region b of all the pixel regions A and the region between the adjacent pixel regions A. It is formed corresponding to.

Preferably, the liquid crystal layer thickness adjusting films 8 and 8a are formed using a colorless photocurable resin containing no pigment. , 8a can be formed using the process of forming the color filters 7R, 7G, 7B.

That is, as is generally known, the red, green, and blue color filters 7R, 7G, and 7B are coated with a photo-curable resin in which a pigment is dispersed on the substrate 1, and are formed by photolithography. The liquid crystal layer thickness adjusting films 8 and 8a are formed by patterning. If the colorless photocurable resin containing no pigment is used as the material of the liquid crystal layer thickness adjusting films 8 and 8a, the liquid crystal layer thickness adjusting films 8 and 8a are also formed by the color filter 7R. , 7
G and 7B can be formed using the forming process.

The color filters 7R, 7G, 7B and the liquid crystal layer thickness adjusting films 8, 8a are formed by sequentially forming red, green, and blue color filters 7R, 7G, 7B, and then the liquid crystal on the green filter 7G. Layer thickness adjusting film 8 and blue filter 7B
The upper liquid crystal layer thickness adjusting film 8 and the second liquid crystal layer thickness adjusting film 8a corresponding to the non-colored light emitting region b may be formed sequentially, and all the color filters 7R,
A total of six patterning steps are required to form the layers 7G and 7B and the liquid crystal layer thickness adjusting films 8 and 8a.

The green filter 7G and the liquid crystal layer thickness adjusting film 8 on the green filter 7G and the blue filter 7B and the liquid crystal layer thickness adjusting film 8 formed on the blue filter 7B are made of a photo-curable resin in which a pigment is dispersed. And a colorless photo-curing resin may be applied by overlapping and patterning both at the same time. According to this method, the patterning of the red filter 7R, the green filter 7G and the liquid crystal layer thereon The patterning of the thickness adjusting film 8, the patterning of the blue filter 7B and the liquid crystal layer thickness adjusting film 8 thereon, and the patterning of the second liquid crystal layer thickness adjusting film 8a corresponding to the non-colored light emission area b are performed four times in total. All the color filters 7R, 7G, 7B and the liquid crystal layer thickness adjusting films 8, 8
a can be formed.

The counter electrode 4 includes a red filter 7R,
The liquid crystal layer thickness adjusting film 8 formed on the green filter 7G and the blue filter 7B, and the second liquid crystal layer thickness adjusting film 8 corresponding to the non-colored light emission region b of all the pixel regions A.
a, these regions are formed over the entire region, and an alignment film 9 is provided thereon.

The alignment films 9 and 5 provided on the inner surfaces of the pair of substrates 1 and 2 are respectively subjected to an alignment process by rubbing the film surfaces in a predetermined direction.
The alignment direction of the liquid crystal molecules of the liquid crystal layer 10 between the two substrates 1 and 2 is regulated in the vicinity of the respective substrates 1 and 2 by the alignment film 9 of the front substrate 1 and the alignment film 5 of the rear substrate 2. A predetermined twist angle between the substrates 1 and 2 (for example, approximately 9
0 °).

Further, polarizing plates 11 and 12 are disposed on the outer surfaces of the pair of 1 and 2, respectively, and the light enters the liquid crystal display element from the front side on the back side of the polarizing plate 12 on the back side. As a reflection means for reflecting the light transmitted through the liquid crystal layer 10, a scattering reflector 13 is provided.

The liquid crystal display element of this embodiment is in a state where no electric field is applied to the liquid crystal layer 10 (the liquid crystal molecules are oriented in the initial twisted state where the liquid crystal molecules are most inclined with respect to the substrates 1 and 2). (State) is the highest, and the transmittance of light decreases as liquid crystal molecules rise and align with respect to the substrates 1 and 2 when an electric field is applied to the liquid crystal layer 10. The white mode is displayed. For example, the twist angle of liquid crystal molecules is approximately 9
When the angle is 0 °, the polarizing plates 11 and 12 are provided with their transmission axes substantially orthogonal to each other.

In this embodiment, the thicknesses of the liquid crystal layer thickness adjusting films 8 provided corresponding to the green filter 7G and the blue filter 7B are respectively set to red, green, and blue color filters 7R, 7G, and 7G. 7B, the liquid crystal layer thickness dR of the region corresponding to the red filter 7R in the filter corresponding region a of each pixel region A is selected.
And a liquid crystal layer thickness dG in a region corresponding to the green filter 7G.
And a liquid crystal layer thickness dB in a region corresponding to the blue filter 7B are incident on each of these regions, and the color filters 7R,
7G and 7B are transmitted so as to be colored into the color of the color filter, and are transmitted through the liquid crystal layer 10 and set so that the color displayed by the additive color mixing of the colored light emitted from each region becomes white. I have.

Further, in this embodiment, in order to obtain a brighter display, a red filter 7 through which light in a long wavelength band is transmitted.
The liquid crystal layer thickness dR in the region corresponding to R is set so that light in the long wavelength band (light in the red wavelength band) in the visible light band has a higher transmittance, and light in the middle wavelength band is The liquid crystal layer thickness dG in the region corresponding to the green filter 7G to be transmitted is set such that the light in the middle wavelength band (light in the green wavelength band) in the visible light band has a higher transmittance, and the short wavelength The liquid crystal layer thickness dB in a region corresponding to the blue filter 7B through which light in the band is transmitted is set such that light in the short wavelength band (light in the blue wavelength band) in the visible light band has a higher transmittance. And the thickness d of the liquid crystal layer in the uncolored light emitting area b.
W is set such that the light transmittance is substantially maximized.

The liquid crystal layer thickness dR, dG, d in each of these regions
B and dW will be described. The transmittance T of the TN type liquid crystal display element is expressed by the following equation (1), where Δnd is the product of the refractive index anisotropy Δn of the liquid crystal and the liquid crystal layer thickness d.

T = 1− {sin ² [θ (1 + u ² ) ^1/2 ]} / (1 + u ² ) (1) u = (Δnd / λ) · (π / θ) θ = π / 2 λ: Wavelength Δn: Refractive index anisotropy of liquid crystal d: Liquid crystal layer thickness In the reflection type display of the liquid crystal display device, light is incident on the liquid crystal display device from a direction perpendicular to the front surface, and the reflected light is emitted in the vertical direction. In simple terms, the wavelength dependence of the transmittance in the case of the reflective display can be obtained by calculating the above equation (1) by the square.

As shown by the equation (1), the transmittance T of the liquid crystal display element changes depending on the wavelength, and Δnd
It changes depending on the value of. Therefore, the transmittance T of the liquid crystal display element has wavelength dependency, and the value of Δnd of the liquid crystal layer is adjusted by the liquid crystal layer thickness adjusting film 8 in order to cancel the wavelength dependency of the transmittance.

The transmittance of the reflection type liquid crystal display element is determined by the above (1).
When calculated by the square of the expression, for example, the refractive index anisotropy Δn
In the case of using a liquid crystal of 0.09, when d = 5.8 μm,
Light in the long wavelength band (light in the red wavelength band) shows higher transmittance, and at d = 4.8 μm, light in the middle wavelength band (light in the green wavelength band) shows higher transmittance, and The wavelength dependency at which the transmittance (total transmittance of light in the visible light band) is maximized is obtained. At d = 3.8 μm, light in the short wavelength band (light in the blue wavelength band) has a higher transmittance. The wavelength dependence shown is obtained.

Therefore, for example, the refractive index anisotropy Δ of the liquid crystal
n is 0.09, and red, green, and blue color filters 7R, 7
The thicknesses tR, tG, and tB of G and 7B are tR = 1.05 μm.
When m and tG = 1.00 μm and tB = 1.30 μm, the liquid crystal layer thickness adjusting film 8 on the green filter 7G, the liquid crystal layer thickness adjusting film 8 on the blue filter 7B, and the non-colored light emitting region b1 and t2 = 1.05 μm, t2 = 1.75 μm, and t3 =
A pair of substrates 1 and 2 is formed to a thickness of 2.05 μm.
Are bonded via a frame-shaped sealing material having a thickness of about 6.85 μm so that the liquid crystal layer thickness in a region corresponding to the red filter 7R without the liquid crystal layer thickness adjusting film 8 becomes 5.8 μm. With this configuration, red, green, and blue color filters 7R, 7G, 7
The liquid crystal layer thickness dR, dG, dB of each region corresponding to B and the liquid crystal layer thickness dW of the non-colored light emitting region b are determined by the liquid crystal layer thickness (dR = 5.8 μm, d
G = dW = 4.8 μm, dB = 3.8 μm).

This liquid crystal display element performs a reflection type display using external light such as natural light or indoor light. Light incident from the front surface of the liquid crystal display device is polarized along its absorption axis by a polarizing plate 11 on the front surface side. The light of the polarized component is absorbed, becomes linearly polarized light of the polarized component along the transmission axis, enters the liquid crystal layer 10, and is rotated by the birefringence in the process of transmitting the liquid crystal layer 10 through the transmission. .

The light transmitted through the liquid crystal layer 10 is incident on the rear-side polarizing plate 12, and of the light, light having a polarization component along the transmission axis of the rear-side polarizing plate 12 is transmitted through the polarizing plate 12. The transmitted image light is transmitted to the scattering reflector 13.
, And sequentially pass through the rear-side polarizing plate 12, the liquid crystal layer 10, and the front-side polarizing plate 11, and are emitted to the front.

At this time, of the light incident on each pixel area A from the front, the light transmitted through the filter corresponding area a of the pixel area A is the red, green and blue color filters 7R, 7G, 7B absorbs the light in the absorption wavelength band and colors the color of the color filter, and the colored light is reflected and emitted to the front surface of the element. The intensity of the colored emitted light changes according to the rising alignment state of the liquid crystal molecules according to the electric field applied between the electrodes 3 and 4.

In the light incident on each pixel area A,
The light that has entered the non-colored light emission area b at the periphery of the pixel area A is reflected as non-colored light without passing through the color filters 7R, 7G, and 7B, and is emitted to the front surface of the element. The intensity of the uncolored outgoing light also changes according to the rising alignment state of the liquid crystal molecules according to the electric field applied between the electrodes 3 and 4.

That is, in this liquid crystal display device, in all the pixel regions A, of the light incident from the front surface of the liquid crystal display device, reflected by the scattering reflector 13 on the rear surface side, and emitted to the front surface, the filter corresponding region a Only the light transmitted through the color filter 7R, 7G, 7B is colored in the color of the color filters 7R, 7G, 7B, and the light transmitted through the non-colored light emission area b is transmitted without being absorbed by the color filter. The red, green, and blue color pixels are displayed by the colored light that is the outgoing light and the non-colored light that is the outgoing light from the uncolored light emitting area b.

The color pixels appear to the human eye as if the entire pixel is colored in the color of the colored light, and a full-color image is displayed by additive color mixing of these red, green and blue color pixels. You. Note that the color pixels are high-luminance pixels in which the color of the colored light is slightly lightened, and the color density and brightness correspond to the light amount ratio between the colored light and the non-colored light.

Therefore, the above-mentioned liquid crystal display element is of a reflection type in which display is performed using external light.
Thus, a high-luminance color pixel can be displayed, and a full-color image with sufficient brightness can be displayed.

In this liquid crystal display element, as described above, the thickness tR of the red filter 7R, the thickness tG of the green filter 7G, and the thickness tB of the blue filter 7B.
Are set in a relation of tG <tR <tB, and the area sR of the red filter, the area sG of the green filter, and the area sB of the blue filter are set in a relation of sR>sB> sG. By providing a liquid crystal layer thickness adjusting film 8 having a predetermined thickness in a region corresponding to the green filter 7G and the blue filter 7B in the filter corresponding region a of the pixel region A, the filter corresponding region a of each pixel region A is provided. Of the liquid crystal layer thickness dR in the region corresponding to the red filter 7R,
A liquid crystal layer thickness dG in a region corresponding to the green filter 7G and a liquid crystal layer thickness dB in a region corresponding to the blue filter 7B are incident on these regions, and the color filters 7R, 7G,
7B, the color of the color filter is colored and the liquid crystal layer 10 is set so that the color displayed by the additive color mixing of the colored lights emitted from the respective regions through the liquid crystal layer 10 becomes white. , Filter corresponding area a of each pixel area
The color balance of red, green, and blue colored light, which is the light emitted from, is improved, and the white band displayed by the mixture of the colored lights of these colors is almost eliminated, thereby providing a full-color image of good color quality. Can be displayed.

That is, this liquid crystal display device has red, green,
Each of the color filters 7R, 7G, 7B is incident on each area a corresponding to each of the blue color filters 7R, 7G, 7B.
B, the color of the red, green, and blue colored light emitted from the respective regions a through the liquid crystal layer 10 while being transmitted through the liquid crystal layer 10 is determined by the liquid crystal layer thickness dR, dG of each of these regions a. , D
The liquid crystal layer thickness dR of each region a corresponding to the red, green, and blue color filters 7R, 7G, and 7B, respectively, is adjusted as described above. , DG, and dB are incident on these areas a, pass through the color filters 7R, 7G, and 7B and are colored into the colors of the color filters, and pass through the liquid crystal layer 10 and exit from the respective areas. If the color displayed by the additive color mixture of colored light is set to be white, red,
It is possible to almost eliminate the white band color displayed by the mixture of the green and blue colored lights, and to display a color image with good color quality.

Further, in the above-mentioned liquid crystal display element, a second liquid crystal layer thickness adjusting film 8a having a predetermined thickness is provided in a region corresponding to the non-colored light emitting region b of each pixel region A, so that the non-colored light is adjusted. Since the liquid crystal layer thickness dW of the emission region b is set so that the light transmittance is substantially maximized, the non-colored light of higher luminance is emitted from the uncolored light emission region b of each pixel region A. In addition, the banding of the uncolored light due to the wavelength dependence of the transmittance is almost eliminated, and the brightness and color quality of the display can be further improved.

In the above liquid crystal display device, the thicknesses and areas of the red, green and blue color filters 7R, 7G and 7B are respectively set to CIE1976L * a * b * shown in FIG.
The color coordinate RC of red light transmitted through the red filter 7R, the color coordinate GC of green light transmitted through the green filter 7G, and the color of blue light transmitted through the blue filter 7B on the a * b * plane in the color system. A value in which the area of a color range surrounded by a triangle connecting the coordinates BC is substantially maximal, and the chroma (C *) of the mixed light of the red light, the green light, and the blue light indicated by the color coordinates WC is substantially minimal. , The color balance of the red, green, and blue colored light transmitted through these color filters 7R, 7G, and 7B is improved, and the color balance is adjusted to the liquid crystal layer thickness dR of each filter corresponding region a. , DG, and dB, it is possible to display a color image with sufficient color quality and sufficient brightness by further adjusting the wavelength dependence of the transmittance.

That is, the chroma (C) of each color of red, green and blue
*) Is indicated by the distance from each vertex of the triangle indicating the color area in the CIE1976L * a * b * color system shown in FIG. 3 to the origin of the color coordinates, and as described above, the thickness tR of the red filter. And the thickness tG of the green filter and the thickness tB of the blue filter are set to satisfy the relationship of tG <tR <tB, and the area sR of the red filter, the area sG of the green filter, and the The area sB and sR
If the relationship>sB> sG is set, the area of the color range on the color system can be increased, and the chroma (C *) of the mixed light of red, green, and blue light can be reduced. it can.

For example, as in the above embodiment, the thickness tR of the red filter 7R is 0.9 to 1.2 μm, the thickness tG of the green filter 7G is 0.8 to 1.1 μm, and the thickness of the blue filter 7B is The thickness tB is set to 1.1 to 1.4 μm, and the area sR of the red filter 7R is set to 9 times the area of the pixel region A.
0 to 95%, the area sG of the green filter 7G is set to the pixel area A.
Is set to 60 to 65% of the area of the pixel region A, and the area sB of the blue filter 7B is set to 75 to 80% of the area of the pixel region A.
The area of the color range in the IE1976L * a * b * color system is almost maximized, the chroma (C *) of the mixed light of the red light, the green light and the blue light is almost minimized, and the transmittance is high. Can be obtained.

FIG. 2 shows red, green and blue color filters 7.
R, 7G, 7B film thickness tR, tG, tB and area sR, s
The graph shows the spectral distribution characteristics of the emitted light of the liquid crystal display element when G and sB are set to the values in the above ranges, respectively. In the drawing, R, G, and B indicate the output from the filter corresponding area of each pixel area A. The spectral distribution of red, green, and blue colored light that is emitted light is shown, and W represents the spectral distribution of non-colored light that is emitted from the uncolored light emission area b.

As shown in FIG. 2, the liquid crystal display in which the thicknesses tR, tG, tB and the areas sR, sG, sB of the red, green, and blue color filters 7R, 7G, 7B are set to values within the above ranges, respectively. In the element, the red, green, and blue colored lights R, G, and B from each pixel area A are lights having good color purity and well-balanced transmittances, and the mixed light is transmitted. Good white light with a high rate and little color.

That is, the liquid crystal display element has a red light color coordinate RC, a green light color coordinate GC, and a blue light color coordinate BC on the CIE1976L * a * b * color system shown in FIG. The area of the color range surrounded by the triangle connecting is almost maximal (750 or more), and the chroma (C *) of the mixed light
Is very close to the C light source with a * = 0 and b * = 0 (C * =
1.5 or less).

Therefore, according to the above liquid crystal display device,
It is possible to improve the light transmittance and make the screen sufficiently bright without deteriorating the chroma (C *) and color balance of each color of red, green, and blue, thereby displaying a full-color image with good image quality. can do.

As described above, in the liquid crystal display element, the areas of the red, green, and blue color filters 7R, 7G, and 7B corresponding to the respective pixel areas A are made smaller than the area of the pixel area A. Color filters 7R, 7
G, 7B thickness tR, tG, tB and area sR, sG, s
By setting B and B as described above, the brightness and color balance of the display are improved, and in addition, the regions corresponding to the green filter 7G and the blue filter 7B in the filter corresponding region a of each pixel region A And the liquid crystal layer thickness adjusting films 8 and 8a in the non-colored light emitting regions b which do not correspond to the color filters 7R, 7G and 7B of all the pixel regions A, respectively.
And red, green, and blue color filters 7R, 7G, and 7B.
The brightness and color balance are further improved by setting the liquid crystal layer thickness dR, dG, dB of each region corresponding to the above and the liquid crystal layer thickness dW of the uncolored light emitting region b as described above. According to this liquid crystal display device, a color image of good color quality with sufficient brightness, almost no white band displayed by mixing red, green, and blue colored light is displayed. be able to.

In the above embodiment, the areas of the red, green and blue color filters 7R, 7G and 7B corresponding to the respective pixel areas A are made smaller than the area of the pixel area A in order to brighten the display. However, if the thickness of the red, green and blue color filters 7R, 7G and 7B is reduced and the transmittance of the color filters 7R, 7G and 7B is increased, the color filters 7R, 7G and 7B can be Even if the display area is formed to have an area corresponding to the entire area A, the display can be made bright.

FIG. 4 is a cross-sectional view of a part of a liquid crystal display device according to a second embodiment of the present invention. The liquid crystal display device of this embodiment has red, green, and blue colors corresponding to pixel regions A, respectively. Each of the color filters 7R, 7G, and 7B is a thin film filter having a high transmittance.
G and 7B are formed in areas corresponding to almost the entire area of the pixel region A, respectively.

In this embodiment, among the color filters 7R, 7G and 7B, a green filter 7G through which light in the middle wavelength band passes and a blue filter 7B through which light in the short wavelength band passes are provided. These color filters 7G,
7B, corresponding to almost the entire pixel area A, the transmittance is almost 100% with almost no wavelength dependency.
Liquid crystal layer thickness adjustment film 8 made of extremely high colorless transparent resin
Is provided.

Each of the liquid crystal layer thickness adjusting films 8 is formed to have a predetermined film thickness.
The liquid crystal layer thickness dR of the pixel region A corresponding to R, the liquid crystal layer thickness dG of the pixel region A corresponding to the green filter 7G, and the liquid crystal layer thickness dB of the pixel region A corresponding to the blue filter 7B are:
The light enters each of the pixel areas A, and the color filter 7
R, 7G, and 7B, and is colored to the color of the color filter.
Are set such that the color displayed by the additive color mixture of the colored lights emitted from the respective colors becomes white.

The liquid crystal layer thickness dR of the pixel area A corresponding to the red filter 7R, the liquid crystal layer thickness dG of the pixel area A corresponding to the green filter 7G, and the liquid crystal layer thickness dB of the pixel area A corresponding to the blue filter 7B. Respectively correspond to the first
It is sufficient to set the same conditions as in the embodiment.

That is, for example, the refractive index anisotropy Δ of the liquid crystal
When n is 0.09, the liquid crystal layer thickness adjusting film 8 on the green filter 7G and the liquid crystal layer thickness adjusting film 8 on the blue filter 7B are t1 = 1.05 μm and t2 = 1.75, respectively.
The pair of substrates 1 and 2 are formed through a frame-shaped sealing material so that the liquid crystal layer thickness in the region corresponding to the red filter 7R without the liquid crystal layer thickness adjusting film 8 becomes 5.8 μm. The liquid crystal layer thickness dR, dG, dB of each pixel area A corresponding to the red, green, blue color filters 7R, 7G, 7B is joined by dR = 5.8 μm dG = 4.8 μm dB = 3.8 μm , The transmittance of each color can be increased.

The liquid crystal display device of this embodiment has red,
The green and blue color filters 7R, 7G, and 7B are thin film filters with high transmittance, and these color filters 7R, 7R
G and 7B are respectively formed in areas corresponding to almost the entire area of the pixel area A, and the liquid crystal layer thickness adjusting films 8 corresponding to the green filters 7G and the blue filters 7B are provided so as to correspond to almost the entire area of the pixel area A. Although there is no emission region of non-colored light in the pixel region A, the other configuration is the same as that of the first embodiment described above.

According to the liquid crystal display device of this embodiment, red,
Since the thicknesses of the green and blue color filters 7R, 7G, and 7B are reduced and the transmittance of the color filters 7R, 7G, and 7B is increased, the color filters 7R, 7G, and 7B are increased.
7B having an area corresponding to the entire area of the pixel area A,
The display can be made bright, so that even a reflection type display using external light can display a full-color image with sufficient brightness.

In this embodiment, red, green,
The liquid crystal layer thicknesses dR, dG, and dB of the pixel regions A corresponding to the blue color filters 7R, 7G, and 7B are incident on these pixel regions A, transmitted through the color filters 7R, 7G, and 7B, and subjected to color conversion. Since the color displayed by the additive color mixing of the colored lights emitted from the respective pixel regions A through the liquid crystal layer 10 while being colored with the filter is set so as to be white, each pixel region A The color balance of the red, green, and blue colored lights, which are the light emitted from the color light, is improved, and the white band displayed by the mixture of the colored lights of these colors is almost eliminated, so that a color image of good color quality can be obtained. Can be displayed.

In the first and second embodiments,
The liquid crystal layer adjustment film 8 is not provided in a region corresponding to the red filter 7R through which light in a long wavelength band passes, but the liquid crystal layer adjustment film 8 is provided in a region corresponding to all of the red, green, and blue color filters 7R, 7G, and 7B. By providing a layer adjustment film 8 and selecting the film thickness of these liquid crystal layer adjustment films 8 respectively, red, green,
The liquid crystal layer thicknesses dR, dG, and dB of each pixel region A corresponding to the blue color filters 7R, 7G, and 7B are determined by adding colors of red, green, and blue colored light emitted from each pixel region A to the color displayed. May be set to be white.

In each of the above embodiments, a color filter is used as a colored film. However, the colored film is not limited to a color filter.
The color filters 7R, 7G, and 7B may be provided on the inner surface of the substrate 2 opposite to the substrate 1 on which the color filters 7R, 7G, and 7B are formed.

Further, the liquid crystal display device of each of the above embodiments is
Although a full-color image is displayed by additive color mixture of red, green, and blue light, the present invention provides magenta, yellow,
The present invention can also be applied to a liquid crystal display element that includes a cyan colored film (for example, a color filter) and displays a multicolor image, and in that case, any of the colored films At least a liquid crystal layer thickness adjustment film is provided corresponding to the colored film that transmits light in at least the middle wavelength band and the colored film that transmits light in the short wavelength band, and corresponds to the colored film that transmits light in the long wavelength band. The liquid crystal layer thickness in the region, the liquid crystal layer thickness in the region corresponding to the colored film transmitting light in the middle wavelength band, and the liquid crystal layer thickness in the region corresponding to the colored film transmitting light in the short wavelength band, It is incident on each area, passes through the colored film, is colored to the color of the colored film, and is transmitted through the liquid crystal layer so that the color displayed by the mixed color of the colored lights emitted from the respective areas becomes white. By setting, the color balance of the colored light of each color is improved. Eliminating most of the bands colored white displayed by color mixing of the colored light of each of these colors, it is possible to display a color image of good color quality.

Further, the present invention is not limited to the active matrix system, and a plurality of scanning electrodes extending in one direction are provided on the inner surface of one substrate in parallel with each other, and a direction intersecting with the scanning electrodes is provided on the inner surface of the other substrate. The present invention can also be applied to a simple matrix type liquid crystal display device or the like in which a plurality of signal electrodes are provided in parallel with each other.

The liquid crystal display device of each of the above embodiments has polarizing plates 11 and 12 disposed on the front side and the back side, respectively, and a reflecting plate 13 disposed on the back side of the polarizing plate 12 on the back side. Alternatively, for example, an electrode (the pixel electrode 3 in the above-described embodiment) provided on the inner surface of the rear substrate 2 may be formed of a metal film, and this electrode may constitute the reflection means. Need only be the front side polarizing plate 11.

Further, when the front polarizing plate 11 and the rear polarizing plate 12 are provided as in the above embodiment, the reflecting plate 13 disposed behind the back polarizing plate 12 is a semi-transmissive reflecting plate, and A backlight may be arranged on the display, so that both a reflective display using external light and a transmissive display using light from the backlight can be performed.

The present invention can also be applied to a transmissive liquid crystal display element that performs only display using light from a backlight. In that case, a colored film such as a color filter is used. Even if the thickness is somewhat large and these colored films correspond to almost the entire pixel area, the display can be brightened by increasing the luminance of the backlight.

[0083]

According to the liquid crystal display device of the present invention, at least the middle wavelength band of the three color films through which light in the long wavelength band, the middle wavelength band, and the short wavelength band is transmitted is formed on the inner surface of any one of the substrates. A liquid crystal layer thickness adjusting film is provided corresponding to the colored film that transmits the light of the short wavelength band and the colored film that transmits the light of the short wavelength band, and the thickness of the liquid crystal layer in the region corresponding to the colored film that transmits the light of the long wavelength band The liquid crystal layer thickness in a region corresponding to the colored film through which light in the middle wavelength band is transmitted and the liquid crystal layer thickness in a region corresponding to the colored film through which light in the short wavelength band is transmitted are incident on each of these regions. Since the transmittance of the colored light of each color transmitted through the colored film and colored from the respective regions through the liquid crystal layer while being colored by the color of the colored film is adjusted, the colored films of the three colors are adjusted. The color bars of the three colored lights that are the emitted lights from the respective areas corresponding to To improve the Nsu, by eliminating most of the bands colored white displayed by color mixing of the colored light of each of these colors, it is possible to display a color image of good color quality.

In the liquid crystal display device of the present invention, the liquid crystal layer thickness in a region corresponding to the colored film through which the light in the long wavelength band is transmitted and the liquid crystal in the region corresponding to the colored film through which the light in the middle and long wavelength band is transmitted. The layer thickness and the liquid crystal layer thickness of the region corresponding to the colored film through which the light in the short wavelength band is transmitted are set so that the transmittance of light in each wavelength band transmitted through each colored film is maximized. By doing so, the color balance of the three colored lights is good, and a color image of good color quality with almost no white band displayed by the mixture of the colored lights of these colors is displayed. Can be brightened.

Further, if the colored films of the three colors are formed in areas smaller than the area of the pixel region, and a region of the pixel region which does not correspond to the colored film is set as a non-colored light emission region, the pixel region can be transmitted. Only the light that passes through the region corresponding to the colored film out of the light to be absorbed is colored by the colored film by absorbing light having a wavelength outside the transmission wavelength band, and the light that passes through the non-colored light emitting region is absorbed by the colored film. Penetrating without receiving
Colored light that is emitted from the region corresponding to the colored film and high-luminance non-colored light that is emitted from the uncolored light emission region are used to display high-luminance color pixels. A color image with brightness can be displayed.

When the three colored films are formed in areas smaller than the areas of the pixel regions as described above, the inner surface of any one of the substrates is made to correspond to the non-colored light emitting regions of all the pixel regions. A second liquid crystal layer thickness adjusting film for adjusting the thickness of the liquid crystal layer in the non-colored light emitting region is provided, and the liquid crystal layer thickness in the non-colored light emitting region is set so that the light transmittance is substantially maximized. By doing so, while emitting non-colored light of higher luminance from the non-colored light emission region of each pixel region,
The band color of the uncolored light due to the wavelength dependence of the transmittance is almost eliminated, and the brightness and color quality of the display can be further improved.

In the case where the three color films are formed in areas smaller than the area of the pixel region, the thickness and area of the three color films are respectively set to the first color on the color system. A triangle connecting the color coordinates of the colored light transmitted through the colored film, the color coordinates of the colored light transmitted through the second colored film, and the color coordinates of the colored light transmitted through the third colored film. If the area of the enclosed color range becomes substantially maximal and the chroma (C *) of the mixed light of the red light, the green light and the blue light is set to a substantially minimum value, each color transmitted through these colored films can be obtained. The color balance of the colored light is improved, and the color balance is further adjusted by the wavelength dependency of the transmittance corresponding to the liquid crystal layer thickness in each region described above, so that a color image with good color quality and sufficient brightness can be obtained. Can be displayed.

For example, if the three colored films are red, green,
In the case of a blue color filter, the thickness tR of the red filter, the thickness tG of the green filter, and the thickness tB of the blue filter are set in a relationship of tG <tR <tB,
The area sR of the red filter, the area sG of the green filter, and the area sB of the blue filter are represented by sR> s.
B> sG may be set. If the film thickness and the area of the color filter of each color are set in this manner, the area of the color range on the color system is increased, and the red light and the green light Chroma (C *) of mixed light with blue light can be reduced.

Further, in the liquid crystal display device of the present invention, the three colored films are thin colored and high transmittance colored films, and these colored films each have an area corresponding to almost the entire area of the pixel region. The liquid crystal layer thickness adjusting film may be formed so as to correspond to almost the entire coloring film. In this case, the liquid crystal layers in the regions corresponding to the coloring film in each pixel region are respectively described above. By setting as described above, the color balance of the three colored lights, which are the light emitted from the colored film corresponding areas of each pixel area, is improved, and the white band displayed by the mixed color of these colored lights is improved. A color image with good color quality can be displayed with almost no loss.

Further, according to the present invention, a transmissive liquid crystal display element for displaying by utilizing light from a backlight is also provided with a reflecting means on the back side, and displays by utilizing external light such as natural light or room light. The present invention can be applied to a reflective liquid crystal display element, and even a reflective liquid crystal display element can display a color image with good color quality.

[Brief description of the drawings]

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

FIG. 2 is a view showing a spectral distribution characteristic of light emitted from the liquid crystal display element.

FIG. 3. Red in CIE1976L * a * b * color system
The figure which shows the color coordinate of green and blue coloring light, the color range enclosed by the triangle which connects them, and the color coordinate of mixed light.

FIG. 4 is a cross-sectional view of a part of a liquid crystal display device according to a second embodiment of the present invention.

[Explanation of symbols]

 1, 2 ... substrate 3 ... pixel electrode 4 ... counter electrode 7R, 7G, 7B ... color filter dR, dG, dB ... liquid crystal layer thickness in filter corresponding region dW ... liquid crystal layer thickness in non-colored light emitting region 11, 12 ... polarization Plate 13: Reflector A: Pixel area a: Filter corresponding area b: Uncolored light emitting area

Claims (6)

[Claims] A plurality of first electrodes provided on an inner surface of one of a pair of substrates facing each other with a liquid crystal layer interposed therebetween;
At least one second electrode that forms a pixel region by a portion facing the plurality of first electrodes is provided on an inner surface of the other substrate, and an inner surface of one of the substrates corresponds to each of the pixel regions. And three color films through which light in the long wavelength band, the middle wavelength band, and the short wavelength band having different transmission wavelength bands are transmitted, and at least one of the color films on the inner surface of any of the substrates. A liquid crystal layer thickness adjusting film that adjusts the thickness of the liquid crystal layer in a region corresponding to the colored film that transmits light in the wavelength band and the colored film that transmits light in the short wavelength band, respectively, is provided. The liquid crystal layer thickness in the region corresponding to the colored film through which light in the long wavelength band is transmitted, the liquid crystal layer thickness in the region corresponding to the colored film through which light in the middle wavelength band is transmitted, and the light in the short wavelength band Compatible with colored film that transmits light The thickness of the liquid crystal layer in the region where the color light is incident on each of these regions, passes through the colored film and is colored to the color of the colored film, and passes through the liquid crystal layer and exits from each region. A liquid crystal display device wherein the color displayed by the color mixture is set to be white. 2. A liquid crystal layer thickness in a region corresponding to the colored film through which light in the long wavelength band is transmitted, a liquid crystal layer thickness in a region corresponding to the colored film through which light in the middle and long wavelength band is transmitted, and The liquid crystal layer thickness in a region corresponding to the colored film through which light in the wavelength band is transmitted is set so that the transmittance of light in the wavelength band transmitted through each colored film is maximized. Item 2. A liquid crystal display device according to item 1. 3. The color film of each of the three colors is formed in an area smaller than the area of the pixel region, and a region of the pixel region that does not correspond to the color film is a non-color light emission region. A second liquid crystal layer thickness adjusting film for adjusting the layer thickness of the liquid crystal layer in the non-colored light emission region corresponding to the non-colored light emission region in all the pixel regions is provided on the inner surface of any of the substrates. 3. The liquid crystal display device according to claim 1, wherein the thickness of the liquid crystal layer in the non-colored light emitting region is set so that light transmittance is substantially maximized. 4. The color coordinates of the colored light transmitted through the first colored film and the color coordinates of the second colored film on the color system, respectively. The area of the color range surrounded by a triangle connecting the color coordinates of the transmitted colored light and the color coordinates of the colored light transmitted through the third color film becomes substantially maximal, and the chroma of the mixed light of the respective colored lights is obtained. 4. The liquid crystal display device according to claim 3, wherein (C *) is set to a value that is substantially minimum. 5. The color filters of three colors are color filters of three colors of red, green and blue, and have a thickness tR of a red filter, a thickness tG of a green filter, and a thickness tB of a blue filter. Are in a relationship of tG <tR <tB, and the area sR of the red filter, the area sG of the green filter, and the area sB of the blue filter are in a relation of sR>sB> sG. The liquid crystal display device according to claim 4. 6. The liquid crystal display device according to claim 1, further comprising a light reflecting means on the back side.