JP3368823B2 - Liquid crystal display device - Google Patents

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 provided with colored films of three colors having different transmission wavelength bands.

[0002]

2. Description of the Related Art Liquid crystal display elements include various types such as an active matrix type and a simple matrix type. For example, an active matrix type liquid crystal display element includes a pair of substrates facing each other with a liquid crystal layer interposed therebetween. A plurality of pixel electrodes arranged in a matrix, a plurality of active elements respectively connected to these pixel electrodes, and a signal supply wiring for supplying a signal to the active elements are provided on the inner surface of one of the substrates. A counter electrode is provided on the inner surface of the other substrate to form a pixel region in each of the portions facing the plurality of pixel electrodes.

Liquid crystal display elements include those for displaying a black and white image and those for displaying a color image. The liquid crystal display element for displaying a multicolor image such as a full-color image is one of the substrates. On the inner surface of, the colored films of three colors having different transmission wavelength bands (for example, color filters of three colors of red, green, and blue) are provided corresponding to the respective pixel regions.

In the conventional liquid crystal display element, the colored films correspond to the three colored films so that the colored light colored in the color of the colored film is emitted from the entire area of each pixel region. In order to obtain a bright display by reducing the absorption of light in the colored film while forming an area corresponding to the entire area of the pixel region, each of the colored films of three colors has a thin colored film of transmittance. I am trying.

[0005]

However, in the conventional liquid crystal display device having the colored films, the color balance of the colored lights of the three colors, which are the lights emitted from the respective regions corresponding to the colored films of the three colors, is not achieved. Unfortunately, there is a problem in that the white display, which is displayed by mixing the colored lights of these colors, becomes tinged with 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 which is the light emitted from the area corresponding to the red filter,
The green light emitted from the area corresponding to the green filter and the blue light emitted from the area corresponding to the blue filter are displayed by an additive color mixture. , White displayed by mixing the colored lights of blue becomes greenish.

The present invention improves the color balance of the colored lights of the three colors, which are the lights emitted from the regions corresponding to the colored films of the three colors, respectively, and displays the white light displayed by mixing the colored lights of the respective colors. 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]

A liquid crystal display device according to the present invention is provided with a plurality of first electrodes on the inner surface of one of a pair of substrates facing each other across a liquid crystal layer, and the other substrate. At least one second electrode forming a pixel region by a portion facing the plurality of first electrodes is provided on an inner surface of the substrate, and an inner surface of any one of the substrates corresponds to each of the pixel regions . Than the area of the pixel area
A colored film of three colors, which is formed in a small area and transmits light of a long wavelength band, a medium wavelength band, and a short wavelength band having different transmission wavelength bands, is provided, and the coloring film is formed on an inner surface of any one of the substrates. Among them, the layer thickness of the liquid crystal layer in the region corresponding to these colored films is adjusted by respectively corresponding to the colored film that transmits at least the medium wavelength band and the colored film that transmits the short wavelength band. A first liquid crystal layer thickness adjusting film ,
Non-colored light emission that does not correspond to the colored film in each pixel area
Depending on the area, the layer thickness of the liquid crystal layer in the non-colored light emitting area
The second liquid crystal layer thickness adjusting layer for adjusting is provided a pre
The first liquid crystal layer thickness adjusting film has a liquid crystal layer thickness in a region corresponding to a coloring film that transmits light in a long wavelength band and a liquid crystal layer thickness in a region corresponding to a coloring film that transmits light in a medium wavelength band. , The thickness of the liquid crystal layer in the region corresponding to the colored film that transmits light in the short wavelength band is incident on each of these regions, transmitted through the colored film, colored the color of the colored film, and transmitted through the liquid crystal layer. Then, the color displayed by mixing the colored lights of the respective colors emitted from the respective regions is set to be white, and the second liquid crystal layer thickness is set.
The adjustment film has a liquid crystal layer thickness in the non-colored light emission region
Is set so that the transmittance of light passing through
It is characterized by that.

That is, the liquid crystal display element of the present invention has three elements.
The transmittance of the colored light of each color that is incident on each region corresponding to each color colored film and that is transmitted through the colored film to be colored in that region and that is transmitted through the liquid crystal layer and emitted from each region is It is adjusted by the wavelength dependence of the transmittance corresponding to the liquid crystal layer thickness of the region, and as described above,
On one of the inner surfaces of the substrates, the first liquid is provided so as to correspond to at least one of the colored films of the three colors which transmits the light of the medium wavelength band and the colored film which transmits the light of the short wavelength band. A crystal layer thickness adjusting film is provided, and a liquid crystal layer thickness in a region corresponding to a coloring film that transmits light in a long wavelength band and a liquid crystal layer thickness in a region corresponding to a coloring film that transmits light in a medium wavelength band. , 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, and is transmitted through the liquid crystal layer while being incident on each of these regions, transmitted through the colored film, and colored with that colored film. Then, the transmittance of the colored light of each color emitted from each of the regions is adjusted , and
Non-colored light emitting area that does not correspond to the colored film in each pixel area
The thickness of the liquid crystal layer in the non-colored light emitting region according to
The second liquid crystal layer thickness adjusting film for adjusting the non-colored light emitting region.
The liquid crystal layer has a maximum transmittance of light that passes through that area.
Is adjusted so that the color balance of the colored lights of the three colors, which are the lights emitted from the regions corresponding to the colored films of the three colors respectively, is improved, and the colored lights of these colors are displayed as a mixture. It is possible to display a bright color image of good color quality , with almost no white banding.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION As described above, the liquid crystal display element of the present invention has a structure in which each pixel area is formed on the inner surface of one of the substrates.
A colored film having an area smaller than the area of the region is formed, and the colored film of at least the medium wavelength band and the colored film of the short wavelength band of at least one of the three colored films are made to correspond to each other. The first liquid crystal layer thickness adjusting film, and the liquid crystal layer thickness in the region corresponding to the colored film that transmits light in the long wavelength band and the liquid crystal layer thickness in the region corresponding to the colored film that transmits light in the medium wavelength band. And the thickness of the liquid crystal layer in the region corresponding to the colored film that transmits light in the short wavelength band, and the liquid crystal layer is formed while being incident on each of these regions and transmitted through the colored film to color the colored film. Adjusting the transmittance of the colored light of each color that is transmitted and emitted from each of the regions , and does not correspond to the colored film of each of the pixel regions.
Corresponding to the non-colored light emitting area
A second liquid crystal layer thickness adjusting film for adjusting the layer thickness of the liquid crystal layer of
Light that has a liquid crystal layer thickness in the non-colored light emission region that passes through that region
By adjusting so that the transmittance of
Improving the color balance of the colored lights of three colors, which are the lights emitted from the respective regions corresponding to the colored films of the three colors, and
High-intensity non-colored light emitted from the non-colored light emission area
Since white is displayed by mixing the colored lights of the respective colors, the displayed white color is almost eliminated and a bright color image of good color quality is displayed.

In the liquid crystal display device of the present invention, the liquid crystal layer thickness in the region corresponding to the colored film transmitting the light in the long wavelength band and the liquid crystal in the region corresponding to the colored film transmitting the light in the medium to long wavelength band. The layer thickness and the liquid crystal layer thickness of the region corresponding to the colored film that transmits light in the short wavelength band are set so that the transmittance of light in each wavelength band that passes through each colored film becomes maximum. If the liquid crystal layer thickness of each region is set in this way, the color balance of the colored lights of the three colors is good, and there is almost no white band displayed by the color mixture of the colored lights of these colors. It is possible to display a color image having good color quality and to brighten the display.

[0012]

When the colored films of the three colors are formed in the areas smaller than the areas of the pixel regions, 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 that adjusts the layer thickness of the liquid crystal layer in the non-colored light emitting area is provided so that the liquid crystal layer thickness in the non-colored light emitting area is approximately maximum. It is desirable to set.

With this configuration, higher-luminance non-colored light 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 the transmittance is almost eliminated. The display brightness and color quality can be further improved.

Further, when the colored films of the three colors are formed in areas smaller than the areas of the pixel regions, respectively,
Set the thickness and area of the colored film to the 1st value on the color system.
Connect 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 colored film of the second color, and the color coordinates of the colored light transmitted through the colored film of the third color. It is desirable to set the area of the color range surrounded by the triangle to a maximum and to set the chroma (C *) of the mixed light of the respective colored lights to a minimum, as described above. 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 area described above. Thus, a color image with good color quality and sufficient brightness can be displayed.

For example, the colored films of the three colors are red, green,
In the case of a color filter of three colors of blue, the film thickness tR of the red filter, the film thickness tG of the green filter, and the film thickness tB of the blue filter are set to have a relationship of tG <tR <tB,
Let the area sR of the red filter, the area sG of the green filter, and the area sB of the blue filter be sR> s.
It is only necessary to set the relationship of B> sG, and by setting the film thickness and area of the color filter of each color in this way, the area of the color range on the color system is increased, and red light and green light are The chroma (C *) of mixed light with blue light can be reduced.

[0017]

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 also 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 element, and FIG. 2 shows a spectral distribution characteristic of light emitted from the liquid crystal display element. FIG. 3 is a diagram showing color coordinates of red, green, and blue colored lights in the CIE1976L * a * b * color system, a color range surrounded by a triangle connecting them, and color coordinates of mixed light. .

The liquid crystal display element of this embodiment is an active matrix type TN (twisted nematic).
Type liquid crystal display element, and as shown in FIG. 1, a pair of transparent substrates (for example, glass substrates) facing each other with the 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 these pixel electrodes 3 (see FIG. (Not shown) and a signal supply wiring (not shown) for supplying a signal to the active element, and the other substrate, for example, the inner surface of the front substrate 1,
A single film-shaped transparent counter electrode 4 that forms a pixel region A by a portion facing the plurality of pixel electrodes 3 is provided.

The pair of substrates 1 and 2 are bonded to each other at their peripheral portions 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. It is formed by enclosing a nematic liquid crystal in the region.

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 rear substrate 2 surface, 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, The source electrode and the drain electrode are formed on both sides of the i-type semiconductor film with the n-type semiconductor film interposed therebetween. The gate insulating film (transparent film) is
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 substrate 1 surface with the TFT. Is integrally formed with the gate electrode and is covered with the gate insulating film except the terminal portion. Further, the data signal supply wiring is formed on the gate insulating film and connected to the drain electrode of the TFT.

The pixel electrode 3 is formed on the gate insulating film, and the pixel electrode 3 has the TF.
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 array 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, colored films of three colors having different transmission wavelength bands, for example, color filters 7R, 7G, and 7B of three colors of red, green, and blue are provided corresponding to the pixel regions A, respectively.

These color filters 7R, 7G, 7B
Are formed in an area smaller than the area of the pixel region A, and the film thicknesses and areas of the color filters 7R, 7G, and 7B of red, green, and blue are CIE1976L shown in FIG. * A * b * a * b in the color system
* The color coordinate RC of the red light transmitted through the red filter 7R and the color coordinate G of the green light transmitted through the green filter 7G on the surface.
C and the color coordinate BC of the blue light transmitted through the blue filter 7B
The area of the color range enclosed by the triangle connecting to and becomes almost maximum, and the chroma (C *) of the mixed light of the red light, the green light, and the blue light, which is indicated by the color coordinate WC, is set to a substantially minimum value. Has been done.

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 thereof is sR, and the thickness of the green filter 7G that transmits light in the intermediate wavelength band is t.
G, its area is sG, the thickness of the blue filter 7B through which light in the short wavelength band is transmitted is tB, and its 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 the lights of red, green, and blue in the color system are described.
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 light, the green light, and the blue light in the color system is used. ) Is small.

The area of the color range on the a * b * plane in the color system is preferably 750 or more, and
Chroma of mixed light (C *) (C of a * = 0, b * = 0)
The distance from the light source) is preferably 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 film thickness tR = 0.9 to 1.2 μm, the green filter film thickness tG = 0.8 to 1.1 μm, the blue filter film thickness tB = 1.1 to 1.4 μm, and the area sR of the red filter 7R. And green filter 7
When the area of the pixel region A is 100%, the area sG of G and the area sB of the blue filter 7B are: red filter area sR = 90 to 95% green filter area sG = 60 to 65% blue filter area sB = 75-80%.

As described above, each of the red, green, and blue color filters 7R, 7G, and 7B is formed in an area smaller than the area of the pixel area A. Therefore, the color filters 7R in each pixel area A are formed. , 7G, 7B (hereinafter referred to as filter corresponding area) a is a colored light emission area, and the color filter 7 in each pixel area A
The region b that does not correspond to R, 7G, and 7B is a non-colored light emission region that allows light that is incident on the front surface of the liquid crystal display element, is reflected by a reflecting means described later, and is emitted to the front surface of the liquid crystal display element to be transmitted without being colored. Has become.

In this embodiment, the color filters 7R, 7G, and 7B of the respective colors are provided in correspondence with the inner regions of the pixel area A excluding the peripheral edge thereof. Is the non-colored light emitting region b over the entire circumference.

Further, on the inner surface of the front-side substrate 1, a green filter 7G of the color filters 7R, 7G, 7B which transmits light in the medium wavelength band and a blue filter 7B which transmits light of the short wavelength band are transmitted. And a liquid crystal layer thickness adjusting film 8 for adjusting the layer thickness of the liquid crystal layer 10 in the filter corresponding region a corresponding to these color filters 7G and 7B, respectively, and non-coloring of all pixel regions A. 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 these liquid crystal layer thickness adjusting films 8 and 8a has almost no wavelength dependence and a transmittance of almost 100%.
And a liquid crystal layer thickness adjusting 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 emitting area b is the entire area of the non-colored light emitting area b of all the pixel areas A and the area between the adjacent pixel areas A on the front substrate 1 surface. Is formed corresponding to.

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

That is, the red, green, and blue color filters 7R, 7G, and 7B are, as is generally known, coated with a photo-curable resin in which a pigment is dispersed on the substrate 1 and photolithography. The liquid crystal layer thickness adjusting films 8 and 8a are formed by patterning, but if a 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 into the color filters 7R. , 7
It can be formed by utilizing the formation process of G and 7B.

The color filters 7R, 7G and 7B and the liquid crystal layer thickness adjusting films 8 and 8a are formed by sequentially forming the red, green and blue color filters 7R, 7G and 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 sequentially formed. In that case, all the color filters 7R,
The total number of patterning steps required to form 7G and 7B and the liquid crystal layer thickness adjusting films 8 and 8a is 6 times.

The green filter 7G and the liquid crystal layer thickness adjusting film 8 thereon, and the blue filter 7B and the liquid crystal layer thickness adjusting film 8 formed thereon are each a photocurable resin in which a pigment is dispersed. And a colorless photocurable resin may be applied in an overlapping manner, and both of them may be simultaneously patterned. According to this method, the patterning of the red filter 7R and the green filter 7G and the liquid crystal layer thereon can be performed. The patterning of the thickness adjusting film 8, the patterning of the blue filter 7B and the liquid crystal layer adjusting film 8 thereon, and the patterning of the second liquid crystal layer adjusting film 8a corresponding to the non-colored light emitting region b are performed four times in total. In the patterning step of, all color filters 7R, 7G, 7B and liquid crystal layer thickness adjusting films 8, 8 are formed.
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 emitting regions b of all the pixel regions A.
a over the above regions, 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, respectively, are subjected to the alignment treatment by rubbing the film surfaces in a predetermined direction.
The liquid crystal molecules of the liquid crystal layer 10 between the substrates 1 and 2 are regulated in the alignment direction in the vicinity of the substrates 1 and 2 by the alignment film 9 of the front substrate 1 and the alignment film 5 of the rear substrate 2, respectively. A predetermined twist angle (for example, approximately 9
It is twisted at 0 °.

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

The liquid crystal display device of this embodiment is in a state where no electric field is applied to the liquid crystal layer 10 (the liquid crystal molecules are aligned in the initial twist alignment state in which the liquid crystal molecules are most collapsed with respect to the surfaces of the substrates 1 and 2). (State) has the highest light transmittance, and the light transmittance decreases as the liquid crystal molecules rise and align with respect to the substrates 1 and 2 by application of an electric field to the liquid crystal layer 10, so-called normally The white mode is displayed. For example, the twist angle of liquid crystal molecules is about 9
In the case of 0 °, the polarizing plates 11 and 12 are provided with their transmission axes substantially orthogonal to each other.

In this embodiment, the thickness of the liquid crystal layer thickness adjusting film 8 provided in correspondence with the green filter 7G and the blue filter 7B is red, green and blue color filters 7R, 7G, respectively. 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 according to the film thickness ratio of 7B.
And the liquid crystal layer thickness dG in the region corresponding to the green filter 7G
And the liquid crystal layer thickness dB in the region corresponding to the blue filter 7B is incident on each of these regions and the color filter 7R,
7G and 7B are transmitted to color the color of the color filter, and at the same time, the color displayed by the additive color mixture of the colored lights of the respective colors transmitted through the liquid crystal layer 10 and emitted from the respective regions is set to be white. There is.

Further, in this embodiment, in order to obtain a brighter display, the red filter 7 that transmits light in the long wavelength band is transmitted.
The liquid crystal layer thickness dR in the region corresponding to R is set so that the light in the long wavelength band (light in the red wavelength band) of the visible light band has a higher transmittance, and the light in the medium wavelength band is The liquid crystal layer thickness dG in the region corresponding to the transmitting green filter 7G is set so that the light in the medium wavelength band (light in the green wavelength band) of the visible light band has a higher transmittance, and the short wavelength The liquid crystal layer thickness dB in the region corresponding to the blue filter 7B that transmits the band light is set so that the light in the short wavelength band (light in the blue wavelength band) of the visible light band has a higher transmittance. And the liquid crystal layer thickness d of the non-colored light emitting region b
W is set so that the light transmittance is almost maximum.

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 reflective display of the liquid crystal display element, light is incident on the liquid crystal display element from a direction perpendicular to the front surface, and the reflected light is emitted in a vertical direction. As a matter of simplification, the wavelength dependence of the transmittance in the case of the reflective display can be obtained by calculating the formula (1) by the square.

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

The transmittance of the reflective liquid crystal display device is calculated as described in (1) above.
When calculated by the square of the formula, for example, the refractive index anisotropy Δn
When a liquid crystal of 0.09 is used, d = 5.8 μm
Light in the long wavelength band (light in the red wavelength band) exhibits higher transmittance, and at d = 4.8 μm, light in the medium wavelength band (light in the green wavelength band) exhibits higher transmittance, and The wavelength dependence that maximizes the transmittance (total transmittance of light in the visible light band) is obtained, and 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, red, green, and blue color filters 7R, 7
The film thickness tR, tG, tB of G, 7B is tR = 1.05μ
When m, 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. The second liquid crystal layer thickness adjusting film 8a corresponding to b is respectively t1 = 1.05 μm, t2 = 1.75 μm, t3 =
The pair of substrates 1 and 2 are formed to have a film 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 the region corresponding to the red filter 7R without the liquid crystal layer thickness adjusting film 8 is 5.8 μm. With this configuration, the red, green, and blue color filters 7R, 7G, 7
The liquid crystal layer thicknesses dR, dG and dB of the respective regions corresponding to B and the liquid crystal layer thickness dW of the non-colored light emitting region b are the liquid crystal layer thicknesses (dR = 5.8 μm d
G = dW = 4.8 μm, dB = 3.8 μm).

This liquid crystal display element performs reflection type display by utilizing external light such as natural light or room light, and the light incident from the front surface is guided by the polarizing plate 11 on the front surface along the absorption axis thereof. The light of the polarized component is absorbed, becomes linearly polarized light of the polarized component along the transmission axis thereof, enters the liquid crystal layer 10, and is rotated by the birefringence in the process of passing through the liquid crystal layer 10. .

The light transmitted through the liquid crystal layer 10 is incident on the polarizing plate 12 on the back side, and the light of the polarization component along the transmission axis of the polarizing plate 12 on the back side is incident on this polarizing plate 12. The image light is transmitted and becomes image light, and the image light is transmitted to the scattering reflector 13.
And is transmitted through the back-side polarizing plate 12, the liquid crystal layer 10, and the front-side polarizing plate 11 one after another and emitted to the front.

At this time, of the light incident on each pixel area A from the front surface, the light transmitted through the filter corresponding area a of the pixel area A is the red, green, and blue color filters 7R, 7G corresponding to the area. 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.

Of the light incident on each pixel area A,
The light incident on the non-colored light emitting region b at the peripheral portion of the pixel region A is reflected as the non-colored light without passing through the color filters 7R, 7G, 7B and is emitted to the front surface of the element. The intensity of the non-colored emitted 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 element, in all the pixel areas A, of the light that enters from the front surface of the liquid crystal display element, is reflected by the scattering reflection plate 13 on the back side, and is emitted to the front surface, the filter corresponding area a. Only the light that passes through is colored in the color of the color filters 7R, 7G, and 7B, and the light that passes through the non-colored light emitting region b passes through without being absorbed by the color filter. The colored pixels of red, green and blue are displayed by the colored light which is the emitted light and the non-colored light which is the emitted light from the non-colored light emitting area b.

To the human eye, the entire color pixel appears to be colored with the color of the colored light, and a full color image is displayed by the additive color mixture of these red, green and blue color pixels. It The color pixel is a high-luminance pixel in which the color of the colored light is slightly lightened, and the density and brightness of the color correspond to the light amount ratio between the colored light and the non-colored light.

Therefore, although the liquid crystal display element is of a reflection type which uses external light for display, each pixel area A
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 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 tG <tR <tB, and the area of the red filter sR, the area of the green filter sG, and the area of the blue filter sB are set to the relationship of sR>sB> sG, and By providing the liquid crystal layer thickness adjusting film 8 having a predetermined film 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 a region corresponding to the red filter 7R,
The liquid crystal layer thickness dG in the region corresponding to the green filter 7G and the liquid crystal layer thickness dB in the region corresponding to the blue filter 7B are made incident on these regions and the color filters 7R, 7G,
The color displayed by the additive color mixture of the colored lights of the respective colors transmitted through the liquid crystal layer 10 and transmitted through the liquid crystal layer 10 is set to be white. , Filter corresponding area a of each pixel area
Improve the color balance of the red, green, and blue colored light emitted from the, and almost eliminate the white band displayed by the mixture of the colored light of each of these colors to obtain a full-color image with good color quality. Can be displayed.

In other words, this liquid crystal display device has red, green,
The color filters 7R, 7G and 7B are made incident on the respective regions a corresponding to the blue color filters 7R, 7G and 7B.
The transmittances of the red, green, and blue colored lights that pass through B and are colored in that color and that also pass through the liquid crystal layer 10 and are emitted from the respective regions a are the liquid crystal layer thicknesses dR and dG of these respective 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 is adjusted as described above by the wavelength dependence of the transmittance corresponding to B. , DG, dB are made incident on each of these areas a, transmitted through the color filters 7R, 7G, 7B and colored to the color of the color filter, and transmitted through the liquid crystal layer 10 and emitted from each area. If the color displayed by the additive color mixture of colored light is set to white, red,
It is possible to display a color image with good color quality by almost eliminating the white banding that is displayed due to the mixture of green and blue colored lights.

Further, in the above liquid crystal display element, by providing the second liquid crystal layer thickness adjusting film 8a having a predetermined film thickness in a region corresponding to the non-colored light emitting region b of each pixel region A, the non-colored light is emitted. Since the liquid crystal layer thickness dW of the emission area b is set so that the light transmittance is substantially maximum, the non-colored light emission area b of each pixel area A emits non-colored light of higher brightness. In addition, the brightness of the display and the color quality can be further improved by almost eliminating the coloration of the non-colored light due to the wavelength dependence of the transmittance.

In the liquid crystal display element, the film thicknesses and areas of the color filters 7R, 7G and 7B for the respective colors of red, green and blue are CIE1976L * a * b * shown in FIG.
On the a * b * plane of the color system, the color coordinates RC of the red light transmitted through the red filter 7R, the color coordinates GC of the green light transmitted through the green filter 7G, and the color of the blue light transmitted through the blue filter 7B. A value in which the area of the color range surrounded by the triangle connecting the coordinates BC becomes substantially maximum, and the chroma (C *) of the mixed light of the red light, the green light, and the blue light shown by the color coordinates WC becomes almost minimum. Therefore, 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 by the liquid crystal layer thickness dR of each filter corresponding region a described above. , DG, dB can be further adjusted by the wavelength dependence of the transmittance to display a color image with good color quality and sufficient brightness.

That is, the chroma (C
*) 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, but as described above, the film thickness tR of the red filter is And the film thickness tG of the green filter and the film thickness tB of the blue filter are set to have a relationship of tG <tR <tB, and the area sR of the red filter, the area sG of the green filter, and the area of the blue filter are set. Area sB and sR
By setting the relation>sB> sG, it is possible to increase the area of the color range on the color system and reduce the chroma (C *) of the mixed light of red light, green light, and blue light. it can.

Then, for example, as in the above embodiment, the film thickness tR of the red filter 7R is 0.9 to 1.2 μm, the film thickness tG of the green filter 7G is 0.8 to 1.1 μm, and the film of the blue filter 7B. 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 of the area of the pixel region A.
0 to 95%, the area sG of the green filter 7G is the pixel area A
If the area sB of the blue filter 7B is set to 75% to 80% of the area of the pixel region A, the C
In the IE1976L * a * b * color system, the area of the color range 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 high transmittance is obtained. 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 spectral distribution characteristics of the emitted light of the liquid crystal display element when G and sB are set to values in the above ranges are shown. In the figure, R, G, and B are the output from the filter corresponding area of each pixel area A. Spectral distributions of red, green, and blue colored lights that are emitted light are shown, and W shows a spectral distribution of uncolored light that is emitted from the uncolored light emitting region b.

As shown in FIG. 2, the liquid crystal display in which the film 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 the respective pixel regions A are lights having good color purity and a good balance of respective transmittances, and the mixed light is transmitted. Good white light with a high rate and almost no color.

That is, in the liquid crystal display device, the color coordinates RC of red light, the color coordinates GC of green light, and the color coordinates BC of blue light on the CIE1976L * a * b * color system shown in FIG. The area of the color range enclosed by the triangle connecting to and is almost maximum (750 or more), and the chroma (C *) of the mixed light of them.
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 element,
You can improve the light transmittance and make the screen sufficiently bright without degrading the chroma (C *) and color balance of each color of red, green, and blue, thus displaying a good-quality full-color image. 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, and Color filters 7R, 7
G, 7B film thickness tR, tG, tB and area sR, sG, s
By setting B and B as described above, the display brightness and color balance are improved, and in addition, in the filter corresponding region a of each pixel region A, a region corresponding to the green filter 7G and the blue filter 7B. And the liquid crystal layer thickness adjusting films 8 and 8a in the non-colored light emitting regions b that do not correspond to the color filters 7R, 7G, and 7B in all the pixel regions A, respectively.
Are provided, and red, green, and blue color filters 7R, 7G, 7B are provided.
By further setting the liquid crystal layer thicknesses dR, dG, and dB of the respective regions corresponding to the above and the liquid crystal layer thickness dW of the non-colored light emitting region b as described above, the brightness and color balance are further improved. According to this liquid crystal display element, it is possible to display a color image of good color quality, which is sufficiently bright and has almost no white band displayed by the color mixture of red, green, and blue colored lights. 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 make the display brighter. However, if the film thickness of the red, green, and blue color filters 7R, 7G, and 7B is reduced and the transmittance of these color filters 7R, 7G, and 7B is increased, the color filters 7R, 7G, and 7B are formed into pixels. Even if it is formed in an area corresponding to the entire area A, the display can be brightened.

FIG. 4 is a sectional view of a part of a liquid crystal display element showing a reference example . The liquid crystal display element of this reference example has red, green and blue color filters 7R, 7G, which correspond to respective pixel regions A, respectively. 7B is a thin film filter having a high transmittance, and these color filters 7R, 7G, and 7B are formed in an area corresponding to almost the entire pixel area A, respectively.

Further, in this reference example , among the color filters 7R, 7G and 7B, on the green filter 7G which transmits the light of the medium wavelength band and the blue filter 7B which transmits the light of the short wavelength band, These color filters 7G,
7B, that is, almost the entire pixel area A, the wavelength dependency is almost zero and the transmittance is almost 100%.
And a liquid crystal layer thickness adjusting film 8 made of an extremely high colorless transparent resin
Is provided.

Each of these liquid crystal layer thickness adjusting films 8 is formed to have a predetermined film thickness, whereby the red filter 7 is formed.
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 color filter 7 is incident on each of these pixel regions A.
Each of the pixel regions A is transmitted through R, 7G, and 7B to be colored in the color of the color filter and transmitted through the liquid crystal layer 10.
It is set so that the color displayed by the additive color mixture of the colored lights of the colors emitted from is 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. Are respectively the above-mentioned first
The conditions may be set to be the same as those in the above embodiment.

That is, for example, the anisotropy of the refractive index of the liquid crystal Δ
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 respectively t1 = 1.05 μm and t2 = 1.75.
The pair of substrates 1 and 2 are formed with a film thickness of μm, and the liquid crystal layer thickness of a region corresponding to the red filter 7R without the liquid crystal layer thickness adjusting film 8 is 5.8 μm via a frame-shaped sealing material. The liquid crystal layer thicknesses dR, dG, and dB of the respective pixel regions A corresponding to the red, green, and blue color filters 7R, 7G, and 7B are joined to obtain dR = 5.8 μm dG = 4.8 μm dB = 3.8 μm By setting to, the transmittance of each color can be increased.

The liquid crystal display element of this reference example is red,
The green and blue color filters 7R, 7G, 7B are thin film filters with high transmittance, and these color filters 7R, 7G
G and 7B are formed in an area corresponding to almost the entire area of the pixel region A, and a liquid crystal layer thickness adjusting film 8 corresponding to the green filter 7G and the blue filter 7B is provided so as to correspond to almost the entire area of the pixel region A. Although there is no non-colored light emission area in the pixel area A, the other configurations are the same as those in the above-described first embodiment, and therefore, duplicate description will be given the same reference numerals in the drawings and omitted.

According to the liquid crystal display element of this reference example , red,
Since the film thickness of the green and blue color filters 7R, 7G, 7B is made thin and the transmittance of these color filters 7R, 7G, 7B is made high, the color filters 7R, 7G,
Even if 7B is formed in an area corresponding to the entire pixel area A,
It is possible to make the display brighter, and therefore, even a reflection type display using external light can display a full-color image with sufficient brightness.

Also in this reference example , 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 made incident on these pixel regions A and transmitted through the color filters 7R, 7G, and 7B. Since the color displayed by the additive color mixture of the colored light of each color that is transmitted through the liquid crystal layer 10 and is emitted from each pixel area A is set to be white, each pixel area A is colored. The color balance of the red, green, and blue colored lights that are emitted from is improved, and the white band displayed by mixing the colored lights of these colors is almost eliminated, resulting in a color image with good color quality. Can be displayed.

In the first embodiment described above, the liquid crystal layer adjusting film 8 is not provided in the region corresponding to the red filter 7R which transmits light in the long wavelength band, but all the colors of red, green and blue are provided. Liquid crystal layer adjusting films 8 are provided in regions corresponding to the filters 7R, 7G, and 7B, and the film thicknesses of the liquid crystal layer adjusting films 8 are selected to obtain red, green, and blue color filters 7R, 7G, and 7B. The liquid crystal layer thicknesses dR, dG, and dB of each pixel region A corresponding to are set so that the color displayed by the additive color mixture of the red, green, and blue colored lights emitted from each pixel region A becomes white. Good.

[0077] In the above you施例, but using the color filter as a coloring layer, wherein the colored film do not limited to a color filter, also, the liquid crystal layer thickness adjusting films 8,8a, a color filter 7R, 7G , 7B may be provided on the inner surface of the substrate 2 opposite to the substrate 1.

[0078] In addition, a liquid crystal display element of the above you施例is,
Although a full-color image is displayed by the additive color mixture of red, green, and blue light, the present invention is directed to magenta, yellow,
It can also be applied to a liquid crystal display device that displays a multicolor image by providing a colored film of three colors of cyan (for example, a color filter). In that case, one of the colored films among the colored films can be formed on the inner surface of one of the substrates. Of the liquid crystal layer thickness adjusting film corresponding to the colored film that transmits at least the medium wavelength band and the colored film that transmits the short wavelength band, respectively, and corresponds to the colored film that transmits the long wavelength band. The liquid crystal layer thickness of the region, the liquid crystal layer thickness of the region corresponding to the colored film that transmits light in the medium wavelength band, and the liquid crystal layer thickness of the region corresponding to the colored film that transmits light in the short wavelength band are In order to make the displayed color white by the color mixture of the colored lights that enter each area and pass through the colored film to be colored in the color of the colored film and that also pass through the liquid crystal layer and exit from each of the previous areas. If set, improve the color balance of the colored light of each color, Almost eliminate the strip color of white displayed by the color mixing of the colored light of these, it is possible to display a color image of good color quality.

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

[0080] The liquid crystal display device of the above you施例places the polarizing plates 11 and 12 on the back side and the front surface side,
Although a reflection plate 13 is arranged on the back surface of the back side polarizing plate 12, instead of this, for example, an electrode (pixel electrode 3 in the above embodiment) provided on the inner surface of the back side substrate 2 is formed of a metal film, The reflection means may be constituted by this electrode, and in this case, the polarizing plate may be only the front side polarizing plate 11.

Further, when the front side polarizing plate 11 and the back side polarizing plate 12 are provided as in the above embodiment, the reflecting plate 13 disposed behind the back side polarizing plate 12 is a semi-transmissive reflecting plate, and the rear side thereof is used. A backlight may be arranged in the display. By doing so, both reflective display using external light and 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 only performs display using light from a backlight. In that case, a film of a colored film such as a color filter is used. Even if the colored film is thick to some extent and the colored film covers almost the entire pixel area, the display can be made bright by increasing the brightness of the backlight.

[0083]

According to the liquid crystal display element of the present invention, the light of the long wavelength band, the medium wavelength band, and the short wavelength band is transmitted to the inner surface of one of the substrates, and the light is smaller than the area of each pixel region.
A first liquid crystal layer thickness adjusting film corresponding to at least a colored film that transmits light in a medium wavelength band and a colored film that transmits light in a short wavelength band among the colored films of three colors formed in a large area. The liquid crystal layer thickness in the region corresponding to the colored film that transmits light in the long wavelength band, the liquid crystal layer thickness in the region corresponding to the colored film that transmits light in the medium wavelength band, and the light in the short wavelength band are transmitted. The thickness of the liquid crystal layer in the region corresponding to the colored film, which is incident on each of these regions, is transmitted through the colored film to color the color of the colored film, and is transmitted through the liquid crystal layer to be emitted from each region. Since the transmittances of the colored lights of the respective colors are adjusted, the color balance of the colored lights of the three colors, which are the lights emitted from the respective regions corresponding to the colored films of the three colors, is improved, and the coloring of the respective colors is performed. Almost completely eliminates the white band displayed by the color mixture of light Moreover, said colored film for each pixel region
Corresponding to the non-colored light emitting area that does not correspond to
Second liquid crystal layer thickness adjustment for adjusting the layer thickness of the liquid crystal layer in the light emitting region
A film is provided so that the thickness of the liquid crystal layer in the non-colored light emitting region is within that range.
Set so that the transmittance of light that passes through
Light that passes through the non-colored light emission area
Corresponds to the colored film by transmitting without being absorbed by the color film
The colored light that is the light emitted from the area
Higher intensity due to non-colored light with high brightness
Since the color pixels having the brightness are displayed, it is possible to display a color image having sufficient brightness and favorable color quality.

In the liquid crystal display device of the present invention, the liquid crystal layer thickness in the region corresponding to the colored film transmitting the light in the long wavelength band and the liquid crystal in the region corresponding to the colored film transmitting the light in the medium to long wavelength band. The layer thickness and the liquid crystal layer thickness of the region corresponding to the colored film that transmits light in the short wavelength band are set so that the transmittance of light in each wavelength band that passes through each colored film is maximized. By doing so, the color balance of the colored lights of the three colors is good, and there is almost no white banding that is displayed due to the color mixture of these colored lights. Can be brightened.

[0085]

When the colored films of the three colors are formed in the areas smaller than the areas of the pixel regions, 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 layer thickness of the liquid crystal layer in the non-colored light emitting area is provided, and the liquid crystal layer thickness in the non-colored light emitting area is set so that the light transmittance is substantially maximum. By doing so, while emitting non-colored light of higher brightness from the non-colored light emission region of each pixel region,
The brightness and color quality of the display can be further improved by almost eliminating the coloration of the non-colored light due to the wavelength dependence of the transmittance.

Further, when the colored films of the three colors are formed in areas smaller than the area of the pixel region, the film thickness and the area of the colored films of the three colors are respectively set to the first color on the color system. A triangle that connects 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 almost maximum and the chroma (C *) of the mixed light of the red light, the green light and the blue light becomes almost minimum, each color transmitted through these colored films is set. The color balance of the colored light of 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 area described above to obtain a color image with good color quality and sufficient brightness. Can be displayed.

For example, the colored films of the three colors are red, green,
In the case of a color filter of three colors of blue, the film thickness tR of the red filter, the film thickness tG of the green filter, and the film thickness tB of the blue filter are set to have a relationship of tG <tR <tB,
Let the area sR of the red filter, the area sG of the green filter, and the area sB of the blue filter be sR> s.
It is only necessary to set the relationship of B> sG, and by setting the film thickness and area of the color filter of each color in this way, the area of the color range on the color system is increased, and red light and green light are The chroma (C *) of mixed light with blue light can be reduced.

Further, in the liquid crystal display element of the present invention, the colored films of the three colors are thin colored films having a high transmittance, and these colored films have an area corresponding to almost the entire pixel region. The liquid crystal layer thickness adjusting film may be formed so as to correspond to almost the entire colored film, and in that case, the liquid crystal layer in the region corresponding to the colored film in each pixel region is described above. By setting as described above, the color balance of the colored lights of the three colors, which are the lights emitted from the colored film corresponding regions of the respective pixel regions, is improved, and the white band displayed by the color mixture of these colored lights is changed. It is possible to display a color image of good color quality with almost nothing.

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 also 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 drawings]

FIG. 1 is a sectional view of a part of a liquid crystal display element showing a first embodiment of the present invention.

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

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

FIG. 4 is a partial cross-sectional view of a liquid crystal display element showing a reference example .

[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 the filter corresponding region dW: Liquid crystal layer thickness in the non-colored light emitting region 11, 12 ... Polarizing plate 13 ... Reflector A ... Pixel area a: Filter compatible area b ... Non-colored light emitting area

─────────────────────────────────────────────────── --Continued from the front page (56) Reference JP-A-7-175050 (JP, A) JP-A-2-287428 (JP, A) JP-A-60-159823 (JP, A) JP-A-61-1 121033 (JP, A) JP 62-14601 (JP, A) JP 61-69091 (JP, A) JP 61-210327 (JP, A) JP 11-109333 (JP, A) JP-A-11-109331 (JP, A) JP-A-11-183891 (JP, A) JP-A-11-109332 (JP, A) JP-A-7-333594 (JP, A) JP-A-5-241142 (JP, A) JP-A-9-218306 (JP, A) JP-A-7-261167 (JP, A) JP-A-10-142621 (JP, A) (58) Fields investigated (Int. Cl. ⁷⁾ , DB name) G02F 1/1335 G02F 1/1333 G02F 1/1343

Claims (6)

(57) [Claims] 1. A plurality of first electrodes are provided on an inner surface of one of a pair of substrates facing each other across a liquid crystal layer,
At least one second electrode forming a pixel region by a portion facing the plurality of first electrodes is provided on the inner surface of the other substrate, and the inner surface of one of the substrates is made to correspond to each of the pixel regions. Surface of each pixel area
A colored film of three colors that is formed in an area smaller than the product and transmits the light of the long wavelength band, the medium wavelength band, and the short wavelength band that have different transmission wavelength bands is provided, and the inner surface of any of the substrates is provided. A layer of a liquid crystal layer in a region corresponding to each of the colored films, which corresponds to at least a colored film that transmits light in an intermediate wavelength band and a colored film that transmits light in a short wavelength band. It corresponds to the first liquid crystal layer thickness adjusting film for adjusting the thickness and the colored film in each of the pixel regions.
The non-colored light emitting area is adjusted according to the non-colored light emitting area.
A second liquid crystal layer thickness adjusting film for adjusting the layer thickness of the liquid crystal layer in the region is provided, and the first liquid crystal layer thickness adjusting film is a colored film that transmits light in a long wavelength band. The liquid crystal layer thickness in the region corresponding to, the liquid crystal layer thickness in the region corresponding to the colored film that transmits light in the medium wavelength band, and the liquid crystal layer thickness in the region corresponding to the colored film that transmits light in the short wavelength band are , The color displayed by the mixture of the colored lights of the respective colors that are incident on each of these regions and that are transmitted through the colored film to be colored with the color of the colored film and that are transmitted through the liquid crystal layer and emitted from each of the regions is white. Is set so that the second liquid crystal layer thickness
The adjustment film has a liquid crystal layer thickness in the non-colored light emission region
Is set so that the transmittance of light passing through
The liquid crystal display element characterized by being. 2. The color coordinates of the colored light transmitted through the colored film of the first color on the color system and the colored film of the second color are respectively defined by the film thickness and the area of the colored film of the three colors. The area of the color range enclosed by the triangle connecting the color coordinates of the transmitted colored light and the color coordinates of the colored light transmitted through the third color film is almost maximum, and the chroma of the mixed light of the respective colored lights is increased. 2. The liquid crystal display element according to claim 1 , wherein (C *) is set to a value that is substantially minimum. 3. The colored film of three colors is a color filter of three colors of red, green and blue, and has a film thickness tR of a red filter, a film thickness tG of a green filter and a film thickness tB of a blue filter. Are in the 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 the relationship of sR <sB <sG. The liquid crystal display element according to claim 2 . 4. The liquid crystal display device according to claim 1, further comprising a light reflecting means on the back side. 5. The second liquid crystal layer thickness adjusting film is provided in the pixel area.
Characterized by being formed over the entire periphery of the area
The liquid crystal display element according to claim 1. 6. The second liquid crystal layer thickness adjusting film is provided in each of the pixels.
Between the non-colored light emitting area of the area and the adjacent pixel area
It is formed in the area | region, The claim 1 characterized by the above-mentioned.
Liquid crystal display element.