JPH11109333A - Liquid crystal display element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display element with a color filter improving a transmissivity of light and having a sufficiently bright picture without deteriorating chroma and color balance of respective colors. SOLUTION: Film thickness tR of a red filter, the film thickness tG of a green filter and the film thickness tB of a blue filter 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 the relation of sR>sB>sG. Then, the areas of color ranges surrounded by triangles connecting light color coordinates of red, green, blue transmitting through color filters of respective colors in a color display system are made to become nearly maximum.

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 two types of liquid crystal display devices: a transmissive type which displays by using light from a backlight, and a reflective type which displays by using external light such as natural light or indoor illumination light. On the other hand, the reflection type liquid crystal display element has a reflection member on the rear surface side for reflecting external light incident from the front surface and emitting the light to the front surface.

As a liquid crystal display element, a TN (twisted nematic) type in which liquid crystal molecules of the liquid crystal layer are twist-oriented at a predetermined twist angle between both substrates is often used. In the element, polarizing plates are arranged on the outer surface of the one substrate and the outer surface of the other substrate, respectively, with their transmission axes oriented in predetermined directions.

There are various types of liquid crystal display elements such as an active matrix type and a simple matrix type. For example, an active matrix type liquid crystal display element has a pair of substrates opposed to each other with a liquid crystal layer interposed therebetween. A plurality of pixel electrodes arranged in a matrix and a plurality of active elements respectively connected to these pixel electrodes are provided on the inner surface of one of the substrates, and the plurality of pixel electrodes are opposed to the plurality of pixel electrodes on the inner surface of the other substrate. A counter electrode for forming a pixel region is provided by the portion to be formed.

Further, there are a liquid crystal display element for displaying a black-and-white image and a liquid crystal display element. For a liquid crystal display element for displaying a multi-color image such as a full-color image, any one of the substrates is used. Are provided with colored films of three colors having different transmission wavelength bands, for example, color filters of three colors of red, green, and blue, respectively, corresponding to respective different pixel regions.

Each of the three color filters of red, green, and blue is formed so as to cover the entire pixel region in order to increase the amount of light transmitted through the corresponding pixel region.

The color filter is formed by using a filter material in which a pigment is dispersed, or is formed by dyeing a transparent film made of casein or the like, so that a color light with sufficient color purity can be obtained. The thickness of the filter is, for example, 1 to 2 in the case of a color filter using a pigment dispersion material.
It is about μm.

[0008]

However, in a liquid crystal display device having a conventional color filter, light in a wavelength band corresponding to the color of the color filter in the visible light band is transmitted through the color filter and colored light. Since the light in the other wavelength band is absorbed by the color filter, the intensity of the emitted colored light is extremely weak with respect to the intensity of the incident light, so that a bright screen cannot be obtained.

This problem can be alleviated to some extent by increasing the brightness of the backlight in the case of a transmissive display element. However, in the case of a reflective display element which makes display using external light, a liquid crystal display is used. Since the light incident from the front surface of the display element passes through the color filter twice before being reflected by the reflection member on the rear surface side and exiting to the front surface, the light absorption is large and the screen becomes considerably dark.

Therefore, conventionally, it has been considered that the film thickness of the red, green and blue color filters is reduced to reduce the absorption of light by the color filters, and the light transmittance is increased to make the screen brighter. However, when the film thickness of the color filter is reduced in this manner, the transmittance of the red, green, and blue colored lights in the absorption wavelength band is also increased, and the color balance of each color light is deteriorated.

FIG. 10 shows a change in transmittance due to a reduction in the thickness of the color filter. The thickness of the color filter is such that a sufficient colored light can be obtained (in the case of a color filter using a pigment dispersion material). About 1.3 to 1.6 μm)
In the case of, light passes through the red, green, and blue color filters at the transmittances shown by the solid lines in the figure, but when the thickness of the color filters is reduced, the red, green, and blue color filters The transmittances shift as indicated by broken lines in the figure, and the average transmittance of the three color filters shifts from the level indicated by the solid line to the level indicated by the broken line.

[0012] The red color due to the thinning of the color filter,
As shown in the figure, the change in the transmittance of the green and blue color filters is such that the red light transmitted through the red filter has a higher transmittance for light on the short wavelength side, which is the absorption wavelength band of the red filter,
The half-width of the green light and the blue light transmitted through the green filter and the blue filter changes in a tendency to increase. As a result, the average transmittance of the three color filters becomes about 500.
The characteristic has a peak with a high transmittance near the wavelength of nm.

For this reason, a liquid crystal display device in which the film thickness of a color filter is reduced, has a color (C)
*) Is low, and the color balance of the light of each color is poor,
Since the display color due to the additive mixture of red, green, and blue light approaches cyan (bluish green), good white display cannot be obtained.

According to the present invention, as a liquid crystal display device having three colored films, the transmittance of light is improved and the screen is sufficiently brightened without deteriorating the chroma (C *) and color balance of each color. It is an object of the present invention to provide a color liquid crystal display device capable of performing the above-mentioned operations.

[0015]

A liquid crystal display device according to the present invention comprises a plurality of first electrodes provided on one of inner surfaces of a pair of front and rear substrates which face each other with a liquid crystal layer interposed therebetween, and a plurality of first electrodes provided on the other side. At least one second region provided on an inner surface and facing the plurality of first electrodes forms a plurality of pixel regions.
And three colored films having different transmission wavelength bands provided on the inner surface of any one of the substrates in correspondence with the respective pixel regions, and the thickness and the area of the three colored films are respectively different. The color coordinates of the colored light transmitted through the first colored film, the color coordinates of the colored light transmitted through the second colored film, and the third colored film transmitted on the color system. The area of a color range surrounded by a triangle that connects the color coordinates of the colored light is set to a value that is substantially maximal.

According to the liquid crystal display device of the present invention, the aforementioned 3
Since the thickness and the area of the color film are set in the above relationship, the light transmittance is improved without deteriorating the chroma (C *) and color balance of each color, and the screen is sufficiently displayed. Can be brightened.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, in the liquid crystal display device of the present invention, the thickness and the area of each of the three color films are determined by the color light transmitted through the first color film in the color system. Color coordinates and
A value at which the area of a color range surrounded by a triangle connecting 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 becomes substantially maximal. With this setting, the transmittance of light is improved and the screen is made sufficiently bright without deteriorating the chroma (C *) and color balance of each color.

In the liquid crystal display device according to the present invention,
When the color film is, for example, a red, green, or blue color filter, the color system is a CIE1976L * a * b * color system, and the color coordinates of red light transmitted through the red filter;
The color coordinates of the green light transmitted through the green filter and the color coordinates of the blue light transmitted through the blue filter are defined by the color system, respectively, and are triangles connecting the three color coordinates on the a * b * plane. By setting the area of the enclosed color range to 750 or more, the brightness of the screen and the chroma (C *) of each color can be sufficiently increased, and the mixed light of the red light, the green light, and the blue light can be obtained. If the chroma (C *) is 1.5 or less, white display with good color balance can be obtained.

The thickness tR of the red filter, the thickness tG of the green filter, and the thickness tB of the blue filter are set to have a relationship of tG <tR <tB, and the area sR of the red filter is The area sG of the green filter and the area sB of the blue filter may be set to satisfy the relationship of sR>sB> sG. In this case, the area of the color range in the color system can be increased. it can.

In this case, among the red, green and blue color filters, at least the area sG of the green filter and the area sB of the blue filter are made smaller than the area of the pixel region, and It is desirable that the non-corresponding region be an emission region of non-colored light. In this case, of the light transmitted through the pixel region, only the light transmitted through the region corresponding to the color filter is absorbed by the color filter. The light in the wavelength band is absorbed and colored,
Light transmitted through the non-colored light emission area is transmitted without being absorbed by the color filter, and is colored light that is light emitted from the area corresponding to the color filter, and light emitted from the non-colored light emission area. Since a high-luminance color pixel is displayed by a certain high-luminance uncolored light, the screen can be made brighter.

Further, the thickness tR of the red filter is 0.1.
9 to 1.2 μm, the thickness tG of the green filter is 0.8 to
1.1 μm, and the thickness tB of the blue filter is 1.1 to 1.4.
μm, the area sR of the red filter is 90 to 95% of the area of the pixel area, the area sG of the green filter is 60 to 65% of the area of the pixel area, and the area sB of the blue filter is the area of the pixel area. If the film thickness and the area of the color filter of each color are set as described above, the area of the color range in the color system is substantially maximized, and the red light, the green light, and the blue light And the transmittance (C *) of the mixed light can be minimized, and a high transmittance can be obtained.

The present invention also provides a transmissive liquid crystal display element for displaying by utilizing light from a backlight, which is provided with a reflecting member on the rear surface side to display by utilizing external light such as natural light or indoor illumination light. The present invention can also be applied to a reflective liquid crystal display element, and even if it is a reflective liquid crystal display element, its screen can be made sufficiently bright.

[0023]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a part of the liquid crystal display device, and FIG.
FIG. 2 is a sectional view taken along the line II-II in FIG. The liquid crystal display element of this embodiment is of an active matrix type using a TFT (thin film transistor) as an active element, and a pair of front and rear substrates (a transparent substrate made of glass or the like) facing each other with a liquid crystal layer 18 interposed therebetween. A plurality of transparent pixel electrodes 3 are arranged in a matrix on the inner surface of the rear substrate 2 and active elements (hereinafter, referred to as TFTs) 4 corresponding to the pixel electrodes 3 are provided. Has been established.

In FIG. 1, the electrode (R) is a pixel electrode for displaying a red pixel, the electrode (G) is a pixel electrode for displaying a green pixel, and the electrode (B) is a blue pixel. These pixel electrodes 3 are alternately arranged in a row direction (the horizontal direction of the screen) and arranged in a straight line, and display pixels of the same color in a column direction (the vertical direction of the screen). Pixel electrodes 3 are alternately shifted in the row direction by about 1.5 pitches and arranged in a zigzag manner.

The TFT 4 is formed by forming a gate electrode 5 formed on the rear substrate 2, a gate insulating film 6 covering the gate electrode 5, and formed on the gate insulating film 6 so as to face the gate electrode 5. And a source electrode 8 and a drain electrode 9 formed on both sides of the i-type semiconductor film 7 via an n-type semiconductor film (not shown).

On the rear substrate 2, a gate line 10 for supplying a gate signal to the TFT 4 in each row is arranged along one side of each pixel electrode row.
The gate electrodes 5 of the TFTs 4 in each row are formed integrally with a gate line 10 corresponding to the row.

The gate insulating film (transparent film) 6 of the TFT 4 is formed over substantially the entire surface of the substrate 2, and the gate line 10 is covered with the gate insulating film 6 except for its terminal. .

On the gate insulating film 6, each TFT 4 in each column is arranged along one side of each pixel electrode column.
A data line 11 for supplying a data signal is connected to the data line 11, and a drain electrode 9 of the TFT 4 in each column is connected to the data line 11 corresponding to the column.

The data lines 11 are arranged in a meandering manner along each pixel electrode column (a zigzag pixel electrode column) for displaying pixels of the same color, and are arranged vertically along the side edges of the pixel electrodes 3 in each row. The horizontal wiring section connecting the wiring sections is wired in parallel with the gate line 10 between adjacent pixel electrode rows.

In this embodiment, the data line 11 is wired on the gate insulating film 6, and the drain electrodes 9 of the TFTs 4 in each column are connected to the data line 1 corresponding to the column.
1, but the data line 11 is
The TFT 4 may be covered with an insulating film and wired thereon, and may be connected to the drain electrode 9 of the TFT 4 at a contact hole provided in the insulating film.

The pixel electrode 3 is formed on the gate insulating film 6, and the pixel electrode 3 is connected to the source electrode 9 of the corresponding TFT 4 at one side edge.

Further, on the rear substrate 2, a compensation capacitance forming electrode (hereinafter, referred to as a pixel electrode 3) opposed to each pixel electrode 3 of the row with the gate insulating film 6 interposed therebetween corresponding to each pixel electrode row. 12 is provided.
The capacitance forming electrode 12, the pixel electrode 3, and the gate insulating film 6 between them constitute a compensation capacitor (storage capacitor) for compensating the fluctuation of the potential of the pixel electrode 3 during the non-selection period.
Are formed. The capacitance forming electrode 12 is formed in parallel with the gate line 10 so as to face a portion slightly inward of the pixel electrode 3 from the edge of the pixel electrode 3 opposite to the TFT connection side.

The gate line 10 and the capacitance forming electrode 12
Is formed of a metal film having a low resistance and a high light reflectance (for example, an aluminum-based alloy), and the data line 11 is also formed of a metal film having a low resistance and a high reflectance. The gate line 10 and the capacitance forming electrode 12 are connected to the pixel electrode 3 and the data line 1 formed on the gate insulating film 6.
In order to increase the withstand voltage between the first electrode and the first electrode, the surface is anodized.

On the inner surface of the rear substrate 2, that is, on the surface on which the pixel electrodes 3 and the TFTs 4, the data lines 11, and the like are formed, an alignment film 13 is provided over the entire pixel electrode arrangement region.

On the other hand, on the inner surface of the front substrate 1, red, green,
The three blue color filters 14R, 14G, 14B
Similarly to the arrangement of the pixel electrodes 3, the pixel electrodes 3 are provided alternately in the row direction and the column direction, and are provided on a transparent protective film (insulating film) 15 formed so as to cover these color filters 14R, 14G, and 14B. A transparent opposing electrode 16 in the form of a single film is provided, which opposes all of the pixel electrodes 3 and the regions opposing the pixel electrodes 3 each form a pixel region A, and an alignment film 17 is formed thereon. Have been. The protective film (insulating film) 15 is formed of the color filters 14R, 14R.
G and 14B can be omitted by appropriately selecting the material.

The front substrate 1 and the rear substrate 2 are
The peripheral portion is joined via a frame-shaped sealing material (not shown), and a liquid crystal layer 18 is provided between the two substrates 1 and 2 in a region surrounded by the sealing material.

The alignment films 13 and 17 provided on the inner surfaces of the pair of substrates 1 and 2 are each 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 18 in the vicinity of the respective substrates 1 and 2 is regulated by the alignment film 13 of the rear substrate 2 and the alignment film 17 of the front substrate 1. Twist angle (eg, approximately 90
°) twist orientation.

Polarizing plates 21 and 22 are disposed on the outer surfaces of the pair of substrates 1 and 2, respectively. These polarizing plates 21 and 22 have their transmission axes oriented in predetermined directions. The liquid crystal display element of this embodiment is in a state where no electric field is applied to the liquid crystal layer 18 (the liquid crystal molecules are aligned in the initial twist alignment state where the liquid crystal molecules are most inclined with respect to the substrates 1 and 2). Display is a bright display, and the application of an electric field to the liquid crystal layer 18 causes the liquid crystal molecules to rise and align with respect to the substrates 1 and 2 so that the light emission rate is reduced and the display is performed. Is a TN-type liquid crystal display element that performs display in a so-called normally white mode. For example, when the twist angle of liquid crystal molecules is approximately 90 °, the polarizing plates 21 and 22 move their transmission axes to each other. Almost orthogonal Not provided.

Further, behind the rear polarizing plate 22,
A scattering reflector 23 is arranged as a reflecting member for reflecting light that has entered the liquid crystal display element from the front side and transmitted through the liquid crystal layer 18.

The red, green and blue color filters 14R, 14 provided on the inner surface of the front substrate 1 of the liquid crystal display element.
The color filters 14R, 14G, and 14B are filters using a pigment dispersion material.
Of the G and 14B, the red filter 14R corresponds to the pixel region A where the (R) pixel electrode 3 and the counter electrode 16 for displaying a red pixel are opposed, and the green filter 14G is for displaying a green pixel. (G) corresponds to the pixel area A where the pixel electrode 3 and the counter electrode 16 face each other, and the blue filter 1
4B corresponds to the pixel region A where the pixel electrode 3 and the counter electrode 16 of (B) for displaying a blue pixel face each other.

The red, green and blue color filters 14R,
The film thickness and the area of 14G and 14B are respectively the color coordinates R of the red light transmitted through the red filter 14R on the a * b * plane in the CIE1976L * a * b * color system shown in FIG.
C and the color coordinate G of the green light transmitted through the green filter 14G
C and the color coordinates B of the blue light transmitted through the blue filter 14B
The area of the color range surrounded by the triangle connecting C and C is substantially maximized, 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. Is set.

That is, the red, green and blue color filters 1
Of the 4R, 14G, and 14B, the thickness of the red filter 14R through which light in the long wavelength band passes is tR, the area thereof is sR, and the thickness of the green filter 14G through which light in the intermediate wavelength band passes is tG, the area thereof. Is sG, the thickness of the blue filter 14B through which light in the short wavelength band is transmitted is tB, and the area thereof is sG.
B, in this embodiment, by setting the relationship of tG <tR <tB and setting of the relationship of sR>sB> sG, the light colors of red, green, and blue in the color system are set. Coordinate R
The area of the color range surrounded by the triangle connecting the points C, GC, and BC is increased, and the chroma (white light) of the mixed light (red light, green light, and blue light) of the red, green, and blue lights in the color system is used. C
*) Is reduced.

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 14R,
More specifically, the film thickness and area of the red filter 14R will be described in this embodiment.
, The thickness tG of the green filter and the thickness t of the blue filter
B, red filter thickness tR = 0.9 to 1.2 μm, green filter thickness tG = 0.8 to 1.1 μm, blue filter thickness tB = 1.1 to 1.4 μm, and the area of red filter 14R The area sR, the area sG of the green filter 14G, and the area sB of the blue filter 14B are calculated by setting the area of the pixel region A (the area of the pixel electrode 3) to 10
Assuming 0%, the red filter area sR = 90-95%, the green filter area sG = 60-65%, and the blue filter area sB = 75-80%.

As described above, each of the red, green, and blue color filters 14R, 14G, and 14B is formed to have an area smaller than the area of the pixel area A. Therefore, the color filters 14R, 14R, Only the regions a (hereinafter, referred to as filter corresponding regions) a corresponding to 14G and 14B are the emission regions of the colored light, and the color filters 14R and 1R.
The region b not corresponding to 4G and 14B is an emission of non-colored light that is incident on the liquid crystal display element from the front side, is reflected by the rear reflector 23, and is transmitted without coloring the light emitted to the front side of the liquid crystal display element. Area.

In this embodiment, the color filter 1 of each color is used.
4R, 14G, and 14B are provided inside the pixel region A except for the peripheral portion, and are opposed to the region on the TFT connection side with respect to the above-described compensation capacitance unit. The peripheral portion is a non-colored light emission region b over the entire circumference.

Note that, of the light incident on each pixel region A from the front surface of the liquid crystal display element, the light incident on the compensation capacitance portion is blocked by the capacitance forming electrode 12 and does not enter the reflection plate 23. Since the electrode 12 is formed of a metal film having a high reflectivity, light incident on the compensation capacitance portion is reflected by the capacitance forming electrode 12.

Further, a region between adjacent pixel regions A,
In other words, the region where there is no electric field (the region where the liquid crystal molecules are always oriented in the initial twisted state) always enters the scattering reflector 23, the gate line 10, the data line 11 or the capacitance forming electrode 12. This is a bright display area c that is reflected and emitted to the front.

That is, the gate lines 10 and the data lines 11 provided on the inner surface of the rear substrate 2 pass through the bright display area c, and the capacitance forming electrodes 12 also cross the bright display area c. Therefore, of the light incident on the bright display area c from the front surface of the liquid crystal display element, the light incident on the portion where the gate line 10 and the data line 11 pass through the capacitance forming electrode 12 does not enter the reflection plate 23,
Since the gate line 10, the data line 11, and the capacitance forming electrode 12 are formed of a metal film having a high reflectance,
Light incident on these portions is also reflected.

This liquid crystal display element performs reflection type display using external light. Light incident from the front surface of the liquid crystal display element is absorbed by the front polarizing plate 21 into light of a polarized component along its absorption axis. As a result, the light becomes linearly polarized light having a polarization component along the transmission axis, enters the liquid crystal layer 18, and is rotated by the birefringence in the process of transmitting the liquid crystal layer 18 through the transmission.

The light transmitted through the liquid crystal layer 18 is
The light incident on the rear polarizing plate 22 and, of the light, a light having a polarization component along the transmission axis of the rear polarizing plate 22
Is transmitted to form image light, and the image light is transmitted to the scattering reflector 2.
3, the light is sequentially transmitted through the rear polarizer 22, the liquid crystal layer 18, and the front polarizer 21, and is emitted to the front.

At this time, of the light incident on each pixel region A from the front surface, the light transmitted through the filter corresponding region a of the pixel region A is absorbed by the color filters 14R, 14G, and 14B in the absorption wavelength band. Then, the light is colored to 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 17.

Of the light incident on each of the pixel areas A, the light incident on the non-colored light emitting area b at the peripheral portion of the pixel area A does not pass through the color filters 14R, 14G, and 14B. The light is reflected as it is and emitted to the front 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 17.

That is, in this liquid crystal display element, 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 23 on the rear surface side, and emitted to the front surface, the filter corresponding region a Only the light transmitted through the color filter 14R, 14G, 14B is colored in the color of the color filters 14R, 14G, and 14B, and the light transmitted through the non-colored light emission area b is transmitted without being absorbed by the color filter. The color pixel is displayed by the colored light that is the light emitted from the non-colored light emitting region b and the non-colored light that is the light emitted from the uncolored light emitting region b.

FIG. 3 is a diagram showing the pixel arrangement of the liquid crystal display element. Each pixel A 'has one of red R, green G, and blue B colored light (light emitted from the filter corresponding area a). FIG.
, And non-colored light (light outside the hatched area in FIG. 3) which is light emitted from the non-colored light emission area b.
To the human eye, the entire pixel A 'appears to be colored in the color of the colored light, and a full-color image is displayed by the additive mixture of the red, green, and blue pixels A'. Note that the pixel A ′ is a high-luminance pixel 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.

Further, the light incident on the bright display area c between the adjacent pixel areas A is reflected as non-colored light and emitted to the front of the element. The non-colored light emitted from the bright display area c is such that the bright display area c is always in an electric field-free state, and the liquid crystal molecules are always aligned in the initial twist alignment state.
It is always high intensity light.

In this liquid crystal display element, as described above, the thickness tR of the red filter, the thickness tG of the green filter, and the thickness tB of the blue filter are defined as tG <tR <t.
B, 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.
, The color coordinates RC of the red light transmitted through the red filter 14R, the color coordinates GC of the green light transmitted through the green filter 14G, and the blue light transmitted through the blue filter 14B in the CIE1976L * a * b * color system shown in FIG. Can be increased in the area of the color range surrounded by the triangle connecting the color coordinates BC. The chroma (C *) of each color is indicated by the distance from each vertex of the triangle to the origin of the color coordinates.

In this liquid crystal display device, red, green,
Thickness t of blue color filters 14R, 14G, 14B
Since R, tG, tB and areas sR, sG, sB are each set to a value at which the area of the color range is substantially maximal, the chroma (C *) of each color is increased to deteriorate the color balance. In addition, the screen can be made sufficiently bright by improving the light transmittance.

That is, for example, as in the above embodiment, the thickness tR of the red filter 14R is 0.9 to 1.2 μm, the thickness tG of the green filter 14G is 0.8 to 1.1 μm, and the thickness of the blue filter 14B is The thickness tB is set to 1.1 to 1.4 μm, and the area sR of the red filter 14R is set to the pixel area A.
90% to 95% of the area of the green filter 14G
60 to 65% of the area of the pixel region A, the blue filter 14
If the area sB of B is set to be 75 to 80% of the area of the pixel area A, the area of the color range in the CIE1976L * a * b * color system is substantially maximized, and the red light, green light, and blue The chroma (C *) of the mixed light with the light can be minimized, and a high transmittance can be obtained.

FIG. 4 shows the film thicknesses tR, t of the color filters 14R, 14G, 14B of the respective colors in the liquid crystal display device.
The color range, the chroma (C *) of the mixed light, and the lightness (L *) in the CIE1976L * a * b * color system with respect to changes in G and tB are shown, respectively. Here, the characteristics are shown when the area sR, sG, sB of each color filter 14R, 14G, 14B is 80% of the area of the pixel region A.

FIG. 4A shows the change characteristic of the color range with respect to the filter film thickness. In the figure, solid lines indicate the film thicknesses tG and tB of the two color filters 14G and 14B of green and blue. Are fixed to 1.5 μm, respectively, and only the film thickness tR of the red filter 14R is changed. The chain line indicates that the film thicknesses tR, tB of the red and blue color filters 14R, 14B are respectively 1. Characteristics when the thickness is fixed at 5 μm and only the thickness tG of the green filter 14G is changed,
Dashed lines indicate red and green color filters 14R and 14G.
This shows the characteristics when the film thicknesses tR and tG are fixed to 1.5 μm, respectively, and only the film thickness tB of the blue filter 14B is changed.

As can be seen from the figure, when the thickness of the red filter (solid line) and the thickness of the green filter (dashed line) are reduced, the color range is sharply narrowed. Change is small. For each color filter, there is a film thickness at which the color range shows a maximum value.

FIG. 4B shows the change characteristics of the chroma (C *) of the mixed light with respect to the filter film thickness. In the figure, the solid lines indicate the color filters 14G of two colors of green and blue.
When the thicknesses tG and tB of the red filter 14B are fixed to 1.5 μm, respectively, and only the thickness tR of the red filter 14R is changed, the dashed line indicates the red and blue color filters 14B.
The characteristics when the film thicknesses tR and tB of R and 14B are fixed to 1.5 μm, respectively, and only the film thickness tG of the green filter 14G are changed. The broken line is a color filter 1 of two colors of red and green.
The graph shows characteristics when the film thicknesses tR and tG of 4R and 14G are fixed to 1.5 μm, respectively, and only the film thickness tB of the blue filter 14B is changed.

As can be seen from the figure, when the film thickness of the green filter (chain line) is reduced, the chroma (C *) is small and the color balance is good, and the film thickness of the red filter (solid line) and the blue filter (dashed line) is small. Chroma (C
When *) is large and the film thickness is large, the chroma (C *) is small and the color balance is good.

FIG. 4C shows the change characteristics of the lightness (L *) of the mixed light with respect to the filter film thickness. In the figure, the solid lines indicate the two color filters 14G, 1 of green and blue.
The thicknesses tG and tB of 4B are fixed at 1.5 μm, respectively.
The characteristics when only the film thickness tR of the red filter 14R is changed, and the dashed lines are the red and blue color filters 14R,
The characteristics when the film thickness tR and tB of the green filter 14B are fixed to 1.5 μm and the film thickness tG of the green filter 14G alone is changed, and the broken lines are the red and green color filters 14G.
The graph shows characteristics when the film thicknesses tR and tG of R and 14G are fixed at 1.5 μm, respectively, and only the film thickness tB of the blue filter 14B is changed.

As shown in this figure, when the film thickness of the color filter is small, the value of the lightness (L *) increases, and this tendency is particularly remarkable in the case of the red filter (solid line). As described above, according to FIG. 4A, there is a film thickness in which the color range has a maximum value for each color filter.
According to (b), to reduce the chroma (C *), the thickness (tG) of the green filter is reduced, and the thickness (tB) of the blue filter is increased. Further, according to FIG. It is shown that in order to increase the lightness (L *), the thickness of each filter is made thinner, and in particular, the thinner the thickness (tR) of the red filter is, the better.

Therefore, the liquid crystal display device of the present embodiment has the structure shown in FIG.
Based on FIG. 4A, the film thickness of each color filter is set to a range in which the color range shows the maximum value, and based on FIG. The thickness (tB) of the green filter is set to the thickest, the thickness of the green filter is set to an intermediate value, and each of the thicknesses becomes smaller in the range where the color range shows the maximum value based on FIG. The thickness of each filter is set as described above.

FIG. 5 shows the area s of the color filters 14R, 14G, 14B of each color in the liquid crystal display device.
The color range of the color system with respect to the change in the area ratio of R, sG, and sB, and the chroma (C *) and lightness (L *) of the mixed light
Here, the characteristics are shown when the thickness tR, tG, tB of each color filter 14R, 14G, 14B is set to 1.5 μm of the area of the pixel region A.

FIG. 5A shows the change characteristics of the color range with respect to the filter area. In the figure, the solid lines indicate the areas sG and sB of the green and blue color filters 14G and 14B, respectively. The characteristics when the area is fixed to 80% of the area of the pixel region A and only the area sR of the red filter 14R is changed, and a chain line is a color filter 1 of two colors of red and blue.
The areas sR and sB of 4R and 14B are fixed to 80% of the area of the pixel region A, respectively, and the area sG of the green filter 14G is fixed.
The dashed line indicates that the area sR and sG of the red and green color filters 14R and 14G are fixed to 80% of the area of the pixel region A, respectively, and that only the area sB of the blue filter 14B is changed. Shows the characteristics when.

According to this figure, the chromaticity range increases as the area ratio of each color filter increases. FIG. 5B shows the change characteristics of the chroma (C *) of the mixed light with respect to the filter area. In the figure, the solid lines indicate the areas sG and sB of the green and blue color filters 14G and 14B. Are fixed to 80% of the area of the pixel region A, respectively.
The characteristic when only the area sR of 4R is changed, the chain line is
Area s of red and blue color filters 14R and 14B
R and sB are fixed to 80% of the area of the pixel region A, respectively, and the characteristics when only the area sG of the green filter 14G is changed. The broken lines indicate the two color filters 14 of red and green.
The characteristics are shown when the areas sR and sG of R and 14G are fixed to 80% of the area of the pixel region A, respectively, and only the area sB of the blue filter 14B is changed.

According to this figure, when the area ratio of the green filter (chain line) is close to 60%, the chroma (C *) of the mixed light is minimal, and the chroma (C *) of the mixed light of the blue filter (dashed line) is small. The minimum area ratio is higher than the area ratio where the chroma (C *) of the mixed light of green (chain line) is minimum, and the area ratio where the chroma (C *) of the mixed light of the red filter (solid line) is minimum. Chroma (C *) of the mixed light of the blue filter (broken line) is higher than the area ratio at which it becomes minimal. FIG. 5 (c)
Shows the change characteristics of the lightness (L *) of the mixed light with respect to the filter area. In the figure, the solid lines indicate the areas sG and sB of the two color filters 14G and 14B of green and blue, respectively, of the pixel area A. The characteristic when the area is fixed to 80% of the area and only the area sR of the red filter 14R is changed, and the chain line indicates the areas sR and sB of the two color filters 14R and 14B of red and blue, respectively, the area of the pixel area A. And the characteristic when only the area sG of the green filter 14G is changed. The broken line indicates the color filter 1 of two colors of red and green.
The areas sR and sG of 4R and 14G are each fixed to 80% of the area of the pixel region A, and the area sB of the blue filter 14B is fixed.
Shows the characteristics when only the value is changed.

According to this figure, the smaller the area ratio of each color filter, the greater the lightness (L *) of the mixed light. As described above, according to FIG. 5A, as the area ratio of the filter of each color increases, the color range increases.
According to FIG. 5B, the area ratio of each filter at which the minimum of the chroma (C *) of the mixed light appears is larger in the order of the green filter (sG), the blue filter (sB), and the red filter (sR). Further, FIG. 5C shows that the smaller the area ratio of each filter, the better the brightness (L *) of the mixed light.

Therefore, the liquid crystal display device of this embodiment is the same as that of FIG.
Based on (b), the area ratio of each color filter is increased in the order of the green filter, the blue filter, and the red filter, and based on FIGS. 5A and 5C, the color range and the lightness (L) of the mixed light. The area ratio of each of the filters is set so that the values of *) do not decrease.

The chroma (C *) and lightness (L *) of the color range and the mixed light shown in FIGS. 4 and 5 are red, which is the light emitted from the filter corresponding area a of each pixel area A, and
The value of the mixed light of the green and blue colored light, the uncolored light emitted from the uncolored light emission area b, and the uncolored light emitted from the bright display area c between adjacent pixel areas. It is.

Next, in the liquid crystal display device of this embodiment,
The film thickness t of each color filter 14R, 14G, 14B
FIG. 6 shows the color range on the color system and the values of chroma (C *) and lightness (L *) of the mixed light when R, tG, tB and areas sR, sG, sB are set to various values. And FIG. .

FIG. 6 shows the area sR of the red filter 14R.
And the area sG of the green filter 14G and the blue filter 1
SR = 90%, sG = 60%, sB = 75%
And the film thickness tR of the red filter 14R, the film thickness tG of the green filter 14G, and the film thickness t of the blue filter 14B.
B and the green filter film thickness tG = tR−0.10 μm, and the blue filter film thickness tB = tR + 0.20 μm. (B) shows the chroma of mixed light (C
*), And (c) shows the brightness (L *) of the mixed light.
Shows the change characteristics.

As shown in FIG. 6, according to FIG. 6 (a), when the thickness of the red filter is less than 0.9 μm, it is difficult to display a large number of colors sufficient for full-color display. It is smaller than the required color range value of 750, and exceeds the value of the color range 750 in the range of 0.9 μm or more and 1.2 μm or less.

According to FIG. 6 (b), the chroma (C *) value of the mixed light (white light) is substantially within the range of the film thickness of the red filter from 0.9 μm to 1.2 μm. Chroma (C *) required to perform white display without coloring
Becomes 1.5 or less.

Further, according to FIG. 7 (c), the lightness (L *) of the mixed light (white light) is 0.9 when the film thickness of the red filter is 0.9.
In the range of not less than μm and not more than 1.2 μm, the lightness (L *) required for performing a sufficiently bright display is a value of not less than 52.

FIG. 7 shows the thickness tR of the red filter 14R.
, The thickness tG of the green filter 14G, and the blue filter 1
The thickness tB of 4B is defined as tR = 1.0 μm and tG = 0.9.
μm, tB = 1.2 μm, and the red filter 14R
, The area sR of the green filter 14G, and the area sB of the blue filter 14B are changed in a relationship of green filter area sG = sR-30% and blue filter film thickness sB = sR-15%. (A) shows the change characteristic of the color range, and (b) shows the chroma (C) of the mixed light.
*), And (c) shows the brightness (L *) of the mixed light.
Shows the change characteristics.

As shown in FIG. 7, according to FIG. 7 (a), when the area ratio of the red filter is less than 90%, the color range of each display color is sufficient for full-color display. When the area ratio of the red filter is 90% or more, the value becomes smaller than 750, which is the value of the color range required for displaying a large number of colors.

According to FIG. 7 (b), the chroma (C *) of the mixed light (white light) of each color is substantially reduced when the area ratio of the red filter is 80% or more and 100% or less. Chroma (C) required to perform white display without coloring
*) Is 1.5 or less.

Further, according to FIG. 7 (c), the lightness (L *) of the mixed light (white light) of each color is necessary for performing a sufficiently bright display when the area ratio of the red filter is 80% or more. The brightness (L *) to be obtained exceeds the value of 52.

The chroma (C *) and lightness (L *) of the color range and the mixed light shown in FIGS. 6 and 7 are also red, which is the light emitted from the filter corresponding area a of each pixel area A.
The value of the mixed light of the green and blue colored light, the uncolored light emitted from the uncolored light emission area b, and the uncolored light emitted from the bright display area c between adjacent pixel areas. It is.

The color range of the liquid crystal display device set to various values shown in FIGS. 6 and 7 and the chroma (C *) of the mixed light
And lightness (L *) values, CIE1976L *
In the a * b * color system, the area of the color range on the a * b * plane becomes almost maximum, and the chroma (C *) of the mixed light of red light, green light and blue light becomes almost minimum, The filter thickness and the filter area (ratio to the area of the pixel region A) at which the lightness (L *) of the mixed light is sufficient are as follows: red filter thickness tR = 0.9 to 1.2 μm green filter thickness tG = 0.8-1.1 μm Blue filter film thickness tB = 1.1-1.4 μm Red filter area sR = 90-95% Green filter area sG = 60-65% Blue filter area sB = 75-80% Yes, red, green and blue color filters 14R, 14G,
14B thickness tR, tG, tB and area sR, sG, sB
Is set to a value in the above range, the area of the color range is set to 750 or more, which is a value necessary for displaying a large number of colors sufficient for full-color display, and the chroma (C *) Is a value required to obtain 1.5 or less, which is a value necessary for performing white display with substantially no coloration, and a value for obtaining sufficient brightness (L *) of the mixed light. It can be more than the value near 52.

FIG. 8 shows a color filter 14 for red, green and blue.
R, 14G, 14B film thicknesses tR, tG, tB and area s
This figure shows the spectral distribution characteristics of the emitted light of the liquid crystal display element in this embodiment when R, sG, and sB are set to the values in the above ranges, respectively. Shows the spectral distribution of each of the red, green, and blue colored light that is the light emitted from the filter corresponding area. W represents the red, green, and blue colored light and the uncolored light emitting area b of each pixel area A. 5 shows the spectral distribution of the outgoing light from the liquid crystal display element of the present embodiment including the non-colored light that is the outgoing light of the present embodiment and the non-colored light that is the outgoing light from the bright display region c between the adjacent pixel regions. .

As shown in FIG. 8, the film thicknesses tR, tG, tB of the red, green, and blue color filters 14R, 14G, 14B.
And the areas sR, sG, and sB are set to values in the above ranges, respectively, the red, green, and blue colored light R, G, and B from each pixel area A have good color purity. The mixed light is a light having a good balance of transmittance, and the mixed light is a good white light having a high transmittance and almost no 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.

Further, in the above embodiment, since the areas of the red, green, and blue color filters 14R, 14G, and 14B are smaller than the area of the pixel region A, the front surface of the liquid crystal display element is provided in all the pixel regions A. Out of the light reflected by the scattering reflection plate 23 on the rear surface side and emitted to the front surface, only the light transmitted through the filter corresponding region a is the color filter 1.
4R, 14G, and 14B, the light that is transmitted through the non-colored light emission area b without being absorbed by the color filter, and is the light that is emitted from the filter corresponding area a; High-luminance color pixels are displayed by the high-luminance non-colored light that is the light emitted from the non-colored light-emitting region b.

Therefore, the above-mentioned liquid crystal display element is of a reflection type in which display is performed using external light. However, each pixel area A displays a high-luminance color pixel to further increase the brightness of the screen. be able to.

Furthermore, in the above embodiment, the area between the adjacent pixel areas A is the bright display area c in which the light incident from the front of the liquid crystal display element is reflected by the reflector 23 and emitted to the front of the element. The area between the pixel regions A can be brightened, and the screen can be further brightened.

In the above embodiment, the area of each of the red, green, and blue color filters 14R, 14G, and 14B is smaller than the area of the pixel area A. The area of the red filter 14R may be substantially the same as the area of the pixel region A.

Further, the liquid crystal display device of the above embodiment has red,
The pixel electrodes 3 for displaying green and blue pixels are alternately arranged in a row direction and arranged in a straight line, and the pixel electrodes 3 for displaying pixels of the same color are arranged in a column direction by about 1.5. It is a so-called mosaic arrangement type in which the pitch is alternately shifted in the row direction in a zigzag manner.
The present invention can also be applied to a so-called grid-type liquid crystal display element in which pixel electrodes 3 for displaying green and blue pixels are linearly arranged in both the row direction and the column direction.

Further, in the above embodiment, a color filter is used as a colored film, but the colored film is not limited to a color filter. Further, the liquid crystal display device of the above embodiment 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 color image by subtractive color mixing. In the CIE1976L * a * b * color system, the color coordinates of the colored light transmitted through the colored film of the first color, the color coordinates of the colored light transmitted through the colored film of the second color, and the color coordinates of the third color By setting the area of the color range surrounded by the triangle connecting the color coordinates of the colored light transmitted through the colored film to a value that is almost maximal, the chroma (C *) and the color balance of each color are not deteriorated. The screen can be made sufficiently bright by improving the light transmittance.

The present invention is not limited to the active matrix type. 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 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.

Further, in the liquid crystal display device of the above embodiment, the polarizing plates 21 and 22 are disposed on the front and rear surfaces thereof, and the reflecting plate 23 is disposed behind the back polarizing plate 22. For example, an electrode (the pixel electrode 3 in the above embodiment) provided on the inner surface of the back substrate 2 may be formed of a metal film, and this electrode may also serve as a reflection member. In this case, the polarizing plate is only the front polarizing plate 21. Good.

Also, as in the above embodiment, the front polarizing plate 21
And the rear polarizing plate 22, the rear polarizing plate 2
2 may be a semi-transmissive reflector, and a backlight may be provided behind the reflector 23. In this case, the reflective display using external light and the light from the backlight can be used. Both of the transmission type display to be used can be performed. In addition, the present invention can be applied to a transmission type liquid crystal display element that performs only display using light from a backlight.

[0099]

According to the liquid crystal display device of the present invention, the thicknesses and areas of the three colored films are set to CIE1976L * a * b.
* In the color system, the color coordinates of the colored light transmitted through the colored film of the first color, the color coordinates of the colored light transmitted through the colored film of the second color, and transmitted through the colored film of the third color. Since the area of the color range surrounded by the triangle connecting the color coordinates of the colored light is set to a value that is substantially maximal, light transmission without deteriorating the chroma (C *) and color balance of each color. The ratio can be improved to make the screen sufficiently bright.

Further, 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, and the area sR of the red filter is Since the area sG of the green filter and the area sB of the blue filter are set to satisfy the relationship of sR>sB> sG, the area of the color range in the color system can be increased.

In this case, among the red, green and blue color filters, at least the area sG of the green filter and the area sB of the blue filter are made smaller than the area of the pixel region, and If the non-corresponding region is an emission region of uncolored light, only the light transmitted through the region corresponding to the color filter among the light transmitted through the pixel region is absorbed by the color filter in the absorption wavelength band. Light that passes through the colored, non-colored light emission area is transmitted without being absorbed by the color filter, and is colored light that is light emitted from the area corresponding to the color filter, and light from the non-colored light emission area. Since the high-luminance color pixels are displayed by the high-luminance uncolored light that is the emitted light, the screen can be made brighter.

The red filter has a thickness tR of 0.1.
9 to 1.2 μm, the thickness tG of the green filter is 0.8 to
1.1 μm, and the thickness tB of the blue filter is 1.1 to 1.4.
μm, the area sR of the red filter is 90 to 95% of the area of the pixel area, the area sG of the green filter is 60 to 65% of the area of the pixel area, and the area sB of the blue filter is the area of the pixel area. It is preferable that the area of the color range on the a * b * plane is almost maximized by setting the film thickness and the area of the color filter of each color in this manner, and the red light and the green The chroma (C *) of the mixed light of the light and the blue light can be minimized, and a high transmittance can be obtained.

As described above, in the liquid crystal display device of the present invention, when the three color films are, for example, red, green and blue color filters, the red, green and blue color filters are transmitted through the a * b * plane. The area of the color range surrounded by a triangle connecting the color coordinates of the red light, the color coordinates of the green light transmitted through the green filter, and the color coordinates of the blue light transmitted through the blue filter is 75.
0 or more, the screen brightness and the chroma (C
*) And the color balance can be made sufficiently high, and the chroma (C *) of the mixed light of the red light, the green light and the blue light on the a * b * plane is 1.5 or less. By doing so, a good white display can be obtained.

The present invention also provides a transmissive liquid crystal display element for displaying by using light from a backlight, which is provided with a reflecting member on the rear surface side to display by using external light such as natural light or indoor illumination light. The present invention can also be applied to a reflective liquid crystal display element, and even if it is a reflective liquid crystal display element, its screen can be made sufficiently bright.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a diagram showing a pixel arrangement of the liquid crystal display element.

FIG. 4 is a view showing a color range and a change characteristic of chroma (C *) and lightness (L *) of mixed light with respect to a film thickness of a color filter of each color in the liquid crystal display element.

FIG. 5 is a diagram showing a color range and a change characteristic of chroma (C *) and lightness (L *) of mixed light with respect to an area of a color filter of each color in the liquid crystal display element.

FIG. 6 shows a red filter area sR and a green filter area s.
G and the blue filter area sB, sR = 90%, sG
= 60% and sB = 75%, and the thickness tR of the red filter, the thickness tG of the green filter, and the thickness tB of the blue filter are defined as tG = tR−0.10 μm, tB = tR +
The figure which shows the change characteristic of the color gamut, the change characteristic of the chroma (C *) of the mixed light, and the change characteristic of the lightness (L *) of the mixed light when it changes by the relationship of 0.20 micrometer.

FIG. 7 is a graph showing the relationship between the thickness tR of the red filter, the thickness tG of the green filter, and the thickness tB of the blue filter, where tR = 1.0.
μm, tG = 0.9 μm, tB = 1.2 μm,
The red filter area sR, the green filter area sG, and the blue filter area sB are calculated as sG = sR-30%, sB =
The figure which shows the change characteristic of the color gamut, the change characteristic of the chroma (C *) of the mixed light, and the change characteristic of the lightness (L *) of the mixed light when it changes by the relationship of sR-15%.

FIG. 8 is a view showing a spectral distribution characteristic of light emitted from the liquid crystal display element.

FIG. 9: 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. 10 is a diagram showing a change in transmittance due to a reduction in the thickness of a color filter.

[Explanation of symbols]

 1, 2, substrate 3, pixel electrode 4, TFT (active element) 14R, 14G, 14B, color filter 17, counter electrode 21, 22, polarizing plate 23, reflector A, pixel area a, filter corresponding area b, non Colored light emission area c: Bright display area

Claims (8)

[Claims] 1. A plurality of first electrodes provided on one of inner surfaces of a pair of front and rear substrates opposed to each other with a liquid crystal layer interposed therebetween, and the plurality of first electrodes provided on the other inner surface. At least one region forming a plurality of pixel regions opposite to
Two second electrodes and three colored films provided on the inner surface of one of the substrates so as to correspond to the respective pixel regions and having different transmission wavelength bands. The area is the color coordinate of the colored light transmitted through the colored film of the first color on the color system, and
The area of the color range surrounded by a triangle connecting the color coordinates of the colored light transmitted through the colored film of the color and the color coordinates of the colored light transmitted through the third colored film is set to a value that is almost maximal. A liquid crystal display device characterized in that: 2. The liquid crystal display device according to claim 1, wherein said three colored films are red, green and blue color filters. 3. The color coordinates of the red light transmitted through the red filter, the color coordinates of the green light transmitted through the green filter, and the color coordinates of the blue light transmitted through the blue filter, respectively.
The area of a color range defined by an E1976L * a * b * color system and surrounded by a triangle connecting the three color coordinates on the a * b * plane is 750 or more. 3. The liquid crystal display device according to item 1. 4. The mixed light of red light, green light and blue light has a chroma (C *) defined by CIE1976L * a * b * color system of 1.5 or less. The liquid crystal display device according to claim 3, wherein 5. The thickness tR of the red filter, the thickness tG of the green filter, and the thickness tB of the blue filter are tG
<TR <tB, and the area s of the red filter
The liquid crystal display device according to claim 2, wherein R, the area sG of the green filter, and the area sB of the blue filter have a relation of sR>sB> sG. 6. The red, green and blue color filters
At least the area sG of the green filter and the area sB of the blue filter are smaller than the area of the pixel region, and a region of the pixel region that does not correspond to the color filter is an emission region of non-colored light. The liquid crystal display device according to claim 5, wherein 7. A red filter having a thickness tR of 0.9 to 0.9.
1.2 μm, green film thickness tG of 0.8 to 1.1
μm, the thickness tB of the blue filter is 1.1 to 1.4 μm,
The area sR of the red filter is 9 times the area of the pixel region.
0 to 95%, the area sG of the green filter is 60 to 65% of the area of the pixel region, and the area sB of the blue filter.
6. The liquid crystal display device according to claim 5, wherein the area is 75 to 80% of the area of the pixel region. 8. The liquid crystal display device according to claim 1, further comprising a reflection member on a rear surface side.