JP2009093022A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device, improving transmittance and displaying an image of a good display quality. <P>SOLUTION: This liquid crystal display device, in which a liquid crystal layer is held between a pair of substrates, includes: a display area having a blue pixel PXB and a green pixel PXG which display different colors; a pixel electrode EP disposed in each color pixel; and a counter electrode ET disposed on the same substrate as the pixel electrode EP opposite to the pixel electrode EP, wherein a cell gap db in the blue pixel PXB is smaller than a cell gap dg in the green pixel. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device, and more particularly to a lateral electric field drive mode liquid crystal display device having a structure in which a pixel electrode and a counter electrode are provided on one substrate constituting a liquid crystal display panel.

2. Description of the Related Art In recent years, flat display devices have been actively developed. In particular, liquid crystal display devices have attracted particular attention because of their advantages such as light weight, thinness, and low power consumption. In particular, an active matrix type liquid crystal display device in which a switching element is incorporated in each pixel has a structure using a lateral electric field (including a fringe electric field) such as an IPS (In-Plane Switching) mode or an FFS (Fringe field Switching) mode. Attention has been paid. (For example, see Patent Document 1 and Patent Document 2.)
Such a liquid crystal display device in a lateral electric field drive mode includes pixel electrodes and a counter electrode facing each other on the array substrate, and forms a lateral electric field substantially parallel to the main surface of the array substrate to switch liquid crystal molecules. Further, polarizing plates are arranged on the outer surfaces of the array substrate and the counter substrate so that the deflection axis directions are orthogonal to each other. With such a polarizing plate arrangement, for example, a black screen is displayed when no voltage is applied, and a white screen is displayed by gradually increasing the transmittance (modulation factor) by applying a voltage corresponding to the video signal to the pixel electrode. To do. In such a liquid crystal display device, since the liquid crystal molecules rotate in a plane substantially parallel to the main surface of the substrate, the polarization state does not greatly affect the incident direction of transmitted light, so the viewing angle dependency is small and a wide field of view. There is a feature of having angular characteristics.
JP 2005-107535 A JP 2006-139295 A

  Such a horizontal electric field drive mode liquid crystal display device has lower transmittance than a liquid crystal display device of ECB mode or TN mode. For this reason, it is necessary to design a cell that improves the transmittance and suppresses coloring when a white screen is displayed.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a liquid crystal display device capable of improving the transmittance and displaying an image with good display quality.

A liquid crystal display device according to a first aspect of the present invention provides:
A liquid crystal display device having a liquid crystal layer held between a pair of substrates,
A display area comprising first and second color pixels for displaying different colors;
Pixel electrodes respectively disposed on the first color pixel and the second color pixel;
A counter electrode disposed on the same substrate as the pixel electrode and facing the pixel electrode;
An alignment film disposed in contact with the liquid crystal layer and rubbed so as to regulate the alignment of liquid crystal molecules contained in the liquid crystal layer,
The first color pixel is a color pixel that displays a color having a shorter wavelength than the second color pixel,
The cell gap in the first color pixel is smaller than the cell gap in the second color pixel.

A liquid crystal display device according to a second aspect of the present invention provides:
A liquid crystal display device having a liquid crystal layer held between a pair of substrates,
A display area with red, green and blue color pixels;
A pixel electrode disposed for each of the color pixels;
A counter electrode disposed on the same substrate as the pixel electrode and facing the pixel electrode;
An alignment film disposed in contact with the liquid crystal layer and rubbed so as to regulate the alignment of liquid crystal molecules contained in the liquid crystal layer,
The cell gap in the blue pixel is smaller than the cell gap in the green pixel.

  According to the present invention, it is possible to provide a liquid crystal display device capable of improving the transmittance and displaying an image with good display quality.

  A liquid crystal display device according to an embodiment of the present invention will be described below with reference to the drawings. Here, an FFS mode liquid crystal display device will be described as an example of a liquid crystal mode in which a pixel electrode and a counter electrode are provided on one substrate and liquid crystal molecules are switched using a lateral electric field formed therebetween.

  As shown in FIGS. 1 to 3, the liquid crystal display device is an active matrix type liquid crystal display device and includes a liquid crystal display panel LPN. The liquid crystal display panel LPN includes an array substrate (first substrate) AR, a counter substrate (second substrate) CT disposed opposite to the array substrate AR, and a space between the array substrate AR and the counter substrate CT. And a liquid crystal layer LQ held in the liquid crystal layer LQ. Such a liquid crystal display device includes a display area DSP for displaying an image. The display area DSP is composed of a plurality of pixels PX arranged in an mxn matrix.

  The array substrate AR is formed using an insulating substrate 20 having optical transparency such as a glass plate or a quartz plate. In other words, the array substrate AR includes m × n pixel electrodes EP arranged for each pixel and n scanning lines Y (Y1 to Yn) extending in the row direction H of each pixel PX in the display area DSP. ) M signal lines X (X1 to Xm) each extending in the column direction V of each pixel PX, and m × arranged in a region including the intersection of the scanning line Y and the signal line X in each pixel PX. There are provided n switching elements W, a counter electrode ET disposed opposite to the pixel electrode EP via the interlayer insulating film IL, and the like.

  The array substrate AR is further connected to at least a part of the scanning line driver YD connected to the n scanning lines Y and to the m signal lines X in the driving circuit area DCT around the display area DSP. And at least a part of the signal line driver XD. The scanning line driver YD sequentially supplies scanning signals (driving signals) to the n scanning lines Y based on control by the controller CNT. Further, the signal line driver XD supplies video signals (drive signals) to the m signal lines X at the timing when the switching elements W in each row are turned on by the scanning signal based on the control by the controller CNT. Thereby, the pixel electrode EP of each row is set to a pixel potential corresponding to the video signal supplied via the corresponding switching element W.

  Each switching element W is configured by, for example, a thin film transistor. The semiconductor layer SC of the switching element W can be formed of, for example, polysilicon or amorphous silicon. The gate electrode WG of the switching element W is connected to the scanning line Y (or formed integrally with the scanning line Y). The source electrode WS of the switching element W is connected to the signal line X (or formed integrally with the signal line X) and is in contact with the source region of the semiconductor layer SC. The drain electrode WD of the switching element W is connected to the pixel electrode EP through the contact hole CH and is in contact with the drain region of the semiconductor layer SC.

  For example, the counter electrode ET is arranged in an island shape in each pixel PX, and is electrically connected to a common wiring COM having a common potential. The counter electrode ET is covered with an interlayer insulating film IL. The pixel electrode EP is disposed on the interlayer insulating film IL so as to face the counter electrode ET. The pixel electrode EP is provided with a plurality of slits SL facing the counter electrode ET. The pixel electrode EP and the counter electrode ET are formed of a light-transmitting conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO). An alignment film 22 is disposed on the surface of the array substrate AR that contacts the liquid crystal layer LQ.

  On the other hand, the counter substrate CT is formed using an insulating substrate 30 having optical transparency such as a glass plate or a quartz plate. In particular, in a color display type liquid crystal display device, as shown in FIG. 3, the counter substrate CT has a black matrix 32 that partitions each pixel PX on the inner surface of the insulating substrate 30, that is, the surface facing the liquid crystal layer LQ. A color filter layer 34 disposed in each pixel surrounded by the black matrix 32 is provided. Further, the counter substrate CT further includes a shield electrode for reducing the influence of the external electric field, an overcoat layer disposed with a relatively thick film thickness so as to flatten the unevenness of the surface of the color filter layer 34, and the like. It may be provided.

  The black matrix 32 is arranged on the insulating substrate 30 so as to face the scanning lines Y and the signal lines X provided on the array substrate AR, and further the wiring portions such as the switching elements W. The color filter layer 34 is disposed on the insulating substrate 30 and is formed of colored resins that are respectively colored in a plurality of different colors, for example, three primary colors such as red, blue, and green. The red colored resin, the blue colored resin, and the green colored resin are disposed corresponding to the red pixel, the blue pixel, and the green pixel, respectively. An alignment film 36 is disposed on the surface of the counter substrate CT that contacts the liquid crystal layer LQ.

  When such a counter substrate CT and the array substrate AR as described above are arranged so that the alignment film 22 and the alignment film 36 face each other, a predetermined gap is formed by a spacer (not shown) arranged between them. It is formed. The liquid crystal layer LQ is composed of a liquid crystal composition including liquid crystal molecules LM sealed in a gap formed between the alignment film 22 of the array substrate AR and the alignment film 36 of the counter substrate CT.

  The liquid crystal molecules LM are aligned by the regulation force by the alignment film 22 and the alignment film 36. That is, no potential difference is formed between the potential of the pixel electrode EP and the potential of the counter electrode ET (that is, no electric field is formed between the pixel electrode EP and the counter electrode ET). The LM is oriented such that its long axis D is oriented in a direction parallel to the rubbing direction of the orientation film 22 and the orientation film 36.

  The liquid crystal display device includes an optical element OD1 provided on one outer surface of the liquid crystal display panel LPN (that is, the outer surface opposite to the surface in contact with the liquid crystal layer LQ of the array substrate AR), and the liquid crystal display panel LPN. The optical element OD2 is provided on the other outer surface (that is, the outer surface opposite to the surface in contact with the liquid crystal layer LQ of the counter substrate CT). These optical elements OD1 and OD2 include a polarizing plate, for example, to realize a normally black mode in which the transmittance of the liquid crystal display panel LPN is lowest (that is, a black screen is displayed) when there is no electric field.

  Further, the liquid crystal display device includes a backlight unit BL disposed on the array substrate AR side with respect to the liquid crystal display panel LPN.

  In such a liquid crystal display device, as shown in FIG. 2, when a potential difference is formed between the potential of the pixel electrode EP and the potential of the counter electrode ET (that is, the pixel electrode EP has a potential different from the common potential). When a voltage is applied), an electric field E is formed between the pixel electrode EP and the counter electrode ET. At this time, the liquid crystal molecules LM are driven so that the major axis D is aligned in the direction parallel to the electric field E from the rubbing direction. As described above, when the orientation of the major axis D of the liquid crystal molecules LM changes from the rubbing direction, the modulation factor for the light transmitted through the liquid crystal layer LQ changes. For this reason, part of the backlight light transmitted from the backlight unit BL through the liquid crystal display panel LPN is transmitted through the second optical element OD2 and displays a white screen. That is, the transmittance (modulation factor) of the liquid crystal display panel LPN changes depending on the magnitude of the electric field E. In the liquid crystal mode using the horizontal electric field, the backlight is selectively transmitted in this way, and an image is displayed.

  In particular, in this embodiment, the slit SL formed in the pixel electrode EP extends substantially along the row direction H and has an acute angle with respect to the row direction H as shown in FIG. It is formed to intersect. The major axis L of the slit SL is inclined so as to form an angle θ of about 5 ° to 10 ° with respect to the rubbing direction (here, a direction parallel to the row direction H). The plurality of slits SL are arranged in the column direction V. The plurality of slits SL are arranged in parallel to each other.

  By the way, in the liquid crystal display device, the transmittance T of the liquid crystal display panel LPN changes depending on the retardation δ of the liquid crystal layer LQ. That is, when the refractive index anisotropy in the liquid crystal layer LQ is Δn and the thickness of the liquid crystal layer LQ (that is, the cell gap) is d, the retardation δ is given by δ = Δn · d. For example, the transmittance T of the liquid crystal display panel LPN at a wavelength of 550 nm of the green pixel most related to the luminance of the liquid crystal display device varies depending on the retardation δ as shown in FIG. The example shown in FIG. 4 corresponds to the case where Δn of the liquid crystal layer LQ is 0.1, and it can be seen that the transmittance T changes depending on the cell gap d. In this simulation, the angle θ formed by the long axis L of the slit SL and the rubbing direction was set to 7 °.

  From the results shown in FIG. 4, for light with a wavelength of 550 nm, the retardation δ of the liquid crystal layer LQ is set to 420 nm (that is, when Δn = 0.1, the cell gap d is set to 4.2 μm). It can be seen that the transmittance T of the liquid crystal display panel LPN is maximum (about 84%).

  Based on such a result, when the cell gap d is set so that the maximum transmittance can be obtained with respect to light having a wavelength of 550 nm, the brightest liquid crystal display panel LPN can be obtained from the viewpoint of visual sensitivity. The maximum transmittance is not always obtained for light having a wavelength, that is, a blue pixel wavelength of 460 nm and a red pixel wavelength of 620 nm. For this reason, in the liquid crystal display panel LPN in which the retardation δ is set to 420 nm, the transmittance T varies depending on the wavelength as shown in FIG.

  With such a cell design (Δn = 0.1, d = 4.2 μm, θ = 7 °), a transmittance (about 84%) is obtained at the red wavelength (620 nm) which is substantially the same as the green wavelength (550 nm). On the other hand, at the blue wavelength (460 nm), the transmittance (about 75%) is extremely low compared to the green wavelength and the red wavelength. For this reason, when displaying a white screen, chromaticity will shift to the direction of yellowishness-redness. Therefore, improvement in display quality is desired without sacrificing transmittance.

  Therefore, the inventor first examined the relationship of the transmittance T of the liquid crystal display panel LPN to the retardation δ for each color pixel. In the simulation described below, the angle θ formed between the major axis L of the slit SL and the rubbing direction was set to 7 °, and Δn was set to a constant value (0.1).

  The transmittance T of the liquid crystal display panel LPN at the wavelength of 460 nm of the blue pixel changes depending on the retardation δ, as indicated by “B” in FIG. That is, for light with a wavelength of 460 nm, it was found that a relatively high transmittance can be obtained by setting the retardation δ to a range larger than 340 nm and smaller than 380 nm. In particular, the maximum transmittance (about 81%) of the liquid crystal display panel LPN is obtained by setting the retardation δ to about 360 nm (that is, when Δn = 0.1, the cell gap d is set to 3.6 μm). I found out that

  The transmittance T of the liquid crystal display panel LPN at a wavelength of 550 nm of the green pixel changes depending on the retardation δ, as indicated by “G” in FIG. That is, for light with a wavelength of 550 nm, it was found that relatively high transmittance can be obtained by setting the retardation δ to a range larger than 400 nm and smaller than 440 nm. In particular, the maximum transmittance (about 84%) of the liquid crystal display panel LPN is obtained by setting the retardation δ to about 420 nm (that is, when Δn = 0.1, the cell gap d is set to 4.2 μm). I found out that

  The transmittance T of the liquid crystal display panel LPN at a wavelength of 620 nm of the red pixel changes depending on the retardation δ, as indicated by “R” in FIG. That is, for light with a wavelength of 620 nm, it was found that a relatively high transmittance can be obtained by setting the retardation δ to a range larger than 460 nm and smaller than 480 nm. In particular, the maximum transmittance (about 86%) of the liquid crystal display panel LPN is obtained by setting the retardation δ to about 470 nm (that is, when Δn = 0.1, the cell gap d is set to 4.7 μm). I found out that However, as described above, in view of the fact that the chromaticity shifts in the direction of yellow to red when a white screen is displayed, for red pixels, the transmittance of green pixels is significantly higher. Desirably not.

  The relationship of the transmittance T of the liquid crystal display panel LPN with respect to the retardation δ for each color pixel described here is an example, but Δn is another constant value (a value other than 0.1), and the cell gap d is a variable. The same tendency is confirmed when the cell gap d is a constant value and Δn is a variable. Although the maximum transmittance varies slightly, the range of the retardation δ for obtaining a relatively high transmittance T Were almost identical. Further, it was confirmed that the relationship of the transmittance T of the liquid crystal display panel LPN to the retardation δ has the same tendency when the angle θ formed is set to 4 °, 10 °, and 15 °, respectively. That is, although FIG. 6 is an example, the simulation result is sufficient to define the optimum range of the retardation δ for obtaining a high transmittance T for each color pixel.

  Based on the result shown in FIG. 6, when the transmittance T of the liquid crystal display panel LPN is compared for each color pixel, it can be seen that the maximum transmittance is obtained with a smaller retardation δ for a color pixel that displays a short wavelength color. Further, when the maximum transmittance of the liquid crystal display panel LPN is compared for each color pixel, it can be seen that the maximum transmittance of the liquid crystal display panel LPN is smaller as the color pixel displays a short wavelength color.

  For this reason, the inventor considers the balance of the transmittance in each color pixel in order to improve the tint when displaying a white screen without sacrificing the transmittance. I found that it was necessary to select the conditions. That is, based on the result shown in FIG. 6, for the first color pixel that displays a short wavelength color (blue pixel in this embodiment), the second color pixel that displays a longer wavelength color than the first color pixel. A condition for retardation δ smaller than (a green pixel in this embodiment) is selected (that is, since the liquid crystal layer LQ is common to the first color pixel and the second color pixel, Δn is the same, and the first color For the pixel, a condition in which the cell gap d is smaller than that of the second color pixel is selected). That is, when the cell gap in the first color pixel is d1 and the cell gap in the second color pixel is d2, the cell design is performed so as to satisfy the relationship d1 <d2.

  Thereby, the transmittance T of the liquid crystal display panel LPN in the first color pixel can be improved. In addition, by improving the transmittance T of short-wavelength light, it is possible to suppress a shift in chromaticity in the direction of yellow to red when a white screen is displayed.

  In particular, based on the results shown in FIG. 6, since the liquid crystal layer LQ is common to the blue pixel and the green pixel, Δn is the same, the cell gap of the liquid crystal layer LQ in the blue pixel is db, and the liquid crystal in the green pixel is When the cell gap of the layer LQ is dg, it is desirable to design the cell so as to satisfy the relationship db <dg.

At this time, the retardation δb = Δn · db in the blue pixel and the retardation δg = Δn · dg in the green pixel are respectively
340 nm <δb <380 nm and 400 nm <δg <440 nm
It is desirable to set the range. In other words, since Δn is the same for the blue pixel and the green pixel, it is desirable to set the cell gap for each color pixel so that the retardation in the above range is obtained.

  According to the blue pixel and the green pixel respectively set in such a range of retardation, a high transmittance T (substantially maximum transmittance) can be obtained. For this reason, it is possible to suppress the coloring of the white screen while improving the transmittance of the liquid crystal display panel LPN.

  On the other hand, as described above, it is desirable that the red pixel does not significantly exceed the transmittance of the green pixel. Based on the results shown in FIG. 6, it is understood that when the substantially maximum transmittance is obtained in the green pixel, that is, when the retardation δ is about 420 nm, the red pixel can obtain the same transmittance as that of the green pixel. ing. In the red pixel, when the retardation δ is 420 nm or less, the transmittance is lower than that of the green pixel.

  For this reason, in the red pixel, it is desirable to set the cell gap so that the retardation equal to or less than the retardation δg in the green pixel can be obtained. That is, it is desirable to design the cell so that the relationship dr ≦ dg is satisfied, where dr is the cell gap of the liquid crystal layer LQ in the red pixel.

  With the above-described configuration, it is possible to suppress the coloring without sacrificing the transmittance, and it is possible to display an image with good display quality.

"Example"
As shown in FIG. 7, the liquid crystal display panel LPN according to the embodiment includes a blue pixel PXB, a green pixel PXG, and a red pixel PXR. Each color pixel includes a pixel electrode EP, a counter electrode ET that is disposed on the same substrate as the pixel electrode EP, and is opposed to the pixel electrode EP via an interlayer insulating film IL. The pixel electrode EP has a slit SL, and an angle θ between the major axis of the slit SL and the rubbing direction is set to 7 °.

  The liquid crystal layer LQ is formed of a material having a refractive index anisotropy Δn of 0.1. The cell gap of each color pixel corresponds to the thickness of the liquid crystal layer LQ between the alignment film 22 on the array substrate AR side and the alignment film 36 on the counter substrate CT side.

  The cell gap db of the blue pixel PXB is set to 3.6 μm. That is, in the blue pixel PXB, the retardation δb is set to 360 nm. The cell gap dg of the green pixel PXG is set to 4.2 μm. That is, in the green pixel PXG, the retardation δg is set to 420 nm. The cell gap dr of the red pixel PXR is set to 4.2 μm. That is, in the red pixel PXR, the retardation δr is set to 420 nm.

  Such a cell gap is controllable by the thickness of the color filter layer arrange | positioned for every color pixel, for example. That is, the blue pixel PXB includes a blue colored resin 34B, and similarly, the green pixel PXG and the red pixel PXR include a green colored resin 34G and a red colored resin 34R, respectively. The blue colored resin 34B is formed thicker than the green colored resin 34G and the red colored resin 34R, and the green colored resin 34G and the red colored resin 34R are formed to have the same thickness.

  In such an embodiment, when a white screen is displayed, x = 0.3345 and y = 0.3414 in the xy chromaticity diagram shown in FIG. 8, which can be close to the reference white chromaticity coordinates. It was. That is, it was confirmed that it is possible to suppress the coloring of the white screen and display an image with good display quality.

《Comparative example》
The liquid crystal display panel according to the comparative example has the same configuration as that of the example shown in FIG. 7 except that the cell gaps of all the color pixels are set to 4.2 μm. In such a comparative example, when a white screen is displayed, in the xy chromaticity diagram shown in FIG. 8, x = 0.3420 and y = 0.3480, and the white screen is more colored than the embodiment. Was confirmed.

  As described above, according to the liquid crystal display device of this embodiment, it is possible to improve the transmittance and display an image with high display quality, particularly a high luminance image when displaying a white screen. Is possible.

  In addition, this invention is not limited to each said embodiment itself, In the stage of the implementation, a component can be deform | transformed and embodied in the range which does not deviate from the summary. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine the component covering different embodiment suitably.

  In the embodiment, the example in which the thickness of the cell gap is controlled by the thickness of the color filter layer has been described. However, the thickness may be controlled by the thickness of one or more other layers. In the embodiment, the example in which the color filter layer is disposed on the counter substrate side has been described. However, the color filter layer may be disposed on the array substrate side.

FIG. 1 is a diagram schematically showing a configuration of a liquid crystal mode liquid crystal display device using a lateral electric field according to an embodiment of the present invention. FIG. 2 is a plan view schematically showing the structure of the pixel electrode and the counter electrode for one pixel in the present embodiment. FIG. 3 schematically shows a cross-sectional structure of the liquid crystal display panel when the array substrate shown in FIG. 2 is cut along the line III-III. FIG. 4 is a diagram for explaining the retardation dependency of the transmittance of the liquid crystal display panel at a wavelength of 550 nm of the green pixel. FIG. 5 is a diagram for explaining the wavelength dependence of the transmittance of the liquid crystal display panel when the retardation is set to 420 nm. FIG. 6 is a diagram showing the relationship of the transmittance of the liquid crystal display panel with respect to retardation for each color pixel. FIG. 7 is a cross-sectional view schematically showing the configuration of the liquid crystal display panel according to the example. FIG. 8 is a diagram showing chromaticity coordinates when a white screen is displayed for each of the liquid crystal display panels of the example and the comparative example shown in FIG.

Explanation of symbols

LPN ... Liquid crystal display panel AR ... Array substrate CT ... Counter substrate LQ ... Liquid crystal layer PX ... Pixel EP ... Pixel electrode ET ... Counter electrode COM ... Common wiring SL ... Slit 34 ... Color filter layer

Claims (5)

A liquid crystal display device having a liquid crystal layer held between a pair of substrates,
A display area comprising first and second color pixels for displaying different colors;
Pixel electrodes respectively disposed on the first color pixel and the second color pixel;
A counter electrode disposed on the same substrate as the pixel electrode and facing the pixel electrode;
An alignment film disposed in contact with the liquid crystal layer and rubbed so as to regulate the alignment of liquid crystal molecules contained in the liquid crystal layer,
The first color pixel is a color pixel that displays a color having a shorter wavelength than the second color pixel,
The liquid crystal display device, wherein a cell gap in the first color pixel is smaller than a cell gap in the second color pixel. The pixel electrode has a slit formed to be inclined with respect to the rubbing direction of the alignment film,
The liquid crystal display device according to claim 1, wherein the counter electrode is opposed to the pixel electrode through an interlayer insulating film. A liquid crystal display device having a liquid crystal layer held between a pair of substrates,
A display area with red, green and blue color pixels;
A pixel electrode disposed for each of the color pixels;
A counter electrode disposed on the same substrate as the pixel electrode and facing the pixel electrode;
An alignment film disposed in contact with the liquid crystal layer and rubbed so as to regulate the alignment of liquid crystal molecules contained in the liquid crystal layer,
A liquid crystal display device, wherein a cell gap in the blue pixel is smaller than a cell gap in the green pixel. When the refractive index anisotropy in the liquid crystal layer is Δn, the cell gap in the blue pixel is db, and the cell gap in the green pixel is dg,
The retardation δb = Δn · db of the liquid crystal layer in the blue pixel and the retardation δg = Δn · dg of the liquid crystal layer in the green pixel are respectively
340 nm <δb <380 nm and 400 nm <δg <440 nm
The liquid crystal display device according to claim 3, wherein the liquid crystal display device is set within a range.   The liquid crystal display device according to claim 3, wherein a cell gap in the red pixel is equal to or less than the cell gap in the green pixel.

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