JP2007058046A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device capable of achieving thinning and reduction in cost and improving the display quality of reflective display. <P>SOLUTION: The liquid crystal display device is provided with a liquid crystal display panel LPN, having a liquid crystal layer held between a pair disposed opposite each other, an optical element POL2 provided on the outer surface on the side of an opposite substrate CT of the liquid crystal panel LPN and including a single polarizer and a single retardation plate, and a color filter layer 34 provided on the inner surface of the liquid crystal panel LPN corresponding to each pixel. The color filter layer 34 includes a first colored resin CF1 disposed on a reflective part PR of a red pixel PXR, a second colored resin CF2 disposed on a reflective part PR of a green pixel PXG, a third colored resin CF3 disposed on a reflective part PR of a blue pixel PXB, and a fourth colored resin CF4 disposed commonly on the reflective parts of the red pixel, the green pixel, and the blue pixel and having a transmittance peak at a green wavelength. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device including a reflection unit that displays an image by reflecting at least external light.

  A transflective liquid crystal display device including a reflective portion and a transmissive portion is a transmissive liquid crystal display device that displays an image by selectively transmitting backlight light using a transmissive portion in a pixel in a dark place. In a bright place, it functions as a reflective liquid crystal display device that displays an image by selectively reflecting external light using a reflection portion in a pixel. Thereby, there exists a merit which can reduce power consumption significantly.

  A color display type transflective liquid crystal display device includes a color filter layer corresponding to each pixel. That is, such a liquid crystal display device includes a red resin in which the transmitted light exhibits red in the reflective portion and the transmissive portion of the red pixel, and a green resin in which the transmitted light exhibits green in the reflective portion and the transmissive portion of the green pixel, The blue pixel is provided with a blue resin whose transmitted light exhibits a blue color at the reflection portion and the transmission portion of the blue pixel.

In particular, when an image is displayed using the reflection portion, the light passes through the color filter layer when external light is incident on the liquid crystal display panel from the outside and when the light is emitted from the liquid crystal display panel due to reflection by the reflection portion. . For this reason, the color of the image displayed using a reflection part becomes dark (or the transmittance | permeability becomes low). Therefore, it has been proposed to provide an opening in the color filter layer and to embed a substantially colorless transparent resin in that portion. However, in such a configuration, when white is displayed on the reflecting portion, yellow color is exhibited. Therefore, for the purpose of improvement, there is a technique in which a blue resin is embedded in the openings of the red pixel and the green pixel instead of the transparent resin. It has been proposed (see, for example, Patent Document 1).
JP 2004-191646 A

  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 realizing a reduction in thickness and cost and improving the display quality of reflective display. There is.

  A liquid crystal display device according to an aspect of the present invention includes a liquid crystal display panel in which a liquid crystal layer is held between a pair of substrates disposed to face each other, and a reflective portion of a plurality of pixels arranged in a matrix included in the liquid crystal display panel And provided on one outer surface of the liquid crystal display panel corresponding to an incident surface of light incident on the reflecting portion, and disposed between a single polarizing plate and the polarizing plate and the liquid crystal display panel. An optical element that includes a single retardation plate that converts linearly polarized light that has passed through the polarizing plate into elliptically polarized light, and an inner surface of the liquid crystal display panel that corresponds to each pixel, and is disposed on the reflective portion of the red pixel. And a color filter layer comprising a first colored resin, a second colored resin disposed in the reflective portion of the green pixel, and a third colored resin disposed in the reflective portion of the blue pixel, and a red pixel and a green pixel And the blue pixel And having a disposed in common to morphism portion fourth colored resin having a peak of transmittance in a green wavelength.

  According to the present invention, it is possible to provide a liquid crystal display device capable of realizing a reduction in thickness and cost and improving the display quality of reflective display.

  A liquid crystal display device according to an embodiment of the present invention will be described below with reference to the drawings. Here, as a liquid crystal display device, a reflection unit that displays an image by selectively reflecting external light within one pixel and a transmission unit that displays an image by selectively transmitting backlight light are provided. An example of a transflective liquid crystal display device having a reflective portion is provided in the display region, such as a partially reflective liquid crystal display device in which a reflective portion is provided in a portion of the display region. If there is, the same effect can be obtained based on the embodiment described below.

  As shown in FIGS. 1 and 2, the liquid crystal display device is an active matrix type color 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 arranged opposite to the array substrate AR, and between the array substrate AR and the counter substrate CT. The liquid crystal layer LQ that is held is provided.

  In addition, the liquid crystal display device includes a first optical element POL1 provided on one outer surface of the liquid crystal display panel LPN (that is, the outer surface opposite to the surface holding the liquid crystal layer LQ of the array substrate AR), and the liquid crystal display panel. A second optical element POL2 provided on the other outer surface of the LPN (that is, the outer surface opposite to the surface holding the liquid crystal layer LQ of the counter substrate CT; corresponding to the incident surface of light incident on the reflecting portion) is provided. . Further, the liquid crystal display device includes a backlight unit BL that illuminates the liquid crystal display panel LPN from the first optical element POL1 side.

  The liquid crystal display panel LPN includes a display area DSP that displays an image. The display area DSP is composed of a plurality of pixels PX arranged in an mxn matrix. Each pixel PX has a reflection part PR that displays an image by selectively reflecting external light and a transmission part PT that displays an image by selectively transmitting backlight light from the backlight unit BL. is doing.

  The array substrate AR is formed using an insulating substrate 10 having optical transparency such as a glass plate. That is, the array substrate AR includes m × n pixel electrodes EP arranged for each pixel in the display region DSP, and n scanning lines Y (Y1 to Y1) respectively formed along the rows of the pixel electrodes EP. Yn), m signal lines X (X1 to Xm) formed along the columns of the pixel electrodes EP, m × n arranged for each pixel in the vicinity of the intersection position of the scanning line Y and the signal line X, respectively. Switching element W and the like.

  The n scanning lines Y are connected to a scanning line driver YD disposed on the array substrate AR or the external circuit substrate. The m signal lines X are connected to a signal line driver XD arranged on the array substrate AR or the external circuit board.

  In the array substrate AR, each switching element W is, for example, an N-channel thin film transistor, and has a polysilicon semiconductor layer 12 disposed on the insulating substrate 10. The polysilicon semiconductor layer 12 has a source region 12S and a drain region 12D on both sides of the channel region 12C. The polysilicon semiconductor layer 12 is covered with a gate insulating film 14.

  The gate electrode WG of the thin film transistor W is connected to the scanning line Y (or formed integrally with the scanning line Y). Both the gate electrode WG and the scanning line Y are formed on the gate insulating film 14. The gate electrode WG and the scanning line Y are covered with an interlayer insulating film 16.

  The source electrode WS and the drain electrode WD of the thin film transistor W are disposed on both sides of the gate electrode WG on the interlayer insulating film 16. The source electrode WS is connected to the signal line X (or formed integrally with the signal line X) and is in contact with the source region 12S of the polysilicon semiconductor layer 12. The drain electrode WD is connected to the pixel electrode EP and is in contact with the drain region 12D of the polysilicon semiconductor layer 12. The source electrode WS, the drain electrode WD, and the signal line X are covered with the organic insulating film 18.

  The pixel electrode EP includes a reflective electrode EPR provided corresponding to the reflective part PR and a transmissive electrode EPT provided corresponding to the transmissive part PT. The reflective electrode EPR is disposed on the organic insulating film 18 and is electrically connected to the drain electrode WD. The reflective electrode EPR is formed of a metal film having light reflectivity such as aluminum. The transmissive electrode EPT is disposed on the interlayer insulating film 16 and is electrically connected to the reflective electrode EPR. The transmissive electrode EPT is formed of a light-transmissive metal film such as indium tin oxide (ITO). The pixel electrodes EP corresponding to all the pixels PX are covered with the alignment film 20.

  On the other hand, the counter substrate CT is formed using an insulating substrate 30 having optical transparency such as a glass plate. That is, the counter substrate CT includes a counter electrode ET and the like in the display area DSP. The counter electrode ET is disposed so as to face the pixel electrode EP corresponding to all the pixels PX. The counter electrode ET is formed of a light-transmitting metal film such as indium tin oxide (ITO). The counter electrode ET is covered with an alignment film 36.

  When the counter substrate CT and the array substrate AR as described above are arranged so that the alignment films 20 and 36 face each other, a predetermined gap is formed by a spacer (not shown) arranged between the two. The That is, a gap that is approximately half of the transmission part PT is formed in the reflection part PR.

  The liquid crystal layer LQ is composed of a liquid crystal composition including liquid crystal molecules sealed in a gap formed between the alignment film 20 of the array substrate AR and the alignment film 36 of the counter substrate CT.

  The first optical element POL1 and the second optical element POL2 control the polarization state of the light that has passed through them. In other words, the first optical element POL1 controls the polarization state of the light passing through the liquid crystal layer LQ so that the light having the elliptical polarization state is incident on the liquid crystal layer LQ. Accordingly, the polarization state of the backlight light incident on the first optical element POL1 is converted into elliptically polarized light when passing through the first optical element POL1. Thereafter, the backlight light that has passed through the first optical element POL1 is incident on the liquid crystal layer LQ while maintaining the polarization state of elliptically polarized light.

  Similarly, the second optical element POL2 controls the polarization state of light passing through the liquid crystal layer LQ so that light having an elliptical polarization state is incident on the liquid crystal layer LQ. Therefore, the polarization state of the external light incident on the second optical element POL2 is converted into elliptically polarized light when passing through the second optical element POL1. Thereafter, the external light that has passed through the second optical element POL2 is incident on the liquid crystal layer LQ while maintaining the polarization state of elliptically polarized light.

  The first optical element POL1 includes a first polarizing plate 51, and a first retardation plate 52 disposed between the first polarizing plate 51 and the liquid crystal display panel LPN. The second optical element POL2 includes a second polarizing plate 61, and a second retardation plate 62 disposed between the second polarizing plate 61 and the liquid crystal display panel LPN.

  The first polarizing plate 51 and the second polarizing plate 61 have an absorption axis and a transmission axis orthogonal to each other in a plane orthogonal to the traveling direction of light. The first polarizing plate 51 and the second polarizing plate 61 extract light having a vibrating surface in one direction parallel to the transmission axis, that is, light having a linearly polarized light state, from light having a vibrating surface in a random direction. Is.

  The first retardation plate 52 converts the linearly polarized light transmitted through the first polarizing plate 51 into elliptically polarized light. The second retardation plate 62 converts linearly polarized light transmitted through the second polarizing plate 61 into elliptically polarized light.

  That is, the first phase plate 52 and the second phase plate 62 have a slow axis and a fast axis that are orthogonal to each other. In discussing birefringence, the slow axis corresponds to an axis having a relatively large refractive index, and the fast axis corresponds to an axis having a relatively small refractive index. The slow axis coincides with the vibration plane of the extraordinary ray. The fast axis coincides with the plane of vibration of ordinary rays. When the refractive indexes of ordinary ray and extraordinary ray are respectively no and ne, and the thickness of the retardation plate along the traveling direction of each ray is d, the retardation value Δn · d (nm) of the retardation plate is (Ne · d−no · d) (that is, Δn = ne−no).

  The first phase difference plate 52 and the second phase difference plate 62 have a function of giving a phase difference of ¼ wavelength between light of a predetermined wavelength that passes through the fast axis and the slow axis. It is a board. In other words, the first retardation plate 52 is arranged so that its slow axis forms a predetermined angle (acute angle) with respect to the absorption axis (or transmission axis) of the first polarizing plate 51 in the plane. The linearly polarized light transmitted through the first polarizing plate 51 has a function of converting it into elliptically polarized light having a predetermined ellipticity (= amplitude in the minor axis direction / amplitude in the major axis direction). Similarly, the second retardation plate 62 is arranged in the plane so that its slow axis forms a predetermined angle (acute angle) with respect to the absorption axis (or transmission axis) of the second polarizing plate 61. Thus, the linearly polarized light transmitted through the second polarizing plate 61 has a function of converting into elliptically polarized light having a predetermined ellipticity.

  In general, the birefringent material constituting the retardation plate has characteristics in which the refractive index no for ordinary light and the refractive index ne for extraordinary light depend on the wavelength of light. For this reason, the retardation value Δn · d of the phase difference plate depends on the wavelength of light passing therethrough. For this reason, at least two types of retardation plates (1/2 wavelength plate and 1/4 wavelength plate) are used to form circularly polarized light by providing a predetermined retardation in all wavelength ranges used for color display. ) To reduce the wavelength dependence of the retardation value of the retardation plate.

  On the other hand, in this embodiment, the first optical element POL1 is configured by combining the single polarizing plate 51 and the single retardation plate 52, and the single polarizing plate 61 and the single retardation plate 52 are combined. By configuring the second optical element POL2 in combination with the retardation plate 62 and optimizing the angle between the absorption axis of the polarizing plate and the slow axis of the retardation plate, it is substantially constant regardless of the wavelength of the incident light. An elliptically polarized light having an ellipticity of 5 is formed. Here, as the optimization condition, for the first optical element POL1, the acute angle θ formed by the absorption axis of the first polarizing plate 51 and the slow axis of the first retardation plate 52 is 25 degrees or more and 70 degrees. The following range is set. Similarly, for the second optical element POL2, the acute angle θ formed by the absorption axis of the second polarizing plate 61 and the slow axis of the second retardation plate 62 is set in the range of 25 degrees to 70 degrees. Is done.

  Thus, by setting the acute angle formed by the absorption axis of the polarizing plate and the slow axis of the retardation plate to the above-described range, all the wavelength ranges used for color display, for example, the wavelength range of 450 nm to 650 nm. For this light, a polarization state having a predetermined ellipticity can be formed, and elliptically polarized light having a substantially uniform ellipticity can be used. That is, optical characteristics are deteriorated due to the wavelength dependence of the retardation value in a single retardation plate (¼ wavelength plate) without combining a plurality of retardation plates, that is, half-wave plates and quarter-wave plates. Can also be prevented. For this reason, the whole thickness can be made thin compared with the optical element of the structure which laminated | stacked the several phase difference plate. In addition, the entire liquid crystal display device including such an optical element can be thinned. Furthermore, since the configuration of the optical element can be simplified, the cost can be reduced.

  Incidentally, the color display type liquid crystal display device includes a color filter layer 34 provided on the inner surface of the liquid crystal display panel LPN corresponding to each pixel. In the example shown in FIGS. 2 and 3, the color filter layer 34 is provided on the counter substrate CT. The color filter layer 34 is formed of colored resins that are colored in three different primary colors such as red, blue, and green.

  That is, as shown in FIG. 3, the color filter layer 34 is disposed in the first colored resin CF1 disposed in the reflection part PR and the transmission part PT of the red pixel PXR and in the reflection part PR and transmission part PT of the green pixel PXG. And the third colored resin CF3 disposed in the reflective portion PR and the transmissive portion PT of the blue pixel PXB. In FIG. 3, the configuration other than the color filter layer 34 is omitted. The first colored resin CF1 is a red resin whose transmitted light mainly exhibits a red color. The second colored resin CF2 is a green resin whose transmitted light mainly exhibits a green color. The third colored resin CF3 is a blue resin whose transmitted light mainly exhibits a blue color.

  In the above-described color display type liquid crystal display device including the reflection part PR, there is a problem that when an image is displayed using the reflection part PR, particularly when black is displayed, the color is colored red-blue. This is because the second optical element POL2 arranged on the incident surface side of the external light is configured by the single polarizing plate 61 and the single retardation plate 62. That is, the retardation plate 62 has a characteristic that its transmittance depends on the wavelength of light passing therethrough. In particular, the retardation plate 62 applied here has transmittance of light of red wavelength and blue wavelength. It has characteristics that are relatively higher than the transmittance of light of the green wavelength.

  Usually, in an optical element constituted by a single polarizing plate and at least two retardation plates (combination of a single λ / 2 wavelength plate and λ / 4 wavelength plate), the transmission of each retardation plate is performed. It is configured to reduce the wavelength dependence of the rate. In a liquid crystal display panel in which an optical element having such two retardation plates is arranged on the outer surface on the counter substrate side (two retardation plate configuration), the wavelength when black is displayed using the reflection part PR For example, the transmittance with respect to is distributed as indicated by T1 in FIG. 4, and is substantially constant in all wavelength ranges used for color display.

  On the other hand, in this embodiment, in order to achieve the problem of thickness reduction and cost reduction, the optical element is configured by combining a single retardation plate and a single retardation plate ( Single retardation plate configuration). In a liquid crystal display panel in which an optical element having such a single retardation plate is arranged on the outer surface on the counter substrate side, the transmittance with respect to the wavelength when black is displayed using the reflecting portion PR is, for example, FIG. As shown by T2, the distribution is such that the transmittance at the red wavelength and the blue wavelength is relatively higher than the transmittance at the green wavelength. For this reason, black is colored red-blue due to the wavelength dependency of the transmittance of the retardation plate.

  Such a phenomenon also appears when the three primary colors of red, green, and blue are displayed in a single color. For example, in the case of a red single color display, the liquid crystal layer LQ is modulated so as to contribute to display by reflecting external light at the reflection part PR of the red pixel PXR including the first colored resin CF1, and the second colored resin. In the reflection part PR of the green pixel PXG including CF2 and the blue pixel PXB including the third colored resin CF3, the liquid crystal layer LQ is modulated so as to display black. At this time, in the green pixel PXG and the blue pixel PXB, since black is colored red-blue, the resulting red color balance is degraded. Similarly, in the case of green and blue single color display, the color balance is deteriorated due to black coloring.

  For this reason, when an image is displayed using the reflection part PR, the chromaticity obtained by a liquid crystal display panel having a single phase difference plate structure is as shown in FIG. Compared with the chromaticity obtained in (1), the entire color shifts in the red-blue direction. That is, the color balance when displaying a color image using the reflection part PR is likely to be disturbed, and there is a possibility that a desired display quality cannot be obtained.

  Therefore, in this embodiment, the color filter layer 34 includes the fourth colored resin CF4 that is arranged in common corresponding to the reflection part PR of the red pixel PXR, the green pixel PXG, and the blue pixel PXB. . The fourth colored resin CF4 has a transmittance peak at the green wavelength. That is, the fourth colored resin CF4 has a higher transmittance than other wavelengths in the wavelength range of 500 nm to 600 nm, and desirably has a transmittance peak at a wavelength of 550 nm.

  As a matter of course, the transmitted light of the fourth colored resin CF4 is green. For example, as shown in FIG. 6, the fourth colored resin CF4 exhibiting green has a transmittance peak near the green wavelength in its spectral transmittance distribution, and other wavelength ranges (for example, a blue wavelength range of 400 nm to 470 nm, , In the red wavelength range of 600 nm to 700 nm).

  That is, in this embodiment, for the red pixel PXR, only the first colored resin CF1 that exhibits red is disposed in the transmissive part PT, and the fourth colored resin CF4 is provided in the reflective part PR in addition to the first colored resin CF1. Is arranged. Further, for the green pixel PXG, only the second colored resin CF2 exhibiting green is disposed in the transmissive part PT, and the fourth colored resin CF4 is disposed in the reflective part PR in addition to the second colored resin CF2. Further, for the blue pixel PXB, only the third colored resin CF3 exhibiting blue color is disposed in the transmissive portion PT, and the fourth colored resin CF4 is disposed in the reflective portion PR in addition to the third colored resin CF3.

  In short, for the reflection part PR of each color pixel PX (R, G, B), the colored resin CF1, CF2, CF3 of the corresponding color is not disposed on the entire reflection part PR as in the transmission part PT, but is reflected. Arranged in a part of the part PR.

  Thereby, when displaying an image using the reflection part PR, in addition to the red-blue coloring due to the wavelength dependence of the transmittance of the second retardation plate 62 constituting the second optical element POL2, the fourth colored resin With the green coloring by CF4, the shifted chromaticity can be corrected, and the color balance can be improved.

  According to this embodiment, the chromaticity obtained in the liquid crystal display panel when an image is displayed using the reflection part PR by the combination of the optical element having a single retardation plate and the fourth colored resin CF4 is as follows. As shown in FIG. 5, it was possible to approximate the chromaticity obtained with the liquid crystal display panel having a two-phase retardation plate, and it was confirmed that a good color balance could be obtained.

  As described above, according to the above-described embodiment, the liquid crystal display panel includes a liquid crystal display device including at least a reflection portion, and a single polarization is provided on the side corresponding to the incident surface of light incident on the reflection portion. Retardation value in the retardation plate by optimizing the angle between the absorption axis of the polarizing plate and the slow axis of the retardation plate by using the optical element that combines the plate and the single retardation plate. It is possible to prevent the deterioration of the optical characteristics due to the wavelength dependence of the optical element, and it is possible to reduce the thickness and the cost by simplifying the configuration of the optical element.

  In this liquid crystal display device, the fourth colored resin having a transmittance peak at the green wavelength is disposed in addition to the colored resins corresponding to the reflective portions of the red pixel, the green pixel, and the blue pixel, respectively. It is possible to prevent deterioration in display quality of an image displayed using the reflecting portion due to the wavelength dependency of the transmittance of the retardation plate.

  That is, according to this embodiment, it becomes possible to prevent deterioration of display performance due to the wavelength dependence of the retardation value and the wavelength dependence of the transmittance due to the unification of the retardation plates provided in the optical element. Thus, it is possible to reduce the thickness and the cost, and to improve the display quality of the reflective display.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the spirit of the invention in the stage of implementation. In addition, 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 suitably the component covering different embodiment.

  For example, the fourth colored resin CF4 may be formed of the same material as the second colored resin CF2 disposed in the green pixel PXG. In this case, the process is simplified from the process of forming the color filter layer 34 using four types of colored resin materials, and the manufacturing cost can be reduced and the manufacturing yield can be improved.

FIG. 1 schematically shows a configuration of a liquid crystal display device according to an embodiment of the present invention. FIG. 2 is a diagram schematically showing a cross-sectional structure of the liquid crystal display device shown in FIG. FIG. 3 is a diagram schematically showing a configuration of a color filter layer applied to the liquid crystal display panel shown in FIG. FIG. 4 is a diagram for explaining spectral transmittance characteristics in the liquid crystal display panel according to the two-phase retardation plate configuration and the single-phase retardation plate configuration. FIG. 5 is a diagram illustrating a chromaticity characteristic when an image is displayed using a reflecting portion in a two-phase retardation plate configuration, a single-phase retardation plate configuration, and a liquid crystal display panel according to this embodiment. FIG. FIG. 6 is a diagram illustrating an example of a spectral transmittance distribution of a material applicable as the fourth colored resin in the color filter layer illustrated in FIG. 3.

Explanation of symbols

  LPN ... Liquid crystal display panel, AR ... Array substrate, CT ... Counter substrate, LQ ... Liquid crystal layer, BL ... Backlight unit, DSP ... Display region, PX (R, G, B) ... Pixel, PR ... Reflector, PT ... Transmission part, EP ... pixel electrode, Y ... scanning line, X ... signal line, W ... switching element, ET ... counter electrode, POL1 ... first optical element, POL2 ... second optical element, CF1 ... first colored resin, CF2 ... second colored resin, CF3 ... third colored resin, CF4 ... fourth colored resin, 34 ... color filter layer

Claims (4)

A liquid crystal display panel holding a liquid crystal layer between a pair of substrates disposed opposite to each other;
Reflecting portions of a plurality of pixels arranged in a matrix that the liquid crystal display panel has,
The polarizing plate is provided on one outer surface of the liquid crystal display panel corresponding to the incident surface of light incident on the reflecting portion, and is disposed between the single polarizing plate and the polarizing plate and the liquid crystal display panel. An optical element including a single phase difference plate that converts linearly polarized light transmitted through the light into elliptically polarized light, and
Corresponding to each pixel, provided on the inner surface of the liquid crystal display panel, the first colored resin disposed in the reflective portion of the red pixel, the second colored resin disposed in the reflective portion of the green pixel, and the reflective portion of the blue pixel A color filter layer comprising a third colored resin disposed;
Comprising
A liquid crystal display device comprising: a fourth colored resin that is disposed in common to the reflection portions of a red pixel, a green pixel, and a blue pixel and has a transmittance peak at a green wavelength.   The liquid crystal display device according to claim 1, wherein the fourth colored resin is a colored resin having a transmittance higher than other wavelengths in a wavelength range of 500 to 600 nm.   The liquid crystal display device according to claim 1, wherein the fourth colored resin is made of the same material as the second colored resin.   The liquid crystal display device according to claim 1, wherein the retardation plate gives a phase difference of ¼ wavelength between light of a predetermined wavelength that passes through the fast axis and the slow axis.

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