WO2012046407A1

WO2012046407A1 - Liquid crystal display device

Info

Publication number: WO2012046407A1
Application number: PCT/JP2011/005414
Authority: WO
Inventors: 壮史石田
Original assignee: シャープ株式会社
Priority date: 2010-10-04
Filing date: 2011-09-27
Publication date: 2012-04-12

Abstract

This liquid crystal display device is provided with: a liquid crystal display panel (50a) in which red, green, and blue subpixels are arranged in a row; a backlight (70a) for emitting blue light (Lb), the backlight (70a) being provided to the reverse side of the liquid crystal display panel (50a); and a light-adjusting unit (22a) for adjusting the blue light (Lb) and supplying the light to the liquid crystal display panel (50a), the light-adjusting unit (22a) being provided between the liquid crystal display panel (50a) and the backlight (70a); the light-adjusting unit (22a) being provided with a red phosphor layer (22ra) overlapped on the red subpixel and adapted to convert the blue light (Lb) into red light (Lr), a green phosphor layer (22ga) overlapped on the green subpixel and adapted to convert the blue light (Lb)into green light (Lg), and a blue transmission layer (22ba) overlapped on the blue subpixel and adapted to transmit the blue light (Lb); and the intensity of blue light (Ltb) transmitted through the blue transmission layer (22ba) in the light-adjusting unit (22a) is lower than the intensity of the blue light (Lb) incident on the red phosphor layer (22ra) and the green phosphor layer (22ga).

Description

Liquid crystal display

The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device including a backlight that emits blue light.

The liquid crystal display device includes, for example, a thin film transistor (hereinafter referred to as “TFT”) substrate, a color filter (hereinafter referred to as “CF”) substrate, and a TFT substrate which are disposed so as to face each other. And a liquid crystal display panel constituted by a liquid crystal layer sealed between CF substrates and the like, and a backlight provided on the back side of the liquid crystal display panel. Here, in the CF substrate, a colored layer colored, for example, red, green, or blue is provided in each sub-pixel constituting the pixel.

In the liquid crystal display device having the above configuration, since light from the backlight is absorbed by, for example, each colored layer constituting the CF substrate, the light use efficiency becomes relatively low. There has been proposed a liquid crystal display device that achieves low power consumption by improving utilization efficiency.

For example, in Patent Document 1, a phosphor layer that emits light of the same color corresponding to each pixel corresponding to the above-described sub-pixels of red, green, and blue is disposed outside the polarizing plate on the light incident side of the liquid crystal display panel. A liquid crystal display device is disclosed in which the phosphor layer of each pixel is excited by light from a light source to emit red, green, and blue light, respectively.

JP 2004-94039 A

By the way, in a liquid crystal display device equipped with a backlight that emits blue light, each of the red and green sub-pixels is provided with a phosphor layer containing a phosphor that converts blue light into red light and green light, respectively. Since it is considered that a transparent layer or a diffusion layer is provided in the pixel, wavelength conversion by the phosphor is performed in each of the red and green subpixels, and wavelength conversion by the phosphor is not performed in the blue subpixel. Become. Here, when the wavelength conversion is performed by the phosphor, the light intensity decreases due to the efficiency of wavelength conversion (quantum efficiency) and the extraction efficiency of isotropically emitted light. The intensity is lower than that of blue light. In this case, the display color on the screen of the liquid crystal display device becomes bluish and an appropriate white balance cannot be obtained, so there is room for improvement.

The present invention has been made in view of such points, and an object thereof is to obtain a suitable white balance by suppressing the bluish color of the display color.

In order to achieve the above object, according to the present invention, in the light adjustment unit, the intensity (amount of light) of the blue light transmitted through the blue transmission layer provided in the blue sub-pixel is changed to red fluorescence provided in the red sub-pixel. The intensity (light quantity) of the blue light incident on the body layer and the intensity (light quantity) of the blue light incident on the green phosphor layer provided in the green subpixel are set lower.

Specifically, a liquid crystal display device according to the present invention includes a liquid crystal display panel in which red, green, and blue sub-pixels constituting pixels are arranged, and a back surface that is provided on the back side of the liquid crystal display panel and emits blue light. A light adjustment unit provided between the liquid crystal display panel and the backlight, and adjusting the blue light incident from the backlight and supplying the light to the liquid crystal display panel. A red phosphor layer provided so as to overlap the sub-pixel and converting the incident blue light into red light, and a green phosphor provided so as to overlap the green sub-pixel and converting the incident blue light into green light A liquid crystal display device comprising a body layer and a blue transmissive layer that is provided so as to overlap the blue sub-pixel and transmits the incident blue light, wherein the light adjusting unit transmits the blue transmissive layer. The intensity of the blue light, characterized in that it is configured to be lower than the intensity of the blue light incident on the red phosphor layer and a green phosphor layer.

According to the above configuration, in each of the red and green sub-pixels, although the red and green phosphor layers have wavelength conversion by the red phosphor layer and the green phosphor layer, the intensity of red light and green light is lower than the incident intensity of blue light. In the adjustment unit, the intensity of the blue light transmitted through the blue transmission layer provided in the blue sub-pixel is changed to the intensity of the blue light incident on the red phosphor layer provided in the red sub-pixel, and the green sub-pixel. Since the intensity of the blue light incident on the provided green phosphor layer is lower, the intensity of the blue light transmitted through the blue transmission layer provided in the blue sub-pixel in the light adjustment unit, the red sub-pixel It is possible to make the intensity of the red light converted by the red phosphor layer provided in the green and the intensity of the green light converted by the green phosphor layer provided in the green sub-pixel uniform. As a result, red light, green light, and blue light can be incident on the red, green, and blue sub-pixels arranged on the liquid crystal display panel with the same intensity, so that the light passes through the liquid crystal display panel. In the image display performed by adjusting the light transmittance for each sub-pixel, blue of the display color is suppressed. In the liquid crystal display device, since the white balance can be adjusted by suppressing the blue color of the display color, the blue color of the display color is suppressed and an appropriate white balance can be obtained.

The light adjustment unit includes a light shielding layer that is opened so as to overlap each of the red, green, and blue subpixels, and an area of the light shielding layer that is opened so as to overlap the blue subpixel is the red color Also, the area may be smaller than the open area so as to overlap the green sub-pixels.

According to the above configuration, in the light shielding layer constituting the light adjustment unit, the opening area overlapping the blue subpixel is smaller than the opening area overlapping the red and green subpixels. And the intensity ratio of the blue light transmitted through the blue transmission layer provided in the blue sub-pixel in the light adjustment unit in the light adjustment unit according to the area ratio of each opening portion of the light shielding layer overlapping each blue sub-pixel. Specifically, it is lower than the intensity of blue light incident on the provided red phosphor layer and the intensity of blue light incident on the green phosphor layer provided on the green subpixel.

The light shielding layer may have light reflectivity.

According to the above configuration, since the light shielding layer has light reflectivity, among the blue light from the backlight, the blue light that has not passed through each opening of the light shielding layer is reflected on the light shielding layer and the backlight ( The reflection efficiency of the blue light from the backlight is improved by sequentially reflecting and reusing it with the reflection sheet provided.

The area opened so as to overlap with the blue subpixel may be less than or equal to ½ of the area opened so as to overlap with the red and green subpixels.

According to the above configuration, in the light shielding layer that configures the light adjustment unit, the area opened so as to overlap the blue subpixel is less than or equal to ½ of the area opened so as to overlap each of the red and green subpixels. Therefore, the blue light transmitted through the blue transmission layer provided in the blue sub-pixel is adjusted in the light adjustment unit according to the area ratio of each opening portion of the light-shielding layer overlapping the red, green, and blue sub-pixels. Is specifically 1 of the intensity of blue light incident on the red phosphor layer provided in the red subpixel and the intensity of blue light incident on the green phosphor layer provided in the green subpixel. / 2 or less.

The blue subpixel may be formed smaller than the red and green subpixels.

According to the above configuration, since the blue subpixel is formed smaller than the red and green subpixels, the blue subpixel is selected in the light adjustment unit depending on the size of the red, green, and blue subpixels. The intensity of the blue light transmitted through the blue transmission layer provided on the red sub-pixel is the intensity of the blue light incident on the red phosphor layer provided on the red sub-pixel, and the green phosphor layer provided on the green sub-pixel. Specifically, it is lower than the intensity of the incident blue light.

The light adjusting unit may include a light shielding layer provided in the blue sub-pixel and opened by the blue sub-pixel.

According to the above configuration, since the light adjustment unit has the light shielding layer opened in the blue subpixel, the light shielding layer is not disposed in each of the red and green subpixels. The aperture ratio in the sub-pixel is improved.

The light adjusting unit may be provided with a partition that separates the red fluorescent layer, the green fluorescent layer, and the blue transmitting layer.

According to the above configuration, the light adjusting unit is provided with the partition that separates the red fluorescent layer, the green fluorescent layer, and the blue transmissive layer. Therefore, the red light and the green fluorescent layer converted by the red fluorescent layer are provided. Color mixing between the green light converted in step 1 and the blue light transmitted through the blue transmission layer is suppressed.

The light adjusting unit may be provided with a light shielding layer so as to overlap the partition wall.

According to the above configuration, since the light adjusting unit is provided with the light shielding layer so as to overlap the partition wall, the red light converted by the red fluorescent layer, the green light converted by the green fluorescent layer, and the blue light transmission The red phosphor layer provided in the red sub-pixel has the intensity of blue light transmitted through the blue transmissive layer provided in the blue sub-pixel while the color mixture between the blue light transmitted through the layer is suppressed by the partition wall The intensity of the blue light incident on the green sub-pixel and the intensity of the blue light incident on the green phosphor layer provided in the green subpixel are lower.

The light shielding layer may have light reflectivity.

According to said structure, since the light shielding layer which overlaps with a partition has light reflectivity, the blue light which did not pass between light shielding layers among the blue light from a backlight is light shielding layer and backlight ( The reflection efficiency of the blue light from the backlight is improved by sequentially reflecting and reusing it with the reflection sheet provided on the backlight.

The partition may have a light shielding property.

According to the above configuration, since the partition wall itself has a light shielding property, the red light converted by the red fluorescent layer, the green light converted by the green fluorescent layer, and a separate light shielding layer are not provided. The color mixing between the blue light transmitted through the blue transmission layer is suppressed by the partition wall, and the intensity of the blue light transmitted through the blue transmission layer provided in the blue sub-pixel is reduced by the red fluorescence provided in the red sub-pixel. It becomes lower than the intensity of the blue light incident on the body layer and the intensity of the blue light incident on the green phosphor layer provided in the green subpixel.

According to the present invention, in the light adjustment unit, the intensity of the blue light transmitted through the blue transmission layer provided in the blue sub-pixel is the intensity of the blue light incident on the red phosphor layer provided in the red sub-pixel. Since the intensity of the blue light incident on the green phosphor layer provided in the green subpixel is lower than the intensity of blue light, it is possible to suppress the bluishness of the display color and obtain an appropriate white balance.

FIG. 1 is a cross-sectional view of the liquid crystal display device according to the first embodiment. FIG. 2 is an explanatory diagram illustrating a positional relationship between the configuration of the pixel and the configuration of the light adjustment unit in the liquid crystal display device according to the first embodiment. FIG. 3 is a graph showing an emission spectrum in the liquid crystal display device according to the first embodiment. FIG. 4 is a cross-sectional view of the liquid crystal display device according to the second embodiment. FIG. 5 is an explanatory diagram showing a positional relationship between the configuration of the pixels and the configuration of the light adjustment unit in the liquid crystal display device according to the second embodiment. FIG. 6 is a cross-sectional view of the liquid crystal display device according to the third embodiment. FIG. 7 is an explanatory diagram illustrating a positional relationship between the configuration of the pixel and the configuration of the light adjustment unit in the liquid crystal display device according to the third embodiment. FIG. 8 is a cross-sectional view of the liquid crystal display device according to the fourth embodiment. FIG. 9 is an explanatory diagram illustrating a positional relationship between the configuration of the pixels and the configuration of the light adjustment unit in the liquid crystal display device according to the fourth embodiment. FIG. 10 is a cross-sectional view of the liquid crystal display device according to the fifth embodiment. FIG. 11 is a cross-sectional view of the liquid crystal display device according to the sixth embodiment. FIG. 12 is a cross-sectional view of the liquid crystal display device according to the seventh embodiment. FIG. 13 is a cross-sectional view of the liquid crystal display device according to the eighth embodiment. FIG. 14 is a graph showing an emission spectrum in the liquid crystal display device according to the comparative example.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments.

Embodiment 1 of the Invention
1 to 3 show Embodiment 1 of a liquid crystal display device according to the present invention. Specifically, FIG. 1 is a cross-sectional view of the liquid crystal display device 100a of the present embodiment. FIG. 2 is an explanatory diagram perspectively showing the positional relationship between the configuration of the pixel Pa and the configuration of the light adjustment unit 22a in the liquid crystal display device 100a.

As shown in FIG. 1, the liquid crystal display device 100a includes a liquid crystal display panel 50a in which a plurality of pixels Pa (see FIG. 2) are arranged in a matrix, and a front surface (upper surface in the figure) and a rear surface (rear surface) of the liquid crystal display panel 50a. , A pair of

polarizing plates

51a and 51b attached to the lower surface of the figure, a backlight 70a emitting blue light Lb provided on the back side of the liquid crystal display panel 50a, and the liquid crystal display panel 50a (attached to the liquid crystal display panel 50a). And a phosphor substrate 60a including a light adjusting unit 22a for adjusting the blue light Lb from the backlight 70a and supplying it to the liquid crystal display panel 50a. Yes.

In each pixel Pa, a red subpixel Pra that performs red gradation display, a green subpixel Pga that performs green gradation display, and a blue subpixel that performs blue gradation display, which are formed in the same size. Pba is arranged as shown in FIG.

As shown in FIG. 1, the liquid crystal display panel 50a includes a TFT substrate 20a and a CF substrate 30a arranged to face each other, a liquid crystal layer 40 provided between the TFT substrate 20a and the CF substrate 30a, and a TFT substrate. 20a and the counter substrate 30a are bonded to each other, and a sealing material (not shown) provided in a frame shape is provided to enclose the liquid crystal layer 40 between the TFT substrate 20a and the counter substrate 30a.

As shown in FIG. 1, the TFT substrate 20a includes an insulating substrate 10a such as a glass substrate, a plurality of gate lines (not shown) provided on the insulating substrate 10a so as to extend in parallel with each other, and orthogonal to each gate line. And a plurality of source lines 11 provided so as to extend in parallel with each other, and a plurality of source lines 11 provided for each gate line and each intersecting portion of each source line 11, that is, for each subpixel Pra, Pga and Pba. TFT (not shown), a protective film (not shown) provided so as to cover each TFT, a plurality of pixel electrodes (not shown) provided in a matrix on the protective film and connected to each TFT And an alignment film (not shown) provided so as to cover each pixel electrode.

As shown in FIG. 1, the CF substrate 30a includes an insulating substrate 10b such as a glass substrate, a black matrix (not shown) provided in a lattice shape on the insulating substrate 10b, and each subpixel between the lattices of the black matrix. A red layer 16ra, a green layer 16ga, and a blue layer 16ba that are provided corresponding to Pra, Pga, and Pba, respectively, and a common electrode that is provided so as to cover the black matrix, the red layer 16ra, the green layer 16ga, and the blue layer 16ba ( (Not shown) and an alignment film (not shown) provided so as to cover the common electrode.

The liquid crystal layer 40 is made of a nematic liquid crystal material having electro-optical characteristics.

The backlight 70a includes a linear light source (not shown) that emits blue light, a light guide plate (not shown) provided on the side of the linear light source, and a reflection sheet (not shown) provided below the light guide plate. And a diffusion sheet (not shown) provided on the light guide plate and a prism sheet (not shown) provided on the diffusion sheet, the blue light from the linear light source is converted into the light guide plate, the reflection sheet, and the diffusion. It is configured to emit blue light Lb (see FIG. 1) through the sheet and the prism sheet. Here, each linear light source includes a plurality of blue LEDs (Light-Emitting-Diodes) provided in a row that emits blue light.

As shown in FIG. 1, the phosphor substrate 60a includes an insulating substrate 10c such as a glass substrate, and a light adjusting unit 22a provided on the insulating substrate 10c.

As shown in FIGS. 1 and 2, the light adjusting unit 22a includes a light shielding layer 21a provided on the insulating substrate 10c, and a red phosphor layer provided on the light shielding layer 21a so as to overlap the red subpixel Pra. 22ra, a green phosphor layer 22ga provided on the light shielding layer 21a so as to overlap the green subpixel Pga, and a blue transmission layer 22ba provided on the light shielding layer 21a so as to overlap the blue subpixel Pba. I have.

As shown in FIG. 2, the light shielding layer 21a includes an opening Ar provided so as to overlap the red subpixel Pra, an opening Ag provided so as to overlap the green subpixel Pga, and the blue subpixel Pba. The opening Ab is provided so as to overlap. Here, the area of the opening Ab that overlaps the blue subpixel Pba is 1/20 to 1/2 of the area of the opening Ar that overlaps the red subpixel Pra and the area of the opening Ag that overlaps the green subpixel Pga. It is about. In the present embodiment, the configuration in which the light shielding layer 21a is provided below the red phosphor layer 22ra, the green phosphor layer 22ga, and the blue transmission layer 22ba is exemplified. However, the light shielding layer 21a includes the red phosphor layer 22ra, It may be provided on the upper layer of the green phosphor layer 22ga and the blue transmission layer 22ba.

As shown in FIG. 1, the red phosphor layer 22ra is a transparent resin layer (thickness of about 10 μm to several tens of μm) in which a phosphor for converting blue light Lb from the backlight 70a into red light Lr is dispersed. is there.

As shown in FIG. 1, the green phosphor layer 22ga is a transparent resin layer (thickness of about 10 μm to several tens of μm) in which a phosphor for converting the blue light Lb from the backlight 70a into the green light Lg is dispersed. is there.

As shown in FIG. 1, the blue transmissive layer 22ba is a transparent resin layer (thickness of about 10 μm to several tens of μm) configured to transmit part of the blue light Lb from the backlight 70a as the blue light Ltb. . In the present embodiment, the transparent resin layer is exemplified as the blue transmissive layer 22ba. However, the blue light Lb from the backlight 70a is dispersed by dispersing transparent beads having a refractive index different from that of the transparent resin layer in the transparent resin layer. May be transmitted while being diffused, or may be a transparent inorganic material layer or a space layer.

Here, as described above, in the light shielding layer 21a of the light adjusting unit 22a, the opening area overlapping the blue subpixel Pba is 1/20 to 1/1 of the opening area overlapping the red and green subpixels Pra and Pga. Therefore, the light adjustment unit 22a has a blue subpixel according to the area ratio of each opening portion of the light shielding layer 21a that overlaps the red subpixel Pra, the green subpixel Pga, and the blue subpixel Pba. The intensity of the blue light Ltb that is transmitted through the blue transmission layer 22ba provided in Pba is the same as the intensity of the blue light Lb that is incident on the red phosphor layer 22ra provided in the red subpixel Pra, and the green subpixel Pga. It becomes about 1/20 to 1/2 of the intensity of the blue light Lb incident on the green phosphor layer 22ga thus obtained, and the blue transmission layer 22 provided in the blue sub-pixel Pba in the light adjustment unit 22a. The intensity of the blue light Ltb transmitted through a, the intensity of the red light Lr converted by the red phosphor layer 22ra provided in the red subpixel Pra, and the green phosphor layer 22ga provided in the green subpixel Pga The intensities of the converted green light Lg can be made uniform.

FIG. 3 shows the liquid crystal display device 100a, which is provided in the blue subpixel Pba according to the area ratio of the open portions of the light shielding layer 21a overlapping the red subpixel Pra, the green subpixel Pga, and the blue subpixel Pba. The intensity of the blue light Ltb transmitted through the blue transmission layer 22ba is the same as the intensity of the blue light Lb incident on the red phosphor layer 22ra provided in the red subpixel Pra and the green fluorescence provided in the green subpixel Pga. It is a graph which shows the emission spectrum of the Example made into 1/3 of the intensity | strength of the blue light Lb which injects into the body layer 22ga. FIG. 14 is a graph showing a light emission spectrum of a comparative example in which the areas of the opened portions of the light shielding layer 21a overlapping the red subpixel Pra, the green subpixel Pga, and the blue subpixel Pba are equal to each other. The graphs of FIGS. 3 and 14 are obtained by adding together the emission spectrum of the red phosphor layer 22ra, the emission spectrum of the green phosphor layer 22ga, and the emission spectrum of the blue transmission layer 22ba.

Furthermore, in the above examples and comparative examples, the chromaticity of the CIE 1931 color system was calculated under the following conditions.

<Calculation conditions>
Blue light source peak wavelength: 450 nm
Blue light source half width: 20 nm
Green phosphor peak wavelength: 530 nm
Green phosphor half width: 80 nm
Red phosphor peak wavelength: 630 nm
Green phosphor half width: 80 nm
Quantum efficiency of conversion from blue light to green light: 80%
Light extraction efficiency above the green phosphor: 50%
Quantum efficiency of conversion from blue light to red light: 80%
Light extraction efficiency above the red phosphor: 50%
Ratio of the opening area of the light shielding layer to the area of the green subpixel: 90%
Ratio of aperture area of light shielding layer to area of red subpixel: 90%
In the embodiment, as shown in FIG. 3, since the relative intensity of blue light is low and the chromaticity coordinates (x, y) are (0.2901, 0.2812), an appropriate white balance can be obtained. It is considered easy.

In the comparative example, as shown in FIG. 14, the relative intensity of blue light is high and the chromaticity coordinates (x, y) are (0.2233, 0.1623), so that an appropriate white balance is obtained. Is considered difficult.

Note that the intensity of the blue light Ltb transmitted through the blue transmission layer 22ba provided in the blue subpixel Pba, the intensity of the blue light Lb incident on the red phosphor layer 22ra provided in the red subpixel Pra, and green In order to reduce the intensity of the blue light Lb incident on the green phosphor layer 22ga provided in the subpixel Pga to 1/3, the opening area of the light shielding layer 21a overlapping the blue subpixel Pba is changed to red and green. Although it is necessary to make the opening area overlapping each of the subpixels Pra and Pga to be 1/3, the light shielding layer 21a is formed of a light reflective material (for example, an aluminum film), and the reflected light Lrb of the blue light Lb is regenerated. By using at a utilization rate of 75%, in the light shielding layer 21a, the opening area overlapping the blue subpixel Pba is set to ½ of the opening area overlapping the red and green subpixels Pra and Pga. It is possible, it is possible to improve the utilization efficiency of blue light Lb to 1.3 times the case where the light-shielding layer 21a does not have light reflectivity.

The liquid crystal display device 100a having the above configuration applies a predetermined voltage to each of the subpixels Pra, Pga and Pba to the liquid crystal layer 40 disposed between each pixel electrode on the TFT substrate 20a and the common electrode on the CF substrate 30a. By changing the alignment state of the liquid crystal layer 40, the transmittance of the red light Lr, the green light Lg, and the blue light Ltb transmitted through the liquid crystal display panel 50a is adjusted for each of the subpixels Pra, Pga, and Pba. It is configured to display.

As described above, according to the liquid crystal display device 100a of the present embodiment, in each of the red and green subpixels Pra and Pga, the red light Lr and the green light are converted by the wavelength conversion by the red phosphor layer 22ra and the green phosphor layer 22ga. Although the intensity of the light Lg is lower than the incident intensity of the blue light Lb, the intensity of the blue light Ltb transmitted through the blue transmission layer 22ba provided in the blue subpixel Pba in the light adjustment unit 22a is red. Since it is lower than the intensity of the blue light Lb incident on the red phosphor layer 22ra provided in the pixel Pra and the intensity of the blue light Lb incident on the green phosphor layer 22ga provided in the green sub-pixel Pga. In the light adjustment unit 22a, the intensity of the blue light Ltb transmitted through the blue transmission layer 22ba provided in the blue subpixel Pba is set in the red subpixel Pra. Was can be aligned intensity of the converted red light Lr by the red phosphor layer 22RA, and the intensity of the green light Lg converted by a green phosphor layer 22ga provided a green subpixel Pga. As a result, the red light Lr, the green light Lg, and the blue light Ltb are incident on the red, green, and blue sub-pixels Pra, Pga, and Pba arranged on the liquid crystal display panel 50a with the same intensity. Therefore, in the image display performed by adjusting the transmittance of the red light Lr, the green light Lg, and the blue light Ltb transmitted through the liquid crystal display panel 50a for each of the sub-pixels Pra, Pga, and Pba, the display color is bluish. Can be suppressed. In the liquid crystal display device 100a, since the white balance can be adjusted by suppressing the blue color of the display color, the blue color of the display color can be suppressed and an appropriate white balance can be obtained.

<< Embodiment 2 of the Invention >>
FIG. 4 is a cross-sectional view of the liquid crystal display device 100b of this embodiment. FIG. 5 is an explanatory diagram perspectively showing the positional relationship between the configuration of the pixel Pb and the configuration of the light adjustment unit 22b in the liquid crystal display device 100b. In the following embodiments, the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

In the first embodiment, the liquid crystal display device 100a in which the red, green, and blue subpixels Pra, Pga, and Pba are formed with the same size is illustrated. However, in the present embodiment, the blue subpixel Pbb is relatively A liquid crystal display device 100b formed to be small is illustrated.

Specifically, as shown in FIG. 4, the liquid crystal display device 100b includes a liquid crystal display panel 50b in which a plurality of pixels Pb (see FIG. 5) are arranged in a matrix, and the surface (upper surface in the drawing) of the liquid crystal display panel 50b. And a pair of

polarizing plates

51a and 51b attached to the back surface (the back surface, the bottom surface in the figure), a backlight 70a provided on the back side of the liquid crystal display panel 50b, and the liquid crystal display panel 50b And a phosphor substrate 60b including a light adjusting unit 22b provided between the polarizing plate 51b) and the backlight 70a for adjusting the blue light Lb from the backlight 70a and supplying it to the liquid crystal display panel 50b. .

In each pixel Pb, a relatively large red sub-pixel Prb that performs red gradation display, a green sub-pixel Pgb that performs green gradation display, and a relatively small blue floor. As shown in FIG. 5, the blue sub-pixels Pbb that perform the tone display are arranged.

As shown in FIG. 4, the liquid crystal display panel 50b includes a TFT substrate 20b and a CF substrate 30b arranged to face each other, a liquid crystal layer 40 provided between the TFT substrate 20b and the CF substrate 30b, and a TFT substrate. A sealing material (not shown) provided in a frame shape is provided for adhering the liquid crystal layer 40 between the TFT substrate 20b and the counter substrate 30b.

As shown in FIG. 4, in the TFT substrate 20b, the intervals between the source lines 11 and the sizes of the pixel electrodes differ according to the sizes of the subpixel Prb, the subpixel Pgb, and the subpixel Pbb constituting each pixel Pb. The other configurations are substantially the same as those of the TFT substrate 20a of the first embodiment.

As shown in FIG. 4, the CF substrate 30b corresponds to the size of the sub-pixel Prb, the sub-pixel Pgb, and the sub-pixel Pbb constituting each pixel Pb, the spacing between the black matrixes, and the red layer 16rb. The other configurations are substantially the same as those of the CF substrate 30a of the first embodiment except that the sizes of the green layer 16gb and the blue layer 16bb are different.

As shown in FIG. 4, the phosphor substrate 60b includes an insulating substrate 10c and a light adjusting unit 22b provided on the insulating substrate 10c.

As shown in FIGS. 4 and 5, the light adjusting unit 22b includes a light shielding layer 21b provided on the insulating substrate 10c and a red phosphor layer provided on the light shielding layer 21b so as to overlap the red subpixel Prb. 22rb, a green phosphor layer 22gb provided on the light shielding layer 21b so as to overlap the green subpixel Pgb, and a blue transmission layer 22bb provided on the light shielding layer 21b so as to overlap the blue subpixel Pbb. I have.

As shown in FIG. 5, the light shielding layer 21b includes an opening Ar provided so as to overlap the red subpixel Prb, an opening Ag provided so as to overlap the green subpixel Pgb, and the blue subpixel Pbb. The opening Ab is provided so as to overlap. Here, the area of the opening Ab overlapping the blue subpixel Pbb is 1/20 to 1/2 of the area of the opening Ar overlapping the red subpixel Prb and the area of the opening Ag overlapping the green subpixel Pgb. It is about.

As shown in FIG. 4, the red phosphor layer 22rb is a transparent resin layer (thickness of about 10 μm to several tens of μm) in which a phosphor for converting the blue light Lb from the backlight 70a into the red light Lr is dispersed. is there.

As shown in FIG. 4, the green phosphor layer 22gb is a transparent resin layer (thickness of about 10 μm to several tens of μm) in which a phosphor for converting the blue light Lb from the backlight 70a into the green light Lg is dispersed. is there.

As shown in FIG. 4, the blue transmissive layer 22bb is a transparent resin layer (thickness of about 10 μm to several tens of μm) configured to transmit part of the blue light Lb from the backlight 70a as the blue light Ltb. .

Here, as described above, the blue subpixel Pbb is formed to be smaller than the red subpixel Prb and the green subpixel Pgb, and the light blocking layer 21b of the light adjustment unit 22b includes the blue subpixel Pbb. Since the overlapping opening area is about 1/20 to 1/2 of the opening area overlapping the red and green subpixels Prb and Pgb, the red subpixel Prb, the green subpixel Pgb, and the blue subpixel are arranged. The intensity of the blue light Ltb transmitted through the blue transmission layer 22bb provided in the blue subpixel Pbb in the light adjustment unit 22b is determined by the area ratio of each opened portion of the light shielding layer 21b overlapping the Pbb. 1 of the intensity of the blue light Lb incident on the red phosphor layer 22rb provided on the green and the intensity of the blue light Lb incident on the green phosphor layer 22gb provided on the green sub-pixel Pgb. In the light adjustment unit 22b, the intensity of the blue light Ltb transmitted through the blue transmission layer 22bb provided in the blue subpixel Pbb and the red phosphor layer provided in the red subpixel Prb are reduced to about 20 to 1/2. The intensity of the red light Lr converted by 22rb and the intensity of the green light Lg converted by the green phosphor layer 22gb provided in the green subpixel Pgb can be made uniform.

Further, in the present embodiment, when the chromaticity is calculated in the same manner as the calculation conditions of the first embodiment, the liquid crystal display device 100b shields light from overlapping the red subpixel Prb, the green subpixel Pgb, and the blue subpixel Pbb. The intensity of the blue light Ltb transmitted through the blue transmission layer 22bb provided in the blue subpixel Pbb is changed to the red phosphor layer 22rb provided in the red subpixel Prb by the area ratio of each opened portion of the layer 21b. In an embodiment in which the intensity of the incident blue light Lb and the intensity of the blue light Lb incident on the green phosphor layer 22gb provided in the green sub-pixel Pgb is 1/3, the chromaticity coordinates (x, y) are (0.2901, 0.2812), it is considered easy to obtain an appropriate white balance, whereas the red subpixel Prb, the green subpixel Pgb, and the blue subpixel In the comparative example in which the areas of the opened portions of the light shielding layer 21b overlapping the pixel Pbb are equal to each other, the chromaticity coordinates (x, y) are (0.2233, 0.1623). It is considered difficult to obtain.

Furthermore, since the area occupied by the light shielding layer 21b in the blue sub-pixel Pbb is small, in this embodiment, when the light shielding layer 21b has light reflectivity, the light use efficiency is set to the above embodiment. 1 can be improved to 1.05 times that of the corresponding embodiment (with light reflectivity: yes), and when the light-shielding layer 21b does not have light reflectivity, the light utilization efficiency can be improved. It can be improved 1.3 times as much as the corresponding example of Embodiment 1 (light reflectivity: none).

The liquid crystal display device 100b having the above configuration applies a predetermined voltage to each of the subpixels Prb, Pgb, and Pbb to the liquid crystal layer 40 disposed between each pixel electrode on the TFT substrate 20b and the common electrode on the CF substrate 30b. By changing the alignment state of the liquid crystal layer 40, the transmittance of the red light Lr, the green light Lg, and the blue light Ltb transmitted through the liquid crystal display panel 50b is adjusted for each of the subpixels Prb, Pgb, and Pbb. It is configured to display.

As described above, according to the liquid crystal display device 100b of the present embodiment, in the red and green subpixels Prb and Pgb, the red light Lr and the green light are converted by the wavelength conversion by the red phosphor layer 22rb and the green phosphor layer 22gb. Although the intensity of the light Lg is lower than the incident intensity of the blue light Lb, the intensity of the blue light Ltb transmitted through the blue transmission layer 22bb provided in the blue subpixel Pbb in the light adjustment unit 22b is red. Since the intensity of the blue light Lb incident on the red phosphor layer 22rb provided in the pixel Prb and the intensity of the blue light Lb incident on the green phosphor layer 22gb provided in the green sub-pixel Pgb are lower. In the light adjustment unit 22b, the intensity of the blue light Ltb transmitted through the blue transmission layer 22bb provided in the blue subpixel Pbb is set in the red subpixel Prb. Was can be aligned intensity of the converted red light Lr by the red phosphor layer 22Rb, and the intensity of the green light Lg converted by a green phosphor layer 22gb provided a green subpixel Pgb. Accordingly, the red light Lr, the green light Lg, and the blue light Ltb are incident on the red, green, and blue sub-pixels Prb, Pgb, and Pbb arranged on the liquid crystal display panel 50b in a state where the intensities are uniform. Therefore, in the image display performed by adjusting the transmittance of the red light Lr, the green light Lg, and the blue light Ltb transmitted through the liquid crystal display panel 50b for each sub-pixel Prb, Pgb, and Pbb, the blue of the display color is suppressed. can do. In the liquid crystal display device 100b, since the white balance can be adjusted by suppressing the blue color of the display color, the blue color of the display color can be suppressed and an appropriate white balance can be obtained.

<< Embodiment 3 of the Invention >>
FIG. 6 is a cross-sectional view of the liquid crystal display device 100c of this embodiment. FIG. 7 is an explanatory diagram perspectively showing a positional relationship between the configuration of the pixel Pa and the configuration of the light adjusting unit 22c in the liquid crystal display device 100c.

In the first and second embodiments, the liquid

crystal display devices

100a and 100b in which the light shielding layers 21a and 21b are provided in the red, green, and blue subpixels are illustrated. However, in the present embodiment, only the blue subpixels are provided. A liquid crystal display device 100c provided with a light shielding layer 21c is illustrated.

Specifically, as shown in FIG. 6, the liquid crystal display device 100c includes a liquid crystal display panel 50a in which a plurality of pixels Pa (see FIG. 7) are arranged in a matrix, and the surface (upper surface in the drawing) of the liquid crystal display panel 50a. And a pair of

polarizing plates

51a and 51b attached to the back surface (rear surface, lower surface in the figure), a backlight 70a provided on the back surface side of the liquid crystal display panel 50a, and the liquid crystal display panel 50a A polarizing plate 51b) and a phosphor substrate 60c including a light adjusting portion 22c for adjusting the blue light Lb from the backlight 70a and supplying the blue light Lb to the liquid crystal display panel 50a. .

As shown in FIG. 6, the phosphor substrate 60c includes an insulating substrate 10c and a light adjusting unit 22c provided on the insulating substrate 10c.

As shown in FIGS. 6 and 7, the light adjusting unit 22c overlaps the light-shielding layer 21c provided on the insulating substrate 10c so as to overlap the blue subpixel Pba and the red subpixel Pra on the insulating substrate 10c. The red phosphor layer 22rc provided in this manner, the green phosphor layer 22gc provided on the insulating substrate 10c so as to overlap the green subpixel Pga, and the blue subpixel Pba so as to overlap the light shielding layer 21c. And a blue transmission layer 22bc provided.

As shown in FIG. 7, the light shielding layer 21 c includes an opening Ab provided so as to overlap the blue subpixel Pba.

As shown in FIG. 6, the red phosphor layer 22rc is a transparent resin layer (thickness of about 10 μm to several tens of μm) in which a phosphor for converting the blue light Lb from the backlight 70a into the red light Lr is dispersed. is there.

As shown in FIG. 6, the green phosphor layer 22gc is a transparent resin layer (thickness of about 10 μm to several tens of μm) in which a phosphor for converting the blue light Lb from the backlight 70a into the green light Lg is dispersed. is there.

As shown in FIG. 6, the blue transmissive layer 22bc is a transparent resin layer (thickness of about 10 μm to several tens of μm) configured to transmit a part of the blue light Lb from the backlight 70a as the blue light Ltb. .

Here, as described above, since the light blocking layer 21c of the light adjustment unit 22c is provided only in the blue subpixel Pb, the blue transmission layer 22bc provided in the blue subpixel Pba in the light adjustment unit 22c. The intensity of the blue light Ltb that passes through is incident on the red phosphor layer 22rc provided on the red subpixel Pra, and on the green phosphor layer 22gc provided on the green subpixel Pga. The intensity of the blue light Ltb transmitted through the blue transmission layer 22bc provided in the blue subpixel Pba and the red fluorescence provided in the red subpixel Pra are lower than the intensity of the blue light Lb. The intensity of the red light Lr converted by the body layer 22rc and the intensity of the green light Lg converted by the green phosphor layer 22gc provided in the green subpixel Pga can be made uniform. That.

As described above, according to the liquid crystal display device 100c of the present embodiment, in each of the red and green subpixels Pra and Pga, the red light Lr and the green light are converted by the wavelength conversion by the red phosphor layer 22rc and the green phosphor layer 22gc. Although the intensity of the light Lg is lower than the incident intensity of the blue light Lb, the intensity of the blue light Ltb transmitted through the blue transmission layer 22bc provided in the blue subpixel Pba in the light adjusting unit 22c is red. Since it is lower than the intensity of the blue light Lb incident on the red phosphor layer 22rc provided in the pixel Pra and the intensity of the blue light Lb incident on the green phosphor layer 22gc provided in the green sub-pixel Pga. In the light adjustment unit 22c, the intensity of the blue light Ltb transmitted through the blue transmission layer 22bc provided in the blue subpixel Pba is set in the red subpixel Pra. It was can be aligned intensity of the converted red light Lr by the red phosphor layer 22Rc, and the intensity of the green light Lg converted by a green phosphor layer 22gc provided a green subpixel Pga. As a result, the red light Lr, the green light Lg, and the blue light Ltb are incident on the red, green, and blue sub-pixels Pra, Pga, and Pba arranged on the liquid crystal display panel 50a with the same intensity. Therefore, in the image display performed by adjusting the transmittance of the red light Lr, the green light Lg, and the blue light Ltb transmitted through the liquid crystal display panel 50a for each of the sub-pixels Pra, Pga, and Pba, the display color is bluish. Can be suppressed. In the liquid crystal display device 100c, since the white balance can be adjusted by suppressing the blue color of the display color, the blue color of the display color can be suppressed and an appropriate white balance can be obtained.

In addition, according to the liquid crystal display device 100c of the present embodiment, the light adjustment unit 22c has the light shielding layer 21c opened in the blue subpixel Pba, so that the red subpixel Pra and the green subpixel Pga are shielded from light. The layer 21c is not disposed, and each aperture ratio in the red subpixel Pra and the green subpixel Pga can be improved.

<< Embodiment 4 of the Invention >>
FIG. 8 is a cross-sectional view of the liquid crystal display device 100d of this embodiment. FIG. 9 is an explanatory diagram perspectively showing the positional relationship between the configuration of the pixel Pb and the configuration of the light adjustment unit 22d in the liquid crystal display device 100c.

In each of the above embodiments, the liquid crystal display devices 100a to 100c in which the light shielding layer is provided as a part of the light adjustment unit in each of the red, green, and blue subpixels or in the blue subpixel are illustrated. The liquid crystal display device 100d in which the light shielding layer is not provided as a part of the light adjustment unit is illustrated.

Specifically, as shown in FIG. 8, the liquid crystal display device 100d includes a liquid crystal display panel 50b in which a plurality of pixels Pb (see FIG. 9) are arranged in a matrix, and the surface (upper surface in the drawing) of the liquid crystal display panel 50b. And a pair of

polarizing plates

51a and 51b attached to the back surface (the back surface, the bottom surface in the figure), a backlight 70a provided on the back side of the liquid crystal display panel 50b, and the liquid crystal display panel 50b A polarizing plate 51b) and a phosphor substrate 60d including a light adjusting unit 22d for adjusting the blue light Lb from the backlight 70a and supplying the blue light Lb to the liquid crystal display panel 50b. .

As shown in FIG. 8, the phosphor substrate 60d includes an insulating substrate 10c and a light adjusting unit 22d provided on the insulating substrate 10c.

As shown in FIGS. 8 and 9, the light adjusting unit 22d includes a red phosphor layer 22rd provided on the insulating substrate 10c so as to overlap the red subpixel Prb, and a green subpixel Pgb on the insulating substrate 10c. A green phosphor layer 22gd provided so as to overlap the blue sub-pixel Pbb, and a blue transmission layer 22bd provided so as to overlap the blue subpixel Pbb on the insulating substrate 10c.

As shown in FIG. 8, the red phosphor layer 22rd is a transparent resin layer (thickness of about 10 μm to several tens of μm) in which a phosphor for converting blue light Lb from the backlight 70a into red light Lr is dispersed. is there.

As shown in FIG. 8, the green phosphor layer 22gd is a transparent resin layer (thickness of about 10 μm to several tens of μm) in which a phosphor for converting the blue light Lb from the backlight 70a into the green light Lg is dispersed. is there.

As shown in FIG. 8, the blue transmissive layer 22bd is a transparent resin layer (thickness of about 10 μm to several tens of μm) configured to transmit part of the blue light Lb from the backlight 70a as the blue light Ltb. .

Here, as described above, since the blue subpixel Pbb is smaller than the red subpixel Prb and the green subpixel Pgb, the red subpixel Prb, the green subpixel Pgb, and the blue subpixel are formed. Depending on the size of Pbb, in the light adjusting unit 22d, the intensity of the blue light Ltb transmitted through the blue transmission layer 22bd provided in the blue subpixel Pbb is incident on the red phosphor layer 22rd provided in the red subpixel Prb. The intensity of the blue light Lb is lower than the intensity of the blue light Lb incident on the green phosphor layer 22gd provided on the green subpixel Pgb, and the light adjustment unit 22d is provided on the blue subpixel Pbb. The intensity of the blue light Ltb transmitted through the blue transmission layer 22bd, the intensity of the red light Lr converted by the red phosphor layer 22rd provided in the red subpixel Prb, and green Intensity of the converted green light Lg by the green phosphor layer 22gd provided subpixel Pgb of can be made uniform.

As described above, according to the liquid crystal display device 100d of this embodiment, in the red and green subpixels Prb and Pgb, the red light Lr and the green light are converted by the wavelength conversion by the red phosphor layer 22rd and the green phosphor layer 22gd. Although the intensity of the light Lg is lower than the incident intensity of the blue light Lb, the intensity of the blue light Ltb transmitted through the blue transmission layer 22bd provided in the blue subpixel Pbb in the light adjusting unit 22d is red. Since it is lower than the intensity of the blue light Lb incident on the red phosphor layer 22rd provided in the pixel Prb and the intensity of the blue light Lb incident on the green phosphor layer 22gd provided in the green sub-pixel Pgb. In the light adjustment unit 22d, the intensity of the blue light Ltb transmitted through the blue transmission layer 22bd provided in the blue subpixel Pbb is set in the red subpixel Prb. Was can be aligned intensity of the converted red light Lr by the red phosphor layer 22Rd, and the intensity of the green light Lg converted by a green phosphor layer 22gd provided a green subpixel Pgb. Accordingly, the red light Lr, the green light Lg, and the blue light Ltb are incident on the red, green, and blue sub-pixels Prb, Pgb, and Pbb arranged on the liquid crystal display panel 50b in a state where the intensities are uniform. Therefore, in the image display performed by adjusting the transmittance of the red light Lr, the green light Lg, and the blue light Ltb transmitted through the liquid crystal display panel 50b for each sub-pixel Prb, Pgb, and Pbb, the blue of the display color is suppressed. can do. In the liquid crystal display device 100d, since the white balance can be adjusted by suppressing the blue color of the display color, the blue color of the display color can be suppressed and an appropriate white balance can be obtained.

Further, according to the liquid crystal display device 100d of the present embodiment, since the light adjusting unit 22d is not provided with the light shielding layer, the aperture ratios of the sub-pixels Prb, Pgb, and Pbb can be improved.

<< Embodiment 5 of the Invention >>
FIG. 10 is a cross-sectional view of the liquid crystal display device 100e of this embodiment.

In each of the above-described embodiments, the liquid crystal display devices 100a to 100d in which the partition is not provided between the red phosphor layer, the green phosphor layer, and the blue transmission layer constituting the light adjustment units 22a to 22d are exemplified. In the embodiment, a liquid crystal display device 100e in which a partition wall 23a is provided between a red phosphor layer, a green phosphor layer, and a blue transmission layer that constitute the light adjusting unit 22e is illustrated.

Specifically, as shown in FIG. 10, the liquid crystal display device 100e includes a liquid crystal display panel 50a in which a plurality of pixels (Pa) are arranged in a matrix, and a front surface (upper surface in the drawing) and a rear surface ( A pair of

polarizing plates

51a and 51b attached to the back surface and the bottom surface in the drawing, a backlight 70a provided on the back side of the liquid crystal display panel 50a, and a polarizing plate 51b attached to the liquid crystal display panel 50a ) And the backlight 70a, and a phosphor substrate 60e including a light adjusting unit 22e for adjusting the blue light Lb from the backlight 70a and supplying it to the liquid crystal display panel 50a.

As shown in FIG. 10, the phosphor substrate 60e includes an insulating substrate 10c and a light adjusting unit 22e provided on the insulating substrate 10c.

As shown in FIG. 10, the light adjustment unit 22e overlaps the light shielding layer 21e provided on the insulating substrate 10c, the partition wall 23a provided in a lattice shape on the light shielding layer 21e, and the red sub-pixel (Pra). Thus, the red phosphor layer 22re provided between the barrier ribs 23a, the green phosphor layer 22ge provided between the barrier ribs 23a so as to overlap the green subpixel (Pga), and the blue subpixel (Pba). And a blue transmission layer 22be provided between the partition walls 23a.

As shown in FIG. 10, the light shielding layer 21e has an opening (Ar) provided so as to overlap the red subpixel (Pra) and an opening (Ag) provided so as to overlap the green subpixel (Pgb). ) And an opening (Ab) provided so as to overlap with the blue sub-pixel (Pbb). Here, the area of the opening (Ab) that overlaps the blue subpixel (Pba) is the opening (Ar) that overlaps the red subpixel (Pra) and the opening (Ag) that overlaps the green subpixel (Pga). ) Is about 1/20 to 1/2 of each area. The light shielding layer 21e may have light reflectivity.

The partition wall 23a is a transparent resin layer (thickness of about 10 μm to several tens of μm).

As shown in FIG. 10, the red phosphor layer 22re is a transparent resin layer (thickness of about 10 μm to several tens of μm) in which a phosphor for converting the blue light Lb from the backlight 70a into the red light Lr is dispersed. is there.

As shown in FIG. 10, the green phosphor layer 22ge is a transparent resin layer (thickness of about 10 μm to several tens of μm) in which a phosphor for converting the blue light Lb from the backlight 70a into the green light Lg is dispersed. is there.

As shown in FIG. 10, the blue transmission layer 22be is a transparent resin layer (thickness of about 10 μm to several tens of μm) configured to transmit part of the blue light Lb from the backlight 70a as the blue light Ltb. .

Here, as described above, in the light shielding layer 21e of the light adjustment unit 22e, the opening area overlapping the blue subpixel (Pba) is 1 / of the opening area overlapping the red and green subpixels (Pra and Pga). Since it is about 20 to 1/2, depending on the area ratio of each opened portion of the light shielding layer 21e overlapping the red subpixel (Pra), the green subpixel (Pga), and the blue subpixel (Pba), In the light adjustment unit 22e, the intensity of the blue light Ltb transmitted through the blue transmission layer 22be provided in the blue subpixel (Pba) is incident on the red phosphor layer 22re provided in the red subpixel (Pra). The intensity of the blue light Lb and the intensity of the blue light Lb incident on the green phosphor layer 22ge provided in the green sub-pixel (Pga) are about 1/20 to 1/2. Sub-pixel The intensity of the blue light Ltb transmitted through the blue transmission layer 22be provided in Pba), the intensity of the red light Lr converted by the red phosphor layer 22re provided in the red subpixel (Pra), and the green subpixel The intensities of the green light Lg converted by the green phosphor layer 22ge provided in (Pga) can be made uniform.

As described above, according to the liquid crystal display device 100e of the present embodiment, in each of the red and green sub-pixels (Pra and Pga), the red light Lr is obtained by wavelength conversion by the red phosphor layer 22re and the green phosphor layer 22ge. Although the intensity of the green light Lg is lower than the incident intensity of the blue light Lb, the intensity of the blue light Ltb transmitted through the blue transmission layer 22be provided in the blue subpixel (Pba) in the light adjustment unit 22e is low. The intensity of the blue light Lb incident on the red phosphor layer 22re provided in the red subpixel (Pra) and the intensity of the blue light Lb incident on the green phosphor layer 22ge provided in the green subpixel (Pga) Since the intensity is lower than the intensity, the intensity of the blue light Ltb transmitted through the blue transmission layer 22be provided in the blue sub-pixel (Pba) in the light adjustment unit 22e, red The intensity of the red light Lr converted by the red phosphor layer 22re provided in the sub-pixel (Pra) and the green light Lg converted by the green phosphor layer 22ge provided in the green sub-pixel (Pga) The strength can be made uniform. As a result, red light Lr, green light Lg, and blue light Ltb are incident on the red, green, and blue sub-pixels (Pra, Pga, and Pba) arranged on the liquid crystal display panel 50a with the same intensity. In the image display performed by adjusting the transmittance of the red light Lr, the green light Lg, and the blue light Ltb transmitted through the liquid crystal display panel 50a for each sub-pixel (Pra, Pga, and Pba), Blueness of color can be suppressed. In the liquid crystal display device 100e, since the white balance can be adjusted by suppressing the blue color of the display color, the blue color of the display color can be suppressed and an appropriate white balance can be obtained.

Further, according to the liquid crystal display device 100e of the present embodiment, the light adjusting unit 22e is provided with the partition wall 23a that separates the red fluorescent layer 22re, the green fluorescent layer 22ge, and the blue transmissive layer 22be. Color mixing among the red light Lr converted by the fluorescent layer 22re, the green light Lg converted by the green fluorescent layer 22ge, and the blue light Ltb transmitted through the blue transmission layer 22be can be suppressed.

Further, according to the liquid crystal display device 100e of the present embodiment, since the light adjusting unit 22e is provided with the light shielding layer 21e so as to overlap the partition wall 23a, the red light Lr converted by the red fluorescent layer 22re, green The color mixture between the green light Lg converted by the fluorescent layer 22ge and the blue light Ltb transmitted through the blue transmission layer 22be can be suppressed by the partition wall 23b, and the blue transmission provided in the blue subpixel (Pba) can be suppressed. The intensity of the blue light Ltb that passes through the layer 22be is the same as the intensity of the blue light Lb that is incident on the red phosphor layer 22re provided in the red subpixel (Pra), and the green that is provided in the green subpixel (Pga). It can be made lower than the intensity of the blue light Lb incident on the phosphor layer 22ge.

In addition, according to the liquid crystal display device 100e of the present embodiment, when the light shielding layer 21e overlapping the partition wall 23b has light reflectivity, the blue light Lb from the backlight 70a has a space between the light shielding layers 21e. Since the blue light Lrb that has not passed through the light is sequentially reflected and reused by the reflection sheet provided on the light shielding layer 21e and the backlight 70a, the utilization efficiency of the blue light Lb from the backlight 70a can be improved. .

Embodiment 6 of the Invention
FIG. 11 is a cross-sectional view of the liquid crystal display device 100f of this embodiment.

In the fifth embodiment, the liquid crystal display device 100e in which the partition wall 23a is provided above the light shielding layer 21e is illustrated, but in this embodiment, the liquid crystal display device 100f in which the partition wall 23b is provided below the light shielding layer 21f is illustrated. To do.

Specifically, as shown in FIG. 11, the liquid crystal display device 100f includes a liquid crystal display panel 50a in which a plurality of pixels (Pa) are arranged in a matrix, and a front surface (upper surface in the figure) and a rear surface ( A pair of

polarizing plates

51a and 51b attached to the back surface and the bottom surface in the drawing, a backlight 70a provided on the back side of the liquid crystal display panel 50a, and a polarizing plate 51b attached to the liquid crystal display panel 50a ) And a backlight 70a, and a phosphor substrate 60f including a light adjusting unit 22f for adjusting the blue light Lb from the backlight 70a and supplying it to the liquid crystal display panel 50a.

As shown in FIG. 11, the phosphor substrate 60f includes an insulating substrate 10c and a light adjusting unit 22f provided on the insulating substrate 10c.

As shown in FIG. 11, the light adjusting unit 22f includes a red phosphor provided between the barrier ribs 23b provided in a grid pattern on the insulating substrate 10c and the barrier ribs 23b so as to overlap the red sub-pixel (Pra). A blue color provided between the green phosphor layer 22gf provided between the barrier rib 23b so as to overlap the layer 22rf and the green subpixel (Pga), and a blue color provided between the barrier rib 23b so as to overlap the blue subpixel (Pba). A transmissive layer 22bf and a light shielding layer 21f provided on the partition wall 23b are provided.

The partition wall 23b is a transparent resin layer (thickness of about 10 μm to several tens of μm).

As shown in FIG. 11, the light shielding layer 21f has an opening (Ar) provided so as to overlap the red subpixel (Pra) and an opening (Ag) provided so as to overlap the green subpixel (Pgb). ) And an opening (Ab) provided so as to overlap with the blue sub-pixel (Pbb). Here, the area of the opening (Ab) that overlaps the blue subpixel (Pba) is the opening (Ar) that overlaps the red subpixel (Pra) and the opening (Ag) that overlaps the green subpixel (Pga). ) Is about 1/20 to 1/2 of each area. The light shielding layer 21f may have light reflectivity.

As shown in FIG. 11, the red phosphor layer 22rf is a transparent resin layer (thickness of about 10 μm to several tens of μm) in which a phosphor for converting blue light Lb from the backlight 70a into red light Lr is dispersed. is there.

As shown in FIG. 11, the green phosphor layer 22gf is a transparent resin layer (thickness of about 10 μm to several tens of μm) in which a phosphor for converting the blue light Lb from the backlight 70a into the green light Lg is dispersed. is there.

As shown in FIG. 11, the blue transmissive layer 22bf is a transparent resin layer (thickness of about 10 μm to several tens of μm) configured to transmit part of the blue light Lb from the backlight 70a as the blue light Ltb. .

Here, as described above, in the light shielding layer 21f of the light adjustment unit 22f, the opening area overlapping the blue subpixel (Pba) is 1 / of the opening area overlapping the red and green subpixels (Pra and Pga). Since it is about 20 to 1/2, depending on the area ratio of each opened portion of the light shielding layer 21f overlapping the red subpixel (Pra), the green subpixel (Pga), and the blue subpixel (Pba), In the light adjustment unit 22f, the intensity of the blue light Ltb that passes through the blue transmission layer 22bf provided in the blue subpixel (Pba) is incident on the red phosphor layer 22rf provided in the red subpixel (Pra). The intensity of the blue light Lb and the intensity of the blue light Lb incident on the green phosphor layer 22gf provided in the green sub-pixel (Pga) are about 1/20 to 1/2. Sub-pixel The intensity of the blue light Ltb transmitted through the blue transmission layer 22bf provided in Pba), the intensity of the red light Lr converted by the red phosphor layer 22rf provided in the red subpixel (Pra), and the green subpixel The intensities of the green light Lg converted by the green phosphor layer 22gf provided in (Pga) can be made uniform.

As described above, according to the liquid crystal display device 100f of the present embodiment, in each of the red and green sub-pixels (Pra and Pga), the red light Lr is obtained by wavelength conversion using the red phosphor layer 22rf and the green phosphor layer 22gf. Although the intensity of the green light Lg is lower than the incident intensity of the blue light Lb, the intensity of the blue light Ltb transmitted through the blue transmission layer 22bf provided in the blue subpixel (Pba) in the light adjustment unit 22f is low. The intensity of the blue light Lb incident on the red phosphor layer 22rf provided in the red sub-pixel (Pra) and the intensity of the blue light Lb incident on the green phosphor layer 22gf provided in the green sub-pixel (Pga) Since the intensity is lower than the intensity, the intensity of the blue light Ltb transmitted through the blue transmission layer 22bf provided in the blue sub-pixel (Pba) in the light adjustment unit 22f, red Of the red light Lr converted by the red phosphor layer 22rf provided in the sub-pixel (Pra) of the green light and the green light Lg converted by the green phosphor layer 22gf provided in the green sub-pixel (Pga) The strength can be made uniform. As a result, red light Lr, green light Lg, and blue light Ltb are incident on the red, green, and blue sub-pixels (Pra, Pga, and Pba) arranged on the liquid crystal display panel 50a with the same intensity. In the image display performed by adjusting the transmittance of the red light Lr, the green light Lg, and the blue light Ltb transmitted through the liquid crystal display panel 50a for each sub-pixel (Pra, Pga, and Pba), Blueness of color can be suppressed. In the liquid crystal display device 100f, since the white balance can be adjusted by suppressing the blue color of the display color, the blue color of the display color can be suppressed and an appropriate white balance can be obtained.

Further, according to the liquid crystal display device 100f of the present embodiment, the light adjusting unit 22f is provided with the partition wall 23b that separates the red fluorescent layer 22rf, the green fluorescent layer 22gf, and the blue transmissive layer 22bf. Color mixing between the red light Lr converted by the fluorescent layer 22rf, the green light Lg converted by the green fluorescent layer 22gf, and the blue light Ltb transmitted through the blue transmission layer 22bf can be suppressed.

Further, according to the liquid crystal display device 100f of the present embodiment, since the light adjusting unit 22f is provided with the light shielding layer 21f so as to overlap the partition wall 23b, the red light Lr converted by the red fluorescent layer 22rf, green The color mixture between the green light Lg converted by the phosphor layer 22gf and the blue light Ltb transmitted through the blue transmission layer 22bf can be suppressed by the partition wall 23b, and the blue transmission provided in the blue sub-pixel (Pba) can be suppressed. The intensity of the blue light Ltb that is transmitted through the layer 22bf is the same as the intensity of the blue light Lb that is incident on the red phosphor layer 22rf provided in the red subpixel (Pra), and the green that is provided in the green subpixel (Pga). It can be made lower than the intensity of the blue light Lb incident on the phosphor layer 22gf.

In addition, according to the liquid crystal display device 100f of the present embodiment, when the light shielding layer 21f overlapping the partition wall 23b has light reflectivity, the blue light Lb from the backlight 70a has a space between the light shielding layers 21f. Since the blue light Lrb that has not passed through the light is sequentially reflected and reused by the reflection sheet provided in the light shielding layer 21f and the backlight 70a, the utilization efficiency of the blue light Lb from the backlight 70a can be improved. .

<< Embodiment 7 of the Invention >>
FIG. 12 is a cross-sectional view of the liquid crystal display device 100g of the present embodiment.

In the fifth and sixth embodiments, the liquid

crystal display devices

100e and 100f in which the light shielding layers 21e and 21f are arranged on the

partition walls

23a and 23b are illustrated. However, in the present embodiment, the partition wall 23c has a light shielding property. An example of a liquid crystal display device 100g including

Specifically, as shown in FIG. 12, the liquid crystal display device 100g includes a liquid crystal display panel 50a in which a plurality of pixels (Pa) are arranged in a matrix, and a front surface (upper surface in the figure) and a rear surface ( A pair of

polarizing plates

51a and 51b attached to the back surface and the bottom surface in the drawing, a backlight 70a provided on the back side of the liquid crystal display panel 50a, and a polarizing plate 51b attached to the liquid crystal display panel 50a ) And the backlight 70a, and a phosphor substrate 60g including a light adjusting unit 22g for adjusting the blue light Lb from the backlight 70a and supplying it to the liquid crystal display panel 50a.

As shown in FIG. 12, the phosphor substrate 60g includes an insulating substrate 10c and a light adjusting unit 22g provided on the insulating substrate 10c.

As shown in FIG. 12, the light adjusting unit 22g includes a red phosphor provided between the partition wall 23c provided in a grid pattern on the insulating substrate 10c and the partition wall 23c so as to overlap the red sub-pixel (Pra). The blue color provided between the green phosphor layer 22gg provided between the layer 22rg and the partition 23c so as to overlap the green subpixel (Pga) and the partition 23c provided so as to overlap the blue subpixel (Pba). And a transmissive layer 22bg.

The partition wall 23c is a light-shielding resin layer (thickness of about 10 μm to several tens of μm).

As shown in FIG. 12, the red phosphor layer 22rg is a transparent resin layer (thickness of about 10 μm to several tens of μm) in which a phosphor for converting the blue light Lb from the backlight 70a into the red light Lr is dispersed. is there.

As shown in FIG. 12, the green phosphor layer 22gg is a transparent resin layer (thickness of about 10 μm to several tens of μm) in which a phosphor for converting the blue light Lb from the backlight 70a into the green light Lg is dispersed. is there.

As shown in FIG. 12, the blue transmissive layer 22bg is a transparent resin layer (thickness of about 10 μm to several tens of μm) configured to transmit part of the blue light Lb from the backlight 70a as the blue light Ltb. .

Here, as described above, in the partition wall 23c of the light adjusting unit 22g, the opening area overlapping the blue subpixel (Pba) is 1/20 of the opening area overlapping the red and green subpixels (Pra and Pga). Since it is about ½, the light adjustment is performed according to the area ratio of each opened portion of the partition wall 23c overlapping the red subpixel (Pra), the green subpixel (Pga), and the blue subpixel (Pba). In the portion 22g, the intensity of the blue light Ltb transmitted through the blue transmission layer 22bg provided in the blue subpixel Pba is equal to the intensity of the blue light Lb incident on the red phosphor layer 22rg provided in the red subpixel Pra. And about 1/20 to 1/2 of the intensity of the blue light Lb incident on the green phosphor layer 22gg provided in the green subpixel Pga, and is provided in the blue subpixel (Pba) in the light adjustment unit 22g. The intensity of the blue light Ltb transmitted through the blue transmission layer 22bg, the intensity of the red light Lr converted by the red phosphor layer 22rg provided in the red subpixel (Pra), and the green subpixel (Pga) The intensity of the green light Lg converted by the provided green phosphor layer 22gg can be made uniform.

As described above, according to the liquid crystal display device 100g of the present embodiment, in each of the red and green subpixels (Pra and Pga), the red light Lr is obtained by wavelength conversion using the red phosphor layer 22rg and the green phosphor layer 22gg. Although the intensity of the green light Lg is lower than the incident intensity of the blue light Lb, the intensity of the blue light Ltb transmitted through the blue transmission layer 22bg provided in the blue subpixel (Pba) in the light adjustment unit 22g is low. , The intensity of the blue light Lb incident on the red phosphor layer 22rg provided in the red sub-pixel (Pra), and the intensity of the blue light Lb incident on the green phosphor layer 22gg provided in the green sub-pixel (Pga). Since the intensity is lower than the intensity, the intensity of the blue light Ltb transmitted through the blue transmission layer 22bg provided in the blue sub-pixel (Pba) in the light adjustment unit 22g, red The intensity of the red light Lr converted by the red phosphor layer 22rg provided in the sub-pixel (Pra) and the green light Lg converted by the green phosphor layer 22gg provided in the green sub-pixel (Pga) The strength can be made uniform. As a result, red light Lr, green light Lg, and blue light Ltb are incident on the red, green, and blue sub-pixels (Pra, Pga, and Pba) arranged on the liquid crystal display panel 50a with the same intensity. In the image display performed by adjusting the transmittance of the red light Lr, the green light Lg, and the blue light Ltb transmitted through the liquid crystal display panel 50a for each sub-pixel (Pra, Pga, and Pba), Blueness of color can be suppressed. In the liquid crystal display device 100g, the white balance can be adjusted by suppressing the bluish color of the display color, so that the appropriate white balance can be obtained by suppressing the bluish color of the display color.

Further, according to the liquid crystal display device 100g of this embodiment, since the partition wall 23c itself has a light shielding property in the light adjusting unit 22g, the red light Lr converted by the red fluorescent layer 22rg and the green fluorescent layer 22gg. The color mixture between the green light Lg converted in step B and the blue light Ltb transmitted through the blue transmission layer 22bg can be suppressed by the partition wall 23c, and the blue subpixel (Pba) can be provided without a separate light shielding layer. ), The intensity of the blue light Ltb that passes through the blue transmission layer 22bg provided in the red sub-pixel (Pra), the intensity of the blue light Lb that enters the red phosphor layer 22rg provided in the red sub-pixel (Pra), and the green sub-pixel ( Pga) can be lower than the intensity of the blue light Lb incident on the green phosphor layer 22gg provided in Pga).

<< Embodiment 8 of the Invention >>
FIG. 13 is a cross-sectional view of the liquid crystal display device 100h of this embodiment.

In each of the above embodiments, the liquid crystal display devices 100a to 100g including the edge-light type backlight 70a are illustrated, but in this embodiment, the liquid crystal display device 100h including the direct type backlight 70b is illustrated.

Specifically, as shown in FIG. 13, the liquid crystal display device 100h includes a liquid crystal display panel 50a in which a plurality of pixels (Pa) are arranged in a matrix, and a front surface (upper surface in the drawing) and a rear surface ( A pair of

polarizing plates

51a and 51b attached to the back surface and the bottom surface in the drawing, a backlight 70b emitting blue light Lb provided on the back side of the liquid crystal display panel 50a, and a liquid crystal display panel 50a And a phosphor substrate 60a including a light adjusting unit 22a that is provided between the polarizing plate 51b) and the backlight 70b and adjusts the blue light Lb from the backlight 70b and supplies the blue light Lb to the liquid crystal display panel 50a. ing.

The backlight 70b is provided above the reflection sheet (not shown) and the reflection sheet, and is integrally provided above each of the point light sources (not shown) that emit blue light and the point light sources. A diffusion sheet (not shown) and a prism sheet (not shown) provided on the diffusion sheet are provided, and blue light from each point light source is converted into blue light Lb (via the reflection sheet, the diffusion sheet, and the prism sheet). The light is emitted as shown in FIG. Here, the point light source is configured by a blue LED or the like.

As described above, according to the liquid crystal display device 100h of the present embodiment, similarly to the first embodiment, the light adjustment unit 22a transmits the blue transmission layer 22ba provided in the blue subpixel (Pba). The intensity of the blue light Ltb is in the intensity of the blue light Lb incident on the red phosphor layer 22ra provided in the red sub-pixel (Pra) and the green phosphor layer 22ga provided in the green sub-pixel (Pga). Since it is lower than the intensity of the incident blue light Lb, it is possible to suppress the bluish color of the display color and obtain an appropriate white balance.

In the present embodiment, the configuration in which the backlight 70a of the liquid crystal display device 100a of the first embodiment is replaced with the direct type backlight 70b is exemplified. However, the backlight of the liquid crystal display devices 100b to 100g of the second to seventh embodiments is exemplified. The light 70a may be replaced with a direct backlight 70b.

In the fifth to seventh embodiments, the light adjustment unit having a partition is provided for the liquid crystal display panel 50a in which the red, green, and blue sub-pixels Pra, Pga, and Pba are formed with the same size. Although the liquid crystal display device has been exemplified, the light adjustment unit having the partition is provided for the liquid crystal display panel 50b in which the blue subpixel Pbb is formed smaller than the red subpixel Prb and the green subpixel Pgb. May be.

Further, in each of the above embodiments, the liquid crystal display device including the TFT substrate is exemplified, but the present invention is also applied to a liquid crystal display device including other active matrix substrates, a liquid crystal display device of a passive matrix driving system, and the like. can do.

In each of the above embodiments, a liquid crystal display device including a CF substrate provided with a red layer, a green layer, a blue layer, and the like has been exemplified. However, the present invention is not limited to the red layer, the green layer, and the blue layer on the CF substrate. It can also be applied to a liquid crystal display device in which is omitted.

As described above, the present invention is useful for a liquid crystal display device because an appropriate white balance can be obtained by suppressing blueness of a display color caused by a backlight emitting blue light.

Pa, Pb Pixels Pra, Prb Red subpixels Pga, Pgb Green subpixels Pba, Pbb Blue subpixels 21a-21c, 21e, 21f Light shielding layers 22a-22g Light adjustment units 22ra-22rg Red phosphor layers 22ga-22gg Green phosphor layers 22ba-22bg Blue transmission layers 23a-

23c Partition walls

50a, 50b Liquid

crystal display panels

70a, 70b Backlights 100a-100h Liquid crystal display device

Claims

A liquid crystal display panel in which red, green and blue sub-pixels constituting the pixel are arranged;
A backlight provided on the back side of the liquid crystal display panel and emitting blue light;
A light adjusting unit provided between the liquid crystal display panel and the backlight, and adjusting the blue light incident from the backlight and supplying the blue light to the liquid crystal display panel;
The light adjusting unit is provided so as to overlap the red sub-pixel and converts the incident blue light into red light; and the incident blue light provided so as to overlap the green sub-pixel A green phosphor layer that converts the light into green light, and a blue transmission layer that is provided so as to overlap the blue sub-pixel and that transmits the incident blue light,
The light adjusting unit is configured such that the intensity of blue light transmitted through the blue transmission layer is lower than the intensity of each blue light incident on the red phosphor layer and the green phosphor layer. Liquid crystal display device.
The liquid crystal display device according to claim 1,
The light adjusting unit includes a light shielding layer that is opened so as to overlap the red, green, and blue sub-pixels,
The liquid crystal display device according to claim 1, wherein an area of the light-shielding layer that is opened so as to overlap with the blue sub-pixel is smaller than an area of the light-shielding layer that is opened so as to overlap with the red and green sub-pixels.
The liquid crystal display device according to claim 2,
The liquid crystal display device, wherein the light shielding layer has light reflectivity.
The liquid crystal display device according to claim 2 or 3,
A liquid crystal display device, wherein an area opened so as to overlap with the blue sub-pixel is ½ or less of an area opened so as to overlap with each of the red and green sub-pixels.
The liquid crystal display device according to claim 1 or 2,
The liquid crystal display device, wherein the blue sub-pixel is formed smaller than the red and green sub-pixels.
The liquid crystal display device according to claim 1,
The liquid crystal display device, wherein the light adjustment unit includes a light shielding layer provided in the blue subpixel and having an opening in the blue subpixel.
The liquid crystal display device according to claim 1,
The liquid crystal display device, wherein the light adjusting unit is provided with a partition for separating the red fluorescent layer, the green fluorescent layer, and the blue transmitting layer.
The liquid crystal display device according to claim 7,
The liquid crystal display device, wherein the light adjusting portion is provided with a light shielding layer so as to overlap the partition wall.
The liquid crystal display device according to claim 8, wherein
The liquid crystal display device, wherein the light shielding layer has light reflectivity.
The liquid crystal display device according to claim 7,
The liquid crystal display device, wherein the partition wall has a light shielding property.