JP7735772B2 - Liquid crystal display device and color filter substrate - Google Patents

Description

The present invention relates to a liquid crystal display device that divides the display screen into multiple areas and controls the backlight intensity for each area to display the screen.

The method of dividing the display screen of an LCD device into multiple areas and controlling the backlight intensity for each area to display the screen is known as local dimming technology, and is described, for example, in Patent Documents 1 to 3.

By controlling the light intensity for each area in this way, the light emitted from the light-emitting element can be effectively utilized, improving its light utilization efficiency. For the same reason, heat generation by the light-emitting element can be prevented, preventing deterioration of peripheral components close to the light-emitting element.

However, even with this local dimming technology, the light utilization efficiency was still insufficient, and there was still room for improvement.

International Publication No. 2017/191714 JP 2015-64391 A International Publication No. 2019/244351

The present invention therefore aims to provide a liquid crystal display device that further improves the light utilization efficiency of the light source light from the backlight's light-emitting elements.

A display device according to a first aspect of the present invention is a liquid crystal display device comprising a color filter substrate, a liquid crystal drive substrate, a backlight module, and a liquid crystal layer, wherein a display screen is divided into a plurality of display areas, and the backlight module is driven for each display area to control the intensity of light emitted from the backlight module, and a liquid crystal layer is disposed between the color filter substrate and the liquid crystal drive substrate, and the liquid crystal layer is driven for each pixel to control the transmission of light from the backlight module to display on the screen,
the color filter substrate includes a black matrix and a light-reflective matrix;
the black matrix has openings corresponding to the pixels, and colored filters are disposed in the openings;
The liquid crystal display device is characterized in that the light-reflecting matrix is located at the boundary between the display areas.

The liquid crystal display device according to the present invention can be a liquid crystal display device that includes a plurality of the pixels within the display area.

Furthermore, the liquid crystal display device according to the present invention may be a liquid crystal display device in which the light-reflective matrix has a light-reflective thin film on its surface.

The liquid crystal display device according to the present invention may be a liquid crystal display device in which the light-reflective thin film is covered with a transparent resin protective layer.

Furthermore, the liquid crystal display device according to the present invention can be a liquid crystal display device in which the light-reflective thin film is made of a metal thin film of aluminum or an aluminum alloy.

Furthermore, the liquid crystal display device according to the present invention can be a liquid crystal display device in which the light-reflective thin film has a three-layer structure, the middle layer of which is made of a metal thin film of silver or a silver alloy.

Furthermore, the liquid crystal display device according to the present invention can be a liquid crystal display device in which the backlight module is configured by arranging multiple light-emitting units, each of which corresponds to a respective one of the display areas.

Furthermore, the liquid crystal display device according to the present invention can be a liquid crystal display device in which multiple light-emitting elements are arranged inside the light-emitting unit.

Furthermore, the liquid crystal display device according to the present invention can be a liquid crystal display device in which the light-emitting element is a light-emitting element that emits monochromatic light in blue or near-ultraviolet.

Furthermore, the liquid crystal display device according to the present invention may be a liquid crystal display device in which the light-emitting elements are LEDs.

The liquid crystal display device according to the present invention may also have a wavelength conversion layer between the light-emitting element and the colored filter that converts the light emitted by the light-emitting element into green light or red light.

Furthermore, the liquid crystal display device according to the present invention can be a liquid crystal display device in which the color filter substrate is provided with a light scattering layer, and this light scattering layer is made of a dispersion in which transparent particles are dispersed in a transparent resin.

Furthermore, the liquid crystal display device according to the present invention may be a liquid crystal display device in which the light scattering layer contains an ultraviolet absorber.

The liquid crystal display device according to the present invention can also be a liquid crystal display device in which spacers are laminated on the light-reflective matrix, and the gap between the color filter substrate and the liquid crystal drive substrate is controlled by these spacers.

Further, the color filter substrate according to the present invention is a color filter substrate for a liquid crystal display device,
The display device is configured with a black matrix and a light-reflective matrix,
the black matrix has openings corresponding to pixels of a display screen, and colored filters are disposed in the openings;
The color filter substrate is characterized in that the light-reflecting matrix is located at the boundary between display areas each including a plurality of the pixels.

The present invention has the effect of further improving the light utilization efficiency of light from the light source emitted by the backlight's light-emitting elements in a liquid crystal display device that uses local dimming technology.

FIG. 1 is an explanatory cross-sectional view of a liquid crystal display device according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view illustrating a color filter substrate according to the first embodiment of the present invention. FIG. 3 is a partial plan view of a color filter substrate according to the first embodiment of the present invention, illustrating the arrangement of pixels and display areas. FIG. 4 is a cross-sectional view for explaining the behavior of emitted light in the absence of a light-reflecting matrix. FIG. 5 is a cross-sectional view for explaining the behavior of emitted light when a light-absorbing matrix is provided instead of a light-reflective matrix. FIG. 6 relates to the first embodiment of the present invention and is an explanatory cross-sectional view for explaining the behavior of emitted light when a light-reflecting matrix is provided. FIG. 7 is a cross-sectional view illustrating a liquid crystal driving substrate according to the first embodiment of the present invention. FIG. 8 is a circuit diagram of a driving circuit for driving thin film transistors of a liquid crystal driving substrate according to the first embodiment of the present invention. FIG. 9 is a partial cross-sectional view illustrating a backlight module according to the first embodiment of the present invention. FIG. 10 is a circuit diagram of a driving circuit for a light emitting element of a backlight module according to the first embodiment of the present invention. FIG. 11 is a cross-sectional view for explaining a liquid crystal display device according to a second embodiment of the present invention. FIG. 12 is a partial cross-sectional view illustrating a backlight module according to a second embodiment of the present invention. FIG. 13 is a cross-sectional view illustrating a color filter substrate according to a third embodiment of the present invention.

[First embodiment]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings, in which: Fig. 1 is a cross-sectional view illustrating a liquid crystal display device according to a first embodiment of the present invention;

As shown in FIG. 1, the liquid crystal display device 100 of this first embodiment comprises a color filter substrate 10, a liquid crystal drive substrate 30, a backlight module 40, and a liquid crystal layer 20. The liquid crystal layer 20 is disposed between the color filter substrate 10 and the liquid crystal drive substrate 30.

First, the backlight module 40 is a device that generates the display light necessary for the screen display of the liquid crystal display device 100. For this reason, this backlight module 40 is composed of an array of multiple light-emitting units 40A, each of which contains multiple light-emitting elements made up of blue-emitting LEDs.

Next, the liquid crystal layer 20 is sandwiched between the liquid crystal drive substrate 30 and the color filter substrate 10. The liquid crystal layer 20 is driven by applying or not applying a voltage between the pixel electrodes 35 and common electrode 33 on the liquid crystal drive substrate 30. Polarizing films are provided on the liquid crystal drive substrate 30 and the color filter substrate 10, and the liquid crystal layer 20 controls the polarization plane of linearly polarized light transmitted through the polarizing film of the liquid crystal drive substrate 30. For example, applying a voltage between the pixel electrodes 35 and the common electrode 33 rotates the polarization plane, while not applying a voltage maintains the polarization plane unchanged. Depending on whether the polarization plane is rotated or not, the light is transmitted through the polarizing film of the color filter substrate 10 or is absorbed by the polarizing film, preventing transmission. The rotation of the polarization plane can be controlled for each pixel by controlling whether or not to apply a voltage. The transmitted light transmitted through the polarizing film of the color filter substrate 10 can be used as display light, and this display light can be used to display images on a screen.

Next, this liquid crystal display device is configured to utilize the aforementioned local dimming technology to control the light intensity for each display area to display the screen. For this reason, the color filter substrate 10 has a black matrix located at the boundaries between pixels, as well as a light-reflective matrix located at the boundaries between the display areas.

First, the black matrix is located at the boundary between pixels on the display screen. The pixel electrodes 35 are provided corresponding to these pixel openings, and the liquid crystal layer 20 is controlled for each pixel, for example, by a thin-film transistor provided for each pixel opening. Therefore, the openings (pixel openings) in the black matrix and the areas where the thin-film transistors control the liquid crystal layer 20 correspond to each other, and these areas form the pixels of the display screen.

On the other hand, the light-reflective matrix is positioned at the boundaries between the display areas, and therefore surrounds each display area.

On the other hand, the backlight module is composed of an array of multiple light-emitting units, each of which corresponds to a respective display area. By controlling the intensity of the light source light emitted by each light-emitting unit, the screen brightness can be controlled for each display area.

The light source light emitted from the light-emitting units is incident on the corresponding display area, but because this display area is surrounded by a light-reflective matrix, the light source light traveling in an oblique direction is reflected by the light-reflective matrix. This increases the light utilization efficiency of the light source light emitted from the light-emitting units and also increases the contrast of the display screen. Furthermore, because this light-reflective matrix is difficult for an observer to notice, it is possible to maintain a high quality of the display screen.

Next, the color filter substrate 10, LCD drive substrate 30, and backlight module 40 will be described in detail separately.

(Color filter substrate 10)
FIG. 2 is an explanatory cross-sectional view of the color filter substrate 10 according to the first embodiment of the present invention.

As can be seen from Figure 2, the color filter substrate 10 is composed of a transparent substrate (transparent substrate of the color filter substrate) 11, a black matrix 12, a color filter layer 13, a light-scattering layer 15, a light-reflective matrix 17, spacers 18, and a polarizing film 19. In addition, an alignment film is provided on the color filter substrate 10, but this is not shown in the figure.

In this embodiment, a black matrix 12 is disposed directly on the surface of the transparent substrate 11 facing the liquid crystal 20, and a color filter layer 13 is laminated on top of this black matrix 12. Therefore, when viewed from the display screen side, the color filter layer 13 is not visible in the areas overlapping the black matrix 12; it can only be observed through the openings in the black matrix 12, i.e., the pixel openings. As is well known, the black matrix 12 is positioned at the boundaries between pixels in this way to prevent color mixing and to absorb ambient light incident from the display screen side, improving the contrast of the display screen.

As described above, it is common to first form the black matrix 12 on the transparent substrate 11, and then form the color filter layer 13 on top of this black matrix 12, but it is also possible to form them in the reverse order. That is, the color filter layer 13 is first formed on the transparent substrate 11, and then the color filter layer 13 is formed on top of this color filter layer 13. It is also possible to form two layers of black matrix 12, with the color filter layer 13 sandwiched between these two layers of black matrix 12.

Next, a light-reflective matrix 17 is laminated on top of the color filter layer 13, with a transparent planarization layer 14 interposed between them. A light-scattering layer 15 is provided in the openings of the light-reflective matrix 17. In this embodiment, a transparent resin layer 16 is laminated on top of the light-scattering layer 15, but this transparent resin layer 16 is not an essential component. Spacers 18 are erected on top of the light-reflective matrix 17. These spacers 18 maintain a constant and uniform gap between the color filter substrate 10 and the liquid crystal drive substrate 30. Liquid crystal 20 is disposed in this gap, and the spacers 18 serve to maintain a constant and uniform thickness of the liquid crystal 20.

In addition, a polarizing film 19 is laminated on the side of the transparent substrate 11 opposite the liquid crystal 20 side, i.e., on the side facing the screen observer.

<Transparent substrate 11 of color filter substrate>
The transparent substrate 11 of the color filter substrate is a transparent substrate through which display light emitted from the liquid crystal display device 100 passes toward the viewer, and its surface constitutes the display screen. The transparent substrate 11 of the color filter substrate may be, for example, a glass substrate, a quartz substrate, a sapphire substrate, or a plastic substrate such as a polyester film or a polyimide film. The higher the transmittance of the substrate for visible light, the more preferable it is. For example, the transmittance of the transparent substrate 11 of the color filter substrate may be 50% or more and 100% or less, and more preferably 90% or more and 100% or less.

<Black Matrix 12>
The black matrix 12 has a lattice shape, and this lattice-shaped black matrix 12 is located at the boundaries between pixels of the display screen, and its openings correspond to the pixels of the display screen. For this reason, as mentioned above, in this specification, the openings of this lattice-shaped black matrix 12 are called "pixel openings."

The black matrix 12 can be formed by dispersing black pigments with visible light absorption properties, such as carbon black or titanium black, in a resin. In addition to these black pigments, organic pigments such as blue pigments may also be added.

<Color filter layer 13>
The color filter layer 13 is composed of an arrangement of colored filters ₁₃₁₁ , ₁₃₁₂ , ... each having a different color. The colored filters ₁₃₁₁ , ₁₃₁₂ , ... color the display light that passes through them and determine the color of the display screen. For this reason, colored filters of the three primary colors of light (red, green, and blue) are usually used, and these colored filters ₁₃₁₁ , ₁₃₁₂ , ... are arranged in the pixel openings.

In this embodiment, each colored filter has a linear shape extending in the direction perpendicular to the drawing (Y direction), and therefore, each of the colored filters 13 ₁₁ , 13 ₁₂ , ... intersects with the black matrix 12 and overlaps with the black matrix 12 at the intersection positions, but since they do not overlap with the black matrix 12 at the pixel openings, for convenience of explanation, the colored filters corresponding to each pixel opening are given the symbols "13 ₁₁ ", "13 ₁₂ ", .... Therefore, these symbols not only indicate the pixel openings and pixels, but also the colored filters arranged in the pixel openings.

These colored filters 13 ₁₁ , 13 ₁₂ , etc. can be formed by dispersing an organic pigment in a transparent photosensitive resin such as acrylic or its precursor, applying the resin, and then exposing and developing the resin.

Examples of red organic pigments that can be used in red colored filters (red filters) include C.I. Pigment Red 7, 14, 41, 48:2, 48:3, 48:4, 81:1, 81:2, 81:3, 81:4, 146, 168, 177, 178, 179, 184, 185, 187, 200, 202, 208, 210, 246, 254, 255, 264, 270, 272, and 279. Red filters can also use yellow or orange pigments in addition to red pigments.

Examples of yellow pigments include C.I. Pigment Yellow 1, 2, 3, 4, 5, 6, 10, 12, 13, 14, 15, 16, 17, 18, 24, 31, 32, 34, 35, 35:1, 36, 36:1, 37, 37:1, 40, 42, 43, 53, 55, 60, 61, 62, 63, 65, 73, 74, 77, 81, 83, 93, 94, 95, 97, 98, 100, 101, 104, 106, 108, 109, 110, 113, 114, 115, 116, 1 Examples include 17, 118, 119, 120, 123, 126, 127, 128, 129, 147, 151, 152, 153, 154, 155, 156, 161, 162, 164, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 179, 180, 181, 182, 187, 188, 193, 194, 199, 198, 213, and 214.

Examples of green organic pigments that can be used in green colored filters (blue filters) include C.I. Pigment Green 7, 10, 36, and 37. Furthermore, halogenated zinc phthalocyanine green pigments and halogenated aluminum phthalocyanine green pigments can also be suitably used in green filters.

Green colored filters (green filters) can also use the aforementioned yellow pigment in addition to green pigment.

Examples of blue organic pigments that can be used in blue filters include C.I. Pigment Blue 15, 15:1, 15:2, 15:3, 15:4, 15:6, 16, 22, 60, and 64.

In addition to blue pigments, violet pigments can also be used in blue filters. Examples of violet pigments include C.I. Pigment Violet 1, 19, 23, 27, 29, 30, 32, 37, 40, 42, and 50.

The transparent photosensitive resin in which these organic pigments are dispersed is preferably a transparent resin with a transmittance of 90% or more in the visible range, and more preferably an alkali-soluble photosensitive resin containing a resin precursor.

Examples of such transparent photosensitive resins include resins in which a linear polymer having reactive substituents such as hydroxyl groups, carboxyl groups, or amino groups is reacted with a (meth)acrylic compound or cinnamic acid having reactive substituents such as isocyanate groups, aldehyde groups, or epoxy groups, to introduce photocrosslinkable groups such as (meth)acryloyl groups or styryl groups into the linear polymer.

Furthermore, examples of monomers and oligomers that are precursors of transparent resins include various acrylic acid esters and methacrylic acid esters such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, cyclohexyl (meth)acrylate, polyethylene glycol di(meth)acrylate, pentaerythritol tri(meth)acrylate, trimethylolpropane tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, tricyclodecanyl (meth)acrylate, melamine (meth)acrylate, and epoxy (meth)acrylate, as well as (meth)acrylic acid, styrene, vinyl acetate, (meth)acrylamide, N-hydroxymethyl (meth)acrylamide, and acrylonitrile. These may be used alone or in combination of two or more.

These pigments are then mixed with a transparent photosensitive resin or its precursor in a range of 15% to 60% by mass to form a coating liquid, which is then applied to the black matrix 12 to form a coating film, and then exposed to light through a photomask, followed by development with an alkaline solution, thereby forming the colored filters 13 ₁₁ , 13 ₁₂ , ...

<Light-reflecting matrix 17>
As described above, the light-reflective matrix 17 is laminated on the surface of the color filter layer 13 facing the liquid crystal 20. Since the color filter layer 13 is composed of a set of linear colored filters extending in the direction perpendicular to the plane of the drawing (Y direction), it is desirable to provide a planarizing layer 14 on the color filter layer 13 and then provide the light-reflective matrix 17 on the planarizing layer 14. The planarizing layer 14 can be made of a transparent resin with small optical anisotropy.

The light-reflective matrix 17 is located at the boundary between the display areas. On the other hand, the black matrix 12 is located at the boundary between the pixels of the display screen. The positional relationship between the light-reflective matrix 17 and the black matrix 12, as well as the positional relationship between the display area and the pixels, will be explained with reference to Figure 3. Figure 3 is an explanatory partial plan view of the color filter substrate to explain the arrangement of the pixels and display area in the first embodiment.

As shown in FIG. 3, the display area (Area) is rectangular and surrounded by a light-reflective matrix 17. The length Ax of the display area (Area) in the X direction is, for example, 5 to 500 μm, and the length Ay in the Y direction is, for example, 15 to 1500 μm.

The display area "Area" includes a plurality of pixel openings, which are arranged in a matrix. Of the pixel openings included in this Area, those belonging to the first row are given the reference numerals ₁₃₁₁ , ₁₃₁₂ , ..., _131n . That is, n pixel openings are lined up in the X direction. Of the pixel openings included in Area1, those belonging to the first column are given the reference numerals ₁₃₂₁ , ₁₃₃₁ , ..., _13m1 . That is, m pixel openings are lined up in the Y direction. Therefore, this Area includes m x n pixel openings. For example, if 64 pixel openings each having a red filter (red pixels), 64 pixel openings each having a green filter (green pixels), and 64 pixel openings each having a blue filter (blue pixels) are arranged in the X direction, for a total of 64 x 3 = 192 pixel openings, and 64 pixel openings are arranged in the Y direction, then this Area will include 64 x 192 = 12,288 pixel openings.

Incidentally, a display device called 4K has 11,520 pixel apertures in the X direction and 2,160 in the Y direction. Therefore, a 4K display device has 11,520 x 2,160 = approximately 25 million pixel apertures. Therefore, when 12,288 pixel apertures are assigned to one display area, the number of display areas is 25 million / 12,288 = ≈ 2,000. In other words, in this case, the display screen is 2,000 pixels wide.
The display is divided into 00 display areas, and a light-emitting unit (described later) is assigned to each display area. By controlling the light-emitting intensity of this light-emitting unit, the intensity of the light source light can be changed for each display area. The number of light-emitting units required is 2,000.

Also, if 49,152 pixel openings are assigned to one display area, the number of display areas will be approximately 500. In this case, approximately 500 light-emitting units can be assigned to each display area, and the light emission intensity of the light-emitting units can be controlled to control the intensity of the light source light for each display area.

The light-reflective matrix 17 can be constructed by providing a light-reflective thin film ₁₇₂ so as to cover the surface of a substrate _171. Furthermore, a transparent resin protective layer may be provided on the light-reflective thin film ₁₇₂ .

The base material ₁₇₁ can be made of resin and may be transparent or opaque. In this embodiment, as shown in FIG. 2, the base is wide.

The light-reflective thin film ₁₇₂ can be made of a single-layer or multi-layer thin film, and its thickness may be, for example, 0.15 to 0.8 μm.

The single-layer light-reflective thin film ₁₇₂ can be, for example, a metal thin film made of aluminum or an aluminum alloy. Examples of aluminum alloys that can be used include high-melting-point metals such as molybdenum and titanium, rare earth elements such as neodymium, and aluminum alloys containing a small amount of silicon. From the perspective of reflectivity, an aluminum alloy containing 0.2 to 3 mass% neodymium is preferred. If the neodymium content is less than 0.2 mass%, the aluminum crystals tend to become coarse or hillocks form, resulting in a decrease in light reflectivity. Furthermore, if the neodymium content exceeds 3 mass%, the light reflectivity also tends to decrease. In contrast, a high reflectivity can be stably reproduced when the neodymium content is in the range of 0.2 mass% to 3 mass%.

Alternatively, a metal thin film of silver or a silver alloy may be used as the single-layer light-reflective thin film _172. When using such a metal thin film of silver or a silver alloy, it is preferable to use a three-layer light-reflective thin film ₁₇₂ in which the silver or silver alloy metal thin film serves as an intermediate layer and conductive oxide thin films are disposed on both sides of the intermediate layer. A preferred conductive oxide thin film is a mixed oxide containing a first metal oxide material made of indium oxide and a second metal oxide material made of an oxide of a metal element that does not substantially have a solid solubility range with silver. Examples of metal elements that do not substantially have a solid solubility range with silver include titanium, zirconium, tantalum, niobium, hafnium, cerium, bismuth, germanium, silicon, and chromium.

Furthermore, these light-reflective thin films ₁₇₂ can also be laminated on the substrate ₁₇₁ with a titanium nitride thin film or titanium thin film interposed between them.

4 to 6 explain the effects of the presence or absence of the light-reflecting thin film ₁₇₂ and the differences in its structure.

Figure 4 is an explanatory cross-sectional view of the case where there is no light-reflective matrix, showing a virtual matrix 17o placed in the position where the light-reflective matrix 17 described below would be placed.

4, in the absence of a light-reflecting matrix, diagonal diffused light L1 and L2 pass through the virtual matrix 17o in the direction of the arrows. Therefore, for example, diffused light L1 invades from display area Area1 into adjacent display area Area2. On the other hand, diffused light L1 invades from display area Area1 into adjacent display area Area2. In this way, light invades the adjacent display area from the display area through which it should travel, and this invading light becomes stray light, reducing the contrast of the displayed image.

Figure 5 is an explanatory cross-sectional view of a case where a light-absorbing matrix 17a is provided instead of the light-reflective matrix 17.

Diffused light L3 and L4 that diffuses diagonally within the light-scattering layer 15 is absorbed by the light-absorbing matrix 17a. As a result, light does not invade adjacent display areas, and there is no reduction in contrast due to invading stray light. However, in this case, even though local dimming technology is used to improve light utilization efficiency, the light source light generated by the backlight is absorbed by the light-absorbing matrix 17a, resulting in a decrease in spectral utilization efficiency. Furthermore, because light transmission and reflection are suppressed near the light-absorbing matrix 17a, the light-absorbing matrix 17a can be easily seen or recognized by the screen observer. This means that the matrix pattern is always displayed on the display screen.

Next, as shown in FIG. 6, when a light-reflective matrix 17 is provided, the diagonal diffused light beams L5 and L7 are each reflected by the light-reflective matrix 17. That is, diffused light beam L5 traveling from display area Area1 toward adjacent display area Area2 is reflected by the light-reflective matrix 17, and the resulting reflected light beam L6 returns to display area Area1. Similarly, diffused light beam L7 traveling from display area Area2 toward adjacent display area Area1 is reflected by the light-reflective matrix 17, and the resulting reflected light beam L8 returns to display area Area2. These diffused light beams L5 and L7 do not invade adjacent display areas and do not become stray light, reducing the contrast of the displayed image. Furthermore, because the light-reflective matrix 17 does not absorb light, it does not reduce the light utilization efficiency of the light source light generated by the backlight. Furthermore, the reflected light beams L6 and L8 are essentially the same as the diffused light beams L1 and L2 (see FIG. 4) when no light-reflective matrix is provided. This makes it difficult for the screen viewer to recognize the light-reflecting matrix 17, allowing the display quality of the screen to be maintained at a high level.

<Spacer 18>
The spacers 18 maintain a constant gap between the color filter substrate 10 and the liquid crystal drive substrate 30. Since the liquid crystal layer 20 is disposed in this gap, the spacers 18 determine the thickness of the liquid crystal layer 20 and maintain the thickness at a uniform level.

For this purpose, spacers 18 are provided on the light-reflective matrix 17, the height of which is equal to the thickness of the liquid crystal layer 20.

Note that, as shown in the figure, the spacers 18 do not need to be provided over the entire surface of the light-reflective matrix 17. It is sufficient to provide them only on a portion of it.

The method for forming the spacers 18 is well known. For example, the spacers 18 can be formed by using a negative photoresist, applying it, exposing it to light in a pattern, and developing it.

<Light scattering layer 15>
As shown in FIG. 2, the light-scattering layer 15 is disposed in the openings of the light-reflective matrix 17, and has the function of preventing specular reflection of ambient light incident from the display screen side, thereby preventing a decrease in the contrast of the screen display due to the specular reflection light.

The light-scattering layer 15 can be formed by blending transparent particles into a resin, forming a coating liquid, and then applying this coating liquid. In addition, a dispersing agent or an ultraviolet absorber may also be blended. As described below, the light-scattering layer 15 can also be formed using two resins that have low compatibility and different refractive indices.

Therefore, when constructing light-scattering layer 15 using transparent particles, it is preferable to use particles with a particle diameter larger than the wavelength of visible light as the transparent particles used in light-scattering layer 15. Particles with a particle diameter similar to the wavelength of the visible light that is the target of light scattering have high transmittance to that target visible light and are less likely to cause light scattering. In contrast, when particles with a particle diameter larger than the wavelength of visible light are used, the transmittance to visible light decreases and high light scattering is exhibited.

For these reasons, the transparent particles preferably have an average particle size of 1.0 to 3.0 μm. It is also possible to blend transparent fine particles with an average particle size of around 0.2 μm, or 0.1 μm or less, as the dispersing aid.

It is also desirable that the transparent particles have a refractive index different from that of the resin contained in the light-scattering layer 15. This is because light is scattered when light is reflected or refracted at the interface between the transparent particles and the resin, which have different refractive indices.

It is also desirable that the transparent particles be optically isotropic. This is to maintain the polarization plane of the display light passing through the light-scattering layer 15 without rotating it. An example of such optically isotropic inorganic particles is amorphous silica particles.

In addition, organic particles are generally isotropic, and there are known organic particles with a variety of properties, including refractive index. Examples include particles made from resins such as acrylic, styrene, urethane, nylon, melamine, and benzoguanamine. Of course, these particles can also be used in combination.

Examples of the UV absorber include benzophenone-based compounds, benzotriazole-based compounds, and triazine-based compounds. It is preferable that the UV absorber have a phenolic hydroxyl group. The phenolic hydroxyl group allows crosslinking with compounds having alkoxymethyl groups, methylol groups, or the like during heat treatment. Crosslinking can suppress bleeding of the UV absorber during long-term storage after hardening, improving reliability. The amount of UV absorber added can be, for example, in the range of 0.05 to 10% by mass relative to the resin.

As such, since the light-scattering layer 15 is composed of a dispersion of transparent particles larger than the wavelength of light, it is desirable that its thickness be thicker than the average particle diameter of the transparent particles. For example, it is 1 to 50 μm or less. It can be made thicker than 50 μm, but increasing the thickness beyond 50 μm does not improve scattering properties much. In fact, making it thicker increases the process load, such as wasted work time for coating and drying.

As mentioned above, it is also possible to form a coating liquid by dissolving or dispersing multiple resins with low compatibility and different refractive indices in a solvent, and after applying this coating liquid, by causing phase separation of the resins, a layer with a sea-island structure with different refractive indices can be formed, and this layer can be used as the light-scattering layer 15.

In this embodiment, a transparent resin layer 16 is laminated on the light scattering layer 15, but this transparent resin layer 16 is not necessarily required. When the transparent resin layer 16 is laminated on the light scattering layer 15, it is desirable that the surface of the transparent resin layer 16 and the surface of the light reflective matrix 17 are flush with each other. When the transparent resin layer 16 is not laminated on the light scattering layer 15, it is of course desirable that the surface of the light scattering layer 15 and the surface of the light reflective matrix 17 are flush with each other. When the surface of the light reflective matrix 17 and the surrounding surfaces are flush with each other in this way, it is possible to make the thickness of the liquid crystal layer 20 uniform.

(Liquid crystal drive substrate 30)
7, the liquid crystal driving substrate 30 includes a transparent substrate (transparent substrate of the liquid crystal driving substrate) 31, an insulating layer 32, a common electrode 33, an insulating layer 34, pixel electrodes 35, and a polarizing film 36. In addition, an alignment film (not shown) is provided on the liquid crystal driving substrate 30. The common electrode 33, insulating layer 34, and pixel electrodes 35 may be formed by using the insulating layer 34 as a wiring substrate base material, with the common electrode 33 and pixel electrodes 35 on both sides of the insulating layer 34.

At least one thin-film transistor is connected to each pixel electrode 35, and by driving this thin-film transistor, a voltage can be applied to each pixel electrode 35. By applying a voltage to each pixel electrode 35 in this way, the liquid crystal layer 20 can be driven for each pixel electrode 35, allowing the screen to be displayed.

In this embodiment, the liquid crystal layer 20 is driven by the FFS (fringe field switching) method, which is driven by the fringe electric field between the pixel electrode 35 and the common electrode 33. However, if a VA (vertical alignment) type liquid crystal is used as the liquid crystal layer 20, which is driven by the electric field between the color filter substrate 10 and the liquid crystal drive substrate 30, it is desirable to provide a common electrode on the color filter substrate 10 instead of the common electrode 33, and apply a voltage between this common electrode on the color filter substrate 10 and the pixel electrode 35 on the liquid crystal drive substrate 30.

8 shows a circuit diagram of a circuit for applying a voltage to the pixel electrodes 35. As shown in this diagram, one pixel electrode 35 is electrically connected to one thin film transistor _35T , and one pixel electrode 35 can be controlled by controlling one thin film transistor _35T . In other words, it is possible to control each pixel electrode 35 individually.

In this circuit, upon receiving a video signal from the source line _35S and a selection signal from the gate line _35G , a liquid crystal drive voltage is applied to the pixel electrode 35, driving the liquid crystal layer 20. In the drawing, the symbol " _35CS " indicates a storage capacitance, and the symbol " _35C " indicates a storage capacitance line, but the formation of these storage capacitance _35CS and storage capacitance line _35S may be omitted.

(Backlight module 40)
The backlight module 40 is a device that generates light used for screen display. As shown in FIG. 1 , the backlight module 40 is configured by arranging multiple light-emitting units 40A. Each light-emitting unit 40A corresponds to the display area. The light source light generated by each light-emitting unit 40A is incident on the corresponding display area and used for screen display in that display area. By controlling the light intensity of each light-emitting unit 40A (local dimming drive), it is possible to control the brightness of the display light in the corresponding display area. Therefore, as can be seen from FIG. 1 , the length 40Ax of each light-emitting unit 40A in the X direction is equal to the length Ax of the display area. Furthermore, the length 40Ay of each light-emitting unit 40A in the Y direction is equal to the length Ay of the display area.

9 is an explanatory partial cross-sectional view of the backlight module 40, which includes a single light-emitting unit 40A. As can be seen from FIG. 9, the light-emitting unit 40A is arranged on the backlight module substrate 41, and a plurality of light-emitting elements 43 are arranged in the light-emitting unit 40A.
The number of light-emitting elements 43 varies depending on the area of the corresponding display area and the number of pixel openings included in this display area. Generally, the number of light-emitting elements 43 arranged in one light-emitting unit 40A is smaller than the number of pixel openings included in the corresponding display area. For example, even if the number of pixel openings included in the display area is 12,288 as described above, the number of light-emitting elements 43 arranged in the corresponding light-emitting unit 40A can be 36, with six light-emitting elements 43 arranged in the X direction and six in the Y direction.

As shown in Figures 1 and 9, the backlight module 40 is constructed by arranging light-emitting units 40A on the surface of a substrate (backlight module substrate) 41 facing the liquid crystal drive substrate 30, and then laminating a wavelength conversion layer 44 and a prism sheet 46. In addition to the light-emitting elements 43, the light-emitting units 40A are also equipped with a light-reflective electrode 43a provided on the side opposite the liquid crystal drive substrate 30 and a common electrode 43b provided on the liquid crystal drive substrate 30 side.

<Backlight module substrate 41>
The backlight module substrate 41 may be transparent, but unlike the transparent substrate 11 of the color filter substrate and the transparent substrate 31 of the liquid crystal drive substrate, it may also be opaque. For example, the backlight module substrate 41 may be a silicon substrate on which CMOS elements (transistors, etc.) are disposed. Furthermore, the backlight module substrate 41 may be a silicon substrate on which each light-emitting element 43 is formed by LEDs crystal-grown via a buffer layer.

Furthermore, a heat dissipation film ₄₁₁ can be provided on the back surface of the backlight module substrate 41. There are no particular limitations on the material of the heat dissipation film ₄₁₁ as long as it has good heat dissipation properties. For example, the heat dissipation film ₄₁₁ can be configured as a thin film made of aluminum or copper. This thin film can be formed by vapor deposition or sputtering.

<Light-emitting element 43>
An LED (Light Emitting Diode) or an organic EL can be suitably used as the light emitting element 43. Among them, it is more preferable to use a monochromatic LED. As the monochromatic LED, a blue LED or a near-ultraviolet LED is particularly preferable.

An LED is a light-emitting device constructed by forming a pn junction between an n-type semiconductor and a p-type semiconductor. When voltage is applied across the junction, electrons and holes recombine at the interface between the n-type and p-type semiconductors, generating light as a result of this recombination.

LEDs come in two types: horizontal LEDs, in which the n-side electrode and p-side electrode are on the same side, and vertical LEDs, in which the n-side electrode and p-side electrode are on different surfaces (facing parallel surfaces) in the thickness direction of the LED. Either type can be used. It is also possible to use mini LED chips in the range of 40 to 200 μm, or micro LED chips in the range of 2 to 60 μm.

LEDs are made from compounds such as aluminum gallium arsenide (AlGaAs), gallium arsenide phosphide (GaAsP), indium gallium nitride (InGaN)/gallium nitride (GaN)/aluminum gallium nitride (AlGaN), gallium phosphide (GaP), zinc selenide (ZnSe), and aluminum indium gallium phosphide (AlGaInP), but gallium nitride (GaN) is primarily used for monochromatic blue LEDs.

The light-emitting element 43 may be mounted by flip-chip mounting using a low-melting-point alloy, mounting using an anisotropic conductive film, or wire bonding using gold wire, etc.

In this first embodiment, a light-reflective electrode 43a is disposed on a backlight module substrate 41 via a multilayer insulating layer 42. One light-reflective electrode 43a corresponds to one light-emitting element 43. Each light-emitting element 43 is connected to its corresponding light-reflective electrode 43a. Circuit wiring is formed on the multilayer insulating layer 42, and this circuit wiring is electrically connected to the light-reflective electrode 43a, allowing voltage to be applied to the light-emitting elements 43.

In addition, a transparent common electrode 43b is provided on top of the light-emitting elements 43. This common electrode 43b is electrically connected to all of the light-emitting elements 43 included in the light-emitting unit 40A, and a voltage can be applied to the light-emitting elements 43 between this common electrode 43b and the light-reflective electrode 43a to cause them to emit light.

10 shows a circuit diagram of a drive circuit for a light-emitting element of a backlight module. In the diagram, the reference numeral "43 _S " denotes a source line, and "43 _G " denotes a gate line. The reference numeral "43 _CS " denotes a storage capacitor, the reference numeral "43 _T1 " denotes a selection transistor, and the reference numeral "43 _T2 " denotes a drive transistor. Thus, this circuit requires two transistors: a selection transistor 43 _T1 and a drive transistor 43 _T2 that supplies current from the power supply line 43 _VD to the light-emitting element 43.

This circuit can also incorporate a variable resistor, and by changing the resistance of this variable resistor, an analog dimming method can be used to adjust the amount of current to the light-emitting elements 43. By adjusting the amount of current to the light-emitting elements 43 in this way, the brightness of the light source light emitted by each light-emitting element 43 can be controlled, and as a result, the brightness of the light source light can be controlled for each light-emitting unit 40A.

In addition, a PWM (Pulse Width Modulation) driving method may be selected, which adjusts the brightness of the light source light for each light-emitting unit 40A by controlling the lighting time of the light-emitting element 43.

Furthermore, a drive control circuit may be incorporated into the light-emitting unit 40A to select the light-emitting elements 43 to emit light from among the multiple light-emitting elements 43 included in the light-emitting unit 40A and apply a voltage to the light-reflective electrodes 43a of these selected light-emitting elements 43. By applying a voltage to a selected portion of the light-reflective electrodes 43a in this way, it is possible to control the brightness of each light-emitting unit 40A.

<Wavelength conversion layer 44>
The wavelength conversion layer 44 is laminated on the light-emitting element 43 via a weather-resistant resin layer 45. This wavelength conversion layer 44 converts the light source light generated by the light-emitting element 43 into pseudo-white light. In this embodiment, a blue LED with a blue emission peak is used as the light-emitting element 43 built into the backlight module 40. Since the light source light generated by this blue LED is monochromatic blue light, in order to use this light source light to display a full-color screen, this blue light source light must be converted into pseudo-white light. For this reason, the wavelength conversion layer 44 contains a material that converts the wavelength of the blue light source light to red or green.

The materials used for wavelength conversion are called quantum dots, which are nanometer-sized semiconductor particles with a quantum confinement effect (hereafter referred to as quantum dots), and inorganic phosphors (hereafter referred to as phosphors), which are typically complex oxides or nitrides containing added activators such as rare earth elements (EU, Ce, Yttrium, etc.).

The average particle size of phosphors is larger than that of quantum dots, ranging from 0.5 μm to 30 μm, but they are
Because it is manufactured under high pressure, it is highly reliable, with heat and light resistance.

Examples of quantum dots include II-VI semiconductor compounds such as MgS, MgSe, MgTe, CaS, CaSe, CaTe, SrS, SrSe, SrTe, BaS, BaSe, BaTe, ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, HgS, HgSe, and HgTe; IIIV semiconductor compounds such as AlN, AlP, AlAs, AlSb, GaAs, GaP, GaN, GaSb, InN, InAs, InP, InSb, TiN, TiP, TiAs, and TiSb; semiconductor crystals containing Group IV semiconductors such as Si, Ge, and Pb; and semiconductor compounds containing three or more elements such as InGaP. The size of quantum dots is, for example, in the range of 0.5 nm to 30 nm, and increasing the particle size shifts the converted light to longer wavelengths.

The wavelength conversion layer 44 contains red conversion particles and green conversion particles. These red conversion particles and green conversion particles that can be used in the wavelength conversion layer 44 can be appropriately selected from quantum dots or phosphors. Note that red conversion particles refer to phosphor or quantum dot particles that can receive blue light and convert the light source light generated by a blue LED into a blue wavelength. Green conversion particles are phosphor or quantum dot particles that can receive blue light and convert it into green light.

In this example, the light-emitting element 53 is a blue LED, and in order to convert the blue light source light generated by this blue LED into red and green, both red conversion particles and green conversion particles are blended into the single wavelength conversion layer 44. However, these may be treated as separate layers, with two types of layers provided: a red conversion layer that converts blue light source light into red light, and a green conversion layer that converts it into green light.

These red conversion layers and green conversion layers can be stacked. In this case, part of the blue light source light incident on these layers is converted to red light, and the other part is converted to green light. As a result, the light that exits these red conversion layers and green conversion layers becomes pseudo-white light that is a mixture of blue, red, and green light.

Furthermore, these red conversion layer and green conversion layer may be arranged apart from each other in a planar view, or may be arranged adjacent to each other.

The wavelength conversion layer 44 can be formed as a dispersion in which wavelength conversion particles are dispersed in a resin that has excellent heat and light resistance. In addition to these wavelength conversion particles and resin, transparent light-scattering particles can also be blended.

Examples of resins used in dispersions include silicone resins, epoxy resins, phenolic resins, polycarbonate resins, acrylic resins, polynorbornene resins, modified resins of these, and hybrid resins.

The light-scattering particles can be the same as those described above as transparent particles to be incorporated into the light-scattering layer 15. That is, they are particles with a particle diameter larger than the wavelength of visible light, a refractive index different from that of the resin, and are optically isotropic. Specific examples include silica particles with an average particle diameter of 1.0 to 3.0 μm, and particles of resins such as acrylic, styrene, urethane, nylon, melamine, and benzoguanamine.

The wavelength converting layer can be formed by mixing these resins, wavelength converting particles, and light scattering particles using a monomer or an organic solvent to form a liquid dispersion, and then printing the dispersion. Alternatively, the wavelength converting layer 44 can be formed by applying and curing the dispersion using a device such as a spin coater, slit coater, curtain coater, or inkjet printer.

When using phosphors as the conversion particles, it is also possible to use, for example, an alkali-soluble photosensitive polymer resist as the resin, and apply a dispersion liquid (dispersion) in which phosphors are dispersed in this polymer resist, thereby forming a patterned wavelength conversion layer 44 using photolithography techniques.

In this embodiment, as mentioned above, a monochromatic blue LED is used as the light-emitting element 43, and therefore the wavelength conversion layer 44 uses red conversion particles that convert this blue light source light into red light and green conversion particles that convert it into green light. However, as mentioned above, if a near-ultraviolet light-emitting LED is used as the light-emitting element 43, it is necessary to use three types of wavelength conversion particles that convert the near-ultraviolet light into blue light, red light, and green light, respectively, to convert the near-ultraviolet light into pseudo-white light.

<Prism sheet 46>
The prism sheet 46 widens the emission direction of the light source light emitted from the light-emitting unit 40 A. The prism sheet 46 may be provided for each light-emitting unit 40 A, or may be provided to cover a plurality of light-emitting units 40 A as shown in the figure.

This prism sheet 46 can be manufactured, for example, by embossing a transparent resin sheet. It can also be manufactured by injection molding a transparent resin. A resin with a high refractive index is preferable as the transparent resin, and acrylic resin, for example, can be used.

The liquid crystal display device 100 according to the first embodiment has been described above, but this liquid crystal display device 100 can be used in a variety of applications. Electronic devices to which the display devices according to the above-described embodiments can be applied include mobile phones, portable game devices, personal digital assistants, personal computers, e-books, video cameras, digital still cameras, head-mounted displays, navigation systems, audio playback devices (car audio, digital audio players, etc.), copiers, facsimiles, printers, multi-function printers, vending machines, automated teller machines (ATMs), personal authentication devices, optical communication devices, IC cards, and other electronic devices. Furthermore, depending on the type of electronic device to which it is applied, it may also be possible to incorporate an antenna for communication or contactless power reception and supply.

Second Embodiment
FIG. 11 is an explanatory cross-sectional view of a liquid crystal display device 200 according to the second embodiment.

The liquid crystal display device 200 according to the second embodiment has a different light-emitting unit from the liquid crystal display device 100 according to the first embodiment shown in Figure 1. Because the LED elements 243 of the second embodiment are housed in a metal container 249, the installation area of the LED elements is larger and the spacing between elements is therefore greater. However, the efficiency of use of light emitted by the inner surface of the metal container 249 is higher, making this a light source more suitable for large-screen display devices than the liquid crystal display device 100 according to the first embodiment of the present invention.

Figure 12 is an explanatory partial cross-sectional view of the backlight module 240.

The backlight module 240 is configured with an array of multiple light-reflective metal containers 249 as its light-emitting unit 240A. Each metal container 249 houses a blue LED 243 wire-bonded with gold wire 247 as a light-emitting element, and the top of each blue LED 243 is filled with a wavelength conversion layer 248 in which both red conversion particles and green conversion particles are dispersed. Therefore, blue light emitted from the blue LED 243 passes through the wavelength conversion layer 248, is converted into pseudo-white light, and is emitted. Note that the wavelength conversion layer 248 may contain light-scattering transparent particles in addition to the red conversion particles and green conversion particles.

A prism sheet 246 is disposed on top of the multiple metal containers 249 that make up the light-emitting unit 240A so as to cover all of these multiple metal containers 249.

Like the liquid crystal display device 100, it is clear that the liquid crystal display device 200 according to the second embodiment can also be applied to a variety of electronic devices.

[Third embodiment]
The liquid crystal display device according to the third embodiment differs from the liquid crystal display device 100 according to the first embodiment only in the positional relationship between the light-reflecting matrix and the light-scattering layer and the structure of the light-reflecting matrix, and is otherwise similar to the liquid crystal display device 100 according to the first embodiment. Therefore, the differences from the liquid crystal display device 100 will be described with reference to Fig. 13. Fig. 13 relates to the third embodiment of the present invention and is an explanatory cross-sectional view of a color filter substrate thereof.

First, in the liquid crystal display device 100 according to the first embodiment, the light-reflective matrix 17 is provided on the planarization layer 14, and the light-scattering layer 15 is disposed in the openings of the light-reflective matrix 17. On the other hand, in the liquid crystal display device according to the third embodiment, a light-scattering layer 315 is laminated on the planarization layer 314, and the light-reflective matrix 317 is provided on the light-scattering layer 315. Moreover, a second black matrix ₃₁₇₃ is first provided on the light-scattering layer 315, and on this second black matrix ₃₁₇₃ as a base, a light-reflective matrix ₃₁₇ composed of a base material ₃₁₇₁ and a light-reflective thin film ₃₁₇₂ on its surface is provided on top of this second black matrix 3173. In this liquid crystal display device, since the second black matrix ₃₁₇₃ is disposed on the screen observer's side of the light-reflective matrix 17, the light-reflective matrix 17 is prevented from being seen by the screen observer, thereby improving the visibility of the display device.

Spacers 318 are erected on the light-reflective matrix 317. Transparent resin layers 316 are provided in the openings of the light-reflective matrix 317, and the surfaces of the light-reflective matrix 317 and the transparent resin layer 316 are flush with each other. As a result, the thickness of the liquid crystal is kept uniform across the entire surface of the liquid crystal display device by the spacers 318.

Like the liquid crystal display devices 100 and 200, it is clear that the liquid crystal display device according to the third embodiment can also be applied to a variety of electronic devices.

100: Liquid crystal display device according to the first embodiment Area: Display area Ax: Length of the display area in the X direction Ay: Length of the display area in the Y direction 10: Color filter substrate 11: Transparent substrate 12: Black matrix 13: Color filter layer 13 ₁₁ , 13 ₁₂ , . . . : Colored filters (pixel openings)
14: Planarization layer 15: Light scattering layer 16: Transparent resin layer 17: Light-reflective matrix 17 ₁ : Base material of light-reflective matrix 17 ₂ : Light-reflective thin film 18: Spacer 19: Polarizing film 20: Liquid crystal layer 30: Liquid crystal drive substrate 31: Transparent substrate 33: Common electrode 34: Insulating layer 35: Pixel electrode 36: Polarizing film 40: Backlight module 40A: Light-emitting unit 40Ax: Length of light-emitting unit in X direction 40Ay: Length of light-emitting unit in Y direction 41: Backlight module substrate 41 ₁ : Heat-dissipating film 42: Insulating layer 43: Light-emitting element 43a: Light-reflective electrode 43b: Common electrode 44: Wavelength conversion layer 45: Weather-resistant resin layer 46: Prism sheets L1 to L8: Diffused light 200: Liquid crystal display device according to the second embodiment 210: Color filter substrate 211: Transparent substrate 212: Black matrix 213: Color filter layer
217: Light-reflective matrix 220: Liquid crystal layer 230: Liquid crystal drive substrate 231: Transparent substrate 233: Common electrode 235: Pixel electrode 240: Backlight module 240A: Light-emitting unit 241: Backlight module substrate 243: Blue LED 46: Prism sheet 247: Gold wire 248: Wavelength conversion layer 249: Metal container 310: Color filter substrate according to the third embodiment 311: Transparent substrate 312: Black matrix 313: Color filter layer 313 ₁₁ , 313 ₁₂ , . . . : Colored filters (pixel openings)
314: Planarizing layer 315: Light scattering layer 316: Transparent resin layer 317: Light reflective matrix 317 ₁ : Base material of light reflective matrix 317 ₂ : Light reflective thin film 317 ₃ : Second black matrix 318: Spacer

Claims (14)

A liquid crystal display device comprising a color filter substrate, a liquid crystal drive substrate, a backlight module, and a liquid crystal layer, wherein a display screen is divided into a plurality of display areas, and the backlight module is driven for each display area to control the intensity of light emitted from the backlight module, and a liquid crystal layer is disposed between the color filter substrate and the liquid crystal drive substrate, and the liquid crystal layer is driven for each pixel to control the transmission of light from the backlight module to display a screen,
the color filter substrate comprises a black matrix , a light-reflecting matrix , and a light-scattering layer ;
the black matrix has openings corresponding to the pixels, and colored filters are disposed in the openings;
the light-reflective matrix is located at the boundary between the display areas ;
the light-scattering layer is made of a dispersion in which transparent particles are dispersed in a transparent resin, and is provided in the opening surrounded by the light-reflecting matrix;
The liquid crystal display device is characterized in that the light-reflecting matrix is provided so as to protrude beyond the light-scattering layer in a thickness direction of the light-scattering layer . The liquid crystal display device of claim 1, characterized in that a plurality of the pixels are included within the display area. A liquid crystal display device according to claim 1 or 2, characterized in that the light-reflective matrix has a light-reflective thin film on its surface. The liquid crystal display device described in claim 3, characterized in that the light-reflective thin film is covered with a transparent resin protective layer. A liquid crystal display device according to claim 3 or 4, characterized in that the light-reflective thin film is made of a metal thin film of aluminum or an aluminum alloy. The liquid crystal display device according to claim 3 or 4, characterized in that the light-reflective thin film has a three-layer structure, the middle layer of which is made of a metal thin film of silver or a silver alloy. A liquid crystal display device as described in any one of claims 1 to 6, characterized in that the backlight module is composed of an array of multiple light-emitting units, each of which corresponds to a respective one of the display areas. The liquid crystal display device described in claim 7, characterized in that multiple light-emitting elements are arranged inside the light-emitting unit. The liquid crystal display device according to claim 8, characterized in that the light-emitting element is a light-emitting element that emits monochromatic light in blue or near-ultraviolet. The liquid crystal display device according to claim 8 or 9, characterized in that the light-emitting element is an LED. The liquid crystal display device described in claim 10, characterized in that a wavelength conversion layer that converts light from the light-emitting element into green light or red light is provided between the light-emitting element and the colored filter. 12. The liquid crystal display device according to claim 1, wherein the light scattering layer contains an ultraviolet absorber. The liquid crystal display device according to any one of claims 1 to 12, characterized in that a spacer is laminated on the light-reflecting matrix, and the spacer controls the gap between the color filter substrate and the liquid crystal driving substrate. A color filter substrate for a liquid crystal display device,
The display device is configured to include a black matrix , a light-reflecting matrix , and a light-scattering layer ,
the black matrix has openings corresponding to pixels of a display screen, and colored filters are disposed in the openings;
the light-reflective matrix is located at a boundary between display areas each including a plurality of the pixels ;
the light-scattering layer is made of a dispersion in which transparent particles are dispersed in a transparent resin, and is provided in the opening surrounded by the light-reflecting matrix;
The color filter substrate , wherein the light-reflecting matrix is provided so as to protrude beyond the light-scattering layer in a thickness direction of the light-scattering layer .