Liquid crystal display device and color filter substrate

Abstract

To provide a liquid crystal display that uses a local dimming technique, and has improved efficiency of use of light source light from light emitting devices of a back light.SOLUTION: A color filter substrate 10, a liquid crystal drive substrate 30, a backlight module 40, and a liquid crystal layer 20 form a liquid crystal display 100. A display screen is divided into a plurality of display areas, and the backlight module 40 is driven for each of the display areas to control intensity of light generated therefrom. The color filter substrate 10 includes black matrices 12 and light reflecting matrices 17. The black matrix has an opening corresponding to a pixel, and a coloring filter is arranged in the opening. Meanwhile, the light reflecting matrix 17 is located at a boundary of the display areas.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a liquid crystal display device in which the display screen is divided into a plurality of areas and the light intensity of the backlight is controlled for each area to display an image. [Background technology]

[0002] A method of dividing the display screen of a liquid crystal display device into multiple areas and controlling the light intensity of the backlight for each area to display the screen is known as local dimming technology, and is described in, for example, Patent Documents 1 to 3.

[0003] By controlling the light intensity for each area in this way, it is possible to effectively utilize the light emitted from the light-emitting element, improving the light utilization efficiency. For the same reason, it is also possible to prevent heat generation in the light-emitting element and deterioration of peripheral components in the vicinity of the light-emitting element.

[0004] However, even with this local dimming technology, the light utilization efficiency is still insufficient, and there is still room for improvement. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2017 / 191714 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-64391 [Patent Document 3] International Publication No. 2019 / 244351 Summary of the Invention [Problem to be solved by the invention]

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a liquid crystal display device that further improves the efficiency of use of light from the light source emitted from the light emitting elements of the backlight. [Means for solving the problem]

[0007] 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 a 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.

[0008] The liquid crystal display device according to the present invention may be a liquid crystal display device in which a plurality of the pixels are included within the display area.

[0009] 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 the surface.

[0010] In addition, in the liquid crystal display device according to the present invention, a transparent resin protective layer is coated on the light-reflecting thin film. The liquid crystal display device may be a liquid crystal display device having the same structure.

[0011] Furthermore, the liquid crystal display device according to the present invention may be a liquid crystal display device in which the light-reflecting thin film is made of a metal thin film of aluminum or an aluminum alloy.

[0012] Furthermore, the liquid crystal display device according to the present invention may 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.

[0013] 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 a plurality of light-emitting units, each of which corresponds to a respective one of the display areas.

[0014] The liquid crystal display device according to the present invention may be a liquid crystal display device in which a plurality of light emitting elements are arranged inside the light emitting unit.

[0015] Furthermore, the liquid crystal display device according to the present invention may be a liquid crystal display device in which the light emitting element is a light emitting element that emits blue or near ultraviolet monochromatic light.

[0016] 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.

[0017] The liquid crystal display device according to the present invention may also be a liquid crystal display device having a wavelength conversion layer between the light emitting element and the colored filter, which converts light emitted by the light emitting element into green light or red light.

[0018] Furthermore, the liquid crystal display device according to the present invention may 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.

[0019] 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.

[0020] Furthermore, the liquid crystal display device according to the present invention may be a liquid crystal display device in which 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.

[0021] 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. [Effects of the Invention]

[0022] According to the present invention, in a liquid crystal display device using local dimming technology, it is possible to further improve the light utilization efficiency of light from the light-emitting elements of the backlight. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is an explanatory cross-sectional view of a liquid crystal display device according to a first embodiment of the present invention. [Figure 2] FIG. 2 is an explanatory cross-sectional view of a color filter substrate according to the first embodiment of the present invention. [Figure 3] FIG. 3 is a partial plan view illustrating the arrangement of pixels and display areas of a color filter substrate according to the first embodiment of the present invention. [Figure 4] FIG. 4 is an explanatory cross-sectional view for explaining the behavior of emitted light in the absence of a light-reflecting matrix. [Figure 5] FIG. 5 is an explanatory cross-sectional view for explaining the behavior of emitted light when a light absorbing matrix is ​​provided instead of a light reflecting matrix. [Figure 6] 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. [Figure 7] FIG. 7 is an explanatory cross-sectional view of a liquid crystal driving substrate according to the first embodiment of the present invention. [Figure 8] FIG. 8 is a circuit diagram of a drive circuit for a thin film transistor of a liquid crystal drive substrate according to the first embodiment of the present invention. [Figure 9]FIG. 9 is a partial cross-sectional view for explaining a backlight module according to the first embodiment of the present invention. [Figure 10] 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. [Figure 11] FIG. 11 is an explanatory cross-sectional view of a liquid crystal display device according to a second embodiment of the present invention. [Figure 12] FIG. 12 is a partial cross-sectional view illustrating a backlight module according to a second embodiment of the present invention. [Figure 13] FIG. 13 is an explanatory cross-sectional view of a color filter substrate according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0024] [First embodiment] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, in which: Fig. 1 is an explanatory cross-sectional view of a liquid crystal display device according to a first embodiment of the present invention;

[0025] 1, the liquid crystal display device 100 of the first embodiment includes, as its components, a color filter substrate 10, a liquid crystal driving 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 driving substrate 30.

[0026] 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, the backlight module 40 is configured by arranging a plurality of light-emitting units 40A, and each light-emitting unit 40A has a plurality of built-in light-emitting elements made up of blue-emitting LEDs.

[0027] 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. The liquid crystal drive substrate 30 and the color filter substrate 10 are provided with polarizing films, 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 a voltage is applied, and the light transmitted through the polarizing film of the color filter substrate 10 can be used as display light, which can be used to display images on a screen.

[0028] Next, this liquid crystal display device is configured to be able to control the light intensity for each display area by utilizing the aforementioned local dimming technology, and for this purpose, the color filter substrate 10 has a light-reflective matrix located at the boundary between the display areas in addition to a black matrix located at the boundary between the pixels.

[0029] First, the black matrix is ​​located at the boundary between pixels on the display screen. The pixel electrodes 35 are provided corresponding to the pixel openings, and the liquid crystal layer 20 is controlled for each pixel by, for example, a thin film transistor provided for each pixel opening. Therefore, the openings (pixel openings) provided 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 constitute the pixels of the display screen.

[0030] On the other hand, the light-reflecting matrix is ​​disposed at the boundary between the display areas, and therefore the light-reflecting matrix surrounds each of the display areas.

[0031] On the other hand, the backlight module is configured by arranging a plurality of light-emitting units, each of which corresponds to a respective display area, and 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.

[0032] Therefore, the light source light emitted from the light-emitting units is incident on the corresponding display area, but since this display area is surrounded by a light-reflecting matrix, the light source light traveling in an oblique direction is reflected by the light-reflecting matrix. This improves the light utilization efficiency of the light source light emitted from the light-emitting units and also improves the contrast of the display screen. Furthermore, since this light-reflecting matrix is ​​difficult for an observer to notice, it is possible to maintain high quality of the display screen.

[0033] Next, the color filter substrate 10, the liquid crystal drive substrate 30, and the backlight module 40 will be described in detail separately.

[0034] (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.

[0035] 2, the color filter substrate 10 is configured to include 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.

[0036] 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 this black matrix 12. Therefore, when viewed from the display screen side, the color filter layer 13 is not observed in the areas overlapping the black matrix 12, but can only be observed through the openings of 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, thereby improving the contrast of the display screen.

[0037] 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 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 this color filter layer 13. Alternatively, the black matrix 12 may be formed into two layers, with the color filter layer 13 sandwiched between these two black matrix layers 12.

[0038] Next, a light-reflective matrix 17 is laminated on the color filter layer 13 with a transparent planarizing layer 14 interposed therebetween. 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 the light-scattering layer 15, but this transparent resin layer 16 is not an essential component. Spacers 18 are provided upright on 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 crystals 20 are disposed in this gap, and the spacers 18 serve to maintain a constant and uniform thickness of the liquid crystals 20.

[0039] Furthermore, a polarizing film 19 is laminated on the side of the transparent substrate 11 opposite to the liquid crystal 20 side, that is, on the screen observer side.

[0040] <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 transparent substrate 11 for visible light, the more preferable. 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.

[0041] <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 on the display screen, with its openings corresponding to the pixels on 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."

[0042] The black matrix 12 can be formed by dispersing black pigments, such as carbon black or titanium black, that have a visible light absorbing function in a resin. In addition to these black pigments, organic pigments, such as blue pigments, may also be added.

[0043] <Color filter layer 13> The color filter layer 13 is made up of color filters 13 having different colors. 11 ,13 12 ,‥. Color filter 13 11 ,13 12 , ... color the transmitted display light and determine the color of the display screen. For this reason, color filters of the three primary colors of light (red, green, and blue) are usually used. 11 ,13 12 , ... are arranged in the pixel opening.

[0044] In this embodiment, each colored filter has a linear shape extending in the direction perpendicular to the drawing (Y direction). 11 ,13 12 , . . . intersect with the black matrix 12 and overlap with the black matrix 12 at the intersection positions, but 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 labeled "13 11 "," "13 12 "‥of Therefore, these symbols indicate the pixel openings and the pixels, and also indicate the colored filters arranged in the pixel openings.

[0045] These colored filters 13 11 ,13 12 The layers 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 39, 38, 39, 4

[0046] Examples of red organic pigments that can be used in red colored filters (red filters) include CI 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. In addition to the red pigment, a yellow pigment or an orange pigment can also be used in the red filter.

[0047] Examples of yellow pigments include CI 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, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 17 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, 214, etc.

[0048] Examples of green organic pigments that can be used in green colored filters (blue filters) include green pigments such as CI 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.

[0049] The green colored filter (green filter) can also contain the above-mentioned yellow pigment in addition to the green pigment.

[0050] Examples of blue organic pigments that can be used for blue filters include blue pigments such as CI Pigment Blue 15, 15:1, 15:2, 15:3, 15:4, 15:6, 16, 22, 60, and 64.

[0051] The blue filter may contain a violet pigment in addition to the blue pigment, such as CI Pigment Violet 1, 19, 23, 27, 29, 30, 32, 37, 40, 42, and 50.

[0052] The transparent photosensitive resin in which these organic pigments are dispersed is preferably a transparent resin having a transmittance of 90% or more in the visible range, and more preferably an alkali-soluble photosensitive resin containing a resin precursor.

[0053] Examples of this transparent photosensitive resin include resins obtained by reacting a linear polymer having a reactive substituent such as a hydroxyl group, a carboxyl group, or an amino group with a (meth)acrylic compound or cinnamic acid having a reactive substituent such as an isocyanate group, an aldehyde group, or an epoxy group, to introduce a photocrosslinkable group such as a (meth)acryloyl group or a styryl group into the linear polymer.

[0054] In addition, the monomers and oligomers that are precursors of transparent resins include 2-hydroxyethylene Examples of suitable acrylic acid esters and methacrylic acid esters include methyl (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.

[0055] These pigments are mixed with a transparent photosensitive resin or its precursor in a range of 15% by mass to 60% by mass to prepare a coating liquid, which is then applied to the black matrix 12 to form a coating film, which is then exposed to light through a photomask and developed with an alkaline solution to form a colored filter 13. 11 ,13 12 ,‥ can be formed.

[0056] <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 collection 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.

[0057] 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, or the positional relationship between the display areas and the pixels, will be described with reference to Fig. 3. Fig. 3 is an explanatory partial plan view of the color filter substrate for explaining the arrangement of the pixels and display areas in the first embodiment.

[0058] 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.

[0059] The display area Area includes a plurality of pixel openings, which are arranged in a matrix. Of the pixel openings included in Area, the pixel openings belonging to the first row are each designated by the reference numeral 13. 11 ,13 12 ,‥,13 1n That is, n pixel openings are arranged in the X direction. Of the pixel openings included in Area 1, the pixel openings belonging to the first column are denoted by the reference numeral 13. 21 ,13 31 ,‥,13 m1In other words, m pixel openings are lined up in the Y direction. Therefore, this Area includes m×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 64×3=192 pixel openings, and if 64 pixel openings are arranged in the Y direction, this Area includes 64×192=12,288 pixel openings.

[0060] 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. 2,000 light-emitting units are required.

[0061] Furthermore, if 49,152 pixel openings are assigned to one display area, the number of display areas is approximately 500. In this case, approximately 500 light-emitting units are assigned to each display area, and the light emission intensity of the light-emitting units is controlled, thereby enabling the intensity of the light source light to be controlled for each display area.

[0062] The light-reflective matrix 17 can be configured by providing a light-reflective thin film 172 so as to cover the surface of a base material 171. Furthermore, a transparent resin protective layer may be provided on the light-reflective thin film 172.

[0063] The base material 171 can be made of resin and may be transparent or opaque. In this embodiment, the base is wide at its base, as shown in FIG.

[0064] The light-reflective thin film 172 can be made of a thin film with a single layer structure or a multi-layer structure, and the thickness thereof may be, for example, 0.15 to 0.8 μm.

[0065] 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 aluminum alloys containing high-melting-point metals such as molybdenum and titanium, rare earth elements such as neodymium, or small amounts of silicon. From the perspective of reflectivity, aluminum alloys containing 0.2 to 3 mass% neodymium are preferred. If the neodymium content is less than 0.2 mass%, the aluminum crystals tend to become coarse or hillocks form, which can reduce the 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 achieved when the neodymium content is in the range of 0.2 mass% to 3 mass%.

[0066] 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 metal thin film of silver or a silver alloy serves as an intermediate layer and thin films of conductive oxide 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 with silver. Examples of metal elements that do not substantially have a solid solubility with silver include titanium, zirconium, tantalum, niobium, hafnium, cerium, bismuth, germanium, silicon, and chromium.

[0067] Furthermore, these light-reflective thin films 172 can also be laminated between the substrate 171 and the thin film made of titanium nitride or titanium.

[0068] 4 to 6 illustrate the effects of the presence or absence of this light-reflective thin film 172 and the differences in its structure.

[0069] FIG. 4 is an explanatory cross-sectional view of the case where there is no light-reflecting matrix, and shows a virtual matrix 17o placed at the position where a light-reflecting matrix 17, which will be described later, is to be placed.

[0070] As shown in Figure 4, if there is no light-reflecting matrix, the diagonally diffused light L1 and L2 pass through the virtual matrix 17o in the direction of the arrow. The diffused light L1 invades the adjacent display area Area 2 from the rear Area 1. On the other hand, the diffused light L1 invades the adjacent display area Area 2 from the display area Area 1. In this way, light invades the adjacent display area from the display area where it should originally travel, and this invading light becomes stray light, reducing the contrast of the displayed image.

[0071] FIG. 5 is a cross-sectional view for explaining a case where a light absorbing matrix 17a is provided in place of the light reflecting matrix 17. In FIG.

[0072] The diffused light L3 and L4 that diffuses obliquely inside the light-scattering layer 15 is absorbed by the light-absorbing matrix 17a. Therefore, the light does not invade adjacent display areas, and the contrast does not decrease due to the invaded stray light. However, in this case, even though the light utilization efficiency is improved using local dimming technology, the light source light generated from the backlight is absorbed by the light-absorbing matrix 17a, resulting in a decrease in the spectral utilization efficiency. Furthermore, since light transmission and reflection are suppressed near the light-absorbing matrix 17a, the light-absorbing matrix 17a can be easily seen or recognized by a screen observer. This means that the matrix pattern is always displayed on the display screen.

[0073] Next, as shown in FIG. 6, when a light-reflecting matrix 17 is provided, the diagonal diffused light beams L5 and L7 are each reflected by the light-reflecting matrix 17. That is, the diffused light beam L5 traveling from the display area Area1 toward the adjacent display area Area2 is reflected by the light-reflecting matrix 17, and the reflected light beam L6 returns to the display area Area1. The diffused light beam L7 traveling from the display area Area2 toward the adjacent display area Area1 is reflected by the light-reflecting matrix 17, and the reflected light beam L8 returns to the display area Area2. The diffused light beams L5 and L7 do not invade the adjacent display areas and do not become stray light, reducing the contrast of the displayed image. Furthermore, because the light-reflecting matrix 17 does not absorb light, it does not reduce the light utilization efficiency of the light source light generated by the backlight. 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-reflecting matrix is ​​provided. Therefore, it is difficult for the screen observer to recognize the light reflecting matrix 17, and the display quality of the screen can be maintained at a high level.

[0074] <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.

[0075] For this purpose, spacers 18 are provided on top of the light-reflective matrix 17, the height of which is equal to the thickness of the liquid crystal layer 20.

[0076] As shown in the figure, the spacers 18 do not need to be provided over the entire surface of the light-reflecting matrix 17. It is sufficient to provide them on a part of the surface.

[0077] 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.

[0078] <Light scattering layer 15> As shown in Figure 2, the light-scattering layer 15 is placed 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 and preventing a decrease in the contrast of the screen display due to the specular reflection light.

[0079] The light-scattering layer 15 can be formed by blending transparent particles with a resin to form a coating liquid, and then applying the coating liquid. A dispersing agent or an ultraviolet absorber may also be blended. As will be described later, the light-scattering layer 15 can also be formed using two resins that have low compatibility and different refractive indices.

[0080] Therefore, when forming the 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 this light-scattering layer 15. Particles with a particle diameter similar to the wavelength of the visible light to be scattered have high transmittance to the visible light to be scattered, 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 properties are exhibited.

[0081] For these reasons, the transparent particles preferably have an average particle size of 1.0 to 3.0 μm, and the dispersion aid may also contain transparent fine particles with an average particle size of about 0.2 μm or 0.1 μm or less.

[0082] Furthermore, it is 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 reflected or refracted at the interface between the transparent particles and the resin, which have different refractive indices, causing light scattering.

[0083] Furthermore, it is desirable that the transparent particles are optically isotropic in order to maintain, without rotating, the polarization plane of the display light passing through the light-scattering layer 15. An example of such optically isotropic inorganic particles is amorphous silica particles.

[0084] In addition, organic particles are generally isotropic, and there are known organic particles with various properties, including refractive index. For example, there are particles made of resins such as acrylic, styrene, urethane, nylon, melamine, and benzoguanamine. Of course, these particles can be used in combination.

[0085] Examples of the ultraviolet absorber include benzophenone-based compounds, benzotriazole-based compounds, and triazine-based compounds. The ultraviolet absorber preferably has a phenolic hydroxyl group. By providing the phenolic hydroxyl group, crosslinking with compounds having an alkoxymethyl group or a methylol group can be performed during heat treatment. Crosslinking can suppress bleeding of the ultraviolet absorber during long-term storage after hardening, thereby improving reliability. The amount of ultraviolet absorber added can be, for example, in the range of 0.05 to 10% by mass relative to the resin.

[0086] Because the light-scattering layer 15 is thus composed of a dispersion of transparent particles larger than the wavelength of light, its thickness is preferably greater than the average particle size of the transparent particles. For example, it is 1 to 50 μm. It can be formed thicker than 50 μm, but increasing the thickness beyond 50 μm does not improve scattering properties much. In fact, forming a thick layer increases the process load, such as wasted time during coating and drying.

[0087] As described above, it is also possible to form a coating liquid by dissolving or dispersing a plurality of resins that have low compatibility and different refractive indices in a solvent, and after applying this coating liquid, to cause phase separation of these resins, thereby forming a layer with a sea-island structure having different refractive indices, and to use this layer as the light-scattering layer 15.

[0088] In this embodiment, the transparent resin layer 16 is laminated on the light scattering layer 15, but this transparent resin layer 16 is not necessarily required. When they are laminated, it is desirable that the surface of transparent resin layer 16 is flush with the surface of light-reflective matrix 17. When transparent resin layer 16 is not laminated on light-scattering layer 15, it is of course desirable that the surface of light-scattering layer 15 is flush with the surface of light-reflective matrix 17. When the surface of light-reflective matrix 17 and the surrounding surfaces are flush with each other in this way, it is possible to make the thickness of liquid crystal layer 20 uniform.

[0089] (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 wiring substrate base material.

[0090] 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, thereby displaying an image on the screen.

[0091] In this embodiment, the liquid crystal layer 20 is driven by the FFS (fringe field switching) method, which drives the liquid crystal layer 20 using a fringe electric field between the pixel electrode 35 and the common electrode 33. However, if a VA (vertical alignment) type liquid crystal, which drives the liquid crystal layer 20 using an electric field between the color filter substrate 10 and the liquid crystal drive substrate 30, is used, 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.

[0092] 8 shows a circuit diagram of a circuit for applying a voltage to the pixel electrode 35. As shown in this diagram, one pixel electrode 35 is connected to one thin film transistor 35.T and one thin film transistor 35 T By controlling the voltage, it is possible to control one pixel electrode 35. In other words, it is possible to control each pixel electrode 35 individually.

[0093] In this circuit, the source line 35 S The video signal from the gate line 35 G Upon receiving a selection signal from the pixel electrode 35, a liquid crystal driving voltage is applied to the pixel electrode 35, and the liquid crystal layer 20 is driven. CS " indicates the auxiliary capacitance, and the symbol "35 C " indicates the storage capacitance line, and these storage capacitance 35 CS and auxiliary capacitance line 35 S The formation of may be omitted.

[0094] (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, and 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.

[0095] 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 light-emitting elements 43 arranged in one 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.

[0096] 1 and 9, the backlight module 40 is configured by arranging light-emitting units 40A on the surface of a substrate (backlight module substrate) 41 facing the liquid crystal drive substrate 30, and further laminating a wavelength conversion layer 44 for conversion and a prism sheet 46. In addition to the light-emitting elements 43, the light-emitting units 40A are configured to include 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.

[0097] <Backlight module board 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.

[0098] 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.

[0099] <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.

[0100] An LED is a light-emitting device that is constructed by forming a pn junction between an n-type semiconductor and a p-type semiconductor. When voltage is applied to both sides of the junction, electrons and holes recombine at the interface between the n-type and p-type semiconductors, and light is generated as a result of this recombination.

[0101] There are two types of LEDs: 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 of these can be used. Also, mini LED chips with a size of 40 to 200 μm or micro LED chips with a size of 2 to 60 μm can be used.

[0102] 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 mainly used for monochromatic blue LEDs.

[0103] 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 or the like.

[0104] In the first embodiment, light-reflective electrodes 43a are arranged 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 is electrically connected to the light-reflective electrode 43a, allowing a voltage to be applied to the light-emitting element 43.

[0105] In addition, a transparent common electrode 43b is provided on top of the light-emitting element 43, and 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.

[0106] FIG. 10 shows a circuit diagram of a driving circuit for the light emitting element of the backlight module. S " is the source line, "43 G " indicates a gate line. CS " indicates the auxiliary capacitance, and the symbol "43 T1 " indicates a selection transistor, and "43 T2 " indicates a drive transistor. In this circuit, the select transistor 43 T1 and power line 43 VD A driving transistor 43 supplies a current to the light emitting element 43 from T2 Two transistors are required.

[0107] This circuit can employ an analog dimming method in which a variable resistor is further incorporated and the resistance value of the variable resistor is changed to adjust the magnitude of the current to the light-emitting elements 43. By adjusting the magnitude of the current to the light-emitting elements 43 in this way, the brightness of the light source light generated 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.

[0108] Alternatively, 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 elements 43.

[0109] Furthermore, a drive control circuit may be incorporated into the light-emitting unit 40A to select light-emitting elements 43 to be emitted from the plurality of light-emitting elements 43 included in the light-emitting unit 40A and apply a voltage to the light-reflective electrodes 43a of the selected light-emitting elements 43. By applying a voltage to some of the light-reflective electrodes 43a selected in this manner, it is possible to control the brightness of each light-emitting unit 40A.

[0110] <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.

[0111] The materials used for wavelength conversion are called quantum dots, which are nanometer-sized semiconductor particles with quantum confinement effect (hereinafter referred to as quantum dots), and inorganic phosphors (hereinafter referred to as phosphors), which are represented by complex oxides and nitrides to which activators such as rare earth elements EU (europium), Ce (cerium), and Y (yttrium) have been added.

[0112] The average particle size of phosphors is larger than that of quantum dots, ranging from 0.5 μm to 30 μm. Because it is manufactured under high pressure, it has high reliability, including heat and light resistance.

[0113] 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, and semiconductor crystals containing Group IV semiconductors such as Si, Ge, and Pb, as well as semiconductor compounds containing three or more elements such as InGaP. The size of quantum dots is, for example, within the range of 0.5 nm to 30 nm, and increasing the particle size shifts the converted light to longer wavelengths.

[0114] The wavelength conversion layer 44 contains red conversion particles and green conversion particles. These red conversion particles and green conversion particles applicable to the wavelength conversion layer 44 can be appropriately selected from quantum dots or phosphors. Note that the red conversion particles refer to phosphor or quantum dot particles that can receive blue light and convert the light source light generated from a blue LED into a blue wavelength. The green conversion particles are phosphor or quantum dot particles that can receive blue light and convert it into green light.

[0115] 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 a single wavelength conversion layer 44, but these may also be treated as separate layers, with two types of layers provided: a red conversion layer that converts the blue light source light into red light, and a green conversion layer that converts it into green light.

[0116] These red conversion layer and green conversion layer can be arranged in a stack. In this case, part of the blue light source light incident on these layers is converted into red light, and the other part is converted into green light. As a result, the light exiting these red conversion layer and green conversion layer becomes pseudo-white light that is a mixture of blue light, red light, and green light.

[0117] Furthermore, the red color conversion layer and the green color conversion layer may be disposed apart from each other in a plan view, or may be disposed adjacent to each other.

[0118] The wavelength converting layer 44 can be formed as a dispersion in which wavelength converting particles are dispersed in a resin having excellent heat and light resistance. In addition to the wavelength converting particles and resin, transparent light scattering particles can also be blended.

[0119] Examples of resins used in the dispersion include silicone resins, epoxy resins, phenolic resins, polycarbonate resins, acrylic resins, polynorbornene resins, modified resins thereof, and hybrid resins.

[0120] The light-scattering particles may be any of those described above as transparent particles to be blended 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 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.

[0121] The wavelength converting layer 44 can be formed by mixing the resin, wavelength converting particles, and light scattering particles in 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 the dispersion using a device such as a spin coater, a slit coater, a curtain coater, or an inkjet printer, and then curing the applied dispersion.

[0122] In addition, when using a phosphor as the conversion particles, it is also possible to use, for example, an alkali-soluble photosensitive polymer resist as the resin, apply a dispersion liquid (dispersion) in which the phosphor is dispersed in this polymer resist, and form a patterned wavelength conversion layer 44 using a photolithography technique.

[0123] In this embodiment, as described 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 described above, if a near-ultraviolet light-emitting LED is used as the light-emitting element 43, it is necessary to convert the near-ultraviolet light into pseudo-white light using three types of wavelength conversion particles that convert the near-ultraviolet light into blue light, red light, and green light, respectively.

[0124] <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.

[0125] The prism sheet 46 can be manufactured, for example, by embossing a transparent resin sheet. Alternatively, it can be manufactured by injection molding a transparent resin. A resin with a high refractive index is preferable as the transparent resin, and an acrylic resin, for example, can be used.

[0126] The liquid crystal display device 100 according to the first embodiment has been described above, but this liquid crystal display device 100 can be applied in a variety of ways. Examples of electronic devices to which the display devices according to the above-described embodiments can be applied include electronic devices such as 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, and IC cards. Depending on the type of electronic device to which the display device is applied, it may also be possible to further incorporate an antenna for communication or contactless power reception and supply.

[0127] [Second embodiment] FIG. 11 is an explanatory cross-sectional view of a liquid crystal display device 200 according to the second embodiment.

[0128] The liquid crystal display device 200 according to the second embodiment has a light-emitting unit different from that of the liquid crystal display device 100 according to the first embodiment shown in Fig. 1. Since the LED elements 243 of the second embodiment are housed in a metal container 249, the installation area of ​​the LED elements is widened and the spacing between the elements is increased, but the efficiency of use of light emitted by the inner surface of the metal container 249 is increased, making the liquid crystal display device 200 a light source more suitable for a display device with a large screen than the liquid crystal display device 100 according to the first embodiment of the present invention.

[0129] FIG. 12 is a partial cross-sectional view for explaining the backlight module 240. As shown in FIG.

[0130] The backlight module 240 has a light-emitting unit 240A configured by arranging multiple light-reflective metal containers 249. Each metal container 249 houses a blue LED 243 as a light-emitting element, which is wire-bonded with gold wire 247. A wavelength conversion layer 248 containing dispersed red and green conversion particles is filled above the blue LED 243. 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 and green conversion particles.

[0131] A prism sheet 246 is disposed on the plurality of metal containers 249 constituting the light-emitting unit 240A so as to cover all of the plurality of metal containers 249.

[0132] It is apparent that, like the liquid crystal display device 100, the liquid crystal display device 200 according to the second embodiment can also be applied to various electronic devices.

[0133] [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-reflective matrix and the light-scattering layer and the structure of the light-reflective 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.

[0134] 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, the 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. Furthermore, a second black matrix 3173 is first provided on the light-scattering layer 315, and on this second black matrix 3173 as a base, the light-reflective matrix 317, which is composed of a base material 3171 and a light-reflective thin film 3172 on its surface, is provided on top of the second black matrix 3173, using the second black matrix 3173 as a base. In this liquid crystal display device, the second black matrix 3173 is disposed on the screen observer's side of the light-reflective matrix 17, which prevents the light-reflective matrix 17 from being seen by the screen observer, thereby improving the visibility of the display device.

[0135] Spacers 318 are provided upright on light-reflecting matrix 317. Transparent resin layer 316 is provided in the openings of light-reflecting matrix 317, and the surfaces of light-reflecting matrix 317 and transparent resin layer 316 are flush with each other, so that spacers 318 keep the thickness of the liquid crystal uniform over the entire surface of the liquid crystal display device.

[0136] As with 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 various electronic devices. [Explanation of symbols]

[0137] 100: Liquid crystal display device according to the first embodiment Area: Display area Ax: X-direction length of display area Ay: Y-direction length of display area 10: Color filter substrate 11: Transparent substrate 12: Black matrix 13: Color filter layer 13 11 ,13 12 , ‥: Colored filter (pixel opening) 14: Flattening layer 15:Light scattering layer 16: Transparent resin layer 17: Light-reflecting matrix 171: Base material of light-reflecting matrix 172: Light-reflecting thin film 18: Spacer 19: Polarizing film 20: Liquid crystal layer 30: LCD drive board 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 the light-emitting unit in the X direction 40Ay: Length of the light-emitting unit in the Y direction 41: Backlight module substrate 411: Heat dissipation 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 sheet 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-reflecting matrix 220: Liquid crystal layer 230: LCD drive board 231: Transparent substrate 233: Common electrode 235: Pixel electrode 240: Backlight module 240A: Lighting 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 filter (pixel opening) 314: Flattening layer 315: Light scattering layer 316: Transparent resin layer 317: Light-reflecting matrix 3171: Light-reflective matrix substrate 3172: Light-reflective thin film 3173: Second black matrix 318: Spacer

Claims

1. 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.

2. 2. The liquid crystal display device according to claim 1, wherein a plurality of the pixels are included within the display area.

3. 3. The liquid crystal display device according to claim 1, wherein the light-reflective matrix has a light-reflective thin film on the surface thereof.

4. 4. The liquid crystal display device according to claim 3, wherein the light-reflecting thin film is covered with a protective layer made of a transparent resin.

5. 5. A liquid crystal display device according to claim 3, wherein the light-reflecting thin film is made of a metal thin film of aluminum or an aluminum alloy.

6. 5. A liquid crystal display device according to claim 3, wherein the light-reflecting 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.

7. 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.

8. 8. The liquid crystal display device according to claim 7, wherein a plurality of light emitting elements are arranged inside the light emitting unit.

9. 9. The liquid crystal display device according to claim 8, wherein the light emitting element is a light emitting element that emits monochromatic light of blue or near ultraviolet.

10. 10. The liquid crystal display device according to claim 8, wherein the light emitting element is an LED.

11. 11. The liquid crystal display device according to claim 10, further comprising a wavelength conversion layer between the light emitting element and the colored filter, the wavelength conversion layer converting light emitted from the light emitting element into green light or red light.

12. 12. The liquid crystal display device according to claim 1, wherein the light scattering layer contains an ultraviolet absorber.

13. 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.

14. 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.

Images