Color filter substrate and display device

Abstract

This invention discloses a color filter substrate and a display device. The color filter substrate has a light-transmitting area, a light-shielding area, and an optical structure. Multiple light-transmitting areas are arranged in a matrix, and the light-shielding areas separate the light-transmitting areas from each other. The color filter substrate has a color resist layer in the light-transmitting area and a light-shielding structure in the light-shielding area. The optical structure is located on the side of the light-shielding structure away from the external environment. The optical structure guides the backlight from the light-shielding area to the light-transmitting area and out through it. By setting the optical structure on the color filter substrate, and positioning it on the side of the light-shielding structure away from the external environment, the optical structure can guide the backlight from the light-shielding area to the light-transmitting area and out through it, preventing the backlight from being absorbed by the light-shielding structure of the light-shielding area. This improves the light transmittance of the color filter substrate, thereby fully utilizing the backlight from the light-shielding area and increasing the utilization rate of the backlight.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a color filter substrate and a display device. Background Technology

[0002] Liquid crystal displays (LCDs) have numerous advantages, including thinness, energy efficiency, and no radiation, leading to their widespread use. Examples include LCD televisions, mobile phones, personal digital assistants (PDAs), digital cameras, computer screens, and laptop screens, where they dominate the flat panel display field.

[0003] Traditional liquid crystal display panels consist of a color filter substrate (CF), a thin film transistor array substrate (TFT array substrate), and a liquid crystal layer filled between the two substrates. Figure 1 This is a schematic diagram of a planar structure of an array substrate in a pixel region in the prior art. For example... Figure 1 As shown, the array substrate 10 is provided with scan lines 101, data lines 102, common electrode lines 103, gate, source and drain electrodes and other metal electrodes made of metal materials (such as molybdenum, aluminum and copper). Figure 2 This is a schematic diagram of the planar structure of a color filter substrate in a pixel region in the prior art. Figure 3 This is a schematic diagram of the optical path of a display device in the prior art. For example... Figure 2 and Figure 3 As shown, the color filter substrate 20 has multiple light-transmitting areas 210 arranged in an array and light-shielding areas 220 that separate the multiple light-transmitting areas 210 from each other. The color filter substrate 20 has a color resist layer 21 in the light-transmitting area 210. The color resist layer 21 includes color resist materials of red, green and blue, and corresponds to the sub-pixels of red, green and blue respectively. The area where the light-shielding area 220 is located is opaque. The color filter substrate 20 has a black matrix 22 or other light-shielding materials in the light-shielding area 220 to block light. The light-shielding area 220 corresponds to the area where these metal electrodes are located, so that the area where the metal electrodes are located can be blocked, but it will also have a certain blocking effect on the backlight, reducing the utilization rate of the backlight. Summary of the Invention

[0004] In order to overcome the shortcomings and deficiencies of the prior art, the present invention aims to provide a color filter substrate and a display device to solve the problem of poor light transmittance of the color filter substrate in the prior art.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] The present invention provides a color filter substrate, wherein the color filter substrate has a light-transmitting area, a light-shielding area and an optical structure, the plurality of light-transmitting areas are arranged in a matrix, the light-shielding area separates the plurality of light-transmitting areas from each other, the color filter substrate has a color resist layer in the light-transmitting area and a light-shielding structure in the light-shielding area, the optical structure is located on the side of the light-shielding structure away from the external environment, and the optical structure is used to guide the backlight of the light-shielding area to the light-transmitting area and emit it from the light-transmitting area.

[0007] Furthermore, the optical structure includes a raised structure layer and a refractive layer stacked on top of each other and having different refractive indices. The refractive layer covers the side of the raised structure layer away from the color filter substrate and is in contact with the surface of the raised structure layer. The raised structure layer has a plurality of raised structures on the side facing the refractive layer. The optical structure is used to refract the backlight of the light-shielding area to the light-transmitting area at the raised structures and emit it from the light-transmitting area.

[0008] Furthermore, the protruding structure corresponds to the light-transmitting area, and the refractive index of the protruding structure layer is greater than that of the refractive layer. The inclined surface of the protruding structure extends into the light-shielding area, and the optical structure converges the backlight rays from the light-shielding area toward the light-transmitting area.

[0009] Furthermore, the protruding structure corresponds to the light-shielding area, and the refractive index of the protruding structure layer is less than that of the refractive layer. The inclined surface of the protruding structure extends into the light-shielding area, and the optical structure diffuses the backlight of the light-shielding area toward the light-transmitting area.

[0010] Furthermore, the color filter substrate is also provided with a support pillar, which is located on the side of the refractive layer away from the raised structure layer. The support pillar and the refractive layer are made of the same material and the same masking process, or the support pillar and the refractive layer are made of different materials and different masking processes.

[0011] Furthermore, the optical structure includes a raised structure layer and a reflective layer. The raised structure layer has a plurality of raised structures corresponding to the light-shielding area on the side away from the color filter substrate. The reflective layer is disposed on the inclined surface of the raised structure. The reflective layer is used to reflect the backlight of the light-shielding area to the light-transmitting area and out of the light-transmitting area.

[0012] Furthermore, one portion of the inclined surface projected onto the color filter substrate is located within the light-shielding area, while the other portion extends into the light-transmitting area.

[0013] Furthermore, the optical structure is a light guide, which has an incident light surface and an exit light surface. The incident light surface extends into the light-shielding area, and the exit light surface is located in the light-transmitting area. The light guide is used to guide the light rays incident on the incident light surface to the exit light surface and exit from the exit light surface.

[0014] Furthermore, the light guide has one light-incident surface and two light-outcident surfaces, the width of the light-incident surface is greater than or equal to the width of the light-shielding area, and the two light-outcident surfaces are respectively located in the light-transmitting areas on both sides of the light-shielding area.

[0015] This application also provides a display device, including a color filter substrate as described above.

[0016] The beneficial effects of this invention are as follows: by setting an optical structure on the color filter substrate, the optical structure is located on the side of the light-shielding structure away from the external environment. The optical structure can guide the backlight of the light-shielding area to the light-transmitting area and emit it from the light-transmitting area, avoiding the backlight being absorbed by the light-shielding structure of the light-shielding area, thereby improving the light transmittance of the color filter substrate. This allows for full utilization of the backlight of the light-shielding area, thereby improving the utilization rate of the backlight. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a planar structure of an array substrate in a pixel region in the prior art;

[0018] Figure 2 This is a schematic diagram of the planar structure of a color filter substrate in a pixel region in the prior art;

[0019] Figure 3 This is a schematic diagram of the optical path of a display device in the prior art;

[0020] Figure 4 This is a schematic diagram of the color filter substrate in Embodiment 1 of the present invention;

[0021] Figure 5 This is a schematic diagram of the light path based on the principle of refraction;

[0022] Figure 6 This is a schematic diagram of the optical path of the optical structure in Embodiment 1 of the present invention;

[0023] Figure 7 This is a schematic diagram of the optical path of the color filter substrate in Embodiment 1 of the present invention;

[0024] Figures 8a-8c This is a schematic diagram of the structure of the color filter substrate fabrication method in Embodiment 1 of the present invention;

[0025] Figure 9 This is a schematic diagram of the color filter substrate in Embodiment 2 of the present invention;

[0026] Figure 10This is a schematic diagram of the optical path of the optical structure in Embodiment 2 of the present invention;

[0027] Figure 11 This is a schematic diagram of the optical path of the color filter substrate in Embodiment 2 of the present invention;

[0028] Figures 12a-12c This is a schematic diagram of the structure of the color filter substrate fabrication method in Embodiment 2 of the present invention;

[0029] Figure 13 This is one of the structural schematic diagrams of the color filter substrate in Embodiment 3 of the present invention;

[0030] Figure 14 This is the second schematic diagram of the structure of the color filter substrate in Embodiment 3 of the present invention;

[0031] Figure 15 This is the third schematic diagram of the structure of the color filter substrate in Embodiment 3 of the present invention;

[0032] Figure 16 This is a schematic diagram of the color filter substrate in Embodiment 4 of the present invention;

[0033] Figure 17 This is a schematic diagram of the optical path of the optical structure in Embodiment 4 of the present invention;

[0034] Figure 18 This is a schematic diagram of the optical path of the color filter substrate in Embodiment 4 of the present invention;

[0035] Figure 19 This is a schematic diagram of the color filter substrate in Embodiment 5 of the present invention;

[0036] Figure 20 This is a schematic diagram of the optical path of the optical structure in Embodiment 5 of the present invention;

[0037] Figure 21 This is a schematic diagram of the optical path of the color filter substrate in Embodiment 5 of the present invention;

[0038] Figure 22 This is a schematic diagram of the display device in the dark state according to the present invention;

[0039] Figure 23 This is a schematic diagram of the display device in the bright state in this invention. Detailed Implementation

[0040] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the specific implementation methods, structures, features, and effects of the color filter substrate and display device proposed according to the present invention are described in detail below with reference to the accompanying drawings and preferred embodiments:

[0041] [Example 1]

[0042] Figure 4This is a schematic diagram of the color filter substrate in Embodiment 1 of the present invention. Figure 4 As shown in Embodiment 1 of the present invention, a color filter substrate 20 is provided. The color filter substrate 20 has a light-transmitting area 210, a light-shielding area 220, and an optical structure 23. Multiple light-transmitting areas 210 are arranged in a matrix, and the light-shielding areas 220 space the multiple light-transmitting areas 210 apart. The color filter substrate 20 has a color resist layer 21 in the light-transmitting area 210 and a light-shielding structure in the light-shielding area 220. In this embodiment, the color resist layer 21 is a red (R), green (G), and blue (B) color resist material, which respectively forms red, green, and blue pixel units. The light-shielding structure is a black matrix 22 (BM) located between the red, green, and blue pixel units, so that adjacent pixel units are spaced apart by the black matrix 22.

[0043] Among them, the optical structure 23 is located on the side of the light-shielding structure away from the external environment (i.e., close to the backlight module 50). Figure 22 and Figure 23 On one side of the light-shielding structure 220, the optical structure 23 is used to guide the backlight of the light-shielding area 220 to the light-transmitting area 210 and out from the light-transmitting area 210. By providing the optical structure 23 on the color filter substrate 20, with the optical structure 23 located on the side of the light-shielding structure away from the external environment, the optical structure 23 can guide the backlight of the light-shielding area 220 to the light-transmitting area 210 and out from the light-transmitting area 210, avoiding the absorption of the backlight by the light-shielding structure of the light-shielding area 220, thereby improving the light transmittance of the color filter substrate 20, and thus making full use of the backlight of the light-shielding area 220 to improve the utilization rate of the backlight.

[0044] In this embodiment, the optical structure 23 includes a raised structure layer 231 and a refractive layer 232 stacked on top of each other and having different refractive indices. The refractive layer 232 covers the side of the raised structure layer 231 away from the color filter substrate 20 and is in contact with the surface of the raised structure layer 231. The raised structure layer 231 has multiple raised structures on the side facing the refractive layer 232. The optical structure 23 is used to refract the backlight of the light-shielding area 220 to the light-transmitting area 210 and out of the light-transmitting area 210 at the raised structures. By utilizing the difference in refractive indices between the raised structure layer 231 and the refractive layer 232, they can jointly refract light, thereby refracting the backlight of the light-shielding area 220 to the light-transmitting area 210 and out of the light-transmitting area 210, making full use of the backlight at the light-shielding area 220, thereby improving the utilization rate of the backlight and reducing the power consumption of the backlight module 50.

[0045] Figure 5 This is a schematic diagram of the light path based on the principle of refraction. When light passes through two media with different refractive indices at a certain angle, refraction occurs; of course, reflection also occurs to some extent. For example... Figure 5As shown, when light enters an optically less dense medium from an optically denser medium at a certain angle, refraction and reflection occur simultaneously. The angle of incidence θ1 is greater than the angle of refraction θ2, and the angle of incidence θ1 equals the angle of reflection θ3. The refractive index of the optically denser medium is n1, and the refractive index of the optically less dense medium is n2. Therefore, n1*sinθ1 = n2*sinθ2. Similarly, when light enters an optically denser medium from an optically less dense medium at a certain angle, refraction and reflection also occur, with the angle of incidence being less than the angle of refraction and equal to the angle of reflection.

[0046] In this embodiment, the protruding structure corresponds to the light-transmitting area 210. The refractive index of the protruding structure layer 231 is greater than that of the refractive layer 232. The inclined surface 231a of the protruding structure extends into the light-shielding area 220. The optical structure 23 converges the backlight rays of the light-shielding area 220 toward the light-transmitting area 210. Figure 6 This is a schematic diagram of the optical path of the optical structure layer in Embodiment 1 of the present invention, as shown below. Figure 6 As shown, since the refractive index of the raised structure layer 231 is greater than that of the refractive layer 232, when the backlight enters the raised structure layer 231 from the refractive layer 232, the angle of the light rays will converge toward the center of the raised structure, thereby converging the backlight rays of the light-shielding area 220 toward the light-transmitting area 210.

[0047] Furthermore, the width of the protruding structure is greater than the width of the light-transmitting area 210, so that a portion of the projection of the inclined surface 231a of the protruding structure onto the color filter substrate 20 is located within the light-shielding area 220, while the other portion extends into the light-transmitting area 210. This concentrates more backlight rays from the light-shielding area 220 towards the light-transmitting area 210, thereby making fuller use of the backlight rays at the light-shielding area 220. Optionally, adjacent protruding structures are distributed without gaps, such that the inclined surfaces 231a of adjacent protruding structures are in contact with each other. Of course, in other embodiments, the projections of the inclined surfaces 231a onto the color filter substrate 20 may also be located entirely within the light-shielding area 220, with the width of the projections of the two inclined surfaces 231a onto the color filter substrate 20 equal to the width of the light-shielding area 220, and the corresponding area of ​​the light-transmitting area 210 having no inclined surfaces 231a. Alternatively, adjacent protruding structures may have a small gap.

[0048] Furthermore, the cross-sectional shape of the protruding structure can be trapezoidal, triangular, or arc-shaped, ensuring that the refractive surface of the protruding structure has a certain angle with most of the backlight rays, causing refraction when the backlight rays enter the protruding structure from the refractive layer 232. The tilt angle or curvature of the refractive surface of the protruding structure can be set according to actual needs, so that most of the backlight rays at the light-shielding area 220 are refracted to the light-transmitting area 210 and emitted. The height of the protruding structure is ≥0.5µm, and its thickness can be set according to the tilt angle or curvature of the refractive surface and the width of the protruding structure. In this embodiment, the cross-sectional shape of the protruding structure is, for example, trapezoidal. The protruding structure has a bottom surface, two inclined surfaces 231a, and a top surface 231b. The bottom surface of the protruding structure is in contact with the surface of the color filter substrate 20, and the width of the bottom surface is greater than the width of the light-transmitting area 210. The width of the top surface 231b is less than the width of the light-transmitting area 210, so that a portion of the inclined surface 231a of the protruding structure is located within the light-shielding area 220, and the other portion extends into the light-transmitting area 210. The inclined surface 231a is a plane and forms a certain angle with the surface of the color filter substrate 20. The bottom surface and the top surface 231b are both planes and parallel to the surface of the color filter substrate 20.

[0049] Figure 7 This is a schematic diagram of the optical path of the color filter substrate in Embodiment 1 of the present invention. Figure 7 As shown, when the backlight beam is directed toward the color filter substrate 20, the backlight beam of the light-transmitting area 210 can basically pass directly through the color filter substrate 20; the backlight beam of the light-shielding area 220, after being refracted by the refractive layer 232 and the protrusion structure, bypasses the light-shielding structure and is emitted from the light-transmitting area 210.

[0050] Furthermore, the color filter substrate 20 is also provided with support pillars 24. The support pillars 24 are located on the side of the refractive layer 232 away from the raised structure layer 231. The support pillars 24 and the refractive layer 232 are made of the same material and are manufactured using the same mask process, thereby simplifying the manufacturing process. The support pillars 24 include a first support pillar 241 and a second support pillar 242. The height of the first support pillar 241 is less than the height of the second support pillar 242. The first support pillar 241 is usually located in the non-display area at the edge, while the second support pillar 242 is usually located in the display area.

[0051] Figures 8a-8c This is a schematic diagram of the structure of the color filter substrate fabrication method in Embodiment 1 of the present invention. Figures 8a-8c As shown, the fabrication method of the color filter substrate 20 is as follows:

[0052] like Figure 8aAs shown, a substrate is provided, which may be made of materials such as glass, quartz, silicon, acrylic, or polycarbonate. The substrate may also be a flexible substrate, and suitable materials for flexible substrates include, for example, polyethersulfone (PES), polyethylene naphthalate (PEN), polyethylene (PE), polyimide (PI), polyvinyl chloride (PVC), polyethylene terephthalate (PET), or combinations thereof.

[0053] A patterned color resist layer 21 and a black matrix 22 are formed on the substrate. The color resist layer 21 is a color resist material of red (R), green (G) and blue (B), which respectively form red, green and blue pixel units. The black matrix 22 is used to separate multiple color resist layers 21 from each other.

[0054] like Figure 8b As shown, a patterned protrusion structure layer 231 is formed above the substrate. The protrusion structure layer 231 has multiple protrusion structures, which correspond to the light-transmitting area 210. The protrusion structure layer 231 can be fabricated using a nanoimprinting process, and the protrusion structure layer 231 can be made of UV adhesive material, OC, or photoresist material.

[0055] like Figure 8c As shown, a support layer covering the protruding structure layer 231 is formed on the substrate. The support layer is etched to form a refractive layer 232 and a support pillar 24. The support layer can planarize the protruding structure layer 231 and also form a refractive index difference with the protruding structure layer 231, thereby producing a refractive phenomenon.

[0056] [Example 2]

[0057] Figure 9 This is a schematic diagram of the color filter substrate in Embodiment 2 of the present invention. Figure 9 As shown, the color filter substrate provided in Embodiment 2 of the present invention is similar to that in Embodiment 1. Figures 4 to 7 The color filter substrates in this embodiment are basically the same, except that in this embodiment:

[0058] The raised structure corresponds to the light-shielding area 220 and the refractive index of the raised structure layer 231 is less than that of the refractive layer 232. The inclined surface 231a of the raised structure extends into the light-shielding area 220. The optical structure 23 diffuses the backlight of the light-shielding area 220 toward the light-transmitting area 210. Figure 10 This is a schematic diagram of the optical path of the optical structure layer in Embodiment 2 of the present invention, as shown below. Figure 10 As shown, since the refractive index of the raised structure layer 231 is less than that of the refractive index of the refractive layer 232, the backlight rays will be scattered towards both sides of the raised structure after entering the raised structure layer 231 from the refractive layer 232, thereby scattering the backlight rays of the light-shielding area 220 towards the light-transmitting area 210.

[0059] Furthermore, the width of the protruding structure is greater than the width of the light-shielding area 220, so that a portion of the projection of the inclined surface 231a of the protruding structure onto the color filter substrate 20 lies within the light-shielding area 220, while the other portion extends into the light-transmitting area 210. This concentrates more backlight rays from the light-shielding area 220 toward the light-transmitting area 210, thereby making fuller use of the backlight rays at the light-shielding area 220. Optionally, there is a gap between two adjacent protruding structures, and the width of the gap can be slightly smaller than the width of the light-transmitting area 210.

[0060] Furthermore, the cross-sectional shape of the protruding structure can be trapezoidal, triangular, or arc-shaped, ensuring that the refractive surface of the protruding structure has a certain angle with most of the backlight rays, causing refraction when the backlight rays enter the protruding structure from the refractive layer 232. The tilt angle or curvature of the refractive surface of the protruding structure can be set according to actual needs, so that most of the backlight rays at the light-shielding area 220 are refracted to the light-transmitting area 210 and emitted. The height of the protruding structure is ≥0.5µm, and its thickness can be set according to the tilt angle or curvature of the refractive surface and the width of the protruding structure. In this embodiment, the cross-sectional shape of the protruding structure is, for example, trapezoidal. The protruding structure has a bottom surface, two inclined surfaces 231a, and a top surface 231b. The bottom surface of the protruding structure is in contact with the surface of the color filter substrate 20, and the width of the bottom surface is greater than the width of the light-shielding area 220. The width of the top surface 231b is less than the width of the light-shielding area 220, so that a portion of the inclined surface 231a of the protruding structure is located within the light-shielding area 220, and the other portion extends into the light-transmitting area 210. The inclined surface 231a is a plane and forms a certain angle with the surface of the color filter substrate 20. The bottom surface and the top surface 231b are both planes and are parallel to the surface of the color filter substrate 20.

[0061] Figure 11 This is a schematic diagram of the optical path of the color filter substrate in Embodiment 2 of the present invention. Figure 11 As shown, when the backlight beam is directed toward the color filter substrate 20, the backlight beam of the light-transmitting area 210 can basically pass directly through the color filter substrate 20; the backlight beam of the light-shielding area 220, after being refracted by the refractive layer 232 and the protrusion structure, bypasses the light-shielding structure and is emitted from the light-transmitting area 210.

[0062] Figures 12a-12c This is a schematic diagram of the structure of the color filter substrate fabrication method in Embodiment 2 of the present invention. Figures 12a-12c As shown, the fabrication method of the color filter substrate 20 is as follows:

[0063] like Figure 12aAs shown, a substrate is provided, which may be made of materials such as glass, quartz, silicon, acrylic, or polycarbonate. The substrate may also be a flexible substrate, and suitable materials for flexible substrates include, for example, polyethersulfone (PES), polyethylene naphthalate (PEN), polyethylene (PE), polyimide (PI), polyvinyl chloride (PVC), polyethylene terephthalate (PET), or combinations thereof.

[0064] A patterned color resist layer 21 and a black matrix 22 are formed on the substrate. The color resist layer 21 is a color resist material of red (R), green (G) and blue (B), which respectively form red, green and blue pixel units. The black matrix 22 is used to separate multiple color resist layers 21 from each other.

[0065] like Figure 12b As shown, a patterned protrusion structure layer 231 is formed above the substrate. The protrusion structure layer 231 has multiple protrusion structures, which correspond to the light-transmitting area 210. The protrusion structure layer 231 can be fabricated using a nanoimprinting process, and the protrusion structure layer 231 can be made of UV adhesive material, OC, or photoresist material.

[0066] like Figure 12c As shown, a support layer covering the protruding structure layer 231 is formed on the substrate. The support layer is etched to form a refractive layer 232 and a support pillar 24. The support layer can planarize the protruding structure layer 231 and also form a refractive index difference with the protruding structure layer 231, thereby producing a refractive phenomenon.

[0067] Those skilled in the art should understand that the remaining structures and working principles of this embodiment are the same as those of Embodiment 1, and will not be repeated here.

[0068] [Example 3]

[0069] Figure 13 This is one of the structural schematic diagrams of the color filter substrate in Embodiment 3 of the present invention. Figure 14 This is the second schematic diagram of the structure of the color filter substrate in Embodiment 3 of the present invention. Figure 15 This is the third schematic diagram of the color filter substrate in Embodiment 3 of the present invention. Figures 13 to 15 As shown, the color filter substrate provided in Embodiment 3 of the present invention is similar to that in Embodiment 1. Figures 4 to 7 Example 2 Figures 9 to 11 The color filter substrates in this embodiment are basically the same, except that in this embodiment:

[0070] The color filter substrate 20 is also provided with support pillars 24. The support pillars 24 are located on the side of the refractive layer 232 away from the raised structure layer 231. The support pillars 24 and the refractive layer 232 are made of different materials and different masking processes. The refractive layer 232 can be made of UV adhesive, OC, or photoresist material, and the support pillars 24 are made of a support material with support properties. The support pillars 24 include a first support pillar 241 and a second support pillar 242. The height of the first support pillar 241 is less than the height of the second support pillar 242. The first support pillar 241 is usually located in the non-display area at the edge, and the second support pillar 242 is usually located in the display area.

[0071] like Figure 14 As shown, in another embodiment, the light-shielding structure includes multiple color-resistive materials that are stacked on top of each other and have different colors. For example, the light-shielding structure can be formed by stacking two color-resistive materials in the light-transmitting areas 210 on both sides, thereby achieving a light-shielding effect and simplifying the manufacturing process. Figure 15 As shown, in another embodiment, the inclined surface 231a of the protruding structure can also be an arc surface, and its curvature can be set according to actual needs, so that more backlight in the shading area 220 can be converged toward the light-transmitting area 210, so as to make full use of the backlight in the shading area 220.

[0072] Those skilled in the art should understand that the remaining structures and working principles of this embodiment are the same as those of Embodiment 1 and Embodiment 2, and will not be repeated here.

[0073] [Example 4]

[0074] Figure 16 This is a schematic diagram of the color filter substrate in Embodiment 4 of the present invention. Figure 16 As shown, the color filter substrate provided in Embodiment 4 of the present invention is similar to that in Embodiment 1 ( Figures 4 to 7 Example 2 Figures 9 to 11 Example 3 Figures 13 to 15 The color filter substrates in this embodiment are basically the same, except that in this embodiment:

[0075] The optical structure 23 includes a raised structure layer 231 and a reflective layer 233. The raised structure layer 231 has a plurality of raised structures on the side away from the color filter substrate 20, which are corresponding to the light-shielding area 220. The reflective layer 233 is disposed on the inclined surface 231a of the raised structure. The reflective layer 233 is used to reflect the backlight of the light-shielding area 220 to the light-transmitting area 210 and out of the light-transmitting area 210. Figure 17 This is a schematic diagram of the optical path of the optical structure in Embodiment 4 of the present invention, as shown below. Figure 17As shown, the reflective layer 233 reflects light to the light-transmitting area 210, making full use of the backlight in the light-shielding area 220 to improve its utilization rate and reduce the power consumption of the backlight module. In this embodiment, since the reflective layer 233 is used to reflect the backlight in the light-shielding area 220 to the light-transmitting area 210, the refractive layer 232 is not required, or a planarization layer can be used instead to planarize the raised structure layer 231.

[0076] Furthermore, the width of the protruding structure is greater than the width of the light-shielding area 220, so that a portion of the projection of the inclined surface 231a of the protruding structure onto the color filter substrate 20 lies within the light-shielding area 220, while the other portion extends into the light-transmitting area 210. This allows more backlight rays from the light-shielding area 220 to be reflected towards the light-transmitting area 210, thus making fuller use of the backlight rays at the light-shielding area 220. Optionally, there is a gap between two adjacent protruding structures, and the width of the gap can be slightly smaller than the width of the light-transmitting area 210.

[0077] Furthermore, the cross-sectional shape of the protruding structure can be trapezoidal, triangular, arc-shaped, etc., to ensure that the reflective surface of the protruding structure has a certain angle with most of the backlight. The tilt angle or curvature of the refracting surface of the protruding structure can be set according to actual needs, so that most of the backlight at the light-shielding area 220 is reflected to the light-transmitting area 210 and emitted. The height of the protruding structure is ≥0.5µm, and its thickness can be set according to the tilt angle or curvature of the refracting surface and the width of the protruding structure. In this embodiment, the cross-sectional shape of the protruding structure is, for example, trapezoidal. The protruding structure has a bottom surface, two inclined surfaces 231a, and a top surface 231b. The bottom surface of the protruding structure is in contact with the surface of the color filter substrate 20, and the width of the bottom surface is greater than the width of the light-shielding area 220. The width of the top surface 231b is less than the width of the light-shielding area 220, so that a portion of the inclined surface 231a of the protruding structure is located within the light-shielding area 220, and the other portion extends into the light-transmitting area 210. The inclined surface 231a is flat and forms a certain angle with the surface of the color filter substrate 20, while the bottom and top surfaces 231b are both flat and parallel to the surface of the color filter substrate 20. The inclined surface 231a of the protruding structure can be flat or curved, thus ensuring that the inclined surface 231a has a certain angle with most of the backlight, allowing the backlight from the light-shielding area 220 to be reflected from the reflective layer 233 to the light-transmitting area 210. The tilt angle or curvature of the inclined surface 231a can be set according to actual needs, so that most of the backlight at the light-shielding area 220 is reflected to the light-transmitting area 210 and emitted.

[0078] Figure 18 This is a schematic diagram of the optical path of the display device in Embodiment 4 of the present invention. Figure 18As shown, when the backlight beam is directed toward the color filter substrate 20, the backlight beam of the light-transmitting area 210 passes directly through the color filter substrate 20 and exits from the color filter substrate 20; the backlight beam of the light-shielding area 220, after being reflected by the reflective layer 233, bypasses the light-shielding area 220 and exits from the light-transmitting area 210.

[0079] Those skilled in the art should understand that the remaining structures and working principles of this embodiment are the same as those of Embodiment 1, Embodiment 2, and Embodiment 3, and will not be repeated here.

[0080] [Example 5]

[0081] Figure 19 This is a schematic diagram of the structure of the color filter substrate in Embodiment 5 of the present invention. Figure 20 This is a schematic diagram of the optical path of the optical structure in Embodiment 5 of the present invention. Figure 19 and Figure 20 As shown, the color filter substrate provided in Embodiment 5 of the present invention is similar to that in Embodiment 1 ( Figures 4 to 7 Example 2 Figures 9 to 11 Example 3 Figures 13 to 15 Example 4 Figures 16 to 18 The color filter substrates in this embodiment are basically the same, except that in this embodiment:

[0082] Optical structure 23 is a light guide, which corresponds to the light-shielding area 220. For example... Figure 20 As shown, the light guide has an incident surface 235 and an exiting surface 234. The incident surface 235 extends into the light-shielding area 220, and the exiting surface 234 is located within the light-transmitting area 210. The light guide is used to guide the light entering through the incident surface 235 to the exiting surface 234 and out through it. The principle of the light guide is similar to that of a light guide plate and an optical fiber. The other surfaces of the light guide, except for the incident surface 235 and the exiting surface 234, are provided with a reflective coating to ensure that the light entering through the incident surface 235 can be guided to the exiting surface 234 and out through it. In this embodiment, since the backlight of the light-shielding area 220 is guided to the light-transmitting area 210 by the light guide, it is not necessary to provide a raised structure layer 231 and a refractive layer 232; only a planarization layer is needed to planarize the light guide.

[0083] Furthermore, the light guide has one light-incident surface 235 and two light-outcrystal surfaces 234. The width of the light-incident surface 235 is greater than or equal to the width of the light-shielding area 220. The two light-outcrystal surfaces 234 are located in the light-transmitting areas 210 on both sides of the light-shielding area 220, so as to converge more backlight in the light-shielding area 220 toward the light-transmitting area 210, so as to make fuller use of the backlight in the light-shielding area 220.

[0084] Figure 21 This is a schematic diagram of the optical path of the color filter substrate in Embodiment 1 of the present invention. Figure 21 As shown, when the backlight beam is directed toward the color filter substrate 20, the backlight beam of the light-transmitting area 210 can basically pass directly through the color filter substrate 20; the backlight beam of the light-shielding area 220, after being guided by the light guide, bypasses the light-shielding structure and is emitted from the light-transmitting area 210.

[0085] Those skilled in the art should understand that the remaining structures and working principles of this embodiment are the same as those of Embodiment 1, Embodiment 2, Embodiment 3, and Embodiment 4, and will not be repeated here.

[0086] Figure 22 This is a schematic diagram of the display device in the dark state in this invention. Figure 23 This is a schematic diagram of the display device in the present invention in the illuminated state. (See attached diagram.) Figure 22 and Figure 23 As shown, this application also provides a display panel, including an array substrate 10, a color filter substrate 20 disposed opposite to the array substrate 10, and a liquid crystal layer 30 located between the array substrate 10 and the color filter substrate 20. The color filter substrate 20 is the color filter substrate 20 described above.

[0087] The liquid crystal layer 30 uses positive liquid crystal molecules, that is, liquid crystal molecules with positive dielectric anisotropy, such as... Figure 6 As shown, in the initial state, the positive liquid crystal molecules in the liquid crystal layer 30 are aligned parallel to the color filter substrate 20 and the array substrate, and the alignment direction of the positive liquid crystal molecules near the color filter substrate 20 is opposite to that of the positive liquid crystal molecules near the array substrate. Of course, in other embodiments, the liquid crystal layer 30 can also use negative liquid crystal molecules, and the negative liquid crystal molecules in the liquid crystal layer 30 can be aligned perpendicular to the color filter substrate 20 and the array substrate, that is, similar to the alignment method of VA display mode.

[0088] The array substrate 10 has multiple pixel units defined by multiple scan lines and multiple data lines that are mutually insulated and intersecting on the side facing the liquid crystal layer 30. The light-shielding area 220 corresponds vertically to the scan lines and data lines. Each pixel unit is provided with a pixel electrode 111 and a thin-film transistor. The pixel electrode 111 is electrically connected to the data line of the adjacent thin-film transistor through the thin-film transistor. The thin-film transistor includes a gate, an active layer, a drain, and a source. The gate and the scan line are located on the same layer and are electrically connected. The gate and the active layer are isolated by an insulating layer. The source is electrically connected to the data line. The drain is electrically connected to the pixel electrode 111 through a contact hole.

[0089] In this embodiment, a common electrode 112 is further provided on the side of the array substrate 10 facing the liquid crystal layer 30. The common electrode 112 and the pixel electrode 111 are located on different layers and are insulated and isolated by an insulating layer. The common electrode 112 may be located above or below the pixel electrode 111. Figure 22The diagram shows the common electrode 112 located above the pixel electrode 111. Preferably, the common electrode 112 is disposed across the entire surface and has a slit in the pixel unit region, while the pixel electrode 111 is a slit electrode with multiple electrode strips in each pixel unit to form a fringe field switching (FFS) mode. Of course, in other embodiments, the pixel electrode 111 and the common electrode 112 are located on the same layer, but they are insulated from each other. Both the pixel electrode 111 and the common electrode 112 may include multiple electrode strips, and the electrode strips of the pixel electrode 111 and the electrode strips of the common electrode 112 are arranged alternately to form an in-plane switching (IPS) mode. Alternatively, the array substrate 10 has a pixel electrode 111 on the side facing the liquid crystal layer 30, and the color filter substrate 11 has a common electrode 112 on the side facing the liquid crystal layer 30 to form a TN mode or a VA mode. For further descriptions of the TN mode and VA mode, please refer to the prior art, which will not be repeated here.

[0090] Furthermore, an upper polarizer 41 is provided on the side of the color filter substrate 20 away from the liquid crystal layer 30, and a lower polarizer 42 is provided on the side of the array substrate away from the liquid crystal layer 30. The light transmission axis of the upper polarizer 41 and the light transmission axis of the lower polarizer 42 are perpendicular to each other.

[0091] The present invention also provides a display device, a display panel and a backlight module 50, wherein the backlight module 50 is located below the display panel and is used to provide a backlight source for the display panel.

[0092] The backlight module 50 can be an edge-lit backlight module or a direct-lit backlight module. Preferably, the backlight module 50 adopts a collimated backlight (CBL) mode, which can collect light and ensure display effect.

[0093] The backlight module 50 includes a backlight source 51 and a privacy layer 53, which reduces the range of light emission angles. A brightness enhancement film 52 is also provided between the backlight source 51 and the privacy layer 53, increasing the brightness of the backlight module 50. The privacy layer 53 acts like a miniature venetian blind, blocking light with a large incident angle while allowing light with a smaller incident angle to pass through, thus reducing the range of light angles passing through the privacy layer 53. The privacy layer 53 includes multiple parallel light-blocking walls and light-transmitting holes located between adjacent light-blocking walls. Light-absorbing material is provided on both sides of the light-blocking walls. Alternatively, the backlight source 51 can be a light-collecting backlight, eliminating the need for a privacy layer 53; however, light-collecting backlights are more expensive than conventional backlights.

[0094] In this document, the directional terms such as up, down, left, right, front, and back are defined according to the position of the structures in the accompanying drawings and the relative positions of the structures, and are only used for clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application. It should also be understood that the terms "first" and "second," etc., used herein are only used for distinction in name and are not used to limit the number or order.

[0095] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content without departing from the scope of the technical solution of the present invention, which are equivalent embodiments with equivalent changes. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the technical solution of the present invention shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A color filter substrate, characterized in that, The color filter substrate (20) is provided with a light-transmitting area (210), a light-shielding area (220) and an optical structure (23). The multiple light-transmitting areas (210) are arranged in a matrix. The light-shielding area (220) separates the multiple light-transmitting areas (210) from each other. The color filter substrate (20) is provided with a color resist layer (21) in the light-transmitting area (210) and a light-shielding structure in the light-shielding area (220). The optical structure (23) is located on the side of the light-shielding structure away from the external environment. The optical structure (23) is used to guide the backlight of the light-shielding area (220) to the light-transmitting area (210) and out from the light-transmitting area (210). The optical structure (23) is a light guide, which has an incident surface (235) and an exit surface (234). The incident surface (235) extends into the light-shielding area (220), and the exit surface (234) is located in the light-transmitting area (210). The light guide is used to guide the light entering through the incident surface (235) to the exit surface (234) and out through the exit surface (234). The light guide has one incident surface (235) and two exit surfaces (234). The width of the incident surface (235) is greater than or equal to the width of the light-shielding area (220), and the two exit surfaces (234) are located in the light-transmitting areas (210) on both sides of the light-shielding area (220).

2. A display device, characterized in that, Includes the color filter substrate (20) as described in claim 1.

Images