Color film substrate, display panel and display device

Abstract

The utility model provides a color film substrate, a display panel and a display device. The color film substrate comprises a substrate, a shading layer, an auxiliary layer and a color film layer. Wherein the shading layer is positioned on one side of the substrate and is provided with a plurality of open holes which are formed at intervals. The auxiliary layer and the shading layer are located on the same side of the substrate, and at least part of the auxiliary layer is filled in the opening of the shading layer; the color film layer is located on the side, away from the substrate, of the auxiliary layer and comprises a plurality of color film blocks, and the edge of the orthographic projection of each hole on the substrate is located on the inner side of the edge of the orthographic projection of one color film block on the substrate. When the color film substrate is applied to the display panel, the lowest brightness of the display panel can be reduced or the contrast ratio of the display panel can be improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a color film substrate, a display panel, and a display device. Background Art

[0002] The LCD display panel includes an array substrate and a color filter substrate located on the array substrate. The color filter substrate includes a substrate, a light-shielding layer located on the side of the substrate facing the array substrate, and a color filter layer. The light-shielding layer is provided with a plurality of openings. The color filter layer includes a plurality of color filter blocks. Part of the color filter blocks are located within the light-shielding layer, and part of the color filter blocks are located on the side of the light-shielding layer away from the substrate and surround the openings, so that the portion of the color filter block surrounding the openings protrudes toward the array substrate relative to the portion located within the openings.

[0003] When the color filter substrate and the array substrate are set in a box, the above structure of the color filter block will affect the rotation of the liquid crystal at the edge of the sub-pixel, resulting in a poor overall black effect of the display panel when the screen is turned off, and further, resulting in poor contrast of the display panel. Utility Model Content

[0004] In response to the shortcomings of the related art, the present application proposes a color film substrate, a display panel and a display device to solve the problem in the related art that the color film blocks form a step difference, resulting in a poor integrated black effect of the display panel when the screen is off or poor contrast when the screen is on.

[0005] The present invention provides a color filter substrate comprising a substrate, a light-shielding layer, an auxiliary layer, and a color filter layer. The light-shielding layer is located on one side of the substrate and has a plurality of spaced-apart openings. The auxiliary layer and the light-shielding layer are located on the same side of the substrate, with at least a portion of the auxiliary layer filling the openings of the light-shielding layer. The color filter layer is located on a side of the auxiliary layer away from the substrate and comprises a plurality of color filter blocks, with the edge of the orthographic projection of each opening on the substrate located inward of the edge of the orthographic projection of a color filter block on the substrate.

[0006] In some embodiments, the auxiliary layer includes a plurality of auxiliary blocks, which are filled in the openings of the light-shielding layer. In the direction from the substrate to the light-shielding layer, the thickness of the auxiliary blocks is less than or equal to the thickness of the light-shielding layer.

[0007] In some embodiments, the auxiliary layer includes a plurality of auxiliary blocks, which are filled in the openings of the light-shielding layer. In the direction from the substrate to the light-shielding layer, the maximum distance between the surface of the auxiliary block away from the substrate and the substrate is greater than the distance between the surface of the light-shielding layer away from the substrate and the substrate. In the direction from the substrate to the light-shielding layer, the cross-sectional area of ​​the portion of the auxiliary block that is higher than the surface of the light-shielding layer away from the substrate gradually decreases, and the cross-section is parallel to the surface of the substrate facing the light-shielding layer.

[0008] In some embodiments, the surface of the auxiliary block away from the substrate is in the shape of a curved surface or a flat surface.

[0009] In some embodiments, in the direction from the substrate to the light-shielding layer, the thickness of the auxiliary layer is greater than the thickness of the light-shielding layer; the auxiliary layer includes a first part and a second part that are stacked, a surface of the first part facing away from the substrate is flush with a surface of the light-shielding layer facing away from the substrate, a surface of the second part facing the substrate is flush with a surface of the light-shielding layer facing away from the substrate, the first part fills the opening of the light-shielding layer, and at least part of the second part covers the surface of the light-shielding layer away from the substrate.

[0010] In some embodiments, a surface of the auxiliary layer away from the substrate is a continuous plane.

[0011] In some embodiments, the auxiliary layer includes a plurality of auxiliary blocks, and the surface of each of the auxiliary blocks away from the substrate is flat. Each of the auxiliary blocks includes a third part and a fourth part that are stacked. The surface of the third part facing away from the substrate is flush with the surface of the light-shielding layer facing away from the substrate, and the surface of the fourth part facing the substrate is flush with the surface of the light-shielding layer facing away from the substrate. The third part of the auxiliary block fills the opening of the light-shielding layer, and at least part of the fourth part of the auxiliary block covers the surface of the light-shielding layer away from the substrate; in the direction from the substrate to the light-shielding layer, the thickness of the part of the auxiliary block covering the light-shielding layer is less than the thickness of the light-shielding layer.

[0012] In some embodiments, the refractive index of the material of the auxiliary layer is greater than or equal to the refractive index of the material of the color filter block.

[0013] In some embodiments, the auxiliary layer has a Vickers hardness greater than or equal to 35 HV.

[0014] In some embodiments, the material of the auxiliary layer includes at least one of acrylic polymer, silicone polymer, polyimide, polyethylene terephthalate, polystyrene, indium tin oxide, silicon dioxide, silicon nitride, and aluminum oxide.

[0015] The present application also provides a display panel, comprising the color film substrate as described above.

[0016] The present application also provides a display device, comprising the display panel as described above.

[0017] The beneficial effects of this application include:

[0018] In this embodiment, an auxiliary layer is added to the color filter substrate to reduce the step difference between the surface of the light-shielding layer away from the substrate and the surface of the substrate close to the light-shielding layer, thereby avoiding the uneven surface formed by the step difference on the surface of the color filter substrate to interfere with the rotation of the liquid crystal. As a result, the uncontrolled liquid crystal can be avoided, thereby avoiding the problem of uncontrolled light brightness caused by abnormal deflection of the liquid crystal. It can further ensure that the brightness of the display panel is controlled to the minimum when the display panel is turned off, that is, the minimum brightness of the display panel is reduced, which can improve the integrated black effect of the display panel when the color filter substrate forms a display panel. At the same time, since the contrast of the display panel is equal to the ratio of the highest brightness to the lowest brightness on the display panel, the contrast of the image displayed by the display panel can also be improved.

[0019] Additional aspects and advantages of the present application will be given in part in the following description, which will become apparent from the following description, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0021] Figure 1 Shown is a schematic structural diagram of a display panel in related art;

[0022] Figure 2 FIG2 is a schematic structural diagram of a color filter substrate provided by an exemplary embodiment of the present application;

[0023] Figure 3 FIG2 is a schematic structural diagram of a color filter substrate provided by an exemplary embodiment of the present application;

[0024] Figure 4 FIG2 is a schematic structural diagram of a color filter substrate provided by an exemplary embodiment of the present application;

[0025] Figure 5 FIG2 is a schematic structural diagram of a color filter substrate provided by an exemplary embodiment of the present application;

[0026] Figure 6 FIG2 is a schematic structural diagram of a color filter substrate provided by an exemplary embodiment of the present application;

[0027] Figure 7 FIG2 is a schematic structural diagram of a color filter substrate provided by an exemplary embodiment of the present application;

[0028] Figure 8 The figure shows a schematic diagram of the layout structure of a light shielding layer provided by an exemplary embodiment of the present application;

[0029] Figure 9 FIG2 is a schematic diagram of a layout structure in which a color filter layer is provided on a light-shielding layer according to an exemplary embodiment of the present application;

[0030] Figure 10 FIG2 is a schematic diagram of a layout structure in which a color filter layer is provided on a light-shielding layer according to an exemplary embodiment of the present application;

[0031] Figure 11 FIG2 is a schematic structural diagram of a color filter substrate provided by an exemplary embodiment of the present application;

[0032] Figures 12a to 12c 1 is a schematic structural diagram of each step of a method for preparing a color filter substrate provided by an exemplary embodiment of the present application;

[0033] Figures 13a to 13g 1 is a schematic structural diagram of each step of a method for preparing a color filter substrate provided by an exemplary embodiment of the present application;

[0034] Figure 14 FIG2 is a schematic structural diagram of a display panel provided by an exemplary embodiment of the present application;

[0035] Figure 15 Shown is a schematic structural diagram of a display device provided by an exemplary embodiment of the present application.

[0036] In the figure: 1-substrate; 2-light-shielding layer; 2a-opening 3-color filter layer; 3a-first color filter block (color filter block); 3b-second color filter block (color filter block); 3c-third color filter block (color filter block); 4-planarization layer; 5-auxiliary layer; 51-auxiliary block; 5a-auxiliary layer film; 6-photoresist; 7-mask; 10-color filter substrate; 20-array substrate; 30-liquid crystal; 40-spacer; 100-display panel; 200-housing. DETAILED DESCRIPTION

[0037] like Figure 1As shown, the LCD display panel includes a color filter substrate 10' and an array substrate 20' arranged in a box, and a liquid crystal 30' located between the color filter substrate 10' and the array substrate 20'. The color filter substrate 10' includes a substrate 1', a light shielding layer 2', a color filter layer 3' and a planarization layer 4' stacked in sequence. The light shielding layer 2' is provided with a plurality of spaced openings 2a'. The color filter layer 3' includes a plurality of color filter blocks. Figure 1 Only one color filter block is shown as an example. There is a certain overlap between each color filter block and the light-shielding layer 2'. In this overlap, the light-shielding layer 2' has a certain thickness, which causes a step difference (PW / PH) in the color filter layer 3'. When the planarization layer 4' is laid on the side of the color filter layer 3' away from the light-shielding layer 2', if the planarization layer 4' is thin, the planarization effect of the planarization layer 4' will be poor, and the surface of the planarization layer 4' away from the color filter layer 3' will become uneven. When the color filter substrate 10' and the array substrate 20' are aligned, this affects the rotation of the liquid crystal between the color filter substrate 10' and the array substrate 20', resulting in the display panel having a poor black effect when the screen is off or poor contrast when the screen is on.

[0038] The color film substrate, display panel, and display device provided in this application are intended to solve the above-mentioned technical problems in related technologies.

[0039] The color filter substrate, display panel, and display device in the embodiments of the present application are described in detail below with reference to the accompanying drawings. In the absence of conflict, the features in the following embodiments can complement or be combined with each other.

[0040] It should be noted that, for ease of explanation, the drawings use x-direction, y-direction and z-direction to indicate the directional correspondence of each drawing, and the x-direction, y-direction and z-direction together constitute a three-dimensional rectangular coordinate system.

[0041] like Figures 2 to 8 As shown, an embodiment of the present application provides a color filter substrate 10, comprising a substrate 1, a light-shielding layer 2, an auxiliary layer 5, and a color filter layer 3. The light-shielding layer 2 is located on one side of the substrate 1 and is provided with a plurality of spaced-apart openings 2a. The auxiliary layer 5 and the light-shielding layer 2 are located on the same side of the substrate 1, with at least a portion of the auxiliary layer 5 filling the openings 2a of the light-shielding layer 2. The color filter layer 3 is located on the side of the auxiliary layer 5 away from the substrate 1 and comprises a plurality of color filter blocks 3a, 3b, and 3c. The edge of the orthographic projection of each opening 2a on the substrate 1 is located inside the edge of the orthographic projection of a color filter block 3a / 3b / 3c on the substrate 1.

[0042] In this embodiment, an auxiliary layer 5 is added to the color filter substrate 10 to reduce the step difference between the side surface of the light-shielding layer 2 away from the substrate 1 and the side surface of the substrate 1 close to the light-shielding layer 2, thereby avoiding as much as possible the uneven surface formed by the step difference on the surface of the color filter substrate 10 when the color filter substrate 10 forms a display panel, causing interference to the rotation of the liquid crystal 30. As a result, the uncontrolled liquid crystal 30 can be avoided, thereby avoiding the problem of uncontrolled light brightness caused by abnormal deflection of the liquid crystal 30, and thus further ensuring that the brightness of the display panel is controlled to the minimum when the display panel is turned off, that is, reducing the minimum brightness of the display panel, and improving the integrated black effect of the display panel when the color filter substrate 10 forms a display panel. At the same time, since the contrast of the display panel is equal to the ratio of the highest brightness to the lowest brightness on the display panel, the contrast of the display panel can also be improved.

[0043] In some embodiments, the substrate 1 can be a rigid substrate or a flexible substrate. The rigid substrate can be made of glass or quartz, and the flexible substrate can be a polymer material such as polyimide (PI), polycarbonate (PC), polyethylene terephthalate (PET), polyethylene naphthalate (PEN) or graphite.

[0044] In some embodiments, the light shielding layer 2 may be made of a black photoresist material.

[0045] In some embodiments, the material of the planarization layer 4 can be an organic material, an inorganic material, or an organic-inorganic composite material. The organic material can be an acrylic polymer, polyimide, epoxy resin, or acrylic photosensitive resin. The inorganic material can be silicon dioxide, silicon nitride, or aluminum oxide.

[0046] In some embodiments, as Figure 2 or Figure 3 As shown, the auxiliary layer 5 includes a plurality of auxiliary blocks 51. The auxiliary blocks 51 are filled in the openings 2a of the light-shielding layer 2. The openings 2a are oriented in the direction from the substrate 1 toward the light-shielding layer 2. The thickness of the auxiliary blocks 51 is less than or equal to the thickness of the light-shielding layer 2. By directly filling the openings 2a with the auxiliary blocks 51, this embodiment can reduce the step difference while avoiding an additional increase in the overall thickness of the color filter substrate 10.

[0047] In some embodiments, as Figure 2 As shown in FIG, the thickness of the auxiliary block 51 is equal to the thickness of the light shielding layer 2. In other embodiments, as shown in FIG. Figure 3 As shown, the thickness of the auxiliary block 51 is less than the thickness of the light shielding layer 2. In one example, the thickness of the auxiliary block 51 is one-half the thickness of the light shielding layer 2. In another example, the thickness of the auxiliary block 51 is two-thirds the thickness of the light shielding layer 2.

[0048] In some embodiments, as Figure 4 or Figure 5 As shown, the auxiliary layer 5 includes a plurality of auxiliary blocks 51, which are filled in the openings 2a of the light-shielding layer 2. In the direction from the substrate 1 to the light-shielding layer 2, the distance between the surface of the auxiliary block 51 away from the substrate 1 and the substrate 1 is greater than the distance between the surface of the light-shielding layer 2 away from the substrate 1 and the substrate 1. In the direction from the substrate 1 to the light-shielding layer 2, the cross-sectional area of ​​the portion of the auxiliary block 51 that is higher than the surface of the light-shielding layer 2 away from the substrate 1 gradually decreases, and the cross-sectional area is parallel to the surface of the substrate 1 facing the light-shielding layer 2.

[0049] In this embodiment, by gradually reducing the positive projection area of ​​the auxiliary block 51 on the substrate 1, which is higher than the surface of the light-shielding layer 2 on the side away from the substrate 1, the shape of the auxiliary block 51 on the side away from the substrate 1 can be made to have a certain inclination angle with the substrate 1, thereby changing the angle of emission of light, making the direction of light emission as concentrated as possible, and improving the luminous flux.

[0050] In some embodiments, as Figure 4 or Figure 5 As shown, the side surface of the auxiliary block 51 away from the substrate 1 is in the shape of a curved surface or a flat surface. In this embodiment, when the side surface of the auxiliary block 51 away from the substrate 1 is in the shape of a curved surface or a flat surface, the light flux can be improved.

[0051] In some embodiments, as Figure 4 As shown, the shape of the surface of the auxiliary block 51 on the side away from the substrate 1 is an arc surface, for example, it can be a part of a spherical surface or a part of a cylindrical side, so as to form a structure similar to a semi-convex lens. In the propagation direction of the light, the incident angle is θ1 and the exit angle is θ2, and θ2 is smaller than θ1, which can improve the collimation of the light output, so as to improve the light output efficiency of the light transmitted through the color film substrate 10.

[0052] In some embodiments, as Figure 5 As shown, the shape of the side surface of the auxiliary block 51 away from the substrate 1 is a plane, for example, it can be the upper surface of a terrace or the upper surface of a prism. Compared with a plane, the inclined surface can avoid total reflection of light after being refracted by the side of the auxiliary block 51, thereby reducing the amount of light reflected and increasing the luminous flux.

[0053] In some embodiments, as Figure 6 or Figure 7 As shown, in the direction from the substrate 1 to the light shielding layer 2, the thickness of the auxiliary layer 5 is greater than the thickness of the light shielding layer 2; Figure 6As shown, the auxiliary layer 5 includes a first portion 501 and a second portion 502, which are stacked. The surface of the first portion 501 facing away from the substrate 1 is flush with the surface of the light-shielding layer 2 facing away from the substrate 1. The surface of the second portion 502 facing toward the substrate 1 is flush with the surface of the light-shielding layer 2 facing away from the substrate 1. The first portion 501 fills the opening 2a of the light-shielding layer 2, and at least a portion of the second portion 502 covers the surface of the light-shielding layer 2 facing away from the substrate 1. In this embodiment, the thickness of the auxiliary layer 5 can be greater than that of the light-shielding layer 2 to avoid rough gaps at the interface between the auxiliary blocks 51 and the opening 2a when multiple auxiliary blocks 51 are filled in the opening 2a, which makes it difficult to ensure the flatness of the surface formed by the color filter layer 3 and the light-shielding layer 2 facing away from the substrate 1.

[0054] Specifically, this embodiment provides the following two specific implementation methods:

[0055] In a first embodiment, if Figure 6 As shown, the surface of the auxiliary layer 5 facing away from the substrate 1 is a continuous, flat surface. In this embodiment, the auxiliary layer 5 has a zigzag shape on the side closest to the substrate 1, while the side facing away from the substrate 1 continuously and completely covers the openings 2a of the light-shielding layer 2, forming a flat surface. This further improves the flatness of the surface of the auxiliary layer 5 on the side closest to the color filter layer 3, ensuring a higher flatness on the side of the color filter blocks 3a, 3b, and 3c facing away from the substrate 1. This prevents uneven steps formed by the color filter blocks 3a, 3b, and 3c from affecting the rotation direction of the liquid crystal 30. Furthermore, the interlocking of the auxiliary layer 5 and the light-shielding layer 2 prevents horizontal displacement between the film layers, thereby improving the stability of the overall structure.

[0056] In a second embodiment, if Figure 7As shown, the auxiliary layer 5 includes a plurality of auxiliary blocks 51, and the surface of each auxiliary block 51 on the side away from the substrate 1 is flat. Each auxiliary block 51 includes a third part 511 and a fourth part 512 arranged in a stacked manner. The surface of the third part 511 on the side away from the substrate 1 is flush with the surface of the light-shielding layer 2 on the side away from the substrate 1, and the surface of the fourth part 512 on the side facing the substrate 1 is flush with the surface of the light-shielding layer 2 on the side away from the substrate 1. The third part 511 of the auxiliary block 51 is filled in the opening 2a of the light-shielding layer 2, and at least part of the fourth part 512 of the auxiliary block 51 covers the surface of the light-shielding layer 22 away from the substrate 1; in the direction from the substrate 1 to the light-shielding layer 2, the thickness d1 of the part of the auxiliary block 51 covering the light-shielding layer 2 is less than the thickness d2 of the light-shielding layer 22. In this embodiment, the portion of the auxiliary block 51 that fills the opening 2a compensates for the original step created by the opening 2a. Furthermore, the thickness of the portion of the auxiliary block 51 that covers the light-shielding layer 2 creates a new step that is smaller than the original step, similarly reducing the overall step difference of the color filter blocks 3a, 3b, and 3c. Furthermore, because each auxiliary block 51 has a certain step difference on the side of the auxiliary layer 5 facing away from the substrate 1, when the color filter layer 3 is formed on the side of the auxiliary layer 5 facing away from the substrate 1, the side of the color filter layer 3 facing the substrate 1 forms a serrated structure. This prevents horizontal relative displacement between the color filter layer 3 and the auxiliary layer 5, thereby improving the stability of the film layer.

[0057] In some embodiments, the refractive index of the material of the auxiliary layer 5 is greater than or equal to the refractive index of the material of the color filter blocks 3a, 3b, and 3c. In this embodiment, by adjusting the refractive index of the material of the auxiliary layer 5, the deflection angle of the emitted transmitted light is reduced, the direction of the emitted transmitted light is more concentrated, and the luminous flux is increased.

[0058] In some embodiments, the refractive index of the material of the auxiliary layer 5 is in the range of 1.5 to 2. In some embodiments, the refractive index of the material of the auxiliary layer 5 may be 1.5, 1.6, 1.7, 1.8, 1.9 or 2.0.

[0059] In some embodiments, the auxiliary layer 5 has a Vickers hardness greater than or equal to 35 HV. This can improve the elastic recovery rate of the auxiliary layer 5 to enhance the compressive strength of the auxiliary layer 5 and, in turn, the overall compressive strength of the color filter substrate 10. In some embodiments, the Vickers hardness of the auxiliary layer 5 can be 35 HV, 40 HV, 45 HV, or 50 HV.

[0060] In some embodiments, the material of the auxiliary layer 5 includes at least one of acrylic polymer, silicone polymer, polyimide, polyethylene terephthalate, polystyrene, indium tin oxide, silicon dioxide, silicon nitride, and aluminum oxide.

[0061] In some embodiments, when the auxiliary layer 5 has good fluidity, for example, when the material of the auxiliary layer 5 includes a material with good fluidity such as acrylic polymer, silicone polymer, polyimide, etc. Figure 6 As shown, the overall thickness of the auxiliary layer 5 can be made greater than the thickness of the light shielding layer 2 , and the higher fluidity of the material helps the surface of the auxiliary layer 5 away from the substrate 1 to flow into a continuous plane.

[0062] In some embodiments, when the auxiliary layer 5 has poor fluidity but good support, for example, when the material of the auxiliary layer 5 includes polyethylene terephthalate, polystyrene, indium tin oxide, silicon dioxide, silicon nitride, aluminum oxide and other materials with good support, such as Figure 2 As shown, the auxiliary layer 5 can be formed into a plurality of auxiliary blocks 51, each of which is located in an opening 2a. The thickness of the auxiliary block 51 is equal to the thickness of the light-shielding layer 2. This allows the auxiliary layer 5 to compensate for the step difference between the color filter blocks 3a, 3b, and 3c while improving the overall structural stability and supporting force of the color filter substrate 10.

[0063] In some embodiments, the thickness of the auxiliary layer 5 is in the range of 1.15 to 3.0 μm in the direction from the substrate 1 to the light shielding layer 2. In some embodiments, the thickness of the auxiliary layer 5 can be 1.15 μm, 1.5 μm, 1.7 μm, 2.0 μm, 2.5 μm or 3 μm.

[0064] In some embodiments, as Figure 8 Figure 1 shows a schematic layout of the light shielding layer 2 on the substrate 1. The light shielding layer 2 covers the line width w1 of the gate line, the line width w2 of the data line, and the line width w3 of the common voltage line in the array substrate 20, respectively, to prevent the wiring in the array substrate 20 from obstructing light emission.

[0065] In some embodiments, as Figure 9 As shown, on the surface of the substrate 1 facing the light-shielding layer 2, the color filter layer 3 is sequentially arranged along the first direction x with a first color filter block 3a, a second color filter block 3b, and a third color filter block 3c. The orthographic projections of the first color filter block 3a, the second color filter block 3b, and the third color filter block 3c on the substrate 1 all extend in the second direction y, and the first direction x and the second direction y intersect.

[0066] In some embodiments, the first color filter block 3a, the second color filter block 3b, and the third color filter block 3c are all strip-shaped, and the length direction of the first color filter block 3a, the second color filter block 3b, and the third color filter block 3c is the extension direction. The auxiliary layer 5 can form a continuous plane, completely covering the side of the light-shielding layer 2 away from the substrate 1.

[0067] In some embodiments, as Figure 10As shown, on the surface of the substrate 1 facing the light-shielding layer 2, the color filter layer 3 is provided with a first color filter block 3a, a second color filter block 3b and a third color filter block 3c arranged in an array. The first color filter block 3a, the second color filter block 3b and the third color filter block 3c are all designed as an island structure. The auxiliary layer 5 may include a plurality of auxiliary blocks 51 that match the shapes of the color filter blocks 3a, 3b, and 3c, and each auxiliary block 51 is designed as an island structure.

[0068] In some embodiments, the colors of the first color filter block 3a, the second color filter block 3b, and the third color filter block 3c are different.

[0069] In some embodiments, the color of the first color filter block 3a is blue, the color of the second color filter block 3b is green, and the color of the third color filter block 3c is red.

[0070] In some embodiments, as Figure 11 As shown, the color filter substrate 10 further includes a planarization layer 4 located on a side of the color filter layer 3 away from the substrate 1 , for improving the planarity of the color filter substrate 10 .

[0071] This application also provides a method for preparing a color filter substrate 10, such as Figures 12a to 12c or Figures 13a to 13g As shown, the following steps are included:

[0072] Step 100: Figure 12a or Figure 13a As shown, a light shielding layer 2 is formed on a substrate 1, and the light shielding layer 2 is provided with a plurality of openings 2a arranged at intervals;

[0073] Step 200: Figure 12b or Figures 13b to 13f As shown, an auxiliary layer 5 is formed on the light shielding layer 2, and at least a portion of the auxiliary layer 5 is filled in the opening 2a of the light shielding layer 2;

[0074] Step 300: Figure 12c or Figure 13g As shown, a color filter layer 3 is formed on the side of the auxiliary layer 5 away from the substrate 1. The color filter layer 3 includes a plurality of color filter blocks 3a, 3b, and 3c. The orthographic projection of each color filter block 3a / 3b / 3c on the substrate 1 covers the orthographic projection of an opening 2a on the substrate 1. The edge of the orthographic projection of each opening 2a on the substrate 1 is located inside the edge of the orthographic projection of a color filter block 3a / 3b / 3c on the substrate 1.

[0075] In some embodiments, step 200 specifically includes:

[0076] like Figure 12bAs shown, an auxiliary layer film 5a is coated on the surface of the light-shielding layer 2 away from the substrate 1. In the direction from the substrate 1 to the light-shielding layer 2, the thickness of the auxiliary layer film 5a is greater than the thickness of the light-shielding layer 2, and the surface of the auxiliary layer film 5a away from the substrate 1 is a continuous plane.

[0077] In some embodiments, after step 200 , the auxiliary layer film 5 a is further subjected to a baking process for curing to form the auxiliary layer 5 .

[0078] In some embodiments, the baking process includes a pre-bake (HP) and a post-bake (OVEN).

[0079] In some embodiments, the auxiliary layer film 5 a may be made of at least one of acrylic polymers, silicone polymers, polyimide, indium tin oxide, silicon dioxide, silicon nitride, and aluminum oxide.

[0080] In some embodiments, the light shielding layer 2 is provided with a plurality of openings 2a spaced apart from each other, and step 200 specifically includes:

[0081] Step 210: Figure 13b As shown, an auxiliary layer film 5a is deposited on the surface of the light shielding layer 2 away from the substrate 1;

[0082] Step 220: Figures 13c to 13f As shown, the auxiliary layer film 5 a is subjected to a photolithography process to remove the portion of the auxiliary layer film 5 a covering the light shielding layer 2 .

[0083] In this embodiment, a plurality of auxiliary blocks 51 are formed and arranged at intervals, so as to improve the step difference problem of the color filter layer 3 without increasing the overall thickness of the color filter substrate 10 .

[0084] In some embodiments, step 220 specifically includes the following steps:

[0085] Step 221: Figure 13c As shown, a photoresist 6 is coated on the side of the auxiliary layer film 5 a away from the substrate 1 .

[0086] Step 222: Figure 13d As shown, the auxiliary layer 5 is exposed using a mask 7 .

[0087] Step 223: Figure 13e As shown, the photoresist 6 is developed and the auxiliary layer 5 is etched.

[0088] Step 224: Figure 13f As shown, the photoresist 6 covering the surface of the light shielding layer 2 away from the substrate 1 is peeled off.

[0089] It should be noted that a "thin film" refers to a thin layer of a material produced on a substrate using a deposition or coating process. If the thin film does not require patterning during the entire production process, it can also be called a "layer." If the thin film also requires patterning during the entire production process, it is called a "thin film" before patterning and a "layer" after patterning. The "layer" after patterning contains at least one "pattern."

[0090] In some embodiments, a pre-baking process is further included before step 220 and after step 210 to facilitate exposure or development processing.

[0091] In some embodiments, step 220 further includes a post-baking process to improve the overall support of the auxiliary layer 5 .

[0092] In some embodiments, the material of the auxiliary layer film 5a can be at least one of polyethylene terephthalate and polystyrene.

[0093] For further verification, the present application also provides the following table showing the comparison results of experimental data of the color filter substrate 10 under relevant experimental conditions.

[0094] Table 1:

[0095]

[0096] Table 1 shows the data of the step difference in the film layer after the process of forming the flattening layer 4 on the side of the color filter layer 3 away from the substrate 1. Among them, PW and PH are the step differences of the color filter blocks 3a, 3b, 3c in the color filter substrate 10 along the direction from the substrate 1 to the light shielding layer 2. PW is specifically the distance between the highest point and the lowest point of each color filter block 3a, 3b, 3c of the color filter layer 3 on the side away from the substrate 1 along the direction from the substrate 1 to the light shielding layer 2 along the arrangement direction of the color filter blocks 3a, 3b, 3c of different colors; further, the opposite sides of each color filter block 3a, 3b, 3c in the color filter layer 3 are respectively connected to the light shielding layer 2. The color filter blocks 3a, 3b, and 3c overlap, PW-L specifically represents the height of the step formed on one of the two opposing sides, and PW-R specifically represents the height of the step formed on the other of the two opposing sides. PH specifically represents the distance between the highest and lowest points of the surface of each color filter block 3a, 3b, and 3c of the color filter layer 3, along the direction of arrangement of the color filter blocks 3a, 3b, and 3c of the same color, away from the substrate 1, in the direction directed toward the light shielding layer 2. As shown in the table, the contrast ratio of the display panel 100 tested in the related art is 2298. In the present application, by adding an auxiliary layer 5 in the direction corresponding to PW (i.e., the direction in which the color filter blocks 3a, 3b, and 3c of different colors are arranged) for optimization, the contrast ratio can be increased to 2407. By adding an auxiliary layer 5 in both the direction corresponding to PW and the direction corresponding to PH (i.e., the direction in which the color filter blocks 3a, 3b, and 3c of the same color are arranged), the contrast ratio can be increased to greater than or equal to 2527. It can be seen from this that the solution of the present application can further improve the contrast of the display panel 100 .

[0097] In addition, the film step differences after different film layer processes were measured and the corresponding results are shown in the following table.

[0098] Table 2:

[0099]

[0100] As shown in Table 2, in the embodiment provided by the present application, before the auxiliary layer process (that is, after the light-shielding layer process), the step differences PH, PW-L and PW-R formed by the color filter blocks are 1.27 μm, 1.21 μm and 1.21 μm respectively. In the present application, after the auxiliary layer process, the step differences PH, PW-L and PW-R formed by the color filter blocks are 0.86 μm, 0.53 μm and 0.53 μm respectively. After the process of adding the auxiliary layer 5, the step differences are reduced by 0.41 μm, 0.68 μm and 0.68 μm respectively compared with the related art without adding the auxiliary layer process. In the embodiment of the present application, the step differences are further less than 0.2 μm after the planarization layer 4 process, which shows that the planarization optimization effect is significant.

[0101] like Figure 14 As shown, the present application further provides a display panel 100, comprising the color filter substrate 10 as described above, an array substrate 20 arranged in a cell with the color filter substrate 10, and liquid crystals 30 and spacers 40 disposed between the color filter substrate 10 and the array substrate 20. The technical features and beneficial effects of this embodiment are the same as those of the aforementioned embodiment and will not be repeated here.

[0102] The present application also provides a display device, such as Figure 15 As shown, it includes the display panel 100 and the housing 200 as described above. Figure 15 (a) is a top view of the display device in this embodiment, Figure 15 (b) is Figure 15 The technical features and beneficial effects of this embodiment are the same as those of the above embodiment and will not be described in detail here.

[0103] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "plurality" means two or more.

Claims

1. A color film substrate, characterized in that: include: substrate; a light shielding layer, located on one side of the substrate, and provided with a plurality of openings arranged at intervals; an auxiliary layer, located on the same side of the substrate as the light-shielding layer, wherein at least a portion of the auxiliary layer fills the opening of the light-shielding layer; The color filter layer is located on the side of the auxiliary layer away from the substrate and includes a plurality of color filter blocks. The edge of the orthographic projection of each opening on the substrate is located inside the edge of the orthographic projection of a color filter block on the substrate.

2. The color filter substrate according to claim 1, wherein: The auxiliary layer includes a plurality of auxiliary blocks, and the auxiliary blocks are filled in the openings of the light-shielding layer; in the direction from the substrate to the light-shielding layer, the thickness of the auxiliary blocks is less than or equal to the thickness of the light-shielding layer.

3. The color filter substrate according to claim 1, wherein: The auxiliary layer includes a plurality of auxiliary blocks, the auxiliary blocks are filled in the openings of the light shielding layer, and in a direction from the substrate to the light shielding layer, a maximum distance between a surface of the auxiliary block away from the substrate and the substrate is greater than a distance between a surface of the light shielding layer away from the substrate and the substrate; In the direction from the substrate to the light shielding layer, the cross-sectional area of ​​the auxiliary block above the surface of the light shielding layer away from the substrate gradually decreases, and the cross-sectional area is parallel to the surface of the substrate facing the light shielding layer.

4. The color film substrate according to claim 3, characterized in that: The surface of the auxiliary block away from the substrate is in the shape of a curved surface or a flat surface.

5. The color filter substrate according to claim 1, wherein: In the direction from the substrate to the light-shielding layer, the thickness of the auxiliary layer is greater than the thickness of the light-shielding layer; the auxiliary layer includes a first part and a second part which are stacked, a surface of the first part facing away from the substrate is flush with a surface of the light-shielding layer facing away from the substrate, a surface of the second part facing the substrate is flush with a surface of the light-shielding layer facing away from the substrate, the first part fills the opening in the light-shielding layer, and at least a portion of the second part covers the surface of the light-shielding layer away from the substrate.

6. The color filter substrate according to claim 5, characterized in that: The surface of the auxiliary layer away from the substrate is a continuous plane.

7. The color filter substrate according to claim 5, characterized in that: The auxiliary layer includes a plurality of auxiliary blocks, each of the auxiliary blocks having a surface away from the substrate that is flat, and each of the auxiliary blocks including a third portion and a fourth portion that are stacked, a surface of the third portion facing away from the substrate being flush with a surface of the light shielding layer facing away from the substrate, and a surface of the fourth portion facing the substrate being flush with a surface of the light shielding layer facing away from the substrate, the third portion of the auxiliary block filling the opening of the light shielding layer, and at least a portion of the fourth portion of the auxiliary block covering a surface of the light shielding layer facing away from the substrate; In a direction from the substrate to the light-shielding layer, a thickness of a portion of the auxiliary block covering the light-shielding layer is smaller than a thickness of the light-shielding layer.

8. The color film substrate according to claim 1, wherein: The refractive index of the material of the auxiliary layer is greater than or equal to the refractive index of the material of the color filter block.

9. The color filter substrate according to claim 1, wherein: The auxiliary layer has a Vickers hardness greater than or equal to 35 HV.

10. The color filter substrate according to claim 1, wherein: The material of the auxiliary layer includes at least one of acrylic polymer, silicone polymer, polyimide, polyethylene terephthalate, polystyrene, indium tin oxide, silicon dioxide, silicon nitride, and aluminum oxide.

11. A display panel, characterized in that: The invention comprises the color film substrate according to any one of claims 1 to 10.

12. A display device, characterized in that: The display panel comprises the display panel as claimed in claim 11.

Images