A color filter substrate and its preparation method, a display panel and a display device.

Abstract

This application provides a color filter substrate, its fabrication method, a display panel, and a display device. The color filter substrate includes a substrate and a first color filter, a second color filter, and a third color filter, as well as a color filter correction layer, located on one side of the substrate. The first, second, and third color filters are arranged sequentially along a first direction. The third color filter includes a filter portion and a first overlapping portion and a second overlapping portion located on opposite sides of the filter portion. The first overlapping portion overlaps with the first color filter, and the second overlapping portion overlaps with the second color filter. The upper surface of the filter portion is a concave arc-shaped surface. The color filter correction layer is located on the third color filter, and the orthographic projection of the color filter correction layer onto the substrate falls within the orthographic projection of the filter portion onto the substrate. The curvature of the upper surface of the color filter correction layer is less than the curvature of the upper surface of the filter portion. The technical solution disclosed herein can improve the problem of color shift and viewing angle degradation, enhancing the visual experience of the product.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a color filter substrate and its preparation method, a display panel and a display device. Background Technology

[0002] Organic light-emitting diode (OLED) displays have advantages such as small size, light weight, high contrast, fast response speed and low power consumption, and are expected to become the next generation of mobile display terminals.

[0003] In related technologies, OLED display products include a display substrate and a color filter substrate located on the light-emitting side of the display substrate. OLED pixels on the display substrate generate white light, which passes through the color filter substrate to achieve color display. OLED display products suffer from color shift and deteriorated viewing angles, affecting the visual experience. Summary of the Invention

[0004] This application provides a color filter substrate and its preparation method, a display panel, and a display device to solve or alleviate one or more technical problems in the prior art.

[0005] As a first aspect of the present application, the present application provides a color filter substrate, including a substrate and a first color filter, a second color filter and a third color filter located on one side of the substrate. The first color filter, the second color filter and the third color filter are arranged sequentially along a first direction. The third color filter includes a filter portion and a first overlapping portion and a second overlapping portion located on opposite sides of the filter portion. The first overlapping portion overlaps on the first color filter, and the second overlapping portion overlaps on the second color filter. The surface of the filter portion on the side away from the substrate is a concave arc-shaped surface.

[0006] The color filter substrate also includes a color filter correction layer, which is located on the side of the third color filter facing away from the substrate. The orthographic projection of the color filter correction layer on the substrate falls within the orthographic projection of the filter on the substrate. The curvature of the surface of the color filter correction layer facing away from the substrate is less than the curvature of the surface of the filter on the side facing away from the substrate.

[0007] In one embodiment, the surface of the color filter correction layer facing away from the substrate is a flat surface.

[0008] In one embodiment, the material of the color filter correction layer is the same as the material of the third color filter.

[0009] In one embodiment, the difference between the refractive index of the color filter correction layer and the refractive index of the third color filter is less than 15% of the refractive index of the third color filter.

[0010] In one embodiment, the maximum distance between the surface of the color filter correction layer facing away from the substrate and the substrate is a first distance, and the maximum distance between the surface of the first overlap or the second overlap facing away from the substrate and the substrate is a second distance, wherein the first distance is less than or equal to the second distance; and / or

[0011] The minimum distance between the surface of the color filter correction layer facing away from the substrate and the substrate is the third distance; the minimum distance between the surface of the first color filter or the second color filter facing away from the substrate and the substrate is the fourth distance; the third distance is greater than or equal to the fourth distance; and / or,

[0012] The minimum distance between the surface of the filter unit facing away from the substrate and the substrate is the fifth distance, and the minimum distance between the surface of the first color film or the second color film facing away from the substrate and the substrate is the fourth distance. The fifth distance is less than the fourth distance.

[0013] In one embodiment, the curvature of the surface of the filter portion facing away from the substrate is greater than the curvature of the surface of the first color film facing away from the substrate, or the curvature of the surface of the filter portion facing away from the substrate is greater than the curvature of the surface of the second color film facing away from the substrate.

[0014] In one embodiment, the color filter substrate is used in a display panel, and the resolution of the display panel is greater than or equal to 3000 PPI.

[0015] In one embodiment, the third color film is a red color film.

[0016] As a second aspect of the present application, the present application provides a display panel, including a display substrate and a color filter substrate according to any embodiment of the first aspect.

[0017] In one embodiment, the display substrate includes a second substrate and a pixel definition layer located on the second substrate facing the color filter substrate. The pixel definition layer is provided with a plurality of openings, and a plurality of color filters in the color filter substrate correspond one-to-one with the plurality of openings. The orthographic projection of the color filter correction layer on the second substrate includes the orthographic projection of the corresponding opening on the second substrate.

[0018] As a third aspect of the embodiments of this application, the embodiments of this application provide a method for preparing a color filter substrate, comprising:

[0019] A first color film and a second color film are formed on one side of the substrate.

[0020] A third color film is formed on the side of the substrate facing the first color film and the second color film. The first color film, the second color film and the third color film are arranged sequentially along the first direction. The third color film includes a filter portion and a first overlapping portion and a second overlapping portion located on opposite sides of the filter portion. The first overlapping portion overlaps on the first color film, and the second overlapping portion overlaps on the second color film. The surface of the filter portion on the side away from the substrate is a concave arc-shaped surface.

[0021] A color correction layer is formed on the side of the third color filter facing away from the substrate. The orthographic projection of the color correction layer on the substrate falls within the orthographic projection of the filter on the substrate. The curvature of the surface of the color correction layer facing away from the substrate is less than the curvature of the surface of the filter facing away from the substrate.

[0022] As a fourth aspect of the present application, the present application provides a display device including a display panel according to any embodiment of the second aspect.

[0023] The embodiments of this application, by adopting the above technical solution, can achieve the following beneficial effects: it can reduce the negative lens effect of the display product, improve the problem of color shift and viewing angle deterioration, improve the visual experience of the product, and increase customer satisfaction.

[0024] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0025] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0026] Figure 1 The manufacturing process of the color filter substrate according to the relevant technology is shown.

[0027] Figure 2 This is a structural diagram of an OELD display panel based on related technologies.

[0028] Figure 3 This is a schematic diagram of the light effect of the third color film.

[0029] Figure 4 This is a schematic diagram showing the viewing angle test results of an OLED display product.

[0030] Figure 5 This is a schematic diagram of a color filter substrate in one embodiment of the present disclosure.

[0031] Figure 6 This is a schematic diagram of a display panel according to one embodiment of the present disclosure.

[0032] Figure 7 This is a schematic flowchart of the method for preparing a color filter substrate according to an embodiment of the present disclosure.

[0033] Figure 8 This is a schematic diagram of the structure after the modified color filter layer is formed in the fabrication method of the color filter substrate according to an embodiment of the present disclosure.

[0034] Figure 9 This is a schematic diagram illustrating the exposure of the modified color resist layer in the method for preparing the color filter substrate according to an embodiment of this disclosure.

[0035] Explanation of reference numerals in the attached figures:

[0036] 10. Color filter substrate; 11. Color filter correction layer; 12. First color filter; 13. Second color filter; 14. Third color filter; 15. Encapsulation film layer; 16. Correction color resist layer; 17. First photomask;

[0037] 100, substrate; 200, first color resist layer; 300, second color resist layer; 400, third color resist layer;

[0038] 141. Filter section; 142. First overlapping section; 143. Second overlapping section;

[0039] 20. Display substrate; 21. Pixel definition layer; 22. Opening. Detailed Implementation

[0040] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this disclosure. Therefore, the drawings and description are to be considered exemplary in nature and not restrictive.

[0041] In related technologies, OLED display products include a display substrate and a color filter substrate located on the light-emitting side of the display substrate. A thin-film encapsulation layer (TFE) is disposed above the OLED pixels on the display substrate to encapsulate the OLED pixels, preventing the materials in the OLED pixels and the cathode material (typically magnesium and / or silver) from being oxidized by water and oxygen, thus isolating the OLED pixels from water and oxygen corrosion. The OLED pixels generate white light. When this white light passes through the color filter on the color filter substrate, the color filter can absorb specific wavelengths of light to allow monochromatic light (red, blue, and green) to pass through, achieving color display.

[0042] OLED display substrates use monocrystalline silicon integrated circuits as the backplane, which drive the pixels and control the display. Furthermore, the backplane integrates image processing functions such as temperature compensation, brightness control, and gamma correction.

[0043] In the color filter substrate, color filters of various colors are formed in a step-by-step process. Figure 1 A flowchart illustrating the manufacturing process of a color filter substrate according to relevant technologies is shown.

[0044] like Figure 1 As shown, the color filter substrate includes a substrate 100 and a first color filter 12, a second color filter 13 and a third color filter 14 located on one side of the substrate 100. The first color filter 12, the second color filter 13 and the third color filter 14 are arranged sequentially on the substrate 100 along a first direction.

[0045] The specific manufacturing process of the color filter substrate is as follows: Figure 1 As shown, a first color resist layer 200 is coated on one side of a substrate 100. The first color resist layer 200 is patterned through exposure and development processes to form a first color film 12. A second color resist layer 300 is coated on the substrate 100 where the first color film 12 is formed. The second color resist layer 300 is patterned through exposure and development processes to form a second color film 13. A third color resist layer 400 is coated on the substrate 100 where the second color film 13 is formed. The third color resist layer 400 is patterned through exposure and development processes to form a third color film 14. Exemplarily, the first color film 12, the second color film 13, and the third color film 14 can be, in sequence, a blue color film (B), a green color film (G), and a red color film (R). Exemplarily, the material of the blue color film can be BQP183, the material of the green color film can be G2D041-CH, and the material of the red color film can be SRS-B073A.

[0046] In other embodiments, the first color film 12, the second color film 13, and the third color film 14 are manufactured in steps, and the first color film 12, the second color film 13, and the third color film 14 can be R, G, B or B, R, G or R, G, B, etc.

[0047] During the color filter fabrication process, due to the presence of the previous color filter, the edges of the next layer of color filter overlap, forming a joint. For example, as... Figure 2As shown, the first step is to create a first color film 12; the second step is to create a second color film 13, one side of which overlaps with the first color film 12 to form a horn-shaped overlap; the third step is to create a third color film 14, both sides of which overlap with the first color film 12 and the second color film 13 to form horn-shaped overlaps. For example, in Figure 2 In the third color filter 14, there are a filter portion 141 located in the middle and a first overlapping portion 142 and a second overlapping portion 143 located on both sides of the filter portion 141. Due to the presence of the first overlapping portion 142 and the second overlapping portion 143, a pitted shape appears on the upper surface of the third color filter 14.

[0048] Figure 3 This is a schematic diagram illustrating the light effect of the third color filter. (Example:) Figure 3 As shown, since the refractive index of the third color filter 14 is different from that of the encapsulation film layer (e.g., organic material parylene) located thereon, for example, the refractive index of the encapsulation film layer is 1.55 and the refractive index of the third color filter 14 is 1.83, when the light emitted by the OLED pixel passes through the third color filter 14 and enters the encapsulation film layer, a negative lens effect will be formed.

[0049] Figure 4 This is a schematic diagram of viewing angle test results for an OLED display product. For example, the third color filter 14 can be a red color filter. In the viewing angle test results, the negative lensing effect causes a double-peak phenomenon in the brightness attenuation curve of R, as shown below. Figure 4 As shown, the bimodal phenomenon causes a deterioration in the color shift of R, thus affecting the visual experience of the product.

[0050] In related technologies, viewing angles include color shift viewing angles and luminance viewing angles. Luminance viewing angles include a 0° positive viewing angle (W luminance) and a wide viewing angle (W luminance), and can be determined by calculating luminance attenuation. Color shift viewing angles include a 0° viewing angle (W chromaticity coordinates) and a wide viewing angle (W chromaticity coordinates), and can be determined by calculating the color deviation value (DUV), which must be less than 0.025.

[0051] According to the color mixing formula in colorimetry, the chromaticity of a W image is mainly determined by the brightness of R, G, and B themselves and the ratio of their brightness. The main factor affecting the viewing angle of color shift is the brightness ratio of the three primary colors R, G, and B. If red brightness is dominant, the image will appear reddish at a wide viewing angle; if blue brightness is dominant, the image will appear bluish at a wide viewing angle.

[0052] Figure 2In the embodiment, a pit shape appeared on the light-emitting side of the red color film 14. The brightness of the R angle increased with the increase of the viewing angle from 0° to the wide viewing angle. As a result, among the brightness of the three primary colors R, G and B, the brightness of R is dominant. Therefore, the white picture at the wide viewing angle is seriously reddish, which greatly affects the visual experience of the product and reduces customer satisfaction.

[0053] To address the color shift viewing angle problem, this disclosure provides a color filter substrate 10. The technical solution of this disclosure is described in detail below through embodiments.

[0054] Figure 5 A schematic diagram of the structure of a color filter substrate according to an embodiment of the present disclosure is shown. In one embodiment, such as... Figure 5 As shown, the color filter substrate 10 includes a substrate 100 and a first color filter 12, a second color filter 13 and a third color filter 14 located on one side of the substrate 100.

[0055] The substrate 100 of the color filter substrate 10 supports the various film layers of the color filter substrate 10. Since the color filter substrate 10 is located entirely on the light-emitting side, in order to ensure the light extraction efficiency of the color filter substrate 10, the material of the substrate 100 needs to have good light transmittance to avoid significant light loss when passing through the substrate 100, thereby improving the light extraction efficiency of the color filter substrate 10. For example, the material of the substrate 100 can be glass, polyimide (PI), or other types of materials. Its specific material and size can be adjusted according to actual design requirements and are not limited here.

[0056] The first color filter 12, the second color filter 13, and the third color filter 14 are arranged sequentially along a first direction X. For example, the first direction is... Figure 5 In the horizontal direction of the substrate. During the fabrication of the color filter, a first color filter 12, a second color filter 13, and a third color filter 14 are sequentially fabricated on one side of the substrate. The first color filter 12, the second color filter 13, and the third color filter 14 can be formed on the substrate through processes such as coating, exposure, and development.

[0057] like Figure 5As shown, the third color filter 14 includes a filter portion 141 and a first overlapping portion 142 and a second overlapping portion 143 located on opposite sides of the filter portion 141. The filter portion 141, the first overlapping portion 142, and the second overlapping portion 143 are integrally formed. The first overlapping portion 142 overlaps the first color filter 12, and the second overlapping portion 143 overlaps the second color filter 13. The surface of the filter portion 141 facing away from the substrate is a concave arc-shaped surface A. Since the first color filter 12 and the second color filter 13 are formed before the third color filter 13, when the third color filter 14 is formed, due to the properties of the materials and the characteristics of the manufacturing process, the third color filter 14 overlaps the side of the first color filter 12 and the second color filter 13 facing away from the substrate, thereby forming the first overlapping portion 142 and the second overlapping portion 143 located on opposite sides of the filter portion 141. On the one hand, the first overlapping portion 142 and the second overlapping portion 143 overlap the surfaces of the first color film 12 and the second color film 13 away from the substrate. On the other hand, the surface of the filter portion 141 away from the substrate will be recessed towards the side closer to the substrate, thereby forming an arc-shaped groove with a large curvature on the surface of the third color film 14 away from the substrate.

[0058] Reference Figure 5 The color filter substrate 10 also includes a color filter correction layer 11, which is located on the side of the third color filter 14 that is away from the substrate. The orthographic projection of the color filter correction layer 11 onto the substrate falls within the orthographic projection of the filter portion 141 onto the substrate, and the curvature of the surface of the color filter correction layer 11 on the side away from the substrate is less than the curvature of the surface of the filter portion 141 on the side away from the substrate.

[0059] In related technologies, such as Figure 2 and Figure 3 As shown, the upper surface of the third color filter 14 has a large concave curvature. When the encapsulation film layer 15 is formed on the third color filter 14, due to the difference in refractive index between the encapsulation film layer 15 and the third color filter 14, a negative lens effect is formed when light passes through the third color filter 14 and enters the encapsulation film layer 15.

[0060] In this embodiment of the color filter substrate 10, a color filter correction layer 11 is provided on the surface of the third color filter 14 facing away from the substrate. The color filter correction layer 11 can fill the concave arc-shaped surface of the filter portion 141. The surface curvature of the color filter correction layer 11 facing away from the substrate is smaller than that of the filter portion 141 facing away from the substrate. When an encapsulation film layer is formed on the upper side of the color filter correction layer 11, since the surface curvature of the color filter correction layer 11 facing away from the substrate is smaller than that of the filter portion 141, that is, the concave arc of the upper surface of the color filter correction layer 11 is smaller than that of the upper surface of the filter portion 141, the negative lens effect is greatly reduced when light enters the encapsulation film layer through the color filter correction layer 11 compared to when light enters the encapsulation film layer through the third color filter 14. This improves the problem of color shift and viewing angle deterioration, enhances the visual experience of the product, and increases customer satisfaction.

[0061] For example, the color filter correction layer 11 is located on the concave arcuate surface of the filter portion 141 on the side facing away from the substrate. The color filter correction layer 11 is filled along the side facing away from the substrate on the concave arcuate surface by filling. The material of the color filter correction layer 11 can be selected from materials with the same optical properties as the third color filter or similar optical properties such as refractive index. The shape of the color filter correction layer 11 is not limited here, and the color filter correction layer 11 is adapted to the shape of the third color filter 14.

[0062] In one embodiment, such as Figure 5 As shown, the two sides of the color filter correction layer 11 along the first direction X cannot extend beyond the two sides of the filter portion 141 along the substrate direction. In other words, the color filter correction layer 11 cannot contact the first overlapping portion 142 and the second overlapping portion 143 on both sides. By limiting the color filter correction layer 11 within this range, it is possible to avoid the formation of new overlapping portions between the two sides of the color filter correction layer 11 and the first overlapping portion 142 and the second overlapping portion 143 during the formation of the color filter correction layer 11, thereby affecting the effect of the color filter correction layer 11.

[0063] For example, a color filter correction layer 11 can be formed on the concave arc-shaped surface A using processes such as coating, exposure, and development. The color filter correction layer 11 is used to improve defects in the third color filter 14. Therefore, when forming the color filter correction layer 11, it is necessary to set appropriate exposure areas and exposure parameters to ensure that the color filter correction layer 11 can meet the requirements for the above-mentioned projection size and curvature.

[0064] In one embodiment, the difference between the refractive index of the color filter correction layer 11 and the refractive index of the third color filter 14 is less than 15% of the refractive index of the third color filter 14. For example, the difference between the refractive index of the color filter correction layer 11 and the refractive index of the third color filter 14 is less than 10% of the refractive index of the third color filter 14. Due to factors such as manufacturing process, the refractive indices of the color filter correction layer 11 and the third color filter 14 may differ. The difference between the refractive indices of the color filter correction layer 11 and the third color filter 14 is less than 15% of the refractive index of the third color filter 14. Within this range, the overall light transmission effect of the color filter correction layer 11 and the third color filter 14 is better, which can minimize the negative lens effect between the third color filter 14 and the color filter correction layer 11 and improve the color shift viewing angle. For example, the refractive index of the color filter correction layer 11 may be less than, equal to or greater than the refractive index of the third color filter 14, but the difference between the refractive index of the color filter correction layer 11 and the refractive index of the third color filter 14 must be less than 15% of the refractive index of the third color filter 14.

[0065] In one embodiment, the material of the color filter correction layer 11 is the same as that of the third color filter 14. This arrangement allows the refractive index of the color filter correction layer 11 to be the same as that of the third color filter 14. This reduces the variety of materials used, and the identical optical properties of the color filter correction layer 11 and the third color filter 14 result in a better combined effect, further reducing the negative lens effect and improving the color shift viewing angle.

[0066] Reference Figure 5 In one embodiment, the surface of the color filter correction layer 11 facing away from the substrate is a flat surface. "Flat surface" here can be understood as a plane or a curved surface with a small curvature on the surface of the color filter correction layer 11 facing away from the substrate. When the surface of the color filter correction layer 11 facing away from the substrate is a flat surface, the light emitted from the color filter correction layer 11 can be incident perpendicularly on the encapsulation film layer, avoiding the negative lens effect.

[0067] Reference Figure 5 In some embodiments, the maximum distance between the surface of the color filter correction layer 11 facing away from the substrate and the substrate is a first distance d1, and the maximum distance between the surface of the first overlapping portion 142 or the second overlapping portion 143 facing away from the substrate and the substrate is a second distance d2. The first distance d1 is less than or equal to the second distance d2. That is, the upper surface of the color filter correction layer 11 cannot be higher than the upper surfaces of the first overlapping portions 142 or the second overlapping portions 143 on both sides. This not only prevents the formation of new concave areas between the color filter correction layer 11 and the first overlapping portions 142 and the second overlapping portions 143 on both sides, but also avoids the color filter correction layer 11 from affecting subsequent film layers.

[0068] Reference Figure 5 In one embodiment, the minimum distance between the surface of the color filter correction layer 11 facing away from the substrate and the substrate is a third distance d3, and the minimum distance between the surface of the first color filter 12 or the second color filter 13 facing away from the substrate and the substrate is a fourth distance d4. The third distance d3 is greater than or equal to the fourth distance d4. The surface of the color filter correction layer 11 facing away from the substrate is an arc-shaped surface, and the minimum distance between the surface of the color filter correction layer 11 facing away from the substrate and the substrate is the distance between the bottommost point of the arc-shaped surface of the color filter correction layer 11 facing away from the substrate and the substrate. Similarly, the surface of the first color filter 12 or the second color filter 13 facing away from the substrate is also an arc-shaped surface, and the fourth distance d4 is the distance between the bottom arc-shaped surface of the first color filter 12 or the second color filter 13 and the substrate. It can be understood that when the surface of the color filter correction layer 11 facing away from the substrate is a flat surface, the third distance d3 is the same as the first distance d1.

[0069] Reference Figure 5 The minimum distance between the surface of the filter section 141 facing away from the substrate and the substrate is a fifth distance d5, and the minimum distance between the surface of the first color film 12 or the second color film 13 facing away from the substrate and the substrate is a fourth distance d4. The fifth distance d5 is less than the fourth distance d4. That is, the lowest point of the upper surface of the filter section 141 is lower than the lowest point of the upper surface of the first color film 12 or the second color film 13. Figure 7 As shown.

[0070] It should be noted that, due to the influence of the color filter material and manufacturing process, both the surface of the first color filter 12 and the second color filter 13 facing away from the substrate will have a depression. During production, if the first color filter 12 is manufactured first, one side of the second color filter 13 will overlap the first color filter 12, resulting in a depression on the surface of the second color filter 13 facing away from the substrate, and the curvature of the depression in the second color filter 13 is greater than that in the first color filter 12. Similarly, it can be understood that if the second color filter 13 is manufactured first, one side of the first color filter 12 will overlap the second color filter 13, resulting in a greater curvature of the depression on the surface of the first color filter 12 facing away from the substrate than that in the second color filter 13. In some embodiments, the curvature of the surface of the filter portion 141 facing away from the substrate is greater than the curvature of the surface of the first color filter 12 facing away from the substrate. Alternatively, the curvature of the surface of the filter section 141 facing away from the substrate is greater than the curvature of the surface of the second color film 13 facing away from the substrate.

[0071] In one embodiment, the color filter substrate 10 is used in a display panel with a resolution greater than or equal to 3000 PPI. Understandably, the higher the resolution of the display panel, the easier it is for the color filter substrate 10 to form a recessed shape due to the smaller sub-pixel size, resulting in a larger curvature of the recessed area on the upper surface of the filter portion 141. However, when the resolution of the display panel is lower than 3000 PPI, the larger sub-pixel size leads to larger sizes for the first color filter 12, the second color filter 13, and the third color filter 14, resulting in a relatively flatter filter portion 141 with a smaller recessed curvature.

[0072] In one embodiment, the third color film 14 is a red color film. This improves the viewing angle of red color shift and prevents the displayed product from appearing too red at large viewing angles. In other embodiments, the third color film can be a blue color film, thereby preventing the displayed product from appearing too blue at large viewing angles. The color of the third color film can be set as needed to improve the viewing angle of color shift and prevent color shift at large viewing angles.

[0073] Another embodiment of this disclosure provides a display panel, including a display substrate 20 and a color filter substrate 10 according to any embodiment of this disclosure. The color filter substrate 10 is located on the light-emitting side of the display substrate 20. Exemplarily, the display substrate can be an OLED display substrate. The display panel using the color filter substrate 10 in the embodiments of this disclosure can improve the visual experience.

[0074] Reference Figure 6 In some embodiments, the display substrate 20 includes a second substrate (not shown) and an anode layer located on the second substrate facing the color filter substrate 10. The anode layer includes a plurality of anodes 25. The display substrate 20 also includes a pixel definition layer 21 located on the side of the anode layer opposite to the second substrate, and the pixel definition layer 21 is provided with a plurality of openings 22. OLED pixels (not shown) are located within the openings 22. The display substrate 20 may also include a cathode layer (not shown) located on the side of the OLED pixels opposite to the second substrate, and the OLED pixels emit light under the driving of the anode and cathode. The plurality of color filters in the color filter substrate 10 correspond one-to-one with the plurality of openings 22, and the orthographic projection of the color filter correction layer 11 on the second substrate includes the orthographic projection of the corresponding opening 22 on the second substrate. Exemplarily, the orthographic projection of the color filter correction layer 11 on the second substrate coincides with the orthographic projection of the corresponding opening 22 on the second substrate. It is understandable that the light emitted by the OLED pixel will pass through the color filter correction layer 11. Setting the orthographic projection of the color filter correction layer 11 on the second substrate to include the corresponding opening 22 within the orthographic projection of the second substrate can ensure that as much light emitted by the OLED pixel as possible passes through the color filter correction layer 11, thereby maximizing the improvement of the color shift viewing angle and avoiding a deterioration in the color shift viewing angle.

[0075] Figure 7This is a block diagram illustrating a method for fabricating a color filter substrate according to one embodiment of the present disclosure. Another embodiment of the present disclosure provides a method for fabricating a color filter substrate, the method comprising steps S10 to S30.

[0076] In step S10, a first color film 12 and a second color film 13 are formed on one side of the substrate.

[0077] In step S20, a third color film 14 is formed on the side of the substrate facing the first color film 12 and the second color film 13. The first color film 12, the second color film 13 and the third color film 14 are arranged sequentially along the first direction. The third color film 14 includes a filter portion 141 and a first overlapping portion 142 and a second overlapping portion 143 located on opposite sides of the filter portion 141. The first overlapping portion 141 overlaps the first color film 12 and the second overlapping portion 143 overlaps the second color film 13. The surface of the filter portion 141 facing away from the substrate is a concave arc-shaped surface A.

[0078] In step S30, a color correction layer 11 is formed on the side of the third color filter 14 away from the substrate. The orthographic projection of the color correction layer 11 on the substrate falls within the orthographic projection of the filter portion 141 on the substrate. The curvature of the surface of the color correction layer 11 away from the substrate is less than the curvature of the surface of the filter portion 141 away from the substrate.

[0079] The color filter substrate 10 prepared by this method can avoid the negative lens effect caused by the concave arc surface of the filter portion 141 by forming a color filter correction layer 11 on the side of the third color filter 14 away from the substrate, effectively improving the color shift viewing angle of the color filter substrate 10 and enhancing the visual experience.

[0080] The technical solution of this disclosure is further illustrated below through the fabrication process of a color filter substrate in one embodiment. It is understood that the term "patterning" as used herein includes processes such as photoresist coating, mask exposure, development, etching, and photoresist stripping when the patterning material is inorganic or metallic; and processes such as mask exposure and development when the patterning material is organic. Evaporation, deposition, coating, and plating are all mature fabrication processes in related technologies.

[0081] In step S10, a first color film 12 and a second color film 13 are formed on one side of the substrate. Exemplarily, a first color resist layer can be coated on one side of the substrate, and the first color resist layer can be patterned through exposure and development processes to form the first color film 12; a second color resist layer is coated on the substrate on which the first color film 12 is formed, and the second color resist layer can be patterned through exposure and development processes to form the second color film 13, as shown below. Figure 8As shown. The side of the second color film 13 closest to the first color film 12 overlaps the first color film 12.

[0082] In step S20, a third color film 14 is formed on the side of the substrate facing the first color film 12 and the second color film 13. Exemplarily, a third color resist layer is coated on the substrate on which the first color film 12 and the second color film 13 are formed. The third color resist layer is patterned through exposure and development processes to form the third color film 14. Figure 8 As shown.

[0083] In step S30, a color filter correction layer 11 is formed on the side of the third color filter 14 facing away from the substrate. Exemplarily, a correction color resist layer 16 is coated on a substrate on which the first color filter 12, the second color filter 13, and the third color filter 14 are formed, such as... Figure 8 As shown, the first photomask 17 is used to expose and develop the corrected color resist layer 16, as follows: Figure 9 As shown, a color filter correction layer 11 is formed. Exemplarily, the exposure area of ​​the correction color resist layer 16 is between the first overlap portion 142 and the second overlap portion 143, and the exposure area includes the area where the opening 22 is located. Thus, the orthographic projection of the formed color filter correction layer 11 onto the substrate falls within the orthographic projection of the filter portion 141 onto the substrate, and the orthographic projection of the color filter correction layer 11 onto the second substrate of the display substrate includes the orthographic projection of the corresponding opening of the display substrate onto the second substrate.

[0084] When forming the color filter correction layer 11 using an exposure process, it is necessary to set the corresponding exposure area and exposure parameters to ensure that the color filter correction layer 11 can meet the requirements of the projection size and curvature of the color filter correction layer in the embodiments of this disclosure.

[0085] Another embodiment of this disclosure provides a display device, including the display panel described in any embodiment of this disclosure. The display device provided in the embodiments of this disclosure can be, for example, any product or component with display and touch functions, such as a smartphone, wearable smartwatch, smart glasses, tablet computer, television, monitor, laptop computer, digital photo frame, navigator, in-vehicle display, e-book, biometric device such as smart skin device, soft robot, and biomedical device.

[0086] According to the embodiments of this application, by adopting the above-described display panel, the negative lens effect caused by the concave arc surface of the third color filter 14 can be avoided, the color shift viewing angle of the color filter substrate 10 can be improved, customer satisfaction can be increased, the display effect of the display device can be guaranteed, the visual experience of the product can be avoided, and the overall performance of the display device can be improved.

[0087] Other configurations of the color filter substrate, display panel, and display device in the above embodiments can be derived from various technical solutions now and in the future known to those skilled in the art, and will not be described in detail here.

[0088] In the description of this specification, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0089] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0090] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0091] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0092] The foregoing disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0093] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A color filter substrate, characterized by, The device includes a substrate and a first color filter, a second color filter, and a third color filter located on one side of the substrate. The first color filter, the second color filter, and the third color filter are arranged sequentially along a first direction. The third color filter includes a filter portion and a first overlapping portion and a second overlapping portion located on opposite sides of the filter portion. The first overlapping portion overlaps on the first color filter, and the second overlapping portion overlaps on the second color filter. The surface of the filter portion on the side away from the substrate is a concave arc-shaped surface. The color filter substrate further includes a color filter correction layer, which is located on the side of the third color filter facing away from the substrate. The orthographic projection of the color filter correction layer on the substrate falls within the orthographic projection of the filter portion on the substrate. The curvature of the surface of the color filter correction layer facing away from the substrate is less than the curvature of the surface of the filter portion facing away from the substrate.

2. The color filter substrate according to claim 1, characterized in that, The surface of the color filter correction layer facing away from the substrate is a flat surface.

3. The color filter substrate according to claim 1, characterized in that, The material of the color filter correction layer is the same as the material of the third color filter.

4. The color filter substrate according to claim 1, characterized in that, The difference between the refractive index of the color filter correction layer and the refractive index of the third color filter is less than 15% of the refractive index of the third color filter.

5. The color filter substrate according to claim 1, characterized in that, The maximum distance between the surface of the color filter correction layer facing away from the substrate and the substrate is a first distance; the maximum distance between the surface of the first overlapping portion or the second overlapping portion facing away from the substrate and the substrate is a second distance; the first distance is less than or equal to the second distance; and / or The minimum distance between the surface of the color filter correction layer facing away from the substrate and the substrate is a third distance; the minimum distance between the surface of the first color filter or the second color filter facing away from the substrate and the substrate is a fourth distance; the third distance is greater than or equal to the fourth distance; and / or, The minimum distance between the surface of the filter portion facing away from the substrate and the substrate is the fifth distance, and the minimum distance between the surface of the first color film or the second color film facing away from the substrate and the substrate is the fourth distance. The fifth distance is less than the fourth distance.

6. The color filter substrate according to claim 1, characterized in that, The curvature of the surface of the filter portion facing away from the substrate is greater than the curvature of the surface of the first color film facing away from the substrate, or the curvature of the surface of the filter portion facing away from the substrate is greater than the curvature of the surface of the second color film facing away from the substrate.

7. The color filter substrate according to claim 1, characterized in that, The color filter substrate is used in a display panel, and the resolution of the display panel is greater than or equal to 3000 PPI.

8. The color filter substrate according to claim 1, characterized in that, The third color film is a red color film.

9. A display panel, characterized in that, It includes a display substrate and a color filter substrate as described in any one of claims 1-8.

10. The display panel according to claim 9, characterized in that, The display substrate includes a second substrate and a pixel definition layer located on the second substrate facing the color filter substrate. The pixel definition layer is provided with a plurality of openings. A plurality of color filters in the color filter substrate correspond one-to-one with the plurality of openings. The orthographic projection of the color filter correction layer on the second substrate includes the orthographic projection of the corresponding opening on the second substrate.

11. A method for preparing a color filter substrate, characterized in that, include: A first color film and a second color film are formed on one side of the substrate; A third color film is formed on the side of the substrate facing the first color film and the second color film. The first color film, the second color film and the third color film are arranged sequentially along a first direction. The third color film includes a filter portion and a first overlapping portion and a second overlapping portion located on opposite sides of the filter portion. The first overlapping portion overlaps on the first color film, and the second overlapping portion overlaps on the second color film. The surface of the filter portion on the side away from the substrate is a concave arc-shaped surface. A color filter correction layer is formed on the side of the third color filter facing away from the substrate. The orthographic projection of the color filter correction layer on the substrate falls within the orthographic projection of the filter portion on the substrate. The curvature of the surface of the color filter correction layer facing away from the substrate is less than the curvature of the surface of the filter portion facing away from the substrate.

12. A display device, characterized in that, Includes the display panel as described in claim 9 or 10.

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