Display substrate and manufacturing method therefor, and display device

Abstract

Provided in the present application are a display substrate and a manufacturing method therefor, and a display device. The display substrate comprises a base substrate, a light-emitting layer located on the base substrate, an encapsulation layer, a color filter layer and a light shielding layer. The light-emitting layer comprises a plurality of light-emitting structures arranged at intervals. The encapsulation layer is located on a side of the light-emitting layer away from the base substrate. The color filter layer is located on a side of the encapsulation layer away from the base substrate, and the color filter layer comprises a plurality of color filter portions, each color filter portion comprising a first color filter portion and a non-first color filter portion of a different color than the first color filter portion. The thickness of the first color filter portion is smaller than that of the non-first color filter portion. The light shielding layer is provided with a plurality of openings, and an orthographic projection of one opening on the base substrate falls within an orthographic projection of one color filter portion on the base substrate. The light shielding layer is located on a side of the first color filter portion away from the base substrate, and the light shielding layer is substantially flush with a surface of the base substrate.

Description

Display substrate and manufacturing method thereof, and display device Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display substrate and a preparation method thereof, and a display device. Background Art

[0002] OLED (Organic Light-Emitting Diode) has the advantages of self-luminescence, high efficiency, bright colors, light weight, power saving and wide operating temperature range. It has been gradually applied to large-area display, lighting and automotive display.

[0003] Summary of the Invention

[0004] The present application provides a display substrate, a method for preparing the same, and a display device.

[0005] According to a first aspect of an embodiment of the present application, a display substrate is provided. The display substrate includes:

[0006] substrate;

[0007] a light-emitting layer located on the substrate, the light-emitting layer comprising a plurality of light-emitting structures arranged at intervals;

[0008] an encapsulation layer, located on a side of the light-emitting layer away from the substrate;

[0009] a color filter layer located on a side of the encapsulation layer away from the substrate, the color filter layer comprising a plurality of color filter portions, the color filter portions comprising a first color filter portion and a non-first color filter portion having a color different from that of the first color filter portion, the first color filter portion having a thickness smaller than that of the non-first color filter portion;

[0010] The light-shielding layer is provided with a plurality of openings, wherein the orthographic projection of one of the openings on the substrate falls within the orthographic projection of one of the color filter portions on the substrate; the light-shielding layer is located on a side of the first color filter portion away from the substrate, and the surface of the light-shielding layer facing the substrate is substantially flush.

[0011] In one embodiment, the display substrate further includes a defining layer located on a side of the encapsulation layer away from the substrate, the defining layer being provided with a plurality of openings, the color filter portion being at least partially located within the openings; the first color filter portion being entirely located within the openings, and the surface of the first color filter portion away from the substrate being flush with the surface of the defining layer away from the substrate; a partial area of ​​the surface of the light-shielding layer facing the substrate is in contact with the first color filter portion, and another partial area is in contact with the defining layer; the portion other than the first color filter portion is located on a side of the light-shielding layer away from the substrate.

[0012] In one embodiment, the opening where the first color filter portion is located includes a first opening portion and a second opening portion located on a side of the first opening portion away from the substrate, the second opening portion includes a bottom surface located outside the first opening portion and connected to the side surface of the first opening portion, and a side surface formed by the outer edge of the bottom surface extending outward in a direction away from the substrate.

[0013] In one embodiment, the display substrate further comprises a defining layer located on a side of the encapsulation layer away from the substrate, the defining layer being provided with a plurality of openings, and the color filter portion being at least partially located within the openings;

[0014] The display substrate also includes a plurality of raised portions, each of which is located between the first color filter portion and the encapsulation layer. The orthographic projection of the bottom surface of the opening where each first color filter portion is located on the substrate falls within the orthographic projection of one of the raised portions on the substrate. The surface of the first color filter portion away from the substrate is flush with the surface of the non-first color filter portion away from the substrate. The surface of the light-shielding layer facing the substrate is entirely in contact with the color filter layer.

[0015] In one embodiment, a refractive index of the elevated portion is less than or equal to a refractive index of the color filter layer.

[0016] In one embodiment, the raised portion and the limiting layer are an integral structure.

[0017] In one embodiment, the raised portion and the limiting layer are separate structures.

[0018] In one embodiment, an orthographic projection of the elevated portion on the substrate falls within an orthographic projection of the first color filter portion on the substrate.

[0019] In one embodiment, an edge of an orthographic projection of the raised portion on the substrate is flush with an edge of an orthographic projection of the first color filter portion on the substrate.

[0020] In one embodiment, the display substrate further includes a defining layer located on the side of the encapsulation layer away from the substrate, the defining layer being provided with a plurality of openings, and the color filter portion being at least partially located within the openings; the surface of the defining layer away from the substrate is entirely covered by the first color filter portion, and the non-first color filter portion covers the portion of the first color filter portion located on the side of the defining layer away from the substrate; the surface of the shading layer facing the substrate is entirely in contact with the non-first color filter portion.

[0021] In one embodiment, the non-first color filter portion includes a second color filter portion and a third color filter portion; a portion of the first color filter portion located on the side of the defining layer away from the substrate is completely covered by the second color filter portion; or a portion of the first color filter portion located on the side of the defining layer away from the substrate is completely covered by the third color filter portion; or a portion of the first color filter portion located in the portion of the defining layer away from the substrate is covered by the second color filter portion, and another portion is covered by the third color filter portion.

[0022] In one embodiment, each of the second color filter portions is an integrated structure, or each of the third color filter portions is an integrated structure.

[0023] In one embodiment, each of the first color filter portions is an integrated structure.

[0024] In one embodiment, the refractive index of the color filter portion is greater than the refractive index of the defining layer.

[0025] In one embodiment, the display substrate further includes a planar layer located between the light shielding layer and the color filter layer, and the planar layer at least covers the first color filter portion.

[0026] In one embodiment, the orthographic projection of the planar layer on the substrate covers the orthographic projection of the color filter layer on the substrate, and the surface of the light-shielding layer facing the substrate is entirely in contact with the planar layer.

[0027] In one embodiment, the flat layer covers the first color filter portion, the surface of the flat layer away from the substrate is flush with the surface of the non-first color filter portion away from the substrate, and the surface of the light-shielding layer facing the substrate is partially in contact with the flat layer and partially in contact with the non-first color filter portion.

[0028] According to a second aspect of an embodiment of the present application, a method for preparing a display substrate is provided, the method comprising:

[0029] providing a substrate;

[0030] forming a light-emitting layer on the substrate, wherein the light-emitting layer includes a plurality of light-emitting structures arranged at intervals;

[0031] forming an encapsulation layer located on a side of the light-emitting layer away from the substrate;

[0032] forming a color filter layer located on a side of the encapsulation layer away from the substrate; the color filter layer comprising a plurality of color filter portions, the color filter portions comprising a first color filter portion and a non-first color filter portion having a color different from that of the first color filter portion, the thickness of the first color filter portion being smaller than the thickness of the non-first color filter portion, and a distance from a surface of the first color filter portion away from the substrate to the substrate being smaller than a distance from a surface of the non-first color filter portion away from the substrate to the substrate;

[0033] forming a light-shielding film layer on a side of the color filter layer away from the substrate, wherein the orthographic projection of the light-shielding film layer on the substrate covers the substrate; and wherein the thickness of the light-shielding film layer is greater than the height difference between the surface of the non-first color filter portion away from the substrate and the surface of the first color filter portion away from the substrate;

[0034] The light-shielding film layer is patterned to form a plurality of openings to obtain a light-shielding layer; the orthographic projection of one of the openings on the substrate falls within the orthographic projection of one of the color filter portions on the substrate.

[0035] In one embodiment, the thickness of the light-shielding film layer is greater than the maximum thickness of the light-shielding layer.

[0036] According to a third aspect of an embodiment of the present application, a display device is provided, comprising the above-mentioned display substrate.

[0037] The display substrate, its preparation method, and the display device provided by the embodiments of the present application are such that, since the surface of the light-shielding layer of the display substrate facing the substrate is basically flush, the problem of the light-shielding layer breaking or separation from the adjacent film layer due to the different thicknesses of the color filter portions of different colors causing the light-shielding layer to have a step difference facing the substrate can be avoided, thereby improving the yield of the display substrate. By arranging the light-shielding layer on the side of the first color filter portion away from the substrate, it helps to improve the dark state effect of the display substrate in the non-display state. By arranging the color filter layer on the side of the encapsulation layer away from the substrate, the color filter layer can filter the incident external ambient light, reduce the amount of reflection of the incident ambient light, and compared with the polarizer, can reduce the loss of the outgoing light, thereby improving the light extraction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] FIG1 is a partial cross-sectional view of a display substrate provided by an exemplary embodiment of the present application;

[0039] FIG2 is a partial cross-sectional view of a display substrate provided by another exemplary embodiment of the present application;

[0040] FIG3 is a partial cross-sectional view of a display substrate provided by yet another exemplary embodiment of the present application;

[0041] FIG4 is a partial cross-sectional view of a display substrate provided by another exemplary embodiment of the present application;

[0042] FIG5 is a partial cross-sectional view of a display substrate provided by another exemplary embodiment of the present application;

[0043] FIG6 is a partial cross-sectional view of a display substrate provided by another exemplary embodiment of the present application;

[0044] FIG7 is a schematic structural diagram of a first color filter portion of a display substrate provided by an exemplary embodiment of the present application;

[0045] FIG8 is a schematic structural diagram of a second color filter portion of a display substrate provided by an exemplary embodiment of the present application;

[0046] FIG9 is a schematic structural diagram of a third color filter portion of a display substrate provided by an exemplary embodiment of the present application;

[0047] FIG10 is a partial cross-sectional view of a display substrate provided by another exemplary embodiment of the present application;

[0048] FIG11 is a partial cross-sectional view of a display substrate provided by yet another exemplary embodiment of the present application;

[0049] FIG12 is a partial cross-sectional view of a first intermediate structure of a display substrate provided by an exemplary embodiment of the present application;

[0050] FIG13 is a partial cross-sectional view of a second intermediate structure of a display substrate provided by an exemplary embodiment of the present application;

[0051] FIG14 is a partial cross-sectional view of a third intermediate structure of a display substrate provided by an exemplary embodiment of the present application;

[0052] FIG15 is a partial cross-sectional view of a fourth intermediate structure of a display substrate provided by an exemplary embodiment of the present application;

[0053] FIG. 16 is a partial cross-sectional view of a display substrate provided by yet another exemplary embodiment of the present application. DETAILED DESCRIPTION

[0054] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0055] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0056] It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0057] The embodiments of the present application provide a display substrate and a display device. The display substrate and the display device in the embodiments of the present application are described in detail below with reference to the accompanying drawings. The features of the following embodiments may complement or be combined with each other unless they conflict.

[0058] The embodiment of the present application provides a display substrate. As shown in FIG1 , the display substrate includes a substrate 10 , a light emitting layer 20 located on the substrate 10 , an encapsulation layer 30 , a color filter layer 40 , and a light shielding layer 50 .

[0059] The light-emitting layer 20 includes a plurality of light-emitting structures 21 arranged in an interval. The encapsulation layer 30 is located on the side of the light-emitting layer 20 away from the substrate 10. The color filter layer 40 is located on the side of the encapsulation layer 30 away from the substrate 10. The color filter layer 40 includes a plurality of color filter sections 41. The color filter sections 41 include a first color filter section 411 and a non-first color filter section 412 having a different color from the first color filter section 411. The thickness of the first color filter section 411 is less than that of the non-first color filter section 412. The light-shielding layer 50 has a plurality of openings 51, and the orthographic projection of one opening 51 on the substrate falls within the orthographic projection of one color filter section 41 on the substrate 10. The light-shielding layer 50 is located on the side of the first color filter section 411 away from the substrate 10, and the surface of the light-shielding layer 50 facing the substrate 10 is substantially flush. The surface of the light shielding layer 50 facing the substrate 10 being substantially flush means that the surface of the light shielding layer 50 facing the substrate 10 is flush at all locations, or the distance difference between different regions of the surface of the light shielding layer 50 facing the substrate 10 and the substrate 10 is very small.

[0060] The display substrate provided by the embodiment of the present application has a light-shielding layer that is substantially flush with the surface of the substrate facing the light-shielding layer. This can avoid the problem of the light-shielding layer being broken or separated from the adjacent film layer due to the different thicknesses of the color filter portions of different colors, thereby improving the yield of the display substrate. By arranging the light-shielding layer on the side of the first color filter portion away from the substrate, it helps to improve the dark state effect of the display substrate in the non-display state. By arranging the color filter layer on the side of the encapsulation layer away from the substrate, the color filter layer can filter the incident external ambient light, reduce the amount of reflection of the incident ambient light, and compared with the polarizer, can reduce the loss of the outgoing light and improve the light extraction efficiency.

[0061] In one embodiment, the substrate 10 may be a flexible substrate or a rigid substrate. The flexible substrate may be made of one or more of polyimide, polyethylene terephthalate, polycarbonate, and an organic resin material. The organic resin material may include epoxy resin, triazine, silicone resin, or polyimide. The rigid substrate may be made of any of a glass substrate, a quartz substrate, and a sapphire substrate.

[0062] In one embodiment, as shown in FIG1 , the display substrate further includes a driving circuit layer 60 located between the substrate 10 and the light-emitting layer 20. The driving circuit layer 60 includes a plurality of pixel circuits, each configured to drive the light-emitting structure 21. The pixel circuits may correspond one to one with the light-emitting structure 21, with each pixel circuit configured to drive a corresponding light-emitting structure 21. The pixel circuits may include thin-film transistors and capacitors.

[0063] In one embodiment, the light emitting layer 20 includes at least three light emitting structures 21 emitting light of different colors. For example, the light emitting layer 20 may include a light emitting structure emitting red light, a light emitting structure emitting green light, and a light emitting structure emitting blue light.

[0064] In one embodiment, as shown in FIG1 , the light-emitting structure 21 includes a first electrode 211, a light-emitting material layer 212 located on a side of the first electrode 211 away from the substrate 10, and a second electrode 213 located on a side of the light-emitting material layer 212 away from the substrate 10. One of the first electrode 211 and the second electrode 213 is an anode, and the other is a cathode. The cathode can be a common electrode, and the cathodes of all light-emitting structures 21 are connected to form a surface electrode. In some embodiments, the light-emitting material layer 212 is an organic light-emitting material layer, and the light-emitting structure 21 is an OLED.

[0065] In one embodiment, as shown in FIG1 , the light-emitting layer 20 further includes a pixel definition layer 22 having a plurality of pixel openings 221. The pixel definition layer 22 is located on a side of the first electrode 211 away from the substrate 10, with each pixel opening 221 exposing at least a portion of the corresponding first electrode 211. The light-emitting material layer 212 of each light-emitting structure 21 is at least partially located within the pixel opening 221. The second electrode 213 is at least partially located on a side of the pixel definition layer 22 away from the substrate 10.

[0066] In one embodiment, the encapsulation layer 30 is a thin film encapsulation layer comprising alternating organic and inorganic layers, with the inorganic layer being the layer at the greatest distance from the substrate 10. For example, the thin film encapsulation layer may comprise two inorganic layers and an organic layer located between the two inorganic layers.

[0067] In one embodiment, as shown in FIG1 , the display substrate further comprises a defining layer 70 located on a side of the encapsulation layer 30 away from the substrate 10. The defining layer 70 is provided with a plurality of openings 71. The defining layer 70 is used to define each color filter portion 41. The color filter portion 41 is at least partially located within the openings 71. The color filter portions 41 and the openings 71 may correspond one to one, with each color filter portion 41 being at least partially located within a corresponding opening 71.

[0068] Furthermore, the refractive index of the limiting layer 70 is lower than that of the color filter 41. With this arrangement, light emitted from the light-emitting structure 21 passes through the color filter 41, enters the limiting layer 70, and is mostly reflected and emitted through the openings of the light-shielding layer 50, thereby reducing light loss and improving the light extraction efficiency of the display substrate.

[0069] Furthermore, the difference between the refractive index of the color filter portion 41 and the refractive index of the limiting layer 70 is in the range of 0.1 to 0.2.

[0070] In one embodiment, as shown in FIG1 , the display substrate further includes a protective layer 81 located on a side of the color filter layer 40 away from the substrate 10. The orthographic projection of the protective layer 81 on the substrate 10 covers the orthographic projection of the color filter layer 40 on the substrate 10 and also covers the orthographic projection of the light shielding layer 50 on the substrate 10. The material of the protective layer 81 can be an organic resin.

[0071] In one embodiment, the color filter layer 40 includes color filter portions 41 of at least three colors. Each color filter portion 41 corresponds one-to-one to the light-emitting structure 21. The orthographic projection of each color filter portion 41 on the substrate 10 overlaps the orthographic projection of the pixel opening 221 of the corresponding light-emitting structure 21 on the substrate 10. Furthermore, the color of each color filter portion 41 is the same as the color emitted by the corresponding light-emitting structure 21. This arrangement allows a greater amount of light emitted by the light-emitting structure 21 to enter the corresponding color filter portion 41, thereby improving light utilization.

[0072] The orthographic projection of the color filter portion 41 on the substrate 10 covers the orthographic projection of the pixel opening 221 corresponding to the light-emitting structure 21 on the substrate 10, which means that the area of ​​the orthographic projection of the color filter portion 41 on the substrate 10 is larger than the area of ​​the orthographic projection of the corresponding pixel opening 221 on the substrate 10, or the orthographic projection of the color filter portion 41 on the substrate 10 and the orthographic projection of the corresponding pixel opening 221 on the substrate 10 substantially overlap. Preferably, the area of ​​the orthographic projection of the color filter portion 41 on the substrate 10 is larger than the area of ​​the orthographic projection of the corresponding pixel opening 221 on the substrate 10, so that more light emitted by the light-emitting structure 21 can be incident on the corresponding color filter portion 41.

[0073] In one embodiment, as shown in Figure 1, the non-first color filter portion 412 includes a second color filter portion 413 and a third color filter portion 414. The first color filter portion 411 is a red filter portion, the second color filter portion 413 is a green filter portion, and the third color filter portion 414 is a blue filter portion. In other words, the thickness of the red filter portion 411 is less than that of the green filter portion, and less than that of the blue filter portion. The thickness relationship of the different color filter portions can ensure a white balance effect on the display substrate. In some embodiments, the thickness of the green filter portion can be the same as that of the blue filter portion.

[0074] In one embodiment, as shown in FIG1 , the entire first color filter portion 411 is located within the opening 71, and the surface of the first color filter portion 411 facing away from the substrate 10 is flush with the surface of the defining layer 70 facing away from the substrate 10. A portion of the surface of the light shielding layer 50 facing the substrate 10 contacts the first color filter portion 411, while another portion contacts the defining layer 70. The non-first color filter portion 412 is located partially on the side of the light shielding layer 50 facing away from the substrate 10. By arranging the surface of the first color filter portion 411 facing away from the substrate 10 to be flush with the surface of the defining layer 70 facing away from the substrate 10, the light shielding layer 50 can be prevented from breaking or separating from the first color filter portion 411 and the defining layer 70 when the light shielding layer 50 is formed between the surfaces of the first color filter portion 411 and the defining layer 70 facing away from the substrate. In the embodiment shown in FIG1 , adjacent first color filter portions 411 are spaced apart, adjacent second color filter portions 413 are spaced apart, and adjacent third color filter portions 414 are spaced apart.

[0075] Furthermore, as shown in FIG1 , the opening 71 where the first color filter portion 411 is located includes a first opening portion 711 and a second opening portion 712 located on a side of the first opening portion 711 away from the substrate 10. The second opening portion 712 includes a bottom surface 7121 located outside the first opening portion 711 and connected to a side surface of the first opening portion 711, and a side surface 7122 extending outward from an outer edge of the bottom surface 7121 away from the substrate 10. By providing the opening where the first color filter portion 411 includes the first opening portion 711 and the second opening portion 712, and the second opening portion 712 including the bottom surface 7121 connected to a side surface of the first opening portion 711, the second opening portion 712 can act as a buffer for the material of the first color filter portion 411 during formation, preventing the material of the first color filter portion 411 from overflowing the opening 71, thereby ensuring that the surface of the first color filter portion 411 away from the substrate 10 is substantially flush with the surface of the defining layer 70 away from the substrate 10.

[0076] Furthermore, the depth of the first opening 711 is about 2 μm, and the depth of the second opening 712 is about 1 μm.

[0077] In one embodiment, an exposure and development process can be used to form the opening 71 of the limiting layer 70. In the exposure and development process, a half-tone mask can be used to control the amount of light incident on different areas of the limiting layer 70, so that the shape of the opening 71 corresponding to the first color filter portion 411 is different from the shape of the opening 71 corresponding to the non-first color filter portion 412.

[0078] In one embodiment, as shown in Figures 2 and 3, the display substrate further includes a plurality of raised portions 82 located between the first color filter sections 411 and the encapsulation layer 30. The orthographic projection of the bottom surface of the opening 71 where each first color filter section 411 is located on the substrate 10 falls within the orthographic projection of one of the raised portions 82 on the substrate 10. The surface of the first color filter section 411 facing away from the substrate 10 is flush with the surface of the non-first color filter sections 412 facing away from the substrate 10. The entire surface of the light shielding layer 50 facing the substrate 10 contacts the color filter layer 40. Specifically, the surface of the light shielding layer 50 facing the substrate 10 partially contacts the first color filter sections 411 and partially contacts the non-first color filter sections 412. The raised portions 82 correspond to the first color filter sections 411 one-to-one, and the orthographic projection of the bottom surface of the opening 71 where each first color filter section 411 is located on the substrate 10 falls within the orthographic projection of the corresponding raised portion 82 on the substrate 10. The provision of the raised portion 82 increases the distance between the surface of the first color filter portion 411 away from the substrate 10 and the substrate 10, thereby making the surface of the first color filter portion 411 away from the substrate 10 and the surface of the non-first color filter portion 412 away from the substrate 10 substantially flush. This also means that the surface of the color filter layer 40 away from the substrate 10 is substantially flush, thereby preventing the light shielding layer 50 formed on the color filter layer 40 from breaking or separating from the first color filter portion 411 and the defining layer 70. The light shielding layer 50 is entirely located on the side of the color filter layer 40 away from the substrate 10, further enhancing the dark state effect of the display substrate in the non-display state. The thickness of the raised portion 82 can be equal to the difference between the thickness of the non-first color filter portion 412 and the thickness of the first color filter portion 411.

[0079] Furthermore, the refractive index of the raised portion 82 is less than or equal to the refractive index of the color filter layer 40. With this configuration, when light emitted by the light emitting structure 21 passes through the raised portion 82 and enters the color filter layer 40, the amount of light reflected can be reduced, thereby improving the light emission rate of the display substrate.

[0080] In one embodiment, as shown in Figure 2 , the raised portion 82 and the defining layer 70 are integrally formed. This arrangement allows the raised portion 82 and the defining layer 70 to be formed simultaneously, simplifying the display substrate manufacturing process. Specifically, when forming the openings 71 of the defining layer 70 using an exposure and development process, a halftone mask can be used to control the amount of light incident on different areas of the defining layer 70, thereby forming openings 71 of varying depths.

[0081] In another embodiment, as shown in FIG3 , the raised portion 82 is a separate structure from the limiting layer 70. The raised portion 82 is formed before the limiting layer 70, which makes it easier to control the thickness of the raised portion 82. The material of the raised portion 82 can be the same as or different from that of the limiting layer 70.

[0082] Furthermore, the orthographic projection of the raised portion 82 on the substrate 10 falls within the orthographic projection of the first color filter portion 411 on the substrate 10. This configuration prevents the raised portion 82 from extending below the non-first color filter portion 412, thereby raising the non-first color filter portion 412 away from the surface of the substrate 10.

[0083] Furthermore, the edge of the orthographic projection of the raised portion 82 on the substrate 10 is flush with the edge of the orthographic projection of the first color filter portion 411 on the substrate 10. This arrangement ensures that all areas of the surface of the first color filter portion 411 away from the substrate 10 are elevated by the raised portion 82, thereby making the surface of the first color filter portion 411 away from the substrate substantially flush with the surface of the non-first color filter portion 412 away from the substrate. It also avoids the problem of the surface of the non-first color filter portion 412 away from the substrate 10 being elevated, which would hinder the flushness of all areas of the surface of the color filter layer 40 away from the substrate 10.

[0084] In one embodiment, as shown in Figures 4 to 6, the surface of the defining layer 70 facing away from the substrate 10 is entirely covered by the first color filter portion 411, and the non-first color filter portion 412 covers the portion of the first color filter portion 411 located on the side of the defining layer 70 facing away from the substrate 10. The surface of the light shielding layer 50 facing the substrate 10 is entirely in contact with the non-first color filter portion 412. With this arrangement, the portion of the first color filter portion 411 covering the defining layer 70 facing away from the substrate 10 is flush, while the portion of the non-first color filter portion 412 covering the first color filter portion 411 facing away from the substrate 10 is flush. Consequently, the light shielding layer 50 formed on the surface of the non-first color filter portion 412 facing away from the substrate 10 is substantially flush with the surface of the substrate facing the substrate, thereby preventing the light shielding layer 50 from breaking or separating from the non-first color filter layer 412. Furthermore, the light shielding layer 50 is entirely located on the side of the color filter layer 40 facing away from the substrate 10, further enhancing the dark state effect of the display substrate when not displaying.

[0085] Further, as shown in Figure 4, the first color filter portion 411 is located in the portion of the limiting layer 70 away from the substrate 10, part of the area is covered by the second color filter portion 413, and another part of the area is covered by the third color filter portion 414; or, as shown in Figure 5, the portion of the first color filter portion 411 located in the portion of the limiting layer 70 away from the substrate 10 is completely covered by the second color filter portion 413; or, as shown in Figure 6, the portion of the first color filter portion 411 located in the portion of the limiting layer 70 away from the substrate 10 is completely covered by the third color filter portion 414.

[0086] Furthermore, as shown in Figure 7, each of the first color filter sections 411 is an integrated structure. The first color filter layer 401 formed by connecting the first color filter sections 411 is provided with a plurality of first through holes 4111 and a plurality of second through holes 4112. The orthographic projection of each first through hole 4111 on the substrate 10 overlaps the orthographic projection of an opening 71 on the substrate 10 where the second color filter section 413 is located, and the orthographic projection of each second through hole 4112 on the substrate 10 overlaps the orthographic projection of an opening 71 on the substrate 10 where the third color filter section 414 is located.

[0087] Furthermore, as shown in FIG8 , each second color filter portion 413 is an integral structure. The second color filter layer 402 formed by connecting the second color filter portions 413 is provided with a plurality of third through holes 4131 and a plurality of fourth through holes 4132. The orthographic projection of each third through hole 4131 on the substrate 10 overlaps the orthographic projection of an opening 71 on the substrate 10 where the first color filter portion 411 is located, and the orthographic projection of each fourth through hole 4132 on the substrate 10 overlaps the orthographic projection of an opening 71 on the substrate 10 where the third color filter portion 414 is located. As shown in FIG9 , the third color filter portions 414 are arranged at intervals. In other embodiments, the second color filter portions 413 are arranged at intervals, the third color filter portions 414 are an integrated structure, and the third color filter layer formed by connecting the third color filter portions 414 may be provided with a plurality of fifth through holes and a plurality of sixth through holes, and the orthographic projection of each fifth through hole on the substrate covers the orthographic projection of one first color filter portion 411 on the substrate, and the orthographic projection of each sixth through hole on the substrate covers the orthographic projection of one second color filter portion 413 on the substrate.

[0088] In one embodiment, as shown in Figures 10 and 11 , the display substrate further includes a planarization layer 83 positioned between the light-shielding layer 50 and the color filter layer 40. The planarization layer 83 at least covers the first color filter portion 411. Providing the planarization layer 83 that at least covers the first color filter portion 411 fills the height difference between the first color filter portion 411 and the non-first color filter portion 412, thereby preventing the light-shielding layer 50 from breaking or separating from adjacent layers due to the height difference between the first color filter portion 411 and the non-first color filter portion 412.

[0089] In one embodiment, as shown in FIG10 , the orthographic projection of the planarization layer 83 on the substrate covers the orthographic projection of the color filter layer 40 on the substrate, and the entire surface of the light-shielding layer 50 facing the substrate 10 is in contact with the planarization layer 83. In other words, the planarization layer 83 covers the surface of the first color filter portion 411 facing away from the substrate 10 and the surface of the non-first color filter layer 412 facing away from the substrate 10. The surface of the planarization layer 83 facing away from the substrate 10 is flush throughout. In this embodiment, the preparation of the planarization layer 83 is relatively simple.

[0090] In another embodiment, as shown in FIG11 , the planarization layer 83 covers the first color filter portion 411. The surface of the planarization layer 83 facing away from the substrate 10 is flush with the surface of the non-first color filter portion 412 facing away from the substrate 10. The surface of the light-shielding layer 50 facing the substrate 10 partially contacts the planarization layer 83 and partially contacts the non-first color filter portion 412. This arrangement reduces the distance between the light-shielding layer 50 and the color filter portion 41, helping to reduce the amount of light emitted by the light-emitting structure 21 absorbed by the light-shielding layer 50 and improving the light emission efficiency. Furthermore, the light-shielding layer 50 is entirely located on the side of the color filter layer 40 facing away from the substrate 10, further enhancing the dark state effect of the display substrate when it is not displaying.

[0091] In one embodiment, the planar layer 83 and the protective layer 81 may be made of the same material, which helps to improve the bonding strength between the planar layer 83 and the protective layer 81. In other embodiments, the planar layer 83 and the protective layer 81 may be made of different materials.

[0092] The present application also provides a method for preparing a display substrate. The method comprises the following steps:

[0093] First, a substrate is provided.

[0094] In one embodiment, the substrate may be a flexible substrate or a rigid substrate. The flexible substrate may be made of one or more of polyimide, polyethylene terephthalate, polycarbonate, and an organic resin material. The organic resin material may include epoxy resin, triazine, silicone resin, or polyimide. The rigid substrate may be made of any of a glass substrate, a quartz substrate, and a sapphire substrate.

[0095] Subsequently, a light-emitting layer is formed on the substrate, wherein the light-emitting layer includes a plurality of light-emitting structures arranged at intervals.

[0096] In one embodiment, before forming the light emitting layer on the substrate, the preparation method further comprises: forming a driving circuit layer on the substrate, wherein the driving circuit layer comprises a plurality of pixel circuits.

[0097] In one embodiment, the light-emitting layer includes at least three light-emitting structures that emit light of different colors. For example, the light-emitting layer may include a light-emitting structure that emits red light, a light-emitting structure that emits green light, and a light-emitting structure that emits blue light. The light-emitting structures may be OLEDs.

[0098] Then, an encapsulation layer is formed on a side of the light emitting layer away from the substrate.

[0099] In one embodiment, the encapsulation layer is a thin film encapsulation layer, which includes organic layers and inorganic layers arranged alternately, and the film layer with the largest distance from the substrate is the inorganic layer.

[0100] Subsequently, a color filter layer is formed on the side of the encapsulation layer away from the substrate; the color filter layer includes a plurality of color filter portions, the color filter portions include a first color filter portion and a non-first color filter portion having a color different from that of the first color filter portion, the thickness of the first color filter portion is smaller than the thickness of the non-first color filter portion, and the distance from the surface of the first color filter portion away from the substrate to the substrate is smaller than the distance from the surface of the non-first color filter portion away from the substrate to the substrate.

[0101] In one embodiment, before forming the color filter layer located on the side of the encapsulation layer away from the substrate, the preparation method further includes: forming a limiting layer on the side of the encapsulation layer away from the substrate, the limiting layer having a plurality of openings, and the limiting layer being used to limit each color filter portion.

[0102] In one embodiment, the color filter portion is at least partially located in the opening. The color filter portion and the opening may correspond one to one, and each color filter portion is at least partially located in the corresponding opening.

[0103] Subsequently, a light-shielding film layer is formed on the side of the color filter layer away from the substrate, and the orthographic projection of the light-shielding film layer on the substrate covers the substrate; the thickness of the light-shielding film layer is greater than the height difference between the surface of the non-first color filter portion away from the substrate and the surface of the first color filter portion away from the substrate.

[0104] The above steps result in the first intermediate structure shown in Figure 12 . As shown in Figure 12 , the thickness of the light-shielding film layer 501 is greater than the height difference between the surface of the non-first color filter portion 412 away from the substrate 10 and the surface of the first color filter portion 411 away from the substrate 10. This configuration allows the light-shielding film layer 501 to fill the step between the first color filter portion 411 and the non-first color filter portion 412 during formation, thereby preventing the light-shielding film layer 501 from breaking at the interface between the non-first color filter portion 412 and the first color filter portion 411, and preventing separation from the color filter layer.

[0105] Subsequently, the light-shielding film layer is patterned to form a plurality of openings to obtain a light-shielding layer; the orthographic projection of one of the openings on the substrate falls within the orthographic projection of one of the color filter portions on the substrate.

[0106] In one embodiment, the light shielding film layer 501 may be patterned using an exposure and development process, and a half-tone mask may be used during the exposure and development process to control the amount of light incident on different areas of the light shielding film layer 501 .

[0107] In one embodiment, a halftone mask is placed on the side of the first intermediate structure away from the substrate to obtain a second intermediate structure as shown in FIG13. As shown in FIG13, the halftone mask 91 used includes a first mask area 911, a second mask area 912, and a third mask area 913. The transmittance of the first mask area 911 is lower than the transmittance of the second mask area 912, and the transmittance of the second mask area 912 is lower than the transmittance of the third mask area 913. The transmittance of the first mask area 911 can be zero. The material of the light-shielding film layer 501 is positive photoresist. The portion of the light-shielding film layer 501 incident by light passing through the halftone mask 91 can be subsequently dissolved and removed by a developer. The third mask region 913 is opposite the opening 71 of the defining layer 70. The area of ​​the light shielding film layer 501 opposite the third mask region 913 is ultimately completely removed, forming an opening. In the area of ​​the light shielding film layer 501 opposite the surface of the defining layer 70 away from the substrate 10, the area in contact with the non-first color filter portion 412 is opposite the second mask region 912, and the area in contact with the first color filter portion 411 is opposite the first mask region 911. The thickness of the light shielding layer 50 in contact with the first color filter portion 411 is greater than the thickness of the area in contact with the second color filter portion 412. In some embodiments, the transmittance of the second mask region 912 can be 50%, and the transmittance of the third mask region 913 can be 25%.

[0108] In another embodiment, a halftone mask is placed on a side of the first intermediate structure away from the substrate to obtain a third intermediate structure as shown in FIG14. As shown in FIG14, the halftone mask 92 used includes a fourth mask area 921, a fifth mask area 922, and a sixth mask area 923. The transmittance of the fourth mask area 921 is greater than the transmittance of the fifth mask area 922, the transmittance of the fifth mask area 922 is greater than the transmittance of the sixth mask area 923, and the transmittance of the sixth mask area 923 is zero. The material of the light-shielding film layer 501 is a negative photoresist. The portion of the light-shielding film layer 501 incident on light passing through the halftone mask 92 will not be subsequently dissolved by the developer, while the portion not incident on light can be subsequently dissolved by the developer and removed. The sixth mask area 923 is opposite the opening 71 of the defining layer 70. The area of ​​the light shielding film layer 501 opposite the sixth mask area 923 is ultimately completely removed, forming an opening. In the area of ​​the light shielding film layer 501 opposite the surface of the defining layer 70 away from the first color filter portion 412, the area in contact with the first color filter portion 411 is opposite the fourth mask area 921. The thickness of the portion of the light shielding layer 500 in contact with the first color filter portion 411 is greater than the thickness of the portion in contact with the second color filter portion 412. In some embodiments, the transmittance of the fourth mask area 921 can be 50%, and the transmittance of the fifth mask area 922 can be 20%.

[0109] The fourth intermediate structure shown in Figure 15 is obtained by patterning the light shielding film layer. As shown in Figure 15, the surface of the light shielding layer 50 away from the substrate 10 is flush at all locations.

[0110] In one embodiment, the thickness of the light shielding film layer 501 is greater than the maximum thickness of the light shielding layer 50. This helps to prevent the light shielding film layer 501 from breaking.

[0111] In one embodiment, after patterning the light-shielding film layer, the method for manufacturing a display substrate further includes forming a protective layer. This step can produce the display substrate shown in FIG16 . As shown in FIG16 , the protective layer 81 covers the light-shielding layer 50 and the areas of the color filter layer 40 not covered by the light-shielding layer 50.

[0112] The present invention also provides a display substrate, as shown in FIG16 , comprising a substrate 10 , a light-emitting layer 20 , an encapsulation layer 30 , a color filter layer 40 , and a light-shielding layer 50 .

[0113] The light-emitting layer 20 includes a plurality of light-emitting structures 21 arranged in an interval. The encapsulation layer 30 is located on the side of the light-emitting layer 20 away from the substrate 10. The color filter layer 40 is located on the side of the encapsulation layer 30 away from the substrate 10. The color filter layer 40 includes a plurality of color filter sections 41, each of which includes a first color filter section 411 and a non-first color filter section 412 having a different color from the first color filter section 411. The thickness of the first color filter section 411 is less than that of the non-first color filter section 412. The light-shielding layer 50 has a plurality of openings 51, and the orthographic projection of one opening 51 on the substrate falls within the orthographic projection of one color filter section 41 on the substrate 10. The light-shielding layer 50 is located on the side of the color filter layer 40 away from the substrate 10, and the surface of the light-shielding layer 50 away from the substrate 10 is substantially flush. The light shielding layer 50 is in direct contact with the surface of the first color filter portion 411 away from the substrate 10 and the surface of the non-first color filter portion 412 away from the substrate 10 .

[0114] The embodiment of the display substrate provided in the embodiment of the present application and the embodiment of the method for preparing the display substrate described above belong to the same inventive concept, and the description of relevant details and beneficial effects can be referred to each other, which will not be repeated here.

[0115] The present application also provides a display device, which includes the display substrate described in any of the above embodiments.

[0116] In one embodiment, the display device further includes a driver and a power supply circuit, wherein the driver is configured to provide a driving signal for driving the light-emitting structure to emit light, and the power supply circuit is configured to supply power to the display substrate.

[0117] In one embodiment, the display device further includes a housing, and the display substrate is disposed in the housing.

[0118] The display device provided in the embodiments of the present application may be, for example, a mobile phone, a tablet computer, a television, a laptop computer, an in-vehicle device, or any other device with a display function.

[0119] It should be noted that in the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It will also be understood that when an element or layer is referred to as being "on" another element or layer, it may be directly on the other element, or there may be an intermediate layer. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it may be directly under the other element, or there may be more than one intermediate layer or element. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it may be the only layer between the two layers or elements, or there may also be more than one intermediate layer or element. Similar reference numerals throughout the text indicate similar elements.

[0120] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the contents disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0121] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A display substrate, characterized in that, the display substrate includes: a substrate; a light-emitting layer located on the substrate, the light-emitting layer including a plurality of spaced-apart light-emitting structures; a packaging layer located on a side of the light-emitting layer away from the substrate; a color filter layer located on a side of the packaging layer away from the substrate, the color filter layer including a plurality of color filter portions, the color filter portions including a first color filter portion and a non-first color filter portion having a color different from that of the first color filter portion, the thickness of the first color filter portion being less than the thickness of the non-first color filter portion; a light-shielding layer provided with a plurality of openings, a positive projection of one of the openings on the substrate falling within a positive projection of one of the color filter portions on the substrate; the light-shielding layer is located on a side of the first color filter portion away from the substrate, and a surface of the light-shielding layer facing the substrate is substantially flush.

2. The display substrate according to claim 1, characterized in that, the display substrate further includes a defining layer located on a side of the packaging layer away from the substrate, the defining layer being provided with a plurality of openings, at least a part of the color filter portion being located within the openings; the first color filter portion is entirely located within the openings, and a surface of the first color filter portion away from the substrate is flush with a surface of the defining layer away from the substrate; a part of the surface of the light-shielding layer facing the substrate is in contact with the first color filter portion, and another part of the surface is in contact with the defining layer; a part of the non-first color filter portion is located on a side of the light-shielding layer away from the substrate.

3. The display substrate according to claim 2, characterized in that, the opening where the first color filter portion is located includes a first opening portion and a second opening portion located on a side of the first opening portion away from the substrate, the second opening portion including a bottom surface located outside the first opening portion and connected to a side surface of the first opening portion, and a side surface formed by extending outward from an outer edge of the bottom surface in a direction away from the substrate.

4. The display substrate according to claim 1, characterized in that, the display substrate further includes a defining layer located on a side of the packaging layer away from the substrate, the defining layer being provided with a plurality of openings, at least a part of the color filter portion being located within the openings; the display substrate further includes a plurality of heightening portions, the heightening portions being located between the first color filter portion and the packaging layer, a positive projection of a bottom surface of an opening where each first color filter portion is located on the substrate falling within a positive projection of one of the heightening portions on the substrate; a surface of the first color filter portion away from the substrate is flush with a surface of the non-first color filter portion away from the substrate; a surface of the light-shielding layer facing the substrate is entirely in contact with the color filter layer.

5. The display substrate according to claim 4, characterized in that, the refractive index of the heightening portion is less than or equal to the refractive index of the color filter layer.

6. The display substrate according to claim 4, characterized in that, the heightening portion and the defining layer are of an integral structure.

7. The display substrate according to claim 4, characterized in that, The heightening part and the defining layer are of a split structure.

8. The display substrate according to claim 7, wherein, the orthographic projection of the heightening part on the substrate falls within the orthographic projection of the first color filter part on the substrate.

9. The display substrate according to claim 8, wherein, the edge of the orthographic projection of the heightening part on the substrate is flush with the edge of the orthographic projection of the first color filter part on the substrate.

10. The display substrate according to claim 1, wherein, the display substrate further includes a defining layer on a side of the encapsulation layer away from the substrate, the defining layer is provided with a plurality of openings, and at least a part of the color filter part is located within the openings; the entire surface of the defining layer away from the substrate is covered by the first color filter part, and the non-first color filter part covers a part of the first color filter part on a side of the defining layer away from the substrate; the surface of the light-shielding layer facing the substrate is entirely in contact with the non-first color filter part.

11. The display substrate according to claim 10, wherein, the non-first color filter part includes a second color filter part and a third color filter part; the entire part of the first color filter part on a side of the defining layer away from the substrate is covered by the second color filter part; or the entire part of the first color filter part on a side of the defining layer away from the substrate is covered by the third color filter part; or in the part of the first color filter part on a side of the defining layer away from the substrate, a part of the area is covered by the second color filter part, and another part of the area is covered by the third color filter part.

12. The display substrate according to claim 11, wherein, each of the second color filter parts is of an integral structure, or each of the third color filter parts is of an integral structure.

13. The display substrate according to claim 10, wherein, each of the first color filter parts is of an integral structure.

14. The display substrate according to any one of claims 2 to 13, wherein, the refractive index of the color filter part is greater than the refractive index of the defining layer.

15. The display substrate according to claim 1, wherein, the display substrate further includes a planarization layer between the light-shielding layer and the color filter layer, and the planarization layer covers at least the first color filter part.

16. The display substrate according to claim 15, wherein, the orthographic projection of the planarization layer on the substrate covers the orthographic projection of the color filter layer on the substrate, and the entire surface of the light-shielding layer facing the substrate is in contact with the planarization layer.

17. The display substrate according to claim 15, wherein, the planarization layer covers the first color filter part, the surface of the planarization layer away from the substrate is flush with the surface of the non-first color filter part away from the substrate, and a part of the surface of the light-shielding layer facing the substrate is in contact with the planarization layer, and a part is in contact with the non-first color filter part.

18. A method for manufacturing a display substrate, wherein, the manufacturing method includes: Provide a substrate; Form a light-emitting layer on the substrate, the light-emitting layer including a plurality of spaced-apart light-emitting structures; Form a packaging layer on a side of the light-emitting layer away from the substrate; Form a color filter layer on a side of the packaging layer away from the substrate; the color filter layer includes a plurality of color filter portions, the color filter portion includes a first color filter portion and a non-first color filter portion having a color different from that of the first color filter portion, the thickness of the first color filter portion is less than the thickness of the non-first color filter portion, and the distance from the surface of the first color filter portion away from the substrate to the substrate is less than the distance from the surface of the non-first color filter portion away from the substrate to the substrate; Form a light-shielding film layer on a side of the color filter layer away from the substrate, a positive projection of the light-shielding film layer on the substrate covers the substrate; the thickness of the light-shielding film layer is greater than a height difference between a surface of the non-first color filter portion away from the substrate and a surface of the first color filter portion away from the substrate; Perform patterning on the light-shielding film layer to form a plurality of openings, obtaining a light-shielding layer; a positive projection of one of the openings on the substrate falls within a positive projection of one of the color filter portions on the substrate.

19. The method for manufacturing a display substrate according to claim 18, wherein, the thickness of the light-shielding film layer is greater than the maximum thickness of the light-shielding layer.

20. A display device, wherein, the display device includes the display substrate according to any one of claims 1 to 19. ​

Images