Display substrate and display device

Abstract

A display substrate and a display device. The display substrate comprises a base substrate (101) and a color film structure layer (105). The color film structure layer (105) comprises: a light extraction layer (107) comprising a plurality of light extraction portions; a color film layer (108) comprising a plurality of color filters, wherein portions of two adjacent color filters are located on the side of a same light extraction portion distant from the base substrate (101) and are both in contact with the surface of the side of the light extraction portion distant from the base substrate (101); a black matrix layer (109) located on the side of the color film layer (108) distant from the base substrate (101) and comprising a plurality of black matrices; and a plurality of improvement portions located on the side of the black matrix layer (109) close to the base substrate (101), wherein the orthographic projection of each black matrix on the base substrate (101) is located within the orthographic projection of a corresponding improvement portion on the base substrate (101), the surface of the side of the improvement portion distant from the base substrate (101) is in contact with the surface of the side of the black matrix close to the base substrate (101), and a step height between contacting surfaces of the improvement portion and the black matrix is less than or equal to 0.2 microns.

Description

Display substrate and display device

[0001] This application claims priority to Chinese Patent Application No. 202510019635.4, filed on January 6, 2025, entitled “Display Substrate and Display Device”, the contents of which are to be understood as incorporated herein by reference. Technical Field

[0002] This article relates to, but is not limited to, the field of display technology, and in particular to a display substrate and a display device. Background Technology

[0003] Organic light-emitting diodes (OLEDs) and quantum dot light-emitting diodes (QLEDs) are active-matrix display devices with advantages such as self-illumination, wide viewing angle, high contrast, low power consumption, extremely high response speed, thinness, flexibility, and low cost. With the continuous development of display technology, flexible displays using OLEDs or QLEDs as light-emitting devices and controlled by thin-film transistors (TFTs) have become the mainstream products in the display field. Summary of the Invention

[0004] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0005] This disclosure provides a display substrate and a display device.

[0006] On one hand, this disclosure provides a display substrate, including a substrate and a color filter structure layer located on the substrate; the color filter structure layer includes:

[0007] The light extraction layer includes multiple light extraction sections, and the multiple light extraction sections form multiple light exit ports;

[0008] The color filter layer includes multiple color filters, with portions of two adjacent color filters located on the same side of the light extraction portion away from the substrate and both in contact with the surface of the light extraction portion away from the substrate.

[0009] A black matrix layer is located on the side of the color filter layer away from the substrate and includes a plurality of black matrices;

[0010] Multiple improvement sections are located on the side of the black matrix layer closest to the substrate, and the multiple improvement sections are arranged in pairs with the multiple black matrices. The orthographic projection of the black matrix onto the plane of the substrate is located within the orthographic projection of the improvement section paired with it onto the plane of the substrate. The surface of the improvement section away from the substrate is in contact with the surface of the black matrix close to the substrate, and the step difference between the surfaces of the improvement section and the black matrix in contact is less than or equal to 0.2 micrometers.

[0011] In some exemplary embodiments, at least one of the improvement parts is disposed in the same layer as the color filter.

[0012] In some exemplary embodiments, the plurality of light-emitting ports include a first light-emitting port, a second light-emitting port, and a third light-emitting port, and the plurality of color filters include a first color filter, a second color filter, and a third color filter. The orthographic projection of the first color filter onto the plane of the substrate at least partially overlaps with the orthographic projection of the first light-emitting port onto the plane of the substrate. The orthographic projection of the second color filter onto the plane of the substrate at least partially overlaps with the orthographic projection of the second light-emitting port onto the plane of the substrate. The orthographic projection of the third color filter onto the plane of the substrate at least partially overlaps with the orthographic projection of the third light-emitting port onto the plane of the substrate.

[0013] The plurality of improvement sections include a first improvement section, a second improvement section, and a third improvement section. The first improvement section is located between the first color filter and the second color filter. The second improvement section is located between the second color filter and the third color filter. The third improvement section is located between the third color filter and another first color filter.

[0014] At least one of the first improvement section, the second improvement section, and the third improvement section is an integral structure interconnected with one of the first color filter, the second color filter, and the third color filter.

[0015] In some exemplary embodiments, the first improving portion and the second color filter are an integrally connected structure, the second improving portion and the third color filter are an integrally connected structure, and the third improving portion and the first color filter are an integrally connected structure; or...

[0016] The first improvement part and the first color filter are an integral structure connected to each other, the second improvement part and the second color filter are an integral structure connected to each other, and the third improvement part and the third color filter are an integral structure connected to each other.

[0017] In some exemplary embodiments, the first improvement portion, the third improvement portion, and the first color filter are an integrally connected structure, and the second improvement portion and the third color filter are an integrally connected structure; or,

[0018] The second improvement section, the third improvement section, and the third color filter are an integral structure connected to each other; the first improvement section and the first color filter are an integral structure connected to each other; or,

[0019] The first improvement section, the second improvement section, and the second color filter are an integrally connected structure; the third improvement section and the third color filter are an integrally connected structure; or...

[0020] The second improvement section, the third improvement section, and the third color filter are an integral structure connected to each other, and the first improvement section and the second color filter are an integral structure connected to each other.

[0021] In some exemplary embodiments, the plurality of improvement units are arranged on the same layer.

[0022] In some exemplary embodiments, each of the improvement portions includes two or more improvement layers stacked together; the multiple improvement layers that are in contact with the surfaces of the multiple black matrices on the side near the substrate are disposed in the same layer.

[0023] In some exemplary embodiments, the plurality of improvement layers that are in contact with the surfaces of the plurality of black matrices near the substrate are disposed in the same layer as the color filter.

[0024] In some exemplary embodiments, each of the improved portions includes a first improved layer and a second improved layer, wherein the second improved layer is farther away from the substrate than the first improved layer, and the surface of the second improved layer on the side farther away from the substrate contacts the surface of the black matrix on the side closer to the substrate; a plurality of second improved layers are disposed in the same layer.

[0025] In some exemplary embodiments, the first improvement layer includes a first portion and a second portion, and the orthographic projection of the second improvement layer onto the plane where the substrate is located includes the orthographic projections of the first portion and the second portion onto the plane where the substrate is located; the second improvement layer, the first portion, and the second portion are respectively disposed in the same layer as different color filters.

[0026] In some exemplary embodiments, the second improvement layer includes a first extension and a second extension connected to each other, the first extension extending in a direction parallel to the plane of the substrate, the second extension extending toward the plane of the substrate, and the first extension being farther away from the substrate than the second extension, the second extension being located between the first extension and the second extension and in contact with the light extraction portion; or, the second improvement layer is located on the side of the first improvement layer away from the substrate.

[0027] In some exemplary embodiments, the first improvement layer includes a first portion and a second portion, and the orthographic projection of the second improvement layer onto the plane where the substrate is located includes the orthographic projections of the first portion and the second portion onto the plane where the substrate is located; at least the first portion and the second portion of the first improvement layer are an integral structure interconnected.

[0028] In some exemplary embodiments, the first improvement layer and the second improvement layer of at least one of the improvement portions are an integral structure that is interconnected.

[0029] In some exemplary embodiments, each of the improvement sections includes a first improvement layer, a second improvement layer, and a third improvement layer, and the first improvement layer, the second improvement layer, and the third improvement layer are respectively disposed in the same layer as different color filters.

[0030] On the other hand, embodiments of this disclosure provide a display device including the display substrate described in any of the foregoing embodiments.

[0031] After reading and understanding the accompanying diagrams and detailed descriptions, the other aspects can be understood.

[0032] Overview of the attached figures

[0033] The accompanying drawings are used to provide an understanding of the technical solutions of this disclosure and form part of the specification. They are used together with the embodiments of this disclosure to explain the technical solutions of this disclosure and do not constitute a limitation on the technical solutions of this disclosure.

[0034] Figure 1 is a schematic diagram of a display device;

[0035] Figure 2 is a schematic diagram of a planar structure of a display substrate;

[0036] Figure 3A is a partial cross-sectional schematic diagram of a display substrate according to an embodiment of the present disclosure;

[0037] Figure 3B is a magnified view of the part marked A in Figure 3A;

[0038] Figure 4 is a partial cross-sectional schematic diagram of a display substrate according to an embodiment of the present disclosure;

[0039] Figure 5 is a partial cross-sectional schematic diagram of a display substrate according to an embodiment of the present disclosure;

[0040] Figure 6 is a partial cross-sectional schematic diagram of a display substrate according to another embodiment of the present disclosure;

[0041] Figure 7 is a partial cross-sectional schematic diagram of a display substrate according to another embodiment of the present disclosure;

[0042] Figure 8 is a partial cross-sectional schematic diagram of a display substrate according to another embodiment of the present disclosure;

[0043] Figure 9 is a partial cross-sectional schematic diagram of a display substrate according to another embodiment of the present disclosure;

[0044] Figure 10 is a second partial cross-sectional schematic diagram of a display substrate according to yet another embodiment of the present disclosure;

[0045] Figure 11 is a partial cross-sectional schematic diagram of a display substrate according to yet another embodiment of the present disclosure;

[0046] Figure 12A is a partial cross-sectional schematic diagram of a display substrate according to an embodiment of the present disclosure;

[0047] Figure 12B is a magnified view of the part marked B in Figure 12A;

[0048] Figure 13 is a partial cross-sectional schematic diagram of a display substrate according to an embodiment of the present disclosure;

[0049] Figure 14 is a partial cross-sectional schematic diagram of a display substrate according to another embodiment of the present disclosure;

[0050] Figure 15 is a partial cross-sectional schematic diagram of a display substrate according to another embodiment of the present disclosure;

[0051] Figure 16 is a partial cross-sectional schematic diagram of a display substrate according to another embodiment of the present disclosure.

[0052] Detailed Explanation

[0053] The embodiments of this disclosure will be described below with reference to the accompanying drawings. The implementation can be carried out in many different forms. Those skilled in the art will readily understand that the methods and content can be changed to one or more forms without departing from the spirit and scope of this disclosure. Therefore, this disclosure should not be construed as limited to the content described in the following embodiments. Without conflict, the embodiments and features in the embodiments of this disclosure can be arbitrarily combined with each other.

[0054] In the accompanying drawings, the size of one or more constituent elements, the thickness of layers, or areas are sometimes exaggerated for clarity. Therefore, this disclosure is not necessarily limited to these dimensions, and the shapes and sizes of the components in the drawings do not reflect true proportions. Furthermore, the drawings schematically illustrate ideal examples, and this disclosure is not limited to the shapes or values ​​shown in the drawings.

[0055] The ordinal numbers such as "first," "second," and "third" in this disclosure are used to avoid confusion among the constituent elements, not to limit the quantity. "Multiple" in this disclosure includes two or more quantities.

[0056] In this disclosure, for convenience, terms such as "middle," "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are used to indicate orientation or positional relationships in conjunction with the accompanying drawings. This is solely for the purpose of facilitating the description and simplification of the specification, and does not imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this disclosure. The positional relationships of the constituent elements may be appropriately changed depending on the direction in which the constituent elements are described. Therefore, the description is not limited to the terms used in the specification and may be appropriately replaced as appropriate.

[0057] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection via an intermediate component, or a connection within two components. Those skilled in the art will understand the meaning of these terms in this disclosure as appropriate.

[0058] In this disclosure, a transistor is a device that includes at least three terminals: a gate electrode, a drain electrode, and a source electrode. A transistor has a channel region between the drain electrode (drain electrode terminal, drain region, or drain) and the source electrode (source electrode terminal, source region, or source), and current can flow through the drain electrode, the channel region, and the source electrode. In this disclosure, the channel region refers to the region through which current primarily flows.

[0059] In this disclosure, the first electrode can be the drain electrode and the second electrode can be the source electrode, or vice versa. In cases where transistors with opposite polarities are used or the current direction changes during circuit operation, the functions of the "source electrode" and the "drain electrode" are sometimes interchanged. Therefore, in this disclosure, the "source electrode" and the "drain electrode" can be interchanged.

[0060] In this disclosure, "electrical connection" includes the situation where constituent elements are connected together by a component having a certain electrical function. There are no particular limitations on the "component having a certain electrical function," as long as it enables the transmission of electrical signals between the connected constituent elements. Examples of "component having a certain electrical function" include not only electrodes and wiring, but also switching elements such as transistors, resistors, inductors, capacitors, and other components having one or more functions.

[0061] In this disclosure, "parallel" refers to a state in which the angle formed by two straight lines is greater than or equal to -10° and less than 10°, and therefore can include a state in which the angle is greater than or equal to -5° and less than 5°. Furthermore, "perpendicular" refers to a state in which the angle formed by two straight lines is greater than or equal to 80° and less than 100°, and therefore can include a state in which the angle is greater than or equal to 85° and less than 95°.

[0062] In this disclosure, the terms "film" and "layer" can be interchanged. For example, sometimes "conductive layer" can be replaced with "conductive film". Similarly, sometimes "insulating film" can be replaced with "insulating layer".

[0063] In this disclosure, “about” means a value that is not strictly limited and allows for process and measurement errors.

[0064] This disclosure provides a display substrate, including a substrate and a color filter structure layer located on the substrate; the color filter structure layer includes:

[0065] The light extraction layer includes multiple light extraction sections, and the multiple light extraction sections form multiple light exit ports;

[0066] The color filter layer includes multiple color filters, with portions of two adjacent color filters located on the same side of the light extraction portion away from the substrate and both in contact with the surface of the light extraction portion away from the substrate.

[0067] A black matrix layer is located on the side of the color filter layer away from the substrate and includes a plurality of black matrices;

[0068] Multiple improvement sections are located on the side of the black matrix layer closest to the substrate, and the multiple improvement sections are arranged in pairs with the multiple black matrices. The orthographic projection of the black matrix onto the plane of the substrate is located within the orthographic projection of the improvement section paired with it onto the plane of the substrate. The surface of the improvement section away from the substrate is in contact with the surface of the black matrix close to the substrate, and the step difference between the surfaces of the improvement section and the black matrix in contact is less than or equal to 0.2 micrometers.

[0069] In this embodiment, by providing an improvement section and designing the step difference between the surface of the improvement section and the black matrix to be less than or equal to 0.2 micrometers, the surface of the improvement section and the black matrix in contact is approximately planar, which helps to ensure the morphology of the black matrix pattern. Compared with the technical solution where the surface of the black matrix close to the substrate contacts different components and the step difference between the surfaces of different components is too large, the display substrate in this embodiment can solve the problems of large differences in the morphology of the black matrix pattern and deterioration of the dark state effect in existing display substrates.

[0070] Figure 1 is a schematic diagram of a display device. As shown in Figure 1, the display device may include a timing controller, a data driver, a scan driver, a light-emitting driver, and a pixel array. The timing controller is connected to the data driver, the scan driver, and the light-emitting driver. The data driver is connected to multiple data signal lines (D1 to Dn), the scan driver is connected to multiple scan signal lines (S1 to Sm), and the light-emitting driver is connected to multiple light-emitting signal lines (E1 to Eo). The pixel array may include multiple sub-pixels Pxij, where i and j can be natural numbers. At least one sub-pixel Pxij may include a circuit unit and a light-emitting unit. The circuit unit may include at least a pixel driving circuit, which is connected to the scan signal lines, the light-emitting signal lines, and the data signal lines. The light-emitting unit may include a light-emitting device, which is connected to the pixel driving circuit of the circuit unit. In an exemplary embodiment, the timing controller can provide grayscale values ​​and control signals of specifications suitable for the data driver to the data driver, provide clock signals, scan start signals, etc. of specifications suitable for the scan driver to the scan driver, and provide clock signals, transmit stop signals, etc. of specifications suitable for the light-emitting driver to the light-emitting driver. The data driver can use grayscale values ​​and control signals received from the timing controller to generate data voltages to be provided to data signal lines D1, D2, D3, ..., Dn. For example, the data driver can sample grayscale values ​​using a clock signal and apply data voltages corresponding to the grayscale values ​​to data signal lines D1 to Dn in pixel rows, where n can be a natural number. The scan driver can generate scan signals to be provided to scan signal lines S1, S2, S3, ..., Sm by receiving clock signals, scan start signals, etc., from the timing controller. For example, the scan driver can sequentially provide scan signals with on-level pulses to scan signal lines S1 to Sm. For example, the scan driver can be configured as a shift register and can generate scan signals by sequentially transmitting scan start signals in the form of on-level pulses to the next stage circuit under the control of a clock signal, where m can be a natural number. The light-emitting driver can generate transmit signals to be provided to light-emitting signal lines E1, E2, E3, ..., Eo by receiving clock signals, transmit stop signals, etc., from the timing controller. For example, the light-emitting driver can sequentially provide transmit signals with cutoff level pulses to the light-emitting signal lines E1 to Eo, where o can be a natural number. For example, the light-emitting driver can be configured as a shift register and can generate transmit signals by sequentially transmitting transmit stop signals in the form of cutoff level pulses to the next stage circuit under the control of a clock signal. In an exemplary embodiment, a pixel array can be disposed on a display substrate.

[0071] Figure 2 is a schematic diagram of a planar structure of a display substrate. In an exemplary embodiment, the display substrate may include a display area and a border area surrounding the display area. As shown in Figure 2, the display area of ​​the display substrate may include a plurality of pixel units P arranged in a matrix. At least one pixel unit P may include a first sub-pixel P1 emitting a first color light, a second sub-pixel P2 emitting a second color light, and a third sub-pixel P3 emitting a third color light. Each sub-pixel may include a circuit unit and a light-emitting unit. The circuit unit may include at least a pixel driving circuit, which is connected to a scan signal line, a data signal line, and a light-emitting signal line, respectively. The pixel driving circuit is configured to receive the data voltage transmitted by the data signal line and output a corresponding current to the light-emitting device under the control of the scan signal line and the light-emitting signal line. The light-emitting unit may include at least a light-emitting device, which is connected to the pixel driving circuit of the sub-pixel and is configured to emit light of a corresponding brightness in response to the current output by the pixel driving circuit of the sub-pixel.

[0072] In some exemplary embodiments, the first sub-pixel P1 may be a red sub-pixel (R) emitting red light, the second sub-pixel P2 may be a green sub-pixel (G) emitting green light, and the third sub-pixel P3 may be a blue sub-pixel (B) emitting blue light. In one example, the shape of the sub-pixels may be rectangular, rhomboid, pentagonal, or hexagonal, and the three sub-pixels may be arranged in a horizontal, vertical, or triangular manner, etc., without limitation herein.

[0073] In some exemplary embodiments, a pixel unit may include four sub-pixels, which may be arranged in a horizontal, vertical, or square manner, etc., and this disclosure does not limit the arrangement.

[0074] Figure 3A is a partial cross-sectional schematic diagram of a display substrate according to an embodiment of the present disclosure. As shown in Figure 3A, the display device may include a display substrate, which may include a substrate 101 and a driving circuit layer 102, a light-emitting structure layer 103, an encapsulation layer 104, and a color filter structure layer 105 sequentially disposed on one side of the substrate 101. In some possible implementations, the display device may also include other film layers, which are not limited herein.

[0075] The substrate 101 can be a silicon-on-insulator (SOI) substrate or a glass substrate. The driving circuit layer 102 can be fabricated on the substrate 101 using silicon semiconductor processes (e.g., CMOS processes). The driving circuit layer 102 can include multiple circuit units, each of which can include at least a pixel driving circuit. The pixel driving circuit is connected to scan signal lines and data signal lines, respectively. The pixel driving circuit can include multiple transistors and storage capacitors. A transistor can include a gate electrode, a first electrode, and a second electrode. In this embodiment, the plane of the substrate is parallel to the plane of the display substrate.

[0076] The light-emitting structure layer 103 may include multiple light-emitting devices, which may include at least a first light-emitting device 301, a second light-emitting device 302, and a third light-emitting device 303. For example, the first light-emitting device 301 is configured to emit red light, the second light-emitting device 302 is configured to emit green light, and the third light-emitting device 303 is configured to emit blue light. The encapsulation layer 104 may employ thin-film encapsulation (TFE) to prevent external moisture from entering the light-emitting structure layer. In one example, the encapsulation layer 104 may include a first encapsulation layer, a second encapsulation layer, and a third encapsulation layer, with the second encapsulation layer located between the first and third encapsulation layers. The first and third encapsulation layers may both be made of inorganic materials, while the second encapsulation layer may be made of organic materials. The encapsulation layer 104 forms a stacked structure of inorganic / organic / inorganic materials, which prevents external moisture from entering the light-emitting structure layer and improves its reliability.

[0077] The color filter structure layer 105 may include a light-shielding layer 106, a light extraction layer 107, a color filter layer 108, a black matrix layer 109, and a protective layer 110, which are stacked sequentially. The light-shielding layer 106 can prevent crosstalk between the light emitted from two adjacent sub-pixels. The light extraction layer 107 has multiple light exit ports, which may include at least a first light exit port 107a, a second light exit port 107b, and a third light exit port 107c. The red light emitted by the first light-emitting device 301 can be emitted through the first light exit port 107a, the green light emitted by the second light-emitting device 302 can be emitted through the second light exit port 107b, and the blue light emitted by the third light-emitting device 303 can be emitted through the third light exit port 107c.

[0078] The color filter layer 108 may include at least a plurality of color filters (CFs), which may include at least a first color filter 801, a second color filter 802, and a third color filter 803. The orthographic projection of the first color filter 801 onto the plane of the substrate 101 at least partially overlaps with the orthographic projection of the first light-emitting port 107a onto the plane of the substrate 101, and the first color filter 801 is configured to allow only red light to be emitted. The orthographic projection of the second color filter 802 onto the plane of the substrate 101 at least partially overlaps with the orthographic projection of the second light-emitting port 107b onto the plane of the substrate 101, and the second color filter 802 is configured to allow only green light to be emitted. The orthographic projection of the third color filter 803 onto the plane of the substrate 101 at least partially overlaps with the orthographic projection of the third light-emitting port 107c onto the plane of the substrate 101, and the third color filter 803 is configured to allow only blue light to be emitted. The black matrix layer 109 may include multiple black matrices (BMs), which can be located between two adjacent color filters. The black matrix layer 109 can prevent crosstalk between the light emitted from two adjacent sub-pixels. The orthographic projection of the protective layer 110 (overcoating, abbreviated as OC) onto the plane of the substrate 101 may include the orthographic projection of the color filter layer 108 onto the plane of the substrate 101 and the orthographic projection of the black matrix layer 109 onto the plane of the substrate 101. The protective layer 110 can prevent water, oxygen, etc., from corroding the color filter layer 108, etc., and can improve the reliability of the display substrate. The material of the protective layer 110 may include optically clear adhesive (OCA), etc.

[0079] In an exemplary embodiment, as shown in FIG3A, the light extraction layer 107 may include a plurality of light extraction sections, which may form a plurality of light emission ports. The plurality of light extraction sections may include at least a first light extraction section 701, a second light extraction section 702, and a third light extraction section 703. The first light extraction section 701 is located between a first light emission port 107a and a second light emission port 107b; the second light extraction section 702 is located between the second light emission port 107b and a third light emission port 107c; ​​and the third light extraction section 703 is located between the third light emission port 107c and the first light emission port 107a. The orthographic projections of the first color filter 801 and the second color filter 802 onto the plane of the substrate 101 overlap with the orthographic projection of the first light extraction section 701 onto the plane of the substrate 101. The orthographic projections of the second color filter 802 and the third color filter 803 onto the plane of the substrate 101 overlap with the orthographic projection of the second light extraction unit 702 onto the plane of the substrate 101. The orthographic projections of the third color filter 803 and the first color filter 801 onto the plane of the substrate 101 overlap with the orthographic projection of the third light extraction unit 703 onto the plane of the substrate 101.

[0080] In one exemplary embodiment, the material of the light extraction layer 107 may include an inorganic material, such as silicon oxynitride (SiO2). x N y ) or silicon nitride (SiN) x ) or silicon oxide (SiO) x It can be any one or more of the following: ) . The light extraction layer 107 can be a single layer, multiple layers or a composite layer.

[0081] In an exemplary embodiment, as shown in FIG3A, the refractive index of the color filter layer 108 is greater than the refractive index of the light extraction layer 107. Red light is incident from the first color filter 801 onto the first light extraction section 701 and the third light extraction section 703. Since the refractive index of the first color filter 801 is greater than the refractive indices of the first light extraction section 701 and the third light extraction section 703, some red light will undergo total internal reflection at the interface between the first color filter 801 and the first light extraction section 701, and some red light will undergo total internal reflection at the interface between the first color filter 801 and the third light extraction section 703, thereby increasing the light extraction efficiency of the red light. Green light rays are emitted from the second color filter 802 towards the second light extraction section 702 and the first light extraction section 701. Since the refractive index of the second color filter 802 is greater than that of the second light extraction section 702 and the first light extraction section 701, some green light rays will undergo total internal reflection at the interface between the second color filter 802 and the second light extraction section 702, and some green light rays will undergo total internal reflection at the interface between the second color filter 802 and the first light extraction section 701, thereby increasing the light extraction efficiency of the green light rays. Blue light rays are emitted from the third color filter 803 towards the third light extraction section 703 and the second light extraction section 702. Since the refractive index of the third color filter 803 is greater than that of the third light extraction section 703 and the second light extraction section 702, some blue light rays will undergo total internal reflection at the interface between the third color filter 803 and the third light extraction section 703, and some blue light rays will undergo total internal reflection at the interface between the third color filter 803 and the second light extraction section 702, thereby increasing the light extraction efficiency of the blue light rays.

[0082] In an exemplary embodiment, as shown in FIG3A, the black matrix layer 109 may include a plurality of black matrices (BMs), which may include at least a first black matrix 901, a second black matrix 902, and a third black matrix 903. The plurality of black matrices and the plurality of light extraction units may be arranged in pairs. The first black matrix 901 is arranged in pairs with the first light extraction unit 701, and the orthographic projection of the first black matrix 901 onto the plane of the substrate 101 lies within the orthographic projection of the first light extraction unit 701 onto the plane of the substrate 101. The second black matrix 902 is arranged in pairs with the second light extraction unit 702, and the orthographic projection of the second black matrix 902 onto the plane of the substrate 101 lies within the orthographic projection of the second light extraction unit 702 onto the plane of the substrate 101. The third black matrix 903 is arranged in pairs with the third light extraction unit 703, and the orthographic projection of the third black matrix 903 onto the plane of the substrate 101 lies within the orthographic projection of the third light extraction unit 703 onto the plane of the substrate 101. As shown in Figure 3A, the color filter structure layer 105 may further include multiple improvement sections, each located between a black matrix and a paired light extraction section. The multiple improvement sections are paired with multiple black matrices, and the orthographic projection of the black matrix onto the plane of the substrate 101 lies within the orthographic projection of the paired improvement sections onto the plane of the substrate 101. The surface of the improvement section away from the substrate 101 contacts the surface of the black matrix near the substrate 101. In this embodiment, the step difference between the surfaces of the improvement section and the black matrix is ​​designed to be less than or equal to 0.2 micrometers. In this disclosure, the step difference refers to the distance between the point farthest from the substrate and the point closest to the substrate on the surface of the improvement section and the black matrix, along a direction perpendicular to the plane of the substrate. The improvement sections are configured to improve the flatness of the surface of the black matrix near the substrate 101. By providing the improvement sections, problems such as black matrix peeling and breakage can be improved. In this embodiment, by providing the improvement sections, it is beneficial to ensure the uniformity of the multiple black matrices.

[0083] The plurality of improvement sections may include at least a first improvement section 111, a second improvement section 112, and a third improvement section 113. The first improvement section 111 is located between the first black matrix 901 and the first light extraction section 701, and the orthographic projection of the first black matrix 901 onto the plane of the substrate 101 lies within the orthographic projection of the first improvement section 111 onto the plane of the substrate 101, and the orthographic projection of the first improvement section 111 onto the plane of the substrate 101 lies within the orthographic projection of the first light extraction section 701 onto the plane of the substrate 101. The second improvement section 112 is located between the second black matrix 902 and the second light extraction section 702, and the orthographic projection of the second black matrix 902 onto the plane of the substrate 101 lies within the orthographic projection of the second improvement section 112 onto the plane of the substrate 101, and the orthographic projection of the second improvement section 112 onto the plane of the substrate 101 lies within the orthographic projection of the second light extraction section 702 onto the plane of the substrate 101. The third improvement section 113 is located between the third black matrix 903 and the third light extraction section 703, and the orthographic projection of the third black matrix 903 onto the plane where the substrate 101 is located is within the orthographic projection of the third improvement section 113 onto the plane where the substrate 101 is located, and the orthographic projection of the third improvement section 113 onto the plane where the substrate 101 is located is within the orthographic projection of the third light extraction section 703 onto the plane where the substrate 101 is located.

[0084] In an exemplary embodiment, as shown in FIG3A, an improvement section is provided between each of two adjacent color filters. In this embodiment of the present disclosure, by providing the improvement section, it is beneficial to ensure the flatness of the surface of the black matrix on the side close to the substrate 101, and to ensure the uniformity of multiple black matrices.

[0085] In an exemplary embodiment, as shown in FIG3A, multiple improvement sections and the first color filter 801 can be disposed in the same layer. For example, the first improvement section 111, the third improvement section 113, and the first color filter 801 can be an integral structure interconnected. In the embodiments of this disclosure, "A and B are disposed in the same layer" means that A and B are formed by the same patterning process. The "patterning process" mentioned in the embodiments of this disclosure includes processes such as coating photoresist, mask exposure, development, etching, and photoresist stripping for metallic materials, inorganic materials, or transparent conductive materials; and processes such as coating organic materials, mask exposure, and development for organic materials. Deposition can be any one or more of sputtering, evaporation, and chemical vapor deposition; coating can be any one or more of spraying, spin coating, and inkjet printing; and etching can be any one or more of dry etching and wet etching. This disclosure does not limit the methods used.

[0086] In an exemplary embodiment, the light-emitting structure layer 103 may include multiple light-emitting devices. Each light-emitting device may include at least a first electrode, an organic light-emitting layer, and a second electrode. The first electrode is connected to the second electrode of a transistor via a connecting electrode. The organic light-emitting layer is connected to the first electrode, and the second electrode is connected to the organic light-emitting layer. The second electrode may be connected to a second power line, which can be used to transmit a low-level signal. The organic light-emitting layer emits light under the drive of the first and second electrodes. For example, the first electrode may be the anode of the light-emitting device, and the second electrode may be the cathode of the light-emitting device. In an exemplary embodiment, the organic light-emitting layer may include a light-emitting layer (EML) and any one or more of the following: a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer (EBL), a hole blocking layer (HBL), an electron transport layer (ETL), and an electron injection layer (EIL).

[0087] In an exemplary embodiment, as shown in FIG3A, the light-emitting structure layer 103 may further include a pixel definition layer 304, which may have a plurality of pixel openings. The plurality of pixel openings are paired with a plurality of light-emitting devices. Light emitted by the first light-emitting device 301 can be emitted through its paired pixel opening. Light emitted by the second light-emitting device 302 can be emitted through its paired pixel opening. Light emitted by the third light-emitting device 303 can be emitted through its paired pixel opening.

[0088] Figure 3B is a partially enlarged schematic diagram of the area marked A in Figure 3A. As shown in Figure 3B, the second black matrix 902 has at least one first edge 109a, the second improvement portion 112 has at least one second edge 112a, and the second light extraction portion 702 has at least one third edge 107d. The orthographic projection of the first edge 109a onto the plane of the substrate 101 lies within the orthographic projection of the second improvement portion 112 onto the plane of the substrate 101, and the orthographic projection of the second edge 112a onto the plane of the substrate 101 lies within the orthographic projection of the second light extraction portion 702 onto the plane of the substrate 101. The first edge 109a and the third edge 107d are separated by a distance d1 along a first direction, and the second edge 112a and the third edge 107d are separated by a distance d2 along the first direction, where d2 is less than d1. For example, d2 = 0.5 × d1. The first direction is parallel to the plane of the substrate 101, and multiple sub-pixels within the same pixel unit are arranged sequentially along the first direction.

[0089] In one exemplary embodiment, d1 can range from 4.0 micrometers to 6.0 micrometers, for example, d1 can be 5.0 micrometers.

[0090] In an exemplary embodiment, each black matrix has at least one first edge 109a, each improvement section has at least one second edge 112a, and each light extraction section has at least one third edge 107d. The black matrices, improvement sections, and light extraction sections are arranged in groups. For black matrices, improvement sections, and light extraction sections located in the same group, the orthographic projection of the first edge 109a onto the plane of the substrate 101 lies within the orthographic projection of the improvement section onto the plane of the substrate 101, and the orthographic projection of the second edge 112a onto the plane of the substrate 101 lies within the orthographic projection of the light extraction section onto the plane of the substrate 101. The first edge 109a and the third edge 107d have a distance d1 along a first direction, and the second edge 112a and the third edge 107d have a distance d2 along the first direction, where d2 is less than d1; for example, d2 = 0.5 × d1.

[0091] Figure 4 is a partial cross-sectional schematic diagram of a display substrate according to an embodiment of the present disclosure. As shown in Figure 4, the plurality of improvement portions and the second color filter 802 can be disposed on the same layer. For example, the second color filter 802, the first improvement portion 111, and the second improvement portion 112 can be an integral structure interconnected with each other. The structure of the display substrate of this exemplary embodiment can be referred to the description of the foregoing embodiments, and will not be repeated here.

[0092] Figure 5 is a partial cross-sectional schematic diagram of a display substrate according to an embodiment of the present disclosure. As shown in Figure 5, the plurality of improvement portions and the third color filter 803 can be disposed on the same layer. For example, the third color filter 803, the third improvement portion 113, and the second improvement portion 112 can be an integral structure interconnected with each other. The structure of the display substrate of this exemplary embodiment can be referred to the description of the foregoing embodiments, and will not be repeated here.

[0093] Figure 6 is a partial cross-sectional schematic diagram of a display substrate according to another embodiment of this disclosure. As shown in Figure 6, the second color filter 802 and the first improvement portion 111 can be an integral structure interconnected. The third color filter 803 and the second improvement portion 112 can be an integral structure interconnected. The first color filter 801 and the third improvement portion 113 can be an integral structure interconnected. The structure of the display substrate of this exemplary embodiment can be referred to the description of the foregoing embodiments, and will not be repeated here.

[0094] Figure 7 is a partial cross-sectional schematic diagram of a display substrate according to another embodiment of the present disclosure. As shown in Figure 7, the first color filter 801 and the first improvement portion 111 can be an integral structure connected to each other. The second color filter 802 and the second improvement portion 112 can be an integral structure connected to each other. The third color filter 803 and the third improvement portion 113 can be an integral structure connected to each other. The structure of the display substrate of this exemplary embodiment can be referred to the description of the foregoing embodiments, and will not be repeated here.

[0095] Figure 8 is a partial cross-sectional schematic diagram of a display substrate according to another embodiment of this disclosure. As shown in Figure 8, the first color filter 801, the first improvement portion 111, and the third improvement portion 113 can be an integral structure interconnected with each other. The third color filter 803 and the second improvement portion 112 can be an integral structure interconnected with each other. The structure of the display substrate of this exemplary embodiment can be referred to the description of the foregoing embodiments, and will not be repeated here.

[0096] Figure 9 is a partial cross-sectional schematic diagram of a display substrate according to another embodiment of the present disclosure. As shown in Figure 9, the first color filter 801 and the first improvement portion 111 can be an integral structure interconnected with each other. The third color filter 803, the second improvement portion 112, and the third improvement portion 113 can be an integral structure interconnected with each other. The structure of the display substrate of this exemplary embodiment can be referred to the description of the foregoing embodiments, and will not be repeated here.

[0097] Figure 10 is a partial cross-sectional schematic diagram of a display substrate according to another embodiment of the present disclosure. As shown in Figure 10, the second color filter 802, the second improvement portion 112, and the first improvement portion 111 can be an integral structure interconnected with each other. The third color filter 803 and the third improvement portion 113 can be an integral structure interconnected with each other. The structure of the display substrate of this exemplary embodiment can be referred to the description of the foregoing embodiments, and will not be repeated here.

[0098] Figure 11 is a partial cross-sectional schematic diagram of a display substrate according to another embodiment of the present disclosure. As shown in Figure 11, the second color filter 802 and the first improvement portion 111 can be an integral structure interconnected with each other. The third color filter 803, the second improvement portion 112, and the third improvement portion 113 can be an integral structure interconnected with each other. The structure of the display substrate of this exemplary embodiment can be referred to the description of the foregoing embodiments, and will not be repeated here.

[0099] Figure 12A is a partial cross-sectional schematic diagram of a display substrate according to an embodiment of the present disclosure. As shown in Figure 12A, the display device may include a display substrate, which may include a substrate 101 and a driving circuit layer 102, a light-emitting structure layer 103, an encapsulation layer 104, a touch structure layer 114, and a color filter structure layer 105 sequentially disposed on one side of the substrate 101. The touch structure layer 114 may include a plurality of touch electrodes, which may include at least driving (Tx) electrodes and sensing (Rx) electrodes. For example, the touch electrodes may be in the form of transparent conductive electrodes. For example, the touch electrodes may be in the form of a metal mesh, which is formed by interlacing multiple metal lines. The metal mesh includes multiple mesh patterns, and the mesh patterns may be polygons composed of multiple metal lines. Metal mesh touch electrodes have advantages such as low resistance, small thickness, and fast response speed.

[0100] The touch structure layer 114 may include a first conductive layer 114-1 and a second conductive layer 114-2 stacked sequentially. Multiple touch electrodes may be located in either the first conductive layer 114-1 or the second conductive layer 114-2. An insulating layer is disposed between the first conductive layer 114-1 and the second conductive layer 114-2. In one example, the second conductive layer 114-2 may be reused as a light-shielding layer, which can reduce the number of film layers, simplify the structure of the display substrate, and reduce manufacturing costs.

[0101] In an exemplary embodiment, as shown in FIG12A, the color filter structure layer 105 may include a light extraction layer 107, a color filter layer 108, a black matrix layer 109, and a protective layer 110 stacked sequentially. The color filter layer 108 may include at least a plurality of color filters (CFs), and the plurality of color filters may include at least a first color filter 801, a second color filter 802, and a third color filter 803. The black matrix layer 109 may include a plurality of black matrices (BMs).

[0102] The light extraction layer 107 may include multiple light extraction sections, which may form multiple light exit ports. The multiple light extraction sections may include at least a first light extraction section 701, a second light extraction section 702, and a third light extraction section 703. The orthographic projections of the first color filter 801 and the second color filter 802 onto the plane of the substrate 101 overlap with the orthographic projection of the first light extraction section 701 onto the plane of the substrate 101. The orthographic projections of the second color filter 802 and the third color filter 803 onto the plane of the substrate 101 overlap with the orthographic projection of the second light extraction section 702 onto the plane of the substrate 101. The orthographic projections of the third color filter 803 and the first color filter 801 onto the plane of the substrate 101 overlap with the orthographic projection of the third light extraction section 703 onto the plane of the substrate 101.

[0103] The plurality of black matrices may include at least a first black matrix 901, a second black matrix 902, and a third black matrix 903. The plurality of black matrices and the plurality of light extraction units may be arranged in pairs. The first black matrix 901 is arranged in pairs with the first light extraction unit 701, the second black matrix 902 is arranged in pairs with the second light extraction unit 702, and the third black matrix 903 is arranged in pairs with the third light extraction unit 703.

[0104] The color filter structure layer 105 may further include multiple improvement sections, which are respectively located between the black matrix and the light extraction sections arranged in pairs therewith. The improvement sections are configured to improve the flatness of the surface of the black matrix near the substrate 101, thereby improving problems such as black matrix peeling and breakage. In the embodiments of this disclosure, by providing the improvement sections, it is beneficial to ensure the uniformity of the multiple black matrices.

[0105] The plurality of improvement sections may include at least a first improvement section 111, a second improvement section 112, and a third improvement section 113. The first improvement section 111 is located between the first black matrix 901 and the first light extraction section 701, and the orthographic projection of the first black matrix 901 onto the plane of the substrate 101 lies within the orthographic projection of the first improvement section 111 onto the plane of the substrate 101. The orthographic projection of the first improvement section 111 onto the plane of the substrate 101 at least partially overlaps with the orthographic projection of the first light extraction section 701 onto the plane of the substrate 101. The second improvement section 112 is located between the second black matrix 902 and the second light extraction section 702, and the orthographic projection of the second black matrix 902 onto the plane of the substrate 101 lies within the orthographic projection of the second improvement section 112 onto the plane of the substrate 101. The orthographic projection of the second improvement section 112 onto the plane of the substrate 101 at least partially overlaps with the orthographic projection of the second light extraction section 702 onto the plane of the substrate 101. The third improvement section 113 is located between the third black matrix 903 and the third light extraction section 703, and the orthographic projection of the third black matrix 903 onto the plane of the substrate 101 is located within the orthographic projection of the third improvement section 113 onto the plane of the substrate 101. The orthographic projection of the third improvement section 113 onto the plane of the substrate 101 and the orthographic projection of the third light extraction section 703 onto the plane of the substrate 101 at least partially overlap.

[0106] As shown in FIG12A, each improvement section includes two or more stacked improvement layers. For example, each improvement section includes two stacked improvement layers. In embodiments of this disclosure, "two or more" includes two or more layers. The two stacked improvement layers are a first improvement layer 121 and a second improvement layer 122. The first improvement layer 121 is closer to the substrate 101 than the second improvement layer 122. The orthographic projections of the second improvement layer 122 and the first improvement layer 121 onto the plane of the substrate 101 overlap. As shown in FIG12A, the first improvement layer 121 includes a first portion 121-1 and a second portion 121-2, the surface of the first portion 121-1 away from the substrate 101 and the surface of the second portion 121-2 away from the substrate 101 can be substantially flush.

[0107] As shown in Figure 12A, the second improvement layer 122 and the third color filter 803 can be disposed on the same layer. One of the first part 121-1 and the second part 121-2 is disposed on the same layer as the first color filter 801, and the other of the first part 121-1 and the second part 121-2 is disposed on the same layer as the second color filter 802.

[0108] In an exemplary embodiment, as shown in FIG12A, the third color filter 803 and the second improvement layer 122 located on both sides of the third color filter 803 along the first direction are an integral structure connected to each other.

[0109] In an exemplary embodiment, the second improvement layer 122 may be co-layered with one of the first color filter 801, the second color filter 802, and the third color filter 803. The first portion 121-1 and the second portion 121-2 are respectively co-layered with two other color filters besides the one co-layered with the second improvement layer 122. For example, the second improvement layer 122 is co-layered with the first color filter 801, one of the first portion 121-1 and the second portion 121-2 is co-layered with the second color filter 802, and the other of the first portion 121-1 and the second portion 121-2 is co-layered with the third color filter 803. Alternatively, the second improvement layer 122 is co-layered with the second color filter 802, one of the first portion 121-1 and the second portion 121-2 is co-layered with the first color filter 801, and the other of the first portion 121-1 and the second portion 121-2 is co-layered with the third color filter 803.

[0110] In one exemplary embodiment, the thickness of the first color filter 801 can range from 2.0 micrometers to 5.0 micrometers. The thickness of the second color filter 802 can range from 2.0 micrometers to 5.0 micrometers. The thickness of the third color filter 803 can range from 2.0 micrometers to 5.0 micrometers. The direction of the thickness is perpendicular to the plane containing the substrate 101.

[0111] In one exemplary embodiment, the orthographic projections of the first improvement layer 121 and the light extraction portion onto the plane of the substrate 101 at least partially overlap to form an overlapping region, the dimension of which along a first direction is greater than or equal to 4.0 micrometers. The first direction is parallel to the plane of the substrate 101, and multiple sub-pixels within the same pixel unit are arranged sequentially along the first direction.

[0112] In an exemplary embodiment, the light-emitting structure layer 103 may further include a pixel definition layer 304, which may have multiple pixel openings. The multiple pixel openings are paired with multiple light-emitting devices. Light emitted by the first light-emitting device 301 can exit through its paired pixel opening. Light emitted by the second light-emitting device 302 can exit through its paired pixel opening. Light emitted by the third light-emitting device 303 can exit through its paired pixel opening. The pixel definition layer 304 may include multiple partitions 304a, which may form multiple pixel openings.

[0113] In an exemplary embodiment, the materials of the first conductive layer 114-1 and the second conductive layer 114-2 may be the same or different. The materials of the first conductive layer 114-1 and the second conductive layer 114-2 may include metallic materials or other conductive materials. For example, the metallic materials may include at least one of tungsten (W), molybdenum (Mo), cobalt (Co), titanium (Ti), copper (Cu), aluminum (Al), niobium (Nb), vanadium (V), hafnium (Hf), tantalum (Ta), chromium (Cr), zirconium (Zr), iron (Fe), ruthenium (Ru), osmium (Os), rhodium (Rh), iridium (Ir), nickel (Ni), palladium (Pa), platinum (Pt), silver (Ag), or gold (Au), or alloys of the above metals.

[0114] In an exemplary embodiment, the insulating layer may be made of silicon oxide (SiOx), silicon nitride (SiNx), silicon oxynitride (SiON), aluminum oxide (AlOx), hafnium oxide (HfOx), tantalum oxide (TaOx), etc., and the insulating layer may be a single layer, multiple layers, or a composite layer.

[0115] Figure 12B is a partially enlarged schematic diagram of the area marked B in Figure 12A. As shown in Figure 12B, multiple black matrices and multiple separators 304a are arranged in pairs. The orthographic projection of the black matrix onto the plane of the substrate 101 lies within the orthographic projection of the separator 304a that is paired with it onto the plane of the substrate 101. Each black matrix has at least one first edge 109a, and each separator 304a has at least one fourth edge 304b. The first edge 109a and the fourth edge 304b are separated by a distance d3 along a first direction, where d3 can range from 3.0 micrometers to 5.0 micrometers. The first direction is parallel to the plane of the substrate 101, and multiple sub-pixels within the same pixel unit are arranged sequentially along the first direction.

[0116] In one exemplary embodiment, as shown in FIG12B, a plurality of light extraction portions and a plurality of partition portions 304a are arranged in pairs. The orthographic projection of the light extraction portion onto the plane of the substrate 101 lies within the orthographic projection of the partition portion 304a arranged with it onto the plane of the substrate 101. The orthographic projection of the third edge 107d onto the plane of the substrate 101 lies within the orthographic projection of the partition portion 304a onto the plane of the substrate 101. Each light extraction portion has at least one third edge 107d. The third edge 107d and the fourth edge 304b have a distance d4 along a first direction, and the range of d4 can be from 0.0 micrometers to 4.0 micrometers. Alternatively, the orthographic projection of the fourth edge 304b onto the plane of the substrate 101 lies within the orthographic projection of the light extraction portion onto the plane of the substrate 101, and the third edge 107d and the fourth edge 304b have a distance d4 along the first direction, and the range of d4 can be from 0.0 micrometers to 2.0 micrometers.

[0117] In an exemplary embodiment, as shown in FIG12B, the first improvement layer 121 includes a first portion 121-1 and a second portion 121-2. A portion of the edge of the first portion 121-1 overlaps with a portion of the edge of the second portion 121-2, and the overlapping edge of the first portion 121-1 and the second portion 121-2 is referred to as the common edge. The orthographic projection of the common edge onto the plane of the substrate 101 is located within the orthographic projection of the separator 304a onto the plane of the substrate 101. The common edge and the fourth edge 304b have a distance d5 along the first direction, and the range of d5 can be from 0.0 micrometers to 6.0 micrometers.

[0118] Figure 13 is a partial cross-sectional schematic diagram of a display substrate according to an embodiment of the present disclosure. As shown in Figure 13, each improvement portion includes two or more improvement layers stacked together. For example, each improvement portion includes two improvement layers stacked together. The two stacked improvement layers are a first improvement layer 121 and a second improvement layer 122. The first improvement layer 121 is closer to the substrate 101 than the second improvement layer 122. For example, the orthographic projections of the second improvement layer 122 and the first improvement layer 121 onto the plane of the substrate 101 can overlap. As shown in Figure 13, the first improvement layer 121 includes a first portion 121-1 and a second portion 121-2. The surface of the first portion 121-1 away from the substrate 101 and the surface of the second portion 121-2 away from the substrate 101 can be substantially flush. As shown in Figure 13, a portion of the second improvement layer 122 is located between the first portion 121-1 and the second portion 121-2. The structure of the display substrate of this exemplary embodiment can be referred to the description of the foregoing embodiments, and will not be elaborated here.

[0119] In an exemplary embodiment, the second improvement layer 122 may include a first extension 122-1 and a second extension 122-2 connected to each other. The first extension 122-1 extends in a direction parallel to the plane of the substrate 101, and the second extension 122-2 extends toward the plane of the substrate 101. For example, the second extension 122-2 extends in a direction perpendicular to the plane of the substrate 101. For example, in a cross-section perpendicular to the plane of the substrate 101, the second improvement layer 122 may be T-shaped, with the first extension 122-1 being farther away from the substrate 101 than the second extension 122-2. The second extension 122-2 is located between the first portion 121-1 and the second portion 121-2, and a portion of the second extension 122-2 contacts the light extraction portion. In this embodiment of the present disclosure, by providing a first extension 122-1, a second extension 122-2, a first portion 121-1, and a second portion 121-2, the contact area between the first improvement layer 121 and the second improvement layer 122 can be increased, thereby improving the bonding performance.

[0120] In an exemplary embodiment, a gap along a first direction is provided between the first portion 121-1 and the second portion 121-2, and the gap may range from 2.0 micrometers to 5.0 micrometers.

[0121] Figure 14 is a partial cross-sectional schematic diagram of a display substrate according to another embodiment of the present disclosure. As shown in Figure 14, each improvement section includes two or more improvement layers stacked together. For example, each improvement section includes two improvement layers stacked together. The two stacked improvement layers are a first improvement layer 121 and a second improvement layer 122. The first improvement layer 121 is closer to the substrate 101 than the second improvement layer 122. For example, the orthographic projections of the second improvement layer 122 and the first improvement layer 121 onto the plane of the substrate 101 can overlap. As shown in Figure 14, the first improvement layer 121 includes a first portion 121-1 and a second portion 121-2. The surface of the first portion 121-1 away from the substrate 101 and the surface of the second portion 121-2 away from the substrate 101 can be substantially flush. For example, the first portion 121-1 and the second portion 121-2 can be an integral structure connected to each other. Alternatively, the first portion 121-1 and the second portion 121-2 can be disposed in the same layer as different color filters. The second improvement layer 122 can be disposed in the same layer as one of the first color filter 801, the second color filter 802, and the third color filter 803. The first portion 121-1 and the second portion 121-2 are respectively disposed in the same layer as two other color filters besides the one disposed in the same layer as the second improvement layer 122. For example, at least one first portion 121-1 and the second portion 121-2 of the first improvement layer 121 can be an integral structure interconnected. The structure of the display substrate of this exemplary embodiment can be referred to the description of the foregoing embodiments, and will not be repeated here.

[0122] Figure 15 is a partial cross-sectional schematic diagram of a display substrate according to another embodiment of the present disclosure. As shown in Figure 15, each improvement section includes two or more improvement layers stacked together. For example, each improvement section includes two improvement layers stacked together. The two stacked improvement layers are a first improvement layer 121 and a second improvement layer 122. The first improvement layer 121 is closer to the substrate 101 than the second improvement layer 122. For example, the orthographic projections of the second improvement layer 122 and the first improvement layer 121 onto the plane of the substrate 101 can overlap. The second improvement layer 122 can be disposed in the same layer as one of the first color filter 801, the second color filter 802, and the third color filter 803. For example, at least one first improvement layer 121 and the second improvement layer 122 can be an integral structure interconnected with each other. The structure of the display substrate of this exemplary embodiment can be referred to the description of the foregoing embodiments, and will not be elaborated here.

[0123] Figure 16 is a partial cross-sectional schematic diagram of a display substrate according to another embodiment of the present disclosure. As shown in Figure 16, each improvement section includes two or more improvement layers stacked together. For example, each improvement section includes three improvement layers stacked together. The three improvement layers are a first improvement layer 121, a second improvement layer 122, and a third improvement layer 123. The first improvement layer 121 is closer to the substrate 101 than the second improvement layer 122, and the first improvement layer 121, the second improvement layer 122, and the third improvement layer 123 are arranged sequentially in a direction away from the substrate 101. The first improvement layer 121 may be co-layered with one of the first color filter 801, the second color filter 802, and the third color filter 803. The second improvement layer 122 may be co-layered with one of the first color filter 801, the second color filter 802, and the third color filter 803. The third improvement layer 123 can be disposed in the same layer as one of the first color filter 801, the second color filter 802, and the third color filter 803. For example, the first improvement layer 121 and the second color filter 802 can be disposed in the same layer. The second improvement layer 122 and the first color filter 801 can be disposed in the same layer. The third improvement layer 123 and the third color filter 803 can be disposed in the same layer. Alternatively, the first improvement layer 121 and the first color filter 801 can be disposed in the same layer. The second improvement layer 122 and the second color filter 802 can be disposed in the same layer. The third improvement layer 123 and the third color filter 803 can be disposed in the same layer. Alternatively, the first improvement layer 121 and the third color filter 803 can be disposed in the same layer. The second improvement layer 122 and the first color filter 801 can be disposed in the same layer. The third improvement layer 123 and the second color filter 802 can be disposed in the same layer. The structure of the display substrate of this exemplary embodiment can be referred to the description of the foregoing embodiments, and will not be repeated here.

[0124] In an exemplary embodiment, each improvement section includes two or more improvement layers stacked together. The improvement layers in contact with the black matrix are disposed in the same layer. In this embodiment, by providing improvement sections, the flatness of the surface of the black matrix near the substrate can be improved. By providing multiple improvement sections, and by disposing of multiple improvement sections in the same layer as the film layers in contact with the black matrix, the uniformity of the morphology of multiple black matrices can be ensured, and the risk of dark-state effect deterioration can be reduced.

[0125] In some exemplary embodiments, the display substrate provided in the present disclosure can be applied to display devices with pixel driving circuits, such as OLED, quantum dot display (QLED), light-emitting diode display (Micro LED or Mini LED) or quantum dot light-emitting diode display (QDLED), etc., and the present disclosure does not limit it.

[0126] This disclosure also provides a display device, which includes the display substrate of any of the foregoing embodiments. The display device can be any product or component with display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator, and this disclosure is not limited thereto.

[0127] While the embodiments disclosed in this invention have been described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. It should be noted that the above embodiments or implementation methods are merely exemplary and not restrictive. Therefore, this disclosure is not limited to the content specifically shown and described herein. Various modifications, substitutions, or omissions can be made to the form and details of the implementation without departing from the scope of this disclosure.

Claims

1. A display substrate, comprising a substrate and a color filter structure layer located on the substrate; the color filter structure layer comprising: The light extraction layer includes multiple light extraction sections, and the multiple light extraction sections form multiple light exit ports; The color filter layer includes multiple color filters, with portions of two adjacent color filters located on the same side of the light extraction portion away from the substrate and both in contact with the surface of the light extraction portion away from the substrate. A black matrix layer is located on the side of the color filter layer away from the substrate and includes a plurality of black matrices; Multiple improvement sections are located on the side of the black matrix layer closest to the substrate, and the multiple improvement sections are arranged in pairs with the multiple black matrices. The orthographic projection of the black matrix onto the plane of the substrate is located within the orthographic projection of the improvement section paired with it onto the plane of the substrate. The surface of the improvement section away from the substrate is in contact with the surface of the black matrix close to the substrate, and the step difference between the surfaces of the improvement section and the black matrix in contact is less than or equal to 0.2 micrometers.

2. The display substrate as claimed in claim 1, wherein, At least one of the improvement sections is disposed in the same layer as the color filter.

3. The display substrate as described in claim 2, wherein, The plurality of light-emitting ports include a first light-emitting port, a second light-emitting port, and a third light-emitting port. The plurality of color filters include a first color filter, a second color filter, and a third color filter. The orthographic projection of the first color filter onto the plane of the substrate at least partially overlaps with the orthographic projection of the first light-emitting port onto the plane of the substrate. The orthographic projection of the second color filter onto the plane of the substrate at least partially overlaps with the orthographic projection of the second light-emitting port onto the plane of the substrate. The orthographic projection of the third color filter onto the plane of the substrate at least partially overlaps with the orthographic projection of the third light-emitting port onto the plane of the substrate. The plurality of improvement sections include a first improvement section, a second improvement section, and a third improvement section. The first improvement section is located between the first color filter and the second color filter. The second improvement section is located between the second color filter and the third color filter. The third improvement section is located between the third color filter and another first color filter. At least one of the first improvement section, the second improvement section, and the third improvement section is an integral structure interconnected with one of the first color filter, the second color filter, and the third color filter.

4. The display substrate as described in claim 3, wherein, The first improving part and the second color filter are an integrally connected structure; the second improving part and the third color filter are an integrally connected structure; and the third improving part and the first color filter are an integrally connected structure; or... The first improvement part and the first color filter are an integral structure connected to each other, the second improvement part and the second color filter are an integral structure connected to each other, and the third improvement part and the third color filter are an integral structure connected to each other.

5. The display substrate as claimed in claim 3, wherein, The first improvement section, the third improvement section, and the first color filter are an integrally connected structure; the second improvement section and the third color filter are an integrally connected structure; or... The second improvement section, the third improvement section, and the third color filter are an integral structure connected to each other; the first improvement section and the first color filter are an integral structure connected to each other; or, The first improvement section, the second improvement section, and the second color filter are an integrally connected structure; the third improvement section and the third color filter are an integrally connected structure; or... The second improvement section, the third improvement section, and the third color filter are an integral structure connected to each other, and the first improvement section and the second color filter are an integral structure connected to each other.

6. The display substrate as claimed in claim 2, wherein, The multiple improvement sections are arranged on the same floor.

7. The display substrate as claimed in claim 1, wherein, Each of the improvement sections includes two or more improvement layers stacked together; the multiple improvement layers that are in contact with the surfaces of the multiple black matrices near the substrate are disposed in the same layer.

8. The display substrate as claimed in claim 7, wherein, The plurality of improvement layers, which are in contact with the surface of the plurality of black matrices near the substrate, are disposed in the same layer as the color filter.

9. The display substrate as claimed in claim 8, wherein, Each of the improved portions includes a first improved layer and a second improved layer, wherein the second improved layer is farther away from the substrate than the first improved layer, and the surface of the second improved layer on the side farther away from the substrate is in contact with the surface of the black matrix on the side closer to the substrate; a plurality of second improved layers are disposed in the same layer.

10. The display substrate as claimed in claim 9, wherein, The first improvement layer includes a first portion and a second portion, and the orthographic projection of the second improvement layer onto the plane where the substrate is located includes the orthographic projections of the first portion and the second portion onto the plane where the substrate is located; the second improvement layer, the first portion, and the second portion are respectively disposed in the same layer as different color filters.

11. The display substrate as claimed in claim 10, wherein, The second improvement layer includes a first extension and a second extension connected to each other. The first extension extends in a direction parallel to the plane of the substrate, and the second extension extends toward the plane of the substrate. The first extension is farther away from the substrate than the second extension. The second extension is located between the first extension and the second extension and is in contact with the light extraction portion. Alternatively, the second improvement layer is located on the side of the first improvement layer that is farther away from the substrate.

12. The display substrate as claimed in claim 9, wherein, The first improvement layer includes a first portion and a second portion, and the orthographic projection of the second improvement layer onto the plane where the substrate is located includes the orthographic projections of the first portion and the second portion onto the plane where the substrate is located; at least the first portion and the second portion of the first improvement layer are an integral structure interconnected with each other.

13. The display substrate as claimed in claim 9, wherein, At least one of the improved parts, the first improved layer and the second improved layer, are an integral structure that is interconnected.

14. The display substrate as claimed in claim 8, wherein, Each of the improvement sections includes a first improvement layer, a second improvement layer, and a third improvement layer, and the first improvement layer, the second improvement layer, and the third improvement layer are respectively disposed in the same layer as different color filters.

15. A display device comprising a display substrate as described in any one of claims 1 to 14.

Images