Display substrate and display device

Abstract

The invention provides a display substrate and a display device. The display substrate comprises a substrate body, a flat layer, a first electrode, a first pixel defining layer, a second pixel defining layer, a color film layer and a shading layer, wherein the flat layer, the first electrode, the first pixel defining layer, the second pixel defining layer, the color film layer and the shading layer are arranged on the substrate body. The flat layer is provided with a first groove, at least part of the side face of the first groove is provided with a reflecting layer, and a second groove surrounding the light-emitting area of the sub-pixel is formed in the position, close to the side face, of the bottom face of the first groove. The first electrode covers the bottom face of the first groove and the bottom face and the side face of the second groove, and a first concave part is formed in the second groove. The first pixel defining layer is arranged in the first concave part, the first pixel defining layer comprises a black light absorbing material, and at least part of the reflecting layer arranged on the side face of the first groove is not shielded by the first pixel defining layer. The second pixel defining layer is provided with a first opening so as to expose at least a partial area of the first electrode.

Description

Technical Field

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

[0002] Organic electroluminescent display devices have many advantages such as self-luminescence, high brightness, high contrast, fast response speed, wide viewing angle, simple structure and flexible display, and are widely used in display products. In order to improve the light extraction efficiency of organic electroluminescent display devices, a reflective cup structure can be set in the display product. However, the inventors of the present application found in their research that the reflective cup structure does not improve the light extraction efficiency of the display substrate to a high degree. Summary of the invention

[0003] In view of this, some embodiments of the present disclosure provide a display substrate and a display device, which are beneficial to improving the light extraction efficiency of the display substrate.

[0004] In a first aspect, some embodiments of the present disclosure provide a display substrate, including a base substrate and a plurality of sub-pixels arranged on the base substrate. The display substrate further includes: a flat layer, arranged on one side of the base substrate, the flat layer is provided with a first groove, the side of the first groove is a slope structure, at least part of the area of ​​the side is provided with a reflective layer, and the bottom surface of the first groove is provided with a second groove surrounding the light-emitting area of ​​the sub-pixel; a first electrode, covering the bottom surface of the first groove and the bottom surface and side surface of the second groove, forming a first concave portion at the second groove; a first pixel defining layer, arranged in the first concave portion, the first pixel defining layer includes a black light-absorbing material, and at least part of the reflective layer arranged on the side of the first groove is not blocked by the first pixel defining layer; a second pixel defining layer, at least covering the reflective layer not blocked by the first pixel defining layer, the second pixel defining layer is provided with a first opening to expose at least part of the area of ​​the first electrode; a color filter layer and a light shielding layer, arranged on the side of the second pixel defining layer away from the base substrate, the light shielding layer is provided with a plurality of second openings, the color filter layer includes a color filter unit corresponding to the sub-pixel, and the color filter unit is arranged at the second opening.

[0005] In some embodiments, an orthographic projection of the first pixel defining layer on the base substrate at least partially overlaps with an orthographic projection of the first recess on the base substrate.

[0006] In some embodiments, the orthographic projection of the first pixel defining layer on the base substrate is within the orthographic projection range of the first recess on the base substrate. Alternatively, the edge of the first pixel defining layer close to the sub-pixel is substantially aligned with the edge of the first recess close to the sub-pixel, or is indented compared to the edge of the first recess close to the sub-pixel; the edge of the first pixel defining layer far from the sub-pixel exceeds the edge of the first recess far from the sub-pixel.

[0007] In some embodiments, along a direction perpendicular to the substrate, the distance between the top of the side of the first groove and the substrate is a first distance, the distance between the top of the first pixel defining layer and the substrate is a second distance, and the first distance is greater than the second distance.

[0008] In some embodiments, the orthographic projection of the pixel opening of the sub-pixel on the base substrate is a first projection area, the orthographic projection of the second opening on the base substrate is a second projection area, the first projection area is located within the second projection area, and there is a spacing area between the boundary of the first projection area and the boundary of the second projection area. The orthographic projection of the first pixel defining layer on the base substrate covers the spacing area.

[0009] In some embodiments, a width of the first concave portion in a direction toward the surrounded sub-pixel is 2-10 micrometers, and a depth of the first concave portion is at least greater than 0.5 micrometers.

[0010] In some embodiments, the second pixel defining layer includes: a first slope portion and a second slope portion facing the first opening, the top of the first slope portion is connected to the bottom of the second slope portion, the distance between the bottom of the first slope portion and the center of the first opening is smaller than the distance between the bottom of the second slope portion and the center, and the slope of the first slope portion is smaller than the slope of the second slope portion.

[0011] In some embodiments, the first slope portion is disposed on a side of the first pixel defining layer away from the base substrate, and the second slope portion is disposed on a side of the reflective layer away from the side surface.

[0012] In some embodiments, the sub-pixel includes: a light-emitting device and a pixel driving circuit for driving the light-emitting device to emit light, wherein the light-emitting device includes the first electrode, the light-emitting layer, and the second electrode stacked on the base substrate. The pixel driving circuit is arranged between the base substrate and the flat layer, and a via hole penetrating the flat layer is arranged on the bottom surface of the second groove, and the first electrode covered by the bottom surface of the second groove is electrically connected to the pixel driving circuit through the via hole.

[0013] In some embodiments, the display substrate further includes: a light-emitting layer and a second electrode stacked in sequence on the first electrode; an isolation structure is provided in the area between adjacent first grooves of the flat layer, and the light-emitting layers of adjacent sub-pixels are separated at the isolation structure; the flat layer is provided with a third groove, the second pixel defining layer covers the bottom and side surfaces of the third groove, a second recess is formed at the third groove, and the isolation structure is provided in the second recess.

[0014] In some embodiments, along a direction perpendicular to the substrate, a distance between a top end of the isolation structure and the substrate is greater than a distance between a top end of the second pixel defining layer and the substrate.

[0015] In some embodiments, the flat layer includes: a first sub-flat layer, which is arranged on one side of the base substrate; a second sub-flat layer, which is arranged on a side of the first sub-flat layer away from the base substrate, the second sub-flat layer is provided with a third opening, the third opening and the area of ​​the first sub-flat layer exposed at the third opening constitute the first groove, and the second groove is arranged on the surface of the first sub-flat layer away from the base substrate.

[0016] In some embodiments, the reflective layer is connected to the first electrode at the bottom end of the side surface of the first groove, and the reflective layer and the first electrode are arranged in the same layer.

[0017] In a second aspect, some embodiments of the present disclosure provide a display device comprising the display substrate described in the first aspect.

[0018] In the display substrate provided by some embodiments of the present disclosure, a reflective layer is arranged on at least part of the side surface of the first groove, and a reflective cup structure is formed together with the first electrode arranged on the bottom surface of the first groove. A second groove is arranged around the light-emitting area of ​​the sub-pixel, and the first electrode covers the bottom and side surfaces of the second groove to form a first recessed portion. A first pixel defining layer with light-absorbing properties is then arranged in the first recessed portion, and at least part of the reflective layer is not blocked by the first pixel defining layer. On the one hand, the reflective cup structure can reflect the light emitted by the sub-pixel, and on the other hand, the first pixel defining layer can block a part of the first electrode outside the light-emitting area, thereby reducing the reflection of the first electrode to the external ambient light, thereby achieving compatibility between the reflective cup structure and the COE (Color filter On Encapsulation) structure, which is beneficial to improving the light output efficiency and color gamut of the display substrate.

[0019] The above description is only an overview of the technical solution provided by the embodiment of the present disclosure. In order to more clearly understand the technical means of the embodiment of the present disclosure, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present disclosure more obvious and easy to understand, the specific implementation method of the embodiment of the present disclosure is listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present disclosure, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic structural diagram of a display substrate of the related art is shown;

[0022] Figure 2 A schematic plan view of a display substrate according to some embodiments of the present disclosure is shown;

[0023] Figure 3 A schematic plan view showing a portion of film layers of a display substrate according to some embodiments of the present disclosure;

[0024] Figure 4 A schematic diagram showing a stacked structure of a display substrate according to some embodiments of the present disclosure is shown;

[0025] Figure 5 Schematic diagrams showing the stacked structures of display substrates of other embodiments of the present disclosure;

[0026] Figure 6 Shows Figure 4 A partial dimension schematic diagram of a display substrate is shown;

[0027] Figure 7 Schematic diagrams showing the stacked structure of display substrates according to some other embodiments of the present disclosure;

[0028] Figure 8 A schematic structural diagram of a display device according to some embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0029] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0030] It should be noted that the “and / or” that appears in this article is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The term “at least one” includes one or more than one, and “more than two” includes two or more than two. “Include” or “comprising” and other similar words mean that the elements or objects that appear before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. “Up”, “down”, “left”, “right”, etc. are only used to indicate relative position relationships. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0031] As used herein, “about,” “roughly,” “substantially,” and “approximately” include the stated values ​​and averages that are within an acceptable range of variation for the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0032] It will be understood that when a layer or an element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present between the layer or element and the other layer or substrate.

[0033] Figure 1 FIG. 1 is a schematic diagram showing the structure of a display substrate in the related art. Figure 1 The display substrate includes a first flat layer PLN1, a second flat layer PLN2, an anode layer AND, a pixel defining layer PDL, and a light-emitting layer EL, which are stacked. The second flat layer PLN2 includes a slope structure, and the anode layer AND is arranged on the first flat layer PLN1 and covers the slope structure of the second flat layer PLN2. The pixel defining layer is arranged on the anode layer AND, and the pixel defining layer PDL includes a pixel opening, in which a portion of the anode layer AND is exposed. The anode layer AND can reflect light. Under the limitation of the slope structure of the second flat layer PLN2, the anode layer AND forms a shape of a reflective cup, the slope position is the "cup wall" of the reflective cup, and the flat part surrounded by the slope structure is the "cup bottom" of the reflective cup. When the light emitted by the light-emitting layer EL irradiates the reflective cup formed by the anode layer AND, the reflective cup can reflect the light back to the light-emitting side of the display substrate, thereby improving the light-emitting efficiency of the display device.

[0034] However, the inventors of the present application have found in their research that the reflective cup structure does not significantly improve the light output efficiency of the display substrate. One of the reasons for this is that since the reflective cup structure is needed to reflect the large-angle light emitted by the light-emitting layer, the pixel definition layer cannot use black light-shielding material, and is therefore not compatible with the COE (Color filter On Encapsulation) structure. At this point, in order to reduce the screen's reflection of ambient light and improve the color separation problem when the screen is off, the only solution is to attach a polarizer to the display substrate. In theory, a polarizer can only allow half of the light to pass through, which means that when the light passes through the polarizer, the brightness drops by more than 50%, which is not conducive to improving the light output efficiency of the display substrate.

[0035] Based on this, some embodiments of the present disclosure provide a display substrate that can achieve compatibility between the reflector cup structure and the COE structure, which is beneficial to improving the light extraction efficiency and color gamut of the display substrate. The display substrate provided by the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings.

[0036] The display substrate provided by some embodiments of the present disclosure includes a base substrate and a plurality of sub-pixels arranged on the base substrate. Each sub-pixel may include a light emitting device and a pixel driving circuit for driving the light emitting device to emit light.

[0037] For example, the light emitting device may be an OLED (Organic Light Emitting Diode) device or a QLED (Quantum Dot Light Emitting Diodes) device, or the like.

[0038] In the direction away from the substrate, the light-emitting device may include a first electrode, a light-emitting layer and a second electrode stacked in sequence. One of the first electrode and the second electrode serves as the anode of the light-emitting device, and the other serves as the cathode. In the embodiments of this article, the first electrode is used as the anode and the second electrode is used as the cathode. The light-emitting layer may at least include: a light-emitting material layer (EML), and the light-emitting material layer emits display light under the drive of the first electrode and the second electrode. In some embodiments, the light-emitting layer may also include any one or more of the following layers: 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), which can be arranged according to actual needs, and the present disclosure does not limit this.

[0039] In the case where the light-emitting device is a top-emitting light-emitting device, the first electrode is a reflective electrode. For example, the first electrode may be a composite structure formed by sequentially stacking a transparent conductive oxide film / a metal film / a transparent conductive oxide film. The material of the transparent conductive oxide film may be, for example, any one of ITO (Indium tin oxide) and IZO (Indium zinc oxide), and the material of the metal film may be, for example, any one or more of aluminum (Al), silver (Ag), titanium (Ti), molybdenum (Mo), etc. For another example, the first electrode may also be a single-layer structure, such as a single-layer structure The material may be any one of aluminum (Al), silver (Ag), titanium (Ti), and molybdenum (Mo).

[0040] For example, the second electrode may include a metal material, for example, any one of lithium (Li), aluminum (Al), magnesium (Mg), silver (Ag), or alloys of any of the above materials such as magnesium-silver alloy and aluminum-lithium alloy. The second electrodes of adjacent sub-pixels may be connected to each other to facilitate access to voltage signals.

[0041] The pixel driving circuit may include multiple electronic components such as transistors and capacitors. For example, the pixel driving circuit may include three transistors and one capacitor, forming a 3T1C (i.e., a driving transistor, two switching transistors and one capacitor). For another example, the pixel driving circuit may also include more than three transistors and at least one capacitor, such as a 4T1C (i.e., a driving transistor, three switching transistors and one capacitor), a 5T1C (i.e., a driving transistor, four switching transistors and one capacitor) or a 7T1C (i.e., a driving transistor, six switching transistors and one capacitor), etc. Among them, the transistor may be a thin film transistor (Thin Film Transistor, referred to as TFT), a field effect transistor (metal oxide semiconductor, referred to as MOS) or other switching devices with the same characteristics.

[0042] It can be understood that the transistor may include a control electrode, a first electrode, and a second electrode. The control electrode is the gate of the transistor, the first electrode is one of the source and drain of the transistor, and the second electrode is the other of the source and drain of the transistor. Since the source and drain of the transistor may be symmetrical in structure, the source and drain may be structurally indistinguishable, so the source of the transistor is called the first electrode, and may also be called the second electrode.

[0043] Figure 2 FIG. 1 is a schematic plan view of a display substrate according to some embodiments of the present disclosure. Figure 2The display substrate 10 may include: a display area DR and a non-display area NR. The display area DR is an area on the display substrate 10 for displaying images, and the non-display area NR is an area on the display substrate 10 other than the display area DR. The non-display area NR may be located on at least one side (e.g., one side, or multiple sides) of the display area DR. For example, the non-display area NR may be arranged around the display area DR.

[0044] The display region DR is provided with a plurality of pixel units P arranged in an array in a first direction and a second direction, the first direction and the second direction intersecting, such as being perpendicular to each other. For example, the plurality of pixel units P may be arranged in M ​​rows and N columns, where M and N are integers greater than or equal to 2. The first direction may be a pixel row direction (e.g. Figure 2 The second direction may be the direction of the pixel columns (eg, Figure 2 in the Y-axis direction).

[0045] Each pixel unit P includes a plurality of sub-pixels, each of which can display a single color, such as a red sub-pixel displays red, a green sub-pixel displays green, and a blue sub-pixel displays blue. The brightness (grayscale) of sub-pixels of different colors in each pixel unit P can be adjusted, and multiple colors can be displayed by color combination and superposition, thereby realizing full-color display of the display substrate 10.

[0046] like Figure 2 As shown, each pixel unit P may include a first sub-pixel p1, a second sub-pixel p2, and a third sub-pixel p3, and different sub-pixels have different luminous colors. For example, the first sub-pixel p1 may be a red sub-pixel, one of the second sub-pixel p2 and the third sub-pixel p3 may be a green sub-pixel, and the other may be a blue sub-pixel, such as the second sub-pixel p2 may be a green sub-pixel, and the third sub-pixel p3 may be a blue sub-pixel.

[0047] In some embodiments, sub-pixels of different colors may include light-emitting devices that emit light of different colors. For example, a red sub-pixel includes a light-emitting device that emits red light, a green sub-pixel includes a light-emitting device that emits green light, and a blue sub-pixel includes a light-emitting device that emits blue light. In other embodiments, sub-pixels of different colors may all include light-emitting devices that emit white light, and color display is achieved by combining the white light-emitting device with a color filter layer disposed above.

[0048] For example, Figure 2 As shown, the display substrate 10 further includes a plurality of scan lines GL and a plurality of data lines DL. The plurality of scan lines GL and the plurality of data lines DL cross each other to define a plurality of pixel areas distributed in an array in the display area DR.

[0049] For example, Figure 2As shown, the display substrate 10 may further include a scan drive circuit SC and a data drive circuit DC located in the non-display area NR. The scan drive circuit SC may be, for example, a gate drive circuit (such as a GOA drive circuit). The scan drive circuit SC is connected to the pixel drive circuit through the scan line GL to provide various scan signals, and the data drive circuit DC is connected to the pixel drive circuit through the data line DL to provide data signals. It should be noted that Figure 2 The positional relationship between the scan driving circuit SC and the data driving circuit DC, the scan lines GL and the data lines DL in the display substrate 10 shown in FIG. 1 is only an example, and the actual arrangement position can be designed as required. Figure 2 As shown, the scan driving circuit SC is disposed in the non-display area on one side of the display substrate 10 , or the scan driving circuit SC may be disposed in the non-display areas on two opposite sides of the display substrate 10 .

[0050] In some embodiments of the present disclosure, the display substrate includes a base substrate and a flat layer, a first electrode, a first pixel defining layer, a second pixel defining layer, a color filter layer and a light shielding layer arranged on one side of the base substrate. The flat layer is provided with a first groove, the side of the first groove is a slope structure, at least part of the area of ​​the side is provided with a reflective layer, and a second groove surrounding the light-emitting area of ​​the sub-pixel is provided at a position close to the side of the bottom surface of the first groove. The first electrode is arranged on the side of the flat layer away from the base substrate, the first electrode covers the bottom surface of the first groove and the bottom surface and side surface of the second groove, and forms a first concave portion at the second groove. The first pixel defining layer is arranged in the first concave portion, the first pixel defining layer includes a black light-absorbing material, and at least part of the reflective layer arranged on the side of the first groove is not blocked by the first pixel defining layer. The second pixel defining layer is arranged on the side of the first electrode away from the base substrate, at least covering the reflective layer not blocked by the first pixel defining layer. The second pixel defining layer is provided with a first opening to expose at least part of the area of ​​the first electrode. The color filter layer and the light shielding layer are arranged on the side of the second pixel defining layer away from the base substrate. The light shielding layer is provided with a plurality of second openings. The color filter layer includes color filter units corresponding to the sub-pixels. The color filter units are arranged at the second openings.

[0051] The reflective layer arranged on the side of the first groove and the first electrode arranged on the bottom of the first groove can form a reflective cup structure. The light-emitting layer of the sub-pixel emits at least a part of the large-angle light that was originally unable to be emitted. After being reflected by the reflective cup structure, it can be emitted from the side of the display substrate away from the base substrate, which is beneficial to improving the light output efficiency of the display substrate.

[0052] On the basis of realizing the reflective cup structure, a second groove is arranged around the light-emitting area of ​​the sub-pixel, and the first electrode covers the bottom and side surfaces of the second groove to form a first recessed portion, and then a first pixel defining layer with light-absorbing characteristics is arranged in the first recessed portion, and at least part of the reflective layer is not blocked by the first pixel defining layer. On the one hand, the reflective cup structure can reflect the light emitted by the sub-pixel, and on the other hand, the first pixel defining layer can block a portion of the first electrode outside the light-emitting area to reduce the reflection of the first electrode to the external ambient light, and then cooperate with the light-shielding layer to reduce the reflection of the ambient light by the entire display substrate, thereby achieving compatibility between the reflective cup structure and the COE structure, which is beneficial to improving the light output efficiency and color gamut of the display substrate.

[0053] Figure 3 A schematic plan view showing a portion of film layers of a display substrate according to some embodiments of the present disclosure is shown. Figure 4 A schematic diagram of the stacked structure of a display substrate in some embodiments of the present disclosure is shown. Figure 4 Can be along Figure 3 Schematic diagram of the cross section obtained by the AA section line. Figure 3 and Figure 4 The display substrate 10 may include: a base substrate 100, a driving circuit layer 110 arranged on the base substrate 100, a planar layer 120, a first electrode 151, a first pixel defining layer 130, a second pixel defining layer 140, a light emitting layer 152, a second electrode 153, an encapsulation layer 170, a color filter layer 182 and a light shielding layer 181.

[0054] The driving circuit layer 110 is at least used to form a pixel driving circuit for each sub-pixel. For example, the driving circuit layer 110 may at least include: at least one active layer, at least one gate metal layer, at least one source-drain metal layer, and an insulating layer separating these functional layers, which are sequentially stacked on the base substrate 100. These layers may form a plurality of pixel driving circuits.

[0055] The flat layer 120 is provided with a first groove 123, and the first groove 123 has a bottom surface and a side surface 1231. A second groove 124 is provided at a position of the bottom surface close to the side surface 1231. The second groove 124 is located outside the light-emitting area of ​​the sub-pixel, and its orthographic projection on the base substrate 100 is annular, and is provided around the light-emitting area of ​​the sub-pixel. It should be noted that Figure 3 The planar shapes of the first groove 123 and the second groove 124 shown in the figure are only for illustration and can be determined according to the needs of the product. For example, the planar shapes of the first groove 123 and the second groove 124 can be determined according to the shape of the sub-pixel, and the shape of the sub-pixel can be circular, elliptical, square, prism, pentagonal or hexagonal, etc., and the present disclosure does not limit this.

[0056] The stacked first electrode 151, the light-emitting layer 152 and the second electrode 153 form the light-emitting device of the above-mentioned sub-pixel. The first electrode 151 covers the bottom surface of the first groove 123 and the bottom surface and side surface of the second groove 124. The side surface 1231 of the first groove 123 is a slope structure, and the distance between the bottom end of the side surface 1231 and the center point of the first groove 123 is smaller than the distance between the top end of the side surface 1231 and the center point of the first groove 123. The side surface 1231 of the first groove 123 is covered with a reflective layer 160. Under the definition of the first groove 123, the reflective layer 160 and the first electrode 151 constitute a reflective cup structure to reflect the incident light to the side away from the base substrate 100 for emission.

[0057] like Figure 4 As shown, the reflective layer 160 may extend from the bottom end of the side surface 1231 of the first groove 123 to the top end, and even cover a portion of the flat layer 120 area between adjacent first grooves 123. The reflective layer 160 is connected to the first electrode 151 at the bottom end of the side surface 1231 of the first groove 123. In some embodiments, the reflective layer 160 may be disposed in the same layer as the first electrode 151. For example, the first electrode 151 may cover the bottom surface of the first groove 123 and wrap the slope surface of the flat layer 120, that is, the side surface 1231 of the first groove 123, to form a reflective cup structure to reflect the waveguide light in the second pixel defining layer 140 to the side away from the base substrate 100. For the sake of distinction, the first electrode 151 wrapping the side surface 1231 of the first groove 123 is referred to as the reflective layer 160.

[0058] In some embodiments, the connection line of the first electrode 151 is formed in the area between adjacent first grooves 123. Figure 4 As shown, a via hole 125 penetrating the flat layer 120 can be provided in the flat layer 120 region between adjacent first grooves 123 , so that the reflective layer 160 located on the top of the flat layer 120 is used as a connecting portion of the first electrode 151 to achieve electrical connection between the first electrode 151 and the pixel driving circuit.

[0059] Taking into account the dual limitations of the spacing width between adjacent sub-pixels (PDL Gap, affected by process capabilities) and the outward expansion width of the second opening compared to the pixel opening (BM Out, affecting optical effects), the design space between adjacent first grooves 123 is very small. In order to avoid the influence of the addition of the first pixel defining layer 130 on the device performance, in other embodiments, the connecting line of the first electrode 151 can be placed under the second groove 124. This can avoid mutual restrictions between these dimensions and ensure device performance.

[0060] Figure 5 Schematic diagrams showing the stacked structure of display substrates of other embodiments of the present disclosure are shown. Figure 5, a via 125 penetrating the flat layer 120 is provided on the bottom surface of the second groove 124, and the first electrode 151 covered by the bottom surface of the second groove 124 is electrically connected to the pixel driving circuit through the via 125. In other words, the portion of the first electrode 151 covered by the bottom surface of the second groove 124 is used as a connecting portion, and is electrically connected to the pixel driving circuit below by providing a via 125 penetrating the flat layer 120 at this position. In this way, when the reflective layer 160 and the first electrode 151 are provided on the same layer, it is beneficial to reduce the area of ​​the first electrode 151 pattern corresponding to each sub-pixel, thereby reducing the spacing distance between adjacent sub-pixels and improving PPI (Pixels Per Inch, pixel density unit). For example, Figure 5 The first electrode 151 in the planar layer 120 only extends to the edge region near the first groove 123 at the top of the slope, while Figure 4 The first electrode 151 in the structure needs to cover more area of ​​the top of the planar layer 120 to serve as a connection portion to be electrically connected to the pixel driving circuit below.

[0061] like Figure 4 As shown, in some embodiments, the flat layer 120 may be a double-layer structure, including a first sub-flat layer 121 and a second sub-flat layer 122. The first sub-flat layer 121 is disposed on one side of the base substrate 100. The second sub-flat layer 122 is disposed on the side of the first sub-flat layer 121 away from the base substrate 100. The orthographic projection of the second sub-flat layer 122 on the base substrate 100 is a mesh structure. The second sub-flat layer 122 is provided with a plurality of third openings, each of which corresponds to a sub-pixel. The side of the second sub-flat layer 122 facing the third opening is a slope structure, and the third opening and the area where the first sub-flat layer 121 is exposed at the third opening constitute a first groove 123 of the flat layer 120. The second groove 124 is disposed on the surface of the first sub-flat layer 121 away from the base substrate 100, and may be disposed close to the bottom end of the slope structure of the second flat layer 120 to ensure the pixel aperture ratio. In the direction perpendicular to the base substrate 100, the depth of the second groove 124 is less than the thickness of the first sub-flat layer 121.

[0062] Of course, in other embodiments, the flat layer 120 may also be a single-layer structure, and the first groove 123 is formed by etching the single-layer flat layer 120 according to the needs of the actual application scenario, and the present disclosure does not limit this.

[0063] like Figure 4As shown, along the direction perpendicular to the base substrate 100, the thickness of the first electrode 151 is less than the depth of the second groove 124, so that after the first electrode 151 covers the bottom and side surfaces of the second groove 124, a pit is formed at the second groove 124, which is called the first concave portion 1511. The first pixel defining layer 130 (also referred to as BPDL) is disposed in the first concave portion 1511. On the one hand, the slope angle is small, which can ensure that at least part of the reflective layer 160 disposed on the side of the first groove 123 is not blocked by the first pixel defining layer 130, thereby realizing the function of the reflective cup structure. On the other hand, the part of the first electrode 151 that forms the first concave portion 1511 can be blocked to reduce the reflection of the display substrate 10 to the external ambient light, thereby realizing the compatibility of the reflective cup structure and the COE structure.

[0064] Since the first pixel defining layer 130 is manufactured in the first concave portion 1511 , when the first concave portion 1511 is disposed around the light emitting region of the sub-pixel, the orthographic projection shape of the first pixel defining layer 130 on the base substrate 100 may also be a ring shape.

[0065] The orthographic projection of the first pixel defining layer 130 on the substrate 100 at least partially overlaps with the orthographic projection of the first recess 1511 on the substrate 100. In some embodiments, the orthographic projection of the first pixel defining layer 130 on the substrate 100 may be within the orthographic projection range of the first recess 1511 on the substrate 100.

[0066] In some embodiments, the range of the first pixel defining layer 130 may be substantially the same as the range of the first concave portion 1511, that is, the orthographic projection of the first pixel defining layer 130 on the base substrate 100 may substantially coincide with the orthographic projection of the first concave portion 1511 on the base substrate 100. In this way, the shielding of the reflective layer 160 can be reduced and the pixel aperture ratio can be ensured while minimizing the reflection of the external ambient light by the display substrate 10.

[0067] It should be noted that, in an ideal case, the first pixel defining layer 130 just fills the first concave portion 1511, and the orthographic projection of the first pixel defining layer 130 on the base substrate 100 completely overlaps with the orthographic projection of the first concave portion 1511 on the base substrate 100. Figure 5 In actual implementation, there may be a deviation between the edge of the first pixel defining layer 130 and the edge of the first concave portion 1511. For example, the edge of the first pixel defining layer 130 that is relatively close to the sub-pixel and / or the edge that is relatively far from the sub-pixel may slightly exceed the first concave portion 1511, or one edge may slightly exceed the first concave portion 1511, and the other edge may be slightly retracted compared to the edge of the first concave portion 1511.

[0068] In some embodiments, considering the manufacturing tolerance, the width of the first pixel defining layer 130 in the direction toward the sub-pixel surrounded by it may be slightly greater than the width of the first recess 1511. For example, the edge of the first pixel defining layer 130 close to the sub-pixel may be roughly aligned with the edge of the first recess 1511 close to the sub-pixel, or may be retracted compared to the edge of the first recess 1511 close to the sub-pixel; the edge of the first pixel defining layer 130 away from the sub-pixel may extend beyond the edge of the first recess 1511 away from the sub-pixel. Figure 4 As shown, the first pixel defining layer 130 is Figure 4 The right edge of the first pixel defining layer 130 is substantially aligned with the right edge of the first concave portion 1511, and the left edge of the first pixel defining layer 130 slightly exceeds the left edge of the first concave portion 1511. In this way, on the one hand, the first pixel defining layer 130 can ensure the anti-reflection effect of the external ambient light, and on the other hand, the first pixel defining layer 130 can be avoided as much as possible from blocking the light-emitting area of ​​the sub-pixel. Although the surface of the first pixel defining layer 130 away from the base substrate 100 will present a slope surface slightly exceeding the first concave portion 1511, the slope angle is small, and almost no waveguide light transmitted in the second pixel defining layer 140 will be absorbed.

[0069] like Figure 6 As shown, in some embodiments, along the direction perpendicular to the base substrate 100, the distance between the top of the side of the first groove 123 and the bottom of the base substrate 100 is a first distance H1, the distance between the top of the first pixel defining layer 130 and the bottom of the base substrate 100 is a second distance H2, and the first distance H1 is greater than the second distance H2. In this way, it can be ensured that at least part of the reflective layer 160 disposed on the side of the first groove 123 is not blocked by the first pixel defining layer 130, thereby ensuring the function of the reflective cup structure.

[0070] In some embodiments, the width of the first concave portion 1511 in the direction toward the sub-pixel surrounded can be 2 to 10 microns, for example, 2 microns, 4 microns, 6 microns, 8 microns or 10 microns, which is conducive to ensuring the width of the first pixel definition layer 130, thereby reducing the reflection of the external ambient light by the display substrate 10. In some embodiments, the depth of the first concave portion 1511 is at least greater than 0.5 microns, for example, it can be 0.8 microns, 1 micron or 1.2 microns, etc., which is set according to actual needs, which is conducive to reducing the shielding of the reflective layer 160 by the first pixel definition layer 130, that is, reducing the absorption of the first pixel definition layer 130 on the waveguide light transmitted in the second pixel definition layer 140.

[0071] like Figure 6As shown, the first pixel defining layer 130 is located in the pit of the first concave portion 1511 of the first electrode 151. The width of the first concave portion 1511 is the width of the bottom of the pit, denoted as d; the depth of the first concave portion 1511 is the depth of the pit, denoted as h.

[0072] In some embodiments, the second pixel defining layer 140 may cover the first pixel defining layer 130 and the reflective layer 160 not blocked by the first pixel defining layer 130, and the first opening 1401 is a pixel opening for defining the light emitting area of ​​the light emitting device included in the sub-pixel. Figure 4 As shown, the first concave portion 1511 , the first pixel defining layer 130 , and the edges of the second pixel defining layer 140 close to the sub-pixel may be substantially aligned.

[0073] like Figure 4 As shown, in some embodiments, the second pixel defining layer 140 may include a first slope portion 141 and a second slope portion 142 facing the first opening 1401, and the top of the first slope portion 141 is connected to the bottom of the second slope portion 142. The distance between the bottom end of the first slope portion 141 and the center of the first opening 1401 is smaller than the distance between the bottom end of the second slope portion 142 and the center of the first opening 1401. The slope of the first slope portion 141 is smaller than the slope of the second slope portion 142. At this time, the slope structure used to limit the light-emitting angle of the sub-pixel formed by the first pixel defining layer 130 and the second pixel defining layer 140 is stepped, and the slope of the first slope portion 141 relatively close to the edge of the sub-pixel is smaller, and the slope of the second slope portion 142 relatively far from the edge of the sub-pixel is larger. Then, most of the evaporation shielding area of ​​the slope structure will be on the first slope portion 141. Compared to Figure 1 The display substrate 10 ( Figure 1 The oblique line filling area indicated in the figure is the shielding area of ​​the pixel definition layer PDL for the evaporated material on the left, which easily leads to a thinner thickness of the light-emitting layer EL at the edge position). It can effectively reduce the shielding of the edge position of the sub-pixel, which is beneficial to reduce the thickness difference of the light-emitting layer 152 at the edge position and the middle position of the sub-pixel, and is beneficial to improve the luminous brightness of the sub-pixel.

[0074] In some embodiments, the first slope portion 141 may be disposed on a side of the first pixel defining layer 130 away from the base substrate 100 to wrap the first pixel defining layer 130 . The second slope portion 142 is disposed on a side of the reflective layer 160 away from the side surface to wrap the reflective layer 160 not blocked by the first pixel defining layer 130 .

[0075] For example, the second pixel defining layer 140 can be manufactured in two steps. The first step is to manufacture the portion above and near the first pixel defining layer 130. This portion is UV-cured to ensure that its slope is relatively small to reduce the evaporation shadow area (Shadow) at the edge of the sub-pixel. The second step is to manufacture the portion of the reflective layer 160 covering the side of the first groove 123. This portion is not UV-cured to make its slope larger to ensure its covering effect on the reflective layer 160.

[0076] like Figure 4 As shown, the light-emitting layer 152 and the second electrode 153 are sequentially stacked on the side of the second pixel defining layer 140 away from the base substrate 100. At least a portion of the light-emitting layer 152 is located in the first opening 1401 and is electrically connected to the first electrode 151 exposed in the first opening 1401, so that the light-emitting area of ​​the sub-pixel defined by the first opening 1401 emits light.

[0077] Figure 7 Schematic diagrams showing the stacked structure of display substrates of some other embodiments of the present disclosure are shown. Figure 7 In order to improve the crosstalk problem between sub-pixels, in some embodiments, an isolation structure 190 is provided in the region between adjacent first grooves 123 of the planar layer 120. The light-emitting layers 152 of adjacent sub-pixels are separated at the isolation structure 190, and the second electrodes 153 of adjacent sub-pixels are electrically connected at the isolation structure 190. For example, the isolation structure 190 may be a mesh structure, and the orthographic projection of the pixel opening of the sub-pixel on the base substrate 100 is within the orthographic projection range of the mesh hole on the base substrate 100.

[0078] It should be noted that the light-emitting layer 152 is isolated at the isolation structure 190, which can be understood as at least one functional film layer (such as a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting material layer, a hole blocking layer, an electron transport layer, and an electron injection layer) contained in the light-emitting layer 152 is isolated at the isolation structure. For example, all functional film layers contained in the light-emitting layer 152 can be isolated, or the hole injection layer and the hole transport layer can be isolated, which can reduce lateral carrier transmission and improve crosstalk between sub-pixels.

[0079] In some embodiments, the planar layer 120 is provided with a third groove, the second pixel defining layer 140 covers the bottom and side surfaces of the third groove, a second concave portion is formed at the third groove 126, and the isolation structure 190 is disposed in the second concave portion. This is conducive to reducing the influence of the isolation structure 190 on the thickness of the display substrate 10. Figure 7As shown, in the case where the flat layer 120 includes a first sub-flat layer 121 and a second sub-flat layer 122, a third groove 126 is arranged between adjacent third openings of the second sub-flat layer 122, the second pixel defining layer 140 covers the third groove 126, and a second recess 143 is formed at the third groove 126, and the isolation structure 190 is arranged at the bottom of the second recess 143.

[0080] In some embodiments, the isolation structure 190 may include a first isolation layer 191 and a second isolation layer 192 stacked in the second recess 143. In the direction toward the sub-pixel, the edge of the second isolation layer 192 protrudes from the edge of the first isolation layer 191 to form an undercut structure, so as to isolate the light-emitting layer 152 when the light-emitting layer 152 is subsequently evaporated.

[0081] For example, the first isolation layer 191 may be a silicon nitride layer, and the second isolation layer 192 may be a silicon oxide layer. The height of the first isolation layer 191 may be approximately equal to the total thickness of the organic film layer that needs to be isolated in the light-emitting layer 152, for example, it may be approximately equal to the thickness of the entire light-emitting layer 152. The thickness of the second isolation layer 192 is less than the thickness of the first isolation layer 191. This is conducive to ensuring the connectivity of the second electrode 153 of adjacent sub-pixels on the basis of isolating the light-emitting layer 152. It should be noted that in the case where the display substrate 10 includes sub-pixels of multiple different colors, the thickness of the light-emitting layer 152 of the sub-pixels of different colors may be slightly different, and the height of the first isolation layer 191 can be determined according to the thickness of the light-emitting layer 152 of the sub-pixel with a thicker light-emitting layer 152 among the adjacent sub-pixels, or, considering the convenience of manufacturing, the height of the first isolation layer 191 can also be determined according to the thickness of the light-emitting layer 152 of the sub-pixel with the thickest light-emitting layer 152 among the sub-pixels of different colors.

[0082] Of course, in other embodiments, other methods may be used to set the isolation structure 190 in the area between adjacent first grooves 123. For example, the second pixel defining layer 140 may be a multi-layer film structure, including a plurality of stacked inorganic film layers, and the above-mentioned isolation structure 190 is formed by etching the inorganic film layers in the second pixel defining layer 140.

[0083] In some embodiments, along the direction perpendicular to the base substrate 100, the distance between the top of the isolation structure 190 and the base substrate 100 may be greater than the distance between the top of the second pixel defining layer 140 and the base substrate 100. For example, the depth of the third groove 126 may be adjusted to adjust the second recess 143, so that the top of the isolation structure 190 is higher than the highest point of the second pixel defining layer 140, which acts as a spacer to prevent the fine metal mask (FMM) from being electrostatically adsorbed with the backplane in the subsequent evaporation process, and the FMM or the backplane may be damaged during peeling.

[0084] For example, with the bottom surface of the base substrate 100 as a reference surface, the height of the top of the isolation structure 190 is a first height, the height of the highest point of the second pixel defining layer 140 is a second height, and the first height is slightly greater than the second height. The height of the top of the isolation structure 190 may be the height of the surface of the second isolation layer 192 away from the first isolation layer 191.

[0085] In other embodiments, a convex structure is provided in the area between the adjacent third openings of the second sub-planar layer 122, so that the second pixel defining layer 140 covered thereon forms a convex portion at the position of the convex structure, which acts as a spacer. For example, a half-tone mask can be used to differentially expose the area on the second sub-planar layer 122 that will not be blocked by the reflective layer 160, so that a convex structure will be formed on the second sub-planar layer 122 due to the differential exposure in the subsequent process.

[0086] like Figure 4 As shown, the encapsulation layer 170 is disposed on the side of the second electrode 153 away from the base substrate 100, and is used to encapsulate the light-emitting device of each sub-pixel to prevent water and oxygen from corroding and damaging the device.

[0087] For example, the encapsulation layer 170 may include a first encapsulation layer 171, a second encapsulation layer 172, and a third encapsulation layer 173 which are stacked in sequence. The first encapsulation layer 171 and the third encapsulation layer 173 may be inorganic encapsulation layers, for example, inorganic materials such as nitrides, oxides, oxynitrides, nitrates, carbides, or any combination thereof may be used, and the preparation process may be a chemical vapor deposition (CVD) process. The second encapsulation layer 172 may be an organic encapsulation layer, for example, organic materials such as acrylic, hexamethyldisiloxane, polyacrylates, polycarbonates, polystyrene, etc. may be used, and the preparation process may be an inkjet printing (IJP) process.

[0088] like Figure 4As shown, the color filter layer 182 and the light shielding layer 181 are arranged on the side of the encapsulation layer 170 away from the base substrate 100. The light shielding layer 181 is provided with a plurality of second openings 1811, and the color filter layer 182 includes color filter units corresponding to the sub-pixels, and the color filter units are arranged at the second openings 1811. The light shielding layer 181 includes a black light absorbing material, and the light shielding layer 181 is combined with the first pixel defining layer 130 to achieve an anti-reflection effect on the external ambient light. For example, the light shielding layer 181 can also be called a black matrix (referred to as BM).

[0089] For example, when the display substrate 10 includes red sub-pixels, green sub-pixels and blue sub-pixels, the color filter layer 182 may include a red color filter unit corresponding to the red sub-pixel, a green color filter unit corresponding to the green sub-pixel, and a blue color filter unit corresponding to the blue sub-pixel.

[0090] It can be understood that in order to improve the light extraction efficiency, the second opening 1811 is usually expanded compared to the pixel opening of the sub-pixel (such as the first opening 1401 mentioned above), that is, the orthographic projection of the pixel opening on the substrate 100 is located within the orthographic projection of the second opening 1811 on the substrate 100, and there is a spacing area between the orthographic projection boundary of the pixel opening on the substrate 100 and the orthographic projection boundary of the second opening 1811 on the substrate 100.

[0091] In some embodiments, the orthographic projection of the first pixel defining layer 130 on the base substrate 100 may at least partially overlap with the above-mentioned spacing area. In order to achieve better coordination between the light shielding layer 181 and the first pixel defining layer 130, the orthographic projection of the first pixel defining layer 130 on the base substrate 100 may cover the above-mentioned spacing area, which is conducive to improving the anti-reflection effect of the external ambient light.

[0092] Of course, in other embodiments, the display substrate 10 may also include other film layer structures, such as including but not limited to a touch layer (not shown in the figure) for realizing a touch function and a cover layer (not shown in the figure) for protecting the display substrate 10, etc., which can be configured according to the needs of the actual application scenario, and the present disclosure does not impose any restrictions on this.

[0093] Figure 8 Schematic diagram of the structure of the display device of some embodiments of the present disclosure is shown. Figure 8Some embodiments of the present disclosure provide a display device 1000, including the display substrate 10 provided in any of the above embodiments. The display device 1000 can be, for example, a display, a television, a tablet computer, a laptop computer, a mobile phone, an augmented reality (AR) device, a virtual reality (VR) device, a wearable device, a digital photo frame, a navigator, or any other product or component with a display function. Of course, the display device 1000 provided in the embodiments of the present disclosure is not limited to the types listed above.

[0094] In the above description, the technical details such as the composition of each layer of the product are not described in detail. However, those skilled in the art should understand that various technical means can be used to form layers, regions, etc. of desired shapes. In addition, in order to form the same structure, those skilled in the art can also design methods that are not completely the same as the methods described above. Although each embodiment is described separately above, it does not mean that the measures in each embodiment cannot be used in combination to advantage.

[0095] It should be noted that the drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure, and other structures can refer to the general design. In the absence of conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0096] Although some embodiments of the present disclosure have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiment and all changes and modifications falling within the scope of the present disclosure.

Claims

1. A display substrate, characterized in that: The display substrate comprises a base substrate and a plurality of sub-pixels arranged on the base substrate, and the display substrate further comprises: A flat layer is arranged on one side of the base substrate, the flat layer is provided with a first groove, the side surface of the first groove is a slope structure, at least part of the side surface is provided with a reflective layer, and the bottom surface of the first groove is provided with a second groove surrounding the light-emitting area of ​​the sub-pixel; a first electrode covering a bottom surface of the first groove and a bottom surface and a side surface of the second groove, and forming a first concave portion at the second groove; A first pixel defining layer is disposed in the first concave portion, the first pixel defining layer comprises a black light absorbing material, and at least a portion of the reflective layer disposed on a side of the first groove is not blocked by the first pixel defining layer; a second pixel defining layer, at least covering the reflective layer not blocked by the first pixel defining layer, the second pixel defining layer being provided with a first opening to expose at least a portion of the first electrode; The color filter layer and the light shielding layer are arranged on the side of the second pixel defining layer away from the base substrate. The light shielding layer is provided with a plurality of second openings. The color filter layer includes color filter units corresponding to the sub-pixels. The color filter units are arranged at the second openings.

2. The display substrate according to claim 1, characterized in that: An orthographic projection of the first pixel defining layer on the base substrate at least partially overlaps with an orthographic projection of the first concave portion on the base substrate.

3. The display substrate according to claim 2, characterized in that: The orthographic projection of the first pixel defining layer on the base substrate is located within the orthographic projection range of the first concave portion on the base substrate; or An edge of the first pixel defining layer close to the sub-pixel is roughly aligned with an edge of the first recessed portion close to the sub-pixel, or is retracted compared to an edge of the first recessed portion close to the sub-pixel; an edge of the first pixel defining layer away from the sub-pixel exceeds an edge of the first recessed portion away from the sub-pixel.

4. The display substrate according to claim 1, characterized in that: Along a direction perpendicular to the base substrate, a distance between a top of a side surface of the first groove and the base substrate is a first distance, a distance between a top of the first pixel defining layer and the base substrate is a second distance, and the first distance is greater than the second distance.

5. The display substrate according to claim 1, characterized in that: The orthographic projection of the pixel opening of the sub-pixel on the base substrate is a first projection area, the orthographic projection of the second opening on the base substrate is a second projection area, the first projection area is located within the second projection area, and there is a spacing area between the boundary of the first projection area and the boundary of the second projection area; The orthographic projection of the first pixel defining layer on the base substrate covers the spacer area.

6. The display substrate according to claim 1, characterized in that: The width of the first concave portion in a direction toward the surrounded sub-pixel is 2-10 micrometers, and the depth of the first concave portion is at least greater than 0.5 micrometers.

7. The display substrate according to any one of claims 1 to 6, characterized in that: The second pixel defining layer includes: a first slope portion and a second slope portion facing the first opening, the top of the first slope portion is connected to the bottom of the second slope portion, the distance between the bottom of the first slope portion and the center of the first opening is smaller than the distance between the bottom of the second slope portion and the center, and the slope of the first slope portion is smaller than the slope of the second slope portion.

8. The display substrate according to claim 7, characterized in that: The first slope portion is disposed on a side of the first pixel defining layer away from the base substrate, and the second slope portion is disposed on a side of the reflective layer away from the side surface.

9. The display substrate according to any one of claims 1 to 6, characterized in that: The sub-pixel comprises: a light emitting device and a pixel driving circuit for driving the light emitting device to emit light, wherein the light emitting device comprises the first electrode, the light emitting layer and the second electrode stacked on the base substrate; The pixel driving circuit is arranged between the base substrate and the flat layer, a via hole penetrating the flat layer is arranged on the bottom surface of the second groove, and a first electrode covered by the bottom surface of the second groove is electrically connected to the pixel driving circuit through the via hole.

10. The display substrate according to any one of claims 1 to 6, characterized in that: Also includes: A light-emitting layer and a second electrode are sequentially stacked on the first electrode; An isolation structure is provided in a region between adjacent first grooves of the planar layer, and light-emitting layers of adjacent sub-pixels are isolated at the isolation structure; The planar layer is provided with a third groove, the second pixel defining layer covers the bottom surface and the side surface of the third groove, a second concave portion is formed at the third groove, and the isolation structure is arranged in the second concave portion.

11. The display substrate according to claim 10, characterized in that: Along a direction perpendicular to the base substrate, a distance between a top end of the isolation structure and the base substrate is greater than a distance between a top end of the second pixel defining layer and the base substrate.

12. The display substrate according to any one of claims 1 to 6, characterized in that: The planar layer comprises: A first sub-planarization layer is arranged on one side of the substrate; The second sub-planar layer is arranged on a side of the first sub-planar layer away from the base substrate, the second sub-planar layer is provided with a third opening, the third opening and the area of ​​the first sub-planar layer exposed at the third opening constitute the first groove, and the second groove is arranged on a surface of the first sub-planar layer away from the base substrate.

13. The display substrate according to any one of claims 1 to 6, characterized in that: The reflective layer is connected to the first electrode at the bottom end of the side surface of the first groove, and the reflective layer and the first electrode are arranged in the same layer.

14. A display device, characterized in that: include: The display substrate according to any one of claims 1 to 13.

Images