Display substrate, display panel and display device

Abstract

A display substrate, a display panel and a display device. The display substrate comprises a substrate, a plurality of sub-pixels and a pixel defining layer, the plurality of sub-pixels are located on the substrate, the sub-pixel comprises a light-emitting functional layer, and a first electrode and a second electrode located on both sides of the light-emitting functional layer in a direction perpendicular to the substrate, the first electrode is located between at least part of the light-emitting functional layer and the substrate, the pixel defining layer is located between the light-emitting functional layer and the substrate, the pixel defining layer comprises a plurality of pixel openings and a pixel defining portion located between adjacent pixel openings, the pixel opening exposes at least part of the first electrode, the light-emitting functional layer is in contact with the first electrode through the pixel opening, and the pixel defining portion has a slope angle between at least part of the surface of the first electrode away from the substrate and the first electrode, the slope angle is 25-35 degrees, so that the scratching of the light-emitting material in the pixel opening by the mask can be reduced, and the product failure rate caused by the scratching problem can be reduced.

Description

Technical Field

[0001] This disclosure relates to a display substrate, a display panel, and a display device. Background Technology

[0002] Organic light-emitting diode (OLED) displays are highly favored by users due to their rich colors, fast response time, and foldability. An OLED display with a tandem structure improves the lifespan and brightness of the light-emitting device and reduces power consumption by adding at least one light-emitting layer and a charge-generating layer. This meets users' demands for power consumption and lifespan in display devices and is expected to lead the trend of next-generation OLED technology and product development. Summary of the Invention

[0003] This disclosure provides a display substrate, a display panel, and a display device.

[0004] At least one embodiment of this disclosure provides a display substrate, including a substrate, a plurality of sub-pixels, and a pixel defining layer. The plurality of sub-pixels are located on the substrate. Each sub-pixel includes a light-emitting functional layer and a first electrode and a second electrode located on both sides of the light-emitting functional layer along a direction perpendicular to the substrate. The first electrode is located between at least a portion of the light-emitting functional layer and the substrate. The pixel defining layer is located between the light-emitting functional layer and the substrate. The pixel defining layer includes a plurality of pixel openings and a pixel defining portion located between adjacent pixel openings. The pixel openings expose at least a portion of the first electrode. The light-emitting functional layer is disposed in contact with the first electrode through the pixel openings. At least a portion of the surface of the pixel defining portion on the side of the first electrode away from the substrate has a slope angle with the first electrode, the slope angle being 25 to 35 degrees.

[0005] For example, in a display substrate provided according to at least one embodiment of the present disclosure, in a direction perpendicular to the substrate, the maximum distance between the surface of the pixel defining portion away from the substrate and the substrate is greater than the maximum distance between the surface of the light-emitting functional layer in the pixel opening away from the substrate and the substrate.

[0006] For example, according to at least one embodiment of the present disclosure, the sub-pixel includes a pixel driving circuit located between the first electrode and the substrate, the pixel driving circuit being electrically connected to the first electrode to drive the light-emitting functional layer to emit light, and the display substrate further includes at least one metal pattern located between at least a portion of the first electrode and the pixel driving circuit, each metal pattern including a plurality of metal structures, and in a direction perpendicular to the substrate, the first electrode of the sub-pixel and the pixel driving circuit of the sub-pixel both overlap with the metal structures.

[0007] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the plurality of sub-pixels include at least two different colors of sub-pixels, and the orthographic projection of the metal structure overlapping the first electrode of each color sub-pixel on the substrate falls completely into the orthographic projection of the pixel opening corresponding to the respective sub-pixel on the substrate.

[0008] For example, in a display substrate provided according to at least one embodiment of the present disclosure, there is a first distance between the orthographic projection of the metal structure overlapping the first electrode of at least one color sub-pixel on the substrate and the orthographic projection of the pixel defining portion surrounding the pixel opening corresponding to the sub-pixel on the substrate, the first distance being not less than 4 micrometers.

[0009] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the plurality of sub-pixels include at least two different colors of sub-pixels, and the metal structure overlapping the first electrode of the at least one color sub-pixel includes a portion located outside the pixel opening corresponding to the respective sub-pixel.

[0010] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the at least one color sub-pixel is a sub-pixel of one color, and the one color is green.

[0011] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the at least one layer of metal pattern includes a first metal pattern and a second metal pattern, the second metal pattern being located between the first metal pattern and at least a portion of the pixel driving circuit of the sub-pixel, and the metal structure of the first metal pattern and the metal structure of the second metal pattern at least partially overlapping in a direction perpendicular to the substrate.

[0012] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the pixel opening corresponding to the sub-pixel has a first orthographic projection on the substrate, and each of the metal structures of at least one of the first metal pattern and the second metal pattern has a second orthographic projection on the substrate, the second orthographic projection falling into the first orthographic projection, and the area of ​​the second orthographic projection being smaller than the area of ​​the first orthographic projection.

[0013] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the pixel opening corresponding to the sub-pixel has a first orthographic projection on the substrate, the orthographic projection of the metal structure in the first metal pattern on the substrate falls into the first orthographic projection, and the orthographic projection of the metal structure in the second metal pattern on the substrate includes a portion located outside the first orthographic projection.

[0014] For example, according to at least one embodiment of the display substrate provided in this disclosure, the sub-pixel includes a pixel driving circuit located between the first electrode and the substrate, the pixel driving circuit being electrically connected to the first electrode to drive the light-emitting functional layer to emit light, the display substrate further includes a metal pattern located between at least a portion of the first electrode and the pixel driving circuit, at least one layer of the metal pattern including a first metal portion and a second metal portion corresponding to each sub-pixel, in a direction perpendicular to the substrate, the first metal portion corresponding to the sub-pixel overlaps with the first electrode of the sub-pixel, the second metal portion corresponding to the sub-pixel overlaps with the pixel defining portion surrounding the pixel opening of the sub-pixel, the first metal portion and the second metal portion corresponding to the sub-pixel are spaced apart, and in a direction perpendicular to the substrate, the edge of the pixel defining portion surrounding the pixel opening of the sub-pixel near the first metal portion does not overlap with the metal pattern.

[0015] For example, according to at least one embodiment of the present disclosure, the display substrate further includes an inorganic layer and an organic layer. The inorganic layer is located between the first electrode of the sub-pixel and the substrate. The inorganic layer includes a plurality of inorganic structures, at least a portion of which is located in the pixel opening corresponding to the sub-pixel. The organic layer is located on the side of the inorganic layer near the substrate and in contact with the inorganic layer. The organic layer includes a plurality of organic structures. The inorganic structures include protrusions that protrude relative to the edges of the organic structures. The light-emitting functional layer includes a plurality of film layers. At least a portion of the sub-pixels have a defined opening between adjacent sub-pixels. The portion of the protrusion of the inorganic structure exposed by the defined opening serves as a partition. The partition is configured to partition at least one of the light-emitting functional layers.

[0016] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the plurality of sub-pixels include sub-pixels of at least two different colors, and the protrusion of the inorganic structure corresponding to each of the sub-pixels of at least one color is covered by the pixel defining portion.

[0017] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the edge of the protrusion covered by the pixel defining portion has a second distance between it and the pixel opening corresponding to the corresponding sub-pixel, the second distance being not less than 1 / 2 of the size of the pixel defining portion in the direction of the second distance.

[0018] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the second distance is 1 to 3 micrometers.

[0019] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the at least two different colored sub-pixels include a first sub-pixel and a second sub-pixel, the area of ​​the light-emitting region of the first sub-pixel is smaller than the area of ​​the light-emitting region of the second sub-pixel, and the protrusion of the inorganic structure corresponding to the first sub-pixel is covered by the pixel defining portion.

[0020] For example, according to at least one embodiment of the display substrate provided in this disclosure, each of the sub-pixels includes a pixel driving circuit located between the first electrode and the substrate. The pixel driving circuit is electrically connected to the first electrode to drive the light-emitting functional layer to emit light. The display substrate further includes at least one layer of metal pattern located between at least a portion of the first electrode and the pixel driving circuit. Each layer of the metal pattern includes a plurality of metal structures. In a direction perpendicular to the substrate, the first electrode of the sub-pixel and the pixel driving circuit of the sub-pixel overlap with the metal structures. The protrusion of the inorganic structure overlapping with the first electrode of each of the sub-pixels of a sub-pixel of a certain color is covered by the pixel defining portion, and the metal structure overlapping with the first electrode of the sub-pixel of that color includes a portion located outside the pixel opening corresponding to the respective sub-pixel.

[0021] For example, according to at least one embodiment of the present disclosure, the display substrate further includes an inorganic layer and an inorganic layer, the inorganic layer being located on the substrate, the inorganic layer including a plurality of first partition structures; an organic layer being located on the side of the inorganic layer near the substrate and in contact with the inorganic layer, the organic layer including a plurality of second partition structures, wherein the first partition structures and the second partition structures are both located between adjacent sub-pixels, the first partition structure including a protrusion protruding relative to the edge of the second partition structure, the first partition structure and the second partition structure being spaced apart from the pixel defining portion, the light-emitting functional layer including a plurality of film layers, the pixel defining layer including a plurality of defining openings, each of the defining openings being located between adjacent sub-pixels, the protrusion of the first partition structure being exposed by the defining opening to isolate at least one of the light-emitting functional layers.

[0022] For example, in a display substrate provided according to at least one embodiment of the present disclosure, a pixel defining material is exposed through a mask to form the pixel defining layer. The mask includes a plurality of mask openings. After the pixel defining material is exposed, there is a third distance between the orthographic projection of the mask openings on the substrate and the orthographic projection of the pixel openings in the pixel defining layer on the substrate. The third distance is not greater than 2 micrometers.

[0023] For example, in a display substrate provided according to at least one embodiment of the present disclosure, the third distance is 1 micrometer to 1.5 micrometers.

[0024] For example, according to at least one embodiment of the present disclosure, the display substrate further includes a plurality of support structures located on the substrate, and the support structures are located on one side of the pixel opening corresponding to the sub-pixel, wherein at least a portion of the surface of the support structure away from the substrate is further away from the substrate than the pixel defining portion, and in a direction perpendicular to the substrate, the difference between the maximum size of the support structure and the maximum size of the pixel defining portion is at least 0.5 micrometers.

[0025] Another embodiment of this disclosure provides a display panel including any of the above-described display substrates.

[0026] Another embodiment of this disclosure provides a display device including any of the above-described display substrates. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this disclosure and are not intended to limit this disclosure.

[0028] Figure 1 This is a partial cross-sectional schematic diagram of a display substrate.

[0029] Figure 2 This is a partial planar structure diagram of a display substrate provided in at least one embodiment of the present disclosure.

[0030] Figure 3 For along Figure 2 A schematic diagram of the local cross-sectional structure intercepted by line A-A'.

[0031] Figure 4 A partial cross-sectional schematic diagram of another display substrate provided for at least one embodiment of the present disclosure.

[0032] Figures 5-8 A partial cross-sectional schematic diagram of different display substrates provided for at least one embodiment of this disclosure.

[0033] Figure 9 This is a partial planar structure schematic diagram of another display substrate provided for at least one embodiment of the present disclosure.

[0034] Figure 10 For along Figure 9 A schematic diagram of the local cross-section structure intercepted by line B-B'.

[0035] Figure 11 This is a partial planar structure schematic diagram of another display substrate provided for at least one embodiment of the present disclosure.

[0036] Figure 12 for Figure 11 The diagram shown illustrates the mask setup process for the display substrate during manufacturing.

[0037] Figure 13 This is a schematic diagram illustrating the fabrication process of a pixel-defining layer in a display substrate.

[0038] Figure 14 The optical path diagram of the material being exposed through a mask to define the pixel.

[0039] Figure 15 A planar schematic diagram of the pixel-defining layer obtained after exposure processing of the pixel-defining material.

[0040] Figure 16 This is a schematic diagram illustrating the fabrication process of a pixel-defining layer in a display substrate, provided for at least one embodiment of the present disclosure.

[0041] Figure 17 This is an optical path diagram of a pixel-defined material being exposed via a mask in at least one embodiment of this disclosure.

[0042] Figure 18 A schematic block diagram of a display device provided for at least one embodiment of the present disclosure. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Based on the described embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0044] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that an element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Features such as “parallel,” “perpendicular,” and “identical” used in embodiments of this disclosure include features in the strict sense of “parallel,” “perpendicular,” and “identical,” as well as cases where “substantially parallel,” “substantially perpendicular,” and “substantially identical” include a certain degree of error, taking into account measurement and errors associated with the measurement of a particular quantity (e.g., limitations of the measurement system), indicating a range of acceptable deviations for a particular value as determined by one of ordinary skill in the art. For example, “substantially” can mean within one or more standard deviations, or within 10% or 5% of said value. Unless otherwise specified in the following embodiments of this disclosure, the quantity of a component means that the component may be one or more, or can be understood as at least one. “At least one” means one or more, and “more” means at least two.

[0045] Currently, tandem technology primarily involves stacking and connecting the light-emitting layers of two sub-pixels in series, with a charge-generating layer, such as a P-type doped charge-generating layer (P-CGL) and an N-type doped charge-generating layer (N-CGL), between the stacked light-emitting layers. For example, a tandem device can replace one light-emitting layer in an OLED display panel with two light-emitting layers. Compared to a display substrate without a tandem device, the two light-emitting layers in a tandem device are connected in series, enabling dual light-emitting devices. Under the same luminous intensity, this significantly reduces the luminous current of the light-emitting device, improves the lifetime of the organic light-emitting element, and reduces power consumption.

[0046] Figure 1 This is a partial cross-sectional schematic diagram of a display substrate.

[0047] In their research, the inventors of this application discovered that the charge generation layer in a tandem device has high conductivity, and since the charge generation layers of two adjacent sub-pixels are continuous films, lateral charge migration can easily occur, leading to crosstalk between adjacent sub-pixels and causing color shift in the display substrate. To address this, some products use isolation pillars between adjacent sub-pixels to isolate the light-emitting functional layers, thereby reducing the risk of crosstalk. For example, Reference... Figure 1The mask 11 used to fabricate the emitting functional layer 130 of the tandem device (including a first emitting layer 131, a charge generation layer 133, and a second emitting layer 132) may scratch the emitting material of the emitting functional layer 130 within the emitting region of a sub-pixel (see scratch region A1), potentially causing a dual-layer OLED device to be scratched into a single-layer OLED device. This results in scratched bright spots in low grayscale, low brightness display modes and scratched dark spots in high grayscale, high brightness display modes, leading to reduced product yield and significantly increased production costs for tandem devices.

[0048] In response, analysis of scratch-type bright spots (e.g., bright spots caused by the aforementioned scratching phenomenon) revealed that the main reason for the scratching of the light-emitting material within the light-emitting region of the sub-pixel by the fabrication mask of the light-emitting functional layer is that the slope angle of the sidewall of the pixel-defining portion surrounding the light-emitting region of the sub-pixel is insufficient (e.g., less than 25 degrees), resulting in insufficient support for the fabrication mask. Furthermore, when a support structure for supporting the mask is provided in the display substrate, insufficient density and height of the support structure also exacerbate the scratching problem.

[0049] At least one embodiment of this disclosure provides a display substrate, including a substrate, a plurality of sub-pixels, and a pixel defining layer. The plurality of sub-pixels are located on the substrate, and each sub-pixel includes a light-emitting functional layer, and a first electrode and a second electrode located on both sides of the light-emitting functional layer along a direction perpendicular to the substrate. The first electrode is located between at least a portion of the light-emitting functional layer and the substrate. The pixel defining layer is located between the light-emitting functional layer and the substrate. The pixel defining layer includes a plurality of pixel openings and a pixel defining portion located between adjacent pixel openings. The pixel openings expose at least a portion of the first electrode. The light-emitting functional layer is disposed in contact with the first electrode through the pixel openings. At least a portion of the surface of the pixel defining portion on the side of the first electrode away from the substrate has a slope angle with the first electrode, and the slope angle is 25 to 35 degrees.

[0050] In at least one embodiment of the display substrate provided in this disclosure, since the slope angle between at least a portion of the surface of the pixel defining portion on the side of the first electrode away from the substrate and the first electrode is not less than 25 degrees and is 25 to 35 degrees, the pixel defining portion can effectively support the fabrication mask of the light-emitting functional layer, thereby reducing the risk of the fabrication mask contacting and scraping the light-emitting material located in the pixel opening, and thus significantly reducing the product defect rate caused by the scraping problem.

[0051] At least one embodiment of this disclosure provides a display panel, which includes a display substrate provided in any embodiment of this disclosure.

[0052] Another embodiment of this disclosure provides a display device, which includes the display substrate provided in any embodiment of this disclosure.

[0053] The display substrate, display panel, and display device provided in the embodiments of this disclosure are described below with reference to the accompanying drawings.

[0054] Figure 2 This is a partial planar structure schematic diagram of a display substrate provided in at least one embodiment of the present disclosure; Figure 3 For along Figure 2 A schematic diagram of the local cross-sectional structure intercepted by line A-A'.

[0055] like Figure 2 and Figure 3 As shown, the display substrate includes a substrate BS, a plurality of sub-pixels 10, and a pixel defining layer 200. The plurality of sub-pixels 10 are located on the substrate BS, and each sub-pixel 10 includes a light-emitting functional layer 130, and extends along a direction perpendicular to the substrate BS (i.e., as shown in the image). Figure 3 The first electrode 110 and the second electrode 120 (shown in the Z direction) are located on both sides of the light-emitting functional layer 130, with the first electrode 110 located between at least a portion of the light-emitting functional layer 130 and the substrate BS.

[0056] For example, such as Figure 3 As shown, the light-emitting functional layer 130 includes multiple film layers. For example, the light-emitting functional layer 130 may include a light-emitting layer for emitting light and a charge-generating layer 133. The charge-generating layer 133 has strong conductivity, which enables the light-emitting functional layer 130 to have advantages such as long lifespan, low power consumption, and high brightness. For example, the light-emitting functional layer 130 can be a film layer in an organic light-emitting element. For example, the light-emitting functional layer 130 may include a first light-emitting layer (EML) 131, a charge-generating layer (CGL) 133, and a second light-emitting layer (EML) 132 stacked together, with the charge-generating layer 133 located between the first light-emitting layer 131 and the second light-emitting layer 132. It should be noted that... Figure 3 The light-emitting functional layer 130 shown may also include other film layers, such as a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL), etc., and the embodiments disclosed herein are not limited thereto. For example, the hole injection layer, hole transport layer, electron transport layer, electron injection layer, charge generation layer 133, and second electrode 120 are all common film layers of multiple sub-pixels 10, and can be referred to as common layers. Furthermore, Figure 3 The thicknesses of each film layer shown are for illustrative purposes only and do not represent the actual dimensions.

[0057] For example, such as Figure 3As shown, sub-pixel 10 may include a tandem light-emitting element, such as a tandem OLED, but embodiments of this disclosure are not limited thereto.

[0058] For example, such as Figure 3 As shown, the side of the first electrode 110 facing the substrate BS is also provided with other structures 01, such as a pixel driving circuit 240 electrically connected to the first electrode 110 of the sub-pixel 10, signal lines, and various insulating layers, etc., for example, it may include a passivation layer, a buffer layer, a gate insulating layer, an interlayer insulating layer, etc., and the embodiments of this disclosure do not limit this.

[0059] like Figure 2 and Figure 3 As shown, at least a portion of the pixel defining layer 200 is located between the light-emitting functional layer 130 and the substrate BS. The pixel defining layer 200 includes a plurality of pixel openings 210 and pixel defining portions 230 located between adjacent pixel openings 210. The pixel openings 210 expose at least a portion of the first electrode 110 to define the light-emitting area of ​​the sub-pixel 10, and the light-emitting functional layer 130 is disposed in contact with the first electrode 110 through the pixel openings 210. For example, the first electrode 110 and the second electrode 120 located on both sides of the light-emitting functional layer 130 can drive the light-emitting functional layer 130 located between them to emit light. For example, the light-emitting area of ​​the sub-pixel 10 refers to the area where the sub-pixel 10 effectively emits light, and the shape of the light-emitting area refers to a two-dimensional shape. For example, the shape of the light-emitting area may be the same as the shape of the orthographic projection of the portion of the first electrode 110 exposed by the pixel openings 210 onto the substrate BS.

[0060] like Figure 3 As shown, at least a portion of the surface of the pixel defining portion 230 located on the side of the first electrode 110 away from the substrate BS has a slope angle μ with the first electrode 110, and the slope angle μ is 25 to 35 degrees. For example, the slope angle μ can be the angle between the side of the pixel defining portion 230 near the pixel opening 210 corresponding to the sub-pixel 10 away from the pixel opening 210 and the surface of the first electrode 110 away from the substrate BS. For example, the slope angle μ can be the angle between the cross-section of the portion of the pixel defining portion 230 near the pixel opening 210 of the sub-pixel 10 and the plane parallel to the substrate BS, thereby facilitating the effective support of the pixel defining portion for the fabrication mask of the light-emitting element. For example, the slope angle μ can be 25 to 35 degrees, such as at least one of 26 to 30 degrees, 28 to 32 degrees, and 30 to 35 degrees, or it can be other angles within the range of 25 to 35 degrees, which is not limited in the embodiments of this disclosure.

[0061] In at least one embodiment of the display substrate provided in this disclosure, since the slope angle between at least a portion of the surface of the pixel defining portion located on the side of the first electrode away from the substrate and the first electrode is not less than 25 degrees and is 25 to 35 degrees, the pixel defining portion can effectively support the fabrication mask of the light-emitting functional layer. This reduces the risk of the fabrication mask contacting and scraping the light-emitting material located in the light-emitting area of ​​the sub-pixel, and significantly reduces the product defect rate caused by the scraping problem (for example, the product defect rate can be reduced from 80% to less than 5%).

[0062] For example, such as Figure 3 As shown, in the Z direction, the maximum distance between the surface of the pixel defining portion 230 away from the substrate BS and the substrate BS is greater than the maximum distance between the surface of the light-emitting functional layer 130 in the pixel opening 210 away from the substrate BS and the substrate BS. For example, at least a portion of the surface of the pixel defining portion 230 away from the substrate BS is further away from the substrate BS than the light-emitting functional layer 130. For example, the surface of the pixel defining portion 230 away from the substrate BS includes a portion located on the side of the light-emitting functional layer 130 away from the substrate BS (i.e., a portion extending beyond the light-emitting functional layer), and in the Z direction, the maximum distance between this portion and the light-emitting functional layer 130 can be 1 / 3 to 2 / 3 of the maximum size of the pixel defining portion 230, such as 1 / 2, etc., and the embodiments of this disclosure are not limited in this respect.

[0063] This configuration allows at least a portion of the pixel-defined portion to protrude relative to the light-emitting functional layer, thereby enabling the sub-pixel to have a good light emission angle and the pixel-defined portion to have good support for the fabrication mask of the light-emitting functional layer.

[0064] For example, such as Figure 3 As shown, the display substrate includes an inorganic layer 410. The inorganic layer 410 is located between the first electrode 110 of the sub-pixel 10 and the substrate BS. The inorganic layer 410 includes a plurality of inorganic structures 405, and at least a portion of the inorganic structures 405 is located in the pixel opening 210 corresponding to the sub-pixel 10. For example, the orthographic projection of the pixel opening 210 on the substrate BS falls within the orthographic projection of the inorganic structure 405 on the substrate BS. For example, the first electrode 110 of the sub-pixel 110 is located on the inorganic structure 405, and the inorganic structure 405 can ensure good flatness of the first electrode 110. For example, the inorganic layer 410 can be a single-piece structure or a separate structure; the embodiments of this disclosure do not limit this.

[0065] For example, such as Figure 3As shown, the display substrate also includes an organic layer 420. The organic layer 420 is located on the side of the inorganic layer 410 closest to the substrate BS and is in contact with the inorganic layer 410. The organic layer 420 includes a plurality of organic structures 415, and the inorganic structure 405 includes a protrusion 4051 protruding relative to the edge of the organic structure 415. For example, the organic layer 420 also includes a flat portion 425 located between the organic structure 415 and the substrate BS, and this flat portion 425 is connected to the plurality of organic structures 415. For example, the flat portion 425 and the plurality of organic structures 415 are an integral structure. For example, the plurality of organic structures 415 in the organic layer 420 are formed during the fabrication of the inorganic structure 405. For example, during the process of patterning the inorganic structure 405 using an etching solution, a portion of the organic layer 420 overlapping with the inorganic layer 410 is etched together, and the inorganic structure 405 is formed with a protrusion 4051 protruding relative to the edge of the organic structure 415.

[0066] For example, such as Figure 3 As shown, the pixel defining portion 230 also includes a plurality of defining openings. At least some of the sub-pixels 10 have a defining opening 220 between adjacent sub-pixels 10, and the portion of the protrusion 4051 of the inorganic structure 405 exposed by the defining opening 220 serves as a partition portion 4050. The light-emitting functional layer 130 includes a plurality of film layers, and the partition portion 4050 is configured to block at least one of the light-emitting functional layers 130. For example, at least a portion of the protrusion 4051 of the inorganic structure 405 corresponding to one of the adjacent sub-pixels 10 is exposed by the defining opening 220 to serve as a partition portion 4050. For example, the orthographic projection of the defining opening 220 on the substrate BS is generally annular or strip-shaped and surrounds the light-emitting area of ​​the sub-pixel 10.

[0067] By providing the aforementioned partition, at least one layer of the light-emitting functional layer between adjacent sub-pixels can be isolated, thereby reducing the risk of crosstalk between adjacent sub-pixels. At the same time, since the slope angle μ between at least a portion of the surface of the pixel limiting portion surrounding the light-emitting area of ​​the sub-pixel on the side away from the substrate and the first electrode is 25 to 35 degrees, the pixel limiting portion can effectively support the fabrication mask of the light-emitting functional layer, thereby reducing the risk of the fabrication mask contacting and scraping the light-emitting material located in the light-emitting area of ​​the sub-pixel.

[0068] For example, such as Figure 2 and Figure 3 As shown, the display substrate includes at least two different colors of sub-pixels 10, and the protrusion 4051 of the inorganic structure 405 corresponding to each sub-pixel 10 of at least one color is covered by the pixel defining portion 230. For example, as Figure 2As shown, the inorganic structure 405 corresponding to the first sub-pixel 101 is not exposed by the defined opening 220, but this is not the only limitation. For example, when the protrusion 4051 of the inorganic structure 405 corresponding to the sub-pixel 10 is covered by the pixel defining portion 230, the distance between the light-emitting area of ​​the sub-pixel 10 and the adjacent defined opening 220 (i.e., the defined opening 220 that exposes the protrusion 4051 of the inorganic structure 405 corresponding to the adjacent sub-pixel 10) can be made (see reference). Figure 2 The distance T shown is relatively far, which is beneficial to allow the pixel limiting portion 230 of the light-emitting area surrounding the sub-pixel 10 to have a larger setting space, so that the pixel limiting portion 230 can have a good shape, such as having sufficient material thickness, to form a slope angle that meets the requirements (e.g., 25 to 35 degrees).

[0069] For example, such as Figure 2 As shown, multiple sub-pixels 10 are arranged as multiple first sub-pixel groups 0010 and multiple second sub-pixel groups 0020 alternately arranged along a first arrangement direction X. The first sub-pixel group 0010 includes second sub-pixels 102 and third sub-pixels 103 alternately arranged along a second arrangement direction Y. The second sub-pixel group 0020 includes first sub-pixels 101 arranged along the second arrangement direction Y. For example, the first sub-pixels 101, second sub-pixels 102, and third sub-pixels 103 emit different colors. The first arrangement direction X intersects with the second arrangement direction Y and is parallel to the substrate BS.

[0070] For example, such as Figure 2 As shown, the first sub-pixel group 0010 and the second sub-pixel group 0020 are staggered in the second arrangement direction Y, and at least some of the third sub-pixels 103 are surrounded by eight sub-pixels 10, which include alternating first sub-pixels 101 and second sub-pixels 102. For example, the area of ​​the light-emitting region of the first sub-pixel 101 and the area of ​​the light-emitting region of the third sub-pixel 103 are both smaller than the area of ​​the light-emitting region of the second sub-pixel 102, and the area of ​​the light-emitting region of the first sub-pixel 103 is smaller than the area of ​​the light-emitting region of the third sub-pixel 103.

[0071] For example, such as Figure 2 and Figure 3 As shown, the protrusion 4051 of the inorganic structure 405 corresponding to the first sub-pixel 101 is covered by the pixel limiting portion 230. For example, at least a portion of the protrusion 4051 of the inorganic structure 405 corresponding to the second sub-pixel 102 is exposed by the limiting opening 220, and at least a portion of the protrusion 4051 of the inorganic structure 405 corresponding to the third sub-pixel 103 is exposed by the limiting opening 220.

[0072] By ensuring that the protrusion of the inorganic structure corresponding to the first sub-pixel with a smaller light-emitting area is not exposed by the defined opening, it is advantageous to ensure that the pixel defining portion of the light-emitting area surrounding the first sub-pixel has a sufficiently large width, thereby making it advantageous to ensure that this pixel defining portion has a sufficiently large thickness to form a slope angle that meets the requirements (e.g., 25 to 35 degrees), thereby enhancing the scratch resistance of the fabrication mask for the light-emitting element.

[0073] For example, the width of the pixel defining portion refers to the size of the cross-section of the pixel defining portion by a plane perpendicular to its extension direction in the direction of arrangement of adjacent sub-pixels. For example, the extension direction of the pixel defining portion can be a straight line direction or a broken line direction, and the embodiments of this disclosure do not limit this.

[0074] Figure 4 A partial cross-sectional schematic diagram of another display substrate provided for at least one embodiment of this disclosure. For example, this display substrate is compared with... Figure 3 The difference in the display substrate shown is that it also has at least one layer of metal pattern 300, while the rest of the structure is the same. For details, please refer to the relevant descriptions in the above embodiments, which will not be repeated here.

[0075] For example, such as Figure 4 As shown, sub-pixel 10 includes a pixel driving circuit 240, which is located between the first electrode 110 and the substrate BS. The pixel driving circuit 240 is connected to the first electrode 110 to drive the light-emitting functional layer 130 to emit light. For example, the pixel driving circuit 240 may include a plurality of transistors and at least one capacitor (not shown in the figure), and the first electrode 110 may be electrically connected to the pixel driving circuit 240 through a connecting via (not shown in the figure).

[0076] For example, such as Figure 4 As shown, the display substrate also includes at least one metal pattern 300, each metal pattern 300 being located between at least a portion of the first electrode 110 and the pixel driving circuit 240, and each metal pattern 300 including a plurality of metal structures 350. Figure 4The illustration uses a display substrate comprising a single layer of metal pattern 300 as an example, but is not limited thereto. The embodiments of this disclosure do not limit the number of layers of metal pattern 300. For example, in the Z direction, the first electrode 110 of the sub-pixel 10 and the pixel driving circuit 240 of the sub-pixel 10 both overlap with the metal structure 350. For example, the metal structure 350 is located between the first electrode 110 of the sub-pixel 10 and the pixel driving circuit 240. For example, multiple metal structures 350 are arranged in a one-to-one correspondence with multiple sub-pixels 10. For example, the metal pattern 300 may be located in the same film layer as a portion of the structure of the pixel driving circuit 240. For example, the metal structure 350 is configured to transmit DC signals. For example, since the first electrode 110 and the light-emitting element 130 of the sub-pixel 10 are sensitive to signal fluctuations in the pixel driving circuit 240, for example, when the metal structure 350 overlaps with at least one of the gate, source and drain in the pixel driving circuit 240, the metal structure 350 can shield the signal fluctuations of the above structures in the pixel driving circuit 240 (e.g., signal fluctuations of key nodes or AC signals in the pixel driving circuit) to reduce the risk of poor display of the sub-pixel 10.

[0077] For example, such as Figure 4 As shown, the plurality of sub-pixels 10 in the display substrate includes at least two different colors of sub-pixels 10. For example, it may include a plurality of first sub-pixels 101 and a plurality of second sub-pixels 102. For example, the emission colors of the first sub-pixels 101 and the second sub-pixels 102 are different; for example, the first sub-pixel 101 may emit blue light and the second sub-pixel 102 may emit green light, but this disclosure does not limit this. For example, the emission colors of the first sub-pixels 101 and the second sub-pixels 102 may be interchanged. For example, the orthographic projection of the metal structure 350 overlapping with the first electrode 110 of each color of sub-pixel 10 on the substrate BS completely falls within the orthographic projection of the pixel opening 210 corresponding to the respective sub-pixel 10 on the substrate BS. That is, the orthographic projection of the metal structure 350 overlapping with the first electrode 110 of each sub-pixel 10 of different colors on the substrate BS completely falls within the orthographic projection of the pixel opening 210 corresponding to that sub-pixel 10 on the substrate BS. The orthographic projection of the metal structure 350 overlapping the first electrode 110 of either the first sub-pixel 101 or the second sub-pixel 102 onto the substrate BS falls completely into the orthographic projection of the pixel opening 210 corresponding to that sub-pixel 10 onto the substrate BS.

[0078] This configuration allows the metal structure corresponding to sub-pixels of different colors to have a more uniform influence on the light emission angle of the sub-pixels. For example, it can make the pixel limiting part surrounding the pixel opening of sub-pixels of different colors have basically the same slope angle, thereby reducing the difference in light emission effect between sub-pixels of different colors.

[0079] For example, such as Figure 4 As shown, there is a first distance L1 between the orthographic projection of the metal structure 350 overlapping with the first electrode 110 of at least one color sub-pixel 10 on the substrate BS and the orthographic projection of the pixel limiting portion 230 surrounding the light-emitting area of ​​the sub-pixel 10 on the substrate BS. The first distance L1 is not less than 4 micrometers.

[0080] For example, such as Figure 4 As shown, the projected area of ​​the metal structure 350 overlapping with the first electrode 110 of the second sub-pixel 102 on the substrate BS is smaller than the projected area of ​​the pixel opening 210 corresponding to the second sub-pixel 102 on the substrate BS, and the distance between the metal structure 350 and the pixel opening 210 corresponding to the second sub-pixel 102 is a first distance L1. For example, the first distance L2 can be 4.2 micrometers, 4.5 micrometers, 4.8 micrometers or 5 micrometers, and the embodiments of this disclosure are not limited to this.

[0081] This design helps to reduce the impact of the metal structure on the shape of the pixel definition area surrounding the sub-pixel. For example, the metal structure can have virtually no effect on the slope angle of the pixel definition area, thereby reducing the requirements for the manufacturing process and making it easier to control the slope angle of the pixel definition area within the range of 25 to 35 degrees.

[0082] Figure 4 The second sub-pixel 102 is used as an example for explanation, but the embodiments disclosed herein are not limited thereto. For example, the orthographic projection of the metal structure 350 overlapping the first electrode 110 of the first sub-pixel 101 on the substrate BS also has the aforementioned first distance L1 with the orthographic projection of the pixel opening 210 corresponding to the first sub-pixel 101 on the substrate BS.

[0083] This design allows the pixel definition portion of the light-emitting area surrounding sub-pixels of different colors to have a uniform slope angle, and can effectively reduce the manufacturing difficulty, making it easier to control the slope angle of the pixel definition portion surrounding the pixel openings corresponding to sub-pixels of different colors.

[0084] Figure 5 This is a partial cross-sectional schematic diagram of another display substrate provided for at least one embodiment of the present disclosure. For example, Figure 5 The display substrate shown is Figure 4 The difference between the display substrates shown is that the metal patterns are different, but the rest of the structure is the same. For details, please refer to the relevant descriptions in the above embodiments, which will not be repeated here.

[0085] For example, such as Figure 5As shown, the plurality of sub-pixels 10 include at least two different colors of sub-pixels 10, and the metal structure 350 overlapping with the first electrode 110 of the sub-pixel 10 of at least one color includes a portion located outside the pixel opening 210 corresponding to the respective sub-pixel 10. For example, the orthogonal projection area of ​​the metal structure 350 overlapping with the first electrode 110 of the first sub-pixel 101 on the substrate BS is larger than the orthogonal projection area of ​​the pixel opening 210 corresponding to the first sub-pixel 101 on the substrate BS.

[0086] By making the projected area of ​​the metal structure on the substrate of the first electrode of at least one color sub-pixel larger than the projected area of ​​the pixel opening corresponding to the sub-pixel on the substrate, the shielding effect of signal fluctuations in the pixel driving circuit of the sub-pixel can be enhanced, thereby reducing the adverse effects of signal fluctuations in the pixel driving circuit on the light-emitting element and the first electrode of the sub-pixel. This is beneficial for the sub-pixel to have a good light-emitting effect, and at the same time, it also helps to simplify the manufacturing process of the metal structure.

[0087] For example, such as Figure 5 As shown, the protrusion 4051 of the inorganic structure 405 overlapping with the first electrode 110 of each sub-pixel 10 of a certain color is covered by the pixel defining portion 230, and the metal structure 350 overlapping with the first electrode 110 of the sub-pixel 10 of that color includes a portion located outside the pixel opening 210 corresponding to the respective sub-pixel 10. For example, the sub-pixel 10 of the aforementioned color is the first sub-pixel 101, but it is not limited thereto. For example, the metal structure 350 overlapping with the first electrode 110 of the aforementioned sub-pixel 10 of that color is not limited to a single metal structure, but can be a multi-layer metal structure, such as a two-layer metal structure, and the embodiments of this disclosure are not limited thereto.

[0088] For example, such as Figure 5 As shown, the projected area of ​​the metal structure 350 overlapping with the first electrode 110 of the first sub-pixel 101 on the substrate BS is larger than the projected area of ​​the first electrode 110 on the substrate BS. For example, in the arrangement direction of the first sub-pixel 101 and the second sub-pixel 102, as... Figure 5 In the direction R1 shown, the metal structure 350 overlapping with the first electrode 110 of the first sub-pixel 101 protrudes relative to the first electrode 110, thereby effectively shielding signal fluctuations in the pixel driving circuit 240. For example, the protrusion 4051 of the inorganic structure 405 corresponding to the first sub-pixel 101 is not exposed by the defined opening 220, which helps to make the pixel defining portion 230 surrounding the pixel opening 210 corresponding to the first sub-pixel 101 have a good morphology, for example, it can have a slope angle of 25 to 35 degrees.

[0089] For example, such as Figure 5 As shown, the metal structure 350 overlapping with the first electrode 110 of a sub-pixel 10 of a certain color includes a portion located outside the pixel opening 210 corresponding to the sub-pixel 10, and the emission color of the sub-pixel 10 of that color is green. For example, the sub-pixel 10 of the aforementioned color is the first sub-pixel 101, but it is not limited thereto.

[0090] For example, such as Figure 2 and Figure 5 As shown, the display substrate includes a plurality of first sub-pixels 101, a plurality of second sub-pixels 102, and a plurality of third sub-pixels 103. The area of ​​the light-emitting region of the first sub-pixel 101 is smaller than the area of ​​the light-emitting region of the third sub-pixel 103, and the area of ​​the light-emitting region of the third sub-pixel 103 is smaller than the area of ​​the light-emitting region of the second sub-pixel 102. For example, the first sub-pixel 101 is configured to emit green light, the second sub-pixel 102 is configured to emit blue light, and the third sub-pixel 103 is configured to emit red light, but this is not limited to this. For example, the light-emitting colors of the first sub-pixel 101, the second sub-pixel 102, and the third sub-pixel 103 can be interchanged, and the embodiments of this disclosure do not limit this. For example, the orthographic projection of the metal structure 350 overlapping the first electrode 110 of any of the second sub-pixels 102 and the third sub-pixel 103 onto the substrate BS falls into the orthographic projection of the pixel opening 210 corresponding to that sub-pixel 102 onto the substrate BS.

[0091] For example, by including a portion outside the pixel opening corresponding to the first sub-pixel of the first sub-pixel that minimizes the area of ​​the light-emitting region in the overlapping metal structure, it is possible to simplify the manufacturing process of the metal structure and enhance the shielding effect on signal fluctuations in the pixel driving circuit of the first sub-pixel while ensuring that the pixel limiting portion surrounding the pixel opening corresponding to the first sub-pixel has a slope angle of 25 to 35 degrees.

[0092] Figure 6 This is a partial cross-sectional schematic diagram of another display substrate provided for at least one embodiment of the present disclosure. For example, Figure 6 The display substrate shown is Figure 4 The difference between the display substrates shown is that the metal patterns are different, but the rest of the structure is the same. For details, please refer to the relevant descriptions in the above embodiments, which will not be repeated here.

[0093] For example, such as Figure 6As shown, at least one layer of metal pattern 300 includes a first metal pattern 310 and a second metal pattern 320, with the second metal pattern 320 located between the first metal pattern 310 and at least a portion of the pixel driving circuit 240 of the sub-pixel 10. For example, the second metal pattern 320 is located between the first metal pattern 310 and the pixel driving circuit 240 of the sub-pixel 10. For example, in the Z direction, the metal structures 350 of the first metal pattern 310 and the metal structures 350 of the second metal pattern 320 at least partially overlap. For example, a plurality of metal structures 350 of the first metal pattern 310 correspond one-to-one with a plurality of sub-pixels 10 and also correspond one-to-one with a plurality of metal structures 350 of the second metal pattern 320. For example, the metal structures 350 of the first metal pattern 310 and the metal structures 350 of the second metal pattern 320 overlap with each other. For example, the metal structure 350 of the first metal pattern 310 can be disposed on the same layer as the data line, and the metal structure 350 of the second metal pattern 320 can be disposed on the same layer as the power signal line, but the embodiments of this disclosure are not limited thereto. In some embodiments, the metal structure 350 of the second metal pattern 320 can also be disposed on the same layer as the gate line. For example, the first metal structure 350 is located on the side of the corresponding shielded structure in the pixel driving circuit 240 away from the substrate BS. For example, when the shielded structure in the pixel driving circuit 240 is located in the same layer as the gate line, the metal structure 350 that shields the structure is located on the side of the structure away from the substrate BS.

[0094] This configuration allows for the simultaneous shielding of signal fluctuations in the pixel driving circuit through the metal structures in both the first and second metal patterns, effectively reducing the impact of signal fluctuations in the pixel driving circuit and enabling the sub-pixels to have good light-emitting effects.

[0095] For example, such as Figure 6As shown, the pixel opening 210 corresponding to sub-pixel 10 has a first orthographic projection on the substrate BS. Each metal structure 350 of at least one of the first metal pattern 310 and the second metal pattern 320 has a second orthographic projection on the substrate BS. The second orthographic projection falls within the first orthographic projection, and the area of ​​the second orthographic projection is smaller than the area of ​​the first orthographic projection. For example, each metal structure 350 of at least one of the first metal pattern 310 or the second metal pattern 320 has the aforementioned second orthographic projection on the substrate BS. For example, each metal structure 350 of at least one of the first metal pattern 310 and the second metal pattern 320 has the aforementioned second orthographic projection on the substrate BS. For example, each metal structure 350 of the first metal pattern 310 has the aforementioned second orthographic projection on the substrate BS. For example, the distance between the second orthographic projection and the first orthographic projection is a first distance L1, that is, not less than 4 micrometers.

[0096] Therefore, by making each of the metal structures in the first metal pattern and the second metal pattern have a second orthographic projection on the substrate, and the second orthographic projection falls into the first orthographic projection of the pixel opening on the substrate, the first and second metal structures can jointly shield the signal fluctuations in the pixel driving circuit, thereby reducing the impact on the light emission of the sub-pixel's light-emitting element. At the same time, the influence of the metal structure on the morphology of the pixel defining portion surrounding the pixel opening is reduced, which is beneficial to make the pixel defining portion have a good and uniform slope angle, so as to reduce the scratching of the mask on the light-emitting material located in the pixel opening during the fabrication of the light-emitting element.

[0097] For example, such as Figure 6 As shown, the orthographic projection of the metal structure 350 in the first metal pattern 310 onto the substrate BS falls within the first orthographic projection, and the orthographic projection of the metal structure 350 in the second metal pattern 320 onto the substrate BS includes the portion located outside the first orthographic projection. For example, the orthographic projection area of ​​the metal structure 350 in the first metal pattern 310 onto the substrate BS is smaller than the orthographic projection area of ​​the metal structure 350 in the second metal pattern 320 onto the substrate BS. For example, the orthographic projection of the metal structure 350 in the first metal pattern 310 onto the substrate BS serves as the aforementioned second orthographic projection.

[0098] Therefore, the metal structure in the first metal pattern is closer to the light-emitting element of the sub-pixel than the metal structure in the second metal pattern. Thus, the signal fluctuations in the pixel driving circuit can be effectively shielded by the metal structure of the second metal pattern with a larger orthographic projection area on the substrate. At the same time, the metal structure in the first metal pattern has a smaller second orthographic projection, which reduces the impact on the shape of the pixel defining part. This allows the pixel defining part to effectively support the fabrication mask of the light-emitting element, thereby reducing the scratching of the light-emitting material located in the pixel opening.

[0099] Figure 7 This is a partial cross-sectional schematic diagram of another display substrate provided for at least one embodiment of the present disclosure. For example, Figure 7 The display substrate shown is Figure 4 The difference between the display substrates shown is that the metal patterns are different, but the rest of the structure is the same. For details, please refer to the relevant descriptions in the above embodiments, which will not be repeated here.

[0100] For example, such as Figure 7 As shown, the display substrate includes a metal pattern 300 located between at least a portion of the first electrode 110 and the pixel driving circuit 240. For example, at least one layer of the metal pattern 300 includes a first metal portion 301 and a second metal portion 302 corresponding to each sub-pixel 10. In the Z direction, the first metal portion 301 corresponding to the sub-pixel 10 overlaps with the first electrode 110 of the sub-pixel 10, and the second metal portion 302 corresponding to the sub-pixel 10 overlaps with the pixel defining portion 230 surrounding the pixel opening 210 corresponding to the sub-pixel 10.

[0101] For example, such as Figure 7 As shown, the metal pattern 300 includes a plurality of first metal portions 301 and a plurality of second metal portions 302. For example, the plurality of first metal portions 301 correspond one-to-one with a plurality of sub-pixels 10. For example, the orthographic projection area of ​​the first metal portion 301 on the substrate BS is smaller than the orthographic projection area of ​​the light-emitting area of ​​the sub-pixel 10 on the substrate BS. For example, the orthographic projection of the first metal portion 301 on the substrate BS does not overlap with the orthographic projection of the edge of the light-emitting area of ​​the sub-pixel 10 on the substrate BS. For example, the orthographic projection of the first metal portion 301 on the substrate BS falls entirely within the orthographic projection of the light-emitting area of ​​the sub-pixel 10 on the substrate BS.

[0102] For example, such as Figure 7As shown, the second metal portion 302 surrounds the light-emitting area of ​​the sub-pixel 10. For example, the light-emitting area of ​​a sub-pixel 10 can be surrounded by multiple second metal portions 302, or it can be surrounded by a ring-shaped second metal portion 302. For example, a second metal portion 302 can be provided between adjacent sub-pixels 10. For example, the orthographic projection of the second metal portion 302 surrounding the light-emitting area of ​​the sub-pixel 10 on the substrate BS can be a non-closed ring. For example, the first metal portion 301 corresponding to the sub-pixel 10 refers to the first metal portion 301 overlapping with the light-emitting area of ​​the sub-pixel 10, and the second metal portion 302 corresponding to the sub-pixel 10 refers to the second metal portion 302 surrounding the light-emitting area of ​​the sub-pixel 10 and overlapping with the pixel defining portion 230 surrounding the light-emitting area of ​​the sub-pixel 10. For example, in adjacent sub-pixels 10 (such as... Figure 7 In the direction of the arrangement of the second sub-pixel 102 and the first sub-pixel 101 shown, i.e. in direction R1, the cross section of the pixel limiting portion 230 cut by a plane parallel to the arrangement direction of the adjacent sub-pixel 10 and perpendicular to the substrate BS has a first dimension in direction R1, and the second metal portion 302 has a second dimension in direction R1, and the second dimension is smaller than the first dimension.

[0103] For example, such as Figure 7 As shown, there is a gap SP between the first metal portion 301 and the second metal portion 302 corresponding to sub-pixel 10, and the edge of the pixel limiting portion 230 surrounding the pixel opening 210 corresponding to sub-pixel 10 near the first metal portion 301 does not overlap with the metal pattern 300. For example, with Figure 7 Taking the second sub-pixel 102 as an example, the distance between the first metal portion 301 and the second metal portion 302 corresponding to the second sub-pixel 102 (i.e., the size of the interval SP in the direction R1) is L0, the distance between the first metal portion 301 and the pixel opening 210 corresponding to the second sub-pixel 102 is W1, and the distance between the second metal portion 302 and the pixel opening 210 corresponding to the second sub-pixel 102 is W2. For example, W1 can be approximately equal to W2.

[0104] This configuration reduces the supporting effect of the first metal part and the second metal part on the edge of the pixel limiting part surrounding the pixel opening corresponding to the sub-pixel. This helps to increase the slope angle between at least a portion of the surface of the pixel limiting part on the side of the first electrode away from the substrate and the first electrode, making the pixel limiting part stronger in supporting the fabrication mask of the light-emitting element, thereby reducing the scratching of the fabrication mask on the light-emitting material located in the pixel opening.

[0105] Figure 8 This is a partial cross-sectional schematic diagram of another display substrate provided for at least one embodiment of the present disclosure. For example, Figure 8 The display substrate shown is Figure 3The difference between the display substrates shown lies in the inorganic layer; the rest of the structure is the same. For details, please refer to the relevant descriptions in the above embodiments, which will not be repeated here.

[0106] For example, such as Figure 2 and Figure 8 As shown, the edge of the protrusion 4051 covered by the pixel limiting portion 230 has a second distance L2 between it and the pixel opening 210 corresponding to the sub-pixel 10, and the second distance L2 is not less than 1 / 2 of the dimension L3 of the pixel limiting portion 230 in the direction of the second distance L2. For example, the dimensions of each sub-pixel 10 in the direction of the second distance L2 are substantially the same. For example, the inorganic structure 405 corresponding to the sub-pixel 10 refers to the inorganic structure 405 overlapping with the first electrode 110 of the sub-pixel 10. For example, as Figure 8 As shown, the protrusion 4051 of the inorganic structure 405 corresponding to the first sub-pixel 101 is not exposed by the defined opening 220, but is completely covered by the pixel defining portion 230. Therefore, at least a portion of the protrusion 4051 of the inorganic structure 405 corresponding to the sub-pixel 10 (e.g., the second sub-pixel 102) adjacent to the first sub-pixel 101 is exposed by the defined opening 220 to serve as a partition portion 4050.

[0107] For example, such as Figure 8 As shown, the distance between the edge of the inorganic structure 405 corresponding to the first sub-pixel 101 and the pixel opening 210 corresponding to the first sub-pixel 101 is the second distance L2. The second distance L2 is greater than or equal to half of the dimension L3 of the pixel limiting portion 230 surrounding the light-emitting area of ​​the first sub-pixel 101 in the direction of the second distance L2. For example, the second distance L2 can be two-thirds of the aforementioned dimension L3, but is not limited thereto. For example, the aforementioned second distance L2 can be 1 to 15 micrometers, such as at least one of 1 to 3 micrometers, 3 to 5 micrometers, 5 to 10 micrometers, 10 to 12 micrometers, and 12 to 15 micrometers, or can be other values ​​among 1 to 15 micrometers. For example, the second distance L2 does not exceed half of the dimension of the light-emitting area of ​​the sub-pixel in the direction R1, and the embodiments of this disclosure do not limit this.

[0108] This configuration allows for the support of at least a portion of the pixel definition portion by an inorganic structure. For example, it allows most of the pixel definition portion surrounding the light-emitting area of ​​the sub-pixel to be located on the side of the inorganic structure away from the substrate. This also allows the portion of the pixel definition portion on the inorganic structure to have a sufficiently large thickness, thereby enabling at least a portion of the surface of the pixel definition portion on the side of the first electrode away from the substrate to form a slope angle with the first electrode as large as possible, thus improving the scratch resistance of the mask used to fabricate the light-emitting element.

[0109] Figure 9A partial planar structure schematic diagram of another display substrate provided for at least one embodiment of the present disclosure; Figure 10 For along Figure 9 A schematic diagram of the local cross-section structure intercepted by line B-B'.

[0110] For example, such as Figure 9 and Figure 10 As shown, the display substrate includes an inorganic layer 410 and an organic layer 420. The inorganic layer 410 is located on a substrate BS and includes a plurality of first partition structures 413. The organic layer 420 is located on the side of the inorganic layer 410 closest to the substrate BS and is in contact with the inorganic layer 410. The organic layer 420 includes a plurality of second partition structures 423. Both the first partition structures 413 and the second partition structures 423 are located between adjacent sub-pixels 10, and the first partition structure 413 includes a protrusion 4051 that protrudes relative to the edge of the second partition structure 423. Both the first partition structures 413 and the second partition structures 423 are spaced apart from the pixel defining portion 230.

[0111] For example, such as Figure 9 and Figure 10 As shown, the light-emitting functional layer 130 includes multiple film layers, and the pixel defining layer 200 includes multiple defining openings 220. Each defining opening 220 is located between adjacent sub-pixels 10. The protrusion 4051 of the first blocking structure 413 is exposed by the defining opening 220 to block at least one layer of the light-emitting functional layer 130. For example, at least one layer of the light-emitting functional layer 130 of adjacent sub-pixels 10 is blocked by the protrusion 4051 of the first blocking structure 413, thereby reducing the risk of crosstalk between adjacent sub-pixels 10.

[0112] For example, such as Figure 9 As shown, the inorganic layer 410 includes multiple inorganic structures 405, and the organic layer 420 includes multiple organic structures 415, with the inorganic structures 405 protruding from the edges of the organic structures 415. For example, the first electrode 110 of the sub-pixel 10 is located on the surface of the inorganic structure 405 away from the substrate BS, and the inorganic structure 405 enables the sub-pixel 10 to have good electrode flatness. For example, the organic layer 420 also includes a portion 427 other than the organic structure 415 and the second partition structure 423, and this portion 427 is integrally formed with the organic structure 415 and the second partition structure 423. For example, the inorganic structure 405 and the first partition structure 413 can be formed by the same process. For example, the organic structure 415 and the second partition structure 423 can be fabricated by the same process. For example, when the inorganic layer 410 is patterned to form the inorganic structure 405 and the first partition structure 413, the etching solution etches the portion of the organic layer 420 that is in contact with the inorganic layer 410, thereby forming the organic structure 415 and the second partition structure 423.

[0113] By placing a first partition structure and a second partition structure for separating at least one layer of the light-emitting functional layer between adjacent sub-pixels, it is beneficial to increase the width of the pixel defining portion, which in turn is beneficial to make the pixel defining portion have a good morphology. For example, at least a portion of the surface of the pixel defining portion on the side away from the substrate of the first electrode can have a sufficiently large slope angle with the first electrode, thereby effectively supporting the fabrication mask of the light-emitting functional layer and reducing the scratching of the fabrication mask on the light-emitting material located in the pixel opening.

[0114] about Figure 9 and Figure 10 For other structures in the display substrate shown, please refer to the relevant descriptions in the above embodiments, which will not be repeated here.

[0115] Figure 11 A partial planar structure schematic diagram of another display substrate provided for at least one embodiment of the present disclosure; Figure 12 for Figure 11 The diagram shown illustrates the mask setup process for the display substrate during manufacturing.

[0116] For example, refer to Figure 9 and Figure 11 The display substrate may further include a plurality of support structures 700 located on the substrate BS. The support structures 700 are located on one side of the pixel opening 210 corresponding to the sub-pixel 10, and at least a portion of the surface of the support structure 700 away from the substrate BS is further away from the pixel defining portion 230 than the pixel defining portion 230. For example, the support structure 700 may be configured as a support mask, such as a mask for forming the light-emitting functional layer 130. For example, the support structure 700 may be located within the pixel defining layer 200. For example, the support structure 700 may be a part of the pixel defining layer 200. For example, the support structure 700 may be located between adjacent sub-pixels 10, but is not limited thereto.

[0117] For example, refer to Figure 12 In the Z direction, the difference between the maximum size of the support structure 700 and the maximum size of the pixel defining portion 230 is at least 0.5 micrometers, such as 0.8 micrometers or 0.1 micrometers, and the embodiments of this disclosure are not limited to this. Therefore, the support structure 700 can effectively support the mask 710, thereby reducing the rubbing of the mask 710 against the light-emitting material located within the pixel opening 210.

[0118] Figure 13 This is a schematic diagram illustrating the fabrication process of a pixel-defining layer in a display substrate.

[0119] For example, such as Figure 13As shown, the pixel defining material 0200 forms a pixel defining layer after being exposed through a mask 610. The mask 610 includes a plurality of mask openings 601. After the pixel defining material 0200 is exposed, there is a third distance Lm between the orthographic projection of the mask openings 601 on the substrate BS and the orthographic projection of the pixel openings 210 on the substrate BS.

[0120] Figure 14 The optical path diagram of a pixel-defined material when it is exposed through a mask; Figure 15 A planar schematic diagram of the pixel-defining layer obtained after exposure processing of the pixel-defining material.

[0121] For example, refer to Figure 14 and Figure 15 The incident light ray E1 has an incident point E0 on the first electrode 110 corresponding to the edge of the light-emitting area of ​​the sub-pixel 10. After reaching the incident point E0, the incident light ray E1 is reflected on the surface of the first electrode 110 and then emitted as the outgoing light ray E2. Similarly, the outgoing light ray E3 is the outgoing light ray after another incident light ray is reflected on the surface of the first electrode 110. For example, the portion of the pixel defining material located on the side of the outgoing light ray E2 away from the substrate BS, the portion located on the side of the outgoing light ray E3 away from the substrate BS, and the portion located in the mask opening 601 are all removed to form a shape as shown in the image. Figure 15 The pixel defining layer 200 is shown. For example, the maximum angle between the incident light ray E1 and the outgoing light ray E2 is β1. For example, at least a portion of the surface of the pixel defining portion 230 located on the side of the first electrode 110 away from the substrate BS has a first slope angle with the first electrode 110.

[0122] Figure 16 This is a schematic diagram illustrating the fabrication process of a pixel-defining layer in a display substrate, provided for at least one embodiment of the present disclosure.

[0123] For example, such as Figure 16 As shown, the pixel defining material 0200 forms a pixel defining layer after being exposed through a mask 620. The mask 610 includes multiple mask openings 602. After exposure, the orthographic projection of the mask openings 602 onto the substrate BS and the orthographic projection of the pixel openings 210 onto the substrate BS have a third distance Lm, which is no greater than 2 micrometers. For example, the third distance Lm can be 1 micrometer to 1.5 micrometers, such as 1.2 micrometers, 1.3 micrometers, or 1.4 micrometers. The embodiments of this disclosure do not limit this. For example, compared to... Figure 13 The mask 610 shown is shown. Figure 16 The third distance Lm corresponding to the mask opening 602 of the mask 620 shown is smaller than the above-mentioned third distance Lm.

[0124] Figure 17 This is an optical path diagram of a pixel-defined material being exposed via a mask in at least one embodiment of this disclosure.

[0125] For example, refer to Figure 15 and Figure 17 When the portion of the pixel-defining material located on the side of the outgoing light ray E2 away from the substrate BS, the portion located on the side of the outgoing light ray E3 away from the substrate BS, and the portion located in the mask opening 601 are all removed, the maximum angle β2 between the incident light ray E1 and the outgoing light ray E2 is less than Figure 14 The maximum angle β1 shown allows the final pixel definition portion 230 to have a second slope angle between at least a portion of the surface of the first electrode 110 on the side away from the substrate BS and the first electrode 110, and the second slope angle is greater than the first slope angle.

[0126] Therefore, by reducing the third distance corresponding to the mask opening, it is beneficial to increase the slope angle corresponding to the final pixel definition portion, which in turn enhances the support capability of the pixel definition portion for the fabrication mask of the light-emitting functional layer, thereby reducing the scratching of the fabrication mask on the light-emitting material located in the pixel opening.

[0127] Another embodiment of this disclosure provides a display panel that includes any of the display substrates described above. Therefore, the technical effects of the aforementioned display substrates can also be reflected in this display panel, and will not be elaborated further here. For example, the display panel may further include an Enhancement Efficiency Structure (EES) located on the display substrate (e.g., on its encapsulation layer) to enhance light extraction efficiency. For example, the display panel may further include a color filter, which may be located on the side of the EES away from the display substrate, but is not limited thereto; by providing a color filter, the color intensity of light can be enhanced. For example, the display panel may also have other film layers, which are not limited in the embodiments of this disclosure.

[0128] Figure 18 A schematic block diagram of a display device provided for at least one embodiment of the present disclosure.

[0129] like Figure 18 As shown, another embodiment of this disclosure provides a display device that includes any of the above-described display substrates. Therefore, the technical effects of the aforementioned display substrates can also be achieved in this display device, and will not be elaborated further here.

[0130] For example, the display device also includes a cover plate located on the light-emitting side of the display substrate.

[0131] For example, the display device can be an organic light-emitting diode display device or other display device, as well as any product or component with display function, such as a television, digital camera, mobile phone, watch, tablet computer, laptop computer, or navigator that includes the display device. This embodiment is not limited to this.

[0132] The following points need to be explained:

[0133] (1) The accompanying drawings of the embodiments of this disclosure only involve the structures involved in the embodiments of this disclosure, and other structures can be referred to the general design.

[0134] (2) Where there is no conflict, features of the same embodiment and different embodiments of this disclosure may be combined with each other.

[0135] The above description is merely an exemplary embodiment of this disclosure and is not intended to limit the scope of protection of this disclosure, which is determined by the appended claims.

Claims

1. A display substrate, comprising: Substrate; Multiple sub-pixels are located on the substrate. Each sub-pixel includes a light-emitting functional layer and a first electrode and a second electrode located on opposite sides of the light-emitting functional layer along a direction perpendicular to the substrate. The first electrode is located between at least a portion of the light-emitting functional layer and the substrate. A pixel defining layer is located between the light-emitting functional layer and the substrate. The pixel defining layer includes a plurality of pixel openings and pixel defining portions located between adjacent pixel openings. The pixel openings expose at least a portion of the first electrode, and the light-emitting functional layer is disposed in contact with the first electrode through the pixel openings. Wherein, at least a portion of the surface of the pixel defining portion located on the side of the first electrode away from the substrate has a slope angle with the first electrode, the slope angle being 25 to 35 degrees. The sub-pixel includes a pixel driving circuit located between the first electrode and the substrate. The pixel driving circuit is electrically connected to the first electrode to drive the light-emitting functional layer to emit light. The display substrate further includes at least one layer of metal pattern, which is located between the first electrode and at least a portion of the pixel driving circuit. Each layer of the metal pattern includes multiple metal structures. In a direction perpendicular to the substrate, the first electrode of the sub-pixel and the pixel driving circuit of the sub-pixel both overlap with the metal structures. The at least one layer of metal pattern includes a first metal pattern and a second metal pattern, wherein the second metal pattern is located between the first metal pattern and at least a portion of the pixel driving circuit of the sub-pixel. In a direction perpendicular to the substrate, the metal structure of the first metal pattern at least partially overlaps with the metal structure of the second metal pattern. The projected area of ​​the metal structure in the first metal pattern on the substrate is smaller than the projected area of ​​the metal structure in the second metal pattern on the substrate. The pixel opening corresponding to the sub-pixel has a first orthographic projection on the substrate, the orthographic projection of the metal structure in the first metal pattern on the substrate falls into the first orthographic projection, and the orthographic projection of the metal structure in the second metal pattern on the substrate includes the portion located outside the first orthographic projection.

2. The display substrate according to claim 1, wherein, In a direction perpendicular to the substrate, the maximum distance between the surface of the pixel defining portion away from the substrate and the substrate is greater than the maximum distance between the surface of the light-emitting functional layer in the pixel opening away from the substrate and the substrate.

3. The display substrate according to claim 1 or 2, wherein, The distance between the orthographic projection of the metal structure in the first metal pattern onto the substrate and the first orthographic projection is not less than 4 micrometers.

4. The display substrate according to claim 1 or 2, further comprising: An inorganic layer is located between the first electrode of the sub-pixel and the substrate. The inorganic layer includes a plurality of inorganic structures, at least a portion of which are located in the pixel opening corresponding to the sub-pixel. An organic layer is located between the inorganic layer and the substrate and is in contact with the inorganic layer. The organic layer includes a plurality of organic structures, and each inorganic structure includes a protrusion that protrudes relative to the edge of the organic structure. The light-emitting functional layer includes multiple film layers, and at least some of the sub-pixels have a defined opening between adjacent sub-pixels. The portion of the protrusion of the inorganic structure exposed by the defined opening serves as a partition portion, and the partition portion is configured to partition at least one of the light-emitting functional layers.

5. The display substrate according to claim 4, wherein, The plurality of sub-pixels includes at least two different colors of sub-pixels, and the protrusion of the inorganic structure corresponding to each of the sub-pixels of at least one color is covered by the pixel defining portion.

6. The display substrate according to claim 5, wherein, The edge of the protrusion covered by the pixel defining portion has a second distance between it and the pixel opening corresponding to the sub-pixel, and the second distance is not less than 1 / 2 of the size of the pixel defining portion in the direction of the second distance.

7. The display substrate according to claim 6, wherein, The second distance is 1 to 15 micrometers.

8. The display substrate according to claim 5, wherein, The at least two different colored sub-pixels include a first sub-pixel and a second sub-pixel, wherein the area of ​​the light-emitting region of the first sub-pixel is smaller than the area of ​​the light-emitting region of the second sub-pixel. The protrusion of the inorganic structure corresponding to the first sub-pixel is covered by the pixel defining portion.

9. The display substrate according to claim 5, wherein, The protrusion of the inorganic structure that overlaps with the first electrode of each of the sub-pixels of a certain color is covered by the pixel defining portion, and the metallic structure that overlaps with the first electrode of the sub-pixel of that color includes a portion located outside the pixel opening corresponding to the respective sub-pixel.

10. The display substrate according to claim 1, further comprising: An inorganic layer is located on the substrate, and the inorganic layer includes a plurality of first partition structures; An organic layer is located on the side of the inorganic layer closest to the substrate and in contact with the inorganic layer. The organic layer includes a plurality of second spacer structures. The first partition structure and the second partition structure are both located between adjacent sub-pixels. The first partition structure includes a protrusion that protrudes relative to the edge of the second partition structure. Both the first partition structure and the second partition structure are spaced apart from the pixel defining portion. The light-emitting functional layer includes multiple film layers, and the pixel defining layer includes multiple defining openings, each of the defining openings being located between adjacent sub-pixels. The protrusion of the first partition structure is exposed by the defining opening to partition at least one of the light-emitting functional layers.

11. The display substrate according to claim 1, wherein, The pixel-defining material is exposed through a mask to form the pixel-defining layer. The mask includes multiple mask openings. After the pixel defining material undergoes the exposure process, there is a third distance between the orthogonal projection of the mask opening on the substrate and the orthogonal projection of the pixel opening in the pixel defining layer on the substrate, and the third distance is not greater than 2 micrometers.

12. The display substrate according to claim 11, wherein, The third distance is 1 micrometer to 1.5 micrometers.

13. The display substrate according to claim 1, further comprising a plurality of support structures located on the substrate, wherein the support structures are located on one side of the pixel opening corresponding to the sub-pixel. in, At least a portion of the surface of the support structure that is away from the substrate is further away from the substrate than the surface of the pixel defining portion that is away from the substrate, and in a direction perpendicular to the substrate, the difference between the maximum size of the support structure and the maximum size of the pixel defining portion is at least 0.5 micrometers.

14. A display panel comprising the display substrate according to any one of claims 1-13.

15. A display device comprising the display substrate according to any one of claims 1-13.

Images