Display substrate, display panel, and display device

Abstract

Provided are a display substrate, a display panel, and a display device. The display substrate comprises a plurality of sub-pixels; each sub-pixel comprises a base substrate, and a reflecting layer, a micro-cavity adjustment layer, and a light-emitting structure layer which are sequentially arranged; the light-emitting structure layer comprises a first electrode; the sub-pixel further comprises a driving circuit layer and an adapter portion; the driving circuit layer and the first electrode are connected by means of the adapter portion; the plurality of sub-pixels comprise a first sub-pixel, a second sub-pixel and a third sub-pixel; the third sub-pixel comprises a third adapter portion; the third adapter portion comprises a first electrode adapter layer and a second electrode adapter layer; the first electrode adapter layer comprises a first portion, a second portion and a third portion; the second portion is electrically connected to the second electrode adapter layer; the first portion is located on the first side of the second portion facing the first sub-pixel; the first portion has a first slope angle; the third portion is located on the second side of the second portion facing the second sub-pixel; the second portion has a second slope angle; the second slope angle is greater than the first slope angle.

Description

Display substrate, display panel, and display device Technical Field

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

[0002] Microdisplays have broad market applications and are particularly well-suited for use in display devices such as helmet-mounted displays (HMDs), stereoscopic displays, and eyewear displays. Silicon-based organic light-emitting diodes (OLEDs), a new type of OLED display device based on a silicon substrate, offer small size, high contrast, fast response, and high resolution. They are widely used in near-eye displays, virtual reality (VR), and augmented reality (AR), particularly in AR / VR head-mounted displays.

[0003] However, the brightness of silicon-based OLEDs currently cannot meet the display requirements of AR / VR. To improve the display brightness of silicon-based OLEDs, related technologies use strong microcavity structures to enhance the brightness of display devices. The different cavity lengths of adjacent sub-pixels lead to different optical environments of adjacent sub-pixels, causing color shift. In particular, when the transition layer of the anode hole uses a reflective metal structure, this further affects the display uniformity. Therefore, how to improve the brightness of silicon-based OLED microdisplays and reduce the color shift of display devices is a technical problem that needs to be solved in this field.

[0004] The above information disclosed in this section is only for understanding the background of the technical concept of the present disclosure and therefore the above information may contain information that does not constitute the prior art.

[0005] Summary of the Invention

[0006] In one aspect, a display substrate is provided, characterized by comprising a plurality of pixel units arranged in an array, the pixel units comprising a plurality of sub-pixels, the sub-pixels comprising: a base substrate; a reflective layer disposed on the base substrate; and a microcavity adjustment layer and a light-emitting structure layer disposed on a side of the reflective layer away from the base substrate, wherein the light-emitting structure layer comprises a first electrode, a light-emitting layer, and a second electrode sequentially disposed on the microcavity adjustment layer, and the distance between the second electrode and the reflective layer in the plurality of sub-pixels is different;

[0007] The sub-pixel further includes a pixel definition layer, a driving circuit layer, and a transition portion, wherein the pixel definition layer is used to define a light-emitting area of ​​the sub-pixel; the driving circuit layer and the first electrode of the light-emitting structure layer are connected via the transition portion; and the orthographic projection of the transition portion on the base substrate falls within the orthographic projection of the pixel definition layer on the base substrate;

[0008] The plurality of sub-pixels include a first sub-pixel, a second sub-pixel, and a third sub-pixel, wherein the third sub-pixel includes a third transition portion, and an orthographic projection of the third transition portion on the base substrate is located in a gap between orthographic projections of the first sub-pixel and the second sub-pixel on the base substrate;

[0009] The third transfer portion includes a first electrode transfer layer and a second electrode transfer layer, wherein the second electrode transfer layer is located in a first via hole, and the first via hole passes through the pixel definition layer; the first electrode transfer layer is located on a side of the second electrode transfer layer away from the base substrate; the first electrode transfer layer includes a first portion, a second portion, and a third portion, wherein the second portion is electrically connected to the second electrode transfer layer, the first portion is located on a first side of the second portion facing the first sub-pixel, and the first portion has a first slope angle; the third portion is located on a second side of the second portion facing the second sub-pixel, and the second portion has a second slope angle.

[0010] Wherein, the second slope angle is greater than the first slope angle.

[0011] According to some exemplary embodiments, the orthographic projection of the first portion on the base substrate does not overlap with the orthographic projection of the first via on the base substrate; and / or the orthographic projection of the third portion on the base substrate does not overlap with the orthographic projection of the first via on the base substrate.

[0012] According to some exemplary embodiments, an absolute value of a difference between the first slope angle and the second slope angle is greater than or equal to 2° and less than or equal to 20°.

[0013] According to some exemplary embodiments, at least a portion of the driving circuit layer is located on the same layer as the reflective layer, and an orthographic projection of the third transition portion on the base substrate falls within an orthographic projection of the driving circuit layer on the base substrate;

[0014] The orthographic projection of the driving circuit layer on the base substrate protrudes by a first protrusion distance in a direction close to the first sub-pixel relative to the orthographic projection of the third adapter on the base substrate;

[0015] The orthographic projection of the driving circuit layer on the base substrate protrudes by a second protrusion distance in a direction close to the second sub-pixel relative to the orthographic projection of the third adapter on the base substrate, wherein:

[0016] The first protrusion distance is greater than the second protrusion distance.

[0017] According to some exemplary embodiments, the first protrusion distance is greater than or equal to 0.1 micrometers and less than or equal to 0.3 micrometers; and / or,

[0018] The second protrusion distance is greater than or equal to 0.1 micrometers and less than or equal to 0.3 micrometers.

[0019] According to some exemplary embodiments, a ratio of an absolute value of a difference between the second slope angle and the first slope angle to the second slope angle is a slope angle difference ratio;

[0020] The ratio of the absolute value of the difference between the first protrusion distance and the second protrusion distance to the second protrusion distance is a protrusion distance difference ratio, wherein,

[0021] An absolute value of a difference between the slope angle difference ratio and the protrusion distance difference ratio is greater than or equal to 1% and less than or equal to 10%.

[0022] According to some exemplary embodiments, the first sub-pixel includes a first reflective layer, and the second sub-pixel includes a second reflective layer, wherein:

[0023] The orthographic projection of the first reflective layer on the substrate at least partially overlaps with the orthographic projection of the pixel definition layer on the substrate, and the overlapping portion of the projections of the first reflective layer and the pixel definition layer has a first width;

[0024] The orthographic projection of the second reflective layer on the base substrate at least partially overlaps with the orthographic projection of the pixel definition layer on the base substrate, and the overlapping portion of the projections of the second reflective layer and the pixel definition layer has a second width.

[0025] Wherein, the second width is greater than the first width.

[0026] According to some exemplary embodiments, the first width is greater than or equal to 0.1 micrometers and less than or equal to 0.3 micrometers; and / or,

[0027] The second width is greater than or equal to 0.1 micrometer and less than or equal to 0.3 micrometer.

[0028] According to some exemplary embodiments, the first electrode includes a main portion and an edge portion, and an orthographic projection of the edge portion on the base substrate at least partially overlaps with an orthographic projection of the pixel definition layer on the base substrate, wherein:

[0029] The main body portion has a first thickness, and the edge portion has a second thickness, wherein the first thickness is smaller than the second thickness.

[0030] According to some exemplary embodiments, the first electrode of the first sub-pixel includes a first edge portion having a third thickness; the first electrode of the second sub-pixel includes a second edge portion having a fourth thickness;

[0031] Wherein, the third thickness is smaller than the fourth thickness.

[0032] According to some exemplary embodiments, the driving circuit layer includes a first side close to the first sub-pixel and a second side close to the second sub-pixel;

[0033] The first via hole includes a third side close to the first sub-pixel and a fourth side close to the second sub-pixel,

[0034] wherein the first side and the third side are spaced apart by a third distance; the second side and the fourth side are spaced apart by a fourth distance,

[0035] The third spacing distance is greater than the fourth spacing distance.

[0036] According to some exemplary embodiments, the third spacing distance is greater than or equal to 0.2 micrometers and less than or equal to 0.8 micrometers; and / or,

[0037] The fourth spacing distance is greater than or equal to 0.2 micrometers and less than or equal to 0.8 micrometers.

[0038] According to some exemplary embodiments, the first portion is spaced apart from the first edge portion by a fifth spacing distance; the third portion is spaced apart from the second edge portion by a sixth spacing distance, wherein,

[0039] The fifth spacing distance is equal to the sixth spacing distance.

[0040] According to some exemplary embodiments, the fifth spacing distance is greater than or equal to 0.5 micrometers and less than or equal to 1 micrometer; and / or,

[0041] The sixth spacing distance is greater than or equal to 0.5 micrometers and less than or equal to 1 micrometer.

[0042] According to some exemplary embodiments, the first via hole is spaced apart from the first sub-pixel by a seventh spacing distance; the first via hole is spaced apart from the second sub-pixel by an eighth spacing distance.

[0043] The seventh spacing distance is greater than the eighth spacing distance.

[0044] According to some exemplary embodiments, the second portion is substantially parallel to the base substrate.

[0045] According to some exemplary embodiments, the pixel definition layer further includes a second via hole, and an orthographic projection of the first via hole on the base substrate falls within an orthographic projection of the second via hole on the base substrate;

[0046] The first electrode of the third sub-pixel includes a first sub-electrode located in the first via hole and a second sub-electrode located in the second via hole, and the first sub-electrode and the second sub-electrode form a groove electrode.

[0047] According to some exemplary embodiments, the second electrode of the first sub-pixel is close to the first surface of the base substrate and is spaced apart from the first reflective layer by a first spacing distance away from the second surface of the base substrate;

[0048] The second electrode of the second sub-pixel is close to the third surface of the base substrate and is spaced apart from the second reflective layer by a second spacing distance from the fourth surface of the base substrate.

[0049] The first spacing distance is smaller than the second spacing distance.

[0050] According to some exemplary embodiments, the first sub-pixel includes a first microcavity adjustment layer, the second sub-pixel includes a second microcavity adjustment layer, and a thickness of the first microcavity adjustment layer is smaller than a thickness of the second microcavity adjustment layer.

[0051] According to some exemplary embodiments, the pixel definition layer has a stepped structure near an edge of the light-emitting area.

[0052] According to some exemplary embodiments, the pixel definition layer includes a first sidewall close to the first sub-pixel and a second sidewall close to the second sub-pixel, wherein:

[0053] The number of steps of the first side wall is greater than the number of steps of the second side wall.

[0054] According to some exemplary embodiments, the second portion of the first electrode transfer layer in the third sub-pixel is spaced apart from the surface of the base substrate and the surface of the base substrate close to the light emitting structure layer by a tenth spacing distance, the first electrode in the first sub-pixel is spaced apart from the surface of the base substrate and the surface of the base substrate close to the light emitting structure layer by an eleventh spacing distance, and the tenth spacing distance is greater than the eleventh spacing distance;

[0055] A surface of the first electrode in the second sub-pixel away from the base substrate is spaced a twelfth distance from a surface of the base substrate close to the light emitting structure layer, and the tenth distance is greater than the twelfth distance.

[0056] According to some exemplary embodiments, the first electrode includes a first conductive portion and a second conductive portion, wherein the first conductive portion is located in the third via hole, and the orthographic projection of the second conductive portion on the base substrate does not overlap with the orthographic projection of the third via hole on the base substrate, wherein the first conductive portion includes a protruding structure, and the thickness of the protruding structure in the first conductive portion is less than the thickness of the second conductive portion.

[0057] According to some exemplary embodiments, the first electrode transition layer and the second electrode transition layer are an integral structure formed in a same patterning process.

[0058] According to some exemplary embodiments, the second electrode transition layer is located in the first via; the first electrode includes a first conductive portion, which is located in the third via, wherein the first conductive portion is electrically connected to the second portion in the first electrode transition layer, and wherein the orthographic projection of the first via on the substrate does not overlap with the orthographic projection of the third via on the substrate.

[0059] In another aspect, a display substrate is provided, characterized by comprising a plurality of pixel units arranged in an array, the pixel units comprising a plurality of sub-pixels, the sub-pixels comprising: a base substrate; a reflective layer disposed on the base substrate; and a microcavity adjustment layer and a light-emitting structure layer disposed on a side of the reflective layer away from the base substrate, wherein the light-emitting structure layer comprises a first electrode, a light-emitting layer, and a second electrode sequentially disposed on the microcavity adjustment layer, and the distance between the second electrode and the reflective layer in the plurality of sub-pixels is different;

[0060] The sub-pixel further includes a pixel definition layer, a driving circuit layer, and a transition portion, wherein the pixel definition layer is used to define a light-emitting area of ​​the sub-pixel; the driving circuit layer and the first electrode of the light-emitting structure layer are connected via the transition portion; and the orthographic projection of the transition portion on the base substrate falls within the orthographic projection of the pixel definition layer on the base substrate;

[0061] The plurality of sub-pixels include a first sub-pixel, a second sub-pixel, and a third sub-pixel, wherein the third sub-pixel includes a third transition portion, and an orthographic projection of the third transition portion on the base substrate is located in a gap between orthographic projections of the first sub-pixel and the second sub-pixel on the base substrate;

[0062] The third transfer portion includes a first electrode transfer layer and a second electrode transfer layer, wherein the second electrode transfer layer is located in a first via hole, and the first via hole passes through the pixel definition layer; the first electrode transfer layer is located on a side of the second electrode transfer layer away from the base substrate; the surface of the first electrode transfer layer close to the second electrode transfer layer is a convex arc surface, wherein the first electrode transfer layer includes a fifth side facing the first sub-pixel, and the fifth side has a third slope angle; the first electrode transfer layer also includes a sixth side facing the second sub-pixel, and the sixth side has a fourth slope angle,

[0063] Wherein, the fourth slope angle is greater than the third slope angle.

[0064] According to some exemplary embodiments, the pixel definition layer includes a third sidewall located around the first via hole, wherein at least a portion of the third sidewall is stepped.

[0065] On another aspect, a display panel is provided, characterized in that the display panel comprises the display substrate as described in any one of the above items.

[0066] In yet another aspect, a display device is provided, characterized in that the display device comprises the display substrate as described in any one of the above items or the display panel as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] The above contents and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0068] FIG1 is a schematic plan view of a display substrate according to an embodiment of the present disclosure;

[0069] FIG2 is a schematic plan view of a pixel unit according to some exemplary embodiments of the present disclosure, wherein the pixel unit includes four sub-pixels;

[0070] FIG3 is a partial cross-sectional schematic diagram taken along line AA′ in FIG2 ;

[0071] FIG4 is a partial cross-sectional schematic diagram of a pixel unit taken along line AA′ in FIG2 according to some exemplary embodiments of the present disclosure;

[0072] FIG5 is a partial cross-sectional schematic diagram of a pixel unit taken along line AA′ in FIG2 according to some exemplary embodiments of the present disclosure;

[0073] FIG6 is a partial cross-sectional schematic diagram of a pixel unit taken along line AA′ in FIG2 according to some exemplary embodiments of the present disclosure;

[0074] FIG7 is a partial cross-sectional schematic diagram of a pixel unit taken along line AA′ in FIG2 according to some exemplary embodiments of the present disclosure;

[0075] FIG8 is a partial enlarged view of the dotted line box S1 region in FIG7 , showing a stepped structure of the pixel definition layer;

[0076] FIG9 is a partial enlarged view of the dotted line frame S2 region in FIG7 , showing that the pixel definition layer has a stepped structure on the sidewall of the first via hole;

[0077] FIG10 is a schematic plan view of a pixel unit according to some exemplary embodiments of the present disclosure, wherein the pixel unit includes four sub-pixels;

[0078] FIG11 is a partial cross-sectional schematic diagram taken along line BB′ in FIG10 ;

[0079] FIG12 is a partial cross-sectional schematic diagram of a pixel unit taken along line AA′ in FIG2 according to some exemplary embodiments of the present disclosure;

[0080] FIG13 is a partial enlarged view of the dotted line frame S3 region in FIG12 , showing that the pixel definition layer has a stepped structure on the sidewall of the first via hole;

[0081] FIG14 is a partial cross-sectional schematic diagram of a pixel unit taken along line AA′ in FIG2 according to some exemplary embodiments of the present disclosure;

[0082] FIG15 is a partial enlarged view of the dotted line frame S4 ​​region in FIG14 , showing the first electrode transfer layer and the first electrode;

[0083] FIG16 is a schematic structural diagram of a display panel according to some embodiments of the present disclosure;

[0084] FIG17 is a schematic structural diagram of a display device according to some embodiments of the present disclosure.

[0085] It should be noted that, for the sake of clarity, in the drawings used to describe the embodiments of the present invention, the sizes of layers, structures or regions may be enlarged or reduced, that is, these drawings are not drawn according to the actual scale. DETAILED DESCRIPTION

[0086] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0087] It should be noted that in the drawings, the sizes and relative sizes of elements may be exaggerated for clarity and / or descriptive purposes. Thus, the sizes and relative sizes of the individual elements are not necessarily limited to those shown in the drawings. In the specification and drawings, the same or similar reference numerals indicate the same or similar parts.

[0088] Unless otherwise defined, technical or scientific terms used in this disclosure should have the ordinary meanings understood by those of ordinary skill in the art. The terms "first," "second," and similar terms used in this disclosure do not denote any order, quantity, or importance, but are simply used to distinguish different components. The terms "include," "comprising," and similar words mean that the element or object preceding the word encompasses the elements or objects listed after the word, and their equivalents, without excluding other elements or objects.

[0089] Unless otherwise specified, directional terms such as "upper," "lower," "left," "right," "inner," and "outer" are used herein to indicate positions or relationships based on the figures shown. These terms are intended solely to facilitate the description of the present disclosure and are not intended to indicate or imply that the devices, components, or parts referred to must have, be constructed, or operate in a specific orientation. It should be understood that when the absolute positions of the objects being described change, the relative positions they represent may also change accordingly. Therefore, these directional terms should not be construed as limiting the present disclosure.

[0090] In this article, "parallel" refers to a state where the angle formed by two straight lines is greater than -10° and less than 10°, and thus also includes a state where the angle is greater than -5° and less than 5°. Furthermore, "perpendicular" refers to a state where the angle formed by two straight lines is greater than 80° and less than 100°, and thus also includes a state where the angle is greater than 85° and less than 95°.

[0091] The term "about" in the present disclosure refers to a numerical value that is not strictly defined and allows for process and measurement errors.

[0092] It should be noted that, in this article, the term "same layer" refers to a layer structure formed by using the same film-forming process to form a film layer for forming a specific pattern, and then using the same mask to pattern the film layer through a single composition process. Depending on the specific pattern, a single composition process may include multiple exposure, development, or etching processes, and the specific pattern in the resulting layer structure may be continuous or discontinuous. In other words, multiple elements, components, structures, and / or parts located in the "same layer" are made of the same material and are formed through the same composition process. These specific patterns may also be at different heights or have different thicknesses.

[0093] In this document, unless otherwise specified, the expression "electrically connected" may mean that two components or elements are directly electrically connected, for example, component or element A is in direct contact with component or element B, and electrical signals can be transmitted between the two components; it may also mean that two components or elements are electrically connected through a conductive medium such as a conductive wire, for example, component or element A is electrically connected to component or element B through a conductive wire to transmit electrical signals between the two components or elements; it may also mean that two components or elements are electrically connected through at least one electronic component, for example, component or element A is electrically connected to component or element B through at least one thin-film transistor to transmit electrical signals between the two components or elements.

[0094] Those skilled in the art should understand that, in this article, unless otherwise specified, the expression "height" or "thickness" refers to the dimension of the surface of each film layer arranged perpendicular to the display substrate, that is, the dimension along the light emitting direction of the display substrate, or the dimension along the normal direction of the display device.

[0095] In this document, the directional expressions "first direction" and "second direction" are used to describe different directions of a pixel unit, for example, the longitudinal and transverse directions of a pixel unit, or the row and column directions of a pixel unit arrangement. It should be understood that such expressions are merely exemplary descriptions and are not intended to limit the present disclosure.

[0096] The brightness of silicon-based OLEDs is currently unable to meet the display requirements of AR / VR. In order to improve the display brightness of silicon-based OLEDs, strong microcavity structures are used in related technologies to enhance the brightness of display devices. However, due to the different cavity lengths of adjacent sub-pixels, the optical environments of adjacent sub-pixels are different, causing color deviation. In particular, when the transfer layer of the anode hole adopts a reflective metal structure, the display uniformity will be further affected. The sub-pixel size of silicon-based OLEDs is extremely small. For example, the size of silicon-based OLED sub-pixels is generally 5-10 microns. The sub-pixel size of mobile phone-sized OLEDs is usually tens of microns, while the sub-pixel size of large-size OLEDs even exceeds 100 microns. Since the sub-pixel size of silicon-based OLEDs is relatively small, the optical and electrical differences between adjacent sub-pixels cannot be ignored. The above optical or electrical differences will cause sub-pixel edge color deviation, seriously affecting the display effect.

[0097] An embodiment of the present disclosure provides a display substrate. The display substrate includes a plurality of pixel units arranged in an array, the pixel units include a plurality of sub-pixels, and the sub-pixels include: a base substrate; a reflective layer provided on the base substrate; and a microcavity adjustment layer and a light-emitting structure layer provided on a side of the reflective layer away from the base substrate, wherein the light-emitting structure layer includes a first electrode, a light-emitting layer, and a second electrode provided in sequence on the microcavity adjustment layer, and the distance between the second electrode and the reflective layer in the plurality of sub-pixels is different. The sub-pixels also include a pixel definition layer, a driving circuit layer, and a transition portion, wherein the pixel definition layer is used to define the light-emitting area of ​​the sub-pixel; the first electrode of the driving circuit layer and the light-emitting structure layer is connected via a transition portion; the orthographic projection of the transition portion on the base substrate falls within the orthographic projection of the pixel definition layer on the base substrate.

[0098] The plurality of sub-pixels include a first sub-pixel, a second sub-pixel, and a third sub-pixel, wherein the third sub-pixel includes a third transition portion, the orthographic projection of the third transition portion on the substrate being located in a gap between the orthographic projections of the first sub-pixel and the second sub-pixel on the substrate. The third transition portion includes a first electrode transition layer and a second electrode transition layer, wherein the second electrode transition layer is located in a first via hole that penetrates the pixel definition layer; the first electrode transition layer is located on a side of the second electrode transition layer away from the substrate; the first electrode transition layer includes a first portion, a second portion, and a third portion, wherein the second portion is electrically connected to the second electrode transition layer, the first portion is located on a first side of the second portion facing the first sub-pixel, and the first portion has a first slope angle; the third portion is located on a second side of the second portion facing the second sub-pixel, and the second portion has a second slope angle, wherein the second slope angle is greater than the first slope angle.

[0099] By setting different tilt angles on either side of the first and second adjacent sub-pixels, the first electrode transition layer can reflect light from the first and second sub-pixels differently, thereby reducing the impact of color shift and improving display uniformity across the display substrate. For example, if the red sub-pixel emits stronger light, adjusting the tilt angle of the first electrode transition layer can reduce the red light reflected into the red sub-pixel's luminous area, thereby resolving the reddish tint.

[0100] FIG. 1 is a schematic plan view of a display substrate according to an embodiment of the present disclosure.

[0101] For example, in some embodiments of the present disclosure, referring to FIG. 1 , a display substrate 100 includes a base substrate 1, which includes a display area AA and a non-display area NA, with the non-display area NA surrounding the display area AA. The display substrate 100 also includes a plurality of pixel units PX located in the display area AA of the base substrate. The plurality of pixel units PX are arranged in an array along a first direction X and a second direction Y in the display area AA.

[0102] Exemplarily, the substrate may include a silicon-based substrate, but is not limited thereto.

[0103] In the embodiments of the present disclosure, the display area AA may have various shapes. For example, the display area AA may be provided in various shapes, such as a closed polygon (e.g., a rectangle) with straight sides, a circle or an ellipse with curved sides, or a semicircle or a semiellipse with both straight and curved sides. In the embodiments of the present disclosure, the display area AA is provided as a quadrilateral with straight sides. It should be understood that this is merely an exemplary embodiment of the present disclosure and is not intended to limit the present disclosure.

[0104] The non-display area NA may surround the outer circumference of the display area AA. In an embodiment of the present disclosure, the non-display area NA may include a transverse portion extending in the first direction X and a longitudinal portion extending in the second direction Y.

[0105] The pixel unit PX is arranged in the display area AA. The pixel unit PX is the smallest unit for displaying an image. For example, the pixel unit PX may include a light-emitting device that emits white light and / or colored light. The pixel unit PX may be provided in plurality, arranged in a matrix form along rows extending in a first direction X and columns extending in a second direction Y. However, the embodiments of the present disclosure do not specifically limit the arrangement form of the pixel units PX, and the pixel units PX may be arranged in various forms. For example, the pixel units PX may be arranged so that the direction inclined relative to the first direction X and the second direction Y becomes the column direction, and the direction intersecting the column direction becomes the row direction.

[0106] A pixel unit PX may include multiple sub-pixels. For example, a pixel unit PX may include three sub-pixels, namely, a first sub-pixel, a second sub-pixel, and a third sub-pixel. For another example, a pixel unit PX may include four sub-pixels, namely, a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel. At least one sub-pixel may include a light-emitting element and a pixel driving circuit for driving the light-emitting element. The pixel driving circuit is electrically connected to the light-emitting element of the corresponding sub-pixel and can drive the light-emitting element of the sub-pixel to emit light of a corresponding color.

[0107] 2 is a schematic plan view of a pixel unit according to some exemplary embodiments of the present disclosure, showing that the pixel unit includes four sub-pixels; FIG. 3 is a schematic partial cross-sectional view taken along line AA′ in FIG. 2 .

[0108] By way of example, in an embodiment of the present disclosure, a pixel unit PX may include multiple sub-pixels SP. For example, referring to FIG. 2 , the pixel unit PX may include a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3. By way of example, the pixel unit PX may further include a fourth sub-pixel SP4. The multiple sub-pixels may emit light of different colors, for example, the first sub-pixel SP1 may emit green light, the second sub-pixel SP2 may emit red light, the third sub-pixel SP3 may emit blue light, and the fourth sub-pixel SP4 may emit white light. Alternatively, some of the multiple sub-pixels may emit light of the same color, for example, the first sub-pixel SP1 may emit green light, the second sub-pixel SP2 may emit red light, the third sub-pixel SP3 may emit blue light, and the fourth sub-pixel SP4 may emit blue light. In an embodiment of the present disclosure, the multiple sub-pixels are arranged in a cross-shaped arrangement. It should be understood that this is merely an exemplary embodiment of the present disclosure and is not intended to limit the present disclosure.

[0109] With reference to Figures 2 and 3 , a subpixel SP may include a light-emitting area LA, a pixel definition layer PDL, and a transition portion LN. The pixel definition layer PDL is used to define the light-emitting area LA of the subpixel. The orthographic projection of the transition portion LN onto the base substrate falls within the orthographic projection of the pixel definition layer PDL onto the base substrate. Figure 3 shows a combined cross-sectional view of a portion of the light-emitting area of ​​a first subpixel SP1, a portion of the light-emitting area of ​​a second subpixel SP2, and a portion of the non-light-emitting area of ​​a third subpixel SP3.

[0110] 3 , a sub-pixel may include a base substrate 1; a reflective layer 2 disposed on the base substrate 1; and a microcavity adjustment layer 3 and a light-emitting structure layer 4 disposed on the side of the reflective layer 2 away from the base substrate. The light-emitting structure layer 4 may include a first electrode 41, a light-emitting layer 42, and a second electrode 43 disposed sequentially on the microcavity adjustment layer. The first electrode 41 may be an anode, and the second electrode 43 may be a semi-transmissive cathode. The reflective layer 2 may include a first reflective sublayer 21 and a second reflective sublayer 22. For example, the material of the first reflective sublayer 21 may include titanium, and the material of the second reflective sublayer 22 may include aluminum. The material of the first electrode 41 may include a transparent conductive material such as ITO, and the material of the second electrode 43 may include a metal such as silver or aluminum, or an alloy such as a magnesium-aluminum alloy or a magnesium-silver alloy.

[0111] In order to improve the display brightness of the sub-pixels in silicon-based OLEDs, a strong microcavity structure design is adopted. When the distance h between the reflective electrode 2 and the second electrode 43 in the light-emitting area satisfies:

[0112] Where h is the cavity length, n is a positive integer, N is the effective refractive index in the microcavity, and λ is the central wavelength of the corresponding sub-pixel.

[0113] At this time, the outgoing light of the sub-pixel with the central wavelength λ is enhanced due to constructive interference, that is, the brightness is improved.

[0114] Exemplarily, the first sub-pixel SP1 is a sub-pixel that emits green light, and the second sub-pixel SP2 is a sub-pixel that emits red light. Since the wavelength of green light is shorter than that of red light, the distance between the reflective electrode 2 and the second electrode 43 in the light-emitting area of ​​the first sub-pixel SP1 is smaller than the distance between the reflective electrode 2 and the second electrode 43 in the light-emitting area of ​​the second sub-pixel SP2.

[0115] Exemplarily, the first sub-pixel SP1 is a sub-pixel that emits blue light, and the second sub-pixel SP2 is a sub-pixel that emits red light. Since the wavelength of blue light is shorter than that of red light, the distance between the reflective electrode 2 and the second electrode 43 in the light-emitting area of ​​the first sub-pixel SP1 is smaller than the distance between the reflective electrode 2 and the second electrode 43 in the light-emitting area of ​​the second sub-pixel SP2.

[0116] Exemplarily, the first sub-pixel SP1 is a sub-pixel that emits blue light, and the second sub-pixel SP2 is a sub-pixel that emits green light. Since the wavelength of blue light is shorter than that of green light, the distance between the reflective electrode 2 and the second electrode 43 in the light-emitting area of ​​the first sub-pixel SP1 is smaller than the distance between the reflective electrode 2 and the second electrode 43 in the light-emitting area of ​​the second sub-pixel SP2.

[0117] 3 , the sub-pixel further includes a driving circuit layer 50 . The driving circuit layer 50 may be electrically connected to the first electrode of the sub-pixel, such as the first electrode 413 of the third sub-pixel, to drive the corresponding sub-pixel to emit light.

[0118] For example, at least one layer of the driving circuit layer 50 is located on the same layer as the reflective layer 2. This design can reduce the number of film layers, simplify the manufacturing process, and save costs. For example, the driving circuit layer 50 also has a certain reflective effect on light.

[0119] Exemplarily, at least a portion of the driving circuit layer 50 is located in the non-light-emitting area.

[0120] It should be noted that due to the presence of the pixel definition layer, for the same sub-pixel, the distance between the reflective electrode 2 and the second electrode 43 and the distance between the drive circuit layer 50 and the second electrode 43 may be different in the light-emitting area and the non-light-emitting area. For example, for the third sub-pixel SP3, the distance between the drive circuit layer 50 and the second electrode 43 in the non-light-emitting area may be greater than the distance between the reflective electrode 2 and the second electrode 43 in the light-emitting area.

[0121] In the related art, for silicon-based OLED display substrates, in order to avoid the influence of water and oxygen in the organic layer on the performance of OLED devices, both the pixel definition layer and the microcavity adjustment layer adopt an inorganic insulating layer, such as a SiOx / SiNx structure. However, the slope angle of the inorganic insulating layer is relatively large. If the first electrode located above the inorganic insulating layer is directly connected to the driving circuit layer through a via, the film layer of the first electrode may be easily broken due to the large step difference. Generally, an electrical connection between the first electrode and the underlying driving circuit layer is achieved by adding a first electrode transition layer. For example, referring to Figure 3, the driving circuit layer 50 in the third sub-pixel SP3 and the first electrode 413 of the light-emitting structure layer in the third sub-pixel SP3 are connected through a transition portion LN (for example, a third transition portion LN3).

[0122] Since the central wavelength λ of the light emitted by sub-pixels emitting light of different colors is different, in order to ensure the microcavity enhancement effect of the sub-pixels, the distance between the second electrode 43 and the reflective layer 2 in at least some sub-pixels is different. For example, the cavity length (the distance between the second electrode 43 and the reflective layer 2) of the first sub-pixel SP1 in Figure 3 is different from the cavity length of the second sub-pixel SP2. Since the first electrode transition layer is a reflective metal structure, it will reflect the light of adjacent sub-pixels. For example, the material of the first electrode transition layer may include metallic titanium. Due to the different cavity lengths of the microcavities on both sides of the first electrode transition layer, the optical environment of adjacent sub-pixels at this position is different, which can easily cause color deviation.

[0123] In some embodiments of the present disclosure, the first electrode transition layer is optimized to reduce or even eliminate color shift. For example, referring to Figures 2 and 3 , a plurality of subpixels include a first subpixel SP1, a second subpixel SP2, and a third subpixel SP3. The third subpixel SP3 includes a third transition portion LN3, the orthographic projection of which on the substrate is located in the gap between the orthographic projections of the first subpixel SP1 and the second subpixel SP2. The third transition portion LN3 includes a second electrode transition layer LN31 and a first electrode transition layer LN32. The second electrode transition layer LN31 is located in a first via VH1, which extends through the pixel definition layer PDL. The first electrode transition layer LN32 is located on the side of the second electrode transition layer LN31 away from the substrate. The first electrode transition layer LN32 includes a first portion LN321, a second portion LN322, and a third portion LN323. The second portion LN322 is electrically connected to the second electrode transition layer LN31. The first portion LN321 is located on a first side of the second portion LN322 facing the first sub-pixel SP1, and the first portion LN321 has a first slope angle α1. The third portion LN323 is located on a second side of the second portion LN322 facing the second sub-pixel SP2, and the second portion LN322 has a second slope angle α2, where the second slope angle α2 is greater than the first slope angle α1.

[0124] By designing the second slope angle α2 to be greater than the first slope angle α1, the first electrode transition layer LN32 can reflect more light from above the first electrode transition layer LN32 into the first sub-pixel SP1. For example, if the first sub-pixel SP1 is green and the second sub-pixel SP2 is red, the design of the second slope angle α2 being greater than the first slope angle α1 can ensure that more green light is reflected into the first sub-pixel's light-emitting area than red light is reflected into the second sub-pixel's light-emitting area, thereby resolving the red cast issue.

[0125] The first electrode transfer layer is set with different inclination angles on both sides and the inclination angle can be adjusted according to the actual color deviation situation to ensure that the sub-pixels with stronger light intensity are reflected less by the first electrode transfer layer to the corresponding sub-pixel light-emitting area, and the sub-pixels with weaker light intensity are reflected more by the first electrode transfer layer to the corresponding sub-pixel light-emitting area, thereby balancing the light intensity of each sub-pixel, reducing or even eliminating the color deviation phenomenon, and thus improving the display effect of the display substrate.

[0126] For example, in some embodiments of the present disclosure, the absolute value of the difference between the first slope angle and the second slope angle is greater than or equal to 2° and less than or equal to 20°.

[0127] Exemplarily, the orthographic projection of the first portion LN321 on the base substrate does not overlap with the orthographic projection of the first via hole VH1 on the base substrate, and / or the orthographic projection of the third portion LN323 on the base substrate does not overlap with the orthographic projection of the first via hole VH1 on the base substrate.

[0128] Exemplarily, the orthographic projection of the second portion LN322 on the substrate at least partially overlaps with the orthographic projection of the first via hole VH1 on the substrate. For example, the orthographic projection of the second portion LN322 on the substrate completely overlaps with the orthographic projection of the first via hole VH1 on the substrate. Alternatively, the orthographic projection of the first via hole VH1 on the substrate falls within the orthographic projection of the second portion LN322 on the substrate.

[0129] Illustratively, the second portion LN322 may be substantially parallel to the base substrate 1. For example, "parallel" means that the angle formed by the two straight lines is greater than -10° and less than 10°, or the angle formed by the two straight lines is greater than -5° and less than 5°.

[0130] In this way, the flatness of the bottom of the first electrode transition layer in the via hole region can be ensured, thereby improving the overlap between the second electrode transition layer LN31 and the first electrode transition layer LN32, and improving the overlap between the first electrode transition layer LN32 and the first electrode 41. For example, the overlap between the first electrode transition layer LN32 and the first electrode 413 in the third sub-pixel SP3 can be improved.

[0131] FIG. 4 is a partial cross-sectional schematic diagram of a pixel unit taken along line AA′ in FIG. 2 according to some exemplary embodiments of the present disclosure.

[0132] 4 , in some embodiments of the present disclosure, the third sub-pixel SP3 may further include a driving circuit layer 50. For example, at least a portion of the driving circuit layer 50 is located in the same layer as the reflective layer 2.

[0133] The orthographic projection of the third transition portion LN3 on the base substrate falls within the orthographic projection of the drive circuit layer 50 on the base substrate. Both the drive circuit layer 50 and the first electrode transition layer 32 can reflect light from adjacent sub-pixels. By optimizing the structures of the drive circuit layer 50 and the first electrode transition layer 32, color shift between adjacent sub-pixels can be reduced.

[0134] 4 , the orthographic projection of the driving circuit layer 50 on the base substrate protrudes by a first protrusion distance d1 in a direction approaching the first sub-pixel SP1 relative to the orthographic projection of the third adapter LN3 on the base substrate. The orthographic projection of the driving circuit layer 50 on the base substrate protrudes by a second protrusion distance d2 in a direction approaching the second sub-pixel SP2 relative to the orthographic projection of the third adapter LN3 on the base substrate, wherein the first protrusion distance d1 is greater than the second protrusion distance d2.

[0135] By setting the non-overlapping widths of the first electrode transition layer and the driver circuit layer to be different, the display color shift problem can be improved. For example, if the first subpixel SP1 emits green light and the second subpixel SP2 emits red light, the first protrusion distance d1 near the first subpixel SP1 is greater than the second protrusion distance d2 near the second subpixel SP2. This ensures that more light from beneath the first electrode transition layer is reflected into the first subpixel, thereby reducing the reddish cast problem.

[0136] Exemplarily, the first protrusion distance d1 is greater than or equal to 0.1 micrometer and less than or equal to 0.3 micrometer, and / or the second protrusion distance d2 is greater than or equal to 0.1 micrometer and less than or equal to 0.3 micrometer.

[0137] It should be noted that the width of the non-overlapping portion of the first electrode transfer layer and the driving circuit layer can be adjusted according to the actual color deviation to ensure that the sub-pixels with stronger light intensity reflect less light to the corresponding sub-pixel light-emitting area by both the first electrode transfer layer and the driving circuit layer, and the sub-pixels with weaker light intensity reflect more light to the corresponding sub-pixel light-emitting area by both the first electrode transfer layer and the driving circuit layer, thereby balancing the light intensity of each sub-pixel, reducing or even eliminating the color deviation phenomenon, and improving the display effect of the display substrate.

[0138] It should also be noted that the tilt angle of the first electrode transition layer can be designed to adjust the reflection of light above the first electrode transition layer, and the width of the non-overlap between the first electrode transition layer and the driver circuit layer can be designed to adjust the reflection of light below the first electrode transition layer. To ensure consistency in the optical adjustment effects of the driver circuit layer and the first electrode transition layer, the tilt angle of the first electrode transition layer and the non-overlap width between the first electrode transition layer and the driver circuit layer can be set within a certain range, thereby improving the overall color shift of the display substrate.

[0139] For example, in some embodiments of the present disclosure, with continued reference to FIG4 , the ratio of the absolute value of the difference between the second slope angle α2 and the first slope angle α1 to the second slope angle α2 is the slope angle difference ratio n1. That is, the slope angle difference ratio n1 = |α2 - c1| / α2. The ratio of the absolute value of the difference between the first protrusion distance d1 and the second protrusion distance d2 to the second protrusion distance d2 is the protrusion distance difference ratio n2. That is, the protrusion distance difference ratio n2 = |d2 - d1| / d2. The absolute value of the difference between the slope angle difference ratio n1 and the protrusion distance difference ratio n2 is greater than or equal to 1% and less than or equal to 10%. That is, 1% ≤ |n1 - n2| ≤ 10%. Wherein, α2 > 0, d2 > 0.

[0140] By comprehensively designing the slope angle difference ratio of the first electrode transition layer and the protrusion distance difference ratio of the non-overlapping width between the first electrode transition layer and the driving circuit layer, the overall color deviation of the display substrate can be improved, which is beneficial to improving the display effect.

[0141] For example, in some embodiments of the present disclosure, referring to FIG4 , the second portion LN322 of the first electrode transition layer in the third subpixel SP3 is spaced apart from the surface of the substrate 1 by a tenth spacing distance h10 from the surface of the substrate 1 near the light-emitting structure layer. The first electrode 411 in the first subpixel SP1 is spaced apart from the surface of the substrate 1 by an eleventh spacing distance h11 from the surface of the substrate 1 near the light-emitting structure layer. The tenth spacing distance h10 is greater than the eleventh spacing distance h11. The first electrode 412 in the second subpixel SP2 is spaced apart from the surface of the substrate 1 by a twelfth spacing distance h12 from the surface of the substrate 1 near the light-emitting structure layer. The tenth spacing distance h10 is greater than the twelfth spacing distance h12.

[0142] By designing the surface of the second portion LN322 in contact with the first electrode 413 in the third sub-pixel SP3 to be higher than the surface of the first electrode of the adjacent sub-pixel (for example, the surface of the first electrode 411 of the first sub-pixel SP1 or the surface of the first electrode 412 of the second sub-pixel SP2), the first electrode transition layer can prevent optical crosstalk between adjacent sub-pixels, which is beneficial to improving the display effect of the display panel.

[0143] In the embodiments of the present disclosure, to further improve the color shift problem, the color shift can be reduced by adjusting the light-emitting area of ​​the sub-pixel. For example, the reddish cast problem common in silicon-based OLED display substrates can be addressed by reducing the light-emitting area of ​​the red sub-pixel edge region to weaken the edge red light, thereby reducing the color shift and improving display uniformity. Figure 5 is a partial cross-sectional schematic diagram of a pixel unit according to some exemplary embodiments of the present disclosure, taken along line AA' in Figure 2.

[0144] For example, in an embodiment of the present disclosure, referring to FIG. 5 , the first sub-pixel SP1 includes a first reflective layer 201, and the second sub-pixel SP2 includes a second reflective layer 202. The orthographic projection of the first reflective layer 201 on the substrate at least partially overlaps with the orthographic projection of the pixel definition layer PDL on the substrate. The overlapping portion of the projections of the first reflective layer 201 and the pixel definition layer PDL has a first width d3. The orthographic projection of the second reflective layer 202 on the substrate at least partially overlaps with the orthographic projection of the pixel definition layer PDL on the substrate. The overlapping portion of the projections of the second reflective layer 202 and the pixel definition layer PDL has a second width d4. The second width d4 is greater than the first width d3.

[0145] By adjusting the overlap width between the edge of the pixel definition layer and the edge of the reflective layer in the sub-pixel, the light-emitting area at the edge of the sub-pixel can be adjusted. For example, if the first sub-pixel SP1 emits green light and the second sub-pixel SP2 emits red light, the overlap width between the edge of the pixel definition layer PDL and the side of the second reflective layer 202 in the second sub-pixel SP2 can be larger. This can reduce the reflection of red light in the edge area, thereby reducing color shift and improving display uniformity.

[0146] Exemplarily, the first width d3 is greater than or equal to 0.1 micrometer and less than or equal to 0.3 micrometer, and / or the second width d4 is greater than or equal to 0.1 micrometer and less than or equal to 0.3 micrometer.

[0147] FIG. 6 is a partial cross-sectional schematic diagram of a pixel unit taken along line AA′ in FIG. 2 according to some exemplary embodiments of the present disclosure.

[0148] The inventors have discovered that sub-pixel edge areas are a significant factor in uneven illumination. In addition to improving this uneven illumination by adjusting the overlap width between the sub-pixel's reflective layer and the pixel definition layer, thereby regulating the sub-pixel's luminous area, in the disclosed embodiments, as shown in FIG6 , a raised structure can be provided at the edge of the sub-pixel's first electrode to reduce edge light, thereby optimizing color shift and improving display uniformity.

[0149] For example, the first electrode 41 may include a main portion 4101 and an edge portion 4102. The orthographic projection of the edge portion 4102 on the base substrate at least partially overlaps with the orthographic projection of the pixel definition layer (PDL) on the base substrate. The main portion 4101 has a first thickness h1, and the edge portion 4102 has a second thickness h2. The first thickness h1 is less than the second thickness h2, thereby forming a protruding structure at the edge of the first electrode.

[0150] By providing a protrusion at the edge of the first electrode of the sub-pixel, the edge light can be weakened, thereby improving the unevenness of the edge light of the sub-pixel and improving the display uniformity.

[0151] It should be noted that in the embodiments of the present disclosure, the relative size of the width of the raised edge of the first electrode and the overlapping width of the first electrode and the pixel definition layer is not limited. For example, the width of the raised edge can be the same as the overlapping width of the first electrode and the pixel definition layer. Alternatively, the width of the raised edge can be less than the overlapping width of the first electrode and the pixel definition layer. Alternatively, the width of the raised edge can be greater than the overlapping width of the first electrode and the pixel definition layer.

[0152] For example, in some embodiments of the present disclosure, with continued reference to FIG. 6 , the pixel definition layer PDL further includes a second via hole VH2. The orthographic projection of the first via hole VH1 on the base substrate falls within the orthographic projection of the second via hole VH2 on the base substrate. The first electrode 413 of the third subpixel SP3 includes a first sub-electrode 4131 located in the first via hole VH1 and a second sub-electrode 4132 located in the second via hole VH2. The first sub-electrode 4131 and the second sub-electrode 4132 form a groove electrode.

[0153] By designing two vias in a stacked manner on the pixel definition layer, with the size of the second via being larger than that of the first via, the flatness of the groove electrode can be improved, which is conducive to forming a good connection between the groove electrode and the second electrode transfer layer. The size of the groove electrode can also be increased, which is conducive to improving the conductivity of the groove electrode and improving the uniformity of the display substrate.

[0154] FIG. 7 is a partial cross-sectional schematic diagram of a pixel unit taken along line AA′ in FIG. 2 according to some exemplary embodiments of the present disclosure.

[0155] For example, in some embodiments of the present disclosure, the raised thickness of the raised edge of the first electrode included in different sub-pixels may be different. For example, referring to Figure 7, the first electrode 411 of the first sub-pixel SP1 includes a first edge portion 4112, and the first edge portion 4112 has a third thickness h3. The first electrode 412 of the second sub-pixel SP2 includes a second edge portion 4122, and the second edge portion 4122 has a fourth thickness h4. The third thickness h3 is less than the fourth thickness h4. The higher the raised structure, the more significant the effect of attenuating edge light. By designing different raised heights of the first electrode edges of different sub-pixels, the edge light intensity of different sub-pixels can be adjusted, thereby reducing or even eliminating the uneven edge light emission phenomenon, thereby improving the display effect of the display substrate.

[0156] For example, when the first sub-pixel SP1 is a sub-pixel that emits green light and the second sub-pixel SP2 is a sub-pixel that emits red light, by setting the height of the first electrode edge protrusion structure of the red sub-pixel to be higher than the height of the first electrode edge protrusion of the green sub-pixel, the attenuation effect of the edge light of the red sub-pixel is made stronger, thereby improving the problem of the display being reddish.

[0157] In order to improve the display brightness of sub-pixels in silicon-based OLEDs, a strong micro-cavity structure design is adopted. For sub-pixels emitting light of different colors, the length of the cavity is different because the central wavelength of the emitted light is different.

[0158] For example, in an embodiment of the present disclosure, with continued reference to FIG. 7 , the first sub-pixel SP1 may include a first reflective layer 201 and a second electrode 431. The second electrode 431 of the first sub-pixel SP1, which is close to the first surface 4310 of the substrate, is spaced a first distance h5 from the first reflective layer 201, which is away from the second surface 2010 of the substrate. The first distance h5 may be the cavity length of the strong microcavity structure in the first sub-pixel SP1.

[0159] The second sub-pixel SP2 may include a second reflective layer 202 and a second electrode 432. The second electrode 432 of the second sub-pixel SP2, which is close to the third surface 4320 of the substrate, is separated from the second reflective layer 202 by a second spacing distance h6, which is away from the fourth surface 2020 of the substrate. The second spacing distance h6 may be the cavity length of the strong microcavity structure in the second sub-pixel SP2.

[0160] Exemplarily, the first spacing distance h5 is smaller than the second spacing distance h6. For example, if the first subpixel SP1 emits green light and the second subpixel emits red light, and the central wavelength of red light is greater than that of green light, to improve brightness uniformity across the subpixels, the cavity length of the strong microcavity structure of the red-emitting subpixel can be greater than that of the green-emitting subpixel. That is, the second spacing distance h6 is greater than the first spacing distance h5. This minimizes the brightness differences between the subpixels after the strong microcavity structure enhances brightness, thereby improving display uniformity across the display substrate.

[0161] In order to adjust the cavity length of the strong microcavity structure in each sub-pixel, in the embodiments of the present disclosure, multiple sub-pixels may further include a microcavity adjustment layer. For example, with continued reference to FIG7 , the first sub-pixel SP1 may further include a first microcavity adjustment layer 31, and the second sub-pixel SP2 may further include a second microcavity adjustment layer 32. The thickness of the first microcavity adjustment layer 31 is less than the thickness of the second microcavity adjustment layer 32. By adjusting the thickness of the microcavity adjustment layer in the sub-pixel, the cavity length of the strong microcavity structure in the sub-pixel can be adjusted, thereby making the brightness improvement effect of the strong microcavity structure more significant.

[0162] FIG8 is a partial enlarged view of the dotted-line box S1 region in FIG7 , showing the stepped structure of the pixel definition layer.

[0163] The pixel definition layer in a silicon-based OLED is usually formed of inorganic materials, for example, materials such as SiOx / SiNx. Since the step difference of the pixel definition layer is too high, the cathode layer (for example, the second electrode) may be broken, affecting the stability of the device. In order to reduce the impact of the step difference of the pixel definition layer on the device, in some embodiments of the present disclosure, with reference to Figure 8, the edge of the pixel definition layer near the light-emitting area may include a stepped structure PDL10. Exemplarily, the pixel definition layer may include a plurality of stacked pixel definition sublayers. By adjusting the preparation process of the plurality of pixel definition sublayers, the plurality of pixel definition sublayers form a pixel definition layer having a plurality of stepped structures. For example, the etching mask pattern of at least a portion of each pixel definition sublayer can be designed to be different, or the etching time of at least a portion of each pixel definition sublayer can be designed to be different, or the etching rate of at least a portion of each pixel definition sublayer can be designed to be different, so that the pixel definition sublayer farther away from the substrate substrate has a smaller positive projection area on the substrate substrate, thereby forming a pixel definition layer having a plurality of stepped structures.

[0164] By designing the pixel definition layer to include multiple step structures, the step difference of the film layer of the second electrode located above the pixel definition layer can be reduced, thereby avoiding the breakage of the film layer of the second electrode, which is beneficial to improving the uniformity of the electric field at the edge of the pixel, thereby improving the display uniformity of the display substrate.

[0165] For example, in an embodiment of the present disclosure, the pixel definition layer may include different numbers of steps near the edges of different sub-pixel light-emitting areas. For example, referring again to FIG. 7 , the pixel definition layer PDL may include a first sidewall PDL01 near the first sub-pixel SP1 and a second sidewall PDL02 near the second sub-pixel SP2. The number of steps on the first sidewall PDL01 is greater than the number of steps on the second sidewall PDL02.

[0166] It should be noted that the number of steps of the pixel definition layer near the edge of the sub-pixel light-emitting area can be specifically designed according to actual needs, and the embodiments of the present disclosure do not specifically limit this.

[0167] FIG9 is a partial enlarged view of the dotted-line frame S2 region in FIG7 , showing that the pixel definition layer has a step-like structure on the sidewall of the first via hole.

[0168] For example, in some embodiments of the present disclosure, with reference to FIG7 and FIG9 , the pixel definition layer PDL may further include a third sidewall PDL03 located around the first via hole VH1. At least a portion of the third sidewall PDL03 may have a stepped shape. For example, the portion of the third sidewall PDL03 that contacts the first electrode 413 of the third sub-pixel SP3 may have a stepped shape. By designing at least a portion of the sidewall of the pixel definition layer at the first via hole to have a stepped shape, the slope angle of the first electrode at the first via hole can be reduced, thereby reducing the risk of fracture of the first electrode and improving device reliability.

[0169] 10 is a schematic plan view of a pixel unit according to some exemplary embodiments of the present disclosure, showing that the pixel unit includes four sub-pixels; FIG. 11 is a schematic partial cross-sectional view taken along line BB′ in FIG. 10 .

[0170] In addition to optical differences causing color shift at the first via hole VH1, electrical differences can also cause display non-uniformity. Because the first electrode transition layer is configured with different inclination angles, the distances between the edge of the first electrode transition layer and the first electrodes of different color subpixels vary, generating electrical differences that can cause display non-uniformity. For example, referring to Figure 11 , the first portion LN321 is separated from the first edge 4112 of the first electrode 411 in the first subpixel SP1 by a fifth spacing distance d5. The third portion LN323 is separated from the second edge 4122 of the first electrode 412 in the second subpixel SP2 by a sixth spacing distance d6. The fifth spacing distance d5 affects the electrical performance of the first subpixel SP1, while the sixth spacing distance d6 affects the electrical performance of the second subpixel SP2.

[0171] To reduce electrical variability between different subpixels, in an embodiment of the present disclosure, with reference to Figures 10 and 11 , the center of the first via hole VH1 can be moved toward the second subpixel SP2, that is, closer to the second subpixel SP2. For example, the inclination angle (e.g., second slope angle α2) of the third portion LN323 in the first electrode transition layer is greater than the inclination angle (e.g., first slope angle α1) of the first portion, and this inclination angle affects the fifth spacing distance d5 and the sixth spacing distance d6. To balance the electrical effects of the fifth spacing distance d5 and the sixth spacing distance d6 on the first subpixel SP1 and the second subpixel SP2, the center of the first via hole VH1 is moved toward the second subpixel SP2. For example, with reference to Figure 10 , the first via hole VH1 is separated from the first subpixel SP1 by a seventh spacing distance d7, and the first via hole VH1 is separated from the second subpixel SP2 by an eighth spacing distance d8. The seventh spacing distance d7 is greater than the eighth spacing distance d8. By moving the first via hole VH1 toward the second sub-pixel, the electrical difference between adjacent sub-pixels caused by the different tilt angles of the first electrode transfer layer can be reduced or even eliminated, thereby improving display uniformity.

[0172] For example, in some embodiments of the present disclosure, to balance the electrical effects of the fifth spacing distance d5 and the sixth spacing distance d6 on the first sub-pixel SP1 and the second sub-pixel SP2, the second electrode transition layer LN31 located in the first via hole VH1 may also be moved toward the second sub-pixel SP2. For example, referring to FIG11 , the drive circuit layer 50 includes a first side 2031 proximate to the first sub-pixel SP1 and a second side 2032 proximate to the second sub-pixel SP2. The first via hole VH1 includes a third side VH11 proximate to the first sub-pixel SP1 and a fourth side VH12 proximate to the second sub-pixel SP2. The first side 2031 and the third side VH11 are separated by a third spacing distance d9, and the second side 2032 and the fourth side VH12 are separated by a fourth spacing distance d10, where the third spacing distance d9 is greater than the fourth spacing distance d10.

[0173] By adjusting the center position of the first via hole to adapt to the inclination angle of the first electrode transfer layer, the distance from the first electrode transfer layer to the first electrode of the adjacent sub-pixel is made the same. For example, the fifth spacing distance d5 is basically equal to the sixth spacing distance d6, thereby reducing the electrical difference between the first sub-pixel and the second sub-pixel in the area near the first via hole, which is beneficial to improving the uniformity of the display substrate.

[0174] Exemplarily, the third spacing distance d9 is greater than or equal to 0.2 micrometers and less than or equal to 0.8 micrometers; and / or the fourth spacing distance d10 is greater than or equal to 0.2 micrometers and less than or equal to 0.8 micrometers.

[0175] 12 is a partial cross-sectional view of a pixel unit taken along line AA' in FIG. 2 according to some exemplary embodiments of the present disclosure.

[0176] For example, in some embodiments of the present disclosure, with reference to FIG1 , FIG2 , and FIG12 , a display substrate 100 may include a plurality of pixel units PX arranged in an array. A pixel unit PX may include a plurality of sub-pixels SP. For example, a pixel unit PX may include a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3. The pixel unit PX may also include a fourth sub-pixel SP4. A sub-pixel may include a light-emitting area LA, a pixel definition layer PDL, and a transition portion LN. The pixel definition layer PDL is used to define the light-emitting area LA of the sub-pixel. The orthographic projection of the transition portion LN on the base substrate falls within the orthographic projection of the pixel definition layer PDL on the base substrate.

[0177] A subpixel may include a base substrate 1; a reflective layer 2 disposed on the base substrate 1; and a microcavity adjustment layer 3 and a light-emitting structure layer 4 disposed on the side of the reflective layer 2 away from the base substrate. The light-emitting structure layer 4 includes a first electrode 41, a light-emitting layer 42, and a second electrode 43 disposed sequentially on the microcavity adjustment layer 3. The first electrode 41 may be an anode, and the second electrode 43 may be a transflective cathode. The reflective layer 2 may include a first reflective sublayer 21 and a second reflective sublayer 22. For example, the material of the first reflective sublayer 21 may include titanium, and the material of the second reflective sublayer 22 may include aluminum. The material of the first electrode 41 may include indium tin oxide (ITO), and the material of the second electrode 43 may include a metal such as silver or aluminum, or an alloy such as a magnesium-aluminum alloy or a magnesium-silver alloy. The subpixel may also include a driving circuit layer 50. The driving circuit layer 50 and the first electrode 41 of the light-emitting structure layer 4 may be connected via a transition portion LN. The distance between the second electrode 43 and the reflective layer 2 may vary across multiple subpixels. For example, at least one layer of the driving circuit layer 50 may be co-located with the reflective layer 2.

[0178] Continuing with FIG12 , the plurality of sub-pixels includes a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3. The third sub-pixel SP3 includes a third transition portion LN3, the orthographic projection of which on the substrate is located in the gap between the orthographic projections of the first sub-pixel SP1 and the second sub-pixel SP2. The third transition portion LN3 includes a second electrode transition layer LN31 and a first electrode transition layer LN32. The second electrode transition layer LN31 is located in a first via hole VH1, which extends through the pixel definition layer PDL. The first electrode transition layer LN32 is located on a side of the second electrode transition layer LN31 that is away from the substrate. The surface of the first electrode transition layer LN32 adjacent to the second electrode transition layer LN31 is a convex curved surface. The first electrode transition layer LN32 includes a fifth side LN325 facing the first sub-pixel SP1, with the fifth side LN325 having a third slope angle α3. The first electrode transition layer LN32 further includes a sixth side LN326 facing the second sub-pixel SP2 , and the sixth side LN326 has a fourth slope angle α4 , wherein the fourth slope angle α4 is greater than the third slope angle α3 .

[0179] By designing the fourth slope angle α4 to be greater than the third slope angle α3, the first electrode transition layer LN32 can reflect more light into the first sub-pixel SP1. For example, when the first sub-pixel SP1 is green and the second sub-pixel SP2 is red, the red cast problem can be solved.

[0180] The first electrode transfer layer is set to an arc-shaped structure in the overlapping area (for example, the area near the first via hole). In this way, the angle design of the overlapping area can be used to adjust the optical difference. Only a smaller anode via hole (for example, the first via hole) is required to achieve the effect of improving color deviation, which is beneficial to improving the aperture ratio of the display substrate.

[0181] FIG13 is a partial enlarged view of the dotted-line box S3 region in FIG12 , showing that the pixel definition layer has a stepped structure on the sidewall of the first via hole.

[0182] For example, in the embodiments of the present disclosure, with reference to FIG12 and FIG13 , in order to ensure the arc-shaped overlap effect of the first electrode transition layer LN32, the inorganic layer in contact with the first electrode transition layer LN32 can be designed as a multi-layer stepped structure, so that an inorganic insulating layer can be used to achieve a similar arc-shaped structure effect. For example, the inorganic layer located below the first electrode transition layer can include multiple inorganic sub-layers. Through multiple patterning processes, multiple stepped structures PDL20 are formed on the sidewalls of the pixel definition layer near the first via region. In this way, a multi-step structure LN320 can also be formed on the surface of the first electrode transition layer in this region, thereby improving the overlap between the first electrode of the sub-pixel and the first electrode transition layer, and improving the reliability of the display substrate.

[0183] For example, the number of steps in the inorganic layer in contact with the first electrode transition layer may be different. For example, the number of steps in the inorganic layer near the first sub-pixel may be different from the number of steps in the inorganic layer near the second sub-pixel.

[0184] By way of example, in some embodiments of the present disclosure, referring to FIG. 3 , the second electrode transition layer LN31 and the first electrode transition layer LN32 may be two components formed separately in two different patterning process steps. For example, in some embodiments, the display panel may include a silicon-based substrate, and the second electrode transition layer LN31 may be a conductive connecting pillar formed separately in the first via hole VH1, such as a tungsten conductive pillar formed in the first via hole VH1. By way of example, in a silicon-based display panel, the first via hole may have a relatively large depth, and the separate formation of the tungsten conductive pillar can ensure a good electrical connection between the first electrode transition layer and the underlying drive circuit layer.

[0185] For example, in some embodiments of the present disclosure, the second electrode transfer layer and the first electrode transfer layer can be an integral structure formed in the same patterning process. In some embodiments, the depth of the first via can be relatively shallow, and a second electrode transfer layer connected to the first electrode transfer layer can be formed simultaneously with the formation of the first electrode transfer layer through a single patterning process. For example, the second electrode transfer layer and the first electrode transfer layer can be formed by depositing the same conductive material, with a portion of the conductive material extending into the first via VH1 to form the second electrode transfer layer, while another portion of the conductive material forms the first electrode transfer layer.

[0186] FIG. 14 is a partial cross-sectional schematic diagram of a pixel unit taken along line AA′ in FIG. 2 according to some exemplary embodiments of the present disclosure.

[0187] For example, in some embodiments of the present disclosure, referring to Figure 14, the second electrode transition layer LN31 is located in the first via hole VH1, and the second electrode transition layer LN31 can be formed in the same composition process as the first electrode transition layer LN32, that is, the second electrode transition layer LN31 can be formed by extending a portion of the first electrode transition layer LN32 into the first via hole VH1, and then electrically connected to the driving circuit layer 50.

[0188] 14 and 15 , at least a portion of the first electrode 413 in the third subpixel SP3 may be disposed in the third via hole VH3. For example, the first electrode 413 in the third subpixel SP3 includes a first conductive portion 4131 disposed in the third via hole VH3 and electrically connected to the second portion LN322 of the first electrode switching layer LN32.

[0189] The orthographic projection of the first via VH1 on the substrate does not overlap with the orthographic projection of the third via VH3 on the substrate. By staggering the first and third vias VH1 and VH3, the step difference of the film near the first and third vias VH1 and VH3 can be reduced, which is beneficial for improving the film quality of the first electrode transition layer and enhancing the stability of the device.

[0190] FIG15 is a partial enlarged view of the dotted-line frame S4 ​​region in FIG14 , showing the first electrode switching layer and the first electrode.

[0191] For example, in some embodiments of the present disclosure, referring to FIG15 , the first electrode transition layer LN32 is electrically connected to the first electrode 413 in the third sub-pixel. At least a portion of the first electrode 413 in the third sub-pixel has a protruding structure facing away from the base substrate. For example, the first electrode 413 includes a first conductive portion 4131 and a second conductive portion 4132. The first conductive portion 4131 is located in the third via hole VH3, and the orthographic projection of the second conductive portion 4132 on the base substrate does not overlap with the orthographic projection of the third via hole VH3 on the base substrate. In other words, the first electrode 413 in the third sub-pixel includes a first conductive portion 4131 located in the third via hole VH3 and a second conductive portion 4132 located outside the third via hole VH3.

[0192] The first conductive portion 4131 includes a raised structure 4133 facing away from the substrate. The raised structure 4133 has a thickness of h13. The second conductive portion 4132 has a thickness of h14. The raised structure's thickness h13 is less than the thickness h14 of the second conductive portion 4132. The design of the raised structure increases the lateral resistance of the organic light-emitting layer in this region, reducing lateral crosstalk between adjacent sub-pixels.

[0193] FIG16 is a schematic structural diagram of a display panel according to some embodiments of the present disclosure.

[0194] Optionally, referring to FIG. 16 , an embodiment of the present disclosure further provides a display panel 200 , which may include the display substrate 100 described in any one of the above embodiments.

[0195] FIG17 is a schematic structural diagram of a display device according to some embodiments of the present disclosure.

[0196] Optionally, embodiments of the present disclosure further provide a display device. Referring to FIG. 17 , the display device 300 may include the display substrate 100 or display panel 200 described above. The display device may include, but is not limited to, electronic paper, mobile phones, tablet computers, monitors, laptop computers, digital photo frames, navigation systems, and any other product or component with a display function. It should be understood that this display device has the same beneficial effects as the display substrates provided in the aforementioned embodiments.

[0197] Although some embodiments of the present general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the present general inventive concept, the scope of which is defined in the claims and their equivalents.

Claims

1. A display substrate, characterized in that: A plurality of pixel units arranged in an array, each pixel unit including a plurality of sub-pixels, each sub-pixel including: a base substrate; a reflective layer disposed on the base substrate; and a microcavity adjustment layer and a light-emitting structure layer disposed on a side of the reflective layer away from the base substrate, wherein the light-emitting structure layer includes a first electrode, a light-emitting layer, and a second electrode sequentially disposed on the microcavity adjustment layer, and the distance between the second electrode and the reflective layer in at least two sub-pixels is different; The sub-pixel further includes a pixel definition layer, a driving circuit layer, and a transition portion, wherein the pixel definition layer is used to define a light-emitting area of ​​the sub-pixel; the driving circuit layer and the first electrode of the light-emitting structure layer are connected via the transition portion; and the orthographic projection of the transition portion on the base substrate falls within the orthographic projection of the pixel definition layer on the base substrate; The plurality of sub-pixels include a first sub-pixel, a second sub-pixel, and a third sub-pixel, wherein the third sub-pixel includes a third transition portion, and an orthographic projection of the third transition portion on the base substrate is located in a gap between orthographic projections of the first sub-pixel and the second sub-pixel on the base substrate; The third transfer portion includes a first electrode transfer layer and a second electrode transfer layer, wherein the second electrode transfer layer is located in a first via hole, and the first via hole passes through the pixel definition layer; the first electrode transfer layer is located on a side of the second electrode transfer layer away from the base substrate; the first electrode transfer layer includes a first portion, a second portion, and a third portion, wherein the second portion is electrically connected to the second electrode transfer layer, the first portion is located on a first side of the second portion facing the first sub-pixel, and the first portion has a first slope angle; the third portion is located on a second side of the second portion facing the second sub-pixel, and the second portion has a second slope angle. Wherein, the second slope angle is greater than the first slope angle.

2. The display substrate according to claim 1, wherein An orthographic projection of the first portion on the base substrate does not overlap with an orthographic projection of the first via hole on the base substrate; And / or, an orthographic projection of the third portion on the base substrate does not overlap with an orthographic projection of the first via hole on the base substrate.

3. The display substrate according to claim 1 or 2, wherein: An absolute value of a difference between the first slope angle and the second slope angle is greater than or equal to 2° and less than or equal to 20°.

4. The display substrate according to any one of claims 1 to 3, wherein: At least a portion of the driving circuit layer is located in the same layer as the reflective layer, and the orthographic projection of the third transition portion on the base substrate falls within the orthographic projection of the driving circuit layer on the base substrate; The orthographic projection of the driving circuit layer on the base substrate protrudes by a first protrusion distance in a direction close to the first sub-pixel relative to the orthographic projection of the third adapter on the base substrate; The orthographic projection of the driving circuit layer on the base substrate protrudes toward the second sub-pixel by a second protrusion distance relative to the orthographic projection of the third adapter on the base substrate, wherein the first protrusion distance is greater than the second protrusion distance.

5. The display substrate according to claim 4, wherein: The first protrusion distance is greater than or equal to 0.1 micrometer and less than or equal to 0.3 micrometer; and / or, The second protrusion distance is greater than or equal to 0.1 micrometers and less than or equal to 0.3 micrometers.

6. The display substrate according to claim 4 or 5, wherein: The ratio of the absolute value of the difference between the second slope angle and the first slope angle to the second slope angle is a slope angle difference ratio; The ratio of the absolute value of the difference between the first protrusion distance and the second protrusion distance to the second protrusion distance is a protrusion distance difference ratio, wherein the absolute value of the difference between the slope angle difference ratio and the protrusion distance difference ratio is greater than or equal to 1% and less than or equal to 10%.

7. The display substrate according to any one of claims 1 to 6, wherein: The first sub-pixel includes a first reflective layer, and the second sub-pixel includes a second reflective layer; The orthographic projection of the first reflective layer on the substrate at least partially overlaps with the orthographic projection of the pixel definition layer on the substrate, and the overlapping portion of the projections of the first reflective layer and the pixel definition layer has a first width; The orthographic projection of the second reflective layer on the base substrate at least partially overlaps with the orthographic projection of the pixel definition layer on the base substrate, and the overlapping portion of the projections of the second reflective layer and the pixel definition layer has a second width. Wherein, the second width is greater than the first width.

8. The display substrate according to claim 7, wherein: The first width is greater than or equal to 0.1 micrometer and less than or equal to 0.3 micrometer; and / or, The second width is greater than or equal to 0.1 micrometer and less than or equal to 0.3 micrometer.

9. The display substrate according to any one of claims 1 to 8, wherein: The first electrode includes a main portion and an edge portion, wherein an orthographic projection of the edge portion on the base substrate at least partially overlaps with an orthographic projection of the pixel definition layer on the base substrate; as well as The main body portion has a first thickness, and the edge portion has a second thickness, wherein the first thickness is smaller than the second thickness.

10. The display substrate according to any one of claims 1 to 9, wherein: The first electrode of the first sub-pixel includes a first edge portion, the first edge portion has a third thickness; the first electrode of the second sub-pixel includes a second edge portion, the second edge portion has a fourth thickness, Wherein, the third thickness is smaller than the fourth thickness.

11. The display substrate according to any one of claims 4 to 6, wherein: The driving circuit layer includes a first side close to the first sub-pixel and a second side close to the second sub-pixel; The first via hole includes a third side close to the first sub-pixel and a fourth side close to the second sub-pixel, wherein the first side and the third side are spaced apart by a third distance; the second side and the fourth side are spaced apart by a fourth distance, The third spacing distance is greater than the fourth spacing distance.

12. The display substrate according to claim 11, wherein: The third spacing distance is greater than or equal to 0.2 micrometers and less than or equal to 0.8 micrometers; and / or, The fourth spacing distance is greater than or equal to 0.2 micrometers and less than or equal to 0.8 micrometers.

13. The display substrate according to claim 10, wherein: The first portion is spaced apart from the first edge portion by a fifth spacing distance; the third portion is spaced apart from the second edge portion by a sixth spacing distance, wherein the fifth spacing distance is equal to the sixth spacing distance.

14. The display substrate according to claim 13, wherein: The fifth spacing distance is greater than or equal to 0.5 micrometers and less than or equal to 1 micrometer; and / or, The sixth spacing distance is greater than or equal to 0.5 micrometers and less than or equal to 1 micrometer.

15. The display substrate according to any one of claims 1 to 14, wherein: The first via hole is spaced apart from the first sub-pixel by a seventh spacing distance; the first via hole is spaced apart from the second sub-pixel by an eighth spacing distance, and the seventh spacing distance is greater than the eighth spacing distance.

16. The display substrate according to any one of claims 1 to 15, wherein: The second portion is substantially parallel to the base substrate.

17. The display substrate according to any one of claims 1 to 16, wherein: The pixel definition layer further includes a second via hole, wherein an orthographic projection of the first via hole on the base substrate falls within an orthographic projection of the second via hole on the base substrate; as well as The first electrode of the third sub-pixel includes a first sub-electrode located in the first via hole and a second sub-electrode located in the second via hole, and the first sub-electrode and the second sub-electrode form a groove electrode.

18. The display substrate according to any one of claims 1 to 17, wherein: The second electrode of the first sub-pixel is close to the first surface of the base substrate and the first reflective layer is away from the second surface of the base substrate and is separated by a first spacing distance; The second electrode of the second sub-pixel is close to the third surface of the base substrate and is spaced apart from the second reflective layer by a second spacing distance from the fourth surface of the base substrate. The first spacing distance is smaller than the second spacing distance.

19. The display substrate according to any one of claims 1 to 18, wherein: The first sub-pixel includes a first microcavity adjustment layer, the second sub-pixel includes a second microcavity adjustment layer, and a thickness of the first microcavity adjustment layer is smaller than a thickness of the second microcavity adjustment layer.

20. The display substrate according to any one of claims 1 to 19, wherein: The pixel definition layer has a step-shaped structure near the edge of the light-emitting area.

21. The display substrate according to claim 20, wherein: The pixel definition layer includes a first sidewall close to the first sub-pixel and a second sidewall close to the second sub-pixel, wherein: The number of steps of the first side wall is greater than the number of steps of the second side wall.

22. The display substrate according to any one of claims 1 to 21, wherein: The second portion of the first electrode transfer layer in the third sub-pixel is away from the surface of the base substrate and is separated from the surface of the base substrate close to the light emitting structure layer by a tenth spacing distance; The first electrode in the first sub-pixel is away from the surface of the substrate and is spaced apart from the surface of the substrate close to the light-emitting structure layer by an eleventh spacing distance, and the tenth spacing distance is greater than the eleventh spacing distance; and / or, the first electrode in the second sub-pixel is away from the surface of the substrate and is spaced apart from the surface of the substrate close to the light-emitting structure layer by a twelfth spacing distance, and the tenth spacing distance is greater than the twelfth spacing distance.

23. The display substrate according to any one of claims 1 to 16, wherein: The first electrode includes a first conductive portion and a second conductive portion, wherein the first conductive portion is located in the third via hole, and the orthographic projection of the second conductive portion on the base substrate does not overlap with the orthographic projection of the third via hole on the base substrate, wherein the first conductive portion includes a protruding structure, and the thickness of the protruding structure of the first conductive portion is less than the thickness of the second conductive portion.

24. The display substrate according to any one of claims 1 to 23, wherein: The second electrode transition layer is located in the first via; the first electrode includes a first conductive portion, which is located in the third via, wherein the first conductive portion is electrically connected to the second portion in the first electrode transition layer, wherein the orthographic projection of the first via on the base substrate does not overlap with the orthographic projection of the third via on the base substrate.

25. A display substrate, characterized in that: A plurality of pixel units arranged in an array, each pixel unit including a plurality of sub-pixels, each sub-pixel including: a base substrate; a reflective layer disposed on the base substrate; and a microcavity adjustment layer and a light-emitting structure layer disposed on a side of the reflective layer away from the base substrate, wherein the light-emitting structure layer includes a first electrode, a light-emitting layer, and a second electrode sequentially disposed on the microcavity adjustment layer, and the distance between the second electrode and the reflective layer in the plurality of sub-pixels is different; The sub-pixel further includes a pixel definition layer, a driving circuit layer, and a transition portion, wherein the pixel definition layer is used to define a light-emitting area of ​​the sub-pixel; the driving circuit layer and the first electrode of the light-emitting structure layer are connected via the transition portion; and the orthographic projection of the transition portion on the base substrate falls within the orthographic projection of the pixel definition layer on the base substrate; The plurality of sub-pixels include a first sub-pixel, a second sub-pixel, and a third sub-pixel, wherein the third sub-pixel includes a third transition portion, and an orthographic projection of the third transition portion on the base substrate is located in a gap between orthographic projections of the first sub-pixel and the second sub-pixel on the base substrate; The third transfer portion includes a first electrode transfer layer and a second electrode transfer layer, wherein the second electrode transfer layer is located in a first via hole, and the first via hole passes through the pixel definition layer; the first electrode transfer layer is located on a side of the second electrode transfer layer away from the base substrate; the surface of the first electrode transfer layer close to the second electrode transfer layer is a convex arc surface, wherein the first electrode transfer layer includes a fifth side facing the first sub-pixel, and the fifth side has a third slope angle; the first electrode transfer layer also includes a sixth side facing the second sub-pixel, and the sixth side has a fourth slope angle, Wherein, the fourth slope angle is greater than the third slope angle.

26. The display substrate according to claim 25, wherein: The pixel definition layer includes a third sidewall located around the first via hole, wherein at least a portion of the third sidewall is stepped.

27. A display panel, characterized in that: The display panel includes the display substrate according to any one of claims 1 to 26.

28. A display device, characterized in that: The display device comprises the display substrate according to any one of claims 1 to 26 or the display panel according to claim 27.

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