Display substrate and display device

Abstract

The invention discloses a display substrate and a display device. The display substrate comprises sub-pixels; the display substrate comprises sub-pixels; each sub-pixel comprises a light-emitting device, and each light-emitting device comprises a first electrode, a light-emitting functional layer and a second electrode which are sequentially stacked in the direction away from the substrate; the display substrate further comprises a dielectric layer, the surface of the side, away from the substrate, of the dielectric layer comprises a convex surface area, the convex surface area is located on the side, close to the substrate, of the light-emitting functional layer, the orthographic projection of the convex surface area on the substrate covers the sub-pixels, the convex surface area at least comprises a first cambered surface, and the first cambered surface at least comprises a second cambered surface. The first cambered surface protrudes towards the direction far away from the substrate, and the orthographic projection of the edge area, far away from one side of the central axis of the sub-pixel, of the first cambered surface on the substrate comprises the orthographic projection of the light-emitting functional layer of the edge area of the sub-pixel on the substrate.

Description

Technical Field

[0001] This article relates to but is not limited to the field of display technology, and specifically to a display substrate and a display device. Background Art

[0002] Micro Organic Light-Emitting Diode (Micro-OLED) is a micro display that has been developed in recent years, and silicon-based OLED is one of them. Silicon-based OLED can not only realize active addressing of pixels, but also realize the preparation of pixel circuits and other structures on silicon-based substrates, which is conducive to reducing the system volume and achieving lightweight. Silicon-based OLED is prepared using mature complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) integrated circuit technology. It has the advantages of small size, high resolution (Pixels Per Inch, PPI), high refresh rate, etc., and is widely used in virtual reality (VR) or augmented reality (AR) near-eye display fields. Summary of the invention

[0003] An embodiment of the present application provides a display substrate that can reduce the “edge effect” of the display substrate.

[0004] The display substrate of the embodiment of the present application includes a sub-pixel; the sub-pixel includes a light-emitting device, and the light-emitting device includes a first electrode, a light-emitting functional layer, and a second electrode stacked in sequence in a direction away from the substrate; The display substrate also includes a dielectric layer, and a surface of the dielectric layer away from the substrate includes a convex area, the convex area is located on the side of the light-emitting functional layer close to the substrate, and the orthographic projection of the convex area on the substrate covers the sub-pixel. The convex area includes at least a first curved surface, and the first curved surface protrudes in a direction away from the substrate. The orthographic projection of an edge area of ​​the first curved surface away from the central axis of the sub-pixel on the substrate includes the orthographic projection of the light-emitting functional layer of the edge area of ​​the sub-pixel on the substrate.

[0005] In an exemplary embodiment, the convex region is in contact with the first electrode.

[0006] In an exemplary embodiment, the thickness of the light emitting function layer in the edge region of the sub-pixel gradually decreases along a direction away from the central axis of the sub-pixel.

[0007] In an exemplary embodiment, the angle between the tangent plane of the first arc edge and the plane where the base is located is greater than or equal to 5 degrees and less than or equal to 15 degrees.

[0008] In an exemplary embodiment, the convex area includes a first curved surface, the orthographic projection of the first curved surface on the substrate covers the sub-pixel, the orthographic projection of the light-emitting functional layer in the middle area of ​​the sub-pixel on the substrate overlaps with the orthographic projection of the middle area of ​​the first curved surface on the substrate, and the orthographic projection of the light-emitting functional layer in the edge area of ​​the sub-pixel on the substrate is located in the orthographic projection of the edge area of ​​the first curved surface on the substrate.

[0009] In an exemplary embodiment, the convex area also includes a second curved surface, which protrudes away from the substrate, and the second curved surface is located on the side of the first curved surface close to the central axis of the sub-pixel, and the orthographic projection of the second curved surface on the substrate does not overlap with the orthographic projection of the light-emitting functional layer of the edge area of ​​the sub-pixel on the substrate.

[0010] In an exemplary embodiment, the maximum size of the outer contour of the second curved surface projected on the base is approximately equal to the maximum size of the outer contour of the first curved surface projected on the base; or, the maximum size of the outer contour of the second curved surface projected on the base is greater than the maximum size of the outer contour of the first curved surface projected on the base.

[0011] In an exemplary embodiment, the angle between the tangent plane of the second arc surface edge and the plane where the base is located is approximately equal to the angle between the tangent plane of the first arc surface edge and the plane where the base is located; or, the angle between the tangent plane of the second arc surface edge and the plane where the base is located is smaller than the angle between the tangent plane of the first arc surface edge and the plane where the base is located.

[0012] In an exemplary embodiment, the surface of the dielectric layer away from the substrate further includes a flat region, the flat region is parallel to the substrate, and the flat region is connected to an edge of the convex region.

[0013] In an exemplary embodiment, the convex region is in contact with a surface of the first electrode on a side close to the substrate.

[0014] In an exemplary embodiment, the first electrode includes a plurality of conductive patterns stacked together, the dielectric layer is disposed between any adjacent conductive patterns, and the convex region of the dielectric layer contacts the conductive pattern located on a side of the dielectric layer away from the substrate.

[0015] In an exemplary embodiment, a pixel definition layer is further included, in which a pixel opening defining the sub-pixel is provided, the pixel opening exposes at least a portion of the first electrode, the light-emitting functional layer is in contact with the exposed first electrode, the pixel definition layer is provided with an undercut structure, and at least a portion of the film layer of the light-emitting functional layer is cut off at the undercut structure.

[0016] In an exemplary embodiment, the light-emitting functional layer includes a plurality of light-emitting units stacked in sequence along a direction away from the substrate and a charge generating layer located between adjacent light-emitting units, the light-emitting unit includes at least a light-emitting layer, and the light-emitting layers and charge generating layers of the plurality of light-emitting units in the light-emitting functional layer are both separated at the undercut structure.

[0017] In an exemplary embodiment, the second electrodes of a plurality of the sub-pixels are connected as one body.

[0018] An embodiment of the present application also provides a display device, comprising the aforementioned display substrate.

[0019] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by implementing the present application. Other advantages of the present application can be realized and obtained by the schemes described in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide an understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0021] Figure 1 is a schematic diagram of the cross-sectional structure of a sub-pixel edge region of a related display substrate; Figure 2 is a structural schematic diagram of a display device; Figure 3 A schematic diagram of the planar structure of a display area in a display device; Figure 4 A schematic cross-sectional structure diagram of a display substrate according to an embodiment of the present disclosure; Figure 5 It is a schematic cross-sectional structure diagram of a dielectric layer of a display substrate according to an embodiment of the present disclosure; Figure 6 It is a schematic cross-sectional structure diagram of a dielectric layer of another display substrate according to an embodiment of the present disclosure; Figure 7 It is a schematic cross-sectional structure diagram of a dielectric layer of another display substrate according to an embodiment of the present disclosure; Figure 8It is a schematic diagram of the cross-sectional structure of a dielectric layer of another display substrate according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0022] The present application describes multiple embodiments, but the description is exemplary rather than restrictive, and it is obvious to those skilled in the art that there may be more embodiments and implementations within the scope of the embodiments described in the present application. Although many possible feature combinations are shown in the drawings and discussed in the specific embodiments, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with any other feature or element in any other embodiment, or may replace any other feature or element in any other embodiment.

[0023] The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in the present application may also be combined with any conventional features or elements to form a unique invention scheme. Any features or elements of any embodiment may also be combined with features or elements from other invention schemes to form another unique invention scheme. Therefore, it should be understood that any feature shown and / or discussed in the present application may be implemented individually or in any appropriate combination. Therefore, except for the limitations made according to the attached claims and their equivalents, the embodiments are not subject to other restrictions. In addition, various modifications and changes may be made within the scope of protection of the attached claims.

[0024] In addition, when describing representative embodiments, the specification may have presented the method and / or process as a specific sequence of steps. However, to the extent that the method or process does not rely on the specific order of the steps described herein, the method or process should not be limited to the steps of the specific order described. As will be understood by those of ordinary skill in the art, other sequences of steps are also possible. Therefore, the specific sequence of the steps set forth in the specification should not be interpreted as a limitation to the claims. In addition, the claims for the method and / or process should not be limited to the steps of performing them in the order written, and those skilled in the art can easily understand that these sequences can be changed and still remain within the spirit and scope of the embodiments of the present application.

[0025] Figure 1 FIG. 1 is a schematic diagram of a cross-sectional structure of a sub-pixel edge region of a related display substrate. Figure 1As shown, in the direction perpendicular to the display substrate, the relevant display substrate may include: a substrate 101', a driving circuit layer 102' arranged on the substrate 101', an insulating adjustment layer 14' arranged on the side of the driving circuit layer 102' away from the substrate 101', and a light-emitting structure layer arranged on the side of the insulating adjustment layer 14' away from the substrate 101'. The light-emitting structure layer includes a first electrode 11', a light-emitting functional layer 12' and a second electrode 13' stacked in sequence in a direction away from the substrate 101', and the light-emitting functional layer 12' includes a first light-emitting unit 12-1' and a second light-emitting unit 12-2' stacked in sequence in a direction away from the substrate 101', and a charge generation layer 30' arranged between the first light-emitting unit 12-1' and the second light-emitting unit 12-2'. The first light-emitting unit 12-1' includes a first auxiliary layer 41', a first light-emitting layer 31' and a second auxiliary layer 42' which are stacked in sequence along a direction away from the substrate 101', and the first auxiliary layer 41' includes at least one of a first hole injection layer (HIL), a first hole transport layer (HTL) and a first functional layer (prime); the first light-emitting layer 31' is configured to emit yellow light, and the first light-emitting layer 31' can be a yellow light-emitting layer or a red light-emitting layer and a green light-emitting layer stacked on each other; the second auxiliary layer 42' includes at least one of a first hole blocking layer and a first electron transport layer. The second light-emitting unit 12-2' includes a third auxiliary layer 43', a second light-emitting layer 32' and a fourth auxiliary layer 44' which are sequentially stacked in a direction away from the substrate 101'. The third auxiliary layer 43' includes at least one of a second hole transport layer (HTL) and a second functional layer. The second light-emitting layer 32' is configured to emit blue light, and the second light-emitting layer 32' is a blue light-emitting layer 32'; the fourth auxiliary layer 44' includes at least one of a second hole blocking layer (HBL), a second electron transport layer (ETL) and an electron injection layer (EIL). The yellow light emitted by the first light-emitting layer 31' and the blue light emitted by the second light-emitting layer 32' are superimposed on each other to form white light.

[0026] The relevant display substrate further includes a pixel definition layer 21', at least part of which is disposed on the side of the first electrode 11' away from the substrate 101', and the pixel definition layer 21' is provided with a pixel opening defining a sub-pixel, and the pixel opening exposes at least part of the first electrode 11'. The sidewall of the pixel definition layer 21' is provided with an undercut structure 22', and the undercut structure 22' is configured to disconnect the charge generation layer 30' of the light-emitting functional layer 12' to prevent adjacent sub-pixels from crosstalking with each other.

[0027] The inventors of the present application have found through research that the light-emitting functional layer 12' covers the bottom cut structure 22' of the pixel definition layer 21', the first light-emitting layer 31' and the charge generation layer 30' of the light-emitting functional layer 12' form a recessed area 23' at the bottom cut structure 22' of the pixel definition layer 21', and the second light-emitting layer 32' of the light-emitting functional layer 12' is not disconnected at the bottom cut structure 22' and covers the bottom cut structure 22'. The recessed area 23' is recessed along the direction close to the substrate 101', and the recessed area 23' makes the morphology of the first light-emitting layer 31' and the charge generation layer 30' of the light-emitting functional layer 12' irregular, causing abnormal carrier transmission, resulting in leakage, as well as carrier accumulation, causing life attenuation and other undesirable "edge effects".

[0028] The display substrate of the embodiment of the present application includes a sub-pixel; the sub-pixel includes a light-emitting device, and the light-emitting device includes a first electrode, a light-emitting functional layer, and a second electrode sequentially stacked in a direction away from the substrate; The display substrate also includes a dielectric layer, and a surface of the dielectric layer away from the substrate includes a convex area, the convex area is located on the side of the light-emitting functional layer close to the substrate, and the orthographic projection of the convex area on the substrate covers the sub-pixel. The convex area includes at least a first curved surface, and the first curved surface protrudes in a direction away from the substrate. The orthographic projection of an edge area of ​​the first curved surface away from the central axis of the sub-pixel on the substrate includes the orthographic projection of the light-emitting functional layer of the edge area of ​​the sub-pixel on the substrate.

[0029] In an exemplary embodiment, the convex region is in contact with the first electrode.

[0030] In an exemplary embodiment, the thickness of the light emitting function layer in the edge region of the sub-pixel gradually decreases along a direction away from the central axis of the sub-pixel.

[0031] In an exemplary embodiment, the angle between the tangent plane of the first arc edge and the plane where the base is located is greater than or equal to 5 degrees and less than or equal to 15 degrees.

[0032] Figure 2 FIG. 1 is a schematic diagram of the structure of a display device. Figure 2As shown, the display device may include: a timing controller, a data driver, a scan driver, a light-emitting driver and a pixel array. The timing controller is connected to the data driver, the scan driver and the light-emitting driver respectively. The data driver is connected to a plurality of data signal lines (for example, D1 to Dn), the scan driver is connected to a plurality of scan signal lines (for example, S1 to Sm), and the light-emitting driver is connected to a plurality of light-emitting control lines (for example, E1 to Eo). Among them, n, m and o can be natural numbers. The pixel array may include at least two sub-pixels Pxij, and i and j can be natural numbers. At least one sub-pixel Pxij may include: a pixel circuit and a light-emitting device connected to the pixel circuit. The pixel circuit may be connected to the scan signal line, the light-emitting control line and the data signal line, respectively.

[0033] In some exemplary embodiments, the timing controller may provide a grayscale value and a control signal suitable for the specifications of the data driver to the data driver, a clock signal, a scan start signal, etc. suitable for the specifications of the scan driver to the scan driver, and a clock signal, an emission stop signal, etc. suitable for the specifications of the light emitting driver to the light emitting driver. The data driver may generate a data voltage to be provided to the data signal lines D1, D2, D3, ... and Dn using the grayscale value and the control signal received from the timing controller. For example, the data driver may sample the grayscale value using the clock signal, and apply the data voltage corresponding to the grayscale value to the data signal lines D1 to Dn in units of pixel rows. The scan driver may generate a scan signal to be provided to the scan signal lines S1, S2, S3, ... and Sm by receiving a clock signal, a scan start signal, etc. from the timing controller. For example, the scan driver may sequentially provide a scan signal having an on-level pulse to the scan signal lines S1 to Sm. For example, the scan driver may be constructed in the form of a shift register, and may generate a scan signal in a manner that a scan start signal provided in the form of an on-level pulse is sequentially transmitted to a next-level circuit under the control of a clock signal. The light-emitting driver may generate a light-emitting control signal to be provided to the light-emitting control lines E1, E2, E3, ... and Eo by receiving a clock signal, an emission stop signal, etc. from a timing controller. For example, the light-emitting driver may sequentially provide an emission signal with an off-level pulse to the light-emitting control lines E1 to Eo. For example, the light-emitting driver may be constructed in the form of a shift register, and may generate a light-emitting control signal in a manner that an emission stop signal provided in the form of an off-level pulse is sequentially transmitted to a next-level circuit under the control of a clock signal.

[0034] Figure 3 FIG. 1 is a schematic diagram of a planar structure of a display area in a display device. Figure 3As shown, the display area of ​​the display device may include a plurality of pixel units P arranged in a matrix manner, at least one of the plurality of pixel units P includes a first sub-pixel P1 emitting a first color light, a second sub-pixel P2 emitting a second color light, and a third sub-pixel P3 emitting a third color light, and the first sub-pixel P1, the second sub-pixel P2, and the third sub-pixel P3 all include a pixel circuit and a light-emitting device. The pixel circuits in the sub-pixels are respectively connected to the scan signal lines and the data signal lines, and the pixel circuits are configured to receive the data voltage transmitted by the data signal lines under the control of the scan signal lines, and output corresponding currents to the light-emitting devices. The light-emitting devices in the sub-pixels are respectively connected to the pixel circuits of the sub-pixels in which they are located, and the light-emitting devices are configured to emit light of corresponding brightness in response to the current output by the pixel circuits of the sub-pixels in which they are located.

[0035] In an exemplary embodiment, the first sub-pixel P1 may be a red sub-pixel emitting red (R) light, the second sub-pixel P2 may be a green sub-pixel emitting green (G) light, and the third sub-pixel P3 may be a blue sub-pixel emitting blue (B) light. In an exemplary embodiment, the shape of the sub-pixels may be any one or more of a triangle, a square, a rectangle, a rhombus, a trapezoid, a parallelogram, a pentagon, a hexagon, and other polygons, and may be arranged in a horizontal parallel arrangement, a vertical parallel arrangement, an X shape, a cross shape, a herringbone shape, a square shape, a diamond shape, or a delta shape, which is not limited in the present disclosure.

[0036] In an exemplary embodiment, a pixel unit may include four sub-pixels, which is not limited in the present disclosure.

[0037] Figure 4 Schematic diagram of a cross-sectional structure of a display substrate according to an embodiment of the present disclosure, wherein: Figure 4 Can be Figure 3 A cross-sectional view of a sub-pixel in FIG. Figure 4 As shown, in a direction parallel to the display substrate, the display substrate of the embodiment of the present disclosure may include a sub-pixel 10 and a non-sub-pixel area 20 located between adjacent sub-pixels. In a direction perpendicular to the display substrate, the display substrate of the embodiment of the present disclosure may include a substrate 101, a driving circuit layer 102 disposed on the substrate 101, a dielectric layer 14 disposed on a side of the driving circuit layer 102 away from the substrate 101, and a light emitting structure layer disposed on a side of the dielectric layer 14 away from the substrate 101. In some possible implementations, the display substrate may include other film layers, for example, an encapsulation structure layer, a color film structure layer, a touch film layer, a cover layer, a lens layer, etc.

[0038] In exemplary embodiments, the substrate 101 may be a silicon substrate or a glass substrate.

[0039] In an exemplary embodiment, the driving circuit layer 102 may be fabricated on the substrate 101 by a silicon semiconductor process (eg, a CMOS process), and the driving circuit layer 102 may include a pixel circuit, and the pixel circuit may include a plurality of transistors and a storage capacitor.

[0040] In an exemplary embodiment, the light emitting structure layer may include a light emitting device located in the sub-pixel 10. The light emitting device may be a tandem light emitting device, and the light emitting device may emit white light or light of other colors. In some embodiments, the light emitting device may be a single-layer light emitting device.

[0041] In an exemplary embodiment, the light-emitting device may include a first electrode 11, a light-emitting functional layer 12, and a second electrode 13 stacked in sequence along a direction away from the substrate 101. The first electrode 11 may be connected to the transistor of the driving circuit layer 102, the light-emitting functional layer 12 is connected to the first electrode 11, and the second electrode 13 is connected to the light-emitting functional layer 12. The light-emitting functional layer 12 emits light, such as white light or light of other colors, when driven by the first electrode 11 and the second electrode 13.

[0042] In an exemplary embodiment, the first electrode 11 may be a weak microcavity structure, and the first electrode 11 may be a single film layer structure or a multi-film layer structure. For example, the first electrode 11 may be a three-film layer structure. The first electrode 11 may include a first conductive layer, a second conductive layer, and a third conductive layer stacked in sequence along a direction perpendicular to the substrate, wherein the first conductive layer is disposed on a side of the dielectric layer 14 away from the substrate 101; the second conductive layer is disposed on a side of the first conductive layer away from the substrate, and the third conductive layer is disposed on a side of the second conductive layer away from the substrate 101. The materials of the first conductive layer and the third conductive layer may be titanium nitride, and the material of the second conductive layer may be a conductive metal, such as aluminum, copper, etc.

[0043] In an exemplary embodiment, the light-emitting functional layer 12 includes a first light-emitting unit 12-1, a charge generation layer 30, and a second light-emitting unit 12-2, which are sequentially stacked in a direction away from the substrate 101. The charge generation layer 30 is electrically connected to the first light-emitting unit 12-1 and the second light-emitting unit 12-2, respectively. The charge generation layer 30 generates holes and electrons under the voltage of the first electrode 11 and the second electrode 13. The first light-emitting unit 12-1 may include a first auxiliary layer 41, a first light-emitting layer 31, and a second auxiliary layer 42, which are sequentially stacked in a direction away from the substrate 101. The first auxiliary layer 41 may include any one or more of the following: a first hole injection layer (HIL) and a first hole transport layer (HTL). The second auxiliary layer 42 may include any one or more of the following: a first electron transport layer (ETL), a first electron injection layer (EIL), and a first hole blocking layer (HBL). The second light-emitting unit 12-2 may include a third auxiliary layer 43, a second light-emitting layer 32, and a fourth auxiliary layer 44, which are sequentially stacked in a direction away from the substrate 101. The third auxiliary layer 43 may include any one or more of the following: a second hole injection layer (HIL) and a second hole transport layer (HTL). The fourth auxiliary layer 44 may include any one or more of the following: a second electron transport layer (ETL), a second electron injection layer (EIL), and a second hole blocking layer (HBL).

[0044] In an exemplary embodiment, the first light-emitting layer 31 is configured to emit yellow light. For example, the first light-emitting layer 31 may be a yellow light-emitting layer; or, the first light-emitting layer 31 includes a red light-emitting layer and a green light-emitting layer stacked on each other. The second light-emitting layer 32 is configured to emit blue light. For example, the second light-emitting layer 32 may be a blue light-emitting layer. The yellow light emitted by the first light-emitting layer 31 and the blue light emitted by the second light-emitting layer 32 are superimposed on each other to form white light.

[0045] In some embodiments, the positions of the first light-emitting layer and the second light-emitting layer can be interchanged, the first light-emitting unit includes the second light-emitting layer, and the second light-emitting unit includes the first light-emitting layer. This disclosure will not be repeated here.

[0046] In an exemplary embodiment, the display substrate of the embodiment of the present disclosure also includes a pixel definition layer 21, in which a pixel opening defining the sub-pixel 10 is provided, the pixel opening exposing at least a portion of the first electrode 11, and the light-emitting functional layer 12 covers the pixel opening and contacts the first electrode 11 exposed by the pixel opening.

[0047] In an exemplary embodiment, the pixel definition layer 21 includes a first definition layer 21-1, a second definition layer 21-2, and a third definition layer 21-3 stacked in sequence along a direction away from the substrate. The first definition layer 21-1 has a first side surface close to the pixel opening, the second definition layer 21-2 has a second side surface close to the pixel opening, and the third definition layer 21-3 has a third side surface close to the pixel opening. The first side surface of the first definition layer 21-1 is connected to the surface of the first electrode 11 away from the substrate 101, and the first side surface extends out from the second side surface of the second definition layer 21-2 and the third side surface of the third definition layer 21-3. The second side surface of the second definition layer 21-2 is concave compared to the first side surface of the first definition layer 21-1 and the third side surface of the third definition layer 21-3, respectively, to form an undercut structure 22 concave along a direction parallel to the substrate, and the undercut structure 22 can isolate the light-emitting functional layer 12 above it, so that the light-emitting functional layer 12 in the sub-pixel 10 is disconnected from the light-emitting functional layer material in the non-sub-pixel area 20, and prevents adjacent sub-pixels 10 from crosstalking with each other.

[0048] Figure 5 Schematic diagram of the cross-sectional structure of a dielectric layer of a display substrate according to an embodiment of the present disclosure, wherein: Figure 5 The dielectric layer in Figure 4 In an exemplary embodiment, as Figure 4 and Figure 5 As shown, the surface of the dielectric layer 14 away from the substrate 101 includes a convex area 14-1 and a flat area 14-2, and the positive projection of the convex area 14-1 on the substrate 101 covers the sub-pixel 10. The flat area 14-2 is parallel to the substrate 101, the flat area 14-2 is located in the non-sub-pixel area 20, the flat area 14-2 is connected to the edge of the convex area 14-1, and the flat area 14-2 can be arranged around the convex area 14-1.

[0049] In an exemplary embodiment, the convex area 14-1 includes a first curved surface 51, the first curved surface 51 is convex in a direction away from the substrate 101, and a vertical distance h1 from any position of the first curved surface 51 to the substrate 101 is greater than or equal to a vertical distance h2 from the flat area 14-2 to the substrate 101. The orthographic projection of the first curved surface 51 on the substrate 101 includes the corresponding sub-pixel 10, and the vertical distance h1 from the first curved surface 51 to the surface of the substrate 101 gradually decreases along the middle area of ​​the sub-pixel 10 toward the edge area of ​​the sub-pixel 10, so that the vertical distance h1 from the first curved surface 51 corresponding to the middle area of ​​the sub-pixel 10 to the surface of the substrate 101 is greater than the vertical distance h1 from the first curved surface 51 corresponding to the edge area of ​​the sub-pixel 10 to the surface of the substrate 101.

[0050] In an exemplary embodiment, the shape of the orthographic projection of the first curved surface 51 on the substrate may include any one or more of a circle, an ellipse, a triangle, a square, a rectangle, a rhombus, a trapezoid, a parallelogram, a pentagon, a hexagon, and other polygons. The shape of the orthographic projection of the first curved surface 51 on the substrate may be the same as or different from the shape of the sub-pixel 10.

[0051] In an exemplary embodiment, the surface of the first electrode 11 close to the substrate 101 contacts the convex area 14-1, the first electrode 11 is formed along the first curved surface 51, the surface of the first electrode 11 away from the substrate 101 is a curved surface, and the contour of the surface of the first electrode 11 away from the substrate 101 is substantially the same as the contour of the corresponding first curved surface 51.

[0052] In an exemplary embodiment, the surface of the light-emitting functional layer 12 close to the substrate contacts the surface of the first electrode 11 away from the substrate 101. The orthographic projection of the light-emitting functional layer 12 in the middle area of ​​the sub-pixel 10 on the substrate overlaps with the orthographic projection of the middle area of ​​the first curved surface 51 on the substrate, and the orthographic projection of the light-emitting functional layer 12 in the edge area of ​​the sub-pixel 10 on the substrate overlaps with the orthographic projection of the edge area of ​​the first curved surface 51 on the substrate. The thickness H of the light-emitting functional layer 12 gradually decreases along the direction from the middle area of ​​the sub-pixel 10 to the edge area of ​​the sub-pixel 10.

[0053] The disclosed embodiment shows that the substrate has a first curved surface 51 through the dielectric layer 14, so that the thickness H of the light-emitting functional layer 12 gradually decreases in the direction away from the central axis of the sub-pixel, ensuring that the light-emitting functional layer 12 in the edge area of ​​the sub-pixel 10 is completely broken at the bottom cut structure 22 of the pixel definition layer 21, preventing adjacent sub-pixels 10 from crosstalking with each other, avoiding the formation of a recessed area in the light-emitting functional layer 12 in the edge area of ​​the sub-pixel 10, and reducing the "edge effect".

[0054] In an exemplary embodiment, the edge of the first arc surface 51 is the lowest end of the arc surface, and an angle θ is formed between a tangent plane of the edge of the first arc surface 51 and a plane where the substrate 101 is located, and the angle θ may be greater than or equal to 5 degrees and less than or equal to 15 degrees. For example, the angle θ may be greater than or equal to 8 degrees and less than or equal to 12 degrees.

[0055] The disclosed embodiment shows that the substrate controls the angle θ between the cut surface of the edge of the first arc surface 51 and the plane where the base 101 is located to be greater than or equal to 5 degrees and less than or equal to 15 degrees, thereby ensuring that the light-emitting functional layer 12 in the edge area of ​​the sub-pixel 10 is completely broken at the bottom cut structure 22 of the pixel definition layer 21, avoiding the formation of a recessed area in the light-emitting functional layer 12 in the edge area of ​​the sub-pixel 10 and reducing the "edge effect".

[0056] In an exemplary embodiment, the first light-emitting layer 31, the second light-emitting layer 32, the charge generation layer 30, the hole injection layer, the hole transport layer and other film layers in the light-emitting functional layer 12 are all broken at the bottom cut structure 22 of the pixel definition layer 21, so that the first light-emitting layer 31, the second light-emitting layer 32, the charge generation layer 30, the hole injection layer, the hole transport layer and other film layers in the sub-pixel 10 are completely disconnected from the first light-emitting layer material, the second light-emitting layer material, the charge generation layer material, the hole injection layer material, the hole transport layer material and other film layers in the non-sub-pixel area 20, respectively, thereby avoiding crosstalk between adjacent sub-pixels 10.

[0057] In an exemplary embodiment, the light emitting functional layer 12 extends along a surface of the first electrode 11 away from the substrate, and a surface of the light emitting functional layer 12 away from the substrate is a curved surface.

[0058] The disclosed embodiment of the display substrate makes the surface of the light-emitting functional layer 12 away from the substrate a curved surface through the first curved surface 51 of the convex area 14-1, thereby improving the light extraction efficiency of the light in the light-emitting functional layer 12 with a large viewing angle and increasing the visible viewing angle of the display substrate.

[0059] In an exemplary embodiment, the second electrode 13 contacts the surface of the light-emitting functional layer 12 away from the substrate, the second electrode 13 is not broken at the undercut structure 22 of the pixel definition layer 21, and the second electrode 13 in the sub-pixel 10 is connected as one with the second electrode material in the non-sub-pixel area 20, so that the second electrodes 13 in multiple sub-pixels 10 are connected as one.

[0060] In an exemplary embodiment, the second electrode 13 may transmit visible light, and for example, the transmittance of the second electrode 13 to visible light is greater than or equal to 80%. Alternatively, the second electrode 13 may transmit a certain amount of visible light and reflect a certain amount of visible light, and for example, the transmittance of the second electrode 13 to visible light is 50%, and the reflectance of the second electrode 13 to visible light is 50%.

[0061] In an exemplary embodiment, the material of the second electrode 13 may include a metal or an alloy, for example, the material of the second electrode 13 may be a magnesium-silver alloy, and the mass ratio of magnesium to silver is 1:9. The thickness of the second electrode 13 is greater than or equal to 100 angstroms and less than or equal to 200 angstroms.

[0062] The present disclosure also provides a method for preparing a display substrate, comprising: Step 101 , first forming a driving circuit layer 102 on a substrate 101 , wherein the driving circuit layer 102 includes a pixel circuit, and the pixel circuit includes a plurality of transistors and a storage capacitor.

[0063] Step 102, forming a dielectric layer 14 on the driving circuit layer 102, wherein the surface of the dielectric layer 14 away from the substrate 101 includes a convex area 14-1, and the convex area 14-1 includes a first curved surface 51, and the first curved surface 51 protrudes in a direction away from the substrate 101; an angle θ is formed between a tangent plane of any edge of the first curved surface 51 and a plane where the substrate 101 is located, and the angle θ can be greater than or equal to 5 degrees and less than or equal to 15 degrees.

[0064] Step 103 , forming a first electrode 11 on the first curved surface 51 . The first electrode 11 is formed along the first curved surface 51 , and the profile of the surface of the first electrode 11 away from the substrate 101 is substantially the same as the profile of the corresponding first curved surface 51 .

[0065] In step 104 , a pixel definition layer 21 is formed on the side of the first electrode 11 away from the substrate. A pixel opening defining the sub-pixel 10 is provided in the pixel definition layer 21 . The pixel opening exposes the first electrode 11 . An undercut structure 22 is provided on the side of the pixel definition layer 21 close to the pixel opening.

[0066] Step 105, through the evaporation process, a light-emitting functional layer 12 is formed on the side of the pixel definition layer 21 away from the substrate, the light-emitting functional layer 12 covers the pixel opening and contacts the exposed first electrode 11, the thickness H1 of the light-emitting functional layer 12 in the middle area of ​​the sub-pixel 10 is greater than the thickness H2 of the light-emitting functional layer 12 in the edge area of ​​the sub-pixel 10, and the first light-emitting layer 31, the second light-emitting layer 32, the charge generation layer 30, the hole injection layer, the hole transport layer and other film layers of the light-emitting functional layer 12 in the edge area of ​​the sub-pixel 10 are all broken at the bottom cut structure 22 of the pixel definition layer 21.

[0067] Step 106 , forming a second electrode 13 on the side of the light-emitting functional layer 12 away from the substrate, and the second electrode 13 of the sub-pixel 10 is connected to the second electrode material of the non-sub-pixel region 20 as a whole.

[0068] Figure 6 FIG. 1 is a schematic cross-sectional structure diagram of a dielectric layer of another display substrate according to an embodiment of the present disclosure. Figure 6 Can be Figure 3 A cross-sectional view of a dielectric layer of a sub-pixel in FIG. Figure 6 As shown, the embodiment of the present disclosure shows that the dielectric layer of the substrate and Figure 5The structure of the dielectric layer of the display substrate is substantially the same, except that the convex area 14-1 of the dielectric layer 14 of the display substrate of the embodiment of the present disclosure includes a plurality of first curved surfaces 51 and a plurality of second curved surfaces 52, and the first curved surface 51 is located at the edge area of ​​the convex area 14-1. The orthographic projection of the edge area of ​​the first curved surface 51 away from the central axis of the sub-pixel 10 on the substrate includes the orthographic projection of the light-emitting functional layer 12 of the edge area of ​​the sub-pixel 10 on the substrate, so that the thickness of the light-emitting functional layer 12 of the edge area of ​​the sub-pixel 10 gradually decreases along the direction away from the central axis of the sub-pixel 10, thereby ensuring that the light-emitting functional layer 12 of the edge area of ​​the sub-pixel 10 is completely broken at the bottom cut structure 22 of the pixel definition layer 21, avoiding the formation of a recessed area of ​​the light-emitting functional layer 12 of the edge area of ​​the sub-pixel 10, and reducing the "edge effect".

[0069] In an exemplary embodiment, the second curved surface 52 protrudes in a direction away from the substrate 101, the second curved surface 52 is located in the middle area of ​​the sub-pixel 10, the second curved surface 52 is connected to the edge of the first curved surface 51 close to the central axis direction of the sub-pixel 10, and the orthographic projection of the second curved surface 52 on the substrate overlaps with the orthographic projection of the light-emitting functional layer 12 in the middle area of ​​the sub-pixel 10 on the substrate.

[0070] In an exemplary embodiment, the shapes of the first curved surface 51 and the second curved surface 52 may be the same or different, the maximum dimension d1 of the outer contour of the orthographic projection of the first curved surface 51 on the substrate is substantially equal to the maximum dimension d2 of the outer contour of the orthographic projection of the second curved surface 52 on the substrate, the angle θ1 between the tangent plane of the edge of the first curved surface 51 and the plane where the substrate 101 is located and the angle θ2 between the tangent plane of the edge of the second curved surface 52 and the plane where the substrate 101 is located are substantially equal, and the angle θ1 and the angle θ2 may both be greater than or equal to 5 degrees and less than or equal to 15 degrees. For example, the angle θ1 and the angle θ2 may both be greater than or equal to 8 degrees and less than or equal to 12 degrees.

[0071] In an exemplary embodiment, in a direction parallel to the substrate, the shape of the first curved surface 51 and the second curved surface 52 may be block-shaped or strip-shaped. The shape of the sub-pixel 10 may include other polygons such as triangles, quadrilaterals, pentagons, etc. The first curved surface 51 is respectively arranged corresponding to the edge regions of each side of the sub-pixel 10, and the positive projection of the light-emitting functional layer 12 in the edge region of each side of the sub-pixel 10 on the substrate is located at the edge region of the corresponding first curved surface 51 away from the central axis of the sub-pixel 10, so that the thickness of the light-emitting functional layer 12 in the edge region of each side of the sub-pixel 10 decreases along the direction away from the central axis of the sub-pixel, thereby ensuring that the light-emitting functional layer 12 in the edge region of each side of the sub-pixel 10 can be completely broken, reducing the "edge effect".

[0072] Figure 7 FIG. 1 is a schematic cross-sectional structure diagram of a dielectric layer of another display substrate according to an embodiment of the present disclosure. Figure 7 Can be Figure 3 A cross-sectional view of the dielectric layer of a sub-pixel in FIG. Figure 7 As shown, the embodiment of the present disclosure shows that the dielectric layer of the substrate and Figure 6 The structure of the dielectric layer of the display substrate is substantially the same, except that the maximum size d1 of the outer contour of the first curved surface 51 projected on the substrate is not equal to the maximum size d2 of the outer contour of the second curved surface 52 projected on the substrate. For example, the maximum size d1 of the outer contour of the first curved surface 51 projected on the substrate is smaller than the maximum size d2 of the outer contour of the second curved surface 52 projected on the substrate. The angle θ1 between the tangent plane of the edge of the first curved surface 51 and the plane where the substrate 101 is located is not equal to the angle θ2 between the tangent plane of the edge of the second curved surface 52 and the plane where the substrate 101 is located. For example, the angle θ1 between the tangent plane of the edge of the first curved surface 51 and the plane where the substrate 101 is located is larger than the angle θ2 between the tangent plane of the edge of the second curved surface 52 and the plane where the substrate 101 is located.

[0073] The disclosed embodiment shows that the substrate adjusts the light output efficiency of the middle area of ​​the sub-pixel 10 and the edge area of ​​the sub-pixel 10 by controlling the maximum size d1 and the angle θ1 of the first curved surface 51 located in the middle area of ​​the sub-pixel 10, and the maximum size d2 and the angle θ2 of the second curved surface 52 located in the edge area of ​​the sub-pixel 10, so that the light emission of the middle area of ​​the sub-pixel 10 is consistent with that of the edge area of ​​the sub-pixel 10, thereby ensuring the uniformity of the light emission of the sub-pixel 10.

[0074] Figure 8 FIG. 1 is a schematic cross-sectional structure diagram of a dielectric layer of another display substrate according to an embodiment of the present disclosure. Figure 8 Can be Figure 3 A cross-sectional view of the dielectric layer of a sub-pixel in FIG. Figure 8 As shown, the embodiment of the present disclosure shows that the dielectric layer of the substrate and Figure 5 The structure of the dielectric layer of the display substrate is substantially the same. The structure of the display substrate in the embodiment of the present disclosure is similar to that of the dielectric layer of the display substrate. Figure 5 The difference between the display substrate structure described above is that the first electrode 11 of the display substrate of the embodiment of the present disclosure is a strong microcavity structure. The first electrode 11 may include a first conductive pattern 11-1, a second conductive pattern 11-2, and a third conductive pattern 11-3 stacked in sequence along a direction perpendicular to the substrate. The dielectric layer 14 may be disposed between the second conductive pattern 11-2 and the third conductive pattern 11-3. As an optical cushion layer of the first electrode 11, the dielectric layer 14 may be used to adjust the thickness of the first electrode 11 so that the first electrode 11 forms a strong microcavity structure. A via is provided in the dielectric layer 14, and the third conductive pattern 11-3 is connected to the second conductive pattern 11-2 through the via.

[0075] The display substrate of the embodiment of the present disclosure has a strong microcavity structure of the sub-pixels, which improves the luminous efficiency of the sub-pixels of the display substrate and increases the color gamut.

[0076] In an exemplary embodiment, the display substrate of the disclosed embodiment may include a first sub-pixel P1 emitting a first color light, a second sub-pixel P2 emitting a second color light, and a third sub-pixel P3 emitting a third color light. For example, the first sub-pixel P1 may be a red sub-pixel, the second sub-pixel P2 may be a green sub-pixel, and the third sub-pixel P3 may be a blue sub-pixel. The thickness of the dielectric layer 14 in the first electrode 11 of the third sub-pixel P3 is greater than the thickness of the dielectric layer 14 in the first electrode 11 of the first sub-pixel P1, and the thickness of the dielectric layer 14 in the first electrode 11 of the first sub-pixel P1 is greater than the thickness of the dielectric layer 14 in the first electrode 11 of the second sub-pixel P2.

[0077] The embodiment of the present disclosure shows that the substrate controls the thickness of the dielectric layer 14 of different sub-pixels so that the corresponding sub-pixels are in a specific light wave resonance period, thereby adjusting the luminous efficiency of different sub-pixels.

[0078] In an exemplary embodiment, the material of the first conductive pattern 11 - 1 and the third conductive pattern 11 - 3 may be a metal compound such as indium tin oxide (ITO), and the material of the second conductive pattern 11 - 2 may be a conductive metal such as silver, aluminum, or the like.

[0079] In an exemplary embodiment, the thickness of the first conductive pattern 11-1 and the third conductive pattern 11-3 is less than the thickness of the second conductive pattern 11-2. For example, the thickness of the first conductive pattern 11-1 and the third conductive pattern 11-3 can be greater than or equal to 70 angstroms and less than or equal to 100 angstroms, and the thickness of the second conductive pattern 11-2 can be greater than or equal to 800 angstroms and less than or equal to 1200 angstroms.

[0080] In some embodiments, the first electrode may include other numbers of conductive patterns in addition to three layers, for example, the first electrode may include two layers, four layers, five layers, six layers, etc. For example, the first electrode may include four layers of conductive patterns, and the first electrode may include a first conductive pattern, a second conductive pattern, a third conductive pattern, and a fourth conductive layer stacked in sequence along a direction perpendicular to the substrate, the material of the first conductive pattern may be titanium, the material of the second conductive pattern may be aluminum, the material of the third conductive pattern may be titanium or titanium nitride, the material of the fourth conductive layer may be indium tin oxide, the thickness of the first conductive pattern may be greater than or equal to 50 angstroms and less than or equal to 100 angstroms, the thickness of the second conductive pattern may be greater than or equal to 800 angstroms and less than or equal to 2000 angstroms, the thickness of the third conductive pattern may be greater than or equal to 50 angstroms and less than or equal to 100 angstroms, the thickness of the fourth conductive layer may be greater than or equal to 50 angstroms and less than or equal to 100 angstroms, and the dielectric layer may be disposed between the second conductive pattern and the third conductive pattern.

[0081] The embodiment of the present disclosure further provides a display device, including any of the above-mentioned display substrates. The display device can be: a mobile phone, a wearable device, an AR or VR display device, a vehicle-mounted display device, a tablet computer, a television, a display, a laptop computer, a digital photo frame, a navigator, or any other product or component with a display function, and the embodiment of the present invention is not limited thereto.

[0082] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0083] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include at least one of the features.

[0084] In the description of the present application, “plurality” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0085] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0086] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0087] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0088] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A display substrate, characterized in that: The sub-pixel comprises a light-emitting device, and the light-emitting device comprises a first electrode, a light-emitting functional layer, and a second electrode sequentially stacked in a direction away from the substrate; The display substrate also includes a dielectric layer, and a surface of the dielectric layer away from the substrate includes a convex area, the convex area is located on the side of the light-emitting functional layer close to the substrate, and the orthographic projection of the convex area on the substrate covers the sub-pixel. The convex area includes at least a first curved surface, and the first curved surface protrudes in a direction away from the substrate. The orthographic projection of an edge area of ​​the first curved surface away from the central axis of the sub-pixel on the substrate includes the orthographic projection of the light-emitting functional layer of the edge area of ​​the sub-pixel on the substrate.

2. The display substrate according to claim 1, characterized in that: The convex region contacts the first electrode.

3. The display substrate according to claim 1, characterized in that: The thickness of the light-emitting functional layer in the edge region of the sub-pixel gradually decreases along a direction away from the central axis of the sub-pixel.

4. The display substrate according to claim 1, characterized in that: The angle between the tangent plane of the edge of the first arc surface and the plane where the base is located is greater than or equal to 5 degrees and less than or equal to 15 degrees.

5. The display substrate according to any one of claims 1 to 4, characterized in that: The convex area includes a first curved surface, the orthographic projection of the first curved surface on the substrate covers the sub-pixel, the orthographic projection of the light-emitting functional layer in the middle area of ​​the sub-pixel on the substrate overlaps with the orthographic projection of the middle area of ​​the first curved surface on the substrate, and the orthographic projection of the light-emitting functional layer in the edge area of ​​the sub-pixel on the substrate is located in the orthographic projection of the edge area of ​​the first curved surface on the substrate.

6. The display substrate according to any one of claims 1 to 4, characterized in that: The convex area also includes a second curved surface, which protrudes away from the substrate. The second curved surface is located on the side of the first curved surface close to the central axis of the sub-pixel, and the orthographic projection of the second curved surface on the substrate does not overlap with the orthographic projection of the light-emitting functional layer of the sub-pixel edge area on the substrate.

7. The display substrate according to claim 6, characterized in that: The maximum size of the outer contour of the second curved surface projected on the base is approximately equal to the maximum size of the outer contour of the first curved surface projected on the base; or, the maximum size of the outer contour of the second curved surface projected on the base is greater than the maximum size of the outer contour of the first curved surface projected on the base.

8. The display substrate according to claim 6, characterized in that: The angle between the tangent plane of the second curved surface edge and the plane where the base is located is approximately equal to the angle between the tangent plane of the first curved surface edge and the plane where the base is located; or, the angle between the tangent plane of the second curved surface edge and the plane where the base is located is smaller than the angle between the tangent plane of the first curved surface edge and the plane where the base is located.

9. The display substrate according to any one of claims 1 to 4, characterized in that: The surface of the dielectric layer away from the substrate further includes a flat region, the flat region is parallel to the substrate, and the flat region is connected to the edge of the convex region.

10. The display substrate according to any one of claims 1 to 4, characterized in that: The convex region contacts a surface of the first electrode close to the substrate.

11. The display substrate according to any one of claims 1 to 4, characterized in that: The first electrode includes a plurality of conductive patterns stacked in layers, the dielectric layer is disposed between any adjacent conductive patterns, and the convex area of ​​the dielectric layer contacts the conductive pattern located on a side of the dielectric layer away from the substrate.

12. The display substrate according to any one of claims 1 to 4, characterized in that: It also includes a pixel definition layer, in which a pixel opening defining the sub-pixel is provided, the pixel opening exposes at least a portion of the first electrode, the light-emitting functional layer is in contact with the exposed first electrode, the pixel definition layer is provided with an undercut structure, and at least a portion of the film layer of the light-emitting functional layer is cut off at the undercut structure.

13. The display substrate according to claim 12, characterized in that: The light-emitting functional layer includes a plurality of light-emitting units stacked in sequence along a direction away from the substrate and a charge generating layer located between adjacent light-emitting units. The light-emitting unit at least includes a light-emitting layer, and the light-emitting layers and charge generating layers of the plurality of light-emitting units in the light-emitting functional layer are both separated at the bottom cut structure.

14. The display substrate according to any one of claims 1 to 4, characterized in that: The second electrodes of the plurality of sub-pixels are connected as one.

15. A display device, characterized in that: It comprises the display substrate as claimed in any one of claims 1 to 14.

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