Display substrate and display apparatus

Abstract

The present disclosure provides a display substrate and a display apparatus. The display substrate comprises a substrate and pixel units. The pixel units are located on one side of the substrate. Each pixel unit comprises a first electrode, a light-emitting functional layer, and a second electrode. The first electrode is located on one side of the substrate; the light-emitting functional layer is located on the side of the first electrode away from the substrate; and the second electrode is located on the side of the light-emitting functional layer away from the first electrode. The first electrode, the light-emitting functional layer, and the second electrode form an optical microcavity. One pixel unit comprises a plurality of light-emitting regions. For the plurality of light-emitting regions of a same pixel unit, the cavity length of the optical microcavity has a plurality of different values, thereby overcoming the problems of brightness attenuation and color shift caused by a change in viewing angle.

Description

Display substrate and display device

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese Patent Application No. 202411365567.9, filed on September 27, 2024, and entitled “Display substrate and display device”, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of display, and in particular, to a display substrate and a display device. BACKGROUND

[0004] An organic light emitting diode (OLED) display device has the characteristics of self-illumination, fast response speed, wide viewing angle, high definition, high brightness, bendability, and low power consumption, and is increasingly applied in the field of display technology.

[0005] In the process of designing a pixel of a conventional OLED display device, the display effect in a normal viewing angle range is mainly considered. When the viewing angle changes, for example, in a large viewing angle such as a side view, there are problems of too large luminance decay and color deviation, which affect the display effect in a large viewing angle. SUMMARY

[0006] The present disclosure provides a display substrate and a display device to overcome the problems of luminance decay and color deviation caused by changes in viewing angle.

[0007] In a first aspect, the present disclosure provides a display substrate, comprising:

[0008] a substrate;

[0009] a pixel unit located on one side of the substrate; each pixel unit comprises:

[0010] a first electrode located on one side of the substrate;

[0011] a light-emitting functional layer located on a side of the first electrode away from the substrate;

[0012] a second electrode located on a side of the light-emitting functional layer away from the first electrode;

[0013] The first electrode, the light-emitting functional layer, and the second electrode form an optical microcavity; one pixel unit comprises a plurality of light-emitting regions, and for the plurality of light-emitting regions of the same pixel unit, the cavity length of the optical microcavity has a plurality of different values.

[0014] In some embodiments, the display substrate further comprises:

[0015] A pixel defining layer is located on one side of the substrate; the pixel defining layer is provided with a pixel opening; the pixel unit is located in the pixel opening;

[0016] A protruding structure is located in the pixel opening; the protruding structure comprises a side surface inclined relative to the substrate, one end of the side surface close to the substrate being a bottom end of the protruding structure, and an included angle between the side surface and the substrate being an acute angle;

[0017] The first electrode, the light-emitting functional layer, and the second electrode cover the side surface of the protruding structure and the region between the bottom ends of adjacent protruding structures.

[0018] In some embodiments, the thicknesses of the first electrode, the light-emitting functional layer, and the second electrode corresponding to the region between the bottom ends of adjacent protruding structures are greater than the thicknesses of the first electrode, the light-emitting functional layer, and the second electrode corresponding to the side surface, respectively.

[0019] In some embodiments, the thickness of the light-emitting functional layer corresponding to the region between the bottom ends of adjacent protruding structures and the thickness of the light-emitting functional layer corresponding to the side surface satisfy the following relationship: H2=H1×cosα.

[0020] Wherein H1 represents the thickness of the light-emitting functional layer corresponding to the region between the bottom ends of adjacent protruding structures, H2 represents the thickness of the light-emitting functional layer corresponding to the side surface, and α represents the included angle between the side surface and the substrate.

[0021] In some embodiments, a plurality of protruding structures are arranged in the same pixel opening;

[0022] The protruding structures in the same pixel opening have the same three-dimensional shape and size;

[0023] In the plurality of protruding structures arranged in any direction in the same pixel opening, the distance between the bottom ends of any two adjacent protruding structures is the same.

[0024] In some embodiments, a plurality of protruding structures are arranged in the same pixel opening;

[0025] In the same pixel opening, the included angle between the side surface of the protruding structure and the substrate has a plurality of different values.

[0026] In some embodiments, for at least one protruding structure arranged in the same pixel opening, the included angle between the side surface of the protruding structure and the substrate has a plurality of different values corresponding to a plurality of positions around the protruding structure.

[0027] In some embodiments, for a plurality of protruding structures arranged in the same pixel opening, the included angle between the side surface of any protruding structure and the substrate at a set position is different from the included angle between the side surface of another protruding structure and the substrate at a corresponding position.

[0028] In some embodiments, for the plurality of protruding structures arranged in the same pixel opening, the height of at least two protruding structures is different.

[0029] In some embodiments, for the plurality of protruding structures arranged in the same pixel opening, the distance between the bottom ends of at least some adjacent protruding structures arranged in a set direction is different.

[0030] In some embodiments, for the plurality of protruding structures arranged in the same pixel opening, the shape of at least some protruding structures is conical.

[0031] The end of the side surface away from the substrate is the top end of the protruding structure, and the side surface converges at a point at the top end.

[0032] In some embodiments, the cone includes at least one of a circular cone and a pyramid.

[0033] In some embodiments, for the plurality of protruding structures arranged in the same pixel opening, the shape of at least some protruding structures is trapezoidal; the trapezoidal protruding structure further includes a top surface parallel to the substrate; the top surface is located at the end of the side surface away from the substrate and connected with the side surface.

[0034] The first electrode further covers the top surface of the protruding structure; the width of the top surface of at least some protruding structures in a set direction is different.

[0035] In some embodiments, the trapezoid includes at least one of a circular trapezoid and a pyramid.

[0036] In some embodiments, the first electrode further covers part of the side wall of the pixel defining layer.

[0037] In some embodiments, the first electrode and the side wall of the pixel defining layer are not in contact with each other.

[0038] In some embodiments, the protruding structure and the pixel defining layer are located in the same layer.

[0039] In some embodiments, for any protruding structure, the inner side angle formed by the side surface and the substrate is between 20° and 80°.

[0040] In some embodiments, the display substrate further includes:

[0041] The pixel defining layer is located on one side of the substrate; the first electrode is located between the pixel defining layer and the substrate.

[0042] The pixel defining layer includes a plurality of pixel regions, one pixel region corresponding to one pixel unit, and a plurality of openings are arranged in one pixel region, and the openings expose the corresponding first electrode; one opening corresponds to one light emitting region of the pixel unit, and the light emitting functional layer and the second electrode in each light emitting region are arranged in the corresponding opening.

[0043] In some embodiments, the thickness of the light-emitting functional layer in the plurality of openings has a plurality of different values for the same pixel region.

[0044] In some embodiments, the first electrode comprises a reflective conductive layer and a transparent conductive layer, the transparent conductive layer is located between the reflective conductive layer and the light-emitting functional layer; the thickness of the transparent conductive layer exposed by the plurality of openings has a plurality of different values for the same pixel region.

[0045] In a second aspect, the present disclosure provides a display device comprising the display substrate of any one of the above.

[0046] The present disclosure has the following advantages:

[0047] The present disclosure provides a display substrate and a display device. The display substrate comprises a substrate and a pixel unit. The pixel unit is located on one side of the substrate. Each pixel unit comprises a first electrode, a light-emitting functional layer, and a second electrode. The first electrode is located on one side of the substrate; the light-emitting functional layer is located on a side of the first electrode away from the substrate; and the second electrode is located on a side of the light-emitting functional layer away from the first electrode. The first electrode, the light-emitting functional layer, and the second electrode form an optical microcavity. One pixel unit comprises a plurality of light-emitting regions. The cavity length of the optical microcavity has a plurality of different values for the plurality of light-emitting regions of the same pixel unit. Therefore, the light-emitting brightness of a plurality of viewing angles can be compensated by a plurality of light-emitting regions with different cavity lengths, and the problems of brightness decay and color deviation caused by changes in viewing angle can be overcome. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed in the embodiments of the present disclosure will be briefly introduced below. Obviously, the drawings introduced below are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0049] FIG. 1 is a schematic diagram of the mechanism of large viewing angle color deviation of an OLED device;

[0050] FIG. 2 is a schematic diagram of the cross-sectional structure of a display substrate according to an embodiment of the present disclosure;

[0051] FIG. 3 is a schematic diagram of the cross-sectional structure of a display substrate according to another embodiment of the present disclosure;

[0052] FIG. 4 is a schematic diagram of the cross-sectional structure of a display substrate according to another embodiment of the present disclosure;

[0053] FIG. 5 is a schematic diagram of the cross-sectional structure of a display substrate according to another embodiment of the present disclosure;

[0054] FIG. 6 is a schematic diagram of the cross-sectional structure of a display substrate according to another embodiment of the present disclosure;

[0055] FIG. 7 is a top view of a protrusion structure according to an embodiment of the present disclosure;

[0056] FIG. 8 is a cross-sectional view of a protrusion structure according to an embodiment of the present disclosure;

[0057] FIG. 9 is a cross-sectional view of a display substrate according to an embodiment of the present disclosure;

[0058] FIG. 10 is a cross-sectional view of a display substrate according to an embodiment of the present disclosure;

[0059] FIG. 11 is a cross-sectional view of a display substrate according to an embodiment of the present disclosure;

[0060] FIG. 12 is a cross-sectional view of a display substrate according to an embodiment of the present disclosure;

[0061] FIG. 13 is a cross-sectional view of a display substrate according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0062] In order to make the above objectives, features and advantages of the present disclosure more obvious and easy to understand, the present disclosure will be further described below with reference to the drawings and embodiments. However, the example embodiments can be implemented in various forms, and should not be understood as being limited to the embodiments set forth herein; on the contrary, these embodiments are provided to make the present disclosure more comprehensive and complete, and to fully convey the ideas of the example embodiments to those skilled in the art. The same reference signs in the drawings represent the same or similar structures, so repeated descriptions thereof will be omitted. The expressions of position and direction described in the present disclosure are described with reference to the drawings, but changes can be made as needed, and the changes made are included in the protection scope of the present disclosure. The drawings of the present disclosure are only used to illustrate the relative positional relationship and do not represent the true proportions.

[0063] An organic light emitting diode (OLED) display device has the characteristics of self-emission, fast response speed, wide viewing angle, high definition, high brightness, bendability, and low power consumption, and is increasingly applied in the field of display technology.

[0064] In the process of designing a pixel of a conventional OLED display device, the display effect in a normal viewing angle range is mainly considered, and when viewed at a large viewing angle such as a side view, there is a problem of excessive luminance decay and color shift, which affects the display effect of large viewing angle viewing.

[0065] FIG. 1 is a schematic diagram of a large viewing angle color shift mechanism of an OLED device.

[0066] The above phenomenon can be explained from the OLED structure. As shown in FIG. 1, in the related art, an OLED device generally includes an anode A, a cathode C, and a light-emitting functional layer E between the anode A and the cathode C. The anode A is generally a reflective film, and the cathode C is generally a semi-transparent film. The anode A and the light-emitting functional layer E form two reflective surfaces, and the cathode C and the light-emitting functional layer E form two reflective surfaces, resulting in a significant microcavity effect inside the OLED device. Light interference occurs in the microcavity. By controlling the length of the microcavity, the wavelength of the light that is in phase can be controlled. At different viewing angles, the wavelength that is in phase satisfies the microcavity formula:

[0067] wherein L is the distance between the anode A and the cathode C, Q is the phase difference of the reflective surface, m is the mode number, λ is the wavelength that is in phase, and θ is the reflection angle of the light when reflected on the reflective surface. The size of θ is positively correlated with the size of the viewing angle. As can be seen from the above formula, for the same OLED device, L and Q are constant, and the wavelength that is in phase depends on the size of cosθ when m takes a fixed value. When the viewing angle is larger, the reflection angle θ is larger, and the size of cosθ is larger, so the value of the wavelength λ that is in phase is smaller. That is, as the viewing angle increases, the wavelength corresponding to the best anti-node at different viewing angles is blue-shifted. Therefore, the wavelength with the best anti-node at the normal viewing angle decreases in light-emitting efficiency as the viewing angle increases, resulting in a decrease in brightness at a large viewing angle. For example, the peak wavelength of the light emitted by the OLED device has the best anti-node at the normal viewing angle, that is, the light-emitting efficiency of the peak wavelength of the light emitted by the OLED device is the largest at the normal viewing angle. As the viewing angle increases, the light-emitting efficiency of the peak wavelength of the light emitted by the OLED device decreases, the proportion of the peak wavelength in the emission spectrum of the OLED device decreases, and the proportion of other wavelengths increases, resulting in a change in the emission spectrum of the OLED device at a large viewing angle compared with the normal viewing angle, and finally causing a color shift problem.

[0068] In a first aspect of the present disclosure, a display substrate is provided to solve the above problems.

[0069] FIG. 2 is a schematic view of a cross-sectional structure of a display substrate according to an embodiment of the present disclosure.

[0070] In an embodiment of the present disclosure, as shown in FIG. 2, the display substrate includes a substrate 10 and a pixel unit 11.

[0071] The substrate 10 is located at the bottom of the display substrate and is used to support and carry other film layers located thereon. The shape and size of the substrate 10 are adapted to the shape and size of the display substrate. Generally, the shape of the substrate 10 can be square, rectangular, etc., and when applied to a special-shaped display, the shape of the substrate 10 can also be a special shape such as a circle, etc., which is not limited herein. The material of the substrate 10 can be a rigid material such as glass, etc. to make a rigid display substrate. The material of the substrate 10 can also be a flexible material such as polyimide (PI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), etc. to make a flexible display substrate. The flexible substrate 10 can be a single-layer structure or a multi-layer structure. When the substrate 10 adopts a multi-layer structure, a laminated structure in which organic film layers and inorganic film layers are arranged alternately can be adopted, and the inorganic film layers are located between adjacent organic film layers and can play a buffering role. The inorganic film layers can be a single material or a composite material such as silicon nitride (SiN x ), silicon oxide (SiO x ), etc., which is not limited herein.

[0072] The pixel unit 11 is located on one side of the substrate 10. The pixel unit 11 is used to emit light for image display. In specific implementation, the display substrate can include a plurality of pixel units, and the more the number of pixel units, the higher the resolution of the image that the display substrate can display. The display substrate can also include a plurality of pixel units for emitting light of different colors. For example, the display substrate can include red pixel units, green pixel units and blue pixel units, which can emit light together during image display, thereby realizing color display. The display substrate can also include only one kind of pixel unit, thereby being used to display a monochrome image, which is not limited herein. It should be noted that one pixel unit is taken as an example in the embodiments of the present disclosure to describe the specific structure of the display substrate.

[0073] As shown in FIG. 2, the pixel unit 11 includes a first electrode 111, a light-emitting functional layer 112, and a second electrode 113. The first electrode 111, the light-emitting functional layer 112, and the second electrode 113 form a light-emitting device, where the first electrode 111 is usually an anode of the light-emitting device, and the second electrode 113 is usually a cathode of the light-emitting device, or the first electrode 111 can also be a cathode of the light-emitting device, and the second electrode 113 can also be an anode of the light-emitting device, which is not limited herein. For example, the light-emitting device formed by the first electrode 111, the light-emitting functional layer 112, and the second electrode 113 can be an OLED device, where the first electrode 111 can be an anode of the OLED device, and the second electrode 113 can be a cathode of the OLED device, and the light-emitting functional layer 112 can specifically include a hole injection layer HIL, a hole transport layer HTL, an organic light-emitting layer EML, an electron transport layer ETL, and an electron injection layer EIL, which are sequentially stacked in a direction from the first electrode 111 to the second electrode 113, and the like, and the light-emitting functional layer 112 can also include other film layers for realizing or improving specific functions in specific implementations, which is not limited herein. In some embodiments, the light-emitting device formed by the first electrode 111, the light-emitting functional layer 112, and the second electrode 113 can also be a light-emitting device with a similar structure, such as a quantum dot light-emitting diode (QLED), which is not limited herein.

[0074] In the embodiments of the present disclosure, the first electrode 111, the light-emitting functional layer 112, and the second electrode 113 form an optical microcavity inside the pixel unit 11.

[0075] For example, in some embodiments, such as in a top emission display substrate, the first electrode 111 of the light emitting device is made of a material with strong reflective properties, so that the light emitted by the light emitting functional layer 112 can be reflected, improving the utilization of light. Specifically, the first electrode 111 can be made of a thick metal electrode, such as a silver (Ag) electrode, a gold (Au) electrode, and a silver / gold (Ag / Au) composite electrode, etc., to improve the reflective performance of the first electrode. When the first electrode 111 is made of a thick metal electrode, the interface between the first electrode 111 and the light emitting functional layer 112 forms a reflective surface. The second electrode 113 is made of a semi-transparent and semi-reflective material, such as a thin metal electrode, such as a magnesium / silver (Mg / Ag) alloy, etc., without limitation, so that part of the light can be transmitted through the second electrode 113 to the outside of the light emitting device for emission, while the interface between the second electrode 113 and the light emitting functional layer 112 forms a reflective surface. The optical microcavity of the pixel unit 11 is formed between the emission surface of the first electrode 111 and the reflective surface of the second electrode 113, and the cavity length of the optical microcavity is the vertical distance between the reflective surface of the first electrode 111 and the reflective surface of the second electrode 113. Specifically, the cavity length of the optical microcavity is approximately equal to the thickness of the light emitting functional layer 112.

[0076] In some embodiments, such as in a top emission display substrate, the first electrode 111 can also reflect the composite electrode structure of the conductive layer and the transparent conductive layer. For example, the first electrode 111 can include a metal layer and a transparent indium tin oxide (ITO) layer disposed between the metal layer and the light emitting functional layer 112, wherein the metal layer has a large thickness to serve as a reflective conductive layer to improve the reflective performance, and the ITO layer has a high work function to improve the hole injection efficiency. When the first electrode 111 is made of a composite electrode of a metal layer and a transparent metal oxide layer, the interface between the metal layer and the transparent metal oxide layer forms a reflective surface. The second electrode 113 is made of a semi-transparent and semi-reflective material, such as a thin metal electrode, such as a magnesium / silver (Mg / Ag) alloy, etc., without limitation, so that part of the light can be transmitted through the second electrode 113 to the outside of the light emitting device for emission, while the interface between the second electrode 113 and the light emitting functional layer 112 forms a reflective surface. The optical microcavity of the pixel unit 11 is formed between the reflective surface of the first electrode 111 and the reflective surface of the second electrode 113, and the cavity length of the optical microcavity is the vertical distance between the reflective surface of the first electrode 111 and the reflective surface of the second electrode 113. Specifically, the cavity length of the optical microcavity is approximately equal to the sum of the thickness of the transparent conductive layer in the first electrode 111 and the thickness of the light emitting functional layer 112.

[0077] In some embodiments, for example in a top-emission display substrate, the first electrode 111 of the light-emitting device is made of a material with strong reflective properties, the specific material can refer to the foregoing, and will not be described here. The interface between the first electrode 111 and the light-emitting functional layer 112 forms a reflective surface. The second electrode 113 is made of a transparent material, and the second electrode 113 has high transmittance, thereby forming a weak microcavity structure with the reflective surface of the first electrode 111, and the length of the optical microcavity inside the pixel unit 11 is about the sum of the thicknesses of the light-emitting functional layer 112 and the second electrode 113.

[0078] In some embodiments, for example in a bottom-emission display substrate, the first electrode 111 of the light-emitting device can be made of a transparent material, or made of a semi-transparent and semi-reflective material, and the second electrode 111 of the light-emitting device can be made of a material with strong reflective properties, or a composite electrode structure formed by stacking a reflective conductive layer and a transparent conductive layer, which is not limited here. Specifically, the structure of the light-emitting device in the bottom-emission display substrate can be obtained by inverting the structure of the light-emitting device in the top-emission display substrate, and the cavity length of the optical microcavity inside the light-emitting device in the bottom-emission display substrate can refer to the top-emission display substrate.

[0079] In specific implementation, according to different specific film layer structures of the pixel unit, the specific structure of the optical microcavity formed inside the pixel unit can also change accordingly, which is not limited here. By adjusting the cavity length of the optical microcavity, the light emitted by the light-emitting functional layer 122 can be oscillated in the optical microcavity to interfere constructively to improve the light emission efficiency.

[0080] In the embodiments of the present disclosure, one pixel unit 11 includes a plurality of light-emitting regions. For the plurality of light-emitting regions of the same pixel unit, the cavity length of the optical microcavity has a plurality of different values, so that the light spectrum emitted from the light-emitting regions with different cavity lengths is different under the same viewing angle. Under a large viewing angle, optical compensation can be performed through the plurality of light-emitting regions to reduce the problems of brightness decay and color deviation caused by changes in viewing angle.

[0081] For example, as shown in FIG. 2, for example, the same pixel unit includes a first light emitting region S1, a second light emitting region S2 and a third light emitting region S3, and for the multiple light emitting regions of the same pixel unit 11, the cavity length of the optical microcavity has multiple different values, for example, in the first light emitting region S1 of the pixel unit 11, the optical microcavity has a first cavity length L1, in the second light emitting region S2 of the pixel unit 11, the optical microcavity has a second cavity length L2, and in the third light emitting region S3 of the pixel unit 11, the optical microcavity has a third cavity length L3. It should be noted that in the embodiment shown in FIG. 2, only the optical microcavity formed by the light emitting functional layer 112 between the first electrode 111 and the second electrode 113 is exemplified, and this is not as a limitation on the embodiments of the present disclosure. The case where the optical microcavity formed inside the pixel unit 11 is of other structures is similar, and will not be described here.

[0082] Specifically, according to the aforementioned microcavity formula: For the same pixel unit, at the normal viewing angle, the coherent constructive wavelength of different light emitting regions depends on the cavity length of the optical microcavity in the region. For example, the cavity lengths of the optical microcavities of the first light emitting region S1 and the third light emitting region S3 are the same, so at the normal viewing angle, the coherent constructive wavelengths of the first light emitting region S1 and the third light emitting region S3 are both the first wavelength λ1, the cavity length of the optical microcavity of the second light emitting region S2 is smaller than that of the first light emitting region S1, so the coherent constructive wavelength of the second light emitting region S2 is the second wavelength λ2, which is smaller than the first wavelength λ1. The spectrum of the light emitted by the first light emitting region S1 and the third light emitting region S3 is the same or similar, and the spectrum of the light emitted by the first light emitting region S1 and the third light emitting region S3 is different from the spectrum of the light emitted by the second light emitting region S2. As the viewing angle increases, the coherent constructive wavelengths of the first light emitting region S1, the second light emitting region S2 and the third light emitting region S3 all gradually decrease, and when the viewing angle increases to a certain specific viewing angle V2, the coherent constructive wavelengths of the first light emitting region S1 and the third light emitting region S3 just decrease to the size of the second wavelength λ2. Therefore, in the specific design, the peak wavelength of the light emitted by the pixel unit 11 can be designed to be λ2, so that at the normal viewing angle, the light of the peak wavelength emitted by the pixel unit 11 can be coherent and constructive in the second light emitting region S2, thereby improving the light emitting efficiency at the normal viewing angle and improving the brightness at the normal viewing angle. When the viewing angle increases to the specific viewing angle V2, the light of the peak wavelength emitted by the pixel unit 11 can be coherent and constructive in the first light emitting region S1 and the third light emitting region S3, thereby improving the light emitting efficiency of the light of the peak wavelength at the specific viewing angle V2 and compensating for the brightness at large viewing angles. And when viewed at the specific viewing angle V2, the proportion of the peak wavelength in the spectrum of the light emitted by the pixel unit 11 is the same or similar to the proportion of the peak wavelength in the spectrum of the light emitted at the normal viewing angle, thereby overcoming the color deviation problem at the specific viewing angle V2.

[0083] In specific implementation, the cavity length of the optical microcavity of the first light emitting region S1 and the third light emitting region S3 can be different, and the cavity length of the optical microcavity of the third light emitting region S3 is smaller than the optical cavity length of the first light emitting region S1 and larger than the cavity length of the optical microcavity of the second light emitting region S3, so that the problem of brightness decay and color deviation can be overcome at a certain intermediate viewing angle between the normal viewing angle V1 and the specific viewing angle V2.

[0084] Since the brightness at different viewing angles is also affected by the area of the light emitting region, in specific implementation, the brightness and color deviation at different viewing angles can be adjusted by adjusting the area of the light emitting region with different optical cavity lengths.

[0085] As can be seen from the above analysis, the more light emitting regions included in the same pixel unit and the more cavity lengths of the optical microcavities of the light emitting regions in the same pixel unit, the more viewing angles can be compensated for brightness at a large viewing angle, so that the brightness of multiple large viewing angles can be compensated for by setting multiple light emitting regions with different cavity lengths in the same pixel unit, and the problem of brightness decay and color deviation caused by viewing angle change can be reduced.

[0086] FIG. 3 is a schematic view of a cross-sectional structure of a display substrate according to an embodiment of the present disclosure.

[0087] In some embodiments, as shown in FIG. 3, the display substrate further includes a pixel defining layer 12 and a protruding structure 13.

[0088] The pixel defining layer 12 is located on one side of the substrate 10. The pixel defining layer 12 is provided with a pixel opening K1, and the pixel unit 11 is located in the pixel opening K1. In specific implementation, one pixel opening K1 corresponds to one pixel unit 11, and the pixel unit 11 is arranged in the corresponding pixel opening K1, and two adjacent pixel units 11 are separated by the pixel defining layer 12 between the two adjacent pixel openings K1.

[0089] The protruding structure 13 is located in the pixel opening K1. The protruding structure 13 includes a side surface 121 inclined relative to the substrate 10, and one end of the side surface 121 close to the substrate 10 is the bottom end 1211 of the protruding structure 13, and the inner side angle α formed by the side surface 121 and the substrate 10 is an acute angle. The inner side angle α formed by the side surface 121 and the substrate 10, specifically refers to the angle formed by the side surface of the protruding structure 13 and the substrate 10 inside the protruding structure 13.

[0090] As shown in FIG. 3, the first electrode 111, the light-emitting functional layer 112 and the second electrode 113 of the pixel unit 11 cover the side surface 121 of the protruding structure 13, and cover the area between the bottom ends 1211 of the adjacent two protruding structures 13. The thickness of the first electrode 111, the light-emitting functional layer 112 and the second electrode 113 corresponding to the area between the bottom ends 1211 of the adjacent two protruding structures 13 is greater than the thickness of the first electrode 111, the light-emitting functional layer 112 and the second electrode 113 corresponding to the side surface 121.

[0091] Specifically, after the protruding structure 13 is made on one side of the substrate 10, the first electrode 111, the light-emitting functional layer 112 and the second electrode 113 can be formed on the side of the protruding structure 13 away from the substrate 10 by evaporation. During the evaporation process, the area between the bottom ends 1211 of the adjacent two protruding structures 13 is relatively flat, and the side surface 121 forms a slope compared to the area between the bottom ends 1211 of the adjacent two protruding structures 13. Therefore, the growth rate of the film layer on the area between the bottom ends 1211 of the adjacent two protruding structures 13 is greater than the growth rate on the side surface 121, so that the thickness of the first electrode 111, the light-emitting functional layer 112 and the second electrode 113 corresponding to the area between the bottom ends 1211 of the adjacent two protruding structures 13 is greater than the thickness of the first electrode 111, the light-emitting functional layer 112 and the second electrode 113 corresponding to the side surface 121. For example, the light-emitting functional layer 112 corresponding to the area between the bottom ends 1211 of the adjacent two protruding structures 13 has a first thickness T1, and the light-emitting functional layer 112 corresponding to the side surface 121 has a second thickness T2, and the size of the first thickness T1 is greater than the size of the second thickness T2.

[0092] In specific implementation, when the light-emitting functional layer 112 is formed on the side of the protruding structure 13 away from the substrate 10 by evaporation, the thickness of the light-emitting functional layer 112 corresponding to the area between the bottom ends 1311 of the adjacent two protruding structures 13 and the thickness of the light-emitting functional layer 112 corresponding to the side surface 131 approximately satisfy T2=T1×cosα. The thickness of the first electrode 111 corresponding to the area between the bottom ends 1311 of the adjacent two protruding structures 13 and the thickness of the first electrode 111 corresponding to the side surface 131, and the thickness of the second electrode 113 corresponding to the area between the bottom ends 1311 of the adjacent two protruding structures 13 and the thickness of the second electrode 113 corresponding to the side surface 131 also approximately satisfy the above relationship, which will not be described herein. The inner side angle α formed by the side surface 121 and the substrate 10 can be between 20° and 80°. By adjusting the size of the inner side angle α formed by the side surface 121 and the substrate 10, the brightness and color deviation problems of a specific viewing angle can be improved.

[0093] After the protruding structure 13 is made on one side of the substrate 10, the first electrode 111, the light-emitting functional layer 112 and the second electrode 113 are made on the side of the protruding structure 13 away from the substrate 10 by evaporation, so that the same pixel unit 11 can form light-emitting areas with different thicknesses in the area corresponding to the side 121 and the area between the bottom ends 1211 of the two adjacent protruding structures 13, the cavity lengths of the optical microcavities formed by the light-emitting areas with different thicknesses are different, so that the luminance of multiple large viewing angles can be compensated, and the problems of luminance decay and color deviation caused by viewing angle change can be reduced.

[0094] In addition, by making the first electrode 111 on the side of the protruding structure 13 away from the substrate 10, the protruding surface of the protruding structure 13 can significantly increase the area of the first electrode 111, and the effective light-emitting area of the pixel unit 11 is generally proportional to the area of the first electrode 111, so that increasing the area of the first electrode 111 is beneficial to increasing the aperture ratio and improving the brightness of the display panel. And according to the light-emitting luminance formula of the pixel unit: Where B represents the light-emitting luminance of the pixel unit, η represents the device efficiency of the pixel unit (light-emitting device), I is the current size, S represents the area of the pixel opening, and R represents the aperture ratio. The current density is represented by the formula, and the larger the current density is, the shorter the service life of the pixel unit is. As can be seen from the above formula, under the same luminance, increasing the aperture ratio R is beneficial to reducing the current density and prolonging the service life of the pixel unit; on the contrary, under the premise of ensuring the service life of the pixel unit, that is, the current density is unchanged, it is beneficial to improve the light-emitting luminance.

[0095] FIG. 4 is a schematic view of a cross-sectional structure of a display substrate according to an embodiment of the present disclosure.

[0096] In some embodiments, as shown in FIG. 4, the first electrode 111 also covers part of the side wall 121 of the pixel defining layer 12, so that the light-emitting area of the pixel unit 11 can be further increased, which is beneficial to further improve the pixel aperture ratio of the display substrate and improve the brightness of the display panel.

[0097] FIG. 5 is a schematic view of a cross-sectional structure of a display substrate according to an embodiment of the present disclosure.

[0098] In some embodiments, as shown in FIG. 5, the first electrode 111 and the side wall 121 of the pixel defining layer 12 are not in contact with each other. Specifically, by reducing the area of the first electrode 111, edge light leakage caused by the light-emitting area of the pixel unit being too large can be avoided, and in turn, light crosstalk between adjacent two pixel units can be avoided.

[0099] In some embodiments, the protruding structure 13 and the pixel defining layer 12 can be arranged in the same layer. Specifically, the protruding structure 13 and the pixel defining layer 12 are arranged in the same layer, specifically, the protruding structure 13 and the pixel defining layer 12 can be formed by etching the same film layer in the same mask process, thereby facilitating to reduce the etching process and improve the manufacturing efficiency. In a specific implementation, a driving circuit layer is further arranged between the pixel defining layer 12 and the substrate 10, and the driving circuit layer is provided with a pixel circuit (not shown in the figure) for driving the pixel unit 11. After the protruding structure 13 and the pixel defining layer 12 are manufactured, a via (not shown in the figure) for connecting the first electrode 111 and the pixel circuit can be formed in the area of the pixel opening K1, and then the first electrode 111, the light-emitting functional layer 112 and the second electrode 113 are sequentially evaporated in the pixel opening K1, wherein the first electrode is connected to the pixel circuit through the via. In a specific implementation, the display substrate can be manufactured according to the specific structure of the display substrate and in reference to the related technology, and thus the detailed description is omitted here.

[0100] In some embodiments, the protruding structure 13 and the pixel defining layer 12 can also be arranged in different film layers. For example, in a specific implementation, the protruding structure 13 can be manufactured on the side of the driving circuit layer (not shown in the figure) away from the substrate 10, and then a via (not shown in the figure) for connecting the first electrode 111 and the pixel circuit is formed; then the first electrode 111 is manufactured on the side of the protruding structure 13 away from the driving circuit layer, and the first electrode 111 is connected to the pixel circuit through the via; then the pixel defining layer 12 is manufactured on the side of the first electrode 111 away from the substrate 10 in reference to the related technology, and the pixel opening K1 exposing the first electrode 111 is formed in the pixel defining layer 12, and the light-emitting functional layer 112 and the second electrode 113 are sequentially evaporated in the pixel opening K1. In a specific implementation, the display substrate can be manufactured according to the specific structure of the display substrate and in reference to the related technology, and thus the detailed description is omitted here.

[0101] FIG. 6 is a schematic view of a cross-sectional structure of a display substrate according to an embodiment of the present disclosure.

[0102] In some embodiments, as shown in FIG. 6, a plurality of protruding structures 13 are arranged in the same pixel opening K1. In practical implementation, the protruding structures 13 in the same pixel opening K1 can have the same three-dimensional shape and size, so as to reduce the difficulty of mask design and the difficulty of manufacturing the display substrate. Specifically, the plurality of protruding structures 13 have the same three-dimensional shape and size, specifically, the plurality of protruding structures 13 have the same three-dimensional shape, for example, all are circular truncated pyramid, prismatic truncated pyramid, circular cone or prismatic cone, and have the same size. As shown in FIG. 6, the shape and size of the protruding structure 13 mainly depend on the size of the inner side angle a formed by the side surface 131 of the protruding structure 13 and the substrate 10, the height of the protruding structure 13 and the width W1 of the bottom end of the protruding structure 13. The height of the protruding structure 13 specifically refers to the vertical distance between the bottom end 1311 of the protruding structure 13 and the top end of the protruding structure 13, wherein the top end of the protruding structure 13 is the end of the side surface 131 of the protruding structure 13 away from the substrate 10. The width W1 of the bottom end of the protruding structure 13 specifically refers to the width of the bottom end 1311 of the protruding structure 13 on a cross section of the protruding structure 13 in a specific direction, the cross section is perpendicular to the substrate 10 and passes through the geometric center of the figure formed by the orthographic projection of the bottom end 1311 of the protruding structure 13 on the substrate 10, and it should be noted that the specific direction can be any direction, and when comparing the widths W1 of the bottom ends of the plurality of protruding structures 13, the same direction is taken for the plurality of protruding structures 13. In practical implementation, the plurality of protruding structures 13 have the same size, specifically, the plurality of protruding structures 13 can have the same size of the inner side angle a formed by the side surface 131 of the protruding structure 13 and the substrate 10, the same height of the protruding structure 13 and the same width W1 of the bottom end of the protruding structure 13.

[0103] In some embodiments, as shown in FIG. 6, the distance W2 between the bottom ends 1311 of any two adjacent protruding structures 13 in the plurality of protruding structures 13 arranged in any direction in the same pixel opening K1 can be the same, so as to reduce the difficulty of mask design and the difficulty of manufacturing the display substrate. It should be noted that the plurality of protruding structures 13 arranged in any direction in the embodiments of the present disclosure specifically refer to that the geometric centers of the orthographic projection shapes of the bottom ends of the plurality of protruding structures 13 on the substrate 10 are located on or approximately located on the same straight line, and the extension direction of the straight line is the arrangement direction of the plurality of protruding structures 13.

[0104] In some embodiments, multiple protruding structures are arranged in the same pixel opening, and the inner side angles formed by the side surfaces of the protruding structures and the substrate have multiple different values in the same pixel opening. Specifically, the inner side angles formed by the side surfaces of the protruding structures and the substrate have multiple different values in the same pixel opening can include the case that the inner side angles formed by the side surfaces of the same protruding structure and the substrate have multiple different values, and / or the case that the inner side angles formed by the side surfaces of different protruding structures and the substrate at corresponding positions have multiple different values, which will be described in detail later. By arranging the inner side angles formed by the side surfaces of the protruding structures and the substrate to have multiple different values in the same pixel opening, according to the aforementioned film thickness relationship formula: T2=T1xcos a, it can be known that the film thicknesses of the first electrode, the light-emitting functional layer and the second electrode formed on the multiple side surfaces having different inner side angles with the substrate are all different, so that multiple light-emitting regions with different thicknesses can be formed on the multiple side surfaces respectively, the cavity lengths of the optical microcavities formed in each light-emitting region are different, thereby being beneficial to compensate the light-emitting brightness of the display substrate at more viewing angles, and further reducing the problems of brightness decay and color deviation caused by viewing angle change. The more the values of the inner side angles formed by the side surfaces of the protruding structures and the substrate in the same pixel opening, the more obvious the improvement of the brightness decay and color deviation problems at different viewing angles.

[0105] FIG. 7 is a top view of a protruding structure according to an embodiment of the present disclosure; and FIG. 8 is a cross-sectional view of the protruding structure according to an embodiment of the present disclosure.

[0106] In some embodiments, for the at least one protruding structure arranged in the same pixel opening, the inner side angle formed by the side surface of the protruding structure and the substrate has different values corresponding to the plurality of positions around the protruding structure. For example, as shown in FIG. 7, the protruding structure can have a quadrangular pyramid shape, the side surface of the protruding structure corresponding to the four sides of the quadrangle is divided into a first side surface 131A, a second side surface 131B, a third side surface 131C and a fourth side surface 131D, and the inner side angle formed by the first side surface 131A, the second side surface 131B, the third side surface 131C and the fourth side surface 131D and the substrate has different values around the protruding structure. FIG. 8 is a sectional view of FIG. 7 along the section line A-A, and specifically, as shown in FIG. 8, the inner side angle formed by the fourth side surface 131D and the substrate has a first value a1, the inner side angle formed by the second side surface 131B and the substrate has a second value a2, and the first value a1 is smaller than the second value a2. When the protruding structure has other shapes, similar arrangements can be made according to the embodiments shown in FIG. 7 and FIG. 8, which will not be described herein. In specific implementation, the specific number or proportion of the number of the protruding structures having similar arrangements shown in FIG. 7 and FIG. 8 in the same pixel opening can be adjusted according to actual conditions, which will not be limited herein.

[0107] FIG. 9 is a schematic view of a cross-sectional structure of a display substrate according to an embodiment of the present disclosure.

[0108] In some embodiments, for the plurality of protruding structures arranged in the same pixel opening, the inner side angle formed by the side surface of any protruding structure and the substrate at a set position has a value different from the inner side angle formed by the side surface of at least one other protruding structure and the substrate at a corresponding position. For example, as shown in FIG. 9, the plurality of protruding structures arranged in the same pixel opening K1 includes a first protruding structure 13A and a second protruding structure 13B, wherein the inner side angle formed by the side surface of the first protruding structure 13A and the substrate 10 at a set position has a first value a1, the inner side angle formed by the side surface of the second protruding structure 13B and the substrate 10 at a corresponding position has a second value a2, and the first value a1 is smaller than the second value a2. The set position of the first protruding structure 13A is projected onto a first point on the substrate 10, the geometric center of the projection of the bottom end of the first protruding structure 13A on the substrate 10 is located at a second point, the corresponding position of the second protruding structure 13B is projected onto a third point on the substrate 10, the geometric center of the projection of the bottom end of the second protruding structure 13B on the substrate 10 is located at a fourth point, the line connecting the third point and the fourth point is parallel or approximately parallel to the line connecting the second point and the first point, and the direction from the second point to the first point is the same as or approximately the same as the direction from the fourth point to the third point.

[0109] FIG. 10 is a schematic view of a cross-sectional structure of a display substrate according to an embodiment of the present disclosure.

[0110] In some embodiments, for the plurality of protruding structures arranged in the same pixel opening, the height of at least two protruding structures can be different. For example, as shown in FIG. 10, the plurality of protruding structures arranged in the same pixel opening includes a first protruding structure 13A and a third protruding structure 13B, wherein the first protruding structure 13A has a first height H1, and the third protruding structure 13C has a second height H2, and the second height H2 is greater than the first height H1. By adjusting the height of the protruding structure, the area of the side surface of the protruding structure can be adjusted, thereby further adjusting the light emitting brightness of the light emitting area corresponding to the side surface of the protruding structure. In specific implementation, the height of the plurality of protruding structures arranged in the same pixel opening does not have to be the same, but the height of the plurality of protruding structures can be adjusted individually, so that the light emitting brightness of the display substrate at each viewing angle is more uniform. In specific implementation, the adjustment can be made according to the specific structure of the display substrate, which is not limited herein.

[0111] In some embodiments, for the plurality of protruding structures arranged in the same pixel opening, the distance between the bottom ends of at least some adjacent protruding structures among the plurality of protruding structures arranged in a set direction can be different. For example, as shown in FIG. 10, the plurality of protruding structures arranged in the same pixel opening K1 includes a first protruding structure 13A, a second protruding structure 13B, and a third protruding structure 13C, which are arranged in a set direction and adjacent to each other. The set direction can be any direction, and the arrangement of the first protruding structure 13A, the second protruding structure 13B, and the third protruding structure 13C in the set direction specifically means that the geometric center of the orthographic projection shape of the bottom end of the first protruding structure 13A on the substrate, the geometric center of the orthographic projection shape of the bottom end of the second protruding structure 13B on the substrate, and the geometric center of the orthographic projection shape of the bottom end of the third protruding structure 13C on the substrate are all located on or substantially located on the same straight line extending in the set direction. As shown in FIG. 10, the distance between the bottom end of the first protruding structure 13A and the bottom end of the second protruding structure 13B in the set direction can be set as a first interval W3, and the distance between the bottom end of the second protruding structure 13B and the bottom end of the third protruding structure 13C in the set direction can be set as a second interval W4, wherein the first interval W3 is less than the second interval W4. By adjusting the interval between the bottom ends of the adjacent protruding structures, the area of the light emitting area located between the bottom ends of the adjacent protruding structures can be adjusted, thereby adjusting the light emitting brightness of the light emitting area located between the bottom ends of the adjacent protruding structures, so as to achieve the effect of making the light emitting brightness of the display substrate at each viewing angle more uniform. In specific implementation, the adjustment can be made according to the specific structure of the display substrate, which is not limited herein.

[0112] In some embodiments, as shown in FIG. 10, for the plurality of protruding structures arranged in the same pixel opening K1, the shape of at least part of the protruding structures is a trapezoidal shape, and the trapezoidal protruding structure further comprises a top surface 132 parallel to the substrate 10. The top surface is located at one end of the side surface 131 away from the substrate 100, i.e. the top surface 132 is located at the top end of the protruding structure, and the top surface 132 is connected to the side surface 131. In combination with FIG. 10 and FIG. 3, the first electrode 111 further covers the top surface 132 of the protruding structure 13. In specific implementation, the width of the top surface 132 of at least part of the protruding structures arranged in the same pixel opening K1 in a set direction can be different. For example, as shown in FIG. 10, the plurality of protruding structures arranged in the same pixel opening K1 include a first protruding structure 13A and a fourth protruding structure 13D, both of which are trapezoidal protruding structures, the top surface of the first protruding structure 13A has a first width W5 in a set direction, the top surface of the fourth protruding structure 13D has a second width W6 in the set direction, and the first width W5 is greater than the second width W6. The set direction can be any direction, and when comparing the first width W5 and the second width W6, the width of the top surface of the first protruding structure 13A and the width of the top surface of the fourth protruding structure 13D are measured along the same set direction, and when measuring the width of the top surface of the first protruding structure 13A, the measurement is made along the set direction and through the geometric center of the top surface of the first protruding structure 13A, and when measuring the width of the top surface of the fourth protruding structure 13D, the measurement is made along the set direction and through the geometric center of the top surface of the fourth protruding structure 13D. By adjusting the width of the top surface of the protruding structure, the area of the light emitting region corresponding to the top surface of the protruding structure can be adjusted, so as to adjust the light emitting brightness of the light emitting region corresponding to the top surface of the protruding structure, so as to achieve the effect of making the light emitting brightness of the display substrate more uniform at various viewing angles. In specific implementation, the adjustment can be made according to the specific structure of the display substrate, which is not limited herein.

[0113] In specific implementation, the shape of the trapezoidal protruding structure arranged in the same pixel opening K1 can be at least one of a circular truncated cone or a prismatic truncated cone, and the prismatic truncated cone can be a three-prismatic truncated cone, a four-prismatic truncated cone, a five-prismatic truncated cone, etc., which is not limited herein. For example, the shape of the trapezoidal protruding structure arranged in the same pixel opening K1 can be all circular truncated cones, or all prismatic truncated cones, or part of circular truncated cones and the rest part of prismatic truncated cones, which is not limited herein. In some embodiments, the shape of the trapezoidal protruding structure can further comprise other trapezoidal structures, which is not limited herein.

[0114] In summary, when the shape of the protruding structure is trapezoidal, the inner side angle formed by the side surface of the protruding structure and the substrate, the height of the protruding structure, the width of the top surface of the protruding structure, and the spacing between the bottom ends of adjacent protruding structures can be adjusted to adjust the luminous brightness of the pixel unit at different viewing angles, and finally the problems of luminance decay and color deviation of the display substrate at different viewing angles are improved.

[0115] FIG. 11 is a schematic view of a cross-sectional structure of a display substrate according to an embodiment of the present disclosure.

[0116] In some embodiments, for the plurality of protruding structures arranged in the same pixel opening K1, the shape of at least part of the protruding structures is conical. As shown in FIG. 11, the end of the side surface 131 away from the substrate 10 is the top end 1312 of the protruding structure, and the side surface 131 of the conical protruding structure converges at the top end 1312 to a point, thereby forming a conical shape.

[0117] In specific implementation, the shape of the conical protruding structure arranged in the same pixel opening K1 can be at least one of a circular cone or a pyramid, and the pyramid can be a triangular pyramid, a quadrangular pyramid, a pentagonal pyramid, etc., which are not limited herein. For example, the shape of the conical protruding structure arranged in the same pixel opening K1 can be all circular cones, or all pyramids, or part of circular cones and the rest part of pyramids, which are not limited herein. In some embodiments, the shape of the conical protruding structure can also include other conical structures, which are not limited herein. When the shape of the protruding structure is conical, the inner side angle formed by the side surface of the protruding structure and the substrate, the height of the protruding structure, and the spacing between the bottom ends of adjacent protruding structures can be adjusted to adjust the luminous brightness of the pixel unit at different viewing angles, and finally the problems of luminance decay and color deviation of the display substrate at different viewing angles are improved.

[0118] In some embodiments, as shown in FIG. 10, the plurality of protruding structures arranged in the same pixel opening K1 can all be arranged as trapezoidal structures. In some embodiments, as shown in FIG. 11, the plurality of protruding structures arranged in the same pixel opening K1 can all be arranged as conical structures. In some embodiments, the plurality of protruding structures arranged in the same pixel opening K1 can be partially arranged as trapezoidal structures and the rest part arranged as conical structures, which are not limited herein.

[0119] FIG. 12 is a schematic view of a cross-sectional structure of a display substrate according to an embodiment of the present disclosure.

[0120] In some embodiments, as shown in FIG. 12, the display substrate further includes a pixel defining layer 12. The pixel defining layer 12 is located on one side of the substrate 10. The first electrode 111 is located between the pixel defining layer 12 and the substrate 10. In a specific implementation, the first electrode 111 can be fabricated on one side of the substrate 10, and then the pixel defining layer 12 can be fabricated on the side of the first electrode 111 away from the substrate 10.

[0121] As shown in FIG. 12, the pixel defining layer 12 includes a plurality of pixel regions P, and adjacent pixel regions P are separated by the pixel defining layer 12. One pixel region P corresponds to one pixel unit 11, that is, the first electrode 111, the light-emitting functional layer 112 and the second electrode 113 in the same pixel region P constitute the pixel unit 11 corresponding to the pixel region P. A plurality of openings K are formed in one pixel region P, and adjacent openings K are separated by the pixel defining layer. Each opening K exposes the first electrode 111 of the pixel unit 11 corresponding to the pixel region P. One opening K corresponds to one light-emitting region of the pixel unit 11, and the light-emitting functional layer 112 and the second electrode 113 in each light-emitting region are arranged in the corresponding opening K. In a specific implementation, the light-emitting functional layer 112 can be filled in the opening K by inkjet printing or the like. By controlling the thickness of the light-emitting functional layer 112 in each opening K and / or the thickness of the transparent metal oxide layer in the first electrode 111, the cavity length of the optical microcavity formed in each opening K can be controlled, thereby realizing multiple light-emitting regions of the same pixel unit 11, and the cavity length of the optical microcavity has multiple different values.

[0122] In some embodiments, for the same pixel region P, the thickness of the light-emitting functional layer 112 in the plurality of openings K has multiple different values. For example, as shown in FIG. 12, the plurality of openings K correspond to the first light-emitting region S1, the second light-emitting region S2 and the third light-emitting region S3 of the pixel unit, respectively. In a specific implementation, the thickness of the light-emitting functional layer 112 in the first light-emitting region S1 and the thickness of the light-emitting functional layer 112 in the third light-emitting region S3 can be set to be greater than the thickness of the light-emitting functional layer 112 in the second light-emitting region S2, thereby adjusting the cavity length of the optical microcavity in each light-emitting region by adjusting the thickness of the light-emitting functional layer 112.

[0123] FIG. 13 is a tenth schematic view of a cross-sectional structure of a display substrate provided by an embodiment of the present disclosure.

[0124] In some embodiments, as shown in FIG. 13, the first electrode includes a reflective conductive layer 111A and a transparent conductive layer 111B, the transparent conductive layer 111B is located between the reflective conductive layer 111A and the light-emitting functional layer 112, and the transparent conductive layer 111B can be in direct contact with the light-emitting functional layer 112, the thickness of the transparent conductive layer 111B together with the thickness of the light-emitting functional layer 112 determines the cavity length of the optical microcavity. In specific implementation, the thickness of the transparent conductive layer 111B exposed by the openings K corresponding to the first light-emitting region S1 and the third light-emitting region S3 can be set to be greater than the thickness of the transparent conductive layer 111B exposed by the openings K corresponding to the second light-emitting region S2, so as to adjust the cavity length of the optical microcavity in each light-emitting region by adjusting the thickness of the light-emitting functional layer 112.

[0125] In specific implementation, the thickness of the light-emitting functional layer 112 or the thickness of the transparent conductive layer 111B can be adjusted alone, or the thickness of the light-emitting functional layer 112 and the thickness of the transparent conductive layer 111B can be adjusted simultaneously, so as to adjust the cavity length of the optical microcavity formed in different openings, which is not limited herein.

[0126] In specific implementation, the display substrate provided by the embodiments of the present disclosure can further include other structures not mentioned in the foregoing embodiments but necessary for achieving specific functions, which are not described herein. The specific structure of the display substrate provided by the embodiments of the present disclosure can also be adjusted according to actual conditions without departing from the intention of the present disclosure, which is not limited herein.

[0127] The second aspect of the present disclosure also provides a display device. The display device provided by the embodiments of the present disclosure includes the display substrate provided by any of the foregoing embodiments. In specific implementation, the display device provided by the embodiments of the present disclosure has the same or similar technical effects as any of the foregoing embodiments, which are not described herein. The display device provided by the embodiments of the present disclosure can specifically be a mobile phone, a tablet computer, a notebook computer, a display, a monitor, etc., which is not limited herein.

[0128] Although the preferred embodiments of the present disclosure have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted as including all changes and modifications of the preferred embodiments and falling within the scope of the present disclosure.

[0129] Obviously, those skilled in the art can make various modifications and variations to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalent technologies, the present disclosure also intends to include these modifications and variations.

Claims

1. A display substrate, wherein, The display substrate comprises: a substrate; a pixel unit located on one side of the substrate; at least one of the pixel units comprises: a first electrode located on one side of the substrate; a light-emitting functional layer located on the side of the first electrode away from the substrate; a second electrode located on the side of the light-emitting functional layer away from the first electrode; the first electrode, the light-emitting functional layer and the second electrode form an optical microcavity; one of the pixel units comprises a plurality of light-emitting regions, and the cavity length of the optical microcavity has a plurality of different values for the plurality of light-emitting regions of the same pixel unit. 2.The display substrate of claim 1, wherein, The display substrate further comprises: a pixel definition layer located on one side of the substrate; the pixel definition layer is provided with a pixel opening; the pixel unit is located in the pixel opening; a protruding structure located in the pixel opening; the protruding structure comprises a side surface inclined with respect to the substrate, one end of the side surface close to the substrate is the bottom end of the protruding structure, and the included angle between the side surface and the inner side of the substrate is an acute angle; the first electrode, the light-emitting functional layer and the second electrode all cover the side surface of the protruding structure and the area between the bottom ends of adjacent protruding structures. 3.The display substrate of claim 1, wherein, The thickness of the first electrode, the light-emitting functional layer and the second electrode corresponding to the area between the bottom ends of adjacent protruding structures is greater than the thickness of the first electrode, the light-emitting functional layer and the second electrode corresponding to the side surface. 4.The display substrate of claim 2 or 3, wherein, The thickness of the light-emitting functional layer corresponding to the area between the bottom ends of adjacent protruding structures and the thickness of the light-emitting functional layer corresponding to the side surface satisfy: T2=T1×cosα; wherein T1 represents the thickness of the light-emitting functional layer corresponding to the area between the bottom ends of adjacent protruding structures, T2 represents the thickness of the light-emitting functional layer corresponding to the side surface, and α represents the included angle between the side surface and the inner side of the substrate.

5. The display substrate according to any one of claims 2 to 4, wherein A plurality of protruding structures are arranged in the same pixel opening; the protruding structures in the same pixel opening are the same in three-dimensional shape and size; the distance between the bottom ends of any two adjacent protruding structures arranged in any direction in the same pixel opening is the same.

6. The display substrate of any one of claims 2-4, wherein, A plurality of protruding structures are arranged in the same pixel opening; the included angle between the side surface of the protruding structure and the inner side of the substrate in the same pixel opening has a plurality of different values. 7.The display substrate of claim 6, wherein, For at least one of the protruding structures arranged in the same pixel opening, the included angle between the side surface of the protruding structure and the inner side of the substrate has a plurality of different values corresponding to a plurality of positions around the protruding structure. 8.The display substrate of claim 6 or 7, wherein, For a plurality of protruding structures arranged in the same pixel opening, the value of the included angle between the side surface of any protruding structure and the inner side of the substrate at a set position is different from the value of the included angle between the side surface of another protruding structure and the inner side of the substrate at a corresponding position.

9. The display substrate of any of claims 6-8, wherein, For a plurality of protruding structures arranged in the same pixel opening, the heights of at least two of the protruding structures are different.

10. The display substrate of any one of claims 6-8, wherein, For the plurality of protruding structures arranged in the same pixel opening, the distance between the bottom ends of at least some adjacent protruding structures arranged in a certain direction is different.

11. The display substrate of any one of claims 6-10, wherein, For the plurality of protruding structures arranged in the same pixel opening, at least some of the protruding structures are in a conical shape. The end of the side surface away from the substrate is the top end of the protruding structure, and the side surface converges at a point at the top end.

12. The display substrate of any one of claims 6-10, wherein, For the plurality of protruding structures arranged in the same pixel opening, at least some of the protruding structures are in a trapezoidal shape; the trapezoidal protruding structure further comprises a top surface parallel to the substrate; the top surface is located at the end of the side surface away from the substrate and is connected with the side surface. The first electrode further covers the top surface of the protruding structure; the width of the top surface of at least some protruding structures in a certain direction is different.

13. The display substrate of any of claims 2-12, wherein, The first electrode further covers part of the side wall of the pixel defining layer.

14. The display substrate of any one of claims 2-12, wherein, The first electrode and the side wall of the pixel defining layer are not in contact with each other.

15. The display substrate of any one of claims 2-14, wherein, The protruding structure and the pixel defining layer are in the same layer.

16. The display substrate of any one of claims 2-15, wherein, For any protruding structure, the inner side angle formed by the side surface and the substrate is between 20° and 80°. 17.The display substrate of claim 1, wherein, The display substrate further comprises: A pixel defining layer located on one side of the substrate; the first electrode is located between the pixel defining layer and the substrate; The pixel defining layer comprises a plurality of pixel regions, one pixel region corresponds to one pixel unit, and a plurality of openings are arranged in one pixel region; the openings expose the corresponding first electrode; one opening corresponds to one light emitting region of the pixel unit, and the light emitting functional layer and the second electrode in each light emitting region are arranged in the corresponding opening.

18. The display substrate of claim 17, wherein, For the same pixel region, the thickness of the light emitting functional layer in the plurality of openings has a plurality of different values.

19. The display substrate of claim 17, wherein, The first electrode comprises a reflective conductive layer and a transparent conductive layer, and the transparent conductive layer is located between the reflective conductive layer and the light emitting functional layer; for the same pixel region, the thickness of the transparent conductive layer exposed by the plurality of openings has a plurality of different values.

20. A display device comprising: The display substrate comprises the display substrate according to any one of claims 1-19. The display substrate comprises the display substrate according to any one of claims 1-19.

Images