CN117769306A - Display panel and display device - Google Patents

Abstract

The disclosure relates to a display panel and a display device, and relates to the technical field of display. The display panel comprises a driving backboard, a first electrode, a pixel definition layer, a second electrode and a light extraction structure; the first electrodes are arranged on one side surface of the driving backboard at intervals; the pixel definition layer and the first electrodes are arranged on the same side face of the driving backboard and are provided with pixel openings exposing the first electrodes; the light-emitting layer is at least partially positioned in the pixel opening and is stacked on the surface of the first electrode far away from the driving backboard; the second electrode is at least partially positioned in the pixel opening and is stacked on the surface of the light-emitting layer far away from the driving backboard; the second electrode extends to one side of the pixel definition layer away from the drive backboard; the light extraction structure is arranged between the driving backboard and the second electrode, and the orthographic projection of the light extraction structure on the driving backboard is positioned in the orthographic projection of the pixel definition layer on the driving backboard; the light extraction structure is used for enabling at least part of light rays entering the pixel definition layer, which are emitted by the light emitting layer, to exit through the second electrode.

Description

Display panel and display device

Technical Field

The disclosure relates to the technical field of display, in particular to a display panel and a display device.

Background

The OLED (organic light emitting diode) display panel has the advantages of self-luminescence, wide color gamut, high contrast, flexibility, high response, flexibility and the like, and has wide application prospect. However, in the existing display panel using OLED as a light emitting device, there is a large light loss, and the light emitting efficiency still needs to be improved.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The present disclosure provides a display panel and a display device, which can improve light extraction efficiency.

According to an aspect of the present disclosure, there is provided a display panel including:

a drive back plate;

the first electrodes are arranged on one side surface of the driving backboard at intervals;

the pixel definition layer is arranged on the same side face of the driving backboard with the first electrodes and is provided with pixel openings exposing the first electrodes;

a light-emitting layer at least partially located in the pixel opening and stacked on the surface of the first electrode far away from the driving backboard;

the second electrode is at least partially positioned in the pixel opening and is stacked on the surface of the light-emitting layer, which is far away from the driving backboard; the second electrode extends to one side of the pixel definition layer away from the driving backboard;

the light extraction structure is arranged between the driving backboard and the second electrode, and the orthographic projection of the light extraction structure on the driving backboard is positioned in the orthographic projection of the pixel definition layer on the driving backboard; the light extraction structure is used for enabling at least part of light rays entering the pixel definition layer, which are emitted by the light emitting layer, to be emitted through the second electrode.

In an exemplary embodiment of the disclosure, the light extraction structure includes a plurality of light-transmitting microstructures protruding toward the driving back plate, and a plurality of the microstructures are disposed around the outside of one of the pixel openings; the microstructure is at least partially embedded in a surface of the pixel defining layer away from the drive backplate; the refractive index of the microstructure is greater than the refractive index of the pixel defining layer.

In an exemplary embodiment of the disclosure, the microstructure is a sphere-segment structure surrounded by a sphere cap and a bottom surface, the sphere cap being at least partially embedded in a surface of the pixel defining layer remote from the driving backplate.

In one exemplary embodiment of the present disclosure, the bottom surface of the microstructure is flush with a surface of the pixel defining layer remote from the driving backplate, and the height of the microstructure is not more than half the thickness of the pixel defining layer.

In one exemplary embodiment of the present disclosure, each of the microstructures is divided into a plurality of light extracting units, one of the light extracting units includes a plurality of microstructure groups, one of the microstructure groups includes a plurality of the microstructures surrounding the same pixel opening; each microstructure group of the same light extraction unit is arranged around the same pixel opening and distributed along a direction away from the pixel opening.

In one exemplary embodiment of the present disclosure, the first electrode has a central portion exposed by the pixel opening and an edge portion located outside the central portion, the pixel defining layer covering the edge portion;

the light extraction structure is arranged on the surface of the edge part far away from the driving backboard, and comprises a plurality of microstructures protruding along the direction far away from the driving backboard.

In an exemplary embodiment of the disclosure, the microstructure is a segment structure surrounded by a spherical cap and a bottom surface, and the bottom surface is located on a surface of the edge portion away from the driving back plate.

In an exemplary embodiment of the present disclosure, the height of the microstructures is not more than half the thickness of the pixel defining layer.

In one exemplary embodiment of the present disclosure, each of the microstructures is divided into a plurality of light extracting units, one of the light extracting units includes a plurality of microstructure groups, one of the microstructure groups includes a plurality of the microstructures surrounding the same center portion; each microstructure group of the same light extraction unit is arranged around the same central part and distributed along the direction away from the central part.

In an exemplary embodiment of the present disclosure, the light extraction structure is disposed in the same layer as the first electrode and is configured to reflect light toward the second electrode.

In one exemplary embodiment of the present disclosure, the light extraction structure includes a plurality of light extraction units, one of which is disposed around one of the first electrodes.

In an exemplary embodiment of the present disclosure, the light extraction unit is provided with a light transmission hole.

In one exemplary embodiment of the present disclosure, the light transmitting hole is divided into a plurality of light transmitting units, one of the light transmitting units includes a plurality of light transmitting hole groups, one of the light transmitting hole groups includes a plurality of the light transmitting holes surrounding the same first electrode; each light-transmitting hole group of the same light-transmitting unit is arranged around the same first electrode and distributed along the direction far away from the first electrode.

In an exemplary embodiment of the present disclosure, the light-transmitting hole is an annular hole disposed around the first electrode, and a plurality of the light-transmitting holes are disposed around the same periphery of the first electrode.

According to an aspect of the present disclosure, there is provided a display device including the display panel of any one of the above.

According to the display panel and the display device, the light extraction structure covered by the pixel definition layer is arranged between the driving backboard and the second electrode, and at least part of light entering the pixel definition layer and emitted by the light emitting layer can be emitted through the second electrode by utilizing the light extraction structure, so that light can be emitted in an area outside the pixel opening, and the light emitting efficiency of the display panel is improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.

Fig. 1 is a top view of an embodiment of a display panel of the present disclosure.

Fig. 2 is a schematic cross-sectional view of an embodiment of a display panel according to the present disclosure using a first driving structure.

Fig. 3 is a schematic cross-sectional view of an embodiment of a display panel according to the present disclosure using a second driving structure.

Fig. 4 is a schematic cross-sectional view of a display panel according to an embodiment of the present disclosure using a third driving structure.

Fig. 5 is a schematic cross-sectional view of another embodiment of a display panel according to the present disclosure using a third driving structure.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of an icon to another component, these terms are used in this specification for convenience only, such as in terms of the orientation of the examples described in the figures. It will be appreciated that if the device of the icon is flipped upside down, the recited "up" component will become the "down" component. When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

The terms "a," "an," "the," "said" and "at least one" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and do not limit the number of their objects.

By "overlapping" of features a and B herein is meant that the orthographic projection of features a onto a plane and the orthographic projection of features B onto the plane at least partially coincide; the plane may be a surface of the substrate, a surface of the driving back plate for disposing the first electrode, or other planes parallel to the surface.

The embodiment of the disclosure provides a display panel, as shown in fig. 1, which may be divided into a display area AA and a peripheral area WA located outside the display area AA, where the display area AA is an area for displaying images, and the peripheral area WA may be a continuous annular area surrounding the display area AA, and of course, the peripheral area WA may also be a discontinuous area surrounding the display area AA.

As shown in fig. 2 to 5, the display panel may include a driving back plate 1, a plurality of light emitting devices 2, and a pixel defining layer 3, wherein:

the driving back plate 1 has a driving circuit for driving the light emitting device 2 to emit light, and the driving circuit may include a pixel circuit located in the display area AA and a peripheral circuit located in the peripheral area WA, the pixel circuits may be distributed in an array along a row direction and a column direction, and one pixel circuit may be connected to the light emitting device 2. Of course, there may be a part of the pixel circuits located in the peripheral area WA. The pixel circuit may be a 3T1C, 7T1C, or the like, as long as the light emitting device 2 can be driven to emit light, and the structure thereof is not particularly limited herein, and nTmC means that one pixel circuit includes n transistors (denoted by the letter "T") and m capacitors (denoted by the letter "C"). The number of pixel circuits may be the same as the number of light emitting devices 2, and connected to each light emitting device 2 in one-to-one correspondence. Of course, the same pixel circuit may be connected to a plurality of light emitting devices 2, and is not particularly limited herein.

The peripheral circuit may be connected to the light emitting device 2 through a pixel circuit, to which a first power signal is applied to the light emitting device 2, and on the other hand, may also be connected to the light emitting device 2, and to the second electrode 23, to which a second power signal is applied, and the current through the light emitting device 2 may be controlled through the pixel circuit, thereby controlling the brightness of the light emitting device 2. Wherein the peripheral circuit may include at least one gate driving circuit, a light emission control circuit, and the like.

As shown in fig. 2-5, in some embodiments of the present disclosure, the driving backplate 1 may include a substrate 11 and a circuit layer 12 disposed on one side of the substrate 11, and the driving circuit may be disposed in the circuit layer 12, wherein:

the substrate 11 may be a flat plate structure, and may be made of a hard material such as glass, or may be made of a flexible material such as polyimide, and is not particularly limited. The circuit layer 12 may include a semiconductor layer, a first gate insulating layer, a first gate layer, a second gate insulating layer, a second gate layer, an interlayer dielectric layer, a first source drain layer, a first planarization layer, a second source drain layer, and a second planarization layer, which are sequentially disposed in a direction away from the substrate 11. The semiconductor layer can be made of polysilicon or metal oxide such as IGZO, the active parts of the transistors of the driving circuit can be located in the semiconductor layer, the first grid layer can be used for forming a grid electrode of the transistor and one polar plate of the capacitor, the second grid layer can be used for forming the other polar plate of the capacitor, and the first source drain layer and the second source drain layer can be used for forming at least part of wiring of the driving circuit.

The light emitting devices 2 may be arrayed within the display area AA, which may be OLEDs (organic light emitting diodes) using organic light emitting materials; LEDs (light emitting diodes) using inorganic luminescent materials, such as Micro LEDs (Micro light emitting diodes) and Mini LEDs (sub-millimeter light emitting diodes), are also possible; a device having a light emitting function such as a QLED (quantum dot diode) may be used, and the specific structure of the light emitting device 2 is not particularly limited, so long as the device can emit light independently, and an image may be displayed.

As shown in fig. 2 to 5, taking an OLED as an example of the light emitting device 2, it may include a first electrode 21, a light emitting layer 22, and a second electrode 23 sequentially stacked in a direction away from the driving backplate 1, and by applying an electrical signal to the first electrode 21 and the second electrode 23, the light emitting layer 22 may be excited to emit light, and the specific light emitting principle will not be described in detail herein.

The pixel defining layer 3 and the first electrode 21 may be provided on the same side of the driving backplate 1, e.g. the surface of the second planar layer facing away from the substrate 11. The pixel defining layer 3 has a pixel opening 30 exposing each first electrode 21, and the light emitting layer 22 and the second electrode 23 may be stacked with the first electrode 21 in the pixel opening 30 to form the light emitting device 2, that is, the first electrode 21, the light emitting layer 22 and the second electrode 23 in the pixel opening 30 may form one light emitting device 2, and the range of the light emitting device 2 is the range of the pixel opening 30.

The second electrode 23 may be a continuous, integral layer structure which may extend to a side of the pixel defining layer 3 remote from the driving backplate 1 such that at least in the display area AA, the orthographic projection of the pixel defining layer 3 onto the driving backplate 1 coincides with the orthographic projection of the second electrode 23 onto the driving backplate 1. The light emitting devices 2 may share the same second electrode 23.

In some embodiments of the present disclosure, the light emitting layers 22 of the respective light emitting devices 2 may be disposed at intervals, i.e., the light emitting layers 22 within adjacent two of the pixel openings 30 are disconnected, and the thickness of the light emitting layers 22 is smaller than the depth of the pixel openings 30, such that the second electrode 23 is recessed at the pixel openings 30. The light emitting layers 22 of different light emitting devices 2 may comprise different materials, so that different light emitting devices 2 may directly emit light of different colors. Meanwhile, the second electrode 23 may extend to a surface of the pixel defining layer 3 away from the driving backplate 1, thereby covering the light emitting layer 22 and the pixel defining layer 3.

In some embodiments of the present disclosure, the light emitting layer 22 of each light emitting device 2 may be a continuous overall layer structure so as to cover the pixel defining layer 3 and be recessed at the pixel opening 30. The second electrode 23 is also a continuous whole layer structure and covers the light emitting layer 22. Each light emitting device 2 may share the same light emitting layer 22 and the same second electrode 23. At this time, the light emitting colors of the light emitting devices 2 are the same, in order to realize color display, a color film layer may be disposed on a side of the light emitting device 2 away from the driving back plate 1, which may include filter portions corresponding to the light emitting devices 2 one by one, each filter portion may only transmit monochromatic light, and includes filter portions of multiple colors therein, so that color display is realized by matching the color film layer with the light emitting device 2.

In addition, the display panel of the present disclosure may further include an encapsulation layer 5, which may cover each light emitting device 2, for blocking external moisture and oxygen, and preventing the light emitting device from being corroded. In some embodiments of the present disclosure, the encapsulation layer 5 may employ a thin film encapsulation, which may include a first inorganic layer, an organic layer, and a second inorganic layer stacked in order in a direction away from the driving back plate. Of course, the encapsulation layer 5 may also have other structures, which are not particularly limited herein. The color film layer mentioned above may be disposed on a side of the encapsulation layer 5 away from the driving back plate.

The inventor found that, when displaying an image, light with a larger angle of divergence from the light emitting device 2 enters the pixel defining layer 3 from the sidewall of the pixel opening 30 and irradiates the second electrode 23 through the pixel defining layer 3, and at least a portion of the light is totally reflected when irradiating the second electrode 23, and cannot exit from the second electrode 23, which is not beneficial to improving the light extraction efficiency. Based on this finding, the inventors propose that the light extraction efficiency can be improved by extracting the light in the pixel defining layer 3, specifically, by disposing a light extraction structure between the driving back plate 1 and the second electrode 23, and making the orthographic projection of the light extraction structure on the driving back plate 1 be located within the orthographic projection of the pixel defining layer 3 on the driving back plate 1, at least part of the light entering the pixel defining layer 3 from the light emitting layer 22 can be emitted through the second electrode 23, that is, the light extraction amount in the region outside the pixel opening 30 is increased, so that the light extraction efficiency is improved.

The light extraction structure can reduce the incidence angle of at least part of light rays at the second electrode 23 in a refraction mode, scatter the light rays, reduce the incidence angle of part of light rays at the second electrode 23, enable the incidence angle to be smaller than the total reflection angle, and avoid total reflection; part of the light rays propagating towards the driving backboard 1 can be reflected to the second electrode 23 through the light extraction structure, so that the light rays emitted from the second electrode 23 can be increased; the following is an exemplary illustration:

first light extraction structure

As shown in fig. 2, the light extraction structure may include a plurality of light-transmitting microstructures 4 protruding toward the driving back plate 1, and a plurality of microstructures 4 may be disposed around one pixel opening 30. The microstructures 4 are at least partially embedded in the surface of the pixel defining layer 3 remote from the driving backplate 1, thereby forming an interface where the microstructures 4 are in contact with the pixel defining layer 3. In order to accommodate the microstructures 4, grooves matching the shape of the microstructures 4 may be formed on the surface of the pixel defining layer 3 away from the driving back plate 1, the microstructures 4 may be made of resin or other materials and formed in the grooves, or the microstructures 4 may be manufactured independently and then placed in the grooves.

Meanwhile, the refractive index of the microstructure 4 is larger than that of the pixel defining layer 3, at least part of light rays from the interface between the pixel defining layer 3 and the microstructure 4 can be converged, namely gathered, through the microstructure 4, so that the incidence angle theta at the second electrode 23 is reduced, more light rays are enabled to be smaller than the total reflection angle, total reflection is avoided, light rays which cannot be emitted originally are emitted from the position of the pixel defining layer 3 except the pixel opening 30, and the light emitting efficiency is improved.

In some embodiments of the first light extraction structure, as shown in fig. 2, the microstructure 4 may be a segment structure, which is surrounded by a spherical cap and a bottom surface, and the spherical cap is at least partially embedded in the surface of the pixel defining layer 3 away from the driving back plate 1.

Furthermore, the bottom surface of the micro-structure 4 and the surface of the pixel defining layer 3 far away from the driving back plate 1 can be flush, i.e. the height of the micro-structure 4 is the same as the depth of the groove, so that the surface of the pixel defining layer 3 far away from the driving back plate 1 is prevented from being rugged due to the micro-structure 4, which is beneficial to the shape of the light emitting layer 22 or the second electrode 23. The height of the microstructure 4 is the distance between the two points farthest from the microstructure 4 in the direction perpendicular to the driving back plate 1, and for the microstructure 4 of the spherical segment structure, the height is the distance between the center of the bottom surface and the vertex of the spherical cap. At the same time, the height of the microstructure 4 is not more than half the thickness of the pixel defining layer 3, so that the intensity of the pixel defining layer 3 is prevented from being reduced due to the overlarge microstructure 4.

In some embodiments of the first light extraction structure, each microstructure 4 may be divided into a plurality of light extraction units, and one light extraction unit may include a plurality of groups of microstructures 4, for example, 2, 3, 4, 5, etc., which are not particularly limited herein. The same group of microstructures 4 may comprise a plurality of microstructures 4 distributed around the same pixel opening 30. Meanwhile, the groups of microstructures 4 of the same light extracting unit may be disposed around the same pixel opening 30 and distributed in a direction away from the pixel opening 30. That is, for any one pixel opening 30, the microstructures 4 therearound may be distributed along a plurality of concentric circular tracks.

Further, adjacent microstructures 4 may be disposed at intervals in a direction away from the pixel opening 30 and in a direction surrounding the pixel opening 30, or may be in contact with or in a unitary structure.

For two adjacent pixel openings 30, both may share part of the microstructure 4 of the light extraction unit, i.e. the same microstructure 4 may simultaneously participate around two adjacent pixel openings 30.

Second kind of light-taking structure

As shown in fig. 3, the boundary of the bottom of the pixel opening 30 exposing the first electrode 21 may be smaller than the boundary of the first electrode exposed thereto, so that the pixel defining layer 3 may cover the edge of the first electrode 21, specifically, the first electrode 21 may have a central portion 211 exposed by the pixel opening 30 and an edge portion 212 located outside the central portion 211, and the pixel defining layer 3 covers the edge portion 212312. Meanwhile, the outline of the edge portion 212 may be polygonal, circular, etc., and the width of the edge portion 212 in the direction away from the center portion 211 is not greater than the maximum width of the center portion 211 (the distance between two points farthest therefrom) in order to ensure that most of the area of the first electrode 21 can participate in the light emission of the light emitting layer 22.

The light extraction structure can be arranged on the surface of the edge portion 212 away from the driving backboard 1, and the light extraction structure can comprise a plurality of microstructures 4 protruding along the direction away from the driving backboard 1, so that the edge portion 212 is rugged, light rays can be reflected at various reflection angles along the direction away from the driving backboard 1 through the microstructures 4, namely, scattering is realized, the incident angle theta of at least part of the light rays at the second electrode 23 is smaller than the total reflection angle, total reflection is reduced, and the light extraction efficiency is improved. The light extraction structure may be integrally formed with the first electrode 21, or may be made of other materials, as long as the above-described scattering effect can be achieved.

In some embodiments of the second light extraction structure, as shown in fig. 3, the microstructure 4 may be a segment structure, which is surrounded by a spherical cap and a bottom surface, and the bottom surface is located on a surface of the edge 212 away from the driving backplate 1. Meanwhile, in order to ensure that the microstructures 4 are covered by the pixel defining layer 3, the height of the microstructures 4 is not more than half the thickness of the pixel defining layer 3.

In some embodiments of the second light extraction structure, each microstructure 4 may be divided into a plurality of light extraction units, and one light extraction unit may include a plurality of groups of microstructures 4, for example, 2, 3, 4, 5, etc., which are not particularly limited herein. The same group of microstructures 4 may comprise a plurality of microstructures 4 distributed around the same central portion 211. Meanwhile, the groups of the microstructures 4 of the same light extracting unit may be disposed around the same central portion 211 and distributed in a direction away from the central portion 211. That is, for any one of the central portions 211, the microstructures 4 therearound may be distributed along a plurality of concentric circular tracks.

Further, adjacent microstructures 4 may be arranged at intervals in a direction away from the center portion 211 and in a direction around the center portion 211, or may be in contact with or in a unitary structure.

Third kind of light-taking structure

As shown in fig. 4, the light extraction structure and the first electrode may be disposed in the same layer, that is, the light extraction structure and the first electrode belong to different regions of the same film layer, and may be formed simultaneously by the same process, or of course, may be formed separately by the same material or by different materials, so long as they can reflect light. The light extraction structure can be used for reflecting light to the second electrode, so that the light irradiated to the second electrode 23 is increased, and the light extraction efficiency is improved. Meanwhile, the light extraction structure and the first electrode 21 can be arranged at intervals, and the light extraction structure is in floating connection, namely, an electric signal can not be connected, the resistance of the first electrode 21 is prevented from being increased, and only the light reflection effect is achieved.

The light extraction structure may include a plurality of light extraction units, one light extraction unit may be disposed around a first electrode, and the outline of the light extraction unit may be polygonal, circular, etc., so long as the light extraction unit can surround the first electrode. Each light extraction unit may reflect at least part of the light irradiated thereto from the pixel defining layer 3, thereby increasing the light irradiated onto the second electrode 23.

The light extraction structure may be a ring structure continuous along the circumferential direction, or may be provided with light holes 40, which has a reflection effect and is beneficial to improving the transmittance of the display panel.

As shown in fig. 5, in some embodiments of the third light extraction structure, the light transmission holes 40 may be divided into a plurality of light transmission units, one light transmission unit may include a plurality of light transmission hole groups, and one light transmission control group may include a plurality of light transmission holes 40 distributed around the first electrode 21. Meanwhile, the light-transmitting hole groups of the same light-transmitting unit are disposed around the same first electrode 21 and distributed in a direction away from the first electrode 21, that is, for any one of the first electrodes 21, the surrounding light-transmitting holes 40 may be distributed along a plurality of concentric circular tracks.

In some embodiments of the third light extraction structure, the light holes 40 may be annular holes disposed around the first electrode 21, and a plurality of light holes 40 may be disposed around the same first electrode 21.

In addition, in other embodiments of the third light extraction structure, the light extraction structure may also adopt a plurality of microstructures that are in the same layer as the first electrode 21, and the microstructures may be a sphere-like structure or other structures, so long as they can reflect light, and the microstructures may be distributed around the first electrode 21. Meanwhile, the microstructures surrounding the same first electrode 21 may be distributed at intervals, and light reflection may be achieved within the range covered by the pixel defining layer 3 while ensuring a certain transmittance.

The embodiments of the present disclosure further provide a display device, which may include a display panel, where the display panel may be any of the foregoing embodiments, and the specific structure and beneficial effects thereof are not described herein. The display device may be a mobile phone, a television, a tablet computer, or may be a wearable device such as a VR (Virtual Reality) device, a smart watch, etc., which are not listed here.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims (15)

1. A display panel, comprising:

a drive back plate;

the first electrodes are arranged on one side surface of the driving backboard at intervals;

the pixel definition layer is arranged on the same side face of the driving backboard with the first electrodes and is provided with pixel openings exposing the first electrodes;

a light-emitting layer at least partially located in the pixel opening and stacked on the surface of the first electrode far away from the driving backboard;

the second electrode is at least partially positioned in the pixel opening and is stacked on the surface of the light-emitting layer, which is far away from the driving backboard; the second electrode extends to one side of the pixel definition layer away from the driving backboard;

the light extraction structure is arranged between the driving backboard and the second electrode, and the orthographic projection of the light extraction structure on the driving backboard is positioned in the orthographic projection of the pixel definition layer on the driving backboard; the light extraction structure is used for enabling at least part of light rays entering the pixel definition layer, which are emitted by the light emitting layer, to be emitted through the second electrode.

2. The display panel according to claim 1, wherein the light extraction structure comprises a plurality of light-transmitting microstructures protruding toward the driving back plate, and a plurality of the microstructures are disposed around the outside of one of the pixel openings; the microstructure is at least partially embedded in a surface of the pixel defining layer away from the drive backplate; the refractive index of the microstructure is greater than the refractive index of the pixel defining layer.

3. The display panel of claim 2, wherein the microstructures are a sphere-segment structure surrounded by a sphere cap and a bottom surface, the sphere cap being at least partially embedded in a surface of the pixel defining layer remote from the driving backplate.

4. A display panel according to claim 3, wherein the bottom surface of the microstructure is flush with the surface of the pixel defining layer remote from the drive backplate, and the height of the microstructure is no more than half the thickness of the pixel defining layer.

5. The display panel of claim 2, wherein each of the microstructures is divided into a plurality of light extraction units, one of the light extraction units comprising a plurality of microstructure groups, one of the microstructure groups comprising a plurality of the microstructures surrounding the same pixel opening; each microstructure group of the same light extraction unit is arranged around the same pixel opening and distributed along a direction away from the pixel opening.

6. The display panel according to claim 1, wherein the first electrode has a center portion exposed by the pixel opening and an edge portion located outside the center portion, the pixel defining layer covering the edge portion;

the light extraction structure is arranged on the surface of the edge part far away from the driving backboard, and comprises a plurality of microstructures protruding along the direction far away from the driving backboard.

7. The display panel of claim 6, wherein the microstructure is a sphere-segment structure surrounded by a sphere crown and a bottom surface, and the bottom surface is located on a surface of the edge portion away from the driving back plate.

8. The display panel of claim 7, wherein the height of the microstructures is no greater than half the thickness of the pixel defining layer.

9. The display panel of claim 6, wherein each of the microstructures is divided into a plurality of light extracting units, one of the light extracting units comprising a plurality of microstructure groups, one of the microstructure groups comprising a plurality of the microstructures surrounding the same center portion; each microstructure group of the same light extraction unit is arranged around the same central part and distributed along the direction away from the central part.

10. The display panel of claim 1, wherein the light extraction structure is disposed on the same layer as the first electrode and is configured to reflect light toward the second electrode.

11. The display panel of claim 10, wherein the light extraction structure comprises a plurality of light extraction units, one of the light extraction units being disposed around one of the first electrodes.

12. The display panel according to claim 11, wherein the light extraction unit is provided with light transmission holes.

13. The display panel of claim 12, wherein the light-transmitting holes are divided into a plurality of light-transmitting units, one of the light-transmitting units including a plurality of light-transmitting hole groups, one of the light-transmitting hole groups including a plurality of the light-transmitting holes surrounding the same first electrode; each light-transmitting hole group of the same light-transmitting unit is arranged around the same first electrode and distributed along the direction far away from the first electrode.

14. The display panel of claim 12, wherein the light-transmitting holes are annular holes disposed around the first electrode, and a plurality of the light-transmitting holes are disposed around a periphery of the same first electrode.

15. A display device comprising the display panel of any one of claims 1-14.