CN113629207B - Display panel and display device - Google Patents
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- CN113629207B CN113629207B CN202110818518.6A CN202110818518A CN113629207B CN 113629207 B CN113629207 B CN 113629207B CN 202110818518 A CN202110818518 A CN 202110818518A CN 113629207 B CN113629207 B CN 113629207B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/82—Cathodes
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
Abstract
The invention discloses a display panel and a display device. The display panel comprises a conventional display area and a sensing display area adjacent to the conventional display area; the display panel further comprises a pixel definition layer and a cathode layer arranged on the pixel definition layer, wherein the pixel definition layer comprises a plurality of first pixel openings positioned in the sensing display area; the cathode layer comprises a plurality of cathode electrodes and a conducting layer, each first pixel opening is correspondingly provided with a cathode electrode, and the conducting layer is at least positioned in the sensing display area and electrically connected with each cathode electrode; wherein, the light transmittance of the conducting layer is greater than that of each cathode electrode. The invention can effectively improve the light transmittance of the sensing display area of the display panel and further realize the comprehensive screen display and the under-screen sensing function.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel and a display device having the same.
Background
Organic Light-Emitting Diode (OLED) display is a novel display technology developed in the middle of the 20 th century, and an OLED display device has the advantages of ultra-Light and thin property, all-solid state, active Light emission, high response speed, high contrast, no view angle limitation, wide working temperature range, low power consumption, low cost, strong shock resistance, capability of realizing flexible display and the like, and is an ideal planar display device of the next generation, and the OLED display device has excellent performance and huge market potential, and attracts numerous manufacturers and scientific research institutions all over the world to be put into the production and research and development of OLED display panels.
Along with the development of the comprehensive screen technology, the camera technology under the screen places the camera below the display screen, and meanwhile, the display screen in the camera area can still display, so that the comprehensive screen display technology is truly. However, most of the cathode materials in the OLED display panel are made of alloy materials, and the whole surface of the cathode materials covers the OLED device, so that the light transmittance is low, and further the light transmission and imaging of the camera under the screen are affected.
Disclosure of Invention
The embodiment of the invention provides a display panel and a display device, which can effectively improve the light transmittance of a sensor area of the display panel so as to solve the technical problem that the light transmittance of the conventional OLED display panel is low due to a cathode electrode.
The embodiment of the invention provides a display panel, which comprises a conventional display area and a sensing display area adjacent to the conventional display area;
the display panel further includes:
a pixel defining layer including a plurality of first pixel openings in the sensing display area; and
the cathode layer is arranged on the pixel defining layer and comprises a plurality of cathode electrodes and a conducting layer, each first pixel opening is correspondingly provided with one cathode electrode, and the conducting layer is at least positioned in the sensing display area and electrically connected with each cathode electrode;
the light transmittance of the conducting layer is larger than that of each cathode electrode.
In an embodiment of the invention, an orthogonal projection of each of the cathode electrodes on the pixel definition layer is located within a coverage of an orthogonal projection of the corresponding first pixel opening on the pixel definition layer.
In one embodiment of the present invention, the shape of the orthographic projection of each of the cathode electrodes on the pixel defining layer is independently selected from a circle or a polygon.
In an embodiment of the invention, the plurality of cathode electrodes includes a first cathode electrode and at least a second cathode electrode adjacent to the first cathode electrode, and a shape of an orthographic projection of the first cathode electrode on the pixel definition layer is different from a shape of an orthographic projection of the second cathode electrode on the pixel definition layer.
In an embodiment of the invention, the conducting layer is disposed on the pixel defining layer and covers the plurality of cathode electrodes.
In an embodiment of the invention, the display panel further includes an anode electrode disposed in each of the first pixel openings, a light emitting layer disposed on the anode electrode, and a signal terminal disposed in the non-display region of the display panel, the cathode electrode is disposed on the light emitting layer, and the conducting layer is electrically connected between each of the cathode electrodes and the signal terminal.
In an embodiment of the invention, the display panel further includes a cathode layer disposed on the pixel defining layer and located in the normal display area, the pixel defining layer further includes a plurality of second pixel openings located in the normal display area, and the cathode layer covers the plurality of second pixel openings and is electrically connected between the conducting layer and the signal terminals.
In one embodiment of the present invention, a work function of the cathode electrode is smaller than a work function of the conductive layer.
In one embodiment of the present invention, the material of the cathode electrode includes a magnesium-silver alloy, and the material of the conductive layer includes indium zinc oxide or indium tin oxide.
According to the above object of the present invention, a display device is provided, which includes the display panel and a sensor assembly, wherein the sensor assembly is disposed on one side of the display panel corresponding to the sensing display area.
The invention has the beneficial effects that: according to the invention, the cathode layer is arranged in the sensing display area, the cathode layer comprises a plurality of cathode electrodes and the conducting layer, each first pixel opening is correspondingly provided with one cathode electrode, the conducting layer is used for electrically connecting the cathode electrodes, and the light transmittance of the conducting layer is greater than that of the cathode electrodes, so that the conducting layer with larger light transmittance can be arranged in the sensing display area except the first pixel opening without being influenced by the cathode electrodes with smaller light transmittance, the light transmittance of the sensing display area of the display panel can be effectively improved, and the comprehensive screen display and the under-screen sensing functions are further realized.
Drawings
The technical scheme and other beneficial effects of the invention are obvious from the detailed description of the specific embodiments of the invention in combination with the attached drawings.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic plane distribution structure of a display panel according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 5 is a schematic plane distribution structure of the cathode layer according to the embodiment of the present invention;
fig. 6 is a schematic view of another planar distribution structure of the cathode layer provided in the embodiment of the present invention;
fig. 7 is a schematic view of another planar distribution structure of the cathode layer provided in the embodiment of the present invention;
fig. 8 is a schematic view of another planar distribution structure of the cathode layer according to the embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
Referring to fig. 1 and 2, a display panel includes a conventional display area a and a sensing display area B adjacent to the conventional display area a;
the display panel further includes a pixel defining layer 10 and a cathode layer 20 disposed on the pixel defining layer 10, wherein the pixel defining layer 10 includes a plurality of first pixel openings 11 located in the sensing display region B, the cathode layer 20 includes a plurality of cathode electrodes 21 and a conducting layer 22, each of the first pixel openings 11 is correspondingly provided with a cathode electrode 21, and the conducting layer 22 is at least located in the sensing display region B and electrically connected to each of the cathode electrodes 21.
Further, the light transmittance of the conductive layer 22 is larger than that of each cathode electrode 21.
In the implementation and application process, in the embodiment of the invention, the cathode layer 20 is arranged in the sensing display area B, the cathode layer 20 includes a plurality of cathode electrodes 21 and a conducting layer 22, each first pixel opening 11 is correspondingly provided with one cathode electrode 21, the conducting layer 22 electrically connects the plurality of cathode electrodes 21, and the light transmittance of the conducting layer 22 is greater than that of the cathode electrodes 21, so that only the conducting layer 22 with a relatively high light transmittance is arranged in the sensing display area B except for the first pixel opening 11, and is not affected by the cathode electrodes 21 with a relatively low light transmittance, so that the light transmittance of the sensing display area B of the display panel can be effectively improved, and further, the functions of full-screen display and under-screen sensing are realized.
Specifically, with reference to fig. 1 and fig. 2, the display panel according to the embodiment of the present invention includes a display area and a non-display area, and the display area includes a normal display area a and a sensing display area B.
The display panel further includes a substrate 30, a thin film transistor array layer 40 disposed on the substrate 30, a pixel defining layer 10 disposed on the thin film transistor array layer 40, and a cathode layer 20 disposed on the pixel defining layer 10.
The substrate 30 includes a glass rigid substrate or a flexible substrate, and the material of the flexible substrate may be an organic resin material, which is not limited herein.
The thin film transistor array layer 40 includes thin film transistor devices disposed on the substrate 30 and a plurality of insulating layers covering the thin film transistor devices, wherein the thin film transistor devices include an active layer, a source electrode, a drain electrode, and a gate electrode, the gate electrode is not limited to a bottom gate or a top gate structure, and the material of the active layer is not limited to a metal oxide material or a polysilicon material.
The pixel defining layer 10 is disposed on the thin film transistor array layer 40, and the pixel defining layer 10 defines a plurality of pixel openings, and the plurality of pixel openings include a plurality of first pixel openings 11 located in the sensing display area B and a plurality of second pixel openings (not shown) located in the regular display area a.
The display panel further includes an anode electrode 50 disposed in each pixel opening, and a light emitting layer 60 disposed on the anode electrode 50, and a cathode layer 20 disposed on the pixel defining layer 10 and at least continuously covering the light emitting layer 60 in each first pixel opening 11, wherein the anode electrode 50 injects holes into the light emitting layer 60, and the cathode layer 20 injects electrons into the light emitting layer 60, and the electrons and the holes are recombined in the light emitting layer 60 to realize a light emitting function.
In an embodiment of the invention, with reference to fig. 1 and fig. 2, the cathode layer 20 is disposed on the pixel defining layer 10, and the cathode layer 20 includes a plurality of cathode electrodes 21 and a conducting layer 22, wherein the plurality of cathode electrodes 21 and the conducting layer 22 are at least located in the sensing display area B, each first pixel opening 11 is correspondingly provided with a cathode electrode 21, and the conducting layer 22 is electrically connected between the cathode electrodes 21.
In the present embodiment, each of the cathode electrodes 21 is disposed on the bottom and the sidewall of the corresponding first pixel opening 11, and since the bottom of each of the first pixel openings 11 is disposed with the anode electrode 50 and the light-emitting layer 60 stacked together, the cathode electrode 21 is located on the light-emitting layer 60 in the corresponding first pixel opening 11 and on the sidewall of the first pixel opening 11, and the orthographic projection of each of the cathode electrodes 21 on the pixel defining layer 10 is located within the coverage of the orthographic projection of the corresponding first pixel opening 11 on the pixel defining layer 10.
It should be noted that, in this embodiment, the light transmittance of the conducting layer 22 is greater than the light transmittance of the cathode electrode 21, and then in the sensing display area B of the display panel, except for the first pixel opening 11, only the conducting layer 22 with a relatively high light transmittance is disposed, and the cathode electrode 21 with a relatively low light transmittance is disposed only in the corresponding first pixel opening 11, so that the light transmittance in the sensing display area B can be effectively improved, and in the implementation and application process, the sensing efficiency and accuracy of the sensor can be improved.
In addition, the work function of the cathode electrode 21 is smaller than that of the conducting layer 22, so that the electron injection performance of the cathode electrode 21 is greater than that of the conducting layer 22, and the cathode electrode 21 is overlapped with the light emitting layer 60, so that the light emitting efficiency of the display panel can be improved.
Alternatively, the material of the cathode electrode 21 includes a magnesium-silver alloy, and the material of the conductive layer 22 includes indium zinc oxide or indium tin oxide.
In another embodiment of the present invention, with reference to fig. 2 and fig. 3, the cathode layer 20 is disposed on the pixel defining layer 10, and the cathode layer 20 includes a plurality of cathode electrodes 21 and a conducting layer 22, wherein the plurality of cathode electrodes 21 and the conducting layer 22 are at least located in the sensing display area B, each first pixel opening 11 is correspondingly provided with a cathode electrode 21, and the conducting layer 22 is electrically connected between the cathode electrodes 21.
In the present embodiment, each cathode electrode 21 is disposed only at the bottom of the corresponding first pixel opening 11, and since the anode electrode 50 and the light-emitting layer 60 are stacked at the bottom of each first pixel opening 11, the cathode electrode 21 is located on the light-emitting layer 60 in the corresponding first pixel opening 11, and the orthographic projection of each cathode electrode 21 on the pixel defining layer 10 is located within the coverage range of the orthographic projection of the corresponding first pixel opening 11 on the pixel defining layer 10.
It should be noted that, in this embodiment, the light transmittance of the conducting layer 22 is greater than the light transmittance of the cathode electrode 21, and then in the sensing display area B of the display panel, except for the first pixel opening 11, only the conducting layer 22 with a relatively high light transmittance is disposed, and the cathode electrode 21 with a relatively low light transmittance is disposed only in the corresponding first pixel opening 11, so that the light transmittance in the sensing display area B can be effectively improved, and in the implementation and application process, the sensing efficiency and accuracy of the sensor can be improved.
In addition, the work function of the cathode electrode 21 is smaller than that of the conducting layer 22, so that the electron injection performance of the cathode electrode 21 is greater than that of the conducting layer 22, and the cathode electrode 21 is overlapped with the light emitting layer 60, so that the light emitting efficiency of the display panel can be improved.
Alternatively, the material of the cathode electrode 21 includes a magnesium-silver alloy, and the material of the conductive layer 22 includes indium zinc oxide or indium tin oxide.
In another embodiment of the present invention, with reference to fig. 2 and fig. 4, the cathode layer 20 is disposed on the pixel defining layer 10, and the cathode layer 20 includes a plurality of cathode electrodes 21 and a conducting layer 22, wherein the plurality of cathode electrodes 21 and the conducting layer 22 are at least located in the sensing display area B, each first pixel opening 11 is correspondingly provided with a cathode electrode 21, and the conducting layer 22 is electrically connected between the cathode electrodes 21.
In the present embodiment, each of the cathode electrodes 21 is disposed on the bottom and the sidewall of the corresponding first pixel opening 11, and meanwhile, the cathode electrode 21 also extends to the edge of the first pixel opening 11, because the bottom of each of the first pixel openings 11 is disposed with the stacked anode electrode 50 and the light-emitting layer 60, the cathode electrode 21 is disposed on the light-emitting layer 60, the sidewall of the first pixel opening 11, and the edge of the first pixel opening 11 in the corresponding first pixel opening 11, and in the present embodiment, the orthographic projection of each of the cathode electrodes 21 on the pixel defining layer 10 covers the orthographic projection of the corresponding first pixel opening 11 on the pixel defining layer 10.
In the present embodiment, the light transmittance of the conductive layer 22 is greater than that of the cathode electrode 21.
It bears, a plurality of negative electrodes 21 are interval distribution on pixel definition layer 10, and the part that negative electrode 21 extends to outside first pixel opening 11 should be as few as possible, and then in display panel's sensing display area B, the area that only is provided with the great conduction layer 22 of luminousness is just bigger, and then can effectual improvement sensing display area B internal luminousness, implement the application in-process, then can improve the sensing efficiency and the accuracy of sensor.
In addition, the work function of the cathode electrode 21 is smaller than that of the conducting layer 22, so that the electron injection performance of the cathode electrode 21 is greater than that of the conducting layer 22, and the cathode electrode 21 is overlapped with the light emitting layer 60, so that the light emitting efficiency of the display panel can be improved.
Alternatively, the material of the cathode electrode 21 includes a magnesium-silver alloy, and the material of the conductive layer 22 includes indium zinc oxide or indium tin oxide.
The display panel further includes a signal terminal located in the non-display region, the conducting layer 22 is connected between each cathode electrode 21 and the signal terminal, and the anode electrode 50 is connected to the thin film transistor device in the thin film transistor array layer 40 to simultaneously transmit an electrical signal to the anode electrode 50 and the cathode electrode 21.
In an embodiment of the invention, the cathode layer 20 is disposed in the regular display area a in addition to the sensing display area B, that is, the whole surface of the cathode layer 20 is disposed on the pixel defining layer 10, each first pixel opening 11 is correspondingly provided with a cathode electrode 21, each second pixel opening is also correspondingly provided with a cathode electrode 21, the conducting layer 22 continuously covers the pixel defining layer 10 and is electrically connected to the plurality of cathode electrodes 21, and meanwhile, the conducting layer 22 also extends into the non-display area to be electrically connected to the signal terminal, so as to transmit the electrical signal to the plurality of cathode electrodes 21.
In another embodiment of the present invention, the plurality of cathode electrodes 21 are only disposed in the sensing display area B, that is, only one cathode electrode 21 is disposed in each first pixel opening 11, and the conducting layer 22 is disposed in the regular display area a and the sensing display area B, that is, the conducting layer 22 continuously covers the cathode electrodes 21 in the plurality of first pixel openings 11 and the plurality of second pixel openings, and the conducting layer 22 covers the light emitting layers 60 in the plurality of second pixel openings, so that electrons can be directly injected into the light emitting layers 60 as the cathode electrodes in the regular display area a, and meanwhile, the conducting layer 22 further extends into the non-display area to be electrically connected to the signal terminals, so as to transmit electrical signals to the plurality of cathode electrodes 21.
In another embodiment of the present invention, the cathode layer 20 is disposed only in the sensing display area B, and the display panel further includes a surface cathode layer (not shown) disposed in the regular display area a, and the surface cathode layer covers the plurality of second pixel openings and overlaps the light emitting layer 60 in each of the second pixel openings, and is further electrically connected between the conducting layer 22 and the signal terminal. Optionally, the material of the cathode facing layer includes a magnesium silver alloy or other metal materials, which is not limited herein.
In the embodiment of the present invention, the shape of the orthographic projection of each cathode electrode 21 on the pixel defining layer 10 is independently selected from a circle or a polygon. The shape of the orthographic projection of each first pixel opening 11 on the pixel defining layer 10 is also independently selected from a circle or a polygon, and the shape of each cathode electrode 21 and the shape of the corresponding first pixel opening 11 may be the same or different, and the embodiment of the present invention is described by taking the case that the shape of the first pixel opening 11 is the same as the shape of the cathode electrode 21.
Referring to fig. 5, the shape of the orthographic projection of the cathode electrode 21 on the pixel defining layer 10 is a circle, and the arrangement of the plurality of cathode electrodes 21 may be a rectangular array arrangement or a circular array arrangement, which is not limited herein.
In the embodiment of the invention, the cathode electrodes 21 are arranged in a circular shape, so that the tensile stress can be weakened, the arrangement stability of the cathode electrodes 21 can be improved, and the probability of stripping or damage of the cathode electrodes 21 can be reduced when the display panel is bent or bent.
Referring to fig. 6, the positive projection of the cathode electrode 21 on the pixel defining layer 10 is T-shaped, and the arrangement of the cathode electrodes 21 may be rectangular array arrangement or circular array arrangement, which is not limited herein.
In the embodiment of the present invention, the cathode electrode 21 is T-shaped, the first pixel opening 11 is also T-shaped, and the arrangement of the T-shaped pixel openings can reduce the number of monochrome pixels under the condition that the display panel has the same resolution, so as to reduce the number of the first pixel openings 11 and the number of the cathode electrodes 21, increase the light-transmitting area, and further improve the light transmittance.
Referring to fig. 7, the shape of the orthographic projection of the cathode electrode 21 on the pixel defining layer 10 is a rectangle, and the arrangement of the plurality of cathode electrodes 21 may be a rectangular array arrangement or a circular array arrangement, which is not limited herein.
In the embodiment of the present invention, the cathode electrode 21 is rectangular, the first pixel openings 11 are also rectangular, and the arrangement of the rectangular pixel openings can reduce the number of monochrome pixels under the condition that the display panel has the same resolution, so as to reduce the number of the first pixel openings 11 and the number of the cathode electrodes 21, increase the light-transmitting area, and further improve the light transmittance.
Referring to fig. 8, the shape of the orthographic projection of each cathode electrode 21 on the pixel defining layer 10 is independently selected from a circle, a T-shape or a rectangle, that is, the plurality of cathode electrodes 21 includes a circle cathode electrode 21, a T-shape cathode electrode 21 and a rectangle cathode electrode 21. The arrangement of the plurality of cathode electrodes 21 may be a rectangular array arrangement or a circular array arrangement, which is not limited herein.
The plurality of cathode electrodes 21 include a first cathode electrode and at least one second cathode electrode adjacent to the first cathode electrode, and the shape of the orthographic projection of the first cathode electrode on the pixel definition layer 10 is different from the shape of the orthographic projection of the second cathode electrode on the pixel definition layer 10. That is, the shape of the orthographic projection of one of the cathode electrodes 21 on the pixel defining layer 10 is circular, T-shaped or rectangular, and the shape of the orthographic projection of at least one cathode electrode 21 adjacent to the cathode electrode 21 on the pixel defining layer 10 is different from that of the cathode electrode 21. For example, the cathode electrodes 21 are arranged in rows and columns, and the orthogonal projections of two adjacent cathode electrodes 21 in the same row on the pixel defining layer 10 have different shapes.
In the embodiment of the present invention, the plurality of cathode electrodes 21 include a circular cathode electrode 21, a T-shaped cathode electrode 21 and a rectangular cathode electrode 21, and for the arrangement of the plurality of cathode electrodes 21, the boundaries of the cathode electrodes 21 are distributed irregularly, so as to improve the diffraction phenomenon generated in the light propagation process in the sensing display area B, and in the implementation and application process, to improve the sensing effect of the sensor.
To sum up, in the embodiment of the present invention, the cathode layer 20 is disposed in the sensing display area B, the cathode layer 20 includes a plurality of cathode electrodes 21 and a conducting layer 22, each first pixel opening 11 is correspondingly disposed with one cathode electrode 21, the conducting layer 22 electrically connects the plurality of cathode electrodes 21, and the light transmittance of the conducting layer 22 is greater than the light transmittance of the cathode electrodes 21, so that the conducting layer 22 with a larger light transmittance can be disposed in the sensing display area B except for the first pixel opening 11, and cannot be affected by the cathode electrodes 21 with a smaller light transmittance, and further the light transmittance of the sensing display area B of the display panel can be effectively improved, thereby further realizing the functions of full-screen display and under-screen sensing.
In addition, an embodiment of the present invention further provides a display device, and the display device includes the display panel and the sensor assembly described in the above embodiment, and the sensor assembly is disposed on one side of the display panel corresponding to the sensing display area B.
In the embodiment of the invention, the cathode layer 20 is arranged in the display panel to improve the light transmittance in the sensing display area B, so that the light sensing effect and efficiency of the sensor assembly can be improved. For example, when the sensor component is a camera, the imaging definition and the photographing effect of the camera can be improved; when the sensor assembly is a touch module, the touch accuracy and the success rate can be improved.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The display panel and the display device provided by the embodiment of the present invention are described in detail above, and the principle and the embodiment of the present invention are explained by applying a specific example herein, and the description of the above embodiment is only used to help understanding the technical solution and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A display panel is characterized in that the display panel comprises a regular display area and a sensing display area adjacent to the regular display area;
the display panel further includes:
a pixel defining layer including a plurality of first pixel openings in the sensing display area; and
the cathode layer is arranged on the pixel definition layer and comprises a plurality of cathode electrodes and a conducting layer, the plurality of cathode electrodes are arranged at intervals, each first pixel opening is correspondingly provided with one cathode electrode, the conducting layer is at least positioned in the sensing display area and electrically connected with each cathode electrode, and the orthographic projection of each cathode electrode on the pixel definition layer is positioned within the coverage range of the orthographic projection of the corresponding first pixel opening on the pixel definition layer;
the light transmittance of the conducting layer is greater than that of each cathode electrode, the conducting layer continuously covers the pixel definition layer and covers the plurality of cathode electrodes, the plurality of cathode electrodes comprise a first cathode electrode and at least one second cathode electrode adjacent to the first cathode electrode, and the orthographic projection shape of the first cathode electrode on the pixel definition layer is different from the orthographic projection shape of the second cathode electrode on the pixel definition layer.
2. The display panel of claim 1, wherein the shape of the orthographic projection of each of the cathode electrodes on the pixel defining layer is independently selected from a circle or a polygon.
3. The display panel of claim 1, further comprising an anode electrode disposed in each of the first pixel openings, a light emitting layer disposed on the anode electrode, and a signal terminal disposed in a non-display region of the display panel, wherein the cathode electrode is disposed on the light emitting layer, and the conducting layer is electrically connected between each of the cathode electrodes and the signal terminal.
4. The display panel of claim 3, wherein the display panel further comprises a surface cathode layer disposed on the pixel definition layer and in the normal display area, the pixel definition layer further comprises a plurality of second pixel openings in the normal display area, and the surface cathode layer covers the plurality of second pixel openings and is electrically connected between the conductive layer and the signal terminals.
5. The display panel according to claim 1, wherein a work function of the cathode electrode is smaller than a work function of the conductive layer.
6. The display panel according to claim 1, wherein a material of the cathode electrode comprises a magnesium-silver alloy, and a material of the conductive layer comprises indium zinc oxide or indium tin oxide.
7. A display device, comprising the display panel according to any one of claims 1 to 6 and a sensor element, wherein the sensor element is disposed on one side of the display panel corresponding to the sensing display area.
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| CN111463356B (en) * | 2020-04-20 | 2022-08-09 | 昆山国显光电有限公司 | Display panel, preparation method of display panel and display device |
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| CN113054134A (en) * | 2021-03-09 | 2021-06-29 | 武汉华星光电半导体显示技术有限公司 | Display panel |
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| CN113629207A (en) | 2021-11-09 |
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