CN113690384A - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN113690384A CN113690384A CN202110915684.8A CN202110915684A CN113690384A CN 113690384 A CN113690384 A CN 113690384A CN 202110915684 A CN202110915684 A CN 202110915684A CN 113690384 A CN113690384 A CN 113690384A
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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
- H10K50/81—Anodes
- H10K50/816—Multilayers, e.g. transparent multilayers
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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
- H10K50/828—Transparent cathodes, e.g. comprising thin metal layers
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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
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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
- H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
- H10K59/65—OLEDs integrated with inorganic image sensors
Abstract
The invention provides a display panel and a display device, which comprise a substrate, and a first light-emitting assembly and a second light-emitting assembly which are positioned on the substrate, wherein the substrate comprises a display area and a camera area, the first light-emitting assembly is positioned in the display area, and the second light-emitting assembly is positioned in the camera area. The second light-emitting component comprises a first electrode layer, a light-emitting layer and a second electrode layer which are sequentially arranged on the substrate, and the second electrode layer is a transparent electrode, so that the light transmittance of the camera area can be improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel and a display device.
Background
The Organic Light-Emitting Diode (OLED) display panel has the advantages of self-luminescence, no need of a backlight source, high contrast, wide color gamut, thin thickness, high reaction speed, applicability to a flexible panel, and the like, and particularly, the top-emission OLED display panel has the advantages of high aperture ratio, and the like, and is considered as a new next-generation flat panel display technology.
To achieve a full screen, the under-screen camera technology has become the focus of screen technology. The current scheme for realizing the under-screen camera mainly comprises pixel circuit design, cathode imaging, partial removal of a polaroid and the like.
None of these schemes can avoid the problem of non-transmission (i.e. non-transmission in the light-emitting pixel region) on both sides of the anode/cathode of the OLED. The anode of the existing OLED is an opaque electrode, while the cathode is a semitransparent electrode, and the transmissivity is generally 40% -60%. Resulting in a large amount of light not being emitted.
Disclosure of Invention
The invention aims to provide a display panel and a display device, aiming at improving the light transmittance of a camera area.
In one aspect, the present invention provides a display panel comprising:
a substrate including a display area and a camera area;
the first light-emitting assembly is positioned on the substrate and positioned in the display area;
the second light-emitting component is positioned on the substrate and positioned in the camera area and comprises a first electrode layer, a light-emitting layer and a second electrode layer which are sequentially positioned on the substrate;
wherein the second electrode layer is a transparent electrode.
More preferably, the first electrode layer is a cathode, and the second electrode layer is an anode; the light-emitting layer comprises an electron injection layer, an electron transport layer, a pixel layer, a hole transport layer and a hole injection layer which are sequentially arranged on the first electrode layer.
More preferably, the first electrode layer is an anode, and the second electrode layer is a cathode; the light-emitting layer comprises a hole injection layer, a hole transport layer, a pixel layer, an electron transport layer and a first electron injection layer which are sequentially arranged on the first electrode layer.
Further preferably, the light-emitting layer further includes a metal layer on the first electron injection layer and a second electron injection layer on the metal layer.
Further preferably, the first electrode layer is a transparent electrode.
Further preferably, the first light emitting assembly includes an anode, a hole injection layer, a hole transport layer, a pixel layer, an electron transport layer, and an electron injection layer, which are sequentially disposed on the substrate.
Further preferably, the second electrode layer includes:
a protective layer on the light emitting layer;
and the indium tin oxide layer is positioned on the protective layer.
More preferably, the thickness of the protective layer is 20nm or less.
Further preferably, the method further comprises the following steps:
a first thin film transistor layer located between the substrate and the first light emitting assembly and located in the display region;
and the second thin film transistor layer is positioned between the substrate and the second light-emitting component and positioned in the camera area.
In another aspect, the present invention provides a display device including the display panel described in any one of the above.
The invention has the beneficial effects that: the display panel comprises a substrate, a first light-emitting assembly and a second light-emitting assembly, wherein the first light-emitting assembly and the second light-emitting assembly are positioned on the substrate, the substrate comprises a display area and a camera area, the first light-emitting assembly is positioned in the display area, and the second light-emitting assembly is positioned in the camera area. The second light-emitting component comprises a first electrode layer, a light-emitting layer and a second electrode layer which are sequentially arranged on the substrate, and the second electrode layer is a transparent electrode, so that the light transmittance of the camera area can be improved.
Drawings
The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.
Fig. 1 is a schematic structural diagram of a display panel according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a display panel according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a display panel according to a third 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
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, fig. 1 is a schematic structural diagram of a display panel 100 according to a first embodiment of the present invention. The display panel 100 includes a substrate 110 and a first light emitting assembly 120 and a second light emitting assembly 130 on the substrate 110. The substrate 110 includes a display region 111 and a camera region 112, the first light emitting device 120 is located in the display region 111, and the second light emitting device 130 is located in the camera region 112. The second light emitting assembly 130 includes a first electrode layer 131, a light emitting layer 132, and a second electrode layer 133 sequentially disposed on the substrate 110, and the second electrode layer 133 is a transparent electrode.
In this embodiment, the first electrode layer 131 serves as a cathode, the second electrode layer 133 serves as an anode, and the light emitting layer 132 includes an electron injection layer, an electron transport layer, a pixel layer, a hole transport layer, and a hole injection layer, which are sequentially disposed on the first electrode layer 131. Since the second electrode layer 133, which is an anode, is located at the top, current flows from the top to the bottom, and thus the second light emitting element 130 of the display panel 100 is suitable for NMOS driving.
In this embodiment, the first light emitting element 120 includes an anode 121, a light emitting material layer 122 (including a hole injection layer, a hole transport layer, a pixel layer, an electron transport layer, and an electron injection layer) on the substrate 110, and a cathode 123 on the electron injection layer, so that the layers of the second light emitting element 130 and the first light emitting element 120 are upside down. Since the cathode 123 of the first light emitting element 120 is located above the anode 121, the current flows from bottom to top, and thus the first light emitting element 120 is suitable for PMOS driving.
The anode is connected with the anode of the device applied with a driving voltage, and holes in the anode can move to a pixel layer in the device under the driving of the applied driving voltage. The hole injection layer can modify the anode of the device and can smoothly inject holes from the anode into the hole transport layer. The hole transport layer serves to transport holes to the pixel layer. The light-emitting layer may also include an electron blocking layer that blocks electrons from the cathode at the device pixel layer interface, increasing the concentration of electrons at the device pixel layer interface. The pixel layer is where the device electrons and holes recombine to form excitons which then de-excite to emit light. The light-emitting layer can also comprise a hole blocking layer, and the hole blocking layer can block holes from the anode at the interface of the pixel layer of the device, so that the recombination probability of electrons and holes at the interface of the pixel layer of the device is improved, and the light-emitting efficiency of the device is improved. The electron transport layer serves to transport electrons from the cathode into the pixel layer of the device. The electron injection layer serves to modify the cathode and transport electrons to the electron transport layer. Electrons in the cathode will move towards the pixel layer of the device under the drive of the applied drive voltage of the device and then recombine with holes from the anode at the pixel layer. The pixel layer may include red, blue, and green sub-pixels, which are all organic light emitting materials.
In this embodiment, the anode 121 of the first light emitting assembly 120 may adopt an opaque ITO/Ag/ITO stacked structure, and the cathode 123 of the first light emitting assembly 120 may adopt translucent Ag or Mg: Ag alloy. The second electrode layer 133 (anode) of the second light emitting element 130 may be ITO or IZO or some other transparent electrode, and the first electrode layer 131 (cathode) may be Ag or Mg-Ag alloy that is transparent to light.
In this embodiment, the second electrode layer 133 may include a protective layer (not shown) on the light emitting layer 132, and an Indium Tin Oxide (ITO) layer on the protective layer. The protective layer can be organic or inorganic material, such as MO3 or pentacene, and can be formed on the hole injection layer by evaporation to a thickness of 20nm or less, and the indium tin oxide layer can be formed on the protective layer by sputtering to a thickness of 20nm or less
The display panel 100 may further include a first thin-film-transistor layer 140 located between the substrate 110 and the first light-emitting assembly 120 and located in the display area 111, and a second thin-film-transistor layer 150 located between the substrate 110 and the second light-emitting assembly 130 and located in the camera area 112. Preferably, the first electrode layer 131 (cathode) of the second light emitting element 130 may be prepared together with the second thin film transistor, and is easily patterned.
In the display panel 100 according to the first embodiment of the present invention, the second electrode layer 133 (anode) of the second light emitting element 130 in the camera area 112 is configured as a transparent electrode, and the anode of the inverted second light emitting element 130 does not need to have an emitting function, so that Ag may not be used, and only transparent ITO may be used. Because the ITO has a high transmittance property (transmittance of 90% to 95%), the transmittance of the visible light in the camera area 112 can be greatly improved to enhance the photographing effect.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a display panel 200 according to a second embodiment of the present invention, where the display panel 200 includes a substrate 210, and a first light emitting element 220 and a second light emitting element 230 located on the substrate 210. The substrate 210 includes a display area 211 and a camera area 212, the first light emitting device 220 is located in the display area 211, and the second light emitting device 230 is located in the camera area 212. The second light emitting assembly 230 includes a first electrode layer 231, a light emitting layer 232, and a second electrode layer 233 sequentially disposed on the substrate 210, and the second electrode layer 233 is a transparent electrode.
In this embodiment, the first electrode layer 231 serves as an anode, the second electrode layer 233 serves as a cathode, and the light emitting layer 232 includes a hole injection layer, a hole transport layer, a pixel layer, an electron transport layer, and an electron injection layer, which are sequentially disposed on the substrate 210. The first light emitting assembly 220 includes an anode 221, a light emitting material layer 222 (including a hole injection layer, a hole transport layer, a pixel layer, an electron transport layer, and an electron injection layer), and a cathode 223 sequentially on the substrate 210. Since the cathodes of the first and second light emitting elements 220 and 230 are located above the anodes, current flows from bottom to top, and thus both are suitable for PMOS driving.
The display panel 200 is different from the display panel 100 provided in the first embodiment in that the first electrode layer 231 of the second light emitting element 230 is used as an anode, the second electrode layer 233 is used as a cathode, that is, the anode is on the bottom, and the cathode is on the top.
The first electrode layer 231 (anode) may be a light-opaque ITO/Ag/ITO stacked structure, and the second electrode layer 233 (cathode) is a transparent electrode, such as ITO.
Preferably, in order to ensure the light emitting effect, a metal layer and a second electron injection layer may be added between the first electron injection layer and the second electrode layer 233, that is, the light emitting layer 232 may further include a metal layer on the first electron injection layer and a second electron injection layer on the metal layer. The metal layer may be Al or Mg: ag (1:9) alloy, the thickness of the metal layer may be 2 nm.
In the display panel 200 according to the second embodiment of the present invention, the second electrode layer 233 (cathode) is a transparent electrode, which can improve the light transmittance of the cathode and the light transmittance of the second light emitting element 230. In addition, since both the first light emitting element 220 and the second light emitting element 230 are suitable for PMOS driving, it is advantageous to use the same driving scheme for the display area 211 and the camera area 212.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a display panel 300 according to a third embodiment of the present invention, in which the display panel 300 includes a substrate 310, and a first light emitting element 320 and a second light emitting element 330 disposed on the substrate 310. The substrate 310 includes a display region 311 and a camera region 312, the first light emitting device 320 is located in the display region 311, and the second light emitting device 330 is located in the camera region 312. The second light emitting assembly 330 includes a first electrode layer 331, a light emitting layer 332, and a second electrode layer 333 sequentially disposed on the substrate 310, and the second electrode layer 333 is a transparent electrode (e.g., ITO).
In this embodiment, the first electrode layer 331 serves as an anode, the second electrode layer 333 serves as a cathode, and the light emitting layer 332 includes a hole injection layer, a hole transport layer, a pixel layer, an electron transport layer, and an electron injection layer, which are sequentially disposed on the substrate 310. The first light emitting assembly 320 includes an anode 321, a light emitting material layer 322 (including a hole injection layer, a hole transport layer, a pixel layer, an electron transport layer, and an electron injection layer), and a cathode 323 sequentially on the substrate 310. Since the cathodes of the first light emitting element 320 and the second light emitting element 330 are located above the anodes, current flows from bottom to top, and thus both are suitable for PMOS driving.
The display panel 300 is different from the display panel 200 provided in the second embodiment in that the first electrode layer 331 is also a transparent electrode, such as a metal layer with high transmittance, for example, ITO or IZO, so that the first electrode layer 331 and the second electrode layer 333 are both transparent electrodes, and the transmittance of the camera area 312 can be further improved.
The display panel 300 may further include a first thin-film-transistor layer 340 between the substrate 310 and the first light-emitting assembly 320 and in the display region 311, and a second thin-film-transistor layer 350 between the substrate 310 and the second light-emitting assembly 330 and in the camera region 312.
In the display panel 300 according to the third embodiment of the present invention, the first electrode layer 331 and the second electrode layer 333 are both transparent electrodes to form the fully transparent second light emitting element 330, so that the transmittance of the under-screen camera area 312 can be greatly improved.
Embodiments of the present invention further provide a display device including any one of the display panels, so that the display device has the same beneficial effects as any one of the display panels, which are not described herein again.
The above description of the embodiments is only for helping understanding the technical solution of the present invention and its core idea; 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 (10)
1. A display panel, comprising:
a substrate including a display area and a camera area;
the first light-emitting assembly is positioned on the substrate and positioned in the display area;
the second light-emitting component is positioned on the substrate and positioned in the camera area and comprises a first electrode layer, a light-emitting layer and a second electrode layer which are sequentially positioned on the substrate;
wherein the second electrode layer is a transparent electrode.
2. The display panel according to claim 1, wherein the first electrode layer is a cathode and the second electrode layer is an anode; the light-emitting layer comprises an electron injection layer, an electron transport layer, a pixel layer, a hole transport layer and a hole injection layer which are sequentially arranged on the first electrode layer.
3. The display panel according to claim 1, wherein the first electrode layer is an anode, and the second electrode layer is a cathode; the light-emitting layer comprises a hole injection layer, a hole transport layer, a pixel layer, an electron transport layer and a first electron injection layer which are sequentially arranged on the first electrode layer.
4. The display panel according to claim 3, wherein the light-emitting layer further comprises a metal layer on the first electron injection layer and a second electron injection layer on the metal layer.
5. The display panel according to claim 3, wherein the first electrode layer is a transparent electrode.
6. The display panel according to claim 1, wherein the first light emitting element comprises an anode, a hole injection layer, a hole transport layer, a pixel layer, an electron transport layer, and an electron injection layer sequentially disposed on the substrate.
7. The display panel according to claim 1, wherein the second electrode layer comprises:
a protective layer on the light emitting layer;
and the indium tin oxide layer is positioned on the protective layer.
8. The display panel according to claim 7, wherein the protective layer has a thickness of 20nm or less.
9. The display panel according to claim 1, further comprising:
a first thin film transistor layer located between the substrate and the first light emitting assembly and located in the display region;
and the second thin film transistor layer is positioned between the substrate and the second light-emitting component and positioned in the camera area.
10. A display device characterized by comprising the display panel according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110915684.8A CN113690384A (en) | 2021-08-10 | 2021-08-10 | Display panel and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110915684.8A CN113690384A (en) | 2021-08-10 | 2021-08-10 | Display panel and display device |
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| CN113690384A true CN113690384A (en) | 2021-11-23 |
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| JP2005044799A (en) * | 2003-07-10 | 2005-02-17 | Dainippon Printing Co Ltd | Organic electroluminescent device |
| CN104409649A (en) * | 2014-11-20 | 2015-03-11 | 天津理工大学 | Low-voltage and high-efficiency organic LED and preparation method thereof |
| CN109545827A (en) * | 2018-11-21 | 2019-03-29 | 惠科股份有限公司 | Display panel and display device |
| CN109801950A (en) * | 2019-01-31 | 2019-05-24 | 厦门天马微电子有限公司 | The production method of display panel, display device and display panel |
| CN110148611A (en) * | 2019-04-28 | 2019-08-20 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
| CN110729337A (en) * | 2019-11-15 | 2020-01-24 | 京东方科技集团股份有限公司 | Display substrate, manufacturing method thereof and electronic device |
-
2021
- 2021-08-10 CN CN202110915684.8A patent/CN113690384A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005044799A (en) * | 2003-07-10 | 2005-02-17 | Dainippon Printing Co Ltd | Organic electroluminescent device |
| CN104409649A (en) * | 2014-11-20 | 2015-03-11 | 天津理工大学 | Low-voltage and high-efficiency organic LED and preparation method thereof |
| CN109545827A (en) * | 2018-11-21 | 2019-03-29 | 惠科股份有限公司 | Display panel and display device |
| CN109801950A (en) * | 2019-01-31 | 2019-05-24 | 厦门天马微电子有限公司 | The production method of display panel, display device and display panel |
| CN110148611A (en) * | 2019-04-28 | 2019-08-20 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
| CN110729337A (en) * | 2019-11-15 | 2020-01-24 | 京东方科技集团股份有限公司 | Display substrate, manufacturing method thereof and electronic device |
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