CN110148611B - Display panel and display device - Google Patents

Display panel and display device Download PDF

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Publication number
CN110148611B
CN110148611B CN201910349407.8A CN201910349407A CN110148611B CN 110148611 B CN110148611 B CN 110148611B CN 201910349407 A CN201910349407 A CN 201910349407A CN 110148611 B CN110148611 B CN 110148611B
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layer
display panel
display
transparent
camera
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CN110148611A (en
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倪晶
简庆宏
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Priority to CN201910349407.8A priority Critical patent/CN110148611B/en
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Priority to PCT/CN2019/106624 priority patent/WO2020220568A1/en
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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
    • 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
    • H10K50/84—Passivation; Containers; Encapsulations
    • H10K50/842—Containers
    • H10K50/8426—Peripheral sealing arrangements, e.g. adhesives, sealants
    • 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

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

The invention provides a display panel, which is provided with a transparent display area and a conventional display area surrounding the transparent display area, wherein at least one organic light-emitting device is arranged in the transparent display area, the organic light-emitting device comprises an anode, the anode comprises a first transparent electrode, a second transparent electrode and a metal layer clamped between the first transparent electrode and the second transparent electrode, and a hollow area is arranged on the metal layer; and supporting columns formed by high-light-transmittance materials are filled in the hollow areas. The invention also provides a display device using the display panel. The display device can improve the ambient light incident quantity of the camera, thereby simultaneously improving the light capturing capability and the imaging effect of the camera.

Description

Display panel and display device
Technical Field
The invention relates to the technical field of display, in particular to a display device.
Background
The Organic Light-Emitting Diode (OLED) has the advantages of high brightness, rich colors, low driving voltage, fast response speed, low power consumption, good anti-seismic performance, large viewing angle range, thin thickness and the like. Therefore, OLEDs have great potential for solid state lighting and flat panel displays, and OLED panels are becoming the choice of more and more manufacturers.
With the development of science and technology, people have higher and higher requirements on the beauty and the lightness and thinness of mobile phones, and the full-screen mobile phone with high color value and high technological sense and strong visual impact begins to play the red-playing mobile phone market, so that the mobile phone becomes the pursuit direction of various manufacturers. However, due to the limitations of the existing front camera setting position and installation technology, the real screen ratio of most mobile phones on the market is uneven. The camera product under the screen becomes a potential display device design at present due to the characteristics of high screen occupation ratio, small influence of the camera on visual pictures and the like.
The camera display device under the screen is characterized in that a camera is arranged on the back surface of a substrate of a display panel, and meanwhile, a corresponding ambient light incident path is formed on the display panel, so that ambient light can penetrate through the display panel to enter the camera. Because the ambient light passes through the display panel in-process, its positive pole metal level has strong reflection effect, can reflect the loss of the incident ambient light in a large number, leads to entering into the camera ambient light greatly to reduce, finally influences the formation of image effect.
Therefore, it is desirable to provide a display panel and a display device, in which the anode can avoid the reflection of the ambient light and improve the light-capturing capability of the camera, so as to solve the above problems.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned shortcomings in the prior art, and provides a display panel with a high anode transmittance, and a display device using the display panel.
In order to achieve the purpose, the invention adopts the following technical scheme.
A display panel is provided with a transparent display area and a conventional display area surrounding the transparent display area, at least one organic light-emitting device is arranged in the transparent display area, the organic light-emitting device comprises an anode, the anode comprises a first transparent electrode, a second transparent electrode and a metal layer clamped between the first transparent electrode and the second transparent electrode, and a hollow area is arranged on the metal layer.
Furthermore, the hollow area is filled with support columns formed by high-light-transmittance materials, and the high-light-transmittance materials are graphene and Al2O3Or ZrO.
Further, the material of the metal layer is one or more of silver, magnesium, aluminum, platinum, palladium, gold, nickel, neodymium, iridium, chromium or copper.
Further, the material of the first transparent electrode and the second transparent electrode is one or more of indium tin oxide, indium zinc oxide, zinc oxide and indium oxide.
Further, the organic light-emitting device further comprises an organic light-emitting layer and a cathode which are sequentially stacked and covered on the anode.
Further, the cathode is a transparent electrode; the cathode is formed by mixing one or more of indium tin oxide, indium zinc oxide, zinc oxide and indium oxide.
Further, the cathode is a metal electrode; the metal electrode material is one or more of aluminum, silver or lithium.
Further, the organic light-emitting device further comprises at least one organic layer, and the organic layer can be a hole injection layer, a hole transport layer, an electron injection layer or an electron transport layer.
The invention also provides a display device comprising a display panel as claimed in claims 1 to 8 and a camera assembly having a camera corresponding to the transparent display area of the display panel.
Further, the area of the transparent display area is the same as the cross-sectional area of the camera.
The invention has the advantages that: the organic light-emitting device is arranged in the transparent display area of the display panel, so that the transparent display area of the display panel has normal display and ambient light transmission functions; the metal layer of the anode in the transparent display area of the display panel is provided with the hollow area, so that the reflection of the metal layer to ambient light can be reduced, and the light transmittance of the ambient light is improved; the support columns formed by high-light-transmittance materials are filled in the hollow areas of the display panel, so that ambient light can be transmitted and the second transparent electrode is prevented from being sunken; the display panel disclosed by the invention is simple and stable in structure and good in display and shooting effects. The display device can simultaneously realize the functions of screen display and under-screen camera shooting, and is beneficial to realizing a full-screen.
Drawings
Fig. 1 is a schematic structural diagram of a display panel according to the present invention.
Fig. 2 is a cross-sectional view of an embodiment of a display device of the present invention.
Fig. 3 is a cross-sectional view of another embodiment of the display device 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.
As shown in fig. 1, the present invention provides a display panel 10, wherein the display panel 10 has a transparent display area 10a and a regular display area 10b surrounding the transparent display area 10 a.
As shown in fig. 2 and 3, the display panel 10 includes a substrate 100, and an array layer 200, an organic light emitting device 300, and a thin film encapsulation layer 400 sequentially stacked on the substrate 100. At least one organic light emitting device 300 is disposed in the transparent display region 10a, and the organic light emitting device 300 includes an anode 310, a cathode 330, and an organic light emitting layer 320 disposed between the anode 310 and the cathode 330.
Please continue to refer to fig. 2 and fig. 3. The anode 300 includes a first transparent electrode 311, a second transparent electrode 313, and a metal layer 312 sandwiched between the first transparent electrode 311 and the second transparent electrode 313, and a hollow area 3121 is formed on the metal layer 312. When the ambient light is transmitted to the anode 310 by the display panel 10, the ambient light can directly pass through the hollow region 3121, which reduces the reflection of the metal layer 312 to the ambient light and increases the light transmittance of the transparent display region 10a of the display panel 10.
As shown in fig. 2 and 3, when a camera assembly 20 is disposed under the display panel 10 in an overlapping manner and a camera of the camera assembly 20 corresponds to the transparent display area 10a of the display panel 10, the camera of the camera assembly 20 can sense ambient light incident from the transparent display area 10a of the display panel 10. By providing the hollowed-out area 3121 on the metal layer 312, a high transmittance of the anode 310 to ambient light can be achieved, thereby improving the light capturing capability and the imaging effect of the camera assembly 20.
As shown in fig. 3. The support column 3122 formed by high light transmittance material is filled in the hollow area 3121. The supporting posts 3122 can support the second transparent electrode 313 and prevent the second transparent electrode 313 from being recessed in the hollowed-out region 3121. Meanwhile, the supporting posts 3122 can transmit ambient light and concentrate the ambient light in the supporting posts 3122 during transmission, preventing the ambient light from being scattered and lost, thereby further increasing the amount of incident ambient light of the camera assembly 20.
In a specific implementation, the first transparent electrode 311 and the second transparent electrode 313 are made of Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), zinc oxide (ZnO), and indium oxide (In)2O3) Etc. of a transparent conductive oxide material. The transparent conductive oxide has not only good light transmittance and conductivity, but also a high work function, and is easily matched with an organic material such as a hole injection layer (HIM) to achieve an optimal energy level, so as to reduce a driving voltage of the organic light emitting device 300 and improve a light emitting performance. In this embodiment, ITO electrodes are used for the first transparent electrode 311 and the second transparent electrode 313. In the actual manufacturing process, the ITO transparent electrode is manufactured by adopting a PVD sputter sputtering process.
The metal layer 312 may be formed of one or more of silver (Ag), magnesium (Mg), aluminum (Al), platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), and chromium (Cr) by mixing. In this embodiment, the metal layer 312 is made of Ag. In a specific process, a PVD sputter is adopted to perform sputtering on the first transparent electrode 311 to obtain a complete Ag film, and then, local exposure, development and etching are performed to obtain a locally etched metal Ag film, so as to form the hollowed-out region 3121.
The high light transmittance material comprises a light-transmitting conductive material and a light-transmitting non-conductive material. The light-transmitting conductive material can be graphene, and the light-transmitting non-conductive material can be Al2O3Or ZrO. In the actual process, the graphene is prepared by evaporation, and Al2O3Or ZrO is prepared by adopting an ALD or PVD mode.
The organic light emitting layer 320 is disposed on the second transparent electrode 313 of the anode 310 in a cladding manner. The organic light emitting layer 320 is composed of a light emitting material layer. The luminescent material layer comprises one or more of a red luminescent material layer, a green luminescent material layer, a blue luminescent material layer or a white luminescent material layer. Common luminescent materials include small molecule luminescent materials, polymer luminescent materials, and dendrimer luminescent materials. Generally, the small molecule luminescent material is usually vacuum evaporation process, the high molecule luminescent material is mostly spin coating or ink jet process, and the dendrimer luminescent material can be selected according to the molecular weight.
In a specific implementation, the organic light emitting device 300 further includes at least one organic layer, and the organic layer is a hole injection layer (HIM), a hole transport layer (HTM), an Electron Injection Layer (EIL), or an Electron Transport Layer (ETL).
The cathode 330 is located on the opposite side of the organic light emitting layer 320 from the anode 310. The organic light emitting layer 320 may be made to emit light by an electro-luminescence principle by applying a voltage between the anode 310 and the cathode 330. The self-luminous light of the organic light emitting layer 320 passes through the cathode 330. In specific implementation, the cathode 330 may be Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), zinc oxide (ZnO), or indium oxide (In)2O3) Or a transparent electrode material, or a metal electrode material such as aluminum (Al), silver (Ag), or lithium (Li).
The substrate 100 is transparent or has a high transmittance in a visible light band. Specifically, the substrate 100 may be formed of a suitable material among plastic materials such as a glass material, quartz, a metal material, or the like including polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or polyimide. In the present embodiment, in order to improve the bending resistance and the light transmittance of the display panel 10, the substrate 100 can be a PI substrate.
The array layer 200 is formed between the substrate 100 and the organic light emitting device 300. The array layer 200 includes a plurality of TFTs arranged in an array, and the TFTs are used for switching devices and driving devices of the organic light emitting device 300. In a specific implementation, before forming the TFT, another Layer such as a Buffer Layer (BL) or an adhesive Layer may be formed on the entire surface of the substrate 100 or by patterning.
The buffer layer may have any suitable material, such as PET, PEN, polyacrylate, and/or polyimide, and may be stacked in a single layer or multiple layers to form a laminated structure. The buffer layer may also be formed of silicon oxide or silicon nitride, or may include a composite layer of an organic material and/or an inorganic material.
The cross-sectional structure of the TFT comprises an active layer, a first insulating layer, a grid electrode insulating layer, a drain electrode, a source electrode, an interlayer insulating layer and the like.
The active layer may be formed of an amorphous silicon layer, a silicon oxide layer, a metal oxide, a polysilicon layer, or an organic semiconductor material. The source and drain electrodes may be formed of a single material layer or a composite material layer including at least one material of aluminum (Al), platinum (Pt), palladium (Pd), silver (Ag), magnesium (Mg), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), lithium (Li), calcium (Ca), molybdenum (Mo), titanium (Ti), tungsten (W), and copper (Cu), or other suitable alloys.
As shown in fig. 2, a thin film encapsulation layer 400 is required to be disposed on a side of the cathode 330 away from the anode 310 to prevent organic materials and metal electrodes of the display panel 10 from being oxidized or crystallized by moisture and oxygen and thus from failing.
The thin film encapsulation layer 400 includes inorganic thin film layers and organic thin film layers alternately disposed. The inorganic thin film layer is made of silicon oxide or silicon nitride, and the organic thin film layer is made of colorless and transparent polyimide, polyurethane, polyethylene terephthalate or polyethylene naphthalate. In a specific manufacturing process of the display device, the inorganic thin film layer is deposited by ALD or PECVD, and the organic thin film layer is deposited by inkjet printing (IJP) or Spin Coating (Spin Coating).
In this embodiment, the thin film encapsulation layer 400 sequentially includes a first inorganic thin film layer 410, an organic thin film layer 420, and a second inorganic thin film layer 430 in a direction gradually away from the anode 310.
As shown in fig. 2 and fig. 3, the present invention further provides a display device, which includes the display panel 10 and a camera assembly 20 stacked together, wherein the camera assembly 20 has a camera, and the camera corresponds to the transparent display area 10a of the display panel 10.
In the display device provided by the embodiment of the invention, when shooting is performed, the organic light emitting layer 320 in the transparent display area 10a does not emit light; at this time, the imaging light signal of the object, i.e., the diffuse reflection light signal thereof, sequentially passes through the thin film encapsulation layer 400, the anode layer 310, the organic light emitting layer 320, the cathode layer 330 and the thin film encapsulation layer 400 in the display panel 100 and enters the camera of the camera assembly 20, so as to obtain the image of the object. When not shooting, the camera assembly 20 is in a non-working state, and the organic light emitting layer 320 of the transparent display area 10a is self-luminous; the self-luminous light of the organic light emitting layer 320 is emitted through the cathode 330 and the encapsulation layer 400 for display.
The hollowed-out area 3121 is disposed on the metal layer 312 of the transparent display area 10a, such that the ambient light entering the camera assembly 20 through the anode 310 is not reflected by the metal layer 312 any more, but directly continues to pass through the second transparent electrode 313 and the first transparent electrode 311 to exit from the substrate 100 and enter the camera assembly 20. Therefore, when the camera is used, the ambient light irradiated into the camera can be enhanced, and the imaging quality is improved.
In particular, the metal layer 312 in the regular display region 10b of the display panel 100 may still remain. That is, the reflection of the self-luminous light of the organic light emitting layer 320 by the anode 310 in the normal display area 10b still exists, and the light output of the cathode 330 in the normal display area 10b can be increased to improve the display effect.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (8)

1. A display panel has a transparent display region and a normal display region surrounding the transparent display region And the conventional display area is internally provided with at least one organic light-emitting device and a camera respectively, and the camera corresponds to the transparent display area of the display panel2O3Or ZrO; the metal layer in the normal display area is reserved; the metal layer is made of one or more of silver, magnesium, aluminum, platinum, palladium, gold, nickel, neodymium, iridium, chromium or copper.
2. The display panel according to claim 1, wherein a material of the first transparent electrode and the second transparent electrode is one or more of indium tin oxide, indium zinc oxide, or indium oxide.
3. The display panel according to claim 1, wherein the organic light-emitting device further comprises an organic light-emitting layer and a cathode which are sequentially stacked over the anode.
4. The display panel according to claim 3, wherein the cathode is a transparent electrode; the cathode is formed by mixing one or more of indium tin oxide, indium zinc oxide, zinc oxide and indium oxide.
5. The display panel according to claim 3, wherein the cathode is a metal electrode; the metal electrode material is one or more of aluminum, silver or lithium.
6. The display panel of claim 3, wherein the organic light emitting device further comprises at least one organic layer, and the organic layer is a hole injection layer, a hole transport layer, an electron injection layer, or an electron transport layer.
7. A display device comprising the display panel of any one of claims 1-6 and a camera assembly having a camera corresponding to the transparent display area of the display panel.
8. The display device of claim 7, wherein the transparent display area is the same area as the cross-sectional area of the camera.
CN201910349407.8A 2019-04-28 2019-04-28 Display panel and display device Active CN110148611B (en)

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CN201910349407.8A CN110148611B (en) 2019-04-28 2019-04-28 Display panel and display device
PCT/CN2019/106624 WO2020220568A1 (en) 2019-04-28 2019-09-19 Display panel and display device

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CN110148611B (en) * 2019-04-28 2021-08-03 武汉华星光电半导体显示技术有限公司 Display panel and display device
CN110444581A (en) * 2019-08-26 2019-11-12 Oppo广东移动通信有限公司 A kind of display screen structure and electronic equipment
CN110619818B (en) * 2019-08-27 2021-04-27 武汉华星光电半导体显示技术有限公司 Display panel and manufacturing method thereof
CN110783394A (en) * 2019-11-28 2020-02-11 昆山国显光电有限公司 Light-transmitting display panel, display panel and display device
CN110942041B (en) 2019-11-29 2023-11-28 京东方科技集团股份有限公司 Display substrate, manufacturing method thereof and display device
CN111584740B (en) * 2020-05-08 2022-08-23 武汉华星光电半导体显示技术有限公司 Flexible substrate, preparation method thereof and OLED display panel
CN111755623B (en) * 2020-06-17 2022-07-12 武汉华星光电半导体显示技术有限公司 Display panel for under-screen camera and manufacturing method thereof
CN111863895A (en) * 2020-07-16 2020-10-30 武汉华星光电半导体显示技术有限公司 Foldable display screen
CN114122277A (en) * 2020-08-28 2022-03-01 北京小米移动软件有限公司 Display panel, display screen and terminal
CN112271195A (en) * 2020-10-22 2021-01-26 Oppo广东移动通信有限公司 Light-emitting element, preparation method thereof, display screen and electronic device
CN113690384A (en) * 2021-08-10 2021-11-23 武汉华星光电半导体显示技术有限公司 Display panel and display device
CN113963624B (en) * 2021-10-19 2024-01-30 京东方科技集团股份有限公司 Display panel and display device

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