WO2020220568A1

WO2020220568A1 - Display panel and display device

Info

Publication number: WO2020220568A1
Application number: PCT/CN2019/106624
Authority: WO
Inventors: 倪晶; 简庆宏
Original assignee: 武汉华星光电半导体显示技术有限公司
Priority date: 2019-04-28
Filing date: 2019-09-19
Publication date: 2020-11-05
Also published as: CN110148611B; CN110148611A

Abstract

A display panel (10) and a display device. The display panel (10) has a transparent display region (10a) and a conventional display region (10b) surrounding the transparent display region (10a). At least one organic light-emitting device (300) is provided in the transparent display region (10a). The organic light-emitting device (300) comprises an anode (310). The anode (310) comprises 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). The metal layer (312) is provided with a hollow region (3121). The hollow region (3121) is filled with a support column (3122) made of a material having high light transmittance.

Description

Display panel and display device

Technical field

This application relates to the field of display technology, and in particular to a display panel and a display device.

Background technique

Organic Light-Emitting Diode (OLED) has the advantages of high brightness, rich colors, low driving voltage, fast response speed, low power consumption, good shock resistance, wide viewing angle range, and thin thickness. Therefore, OLED has huge development potential in solid-state lighting and flat panel displays, and OLED panels have become the choice of more and more manufacturers.

With the development of science and technology, people have higher and higher requirements for the aesthetics and lightness of mobile phones. Full-screen mobile phones with high-value, high-tech and strong visual impact have begun to popularize the mobile phone market and become the pursuit of many manufacturers. However, due to the limitations of the existing front-facing camera settings and installation technology, the real screen-to-body ratio of most mobile phones on the market is uneven. Among them, the under-screen camera products, due to the relatively high screen occupancy and the low impact of the camera on the visual image, have become the most promising display device designs at present.

technical problem

The under-screen camera display device means that the camera is arranged on the back of the substrate of the display panel, and the corresponding ambient light incident path is formed on the display panel to ensure that the ambient light can enter the camera through the display panel. As the ambient light passes through the display panel, the anode metal layer has a strong reflection effect, which will reflect a large amount of the loss of the incident ambient light, resulting in a greatly reduced ambient light entering the camera and ultimately affecting the imaging effect.

Therefore, there is an urgent need to provide a display panel and a display device whose anode can avoid the reflection of ambient light and improve the light-harvesting ability of the camera to solve the above-mentioned problems.

Technical solutions

The purpose of the present application is to solve the above-mentioned shortcomings in the prior art, and provide a display panel with higher anode light transmittance, and a display device using the display panel.

In order to achieve the above objectives, the application adopts the following technical solutions.

A display panel has 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 includes an anode, and the anode includes A first transparent electrode, a second transparent electrode, and a metal layer sandwiched between the first transparent electrode and the second transparent electrode, wherein a hollow area is provided on the metal layer, and the hollow The area is filled with a support column formed of a high light transmittance material, and the high light transmittance material is one or more of graphene, Al2O3 or ZrO, and the material of the metal layer is silver, magnesium, One or more of 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, or indium oxide.

Further, the organic light-emitting device further includes 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 includes at least one organic layer, and the organic layer may be a hole injection layer, a hole transport layer, an electron injection layer or an electron transport layer.

Further, the area of the transparent display area is the same as the cross-sectional area of the camera.

A display panel has 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 includes an anode, and the anode includes A first transparent electrode, a second transparent electrode, and a metal layer sandwiched between the first transparent electrode and the second transparent electrode, wherein a hollow area is provided on the metal layer.

Further, the hollow area is filled with a support column formed of a material with high light transmittance, and the material with high light transmittance is one or more of graphene, Al2O3 or 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.

The present application also provides a display device. The display device includes a display panel and a camera assembly. The display panel has a transparent display area and a regular display area surrounding the transparent display area. At least one organic light-emitting device is provided. The organic light-emitting device includes an anode, and the anode includes a first transparent electrode, a second transparent electrode and sandwiched between the first transparent electrode and the second transparent electrode. A metal layer in between, wherein a hollow area is provided on the metal layer; the camera assembly has a camera, and the camera corresponds to the transparent display area of the display panel.

Beneficial effect

Organic light-emitting devices are arranged in the transparent display area of the display panel of the present application, so the transparent display area of the display panel has the functions of normal display and ambient light transmission; the anode in the transparent display area of the display panel of the present application The metal layer is provided with a hollow area, which can reduce the reflection of the metal layer to ambient light and improve the light transmittance of the ambient light; the hollow area of the display panel described in the present application is filled with a support column formed of a material with high light transmittance, It can transmit ambient light and prevent the second transparent electrode from sinking; the display panel of the present application has a simple and stable structure, and has better display and shooting effects. The display device described in the present application can realize the functions of screen display and under-screen camera at the same time, which helps to realize a full screen.

Description of the drawings

FIG. 1 is a schematic diagram of the structure of the display panel of the present application.

FIG. 2 is a cross-sectional view of an embodiment of the display device according to the present application.

Fig. 3 is a cross-sectional view of another embodiment of the display device according to the present application.

Embodiments of the invention

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of this application.

As shown in FIG. 1, the present application provides a display panel 10 having a transparent display area 10a and a conventional display area 10b surrounding the transparent display area 10a.

As shown in FIGS. 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 stacked on the substrate 100 in sequence. At least one organic light emitting device 300 is arranged in the transparent display area 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 Figure 2 and Figure 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 the metal layer A hollow area 3121 is formed on 312. When ambient light penetrates from the display panel 10 to the anode 310, the ambient light can directly pass through the hollow area 3121, which reduces the reflection of the metal layer 312 on the ambient light and increases the The light transmittance of the transparent display area 10a of the display panel 10.

As shown in FIGS. 2 and 3, when a camera assembly 20 is arranged overlappingly below the display panel 10, and the 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 the ambient light incident from the transparent display area 10 a of the display panel 10. By providing the hollow area 3121 on the metal layer 312, the anode 310 can achieve high transmittance to ambient light, thereby improving the light capturing ability and imaging effect of the camera assembly 20.

As shown in Figure 3. The hollow area 3121 is filled with a supporting column 3122 formed of a material with high light transmittance. The supporting column 3122 can support the second transparent electrode 313 and prevent the second transparent electrode 313 from being recessed in the hollow area 3121. At the same time, the supporting column 3122 can transmit ambient light and concentrate the ambient light in the supporting column 3122 during the transmission process to prevent the ambient light from being scattered and lost, thereby further increasing the environment of the camera assembly 20 The amount of light incident.

During specific implementation, the first transparent electrode 311 and the second transparent electrode 313 are formed of transparent conductive oxide materials such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium oxide (In2O3), etc. . The above-mentioned transparent conductive oxide not only has good light transmittance and conductivity, but also has a high work function, which is easy to achieve the best energy level matching with organic materials such as hole injection layer (HIM) to reduce the organic light emission. The driving voltage of the device 300 improves the light-emitting performance. In this embodiment, both the first transparent electrode 311 and the second transparent electrode 313 are ITO electrodes. In the actual manufacturing process, the ITO transparent electrode is manufactured by PVD sputter sputtering process.

The metal layer 312 can be made of silver (Ag), magnesium (Mg), aluminum (Al), platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir) , One or more of chromium (Cr) is mixed to form. In this embodiment, the metal layer 312 is made of Ag. In the specific manufacturing process, on the first transparent electrode 311, PVD sputter is used for sputtering to obtain a complete Ag film, and then local exposure, development and etching are performed to obtain a partially etched metal Ag film to form the hollow area 3121.

The high light transmittance material includes a light-transmitting conductive material and a light-transmitting non-conductive material. The transparent conductive material can be graphene, and the transparent non-conductive material can be Al2O3 or ZrO. In the actual manufacturing process, the graphene is prepared by evaporation, while Al2O3 or ZrO is prepared by ALD or PVD.

The organic light emitting layer 320 is coated and disposed on the second transparent electrode 313 of the anode 310. The organic light-emitting layer 320 is composed of layers of light-emitting materials. The luminescent material layer includes one or more of a red light luminescent material layer, a green light material layer, a blue light material layer or a white light luminescent material layer. Common luminescent materials include small molecule luminescent materials, polymer luminescent materials, and dendrimer luminescent materials. Generally speaking, a vacuum evaporation process is often used for small-molecule luminescent materials, and a spin coating or inkjet process is mostly used for polymer luminescent materials. The above-mentioned process can be selected for dendrimer luminescent materials according to their molecular weight.

In 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 side of the organic light emitting layer 320 opposite to the anode 310. By applying a voltage between the anode 310 and the cathode 330, the organic light-emitting layer 320 can emit light through the principle of electroluminescence. Wherein, the self-luminous light of the organic light emitting layer 320 passes through the cathode 330. In specific implementation, the cathode 330 can be made of transparent electrode materials such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO) or indium oxide (In2O3), or aluminum (Al), silver (Ag) or Made of metal electrode materials such as lithium (Li).

The substrate 100 is transparent or has a relatively high light transmittance in the visible light waveband. Specifically, the substrate 100 may be made of glass materials, quartz, metal materials, or materials including polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or polyimide. Suitable materials are formed from plastic materials. In this embodiment, in order to improve the bending resistance and 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 specific implementation, before forming the TFT, a buffer layer such as (Buffer) may be formed on the entire surface of the substrate 100 or by patterning. Layer, BL) or another layer of the bonding layer.

Wherein, the buffer layer may have suitable materials including PET, PEN, polyacrylate, and/or polyimide, and form a layered structure in the form of a single layer or a multilayer stack. The buffer layer may also be formed of silicon oxide or silicon nitride, or may include a composite layer of organic materials and/or inorganic materials.

The cross-sectional structure of the TFT includes an active layer, a first insulating layer, a gate, a gate insulating layer, a drain, a source, and an interlayer insulating layer.

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 composed of aluminum (Al), platinum (Pt), palladium (Pd), silver (Ag), magnesium (Mg), gold (Au), nickel (Ni), neodymium (Nd), At least one of iridium (Ir), chromium (Cr), lithium (Li), calcium (Ca), molybdenum (Mo), titanium (Ti), tungsten (W), copper (Cu) or other suitable alloys The single material layer or composite material layer is formed.

As shown in FIG. 2, a thin film encapsulation layer 400 must be provided on the side of the cathode 330 away from the anode 310 to prevent the organic materials and metal electrodes of the display panel 10 from being oxidized or crystallized when encountering moisture and oxygen. Physical and chemical changes, thereby failing.

The thin film encapsulation layer 400 includes inorganic thin film layers and organic thin film layers alternately arranged. The material of the inorganic film layer is silicon oxide or silicon nitride, and the material of the organic film layer is colorless and transparent polyimide, polyurethane, polyethylene terephthalate or polyethylene naphthalate Alcohol ester. In the specific manufacturing process of the display device, the inorganic thin film layer is deposited and formed by ALD or PECVD, and the organic thin film layer is formed by inkjet printing (IJP) or spin coating (Spin Coating).

In this embodiment, the thin-film encapsulation layer 400 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 that is gradually away from the anode 310.

As shown in FIGS. 2 and 3, the present application also provides a display device, the display device includes the above-mentioned display panel 10 and a camera assembly 20 that are stacked, wherein the camera assembly 20 has a camera, and the The camera corresponds to the transparent display area 10a of the display panel 10.

In the display device provided by the embodiment of the present application, 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, that is, its diffuse reflection light signal, 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 are incident on the camera of the camera assembly 20 to obtain a photographed 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 emits light; the light from the organic light-emitting layer 320 is emitted through the cathode 330 and the encapsulation layer 400 for display .

The hollow area 3121 is provided on the metal layer 312 of the transparent display area 10a, so that the ambient light entering the camera assembly 20 through the anode 310 will not be reflected by the metal layer 312, but directly continue to pass through The second transparent electrode 313 and the first transparent electrode 311 are emitted from the substrate 100 and enter the camera assembly 20. As a result, when the camera is used, the ambient light irradiated into the camera can be enhanced, and the imaging quality can be improved.

During specific implementation, the metal layer 312 in the conventional display area 10b of the display panel 100 can still be retained. In other words, the anode 310 in the conventional display area 10b still reflects the self-luminous light of the organic light-emitting layer 320, and it can still increase the amount of light emitted by the cathode 330 in the conventional display area 10b. , The purpose of improving the display effect.

The above are only the preferred embodiments of this application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of this application, several improvements and modifications can be made, and these improvements and modifications should also be considered The protection scope of this application.

Industrial applicability

The subject of this application can be manufactured and used in industry and has industrial applicability.

Claims

A display panel has 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, wherein the organic light-emitting device includes an anode, and The anode includes a first transparent electrode, a second transparent electrode, and a metal layer sandwiched between the first transparent electrode and the second transparent electrode, wherein a hollow area is provided on the metal layer, so The hollow area is filled with a supporting column formed of a material with high light transmittance, and the material with high light transmittance is one or more of graphene, Al2O3 or ZrO, and the material of the metal layer is silver, One or more of magnesium, aluminum, platinum, palladium, gold, nickel, neodymium, iridium, chromium or copper.
The display panel of claim 1, wherein the materials of the first transparent electrode and the second transparent electrode are one or more of indium tin oxide, indium zinc oxide, zinc oxide, or indium oxide.
The display panel of claim 1, wherein the organic light-emitting device further comprises an organic light-emitting layer and a cathode which are sequentially stacked on the anode.
8. The display panel of 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.
8. The display panel of claim 3, wherein the cathode is a metal electrode; and the metal electrode material is one or more of aluminum, silver or lithium.
8. The display panel of claim 3, wherein the organic light emitting device further comprises at least one organic layer, and the organic layer may be a hole injection layer, a hole transport layer, an electron injection layer, or an electron transport layer.
7. The display panel of claim 6, wherein the area of the transparent display area is the same as the cross-sectional area of the camera.
A display panel has 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, wherein the organic light-emitting device includes an anode, and The anode includes a first transparent electrode, a second transparent electrode, and a metal layer sandwiched between the first transparent electrode and the second transparent electrode, wherein a hollow area is provided on the metal layer.
8. The display panel of claim 8, wherein the area of the transparent display area is the same as the cross-sectional area of the camera.
8. The display panel of claim 8, wherein the material of the metal layer is one or more of silver, magnesium, aluminum, platinum, palladium, gold, nickel, neodymium, iridium, chromium, or copper.
8. The display panel of claim 8, wherein 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, or indium oxide.
8. The display panel of claim 8, wherein the organic light-emitting device further comprises an organic light-emitting layer and a cathode which are sequentially stacked and covered on the anode.
The display panel of claim 12, wherein the cathode is a transparent electrode; the cathode is formed by a mixture of one or more of indium tin oxide, indium zinc oxide, zinc oxide, and indium oxide.
13. The display panel of claim 12, wherein the cathode is a metal electrode; and the metal electrode material is one or more of aluminum, silver or lithium.
11. The display panel of claim 12, wherein 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.
A display device, wherein the display device includes a display panel and a camera assembly, the display panel has a transparent display area and a conventional display area surrounding the transparent display area, and the transparent display area is provided with At least one organic light-emitting device, the organic light-emitting device includes an anode, the anode includes a first transparent electrode, a second transparent electrode and sandwiched between the first transparent electrode and the second transparent electrode A metal layer, wherein a hollow area is provided on the metal layer; the camera assembly has a camera, and the camera corresponds to the transparent display area of the display panel.
16. The display device of claim 16, wherein the area of the transparent display area is the same as the cross-sectional area of the camera.