WO2020200168A1

WO2020200168A1 - Amoled display screen, display device and mobile terminal

Info

Publication number: WO2020200168A1
Application number: PCT/CN2020/082076
Authority: WO
Inventors: 文亮; 李冠恒
Original assignee: 维沃移动通信有限公司
Priority date: 2019-04-03
Filing date: 2020-03-30
Publication date: 2020-10-08
Also published as: CN109950290B; CN109950290A

Abstract

Provided are an AMOLED display screen, a display device and a mobile terminal. The AMOLED display screen comprises a plurality of pixels, wherein at least one pixel is a first pixel (101); the first pixel (101) comprises a first wiring layer and a second wiring layer; the first wiring layer and the second wiring layer are arranged separately; a first electrode wiring (1011) and a first electrode sheet are formed on the first wiring layer; a second electrode wiring (1012) and a second electrode sheet are formed on the second wiring layer; the first electrode sheet and the second electrode sheet at least partially overlap to form a first storage capacitor (1013); and at least one of the first electrode wiring (1011), the second electrode wiring (1012) and the first storage capacitor (1013) is made of a light-transmitting conductive material.

Description

AMOLED displays, display equipment and mobile terminals

Cross references to related applications

This application claims the priority of Chinese Patent Application No. 201910266309.8 filed in China on April 3, 2019, the entire content of which is incorporated herein by reference.

Technical field

The present disclosure relates to the field of display technology, and in particular to an AMOLED display screen, a display device and a mobile terminal.

Background technique

With the development of communication technology, in order to improve the visual effect of the display screen of the mobile terminal, the current mobile terminal such as a mobile phone has developed to a stage of full screen. The display interface of a full-screen mobile phone is completely covered by the display screen, and components such as photosensitive elements or light sources are designed under the screen. As shown in Fig. 1, the pixel structure of an active matrix organic light emitting diode or an active matrix organic light emitting diode (AMOLED) display screen in the related art specifically includes: a glass substrate 1 , Buffer layer 2, polysilicon layer 3, first gate insulating layer 4, gate1 wiring 5, second gate insulating layer 6, gate2 wiring 7, interlayer insulating layer 8, M2 source and drain wiring layer 9, The PLN planarization layer 10, the anode 11, the first electrode 12 of the storage capacitor, and the second electrode 13 of the storage capacitor. The metal material molybdenum Mo is generally used to form the gate1 wiring, the gate2 wiring layer and the storage capacitor corresponding to each pixel. Due to the poor light transmission performance of Mo metal materials, the light transmission requirements of components such as photosensitive elements or light sources cannot be met, and components such as photosensitive elements or light-emitting elements cannot be integrated under the screen, which is not conducive to the overall structural layout.

Summary of the invention

The embodiments of the present disclosure provide an AMOLED display screen and a mobile terminal for a display device to solve the problem that the display screen cannot meet the light transmittance requirement, which causes the photosensitive element or the light emitting element and other components cannot be integrated under the screen, which is not conducive to the overall structure layout.

In order to solve the above technical problems, the present disclosure is implemented as follows:

In a first aspect, embodiments of the present disclosure provide an AMOLED display screen, including a plurality of pixels, at least one of which is a first pixel, and the first pixel includes a first wiring layer and a second wiring layer. The first wiring layer and the second wiring layer are arranged separately, a first electrode wiring and a first electrode sheet are formed on the first wiring layer, and a second electrode wiring is formed on the second wiring layer And a second electrode sheet, the first electrode sheet and the second electrode sheet at least partially overlap to form a first storage capacitor, and at least one of the first electrode trace, the second electrode trace, and the first storage capacitor The item is made of light-transmitting conductive material.

In a second aspect, an embodiment of the present disclosure provides a display device including the above-mentioned AMOLED display screen.

In a third aspect, an embodiment of the present disclosure provides a mobile terminal including a display screen and a photosensitive element. The display screen is the above-mentioned AMOLED display screen, the photosensitive element is arranged below the AMOLED display screen, and the AMOLED display screen corresponds to The pixels at the position of the photosensitive element are all the first pixels.

In a fourth aspect, an embodiment of the present disclosure provides a mobile terminal, including a display screen and a light-emitting element, the display screen is the above-mentioned AMOLED display screen, the light-emitting element is disposed under the AMOLED display screen, and the AMOLED display screen The pixels corresponding to the position of the light-emitting element are all the first pixels.

In this embodiment, since at least one of the first electrode wiring, the second electrode wiring and the first storage capacitor in the first pixel is made of a light-transmitting conductive material, the light transmission of the first pixel area can be improved. degree. Therefore, the light transmission requirements of components such as photosensitive elements or light sources can be met, and components such as photosensitive elements and light-emitting elements can be integrated under the screen, which is beneficial to the overall structure layout.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present disclosure more clearly, the following will briefly introduce the drawings needed in the embodiments of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative labor, other drawings can be obtained from these drawings.

Figure 1 is a schematic diagram of the pixel structure of a traditional AMOLED display screen;

Figure 2 shows the layout of polysilicon pixels;

Figure 3 shows the pixel layout of gate1;

Figure 4 is a pixel layout of AMOLED pixel unit used to form gate2 gate and pixel circuit storage capacitor;

FIG. 5 is a pixel layout of an AMOLED pixel unit with openings in an interlayer insulating layer;

6 is a schematic diagram of a pixel distribution structure in an AMOLED display screen provided by an embodiment of the disclosure;

FIG. 7 is one of the connection structure diagrams of the first pixel and the second pixel in the AMOLED display screen provided by an embodiment of the disclosure;

8 is a schematic cross-sectional view of the connection structure of the first pixel and the second pixel in the AMOLED display screen provided by an embodiment of the disclosure;

9 is the second diagram of the connection structure of the first pixel and the second pixel in the AMOLED display screen provided by an embodiment of the disclosure;

FIG. 10 is the third diagram of the connection structure of the first pixel and the second pixel in the AMOLED display screen provided by an embodiment of the disclosure.

detailed description

In order to explain the technical solutions of the embodiments of the present disclosure more clearly, the following will briefly introduce the drawings that need to be used in the embodiments of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative labor, other drawings can be obtained from these drawings.

In order to facilitate understanding, some content involved in the embodiments of the present disclosure is described below:

Some mobile terminals in related technologies are designed for non-full screen. For example, in non-full screen mobile phones, the cameras and LED lights on the mobile phones are all set outside the screen. In order to further meet the needs of large screens, mobile phone screens have gradually entered the era of full screens from non-full screens.

In a full-screen mobile phone, the full-screen occupies most of the front surface of the mobile phone, and the light-emitting elements such as the camera and LED lights on the mobile phone are placed under the screen. The light emitted by the light below the screen (light of various bands including visible light) needs to be emitted through the screen, and the outside light needs to pass through the screen to be received by photosensitive elements such as cameras, photosensitive sensors, or infrared sensors. Light includes visible light, infrared light, X-ray, etc. The light needs to pass through AMOLED pixels, so the higher the light transmittance of the AMOLED display, the better. AMOLED pixel design includes LTPS TFT pixel drive circuit part, and OLED light-emitting diode part. The main paths for light to pass are: 1. Pass through the gap area of the pixel where there is no metal trace to shield the light; 2. The organic light emitting diode has a certain light transmittance and penetrates the light emitting diode area.

In related technologies, the AMOLED screen pixel design and manufacturing process mainly have the following steps:

1. The buffer layer made of SiOx is made on glass or flexible polyimide PI material, the thickness is about 300nm. After that, an amorphous silicon layer with a thickness of about 50 nm is formed on the buffer layer by chemical vapor deposition, and a polysilicon layer is formed by laser annealing. After that, the patterning process flow of photolithography, etching, and de-glue is completed. The main steps are: coating photoresist on the polysilicon layer, exposing and developing using the mask of the polysilicon pixel layout design of Figure 2 to form the pattern of the pixel layout design; Plasma etching is used to form a polysilicon pattern, and then the photoresist is removed to form the polysilicon pattern designed in FIG. 2.

2. Chemical vapor deposition of a SiOx film with a thickness of about 60 nm and a SiNx film with a thickness of about 60 nm on the polysilicon pattern as a gate insulating layer. Then physical vapor deposition of a Mo metal layer with a thickness of about 200nm, using the mask designed by the pixel layout of the gate1 wiring layer in Figure 3, completing the gate1 gate patterning process using photolithography, etching, and de-glueing processes, and fabricating the gate1 gate and The first electrode of the storage capacitor of the pixel circuit.

3. On the basis of the above, deposit SiNx with a thickness of about 130nm as the gate insulating layer 2, and then physical vapor deposit a Mo metal layer with a thickness of about 250nm as the gate2 wiring layer, and complete the pattern by photolithography, development, etching, and de-glue process The process. Fabricate the gate 2 of gate2 and the second electrode of the storage capacitor of the pixel circuit, as shown in Figure 4.

4. Chemical vapor deposition of SiN with a thickness of about 250nm and SiOx with a thickness of about 300nm as the interlayer insulating layer. Using the design shown in Figure 5, the patterning process of opening the interlayer insulating layer is completed to form connection holes.

5. Physical vapor deposition of 50nm Ti, 500nm thick Al, 100nm thick Ti M2 metal layer, using the pattern designed by the layout, complete the patterning process of the source and drain electrode layers, that is, the M2 layer. Form various electrical connections such as data line routing.

6. Using the pattern mask designed by the layout, the photolithography technology is used to form via holes on the planarized organic film layer with a thickness of about 1.5 μm made by the coating process for electrical connection.

7. Physical vapor deposition of about 50nm thick ITO film, 15nm thick Ag film, and 50nm thick ITO film, and complete the patterning process to make anode, which is used as the positive electrode of organic light emitting diode.

8. Coating a transparent organic film layer with a thickness of about 1.5μm as the pixel definition layer to complete the patterning process. The part removed from the pixel definition layer and the exposed anode is the effective area for current injection from the positive electrode of the organic light emitting diode.

9. Coating a transparent organic film layer with a thickness of about 1.5μm as the pixel definition layer to complete the patterning process. The part removed from the pixel definition layer and the exposed anode is the effective area for current injection from the positive electrode of the organic light emitting diode.

10. The mask of the metal grid made according to the layout design, using the thermal evaporation method, the OLED organic layer is evaporated on the exposed anode of the pixel definition layer.

11. Using thermal evaporation, the metal Mg, Ag alloy is evaporated onto the organic layer as a cathode.

The AMOLED screen manufactured through the design and process of the above related technologies will have the following problems:

1. When light including visible light passes through the screen from above, for example, when it needs to be received by the camera under the screen, the metal in the AMOLED pixel will block the light, causing the camera to not receive enough light.

2. When the LED light under the screen needs to penetrate the screen, the metal layer will also block the light from penetrating the screen.

Based on the above-mentioned problems, the present disclosure uses light-transmitting conductive materials to make connection lines, and designs a new pixel with high transmittance. New pixels with high transmittance are set in areas that require high transmittance, and traditional pixels are set in other areas. Thus, without affecting the overall display effect, applications such as under-screen cameras can be achieved.

The AMOLED display screen of the embodiment of the present disclosure is described in detail below.

Referring to FIGS. 6 to 10, embodiments of the present disclosure provide an AMOLED display screen, which includes a plurality of pixels, at least one of which is a first pixel 101, and the first pixel 101 includes a first wiring layer and a second wiring layer. Two wiring layers, the first wiring layer and the second wiring layer are arranged separately, a first electrode wiring 1011 and a first electrode sheet are formed on the first wiring layer, the second wiring layer A second electrode trace 1012 and a second electrode sheet are formed thereon. The first electrode sheet and the second electrode sheet at least partially overlap to form a first storage capacitor 1013. The first electrode trace 1011 and the second electrode At least one of the wiring 1012 and the first storage capacitor 1013 is made of a transparent conductive material.

The AMOLED display screen provided by the embodiments of the present disclosure includes a plurality of pixels, and the plurality of pixels may be arranged in a matrix, and part or all of the pixels of the AMOLED display screen may be designed as first pixels. The first electrode wiring 1011 is the gate1 wiring in the first pixel; the second electrode wiring 1012 is the gate2 wiring in the first pixel.

It should be noted that the specific type of the above-mentioned transparent conductive material can be set according to actual needs. For example, in an optional embodiment, the above-mentioned transparent conductive material may be a transparent indium tin oxide ITO conductive film.

In this embodiment, the above-mentioned first pixel may include a variety of design solutions, which will be described in detail through four specific examples below:

Solution 1: As shown in Figure 7, the first electrode trace 1011 is made of light-transmitting conductive material, and the second electrode trace 1012 and the first storage capacitor 1013 are made of the metallic material molybdenum Mo; The light transmittance of the electrode wiring 1011 increases the light transmittance of the first pixel 101.

Solution 2: As shown in Figure 9, the second electrode wiring 1012 is made of light-transmitting conductive material, and the first electrode wiring 1011 and the first storage capacitor 1013 are made of the metallic material molybdenum Mo; The light transmittance of the electrode wiring 1012 increases the light transmittance of the first pixel 101.

Scheme 3, as shown in FIG. 10, the first storage capacitor 1013 is made of a light-transmitting conductive material, and the first electrode wiring 1011 and the second electrode wiring 1012 are made of the metallic material molybdenum Mo. In this way, since the light transmittance of the first storage capacitor 1013 is enhanced, the light transmittance of the first pixel 101 is increased.

Solution 4, the first electrode wiring 1011, the second electrode wiring 1012, and the first storage capacitor 1013 are all made of light-transmitting conductive material, which can maximize the light transmittance of the first pixel 101.

In this embodiment, since at least one of the first electrode wiring 1011, the second electrode wiring 1012 and the first storage capacitor 1013 in the first pixel is made of light-transmitting conductive material, the area of the first pixel can be increased. Light transmittance. Therefore, the light transmission requirements of components such as photosensitive elements or light sources can be met, and components such as photosensitive elements and light-emitting elements can be integrated under the screen, which is beneficial to the overall structure layout.

Further, based on the above-mentioned embodiment, in this embodiment, at least one of the above-mentioned multiple pixels is the second pixel 102, and the second pixel 102 includes a third wiring layer and a fourth wiring layer. A third electrode trace 1021 and a third electrode sheet are formed on the wiring layer, and a fourth electrode trace 1022 and a fourth electrode sheet are formed on the fourth wiring layer. The third electrode sheet and the first electrode sheet are The four electrode sheets at least partially overlap to form a second storage capacitor 1023; the first electrode wiring 1011 and the third electrode wiring 1021 are located in the same layer, and the first electrode wiring 1011 and the third electrode wiring 1021 Conductive connection; the second electrode trace 1012 and the fourth electrode trace 1022 are located in the same layer, and the second electrode trace 1012 and the fourth electrode trace 1022 are conductively connected.

It should be noted that the materials used for the third electrode wiring 1021, the fourth electrode wiring 1022, and the second storage capacitor 1023 can be set according to actual needs. For example, in this embodiment, the third electrode wiring The wire 1021, the fourth electrode wire 1022, and the second storage capacitor 1023 may all be made of the metallic material molybdenum Mo.

The third electrode wiring 1021 is a gate1 wiring in the second pixel; the fourth electrode wiring 1032 is a gate2 wiring in the second pixel.

The conductive connection between the first electrode trace 1011 and the third electrode trace 1021 can be set according to actual needs. For example, in this embodiment, the first electrode trace 1011 can be connected to the third electrode trace 1021. 1021 partially overlaps, and the first electrode trace 1011 and the third electrode trace 1021 are conductively connected at the overlapping portion.

In an alternative embodiment, the third electrode trace 1021 can be made first. The specific process is: first make the MO metal layer, and then lithography, etch, and de-glue to form the metal trace of gate1 (that is, the third electrode trace ); Then a thin film of ITO is formed, and finally ITO traces are formed by photolithography, etching, and de-glueing (that is, the first electrode traces mentioned above), and the ITO traces overlap the Mo traces to form a conductive connection.

In this embodiment, since the first electrode wiring 1011 and the third electrode wiring 1021 are partially overlapped, and the first electrode wiring 1011 and the third electrode wiring 1021 are conductively connected at the overlapping portion, such The first electrode wiring 1011 can be made directly after the third electrode wiring 1021 is made, and the first electrode wiring 1011 is overlapped with the third electrode wiring 1021 to achieve conductive connection. This makes the manufacturing process simple and reduces the AMOLED display The difficulty of manufacturing the screen.

In this embodiment, since the first pixel 101 and the second pixel 102 exist on the AMOLED display screen at the same time, it is possible to avoid the problem of using ITO materials on the screen, which leads to excessive wiring resistance of gate1 and poor display.

Similarly, the second electrode trace 1012 and the fourth electrode trace 1022 partially overlap, and are electrically connected at the overlapping portion. Specifically, the manufacturing process of the second electrode wiring 1012 and the fourth electrode wiring 1022 can refer to the manufacturing process of the first electrode wiring 1011 and the third electrode wiring 1021, which will not be repeated here.

In this embodiment, since the first pixel 101 and the second pixel 102 exist on the AMOLED display screen at the same time, it is possible to avoid the problem of using ITO materials on the screen, which leads to excessive wiring resistance of gate2 and poor display.

In the above solution 3, the first storage capacitor 1013 is set as an ITO material, and specifically the gate1 electrode and/or gate2 electrode of the first storage capacitor are set as an ITO material at the same time. Since the area of the first storage capacitor 1013 is relatively large, making the first storage capacitor 1013 a transparent electrode made of ITO material can greatly increase the light transmittance of the first pixel 101.

It should be noted that the number of the first pixels 101 and the second pixels 102 can be set according to actual needs. For example, in this embodiment, the number of the first pixels 101 is smaller than the number of the electrodes of the second pixel 102.

In this embodiment, the pixels in the small area can be set as the first pixel 101, and the remaining pixels can be set as the second pixel 102. As shown in FIG. 6, the 4 pixels in the area A are the first pixel 101, and the remaining pixels It is the second pixel 102. This ensures that the first electrode trace 1011 and/or the second electrode trace 1012 and/or the first storage capacitor 1013 of a small part of the pixels are made of ITO material, so that a small part of the area uses high-transmittance pixels, which is very important for the overall screen The display effect is small, and the light transmittance of the device screen area under the screen is greatly improved.

Further, based on the above-mentioned embodiment, in this embodiment, the above-mentioned AMOLED display screen further includes source-drain wiring, and the source-drain wiring is made of the transparent conductive material.

It should be noted that the various optional implementation manners introduced in the embodiments of the present disclosure can be implemented in combination with each other or can be implemented separately, and the embodiments of the present disclosure are not limited.

The embodiment of the present disclosure also provides a display device, which includes an AMOLED display screen. The AMOLED display screen is the AMOLED display screen in the foregoing embodiment, and its structure can refer to the AMOLED display screen in the foregoing embodiment. Since the AMOLED display screen in the above-mentioned embodiment is adopted, the display device provided in the embodiment of the present disclosure also has all the beneficial effects of the AMOLED display screen in the above-mentioned embodiment, which will not be repeated here.

The embodiment of the present disclosure also provides a mobile terminal, the mobile terminal includes an AMOLED display screen and a photosensitive element, the photosensitive element is arranged under the AMOLED display screen, the AMOLED display screen corresponds to the pixels of the photosensitive element position The first pixel. The AMOLED display screen is the AMOLED display screen in the foregoing embodiment, and its structure can refer to the AMOLED display screen in the foregoing embodiment. Since the AMOLED display screen in the above-mentioned embodiment is adopted, the mobile terminal provided by the embodiment of the present disclosure sets the pixel corresponding to the position of the photosensitive element as the first pixel, so that the light transmittance requirement of the photosensitive element can be met, so that the photosensitive element can be Integration into the screen is conducive to the overall structure layout.

It can be understood that the above-mentioned photosensitive element may be a camera, a photosensitive sensor or an infrared sensor.

The embodiment of the present disclosure also provides a mobile terminal, the mobile terminal includes an AMOLED display screen and a light-emitting element, the light-emitting element is arranged under the AMOLED display screen, the AMOLED display screen corresponds to the pixels of the light-emitting element position The first pixel. The AMOLED display screen is the AMOLED display screen in the foregoing embodiment, and its structure can refer to the AMOLED display screen in the foregoing embodiment. Since the AMOLED display screen in the above-mentioned embodiment is adopted, the mobile terminal provided by the embodiment of the present disclosure sets the pixel corresponding to the position of the light-emitting element as the first pixel, so that the light-transmitting requirement of the light-emitting element can be met, so that the light-emitting element can Integration into the screen is conducive to the overall structure layout.

It should be noted that the mobile terminals in the embodiments of the present disclosure include, but are not limited to, mobile phones, tablet computers, notebook computers, palmtop computers, vehicle-mounted terminals, wearable devices, and pedometers.

The embodiments of the present disclosure are described above with reference to the accompanying drawings, but the present disclosure is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only illustrative and not restrictive. Those of ordinary skill in the art are Under the enlightenment of the present disclosure, many forms can be made without departing from the purpose of the present disclosure and the scope of protection of the claims, all of which fall within the protection of the present disclosure.

Claims

An AMOLED display screen includes a plurality of pixels, at least one of which is a first pixel, the first pixel includes a first wiring layer and a second wiring layer, the first wiring layer and the second wiring layer Layer separation, the first wiring layer is formed with a first electrode wiring and a first electrode sheet, the second wiring layer is formed with a second electrode wiring and a second electrode sheet, the first The electrode sheet and the second electrode sheet at least partially overlap to form a first storage capacitor, and at least one of the first electrode trace, the second electrode trace, and the first storage capacitor is made of a light-transmitting conductive material.
The AMOLED display screen of claim 1, wherein the light-transmitting conductive material is a transparent indium tin oxide ITO conductive film.
The AMOLED display screen of claim 1, wherein at least one pixel of the plurality of pixels is a second pixel, and the second pixel includes a third wiring layer and a fourth wiring layer, and the third wiring layer A third electrode trace and a third electrode sheet are formed on the wire layer, a fourth electrode trace and a fourth electrode sheet are formed on the fourth wiring layer, the third electrode sheet and the fourth electrode sheet At least partially overlapped to form a second storage capacitor; the first electrode wiring and the third electrode wiring are located on the same layer, and the first electrode wiring and the third electrode wiring are conductively connected; the second electrode The wiring and the fourth electrode wiring are located on the same layer, and the second electrode wiring and the fourth electrode wiring are conductively connected.
4. The AMOLED display screen of claim 3, wherein the third electrode wiring, the fourth electrode wiring and the second storage capacitor are all made of molybdenum, a metal material.
The AMOLED display screen according to claim 3, wherein the first electrode trace and the third electrode trace partially overlap, and the first electrode trace and the third electrode trace are in the overlapping portion Electric connection.
The AMOLED display screen according to claim 3, wherein the second electrode trace and the fourth electrode trace partially overlap, and the second electrode trace and the fourth electrode trace are in the overlapping position Electric connection.
The AMOLED display screen according to any one of claims 1 to 6, further comprising source and drain wirings, and the source and drain wirings are made of the transparent conductive material.
A display device comprising the AMOLED display screen according to any one of claims 1-7.
A mobile terminal, comprising a display screen and a photosensitive element, the display screen being the AMOLED display screen according to any one of claims 1-7, the photosensitive element being arranged below the AMOLED display screen, and the AMOLED The pixels at the position of the display screen corresponding to the photosensitive element are all the first pixels.
The mobile terminal according to claim 9, wherein the photosensitive element is a camera, a photosensitive sensor or an infrared sensor.
A mobile terminal, comprising a display screen and a light-emitting element, the display screen is the AMOLED display screen according to any one of claims 1-7, the light-emitting element is arranged under the AMOLED display screen, and the AMOLED The pixels at the position of the display screen corresponding to the light-emitting element are all the first pixels.