ARRAY SUBSTRATE AND DISPLAY DEVICE

• US 20200134284A1
• Filed: 12/30/2019
• Published: 04/30/2020
• Est. Priority Date: 07/31/2019
• Status: Active Grant

• Current Assignee: Xiamen Tianma Micro-Electronics Co., Ltd.
• Original Assignee: Xiamen Tianma Micro-Electronics Co., Ltd.
• Inventors: LING, Ankai, SHEN, Poping, XIE, Xiuzhen, ZHENG, Lihua, LAN, Xuexin, ZHOU, Lu
• Granted Patent: US 11,263,427 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen
• CPC Class Codes: G06V 40/1318 using electro-optical elements or layers, e.g. electroluminescent sensing
• CPC Class Codes: H01L 27/1461 characterised by the photosensitive area
• CPC Class Codes: H01L 27/14623 Optical shielding
• CPC Class Codes: H01L 27/14678 Contact-type imagers
• CPC Class Codes: H10K 50/813 characterised by their shape
• CPC Class Codes: H10K 50/865 comprising light absorbing layers, e.g. light-blocking layers
• CPC Class Codes: H10K 59/126 Shielding, e.g. light-blocking means over the TFTs
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens
• CPC Class Codes: H10K 59/65 OLEDs integrated with inorganic image sensors

Abstract

Provided are an array substrate and display device. The array substrate includes a base substrate; a fingerprint recognition unit with a light sensing structure; a light blocking layer and an electrode connecting structure arranged at a side of the light sensing structure facing away from the base substrate. The light blocking layer is provided with a collimation hole. A vertical projection of the collimation hole on the base substrate is partially overlapped with a vertical projection of the light sensing structure on the base substrate. An insulation layer is arranged between the electrode connecting structure and the light sensing structure. The insulation layer is provided with an electrode via. The electrode connecting structure is connected to the light sensing structure through the electrode via. The vertical projection of the collimation hole on the base substrate is not overlapped with a vertical projection of the electrode via on the base substrate.

Claims

1. An array substrate, comprising:

a base substrate;

a fingerprint recognition unit with a light sensing structure; and

a light blocking layer and an electrode connecting structure, wherein the light blocking layer and the electrode connecting structure are arranged at a side of the light sensing structure facing away from the base substrate;

wherein the light blocking layer is provided with a collimation hole, wherein a vertical projection of the collimation hole on the base substrate is partially overlapped with a vertical projection of the light sensing structure on the base substrate;

an insulation layer arranged between the electrode connecting structure and the light sensing structure, wherein the insulation layer is provided with an electrode via, and wherein the electrode connecting structure is connected to the light sensing structure through the electrode via; and

wherein the vertical projection of the collimation hole on the base substrate is not overlapped with a vertical projection of the electrode via on the base substrate.

2. The array substrate of claim 1, further comprising a plurality of pixel units, wherein each pixel unit of the plurality of pixel units comprises a pixel electrode and a common electrode;

wherein the electrode connecting structure and one of the pixel electrode and the common electrode are arranged on a same layer and made of a same material.

3. The array substrate of claim 1, further comprising a plurality of pixel units, wherein each pixel unit of the plurality of pixel units comprises a pixel electrode and a common electrode;

wherein the pixel electrode of one or more of the pixel units or the common electrode of one or more of the pixel units is reused as the electrode connecting structure, wherein the electrode connecting structure is configured to provide the pixel electrode or the common electrode with a display drive signal in a display stage, and provide the light sensing structure with an operating voltage signal in a fingerprint recognition stage.

4. The array substrate of claim 1, further comprising:

a plurality of pixel units, wherein each pixel unit of the plurality of pixel units comprises a pixel electrode and a common electrode; and

a touch electrode layer;

wherein the touch electrode layer is arranged at the side of the light sensing structure facing away from the base substrate; and

wherein the electrode connecting structure and the touch electrode layer are arranged on a same layer and made of a same material.

5. The array substrate of claim 1, further comprising:

a plurality of pixel units, wherein each pixel unit of the plurality of pixel units comprises a pixel electrode and a common electrode; and

a touch electrode layer;

wherein the touch electrode layer is arranged at the side of the light sensing structure facing away from the base substrate; and

wherein the touch electrode layer comprises a plurality of touch electrodes, wherein one or more of the touch electrodes are reused as the electrode connecting structure, wherein the electrode connecting structure is configured to provide the touch electrodes with a touch signal in a touch stage and provide the light sensing structure with an operating voltage signal in a fingerprint recognition stage.

6. The array substrate of claim 4, wherein the touch electrode layer is arranged between the pixel electrode and the base substrate, and the touch electrode layer is arranged between the common electrode and the base substrate.

7. The array substrate of claim 5, wherein the touch electrode layer is arranged between the pixel electrode and the base substrate, and the touch electrode layer is arranged between the common electrode and the base substrate.

8. The array substrate of claim 1, further comprising:

a touch electrode layer arranged at the side of the light sensing structure facing away from the base substrate; and

a touch lead electrically connected to the touch electrode layer;

wherein the electrode connecting structure and the touch lead are arranged on a same layer and made of a same material.

9. The array substrate of claim 1, further comprising:

a touch electrode layer arranged at the side of the light sensing structure facing away from the base substrate; and

a touch lead electrically connected to the touch electrode layer;

wherein the touch electrode layer comprises a plurality of touch electrodes, the touch lead comprises a plurality of touch sub-leads, and each of the touch sub-leads is connected to one of the touch electrodes;

wherein one or more touch sub-leads of the plurality of touch sub-leads are reused as the electrode connecting structure, and the electrode connecting structure is configured to provide the touch electrodes with a touch signal in a touch stage and provide the light sensing structure with an operating voltage signal in a fingerprint recognition stage.

10. The array substrate of claim 8, wherein the touch lead is arranged between the touch electrode layer and the base substrate.

11. The array substrate of claim 9, wherein the touch lead is arranged between the touch electrode layer and the base substrate.

12. The array substrate of claim 1, further comprising a plurality of light emitting units arranged at the side of the light sensing structure facing away from the base substrate;

wherein the electrode connecting structure and a cathode of each light emitting unit of the plurality of light emitting units are arranged on a same layer and made of a same material, or the electrode connecting structure and an anode of each light emitting unit of the plurality of light emitting units are arranged on a same layer and made of a same material.

13. The array substrate of claim 1, further comprising a plurality of light emitting units arranged at the side of the light sensing structure facing away from the base substrate;

wherein each light emitting unit of the plurality of light emitting units comprises a cathode, an anode and a light emitting function layer arranged between the cathode and the anode;

wherein the cathode or the anode of one or more of the light emitting units is used as the electrode connecting structure, and the electrode connecting structure is configured to provide the cathode or the anode with a display drive signal in a display stage and provide the light sensing structure with an operating voltage signal in a fingerprint recognition stage.

14. The array substrate of claim 2, wherein a vertical projection of at least one of the pixel electrode or the common electrode on the light blocking layer is not overlapped with the collimation hole.

15. The array substrate of claim 4, wherein a vertical projection of the touch electrode layer on the light blocking layer is not overlapped with the collimation hole.

16. The array substrate of claim 8, wherein a vertical projection of the touch lead on the light blocking layer is not overlapped with the collimation hole.

17. The array substrate of claim 12, wherein a vertical projection of at least one of the cathode or the anode on the light blocking layer is not overlapped with the collimation hole.

18. The array substrate of claim 1, further comprising:

a plurality of pixel units, wherein no pixel unit of the plurality of pixel units are overlapped with the collimation hole; and

an alignment layer;

wherein

in an area where the collimation hole is located, a surface of the alignment layer facing towards the base substrate is a first surface;

in an area where the plurality of pixel units are located, a surface of the alignment layer facing towards the base substrate is a second surface;

in an area where the electrode via is located, a surface of the alignment layer facing towards the base substrate is a third surface;

wherein a height difference between the first surface and the second surface is less than a height difference between the third surface and the second surface.

19. The array substrate of claim 1, wherein

the light sensing structure comprises an N-type semiconductor layer, an intrinsic semiconductor layer and a P-type semiconductor layer sequentially stacked along a direction from the base substrate towards the light blocking layer, wherein the electrode connecting structure is connected to the P-type semiconductor layer through the electrode via;

or

the light sensing structure comprises a P-type semiconductor layer, an intrinsic semiconductor layer and a N-type semiconductor layer sequentially stacked along the direction from the base substrate towards the light blocking layer, wherein the electrode connecting structure is connected to the N-type semiconductor layer through the electrode via.

20. A display device comprising an array substrate, wherein the array substrate comprises:

a base substrate;

a fingerprint recognition unit with a light sensing structure; and

a light blocking layer and an electrode connecting structure, wherein the light blocking layer and the electrode connecting structure are arranged at a side of the light sensing structure facing away from the base substrate;

wherein the light blocking layer is provided with a collimation hole, wherein a vertical projection of the collimation hole on the base substrate is partially overlapped with a vertical projection of the light sensing structure on the base substrate;

wherein an insulation layer is arranged between the electrode connecting structure and the light sensing structure, wherein the insulation layer is provided with an electrode via, and the electrode connecting structure is connected to the light sensing structure through the electrode via; and

wherein the vertical projection of the collimation hole on the base substrate is not overlapped with a vertical projection of the electrode via on the base substrate.