Array substrate, display panel, display apparatus, and method for manufacturing the array substrate

Patent metadata

Field	Value
Publication number	US-11980079-B2
Application number	US-202117755268-A
Country	US
Kind code	B2
Filing date	Mar 9, 2021
Priority date	Mar 9, 2021
Publication date	May 7, 2024
Grant date	May 7, 2024

Abstract

An array substrate, a display panel, a display apparatus, and a method for manufacturing the array substrate are provided. The array substrate includes: a base substrate; a plurality of pixels, at least one of the pixels including a pixel driver circuit and a light-emitting unit electrically connected to the pixel driver circuit; a fingerprint recognition structure including a first capacitor electrode configured to form a capacitor for fingerprint recognition between at least a part of a touch body and the first capacitor electrode in response to the at least a part of the touch body covering the first capacitor electrode. The fingerprint recognition structure is in the at least one pixel, the pixel driver circuit includes a thin film transistor including an active layer and a gate, and the first capacitor electrode is in the same layer as one of the active layer or the gate of the thin film transistor.

First claim

What is claimed is:

1. An array substrate, comprising:
a base substrate;
a plurality of pixels arranged on the base substrate, wherein the plurality of pixels are arranged on the base substrate in an array, and at least one of the plurality of pixels comprises a pixel driver circuit and a light-emitting unit electrically connected to the pixel driver circuit; and
a fingerprint recognition structure, comprising a first capacitor electrode configured to form a capacitor for fingerprint recognition between at least a part of a touch body and the first capacitor electrode in response to the at least a part of the touch body covering the first capacitor electrode,
wherein the fingerprint recognition structure is in the at least one pixel, the pixel driver circuit comprises a thin film transistor, the thin film transistor comprises an active layer and a gate, and the first capacitor electrode is in the same layer as one of the active layer of the thin film transistor and or the gate of the thin film transistor.

2. The array substrate according to claim 1 , wherein the first capacitor electrode is on a side of the light-emitting unit close to the base substrate.

3. The array substrate according to claim 1 , wherein the array substrate comprises a plurality of fingerprint recognition structures, and the plurality of fingerprint recognition structures are arranged in the plurality of pixels, respectively.

4. The array substrate according to claim 1 , wherein:
the base substrate comprises a first surface away from the active layer and a second surface close to the active layer;
the first capacitor electrode is in the same layer as the active layer of the thin film transistor, and the array substrate further comprises a buffer layer, wherein the buffer layer is between the second surface and the active layer; and
the capacitor for fingerprint recognition comprises a dielectric layer, wherein the dielectric layer comprises a part of the base substrate and a part of the buffer layer.

5. The array substrate according to claim 4 , wherein the first capacitor electrode comprises a doped semiconductor material.

6. The array substrate according to claim 4 , wherein in a same pixel, a distance between the first capacitor electrode and the active layer close to the first capacitor electrode is more than 1 micrometer.

7. The array substrate according to claim 4 , wherein:
the base substrate comprises a transparent material; and/or
a thickness of the base substrate is between 5 micrometers and 20 micrometers; and/or
a thickness of the buffer layer is between 1000 angstroms and 4000 angstroms.

8. The array substrate according to claim 1 , wherein:
the base substrate comprises a first surface away from the active layer and a second surface close to the active layer;
the first capacitor electrode is in the same layer as the gate of the thin film transistor, and the array substrate further comprises a buffer layer and a first gate insulating layer, wherein the buffer layer is between the second surface and the active layer, and the first gate insulating layer is between the active layer and the gate; and
the capacitor for fingerprint recognition comprises a dielectric layer, wherein the dielectric layer comprises a part of the base substrate, a part of the buffer layer, and a part of the first gate insulating layer.

9. The array substrate according to claim 8 , wherein in a same pixel, a distance between the first capacitor electrode and the gate close to the first capacitor electrode is more than 3 micrometers.

10. The array substrate according to claim 1 , wherein:
the array substrate further comprises a shielding layer between the base substrate and the active layer, and an orthographic projection of the shielding layer on the base substrate covers an orthographic projection of the active layer of the thin film transistor on the base substrate; and
the fingerprint recognition structure further comprises an excitation component, wherein the excitation component is configured to generate an excitation signal for fingerprint recognition, and the excitation component is in the same layer as the shielding layer.

11. The array substrate according to claim 10 , wherein an orthographic projection of the excitation component on the base substrate surrounds an orthographic projection of the first capacitor electrode on the base substrate.

12. The array substrate according to claim 1 , wherein the light-emitting unit comprises an anode, a cathode, and a light-emitting layer interposed between the anode and the cathode, wherein the cathode is further away from the base substrate than the anode, the anode is a transparent anode, and the cathode is a reflective cathode.

13. The array substrate according to claim 1 , wherein the thin film transistor further comprises a source and a drain, wherein an orthographic projection of each of the active layer, the gate, the source, and the drain of the thin film transistor on the base substrate does not overlap with an orthographic projection of the first capacitor electrode on the base substrate.

14. The array substrate according to claim 13 , wherein:
the array substrate further comprises a first signal line and a second signal line, wherein the first signal line and the second signal line are configured to provide electrical signals to the pixel driver circuit, respectively, the first signal line extends in a first direction, and the second signal line extends in a second direction; and
an orthographic projection of each of the first signal line and the second signal line on the base substrate does not overlap with the orthographic projection of the first capacitor electrode on the base substrate.

15. The array substrate according to claim 14 , wherein:
the second signal line is configured to provide a data signal to the pixel driver circuit; and
the data signal is further provided to an excitation component.

16. A display panel, comprising the array substrate according to claim 1 .

17. A display apparatus, comprising the display panel according to claim 16 .

18. A display apparatus, comprising the array substrate according to claim 1 .

19. A method for manufacturing an array substrate, comprising:
providing a base substrate;
forming a fingerprint recognition structure on the base substrate, wherein the fingerprint recognition structure comprises a first capacitor electrode, and the first capacitor electrode is configured to form a capacitor for fingerprint recognition between at least a part of a touch body and the first capacitor electrode in response to the at least a part of the touch body covering the first capacitor electrode; and
forming a plurality of pixels on the base substrate, wherein the plurality of pixels are arranged on the base substrate in an array, and at least one of the plurality of pixels comprises a pixel driver circuit and a light-emitting unit electrically connected to the pixel driver circuit,
wherein the fingerprint recognition structure is in the at least one pixel, the pixel driver circuit comprises a thin film transistor, the thin film transistor comprises an active layer and a gate, and the first capacitor electrode and one of the active layer of the thin film transistor and or the gate of the thin film transistor are formed through the same patterning process.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Qu Caiyu
• Hao Yanjun
• Liu Hao
• Song Zunqing
• Li Dong
• Zhang Huijuan
• Liu Zheng

Classifications

• H10K59/12

  Active-matrix OLED [AMOLED] displays · CPC title

• H10K59/40 Primary

  OLEDs integrated with touch screens · CPC title

• G06V40/1306

  non-optical, e.g. ultrasonic or capacitive sensing · CPC title

• H10K59/1201

  Manufacture or treatment · CPC title

• G09G3/3233

  with pixel circuitry controlling the current through the light-emitting element · CPC title