Texture detection circuit, charging circuit, driving method and touch display panel

Patent metadata

Field	Value
Publication number	US-2021124896-A1
Application number	US-202017256047-A
Country	US
Kind code	A1
Filing date	May 25, 2020
Priority date	May 27, 2019
Publication date	Apr 29, 2021
Grant date	—

Abstract

A texture detection circuit, a charging circuit, driving methods and a touch display panel are provided. The texture detection circuit includes a first photosensitive element and a switching sub-circuit. A first electrode of the first photosensitive element is connected with a signal readout line. A second electrode of the first photosensitive element is connected with the switching sub-circuit. The switching sub-circuit is connected with a reverse power end and a charging sub-circuit, and is configured to switch a connection state of the second electrode of the first photosensitive element between a first connection state and a second connection state. The first connection state is a state in which the second electrode of the first photosensitive element is connected with the reverse power end. The second connection state is a state in which the second electrode of the first photosensitive element is connected with the charging sub-circuit.

First claim

What is claimed is:

1 . A texture detection circuit, comprising a first photosensitive element and a switching sub-circuit, wherein
a first electrode of the first photosensitive element is connected with a signal readout line, and a second electrode of the first photosensitive element is connected with the switching sub-circuit; the switching sub-circuit is also connected with a reverse power end and a charging sub-circuit, and the switching sub-circuit is configured to switch a connection state of the second electrode of the first photosensitive element between a first connection state and a second connection state, wherein the first connection state is a state in which the second electrode of the first photosensitive element is connected with the reverse power end, and the second connection state is a state in which the second electrode of the first photosensitive element is connected with the charging sub-circuit.

2 . The texture detection circuit according to claim 1 , wherein the switching sub-circuit comprises a second transistor and a third transistor;
a gate of the second transistor is connected with a second control signal terminal, a first electrode of the second transistor is connected with the reverse power end, and a second electrode of the second transistor is connected with the second electrode of the first photosensitive element; a gate of the third transistor is connected with a third control signal terminal, a first electrode of the third transistor is connected with the second electrode of the first photosensitive element and a second electrode of the third transistor is connected with the charging sub-circuit.

3 . The texture detection circuit according to claim 1 , further comprising a first on-off sub-circuit, wherein
the first on-off sub-circuit is connected in series between the first electrode of the first photosensitive element and the signal readout line.

4 . The texture detection circuit according to claim 3 , wherein the first on-off sub-circuit comprises a first transistor;
a gate of the first transistor is connected with a first control signal terminal, a first electrode of the first transistor is connected with the first electrode of the first photosensitive element and a second electrode of the first transistor is connected with the signal readout line.

5 . A charging circuit, comprising a charging sub-circuit and the texture detection circuit according to claim 1 , wherein the second electrode of the first photosensitive element in the texture detection circuit is connected with the charging sub-circuit;
the texture detection circuit is configured to provide an electrical signal to the charging sub-circuit, wherein the electrical signal is acquired after the first photosensitive element converts a detected optical signal; and the charging sub-circuit is configured to store the electrical signal in form of electric energy.

6 . The charging circuit according to claim 5 , comprising a plurality of texture detection circuits connected in series, wherein
in the plurality of texture detection circuits connected in series, the switching sub-circuit in a first texture detection circuit is connected with the charging sub-circuit, and other switching sub-circuits are connected with the charging sub-circuit through the texture detection circuits connected in series between the other switching sub-circuits and the charging sub-circuit; wherein the first texture detection circuit is any texture detection circuit located at both ends of the plurality of texture detection circuits connected in series, other switching sub-circuits are switching sub-circuits in other texture detection circuits, and the other texture detection circuits are texture detection circuits in the plurality of texture detection circuits connected in series other than the first texture detection circuit.

7 . The charging circuit according to claim 5 , further comprising a second on-off sub-circuit and a first capacitor, wherein
the second on-off sub-circuit is connected in series between the first electrode of the first photosensitive element and the charging sub-circuit; one terminal of the first capacitor is connected in series between the first electrode of the first photosensitive element and the second on-off sub-circuit, the other terminal of the first capacitor is connected with a first power end, and the first capacitor is configured to: get charged by the electrical signal from the first electrode of the first photosensitive element when the second on-off sub-circuit is in an off state, and discharge to the charging sub-circuit when the second on-off sub-circuit is in an on state.

8 . The charging circuit according to claim 7 , wherein the second on-off sub-circuit comprises a fourth transistor;
a gate of the fourth transistor is connected with a fourth control signal terminal, a first electrode of the fourth transistor is connected with the first electrode of the first photosensitive element, and a second electrode of the fourth transistor is connected with the charging sub-circuit.

9 . The charging circuit according to claim 7 , further comprising a third on-off sub-circuit, wherein
the third on-off sub-circuit is connected in series between the first electrode of the first photosensitive element and one terminal of the first capacitor.

10 . The charging circuit according to claim 9 , wherein the third on-off sub-circuit comprises a fifth transistor;
a gate of the fifth transistor is connected with a fifth control signal terminal, a first electrode of the fifth transistor is connected with the first electrode of the first photosensitive element, and a second electrode of the fifth transistor is connected with one terminal of the first transistor.

11 . The charging circuit according to claim 9 , further comprising a sensing sub-circuit, wherein
the sensing sub-circuit is configured to sense a light intensity of ambient light in an environment where the charging circuit is located and output a light intensity sensing signal to a controller based on the light intensity, so that the controller controls, based on the light intensity sensing signal, time periods when one or more of the third on-off sub-circuit and the second on-off sub-circuit are in the on state.

12 . The charging circuit according to claim 11 , wherein the sensing sub-circuit comprises a second photosensitive element.

13 . The charging circuit according to claim 5 , wherein the charging sub-circuit comprises a battery.

14 . A method for driving a texture detection circuit, wherein the texture detection circuit comprises a first photosensitive element and a switching sub-circuit, and the method for driving the texture detection circuit comprises a charging stage and a texture detection stage;
at the texture detection stage, the switching sub-circuit is controlled to connect a second electrode of the first photosensitive element with a reverse power end; and at the charging stage, the switching sub-circuit is controlled to connect the second electrode of the first photosensitive element with a charging sub-circuit.

15 . The method for driving the texture detection circuit according to claim 14 , wherein the texture detection circuit further comprises a first on-off sub-circuit, and the method driving the texture detection circuit further comprises:
at the texture detection stage, controlling the first on-off sub-circuit to connect a first electrode of the first photosensitive element with a signal readout line; and at the charging stage, controlling the first on-off sub-circuit to disconnect the first elec

Assignees

• Boe Technology Group Co Ltd

Inventors

• Ding Xiaoliang
• Wang Haisheng
• Wang Lei
• Qin Yunke
• Liu Yingming

Classifications

• H02J7/971

  the charge cycle being controlled or terminated in response to non-electric parameters · CPC title

• H02J2105/44

  Portable electronic devices · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• H02J50/001 Primary

  Energy harvesting or scavenging · CPC title

• G06V40/1318 Primary

  using electro-optical elements or layers, e.g. electroluminescent sensing · CPC title