Touch liquid crystal display and method of controlling the same

Patent metadata

Field	Value
Publication number	US-9785018-B2
Application number	US-201514700097-A
Country	US
Kind code	B2
Filing date	Apr 29, 2015
Priority date	Dec 22, 2014
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

A touch liquid crystal display is disclosed. The display includes a TFT array substrate, and an opposite substrate opposite to the TFT array substrate. The TFT array substrate and the opposite substrate collectively define a display area and a non-display area. In addition, the opposite substrate includes a first substrate, a plurality of first electrodes, and a plurality of second electrodes, where the plurality of first electrodes are located in the display area of the first substrate, and the plurality of second electrodes are located in the non-display area of the first substrate. The TFT array substrate includes a second substrate, and a plurality of third electrodes, where the third electrodes are located in the display area of the second substrate and are opposite the first electrodes, and where the third electrodes are common electrodes of the TFT array substrate.

First claim

What is claimed is:

1. A touch liquid crystal display, comprising:
a thin-film-transistor (TFT) array substrate; and
an opposite substrate opposite to the TFT array substrate,
wherein: the TFT array substrate and the opposite substrate collectively define a display area and a non-display area,
the opposite substrate comprises:
a first substrate, a plurality of first electrodes, and a plurality of second electrodes,
wherein the plurality of first electrodes are located in the display area of the first substrate but not in the non-display area of the first substrate, and the plurality of second electrodes are located in the non-display area of the first substrate, and

the TFT array substrate comprises:
a second substrate, and a plurality of third electrodes,
wherein the third electrodes are located in the display area of the second substrate and are opposite the first electrodes, and wherein the third electrodes are common electrodes of the TFT array substrate,

wherein a touch in the non-display area is detected based on a change of coupling capacitance between the first electrodes, and the second electrodes by the first electrodes.

2. The touch liquid crystal display according to claim 1 , wherein the first electrodes are driving electrodes, and the second electrodes and the third electrodes are sensing electrodes.

3. The touch liquid crystal display according to claim 1 , wherein the first electrodes are driving electrodes, the third electrodes are sensing electrodes, and the plurality of second electrodes comprises both driving electrodes and sensing electrodes.

4. The touch liquid crystal display according to claim 1 , wherein the second electrodes and the third electrodes are driving electrodes, and the first electrodes are sensing electrodes.

5. The touch liquid crystal display according to claim 1 , wherein the third electrodes are driving electrodes, the first electrodes are sensing electrodes, and the plurality of second electrodes comprises both driving electrodes and sensing electrodes.

6. The much liquid crystal display according to claim 1 , wherein the first electrodes extend along a first direction and are spaced apart from one another, the third electrodes extend along a second direction and are spaced apart from one another, and the first direction intersects the second direction.

7. The touch liquid crystal display according to claim 6 , wherein the first direction is substantially perpendicular to the second direction.

8. The touch liquid crystal display according to claim 1 , wherein the first electrodes and the second electrodes are located on a same surface of the first substrate.

9. The touch liquid crystal display according to claim 8 , wherein the first electrodes and the second electrodes are located on a surface of the first substrate facing away from the TFT array substrate.

10. The touch liquid crystal display according to claim 1 , the opposite substrate is a color filter substrate.

11. The touch liquid crystal display according to claim 1 , further comprising a flexible printed circuit board, wherein the third electrodes are electrically connected with the second electrodes by the flexible printed circuit board.

12. The touch liquid crystal display according to claim 11 , further comprising a wire terminal located in the non-display area, wherein the third electrodes and the second electrodes are respectively electrically connected with the flexible printed circuit board by the wire terminal.

13. The touch liquid crystal display according to claim 1 , wherein each of the second electrodes has a strip shape, a sheet shape, or a combination of a strip shape and a sheet shape, and wherein the second electrodes are spaced apart from one another on at least one side of the display area.

14. The touch liquid crystal display according to claim 13 , wherein each of the plurality of second electrodes has a sheet shape, and the second electrodes are spaced apart from one another at periphery of the display area.

15. A method of controlling a touch liquid crystal display, wherein the touch liquid crystal display comprises a thin-film-transistor (TFT) array substrate and an opposite substrate opposite to the TFT array substrate, wherein the TFT array substrate and the opposite substrate collectively define a display area and a non-display area, wherein the opposite substrate comprises a first substrate, a plurality of first electrodes, and a plurality of second electrodes, wherein the plurality of first electrodes are located in the display area of the first substrate but not in the non-display area of the first substrate, and the plurality of second electrodes are located in the non-display area of the first substrate, wherein the TFT array substrate comprises a second substrate, and a plurality of third electrodes, wherein the third electrodes are located in the display area of the second substrate and are opposite the first electrodes, and wherein the third electrodes are common electrodes of the TFT array substrate, wherein the method comprises:
applying a first scanning signal to the third electrodes;
detecting a change of coupling capacitance between the first electrodes and the third electrodes with the first electrodes to obtain a coordinate of a touch in the display area;
applying a second scanning signal to the second electrodes; and
detecting a change of coupling capacitance between the first electrodes and the second electrodes by the first electrodes to obtain a coordinate of a touch in the non-display area.

16. A method of controlling a touch liquid crystal display, wherein the touch liquid crystal display comprises a thin-film-transistor (TFT) array substrate and an opposite substrate opposite to the TFT array substrate, wherein the TFT array substrate and the opposite substrate collectively define a display area and a non-display area, wherein the opposite substrate comprises a first substrate, a plurality of first electrodes, and a plurality of second electrodes, wherein the plurality of first electrodes are located in the display area of the first substrate but not in the non-display area of the first substrate, and the plurality of second electrodes are located in the non-display area of the tint substrate, wherein the TFT array substrate comprises a second substrate, and a plurality of third electrodes, wherein the third electrodes are located in the display area of the second substrate and are opposite the first electrodes, and wherein the third electrodes are common electrodes of the TFT array substrate, wherein the method comprises:
applying a first scanning signal to the first electrodes or to the third electrodes;
detecting a change of coupling capacitance between the first electrodes and the third electrodes with the first electrodes or the third electrodes without the first scanning signal applied thereto, to obtain a coordinate of a touch on the display area;
applying a second scanning signal to the plurality of second electrodes; and
detecting a self capacitance of the second electrodes by the second electrodes, to obtain a coordinate of a touch on the non-display area.

17. The method according to claim 16 , wherein applying the first and second scanning signals are performed substantially at the same time.

18. The method according to claim 16 , wherein the first scanning signal is the same as the second scanning signal.

Assignees

• Shanghai Tianma Microelectronics Co Ltd
• Tianma Microelectronics Co Ltd

Inventors

• Li Gujun
• Zhang Xianxiang
• Xu Yingying
• Li Xiaoye
• Liu Gang
• Zhou Xingyao
• Yang Kang

Classifications

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G02F2001/133388

  Physics · mapped topic

• G06F3/044 Primary

  by capacitive means · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G02F1/1362

  Active matrix addressed cells {(G02F1/134336, G02F1/134363 take precedence)} · CPC title