Touch screen and pressure touch detection method thereof

• US 10,025,411 B2
• Filed: 03/10/2016
• Issued: 07/17/2018
• Est. Priority Date: 09/17/2015
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Wang, Xuefei, Zhao, Jiayang
• Primary Examiner(s): FLORES, ROBERTO W
• Application Number:
  US15/504,810
• Publication Number:
  US 20170269756A1
• Time in Patent Office: 859 Days
• Field of Search: 345173-178
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 2203/04105 Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
• CPC Class Codes: G06F 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G06F 3/0447 Position sensing using the local deformation of sensor cells

Abstract

A touch screen and a pressure touch detection method thereof are disclosed and belong to a technical field of display. The touch screen includes a touch module including a plurality of sense electrodes and a plurality of touch electrodes, wherein the sense electrodes and the touch electrodes are respectively arranged in different layers. The touch screen has a display region and a non-display region, and at least one pressure sensor is arranged in the non-display region and includes a first electrode and a second electrode, the first electrode and the sense electrodes are arranged on a same layer, the second electrode and the touch electrodes are arranged on a same layer, and the pressure sensor detects a touch pressure according to a distance variation between the first electrode and the second electrode. The touch screen is applicable to a small-sized touch display apparatus.

Claims

1. A touch screen, comprising a display module and a touch module positioned on a side of a light exiting surface of the display module, the touch module including a plurality of sense electrodes and a plurality of touch electrodes, which are sequentially arranged above the display module, wherein the plurality of sense electrodes and the plurality of touch electrodes are respectively arranged in different layers and are insulated from each other;

and the touch screen has a display region and a non-display region surrounding the display region, and at least one pressure sensor is arranged in the non-display region,

the pressure sensor includes a first electrode and a second electrode, the first electrode and the sense electrodes are arranged on a same layer, the second electrode and the touch electrodes are arranged on a same layer, and the pressure sensor is configured to detect a touch pressure according to a distance variation between the first electrode and the second electrode,

the first electrode, the second electrode, the touch electrodes and the sense electrodes are connected with a touch chip via respective connecting lines, and

an electrostatic shielding wire is further arranged in the non-display region of the touch screen, the electrostatic shielding wire surrounds the display region;

corresponding connecting lines connected with the sense electrodes and the touch electrodes are positioned on a first side of the electrostatic shielding wire, and corresponding connecting lines connected with the first electrode and the second electrode of the pressure sensor are positioned on a second side of the electrostatic shielding wire, the first side of the electrostatic shielding wire is close to the display region and the second side of the electrostatic shielding wire is away from the display region.

2. The touch screen according to claim 1, wherein the first electrode, the second electrode, the touch electrodes and the sense electrodes are all made of a same material.

3. The touch screen according to claim 2, wherein the materials of all the first electrode, the second electrode, the touch electrodes and the sense electrodes are indium tin oxide.

4. The touch screen according to claim 2, wherein one pressure sensor is arranged on each corner of the touch screen.

5. The touch screen according to claim 2, further comprising a frame, the frame packaging a side of the display module, which side faces away from the light exiting surface.

6. The touch screen according to claim 2, wherein the touch screen is applied to any one of a mobile phone, a pad and a notebook computer.

7. The touch screen according to claim 1, wherein a layer where the first electrode is positioned and a layer where the second electrode is positioned are insulated and fixed mutually by adhesive.

8. The touch screen according to claim 7, wherein the adhesive is an optical clear adhesive.

9. The touch screen according to claim 7, wherein the first electrode, the second electrode, the touch electrodes and the sense electrodes are all made of a same material.

10. The touch screen according to claim 9, wherein the materials of all the first electrode, the second electrode, the touch electrodes and the sense electrodes are indium tin oxide.

11. The touch screen according to claim 9, wherein the adhesive is an optical clear adhesive.

12. The touch screen according to claim 7, further comprising a frame, the frame packaging a side of the display module, which side faces away from the light exiting surface.

13. The touch screen according to claim 1, wherein one pressure sensor is arranged on each corner of the touch screen.

14. The touch screen according to claim 1, further comprising a frame, the frame packaging a side of the display module, which side faces away from the light exiting surface.

15. The touch screen according to claim 1, wherein the touch screen is applied to any one of a mobile phone, a pad and a notebook computer.

16. A pressure touch detection method of a touch screen, for use in the touch screen according to claim 1, the pressure touch detection method comprising:

detecting a pressure used for a touch, according to a distance variation between the first electrode and the second electrode.

17. The pressure touch detection method of a touch screen according to claim 16, wherein detecting the pressure used for touch according to the distance variation between the first electrode and the second electrode includes:

determining a variation of capacitance by detecting the distance variation between the first electrode and the second electrode, and calculating pressure data according to the variation of the capacitance, so as to judge the pressure used for touch.