Pressure detection unit, pressure detection method and display panel

• US 9,904,398 B2
• Filed: 09/20/2016
• Issued: 02/27/2018
• Est. Priority Date: 03/03/2016
• Status: Active Grant

• Current Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Inventors: Yang, Shengji, Dong, Xue, Xue, Hailin, Chen, Xiaochuan, Wang, Haisheng, Ding, Xiaoliang, Wang, Chunlei, Li, Wei, Sun, Zebin, Sun, Lingyu, Liu, Yingming
• Primary Examiner(s): Lee, Gene W
• Application Number:
  US15/270,243
• Publication Number:
  US 20170255313A1
• Time in Patent Office: 525 Days
• 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 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/041662 using alternate mutual and self-capacitive scanning
• 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 3/0447 Position sensing using the local deformation of sensor cells
• CPC Class Codes: H03K 17/962 Capacitive touch switches
• CPC Class Codes: H03K 2017/9615 using three electrodes per touch switch
• CPC Class Codes: H03K 2217/94036 Multiple detection, i.e. where different switching signals are generated after operation of the user is detected at different time instants at different locations during the actuation movement by two or more sensors of the same or different kinds

Abstract

A pressure detection unit, a pressure detection method and a display panel are disclosed. The pressure detection unit includes a touch control pressure scanning electrode, a constant voltage electrode, a detection module and at least one touch control pressure induction electrode. A touch control pressure scanning signal is inputted into the touch control pressure scanning electrode; the constant voltage electrode is arranged opposite to the touch control pressure scanning electrode, and a constant voltage is inputted into the constant voltage electrode; an orthographic projection of the touch control pressure induction electrode in a plane where the touch control pressure scanning electrode locates does not overlap with the touch control pressure scanning electrode; the detection module is configured for determining a pressure applied on the pressure detection unit according to change of capacitance.

Claims

1. A pressure detection unit, comprising:

a touch control pressure scanning electrode, which is configured for inputting a touch control pressure scanning signal;

a constant voltage electrode, which is arranged opposite to the touch control pressure scanning electrode, wherein the constant voltage electrode is configured for inputting a constant voltage;

at least one touch control pressure induction electrode, wherein an orthographic projection of the at least one touch control pressure induction electrode in a plane where the touch control pressure scanning electrode locates does not overlap with the touch control pressure scanning electrode; and

a detection module, which is electrically connected to the touch control pressure scanning electrode and the at least one touch control pressure induction electrode, wherein the detection module is configured for determining a pressure applied on the pressure detection unit according to change of directly opposite capacitance generated between the touch control pressure scanning electrode and the constant voltage electrode and change of coupling capacitance generated between the touch control pressure scanning electrode and the at least one touch control pressure induction electrode upon a touch control operation occurring.

2. The pressure detection unit according to claim 1, wherein, the constant voltage electrode and the at least one touch control pressure induction electrode are arranged on a same plane.

3. The pressure detection unit according to claim 1, wherein, the constant voltage electrode is a plate-shaped electrode and the at least one touch control pressure induction electrode is a ring-shaped electrode.

4. The pressure detection unit according to claim 3, wherein, the orthographic projection of the at least one touch control pressure induction electrode in the plane where the touch control pressure scanning electrode locates encircles an orthographic projection of the constant voltage electrode in the plane where the touch control pressure scanning electrode locates.

5. The pressure detection unit according to claim 3, wherein, the constant voltage electrode is a circular plate-shaped electrode and the at least one touch control pressure induction electrode is a circular ring-shaped electrode.

6. The pressure detection unit according to claim 5, wherein, the orthographic projection of the constant voltage electrode in the plane where the touch control pressure scanning electrode locates is concentric with the orthographic projection of the at least one touch control pressure induction electrode in the plane where the touch control pressure scanning electrode locates.

7. The pressure detection unit according to claim 3, wherein, the constant voltage electrode is a rectangular plate-shaped electrode and the at least one touch control pressure induction electrode is a rectangular ring-shaped electrode, and an outside edge of the constant voltage electrode is parallel with an inside edge of the at least one touch control pressure induction electrode.

8. The pressure detection unit according to claim 3, wherein, the pressure detection unit comprise at least two touch control pressure induction electrode, the touch control pressure induction electrodes are insulated with each other, and the orthographic projections of the touch control pressure induction electrodes in the plane where the touch control pressure scanning electrode locates are arranged in a sequentially encircled way.

9. The pressure detection unit according to claim 1, wherein, the constant voltage electrode is grounded.

10. The pressure detection unit according to claim 1, wherein, the pressure detection unit comprises two touch control pressure induction electrodes.

11. The pressure detection unit according to claim 1, wherein, the detection module comprises:

a first detection sub-module, which is electrically connected to the touch control pressure scanning electrode, wherein the first detection sub-module is configured for detecting a first induction signal actually loaded on the touch control pressure scanning electrode upon the touch control operation occurring;

at least one second detection sub-module, which is in one-to-one correspondence with the at least one touch control pressure induction electrode, wherein the at least one second detection sub-module is electrically connected to the corresponding at least one touch control pressure induction electrode, and configured for detecting a second induction signal loaded on the at least one touch control pressure induction electrodes upon the touch control operation occurring; and

a determination sub-module, which is electrically connected to the first detection sub-module and the at least one second detection sub-modules, wherein the determination sub-module is configured for determining the pressure applied on the pressure detection unit according to the first induction signal and each of the second induction signals.

12. A pressure detection method, which is based on a pressure detection unit, which employs the pressure detection unit according to claim 1, the pressure detection method comprising:

applying a touch control pressure scanning signal on the touch control pressure scanning electrode; and

determining a pressure applied on the pressure detection unit according to change of directly opposite capacitance generated between the touch control pressure scanning electrode and the constant voltage electrode and change of coupling capacitance generated between the touch control pressure scanning electrode and the at least one touch control pressure induction electrode.

13. The pressure detection method according to claim 12, wherein, determining the pressure applied on the pressure detection unit according to the change of the directly opposite capacitance generated between the touch control pressure scanning electrode and the constant voltage electrode and the change of the coupling capacitance generated between the touch control pressure scanning electrode and the at least one touch control pressure induction electrode comprises:

detecting a first induction signal loaded on the touch control pressure scanning electrode;

detecting a second induction signal loaded on the at least one touch control pressure induction electrode; and

determining the pressure applied on the pressure detection unit according to the first induction signal and the second induction signal.

14. A display panel, comprising a pressure detection unit according to claim 1.

15. The display panel according to claim 14, wherein, the display panel is a liquid crystal display panel or an active matrix organic light emitting diode (AMOLED) display panel.