Touch circuit, touch array circuit and method for driving the same, and display panel

Patent metadata

Field	Value
Publication number	US-10678361-B2
Application number	US-201816333808-A
Country	US
Kind code	B2
Filing date	Mar 7, 2018
Priority date	Apr 20, 2017
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

The present disclosure provides a touch circuit, a touch array circuit and a method for driving the same, and a display panel. The touch circuit includes: a first resistor, a second resistor, a control sub-circuit, a third resistor, a strain resistor and a Hall element. The first resistor is connected to a first scanning signal terminal, the control sub-circuit, the second resistor and the Hall element. The second resistor is further connected to a first level terminal and the third resistor. The control sub-circuit is further connected to the strain resistor and a second scanning signal terminal. The strain resistor is further connected to the third resistor and the Hall element. The Hall element is further connected to an inductive voltage output terminal.

First claim

We claim:

1. A touch circuit, comprising a first resistor, a second resistor, a control sub-circuit, a third resistor, a strain resistor and a Hall element, wherein
a first terminal of the first resistor is electrically connected to a first scanning signal terminal and an input terminal of the control sub-circuit, and a second terminal of the first resistor is electrically connected to a first terminal of the second resistor and a first voltage input terminal of the Hall element,
a second terminal of the second resistor is electrically connected to a first level terminal and a first terminal of the third resistor,
an output terminal of the control sub-circuit is electrically connected to a first terminal of the strain resistor, and a control terminal of the control sub-circuit is electrically connected to a second scanning signal terminal,
a second terminal of the strain resistor is electrically connected to a second terminal of the third resistor and a second voltage input terminal of the Hall element, and
a voltage output terminal of the Hall element is electrically connected to an inductive voltage output terminal.

2. The touch control circuit according to claim 1 , wherein when the strain resistor is not stress-deformed, resistance values of the first resistor, the second resistor, the third resistor, and the strain resistor satisfy the following formula:
R 1/ R 2= Rf/R 3,

wherein R1 is the resistance value of the first resistor, R2 is the resistance value of the second resistor, R3 is the resistance value of the third resistor, and Rf is the resistance value of the strain resistor.

3. The touch control circuit according to claim 1 , wherein the control sub-circuit comprises a thin film transistor,
wherein the thin film transistor has one of a source and a drain acting as the input terminal of the control sub-circuit, the other of the source and the drain acting as the output terminal of the control sub-circuit, and a gate acting as the control terminal of the control sub-circuit.

4. A touch array circuit, comprising a plurality of touch circuits according to claim 1 which are arranged in an array.

5. The touch array circuit according to claim 4 , wherein
touch circuits in a same row of the array connect to a common first scanning signal terminal; and
touch circuits in a same column of the array connect to a common second scanning signal terminal and a common inductive voltage output terminal.

6. The touch array circuit according to claim 4 , wherein the plurality of touch circuits in the touch array circuit connect to a common first level terminal.

7. The touch array circuit according to claim 4 , wherein touch circuits in a same row of the array connect to a common first resistor, a common second resistor, and a common third resistor.

8. A method for performing touch detection on the touch array circuit according to claim 4 , comprising:
inputting first scanning signals to first scanning signal terminals, sequentially inputting a level at which a control sub-circuit is turned on to second scanning signal terminals of different columns of touch circuits, and applying magnetic fields to Hall elements;
detecting voltages at inductive voltage output terminals; and
determining occurrence of a touch and a position where the touch occurs according to the detected voltages at the inductive voltage output terminals.

9. The method according to claim 8 , wherein the step of applying magnetic fields to Hall elements comprises applying a magnetic field to a Hall element corresponding to a second scanning signal terminal to which the level at which the control sub-circuit is turned on is being input.

10. A method for performing touch detection on the touch array circuit according to claim 4 , comprising:
inputting first scanning signals to first scanning signal terminals, and inputting a level at which a control sub-circuit is turned on to all second scanning signal terminals in the touch array circuit;
detecting voltages at inductive voltage output terminals; and
determining occurrence of a touch and a position where the touch occurs according to the detected voltages at the inductive voltage output terminals.

11. The method according to claim 8 , wherein the step of inputting first scanning signals to first scanning signal terminals comprises sequentially inputting a level at which a potential difference is generated across a Hall element to first scanning signal terminals of different rows of touch circuits.

12. A display panel comprising the touch array circuit according to claim 4 .

13. A touch array circuit, comprising a plurality of touch circuits according to claim 2 which are arranged in an array.

14. The touch array circuit according to claim 13 , wherein
touch circuits in a same row of the array connect to a common first scanning signal terminal, and connect to a common first resistor, a common second resistor, and a common third resistor;
touch circuits in a same column of the array connect to a common second scanning signal terminal and a common inductive voltage output terminal; and

the plurality of touch circuits in the touch array circuit connect to a common first level terminal.

15. A method for performing touch detection on the touch array circuit according to claim 13 , comprising:
inputting first scanning signals to first scanning signal terminals, sequentially inputting a level at which a control sub-circuit is turned on to second scanning signal terminals of different columns of touch circuits, and applying magnetic fields to Hall elements;
detecting voltages at inductive voltage output terminals; and
determining occurrence of a touch and a position where the touch occurs according to the detected voltages at the inductive voltage output terminals.

16. A method for performing touch detection on the touch array circuit according to claim 13 , comprising:
inputting first scanning signals to first scanning signal terminals, and inputting a level at which a control sub-circuit is turned on to all second scanning signal terminals in the touch array circuit;
detecting voltages at inductive voltage output terminals; and
determining occurrence of a touch and a position where the touch occurs according to the detected voltages at the inductive voltage output terminals.

17. A touch array circuit, comprising a plurality of touch circuits according to claim 3 which are arranged in an array.

18. The touch array circuit according to claim 17 , wherein
touch circuits in a same row of the array connect to a common first scanning signal terminal, and connect to a common first resistor, a common second resistor, and a common third resistor;
touch circuits in a same column of the array connect to a common second scanning signal terminal and a common inductive voltage output terminal; and

the plurality of touch circuits in the touch array circuit connect to a common first level terminal.

19. A method for performing touch detection on the touch array circuit according to claim 17 , comprising:
inputting first scanning signals to first scanning signal terminals, sequentially inputting a level at which a control sub-circuit is turned on to second scanning signal terminals of different columns of touch circuits, and applying magnetic fields to Hall elements;
detecting voltages at inductive voltage output terminals; and
determining occurrence of a touch and a position where the touch occurs according to the detected voltages at the inductive voltage output terminals.

Assignees

• Beijing Boe Display Tech Co
• Boe Technology Group Co Ltd

Inventors

• Zhang Kan
• Zhang Bin
• Dong Dianzheng
• Zhang Qiang
• Chen Pengming
• Xie Yu
• Wang Guangxing

Classifications

• G06F3/04166 Primary

  Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184) · CPC title

• G06F2203/04101

  2.5D-digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F3/04144

  using an array of force sensing means (position sensing using the local deformation of sensor cells G06F3/0447) · CPC title

• G06F3/046

  by electromagnetic means · CPC title