Touch display panel, driving method thereof and touch display device

• US 10,642,406 B2
• Filed: 08/14/2017
• Issued: 05/05/2020
• Est. Priority Date: 09/09/2016
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd., Hefei BOE Optoelectronics Technology Company Limited (BOE Technology Group Co., Ltd.)
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Lv, Lei, Xu, Fei
• Primary Examiner(s): Ghebretinsae, Temesghen
• Assistant Examiner(s): Karki, Paras D
• Application Number:
  US15/675,894
• Publication Number:
  US 20180074642A1
• Time in Patent Office: 995 Days
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/04166 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 Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 3/2092 Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

A touch display panel, a driving method thereof and a touch display device are disclosed. The touch display panel includes a base substrate, a plurality of touch electrode blocks in an array disposed on the base substrate, and touch wires, and further includes a switching transistor, a storage capacitor, a first control chip and a second control chip. The switching transistor has a gate electrode connected to the first control chip, a source electrode connected to an end of the storage capacitor and a drain electrode connected to the touch electrode block; the first control chip is configured to output a first control signal to control the switching transistor to be turned off, and output a second control signal to control the switching transistor to be turned on; and the second control chip is configured to output a charging signal to charge the storage capacitor.

Claims

1. A touch display panel, comprising a base substrate, a plurality of touch electrode blocks in an array disposed on the base substrate, a plurality of touch wires and a touch control chip, each of the touch electrode blocks being electrically connected to the touch control chip through one of the touch wires, and the touch display panel further comprising at least one switching transistor, a storage capacitor, a first control chip and a second control chip, wherein

the switching transistor has a gate electrode being connected to the first control chip and being controllable by the first control chip, a source electrode of the switching transistor connected to an electrode plate of the storage capacitor through a via hole and a drain electrode of the switching transistor connected to the touch electrode block, and the touch electrode block is connected to the storage capacitor via the source electrode and the drain electrode of the switching transistor and is chargeable by the storage capacitor;

the electrode plate of the storage capacitor is connected to the second control chip through a via hole;

the second control chip is configured to, before switching to a touch detection period, output a charging signal to charge the storage capacitor, such that the storage capacitor has a preset voltage; and

the first control chip is configured to, before switching to the touch detection period, output a first control signal to the gate electrode of the switching transistor to control the switching transistor to be turned off, and when switching to a display period, output a second control signal to the gate electrode of the switching transistor to control the switching transistor to be turned on so that the touch electrode block is conducted with the storage capacitor and is charged by the storage capacitor having the preset voltage.

2. The touch display panel of claim 1, wherein after switching to the display period, the first control chip is further configured to, when it is detected that a voltage of the touch electrode block is equal to the voltage of the storage capacitor, output a first control signal to control the switching transistor to be turned off;

and

the second control chip is further configured to, when it is detected that the voltage of the touch electrode block is equal to the voltage of the storage capacitor, output a turn-off signal to stop charging the storage capacitor.

3. The touch display panel of claim 2, wherein after switching to the display period, the second control chip is further configured to, when it is detected that the voltage of the touch electrode block is a common voltage, output a charging signal to charge the storage capacitor, such that the storage capacitor has the preset voltage.

4. The touch display panel of claim 3, wherein an absolute value of the preset voltage is larger than or equal to an absolute value of the common voltage.

5. The touch display panel of claim 1, wherein the storage capacitor is disposed at a peripheral region of the base substrate.

6. The touch display panel of claim 5, wherein the storage capacitor has a pattern of a hollow rectangular shape.

7. The touch display panel of claim 1, wherein the number of the at least one switching transistor is the same as that of the touch electrode blocks, each of the at least one switching transistor has a gate electrode connected to the first control chip, a source electrode connected to the storage capacitor and a drain electrode connected to a corresponding one of the touch electrode blocks.

8. The touch display panel of claim 7, wherein the switching transistor is an N-type thin film transistor.

9. A touch display device, comprising the touch display panel of claim 1.

10. The touch display panel of claim 9, wherein after switching to the display period, the first control chip is further configured to, when it is detected that a voltage of the touch electrode block is equal to the voltage of the storage capacitor, output a first control signal to control the switching transistor to be turned off;

and

the second control chip is further configured to, when it is detected that the voltage of the touch electrode block is equal to the voltage of the storage capacitor, output a turn-off signal to stop charging the storage capacitor.

11. The touch display panel of claim 10, wherein after switching to the display period, the second control chip is further configured to, when it is detected that the voltage of the touch electrode block is a common voltage, output a charging signal to charge the storage capacitor, such that the storage capacitor has the preset voltage.

12. The touch display panel of claim 11, wherein an absolute value of the preset voltage is larger than or equal to an absolute value of the common voltage.

13. The touch display panel of claim 9, wherein the storage capacitor is disposed at a peripheral region of the base substrate.

14. The touch display panel of claim 13, wherein the storage capacitor has a pattern of a hollow rectangular shape.

15. The touch display panel of claim 9, wherein the number of the at least one switching transistor is the same as that of the touch electrode blocks, each of the at least one switching transistor has a gate electrode connected to the first control chip, a source electrode connected to the storage capacitor and a drain electrode connected to a corresponding one of the touch electrode blocks.

16. The touch display panel of claim 15, wherein the switching transistor is an N-type thin film transistor.

17. A driving method for a touch display panel, the touch display panel comprising a base substrate, a plurality of touch electrode blocks in an array disposed on the base substrate, a plurality of touch wires and a touch control chip, each of the touch electrode blocks being electrically connected to the touch control chip through one of the touch wires, and the touch display panel further comprising at least one switching transistor, a storage capacitor, a first control chip and a second control chip, wherein the switching transistor has a gate electrode being connected to the first control chip and being controllable by the first control chip, a source electrode of the switching transistor connected to an electrode plate end of the storage capacitor, a drain electrode of the switching transistor connected to the touch electrode block and the touch electrode block is connected to the storage capacitor via the source electrode and the drain electrode of the switching transistor and is chargeable by the storage capacitor;

the electrode plate of the storage capacitor is connected to the second control chip through a via hole;

the second control chip is configured to, before switching to the touch detection period, output a charging signal to charge the storage capacitor, such that the storage capacitor has a preset voltage; and

the first control chip is configured to, before switching to a touch detection period, output a first control signal to the gate electrode of the switching transistor to control the switching transistor to be turned off, and when switching to a display period, output a second control signal to the gate electrode of the switching transistor to control the switching transistor to be turned on so that the touch electrode block is conducted with the storage capacitor and is charged by the storage capacitor having the preset voltage;

the method comprising;

before switching to a touch detection period, outputting a charging signal, by the second control chip, to charge the storage capacitor, such that the storage capacitor has the preset voltage, and outputting a first control signal, by the first control chip, to control the switching transistor to be turned off;

after switching to the touch detection period, transmitting a touch scan signal, by the touch wire, to the touch electrode block, and transmitting a touch signal generated by a touch electrode block at a position where a touch occurs, by the touch wire, to the touch control chip; and

when switching to a display period, outputting a second control signal, by the first control chip, to control the switching transistor to be turned on.

18. The driving method of claim 17, further comprising:

after switching to the display period, when the voltage of the touch electrode block is equal to the voltage of the storage capacitor, outputting the first control signal, by the first control chip, to control the switching transistor to be turned off, and outputting a turn-off signal, by the second control chip, to stop charging the storage capacitor.

19. The driving method of claim 18, further comprising:

after switching to the display period, when the voltage of the touch electrode block is the common voltage, outputting a charging signal, by the second control chip, to charge the storage capacitor, such that the storage capacitor has the preset voltage.