DRIVING CIRCUIT AND TOUCH DISPLAY CAPABLE OF ENABLING A DISPLAY STRUCTURE TO PROVIDE A TOUCH FUNCTION

• US 20140160058A1
• Filed: 02/26/2013
• Published: 06/12/2014
• Est. Priority Date: 12/12/2012
• Status: Active Grant

• Current Assignee: IC Array Micro and Nano Electronics Company Limited
• Original Assignee: Rich IP Technology, Inc.
• Inventors: CHEN, Han-Chang, TU, Yen-Hung, CHIA, Chung-Lin, WU, Chih-Wen
• Granted Patent: US 9,430,076 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• 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 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/044 by capacitive means

Abstract

A driving circuit capable of enabling a display structure to provide a touch function, including: a first multiplexing interface for coupling with multiple gate driving lines; a second multiplexing interface for coupling with at least one storage capacitor driving line; a third multiplexing interface for coupling with multiple source driving lines; a fourth multiplexing interface for coupling with multiple transparent electrodes; and a control unit for driving the gate driving lines via the first multiplexing interface to form a capacitive network on a TFT display structure, and performing a capacitive touch detection procedure on the capacitive network via an interface selected from a group consisting of the second multiplexing interface, the third multiplexing interface, the fourth multiplexing interface, and any combination thereof.

Claims

1. A driving circuit capable of enabling a display structure to provide a touch function, the driving circuit comprising:

a first multiplexing interface for coupling with a plurality of gate signal lines;

a second multiplexing interface for coupling with a plurality of source signal lines;

a third multiplexing interface for coupling with a plurality of transparent electrode signal lines; and

a control unit for driving said gate signal lines via said first multiplexing interface to form a capacitive network on a TFT display structure, and performing a capacitive touch detection procedure on said capacitive network via an interface selected from a group consisting of said second multiplexing interface, said third multiplexing interface, and any combination thereof.

2. The driving circuit capable of enabling a display structure to provide a touch function as claim 1, further comprising a fourth multiplexing interface for coupling with at least one storage capacitor signal line, and said control unit further uses said fourth multiplexing interface to execute said capacitive touch detection procedure.

3. The driving circuit capable of enabling a display structure to provide a touch function as claim 1, further comprising an output port for transmitting touch detection data to a central processing unit.

4. The driving circuit capable of enabling a display structure to provide a touch function as claim 3, further comprising an input port for receiving display data from said central processing unit.

5. The driving circuit capable of enabling a display structure to provide a touch function as claim 4, further comprising a communication port for communicating with said central processing unit.

6. The driving circuit capable of enabling a display structure to provide a touch function as claim 2, wherein said control unit comprises:

a gate driver unit coupled with said first multiplexing interface;

a pixel driver unit coupled with said second multiplexing interface;

a capacitive touch driver unit coupled with said second multiplexing interface, said third multiplexing interface, and said fourth multiplexing interface respectively; and

a timing control unit coupled with said gate driver unit, said pixel driver unit, and said capacitive touch driver unit respectively.

7. The driving circuit capable of enabling a display structure to provide a touch function as claim 1, wherein said capacitive touch detection procedure is one procedure selected from a group consisting of a self-capacitive touch detection procedure, a mutual-capacitive touch detection procedure, and any combination thereof.

8. A touch display using a display structure to provide a touch function, the touch display comprising:

a TFT display structure having a plurality of gate driving lines, at least one storage capacitor driving line, a plurality of source driving lines, and a plurality of transparent electrodes, wherein said transparent electrodes oppose a plurality of pixel electrodes, and a display material layer is located between said transparent electrodes and said pixel electrodes; and

a driving circuit, comprising;

a gate driver unit coupled with said gate driving lines;

a touch/display driver assembly having a plurality of touch/display driver units connected in series, each of said touch/display driver units having;

a second multiplexing interface coupled with said source driving lines; and

a third multiplexing interface coupled with said transparent electrodes; and

a control unit using said gate driver unit to drive said gate driving lines to form a capacitive network on said TFT display structure, and using said touch/display driver assembly to perform a capacitive touch detection procedure on said capacitive network.

9. The touch display using a display structure to provide a touch function as claim 8, wherein each of said touch/display driver units further comprises a fourth multiplexing interface for coupling with at least one storage capacitor driving line.

10. The touch display using a display structure to provide a touch function as claim 8, wherein said driving circuit further comprises an output port for transmitting touch detection data to a central processing unit.

11. The touch display using a display structure to provide a touch function as claim 10, wherein said driving circuit further comprises an input port for receiving display data from said central processing unit.

12. The touch display using a display structure to provide a touch function as claim 11, wherein said driving circuit further comprises a communication port for communicating with said central processing unit.

13. The touch display using a display structure to provide a touch function as claim 8, wherein said control unit comprises a timing control unit coupled with said gate driver unit and said touch/display driver assembly respectively.

14. The touch display using a display structure to provide a touch function as claim 8, wherein said capacitive touch detection procedure is a multi-stage detection procedure having multiple sub procedures, and each of said sub procedures is one procedure selected from a group consisting of a self-capacitive touch detection procedure, a mutual-capacitive touch detection procedure, and any combination thereof.

15. The touch display using a display structure to provide a touch function as claim 8, wherein said display material layer is a liquid display layer or an electronic paper display layer.

16. The touch display using a display structure to provide a touch function as claim 8, wherein said first multiplexing interface, said second multiplexing interface, and said third multiplexing interface are located on an integrated circuit or on said TFT display structure.

17. A driving circuit capable of enabling a display structure to provide a touch function, the driving circuit comprising:

a first multiplexing interface for coupling with a plurality of gate signal lines;

a second multiplexing interface for coupling with a plurality of source signal lines;

a third multiplexing interface for coupling with a plurality of transparent electrodes; and

a control unit for driving said gate signal lines via said first multiplexing interface to form a capacitive network on a TFT display structure, and performing a capacitive touch detection procedure on said capacitive network via an interface selected from a group consisting of said second multiplexing interface, said third multiplexing interface, and any combination thereof, said control unit comprising;

a gate driver unit coupled with said first multiplexing interface;

a pixel driver unit coupled with said second multiplexing interface;

a capacitive touch driver unit coupled with said second multiplexing interface and said third multiplexing interface respectively; and

a digital to analog conversion unit for providing a first analog voltage to said pixel driver unit, and a second analog voltage to said capacitive touch driver unit.

18. The driving circuit capable of enabling a display structure to provide a touch function as claim 17, further comprising an output port for transmitting touch detection data to a central processing unit.

19. The driving circuit capable of enabling a display structure to provide a touch function as claim 18, further comprising an input port for receiving display data from said central processing unit.

20. The driving circuit capable of enabling a display structure to provide a touch function as claim 19, further comprising a communication port for communicating with said central processing unit.

21. The driving circuit capable of enabling a display structure to provide a touch function as claim 17, wherein said control unit further comprises a timing control unit coupled with said gate driver unit, said pixel driver unit, and said capacitive touch driver unit respectively.

22. The driving circuit capable of enabling a display structure to provide a touch function as claim 17, wherein said capacitive touch detection procedure is one procedure selected from a group consisting of a self-capacitive touch detection procedure, a mutual-capacitive touch detection procedure, and any combination thereof.

23. The driving circuit capable of enabling a display structure to provide a touch function as claim 17, wherein said first analog voltage differs from a common voltage by a first voltage difference, and an absolute value of said first voltage difference ranges between a first voltage and a second voltage;

and said second analog voltage differs from said common voltage by a second voltage difference, and an absolute value of said second voltage difference ranges between a third voltage and a fourth voltage, wherein said second voltage is higher than said first voltage, and said fourth voltage is higher than said third voltage.