Touch point positioning and detecting circuit for a touch panel, touch panel and display device

• US 9,323,408 B2
• Filed: 04/08/2013
• Issued: 04/26/2016
• Est. Priority Date: 02/28/2013
• 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., Hefei BOE Optoelectronics Technology Company Limited (BOE Technology Group Co., Ltd.)
• Inventors: Gu, Xiaofang, Hu, Ming
• Primary Examiner(s): Davis, David D
• Application Number:
  US14/347,932
• Publication Number:
  US 20150029421A1
• Time in Patent Office: 1,114 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G01B 11/14 for measuring distance or clearance between spaced objects or spaced apertures G01B11/26 takes precedence; rangefinders G01C3/00
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/042 by opto-electronic means

Abstract

A touch point positioning and detecting circuit for a touch panel and a touch panel with a display device to achieve an optical type in-cell touch panel. The touch point positioning and detecting circuit comprises a touch sensing sub-circuit, a detecting sub-circuit which is connected with the touch sensing sub-circuit, a first touch driving electrode line and a second touch driving electrode line. The touch sensing sub-circuit comprises a capacitor, a first switch transistor and a second switch transistor. A gate and a source of the first switch transistor are connected with the first touch driving electrode line, and a drain of the first switch transistor is connected with a drain of the second switch transistor. A source of the second switch transistor is connected with the detecting sub-circuit, and a gate of the second switch transistor is connected with the second touch driving electrode line. One end of the capacitor is connected with the drain of the first switch transistor and the other end of the capacitor is connected with an electrode line providing a high level voltage.

Claims

1. A touch point positioning and detecting circuit for a touch panel, comprising:

a touch sensing sub-circuit, a detecting sub-circuit which is connected with the touch sensing sub-circuit and is configured to determine the position of a touch point according to a touch signal outputted by the touch sensing sub-circuit, and a first touch driving electrode line and a second touch driving electrode line;

the touch sensing sub-circuit comprises;

a capacitor, a first switch transistor and a second switch transistor;

a gate and a source of the first switch transistor being connected with the first touch driving electrode line, and a drain of the first switch transistor being connected with a drain of the second switch transistor;

a source of the second switch transistor being connected with the detecting sub-circuit, and a gate of the second switch transistor being connected with the second touch driving electrode line;

one end of the capacitor being connected with the drain of the first switch transistor and the other end of the capacitor being connected with an electrode line providing a high level voltage;

wherein, the first switch transistor is an optical switch transistor, and

wherein, the first touch driving electrode line and the second touch driving electrode line are gate lines.

2. The circuit according to claim 1, wherein, the electrode line providing the high level voltage is the first touch driving electrode line.

3. The circuit according to claim 2, wherein, the first touch driving electrode line and the second touch driving electrode line are gate lines.

4. The circuit according to claim 2, wherein, the first switch transistor and the second switch transistor are N type transistors.

5. The circuit according to claim 2, wherein, the detecting sub-circuit comprises:

an amplifier, a capacitor connected across the reverse input end and the output end of the amplifier,and a switch connected across the reverse input end and the output end of the amplifier, and the source of the second switch transistor is connected with the reverse input end of the amplifier.

6. The circuit according to claim 1, wherein, the electrode line providing the high level voltage is a common electrode line.

7. The circuit according to claim 6, wherein, the first touch driving electrode line and the second touch driving electrode line are gate lines.

8. The circuit according to claim 6, wherein, the first switch transistor and the second switch transistor are N type transistors.

9. The circuit according to claim 6, wherein, the detecting sub-circuit comprises:

an amplifier, a capacitor connected across the reverse input end and the output end of the amplifier, and a switch connected across the reverse input end and the output end of the amplifier, and the source of the second switch transistor is connected with the reverse input end of the amplifier.

10. The circuit according to claim 1, wherein, the first switch transistor and the second switch transistor are N type transistors.

11. The circuit according to claim 10, wherein, the detecting sub-circuit comprises:

an amplifier, a capacitor connected across the reverse input end and the output end of the amplifier, and a switch connected across the reverse input end and the output end of the amplifier, and the source of the second switch transistor is connected with the reverse input end of the amplifier.

12. The circuit according to claim 1, wherein, the first switch transistor and the second switch transistor are N type transistors.

13. The circuit according to claim 1, wherein, the detecting sub-circuit comprises:

an amplifier, a capacitor connected across the reverse input end and the output end of the amplifier,and a switch connected across the reverse input end and the output end of the amplifier, and the source of the second switch transistor is connected with the reverse input end of the amplifier.

14. The circuit according to claim 1, wherein, the detecting sub-circuit comprises:

an amplifier, a capacitor connected across the reverse input end and the output end of the amplifier, and a switch connected across the reverse input end and the output end of the amplifier, and the source of the second switch transistor is connected with the reverse input end of the amplifier.

15. A touch pan&

comprising the touch point positioning and detecting circuit according to any of claim 1.

16. The touch panel according to claim 15, wherein, the detecting circuit is located in a display area of the sub-pixel units of an array substrate.

17. A display device comprising the touch panel according to claim 15.