TOUCH PANEL WITH DISCHARGING FUNCTION

• US 20100321320A1
• Filed: 06/17/2010
• Published: 12/23/2010
• Est. Priority Date: 06/17/2009
• Status: Abandoned Application

• Current Assignee: Sitronix Technology Corporation
• Original Assignee: Sitronix Technology Corporation
• Inventors: HUNG, CHIH-DE, YEH, CHENG-CHUNG, KUO, TING-LONG
• Application Number:
  US12/817,521
• Publication Number:
  US 20100321320A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/04166 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 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

The present invention relates to a touch panel with a discharging function, which comprises a scanning bus, a sensing bus, a control unit, and a discharging circuit. The scanning bus is used for scanning a touch frame. The sensing bus interleaves with the scanning bus, and senses at least a touched location on the touch frame. The control unit is coupled to the scanning bus and the sensing bus 20′ for controlling them. The discharging circuit is coupled to the sensing bus or/and the scanning bus, and is controlled by the control unit for releasing the charges at the touched location or/and on the relevant path between the touched location and the buses. Thereby, by using a discharging circuit for releasing charges on the parasitic capacitor, the parasitic capacitance effect is avoided. Hence, the sensing accuracy of the touch panel is increased.

Claims

1. A touch panel with a discharging function, comprising:

a scanning bus, coupled to a plurality of scanning lines, and used for scanning a touch frame;

a sensing bus, coupled to a plurality of sensing lines, said plurality of sensing lines interleaving with said plurality of scanning lines, respectively, and said plurality of sensing lines sensing at least a touched location on said touch frame;

a control unit, coupled to said scanning bus and said sensing bus for controlling said scanning bus and said sensing bus; and

a discharging circuit, coupled to said sensing bus or/and said scanning bus, and controlled by said control unit for releasing the charges at said touched location.

2. The touch panel with a discharging function of claim 1, wherein said control unit controls said discharging circuit to release the charges at said touched location or/and on the relevant path between said touched location and said scanning bus or/and said sensing bus according to a discharge timing.

3. The touch panel with a discharging function of claim 2, wherein said control unit can adjust the timing of discharge for controlling the time said discharging circuit discharges.

4. The touch panel with a discharging function of claim 1, wherein before said control unit scans said touch frame, said control unit controls said discharging circuit of said scanning bus or/and said sensing bus to release the charges at said touched location or/and on the relevant path between said touched location and said scanning bus or/and said sensing bus.

5. The touch panel with a discharging function of claim 1, wherein after said control unit scans said touch frame, said control unit controls said discharging circuit of said scanning bus or/and said sensing bus to release the charges at said touched location or/and on the relevant path between said touched location and said scanning bus or/and said sensing bus.

6. The touch panel with a discharging function of claim 1, wherein before said sensing bus senses said touched location, said control unit controls said discharging circuit to release the charges at said touched location and on the relevant path between said touched location and said scanning bus or/and said sensing bus.

7. The touch panel with a discharging function of claim 1, wherein after said sensing bus senses said touched location, said control unit controls said discharging circuit to release the charges at said touched location or/and on the relevant path between said touched location and said scanning bus or/and said sensing bus.

8. The touch panel with a discharging function of claim 1, wherein before said scanning bus scans said touch frame, said control unit controls said discharging circuit to release the charges at said touched location.

9. The touch panel with a discharging function of claim 1, wherein when said scanning bus scans said touch frame, said control unit controls said discharging circuit to release the charges on the un-scanned scanning lines of said scanning bus.

10. The touch panel with a discharging function of claim 1, wherein when said scanning bus scans said touch frame, said control unit controls said discharging circuit to release the charges on the un-sensed sensing lines of said sensing bus.

11. The touch panel with a discharging function of claim 1, wherein when said scanning bus scans said touch frame, said control unit controls said discharging circuit to release the charges on the scanning lines of said scanning bus being scanned.

12. The touch panel with a discharging function of claim 1, wherein when said scanning bus scans said touch frame, said control unit controls said discharging circuit to release the charges on the sensing lines of said sensing bus being sensed.

13. The touch panel with a discharging function of claim 1, wherein after said scanning bus completes a scanning cycle, said control unit controls said discharging circuit to release the charges at said touched location or/and on the relevant path between said touched location and said scanning bus or/and said sensing bus.

14. The touch panel with a discharging function of claim 1, wherein after said sensing bus completes a scanning cycle, said control unit controls said discharging circuit to release the charges at said touched location or/and on the relevant path between said touched location and said scanning bus or/and said sensing bus.

15. The touch panel with a discharging function of claim 1, wherein said discharging circuit includes a switch.

16. The touch panel with a discharging function of claim 15, wherein said switch is a field-effect transistor or a bipolar junction transistor.

17. The touch panel with a discharging function of claim 1, wherein said plurality of scanning lines and said plurality of sensing lines are conductive films.

18. The touch panel with a discharging function of claim 17, wherein said conductive film is a transparent conductive oxide film.