Touch Detection Method and Touch Detection Device and Touch Display Device

• US 20110193807A1
• Filed: 01/30/2011
• Published: 08/11/2011
• Est. Priority Date: 02/09/2010
• Status: Abandoned Application

• Current Assignee: Novatek Microelectronics Corporation (Novatek Microelectronics Corp Limited)
• Original Assignee: Novatek Microelectronics Corporation (Novatek Microelectronics Corp Limited)
• Inventors: Lin, Ching-Chun, Huang, Hao-Jan
• Application Number:
  US13/017,031
• Publication Number:
  US 20110193807A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display

Abstract

A touch detection method is utilized for detecting touch events in a flat panel display. The flat panel display includes a plurality of source lines and a plurality of gate lines perpendicular to the plurality of source lines. The touch detection method includes sequentially detecting waveforms of the plurality of source lines when receiving a plurality of source driving signals, and when a gate line of the plurality of gate lines receives a gate driving signal, to generate a plurality of detection results, and determining a status of a touch event according to the plurality of detection results and position of the gate line relative to the plurality of gate lines.

Claims

1. A touch detection method, for detecting touch events in a flat panel display, the flat panel display comprising a plurality of source lines and a plurality of gate lines perpendicular to the plurality of source lines, the touch detection method comprising:

sequentially detecting waveforms of the plurality of source lines when receiving a plurality of source driving signals, and when a gate line of the plurality of gate lines receives a gate driving signal, to generate a plurality of detection results; and

determining a status of a touch event according to the plurality of detection results and position of the gate line relative to the plurality of gate lines.

2. The touch detection method of claim 1, wherein the step of determining the status of the touch event according to the plurality of detection results and position of the gate line relative to the plurality of gate lines comprises:

sequentially comparing the plurality of detection results with waveforms of the plurality of source lines when the plurality of source driving signals are generated, to generate a plurality of comparison results; and

determining the status of the touch event according to the plurality of comparison results.

3. The touch detection method of claim 2, wherein the step of determining the status of the touch event according to the plurality of comparison results is determining that the touch event occurs on an intersection of a source line corresponding to a comparison result and the gate line when a comparison result among the plurality of comparison results is greater than a predetermined value.

4. The touch detection method of claim 2, wherein the step of determining the status of the touch event according to the plurality of comparison results is determining that the touch event does not occur when the plurality of comparison results are smaller than a predetermined value.

5. The touch detection method of claim 2, wherein the step of determining the status of the touch event according to the plurality of comparison results is determining that an erroneous decision occurs when a predetermined amount of comparison results among the plurality of comparison results are larger than a predetermined value.

6. A touch detection device, for detecting touch events in a flat panel display, the flat panel display comprising a plurality of source lines and a plurality of gate lines perpendicular to the plurality of source lines, the touch detection device comprising:

a touch detection unit, for sequentially detecting waveforms of the plurality of source lines when receiving a plurality of source driving signals, and for when a gate line of the plurality of gate lines receives a gate driving signal, to generate a plurality of detection results; and

a determination module, for determining a status of a touch event according to the plurality of detection results and position of the gate line relative to the plurality of gate lines.

7. The touch detection device of claim 6, wherein the determination module comprises:

a comparison unit, for sequentially comparing the plurality of detection results with waveforms of the plurality of source lines when the plurality of source driving signals are generated, to generate a plurality of comparison results; and

a logic unit, for determining the status of the touch event according to the plurality of comparison results.

8. The touch detection device of claim 7, wherein the logic unit determines that the touch event occurs on an intersection of a source line corresponding to a comparison result and the gate line, when a comparison result among the plurality of comparison results is greater than a predetermined value.

9. The touch detection device of claim 7, wherein the logic unit determines that the touch event does not occur when the plurality of comparison results are smaller than a predetermined value.

10. The touch detection device of claim 7, wherein the logic unit determines that an erroneous decision occurs when a predetermined amount of comparison results among the plurality of comparison results are larger than a predetermined value.

11. A flat display device having display and touch functions, comprising:

a display panel, comprising a plurality of pixel units, a plurality of source lines, and a plurality of gate lines perpendicular to the plurality of source lines, each pixel unit formed at an intersection of a source line and a gate line;

an image driving module, for outputting a plurality of control signals and a plurality of image data to the plurality of gate lines according to an image data, to drive the plurality of pixel units to display images; and

a touch detection device, comprising;

a touch detection unit, for sequentially detecting waveforms of the plurality of source lines when receiving a plurality of source driving signals, and when a gate line of the plurality of gate lines receives a gate driving signal, to generate a plurality of detection results; and

a determination module, for determining a status of a touch event according to the plurality of detection results and position of the gate line relative to the plurality of gate lines.

12. The flat display device of claim 11, wherein the determination module comprises:

a comparison unit, for sequentially comparing the plurality of detection results with waveforms of the plurality of source lines when the plurality of source driving signals are generated, to generate a plurality of comparison results; and

a logic unit, for determining the status of the touch event according to the plurality of comparison results.

13. The flat display device of claim 12, wherein the logic unit determines that the touch event occurs on an intersection of a source line corresponding to a comparison result and the gate line, when a comparison result among the plurality of comparison results is greater than a predetermined value.

14. The flat display device of claim 12, wherein the logic unit determines that the touch event does not occur when the plurality of comparison results are smaller than a predetermined value.

15. The flat display device of claim 12, wherein the logic unit determines that an erroneous decision occurs when a predetermined amount of comparison results among the plurality of comparison results are larger than a predetermined value.