Method and device for automatically calibrating touch detection

• US 8,884,631 B2
• Filed: 05/23/2011
• Issued: 11/11/2014
• Est. Priority Date: 05/31/2010
• Status: Active Grant

• Current Assignee: eGalax_eMPIA Technology Inc.
• Original Assignee: eGalax_eMPIA Technology Inc.
• Inventors: Chang, Chin-Fu, Lee, Cheng-Han, Tang, Chi-Hao
• Primary Examiner(s): Nguyen, Tung X
• Application Number:
  US13/113,537
• Publication Number:
  US 20110291669A1
• Time in Patent Office: 1,268 Days
• US Class Current: 324/601
• CPC Class Codes: G06F 3/04186 Touch location disambiguation

Abstract

A method and device for automatically calibrating touch detection is disclosed. The present invention includes providing a sensing layer including a plurality of sensors, and each sensor senses a sensing range, and the sensing ranges of the sensors intersecting each other to form a crossing array; continuously detecting signals of the sensors as a detection signal set; performing update of an initial signal set based on the detection signal set; and when a default signal set does not match the initial signal set and the default signal set matches the detection signal set, performing update of the initial signal set.

Claims

1. A device for automatically calibrating touch detection, comprising:

a sensing layer including a plurality of sensors, each sensor sensing a sensing range, and the sensing ranges of the sensors intersecting each other to form a crossing array; and

a sensing unit including;

a sensing circuit for performing the operations of;

continuously detecting signals of the sensors as a detection signal set; and

when a default signal set does not match an initial signal set and the default signal set matches the detection signal set, performing update of the initial signal set.

2. The device for automatically calibrating touch detection according to claim 1, wherein the sensing unit further includes determining a location of at least one external object based on the detection signal set when the default signal set does not match the initial signal set and the default signal set does not match the detection signal set.

3. The device for automatically calibrating touch detection according to claim 1, wherein the sensing unit further includes determining a location of at least one external object based on the detection signal set when the default signal set matches the initial signal set.

4. The device for automatically calibrating touch detection according to claim 1, wherein the update of the initial signal set is performed continuously until the default signal set matches the initial signal set.

5. The device for automatically calibrating touch detection according to claim 1, wherein matching of the default signal set and the initial signal set includes matching of a value representing the default signal set and a value representing the initial signal set and/or matching of the default signal set and the detection signal set includes matching of a value representing the default signal set and a value representing the detection signal set.

6. The device for automatically calibrating touch detection according to claim 1, wherein the sensing layer includes a plurality of first sensors and a plurality of second sensors, the first sensors and the second sensors overlapping at a plurality of intersecting points.

7. The device for automatically calibrating touch detection according to claim 1, wherein each value of the detection signal set corresponds to a differential signal of a different pair of sensors, and a pair of sensors to which each value corresponds have at least one sensor that is different from another pair of sensors to which another value corresponds, wherein the detection signal set includes at least one zero-crossing point when the at least one external object touches the sensors.

8. The device for automatically calibrating touch detection according to claim 1, wherein each value of the detection signal set corresponds to a difference between differential signals of two pairs of sensors among three sensors, and three sensors to which each value corresponds have at least one sensor that is different from three sensors to which another value corresponds, wherein the detection signal set include an even number of zero-crossing points when the at least one external object touches the sensors.

9. The device for automatically calibrating touch detection according to claim 8, wherein the three different sensors among the sensors are not adjacent to one another.

10. The device for automatically calibrating touch detection according to claim 1, wherein the sensing unit includes a storage element for storing the default signal set and the initial signal set.

11. A method for automatically calibrating touch detection, comprising:

providing a sensing layer including a plurality of sensors, each sensor sensing a sensing range, and the sensing ranges of the sensors intersecting each other to form a crossing array;

continuously detecting signals of the sensors as a detection signal set;

performing update of an initial signal set based on the detection signal set; and

when a default signal set does not match the initial signal set and the default signal set matches the detection signal set, performing update of the initial signal set.

12. The method for automatically calibrating touch detection according to claim 11, further comprising determining a location of at least one external object based on the detection signal set when the default signal set does not match the initial signal set and the default signal set does not match the detection signal set.

13. The method for automatically calibrating touch detection according to claim 11, further comprising determining a location of at least one external object based on the detection signal set when the default signal set matches the initial signal set.

14. The method for automatically calibrating touch detection according to claim 11, wherein the update of the initial signal set is performed continuously until the default signal set matches the initial signal set.

15. The method for automatically calibrating touch detection according to claim 11, wherein matching of the default signal set and the initial signal set includes matching of a value representing the default signal set and a value representing the initial signal set and/or matching of the default signal set and the detection signal set includes matching of a value representing the default signal set and a value representing the detection signal set.

16. The method for automatically calibrating touch detection according to claim 11, wherein the sensing layer includes a plurality of first sensors and a plurality of second sensors, the first sensors and the second sensors overlapping at a plurality of intersecting points.

17. The method for automatically calibrating touch detection according to claim 11, wherein each value of the detection signal set corresponds to a differential signal of a different pair of sensors, and a pair of sensors to which each value corresponds have at least one sensor that is different from another pair of sensors to which another value corresponds, wherein the detection signal set includes at least one zero-crossing point when the at least one external object touches the sensors.

18. The method for automatically calibrating touch detection according to claim 11, wherein each value of the detection signal set corresponds to a difference between differential signals of two pairs of sensors among three sensors, and three sensors to which each value corresponds have at least one sensor that is different from three sensors to which another value corresponds, wherein the detection signal set include an even number of zero-crossing points when the at least one external object touches the sensors.

19. The method for automatically calibrating touch detection according to claim 18, wherein the three different sensors among the sensors are not adjacent to one another.