Touch panel and noise reducing method therefor

• US 8,493,343 B2
• Filed: 09/22/2009
• Issued: 07/23/2013
• Est. Priority Date: 04/22/2009
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Goo, Nam-Hee, Choi, Hee-Jin, Park, Hee-Bum, Lee, Byoung-Jun, Koh, Jai-Hyun, You, Bong-Hyun
• Primary Examiner(s): Tzeng, Fred
• Application Number:
  US12/564,338
• Publication Number:
  US 20100271319A1
• Time in Patent Office: 1,400 Days
• Field of Search: 345/173, 345/174
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A method for reducing noise of a touch panel includes: generating a detection signal including at least one contact region; generating a combination noise region including at least a portion of the at least one contact region; and generating a final detection signal. The generating the final detection signal includes removing the combination noise region from the detection signal.

Claims

1. A method for reducing noise of a touch panel, the method comprising:

generating a detection signal having at least two pulses corresponding to at least one contact portion of the touch panel;

unifying adjacent pulses of the at least two pulses to constitute a wider pulse than each pulse of the adjacent pulses before the unification when an interval between the adjacent pulses is less than an effective-noise distance; and

generating a final detection signal by removing the unified pulses from the detection signal.

2. The method of claim 1, wherein

the generating the final detection signal includes:

determining whether a width of the wider pulse and a width of a remaining pulse not included in the wider pulse are within an effective width range; and

removing the wider pulse or the remaining pulse when the wider pulse or the remaining pulse is not within the effective width range.

3. The method of claim 2, wherein,

when the width of the wider pulse and the width of the remaining pulse both are within the effective width range,

the generating of the final detection signal includes:

determining a position of a pulse corresponding to an effective contact portion in the final detection signal of a previous frame or a next frame; and

removing on of the wider pulse and the remaining pulse that is further from the position of the pulse corresponding to the effective contact portion of the previous frame or the next frame.

4. The method of claim 1, wherein

the detection signal includes an X direction detection signal or a Y direction detection signal, and

the X direction is substantially perpendicular to the Y direction.

5. The method of claim 1, wherein

the generating the final detection signal includes:

determining whether a width of the wider pulse and a width of a remaining pulse not included in wider pulse is within an effective width range; and

removing the wider pulse or the remaining pulse when the wider pulse or the remaining pulse is not within the effective width range.

6. The method of claim 5, wherein,

when the width of the wider pulse and the width of the remaining pulse both are within the effective width range,

the generating of the final detection signal includes:

determining a position of a pulse corresponding to an effective contact portion in the final detection signal of a previous frame or a next frame; and

removing one of the wider pulse and the remaining pulse that is further from the position of the pulse corresponding to the effective contact portion of the previous frame or the next frame.

7. The method of claim 1, wherein

the detection signal includes an X direction detection signal or a Y direction detection signal, and

the X direction is substantially perpendicular to the Y direction.

8. The method of claim 1, wherein the detection signal and the final detection signal include a same remaining pulse.

9. A touch panel comprising:

a touch display panel including sensing units;

transverse sensing data lines and longitudinal sensing data lines, the transverse sensing data lines and the longitudinal sensing data lines connected to the sensing units; and

a sensing signal processor connected to the transverse sensing data lines and the longitudinal sensing data lines and including a noise removing unit, wherein

the sensing signal processor generates a detection signal having at least two pulses corresponding to at least one contact portion of the touch display panel based on at least one of a sensing data signal from the transverse sensing data lines and a sensing data signal from the longitudinal sensing data lines, and

the noise removing unit unifies adjacent pulses of the at least two pulses to constitute a wider pulse than each pulse of the adjacent pulses before the unification when an interval between the adjacent pulses is less than an effective-noise distance and generates a final detection signal by removing the unified pulses from the detection signal.

10. The touch panel of claim 9, wherein

the noise removing unit generates the final detection signal by determining whether a width of the wider pulse and a width of a remaining pulse not included in the wider pulse are within an effective width range, and removing the wider pulse or the remaining pulse when the wider pulse or the remaining pulse is not within the effective width range.

11. The touch panel of claim 10, wherein,

when the width of the wider pulse and the width of the remaining pulse both are within the effective width range, the noise removing unit removes one of the wider pulse and the remaining pulse that is further from a position of a pulse corresponding to an effective contact portion in the final detection signal of a previous frame or a next frame.

12. The touch panel of claim 9, wherein

the detection signal includes an X direction detection signal or a Y direction detection signal, and

the X direction is substantially perpendicular to the Y direction.

13. The touch panel of claim 9, wherein

the noise removing unit determines whether a width of the wider pulse and a width of a remaining pulse not included in the wider pulse are within an effective width range, and removes the wider pulse or the remaining pulse when the wider pulse or the remaining pulse h is not within the effective width range.

14. The touch panel of claim 13, wherein,

when the width of the wider pulse and the width of the remaining pulse both are within the effective width range, the noise removing unit removes one of the wider pulse and the remaining pulse that is further from a position of a pulse corresponding to an effective contact portion in the final detection signal of a previous frame or a next frame.

15. The touch panel of claim 9, wherein

the detection signal includes an X direction detection signal or a Y direction detection signal, and

the X direction is substantially perpendicular to the Y direction.

16. The touch panel of claim 9, wherein

the detection signal and the final detection signal include a same remaining pulse.