TOUCH PANEL AND NOISE REDUCING METHOD THEREFOR

• US 20100271319A1
• Filed: 09/22/2009
• Published: 10/28/2010
• Est. Priority Date: 04/22/2009
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: PARK, Hee-Bum, CHOI, Hee-Jin, LEE, Byoung-Jun, KOH, Jai-Hyun, GOO, Nam-Hee, YOU, Bong-Hyun
• Granted Patent: US 8,493,343 B2
• Time in Patent Office: Days
• 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 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,

wherein the generating the final detection signal includes removing the combination noise region from the detection signal.

2. The method of claim 1, wherein

when the detection signal includes two or more contact regions, the generating the combination noise region includes:

calculating a first interval between adjacent contact regions of the two or more contact regions; and

comparing the first interval and an effective-noise distance, and

when the first interval is less than the effective-noise distance, the generating the combination noise region includes combining the adjacent contact regions.

3. The method of claim 2, wherein

the generating the final detection signal further includes determining whether a width of the combination noise region and a width of a remaining contact region not included in the combination noise region is within an effective width range, and

removing one of the combination noise region which is not within the effective width range and the remaining contact region not included in the combination noise region.

4. The method of claim 3, wherein,

when the width of the combination noise region and the width of the remaining contact region not included in the combination noise region are both within the effective width range, the generating of the final detection signal further includes:

determining a position of an effective contact region of the final detection signal of one of a previous frame and a next frame; and

removing one of the combination noise region and the remaining contact region not included in the combination noise region which is further from the effective contact region of the final detection signal of the one of the previous frame and the next frame.

5. The method of claim 2, wherein

the detection signal includes one of an X direction detection signal and a Y direction detection signal, and

the X direction is substantially perpendicular to the Y direction.

6. The method of claim 1, wherein the generating of the final detection signal further includes:

determining whether a width of the combination noise region and a width of a remaining contact region not included in the combination noise region are within an effective width range; and

removing one of the combination noise region and the remaining contact region not included in the combination noise region which is not within the effective width range.

7. The method of claim 6, wherein,

when the width of the combination noise region and the width of the remaining contact region not included in the combination noise region are both within the effective width range, the generating of the final detection signal further includes:

determining a position of an effective contact region of the final detection signal of one of a previous frame and a next frame; and

removing one of the combination noise region and the remaining contact region not included in the combination noise region which is further from the effective contact region of the final detection signal of the one of the previous frame and the next frame.

8. The method of claim 1, wherein

the detection signal includes one of an X direction detection signal and a Y direction detection signal, and

the X direction is substantially perpendicular to the Y direction.

9. The method of claim 1, wherein the detection signal and the final detection signal include a same effective contact region.

10. 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 including at least one contact region 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 generates a combination noise region including at least a portion of the at least one contact region and generates a final detection signal by removing the combination noise region from the detection signal.

11. The touch panel of claim 10, wherein,

when the detection signal includes two or more contact regions, the noise removing unit calculates a first interval between adjacent contact regions of the two or more contact regions, compares the first interval with an effective-noise distance, and generates the combination noise region by combining the adjacent contact regions when the first interval is less than the effective-noise distance.

12. The touch panel of claim 11, wherein

the noise removing unit generates the final detection signal by determining whether a width of the combination noise region and a width of a remaining contact region not included in the combination noise region are within an effective width range, and removing one of the combination noise region which is not within the effective width range and the remaining contact region not included in the combination noise region to generate the final detection signal.

13. The touch panel of claim 12, wherein,

when the width of the combination noise region and the width of the remaining contact region not included in the combination noise region are both within the effective width range, the noise removing unit removes one of the combination noise region and the remaining contact region not included in the combination noise region which is further from an effective contact region of the final detection signal of one of a previous frame and a next frame.

14. The touch panel of claim 11, 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.

15. The touch panel of claim 10, wherein

the noise removing unit determines whether a width of the combination noise region and a width of a remaining contact region not included in the combination noise region are within an effective width range, and removes one of the combination noise region and the remaining contact region not included in the combination noise region which is not within the effective width range.

16. The touch panel of claim 15, wherein,

when the width of the combination noise region and the width of the remaining contact region not included in the combination noise region are both within the effective width range, the noise removing unit removes one of the combination noise region and the remaining contact region not included in the combination noise region which is further from an effective contact region of the final detection signal of one of a previous frame and a next frame.

17. The touch panel of claim 10, 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.

18. The touch panel of claim 10, wherein

the detection signal and the final detection signal include a same effective contact region.