METHOD OF SCANNING TOUCH PANEL

• US 20100309171A1
• Filed: 08/25/2009
• Published: 12/09/2010
• Est. Priority Date: 06/08/2009
• Status: Abandoned Application

• Current Assignee: Chunghwa Picture Tubes Limited
• Original Assignee: Chunghwa Picture Tubes Limited
• Inventors: Liu, Chia-Lin, Mo, Chi-Neng, Chen, Chih-Chung, Hsieh, Ming-Ta, Yin, Hsueh-Fang, Lin, Chien-Ming
• Application Number:
  US12/546,690
• Publication Number:
  US 20100309171A1
• Time in Patent Office: Days
• US Class Current: 345/204
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/041661 using detection at multiple resolutions, e.g. coarse and fine scanning; using detection within a limited area, e.g. object tracking window
• CPC Class Codes: G06F 3/044 by capacitive means

Abstract

A method of scanning a touch panel is provided. The present method includes following steps. First, a scan area is defined according to the coordinates of a detected touch signal. Next, the scan area is scanned during a predetermined period to detect a next touch panel. After the predetermined period, a sensing range of the touch panel is scanned to re-define the scan area. Because the scan area is smaller than the sensing range of the touch panel, the time and power consumed by the scanning operation can be both reduced by detecting the touch signals within the scan area.

Claims

1. A method of scanning a touch panel, wherein the touch panel has a plurality of sensor areas, the method comprising:

(a) scanning the touch panel to detect whether the sensor areas are touched;

(b) when a first touch signal is detected, defining a scan area according to coordinates of the first touch signal, wherein the coordinates of the first touch signal are located within the scan area, and the scan area is smaller than a sensing range of the touch panel;

(c) scanning the scan area during a predetermined period to detect whether the sensor areas within the scan area are touched; and

(d) returning to step (a) after the predetermined period to re-scan the sensor areas of the touch panel.

2. The method according to claim 1, wherein the step of defining the scan area according to the coordinates of the touch signal comprises:

when the touch signal is corresponding to a first sensor area among the sensor areas, defining the scan area according to coordinates of the first sensor area.

3. The method according to claim 2, wherein the scan area is a square area, and the first sensor area is located at a center of the scan area.

4. The method according to claim 1, wherein the step of defining the scan area according to the coordinates of the touch signal comprises:

when the touch signal is corresponding to a first sensor area and a second sensor area among the sensor areas, defining the scan area according to coordinates of the first sensor area and the second sensor area.

5. The method according to claim 4, wherein the scan area is a square area.

6. The method according to claim 5, wherein the step of defining the scan area according to the coordinates of the first sensor area and the second sensor area comprises:

obtaining a first maximum coordinate and a first minimum coordinate on a first axis and a second maximum coordinate and a second minimum coordinate on a second axis according to the coordinates of the first sensor area and the second sensor area;

defining a first border and a second border of the scan area according to the first maximum coordinate and the first minimum coordinate, wherein the first border and the second border are opposite to each other; and

defining a third border and a fourth border of the scan area according to the second maximum coordinate and the second minimum coordinate, wherein the third border and the fourth border are opposite to each other.

7. The method according to claim 6, wherein coordinate of the first border and the first maximum coordinate are different by a predetermined value, and coordinate of the second border and the first minimum coordinate are different by the predetermined value.

8. The method according to claim 1, wherein the step of defining the scan area according to the coordinates of the touch signal comprises:

when the touch signal is corresponding to a first sensor area and a second sensor area among the sensor areas, respectively defining a first sub scan area and a second sub scan area of the scan area according to coordinates of the first sensor area and the second sensor area.

9. The method according to claim 8, wherein the first sub scan area and the second sub scan area are respectively a square area, the first sensor area is located at a center of the first sub scan area, and the second sensor area is located at a center of the second sub scan area.

10. The method according to claim 1, wherein the step of defining the scan area according to the coordinates of the touch signal comprises:

when a second touch signal is detected, adjusting a position of the scan area according to coordinates of the second touch signal, wherein the coordinates of the second touch signal are located within the adjusted scan area, and the second touch signal is detected after the first touch signal.

11. The method according to claim 1, wherein the sensor areas respectively comprise a sensor element.

12. A method of scanning a touch panel, wherein the touch panel has a plurality of sensor areas, the method comprising:

(a) scanning the touch panel to detect whether the sensor areas are touched;

(b) when a first touch signal is detected, defining a scan area according to coordinates of the first touch signal, wherein when the first touch signal is corresponding to a single sensor area, the scan area is smaller than a sensing range of the touch panel, when the first touch signal is corresponding to multiple sensor areas, the scan area is equal to the sensing range of the touch panel, and the coordinates of the touch signal are located within the scan area;

(c) scanning the scan area during a predetermined period to detect whether the sensor areas within the scan area are touched; and

(d) returning to step (a) after the predetermined period to re-scan the sensor areas of the touch panel.

13. The method according to claim 12, wherein the scan area is a square area, and the first sensor area is located at a center of the scan area.

14. The method according to claim 12, wherein the sensor areas respectively comprise a sensor element.