METHOD OF SCANNING TOUCH ON TOUCH SCREEN

• US 20120062482A1
• Filed: 03/02/2011
• Published: 03/15/2012
• Est. Priority Date: 09/14/2010
• Status: Abandoned Application

• Current Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited)
• Original Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited)
• Inventors: DING, Xiaoliang, CHEN, Yue, WANG, Lihua
• Application Number:
  US13/038,922
• Publication Number:
  US 20120062482A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 1/3215 Monitoring of peripheral devices
• CPC Class Codes: G06F 1/3262 Power saving in digitizer or tablet
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• 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
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

The present invention discloses a method of scanning a touch on a touch screen, where drive lines and sense lines of the touch screen form a matrix network. The method includes: instructing the touch screen to enter into a standby mode if no touch has been detected for a time that reaches or exceeds a preset time in a working mode of the touch screen; in the standby mode, scanning A drive lines and sensing B sense lines, said A being an integer greater than or equal to 1 and less than M, and said B being an integer greater than or equal to 1 and less than or equal to N, where M is the total number of the drive lines and N is the total number of the sense lines; instructing the touch screen to enter into the working mode if there is a current fluctuation on the sense lines which are sensed in the standby mode; in the working mode, scanning all the drive lines and sensing all the sense lines. The touch screen is instructed to enter into the energy-saving standby mode if no touch has been detected by the time that reaches or exceeds the preset time, thus achieving the purpose of reducing the power consumption of the touch screen.

Claims

1. A method of scanning a touch on a touch screen, wherein drive lines and sense lines of the touch screen form a matrix network, the method comprising:

instructing the touch screen to enter into a standby mode if no touch has been detected for a time that reaches or exceeds a preset time in a working mode of the touch screen;

in the standby mode, scanning A drive lines and sensing B sense lines, said A being an integer greater than or equal to 1 and less than M, and said B being an integer greater than or equal to 1 and less than or equal to N, wherein M is the total number of the drive lines and N is the total number of the sense lines; and

instructing the touch screen to enter into the working mode if there is a current fluctuation on the sense lines which are sensed in the standby mode;

in the working mode, scanning all the drive lines and sensing all the sense lines.

2. The method according to claim 1, wherein A is 1 in the standby mode.

3. The method according to claim 1, wherein B is 1 in the standby mode.

4. The method according to claim 1, wherein A is 1 and B is 1 in the standby mode.

5. The method according to claim 2, wherein the drive line scanned in the standby mode divides the touch screen into two portions as an upper portion and a lower portion, and the difference between the distance from the drive line to the top of the touch screen and the distance from the drive line to the bottom of the touch screen is minimum.

6. The method according to claim 4, wherein the drive line scanned in the standby mode divides the touch screen into two portions as an upper portion and a lower portion, and the difference between the distance from the drive line to the top of the touch screen and the distance from the drive line to the bottom of the touch screen is minimum.

7. The method according to claim 3, wherein the sense line sensed in the standby mode divides the touch screen into two portions as a left portion and a right portion, and the difference between the distance from the sense line to the left end of the touch screen and the distance from the sense line to the right end of the touch screen is minimum.

8. The method according to claim 4, wherein the sense line sensed in the standby mode divides the touch screen into two portions as a left portion and a right portion, and the difference between the distance from the sense line to the left end of the touch screen and the distance from the sense line to the right end of the touch screen is minimum.

9. A method of scanning a touch on a touch screen, wherein drive lines and sense lines of the touch screen form a matrix network, the method comprising:

instructing the touch screen to enter into a standby mode if no touch has been detected for a time that reaches or exceeds a preset time in a working mode of the touch screen;

in the standby mode, scanning A drive lines and sensing B sense lines, said A being an integer greater than or equal to 1 and less than or equal to M, and said B being an integer greater than or equal to 1 and less than N, wherein M is the total number of the drive lines and N is the total number of the sense lines; and

instructing the touch screen to enter into the working mode if there is a current fluctuation on the sense lines which are sensed in the standby mode;

in the working mode, scanning all the drive lines and sensing all the sense lines.

10. The method according to claim 9, wherein A is 1 in the standby mode.

11. The method according to claim 9, wherein B is 1 in the standby mode.

12. The method according to claim 9, wherein A is 1 and B is 1 in the standby mode.

13. The method according to claim 10, wherein the drive line scanned in the standby mode divides the touch screen into two portions as an upper portion and a lower portion, and the difference between the distance from the drive line to the top of the touch screen and the distance from the drive line to the bottom of the touch screen is minimum.

14. The method according to claim 12, wherein the drive line scanned in the standby mode divides the touch screen into two portions as an upper portion and a lower portion, and the difference between the distance from the drive line to the top of the touch screen and the distance from the drive line to the bottom of the touch screen is minimum.

15. The method according to claim 11, wherein the sense line sensed in the standby mode divides the touch screen into two portions as a left portion and a right portion, and the difference between the distance from the sense line to the left end of the touch screen and the distance from the sense line to the right end of the touch screen is minimum.

16. The method according to claim 12, wherein the sense line sensed in the standby mode divides the touch screen into two portions as a left portion and a right portion, and the difference between the distance from the sense line to the left end of the touch screen and the distance from the sense line to the right end of the touch screen is minimum.