Touch detection method and apparatus for touch display screen

• US 10,275,091 B2
• Filed: 08/18/2016
• Issued: 04/30/2019
• Est. Priority Date: 10/10/2015
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd., Chongqing BOE Optoelectronics Technology Co., Ltd. (BOE Technology Group Co., Ltd.)
• Original Assignee: BOE Technology Group Co., Ltd., Chongqing BOE Optoelectronics Technology Co., Ltd. (BOE Technology Group Co., Ltd.)
• Inventors: Xu, Bo, Hou, Shuai, Wang, Wu, Gao, Xianyong, Liang, Lisheng, Fu, Siqing, Hsu, Yih Jen, Shang, Fei, Qiu, Haijun
• Primary Examiner(s): Chow, Van N
• Application Number:
  US15/503,890
• Publication Number:
  US 20170277352A1
• Time in Patent Office: 985 Days
• CPC Class Codes: G06F 1/3262 Power saving in digitizer or tablet
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G09G 2310/0251 Precharge or discharge of pixel before applying new pixel voltage
• CPC Class Codes: G09G 2310/0297 Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 3/3677 suitable for active matrices only

Abstract

The disclosure provides a touch detection method and apparatus for a touch display screen, wherein a time period for scanning the touch display screen within each frame comprises a display scanning phase and a touch scanning phase, the method comprising: scanning a part of the touch display screen during the touch scanning phase to detect whether there is a touch signal; and reducing a frame rate of the touch display screen and scanning the whole touch display screen when the touch signal is detected. Accordingly, the charging time of the panel is guaranteed while displaying and touch detecting functions are multiplexed.

Claims

1. A method of detecting touch for a touch display screen, wherein a time period for scanning the touch display screen within each frame comprises a display scanning phase and a touch scanning phase, the method comprising:

scanning a part of the touch display screen during the touch scanning phase to detect whether there is a touch signal, wherein the part of the touch display screen is smaller than the whole touch display screen; and

reducing a frame rate of the touch display screen and scanning the whole touch display screen when the touch signal is detected.

2. The method according to claim 1, further comprising:

restoring the frame rate of the touch display screen and scanning the part of the touch display screen when a new touch signal is not detected during a predetermined time period for scanning the whole touch display screen.

3. The method according to claim 2, wherein scanning the part of the touch display screen comprises scanning a part of an array of rows, a part of an array of columns, a part of the arrays that are not adjacent to each other, or an area of the touch display screen.

4. The method according to claim 3, wherein scanning the part of the array of rows or columns comprises alternately scanning arrays of odd and even rows, or odd and even columns, of the touch display screen within different frames.

5. The method according to claim 1, wherein reducing the frame rate of the touch display screen comprises reducing the frame rate of the touch display screen from 60Hz to 48Hz or 50Hz.

6. The method according to claim 1, wherein the scanning is performed during blank time of each frame.

7. The method according to claim 2, wherein the predetermined time period is 10 seconds.

16. The method according to claim 2, wherein reducing the frame rate of the touch display screen comprises reducing the frame rate of the touch display screen from 60Hz to 48Hz or 50Hz.

17. The method according to claim 2, wherein the scanning is performed during blank time of each frame.

8. A touch detection apparatus for a touch display screen, wherein a time period for scanning the touch display screen comprises a display scanning phase and a touch scanning phase within each frame, the apparatus comprising:

scanning means configured to scan a part of the touch display screen during the touch scanning phase to detect a touch signal, wherein the part of the touch display screen is smaller than the whole touch display screen; and

processing means configured to reduce a frame rate of the touch display screen and control the scanning means to scan the whole touch display screen when the scanning means detects the touch signal.

9. The apparatus according to claim 8, wherein the processing means is further configured to restore the frame rate of the touch display screen and control the scanning means to scan the part of the touch display screen when a new touch signal is not detected during a predetermined time period for the scanning means to scan the whole touch display screen.

10. The apparatus according to claim 9, wherein the scanning means is configured to scan a part of an array of rows, a part of an array of columns, a part of the arrays that are not adjacent to each other, or an area of the touch display screen.

11. The apparatus according to claim 10, wherein the scanning means is configured to alternately scan arrays of odd and even rows, or odd and even columns, of the touch display screen within different frames.

12. The apparatus according to claim 8, wherein the processing means is configured to reduce the frame rate of the touch display screen from 60Hz to 48Hz or 50Hz.

13. The apparatus according to claim 8, wherein the scanning is performed during blank time of each frame.

14. The apparatus according to claim 9, wherein the predetermined time period is 10 seconds.

15. The apparatus according to claim 8, wherein the scanning means includes a Chip on Glass (COG).

18. The apparatus according to claim 9, wherein the processing means is configured to reduce the frame rate of the touch display screen from 60Hz to 48Hz or 50Hz.

19. The apparatus according to claim 9, wherein the scanning is performed during blank time of each frame.

20. The apparatus according to claim 9, wherein the scanning means includes a Chip on Glass (COG).