Touch screen scanning method, device, and system

Patent metadata

Field	Value
Publication number	US-12086355-B2
Application number	US-202117435054-A
Country	US
Kind code	B2
Filing date	May 31, 2021
Priority date	May 17, 2021
Publication date	Sep 10, 2024
Grant date	Sep 10, 2024

Abstract

A touch screen scanning method, a device, and a system are provided. Only a display scan or one touch scan is performed in each period of each frame scanning cycle, and then the display scan and/or at least one touch scan is completed in each frame scanning cycle. The display scan and the at least one touch scan do not interfere with each other during each process, thereby ensuring accuracy of a scan result and display performance of a touch screen.

First claim

What is claimed is:

1. A scanning method for a touch screen, comprising:
performing display scanning, capacitive touch scanning, and electromagnetic touch scanning within each image frame scanning cycle for the touch screen,
wherein the each image frame scanning cycle comprises at least one display period and at least one vertical blanking interval;
the display scanning is performed only within the at least one display period; and
the capacitive touch scanning and the electromagnetic touch scanning are performed respectively at different times only within the at least one vertical blanking interval.

2. The touch screen scanning method according to claim 1 , wherein each of the at least one vertical blanking interval comprises a first sub-interval and a second sub-interval that are performed sequentially;
wherein the electromagnetic touch scan is performed in the first sub-interval, and the capacitive touch scan is performed in the second sub-interval; or
the capacitive touch scan is performed in the first sub-interval and the electromagnetic touch scan is performed in the second sub-interval.

3. The touch screen scanning method according to claim 1 , wherein the electromagnetic touch scan and the capacitive touch scan are alternately performed in each of the at least one vertical blanking interval.

4. The touch screen scanning method according to claim 1 , wherein the at least one display period comprises a plurality of display periods, and the at least one vertical blanking interval comprises a plurality of vertical blanking intervals.

5. The touch screen scanning method according to claim 4 , wherein each of the plurality of vertical blanking intervals comprises a first sub-interval and a second sub-interval that are performed sequentially;
wherein the electromagnetic touch scan is performed in the first sub-interval, and the capacitive touch scan is performed in the second sub-interval; or
the capacitive touch scan is performed in the first sub-interval and the electromagnetic touch scan is performed in the second sub-interval.

6. The touch screen scanning method according to claim 4 , wherein the electromagnetic touch scan and the capacitive touch scan are alternately performed in each of the plurality of vertical blanking intervals.

7. A touch screen scanning device, wherein the scanning device comprises a chip configured to perform operations comprising:
performing display scanning, capacitive touch scanning, and electromagnetic touch scanning within each image frame scanning cycle for the touch screen,
wherein the each image frame scanning cycle comprises at least one display period and at least one vertical blanking interval;
the display scanning is performed only within the at least one display period; and
the capacitive touch scanning and the electromagnetic touch scanning are performed respectively at different times only within the at least one vertical blanking interval.

8. The touch screen scanning device according to claim 7 , wherein each of the at least one vertical blanking interval comprises a first sub-interval and a second sub-interval that are performed sequentially;
wherein the electromagnetic touch scan is performed in the first sub-interval, and the capacitive touch scan is performed in the second sub-interval; or
the capacitive touch scan is performed in the first sub-interval and the electromagnetic touch scan is performed in the second sub-interval.

9. The touch screen scanning device according to claim 7 , wherein the electromagnetic touch scan and the capacitive touch scan are alternately performed in each of the at least one vertical blanking interval.

10. The touch screen scanning device according to claim 7 , wherein the at least one display period comprises a plurality of display periods, and the at least one vertical blanking interval comprises a plurality of vertical blanking intervals.

11. The touch screen scanning device according to claim 10 , wherein each of the plurality of vertical blanking intervals comprises a first sub-interval and a second sub-interval that are performed sequentially;
wherein the electromagnetic touch scan is performed in the first sub-interval, and the capacitive touch scan is performed in the second sub-interval; or
the capacitive touch scan is performed in the first sub-interval and the electromagnetic touch scan is performed in the second sub-interval.

12. The touch screen scanning device according to claim 10 , wherein the electromagnetic touch scan and the capacitive touch scan are alternately performed in each of the plurality of vertical blanking intervals.

13. A touch screen scanning system, comprising: a timing controller, a touch signal processor, a front-end system chip, and a touch screen scanning device of claim 7 ;
wherein the touch screen scanning device is configured to acquire a touch signal of the touch screen under a timing control of the timing controller, transmit the touch signal to the touch signal processor, acquire a display signal, and transmit the display signal to a touch screen;
the timing controller is configured to control the touch screen scanning device to acquire the touch signal, and transmit a timing of the display signal to the touch screen;
the touch signal processor is configured to perform a data processing on the touch signal, and transmit the processed touch signal to the front end system ship; and
the front-end system chip is configured to transmit the display signal and the processed touch signal to the timing controller.

14. The touch screen scanning system according to claim 13 , wherein the touch signal processor comprises a filter circuit, and the filter circuit is configured to filter the touch signal.

Assignees

• Tcl China Star Optoelectronics Tech Co Ltd

Inventors

• Sun Junjie

Classifications

• G06F2203/04106

  Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection · CPC title

• G06F3/046 Primary

  by electromagnetic means · CPC title

• G06F3/044

  by capacitive means · CPC title

• G06F3/0418

  for error correction or compensation, e.g. based on parallax, calibration or alignment · CPC title

• G06F3/041

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title