Method for determining target operating frequency of stylus, and touch screen and stylus thereof

Patent metadata

Field	Value
Publication number	US-10620722-B2
Application number	US-201715697232-A
Country	US
Kind code	B2
Filing date	Sep 6, 2017
Priority date	Nov 2, 2016
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

A method for determining a target operating frequency of a stylus, and a touch screen and a stylus thereof are disclosed, pertaining to the field of touch technologies. According to embodiments of the present application, a touch screen receives a search signal sent by the stylus and detects the frequency of the search signal, and judges whether the frequency of the search signal is equal to a target operating frequency of the touch screen; and if the frequency of the search signal is equal to the target operating frequency, the touch screen sends a response signal to the stylus, whereupon the stylus determines a current operating frequency thereof as the target operating frequency. As compared with the related art, the method has the advantages such as simple use, high reliability and the like.

First claim

What is claimed is:

1. A method for determining a target operating frequency of a stylus, executed by a touch screen, the method comprising:
receiving a search signal sent by the stylus, wherein the search signal has a frequency corresponding to an operating frequency of the stylus, and detecting the frequency of the search signal;
judging whether the frequency of the search signal and a target operating frequency of the touch screen satisfy a predetermined first relationship; and
if the frequency of the search signal and the target operating frequency of the touch screen satisfy the predetermined first relationship, sending a response signal to the stylus, and enabling the stylus to acquire the target operating frequency of the touch screen according to the predetermined first relationship and the frequency of the search signal, and adjusting the operating frequency of the stylus to the target operating frequency of the touch screen, wherein the response signal is obtained according to the target operating frequency of the touch screen via modulation.

2. The method according to claim 1 , wherein prior to the receiving a search signal sent by the stylus, the method further comprises:
detecting noise information of the touch screen, and determining the target operating frequency of the touch screen according to the noise information.

3. The method according to claim 2 , wherein the detecting noise information of the touch screen, and determining the target operating frequency of the touch screen according to the noise information comprises:
detecting noise strengths of the touch screen at each frequency, and
setting a frequency with the noise strength lower than a predetermined strength threshold among the detected noise strengths as the target operating frequency of the touch screen or setting a frequency with a minimum noise strength among the detected noise strengths as the target operating frequency of the touch screen.

4. The method according to claim 3 , wherein:
setting a frequency with the noise strength lower than a predetermined strength threshold among the detected noise strengths as the target operating frequency of the touch screen comprises: selecting a frequency to which the stylus can most quickly hop via a hopping function as the target operating frequency of the touch screen if there is more than one frequency with the noise strengths lower than the predetermined noise threshold, or
the setting a frequency with a minimum noise strength among the detected noise strengths as the target operating frequency of the touch screen comprises: selecting a frequency to which the stylus can most quickly hop via a hopping function as the target operating frequency of the touch screen if there is more than one frequency at which the noise strength is the minimum.

5. The method according to claim 1 , wherein the enabling the stylus to adjust the operating frequency of the stylus to the target operating frequency of the touch screen comprises:
enabling the stylus to determine the frequency of the search signal as the target operating frequency of the stylus if the frequency of the search signal is equal to the target operating frequency of the touch screen.

6. A method for determining a target operating frequency of a stylus, executed by the stylus, the method comprising:
sending a search signal to a touch screen, wherein the search signal has a frequency corresponding to an operating frequency of the stylus;
if the frequency of the search signal and a target operating frequency of the touch screen satisfy a predetermined first relationship, receiving a response signal sent by the touch screen, wherein the response signal is obtained according to the target operating frequency of the touch screen via modulation; and
determining the target operating frequency of the touch screen according to the predetermined first relationship and the frequency of the search signal and adjusting the operating frequency of the stylus to the target operating frequency of the touch screen, if the frequency of the search signal and the target operating frequency of the touch screen satisfy the predetermined first relationship.

7. The method according to claim 6 , comprising:
switching the stylus to another operating frequency and sending a next search signal to the touch screen if the frequency of the search signal and the target operating frequency of the touch screen do not satisfy the predetermined first relationship.

8. The method according to claim 6 , wherein the determining the target operating frequency of the touch screen according to a predetermined first relationship and the frequency of the search signal comprises:
judging whether the frequency of the response signal and the operating frequency of the stylus satisfy a predetermined second relationship;
determining the target operating frequency of the touch screen according to the predetermined first relationship and the frequency of the search signal, if the frequency of the response signal and the current operating frequency of the stylus satisfy the predetermined second relationship; and
switching the stylus to another operating frequency and sending a next search signal to the touch screen if the frequency of the response signal and the current operating frequency of the stylus do not satisfy the predetermined second relationship.

9. The method according to claim 6 , wherein the determining the target operating frequency of the touch screen according to the predetermined first relationship and the frequency of the search signal if the frequency of the search signal and the target operating frequency of the touch screen satisfy the predetermined first relationship comprises:
determining the frequency of the search signal as the target operating frequency of the stylus if the frequency of the search signal is equal to the target operating frequency of the touch screen.

10. The method according to claim 9 , wherein the determining the frequency of the search signal as the target operating frequency of the touch screen if the frequency of the search signal is equal to the target operating frequency of the touch screen comprises:
judging whether the frequency of the response signal is equal to the operating frequency of the stylus; and
determining the frequency of the search signal as the target operating frequency of the touch screen if the frequency of the response signal is equal to the operating frequency of the stylus.

11. A touch screen, comprising a processor and a memory, the memory being configured to store instructions encoded thereon for enabling the processor to perform the operations comprising:
receiving a search signal sent by a stylus, and detecting a frequency of the search signal, wherein the frequency of the search signal corresponds to an operating frequency of the stylus;
judging whether the frequency of the search signal and a target operating frequency of the touch screen satisfy a predetermined first relationship; and
sending a response signal to the stylus, and enabling the stylus to acquire the target operating frequency of the touch screen according to the predetermined first relationship and the frequency of the search signal and to adjust the operating frequency of the stylus to the target operating frequency of the touch screen, wherein the response signal is obtained according to the target operating frequency of the touch screen via modulation if the frequency of the search signal and the target operating frequency of the touch screen satisfy the predetermined first relationship.

12. The touch screen according to claim 11 , wherein the operations further comprise:
detecting a noise

Assignees

• Shenzhen Goodix Tech Co Ltd

Inventors

• Liang Zhibing
• Yang Wangwang

Classifications

• G06F3/03545 Primary

  Pens or stylus · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/044

  by capacitive means · CPC title

• G06F3/0442

  using active external devices, e.g. active pens, for transmitting changes in electrical potential to be received by the digitiser · CPC title