Touch Terminal, Active Stylus Detection Method, and System

Patent metadata

Field	Value
Publication number	US-2016239123-A1
Application number	US-201415029254-A
Country	US
Kind code	A1
Filing date	Jul 9, 2014
Priority date	Oct 14, 2013
Publication date	Aug 18, 2016
Grant date	—

Abstract

A touch terminal, an active stylus detection method, and a system are disclosed. The method includes the following steps: separately scanning, by a touch screen controller, multiple pieces of noise information on multiple operating frequencies of an active stylus of a touch screen; determining, by the touch screen controller, a target operating frequency according to the multiple pieces of noise information; and sending, by the touch screen controller, the target operating frequency to the active stylus, and adjusting an operating frequency of the active stylus to the target operating frequency, so that the active stylus and the touch screen operate jointly at the target operating frequency. In the method, the touch screen controller scans noise information on multiple operating frequencies of the active stylus, so as to determine a target operating frequency of the active stylus, so that the active stylus operates at the target operating frequency.

First claim

What is claimed is:

1 . A detection method, comprising the following steps:
separately scanning, by a touch screen controller, multiple pieces of noise information on multiple operating frequencies of an active stylus of a touch screen; determining, by the touch screen controller, a target operating frequency according to the multiple pieces of noise information; and sending, by the touch screen controller, the target operating frequency to the active stylus, and adjusting an operating frequency of the active stylus to the target operating frequency, so that the active stylus and the touch screen operate jointly at the target operating frequency.

2 . The detection method according to claim 1 , further comprising:
receiving, by the touch screen controller, a driving signal and a communication coded signal that are sent by the active stylus after the active stylus is frequency-adjusted to the target operating frequency; and performing, by the touch screen controller, frame synchronization with the active stylus according to the driving signal and the communication coded signal, and acquiring touch information of the active stylus.

3 . The detection method according to claim 1 , wherein an operating mode of the touch screen comprises a finger mode, a stylus mode, and a hybrid mode, and the touch screen controller controls, according to a detected finger touch signal or stylus touch signal, the operating mode of the touch screen to switch between the finger mode, the stylus mode, and the hybrid mode.

4 . The detection method according to claim 3 , wherein after the touch screen enters the finger mode, the method further comprises:
performing, by the touch screen controller, finger scanning in subsequent time slices.

5 . The detection method according to claim 3 , wherein after the touch screen enters the stylus mode, the method further comprises:
detecting, by the touch screen controller, an excitation signal and a coded signal of the active stylus in subsequent time slices.

6 . The detection method according to claim 3 , wherein after the touch screen enters the hybrid mode, the method further comprises:
performing, by the touch screen controller, finger scanning in an Nth time slice, and in an (N+1)th time slice, sending the target operating frequency and detecting a state of the active stylus to generate the stylus touch signal.

7 . The detection method according to claim 1 , wherein the sending, by the touch screen controller, the target operating frequency to the active stylus specifically comprises:
coding, by the touch screen controller, the target operating frequency and generating a corresponding pulse signal; and sending, by the touch screen controller, the corresponding pulse signal to the active stylus through the touch screen.

8 . The detection method according to claim 7 , wherein the sending, by the touch screen controller, the corresponding pulse signal to the active stylus through the touch screen specifically comprises:
sending, by the touch screen controller, the corresponding pulse signal to the active stylus through the touch screen at an operating frequency other than the target operating frequency.

9 . The detection method according to claim 7 , wherein the coding, by the touch screen controller, the target operating frequency and generating the corresponding pulse signal specifically comprises:
controlling, by the touch screen controller, a first area of the touch screen to send the pulse signal, and controlling a second area of the touch screen to send a reverse-phase pulse signal that has the same frequency as but an opposite phase to the pulse signal.

10 . The detection method according to claim 9 , wherein the first area is an upper half screen of the touch screen, and the second area is a lower half screen of the touch screen.

11 . The detection method according to claim 9 , wherein the second area is an area, of the touch screen, in contact with a palm of a user, and the first area is an area not in contact with the palm of the user.

12 . The detection method according to claim 1 , wherein the active stylus acquires the target operating frequency according to the number of pulses.

13 . The detection method according to claim 1 , wherein the active stylus acquires the target operating frequency by means of quadrature demodulation.

14 . A detection system, comprising:
a touch terminal, configured to separately scan multiple pieces of noise information on multiple operating frequencies of an active stylus of a touch screen, and determine a target operating frequency according to the multiple pieces of noise information; and the active stylus, configured to receive the target operating frequency sent by the touch terminal, and adjust an operating frequency of the active stylus to the target operating frequency, so that the active stylus and the touch terminal operate jointly at the target operating frequency.

15 . The detection system according to claim 14 , wherein the touch terminal is further configured to receive a driving signal and a communication coded signal that are sent by the active stylus after the active stylus is adjusted to the target operating frequency, and perform frame synchronization with the active stylus according to the driving signal and the communication coded signal, so as to acquire touch information of the active stylus.

16 . The detection system according to claim 14 , wherein an operating mode of the touch terminal comprises a finger mode, a stylus mode, and a hybrid mode, the touch terminal comprises a touch screen controller, and the touch screen controller controls, according to a detected finger touch signal or stylus touch signal, the operating mode of the touch screen to switch between the finger mode, the stylus mode, and the hybrid mode.

17 . The detection system according to claim 16 , wherein after the touch terminal enters the finger mode, the touch terminal performs finger scanning in subsequent time slices.

18 . The detection system according to claim 16 , wherein after the touch terminal enters the stylus mode, the touch terminal detects an excitation signal and a coded signal of the active stylus in subsequent time slices.

19 . The detection system according to claim 16 , wherein after the touch terminal enters the hybrid mode, the touch terminal performs finger scanning in an Nth time slice, and in an (N+1)th time slice, sends the target operating frequency and detects a state of the active stylus to generate the stylus touch signal.

20 . The detection system according to claim 14 , wherein the touch screen controller codes the target operating frequency and generates a corresponding pulse signal, and sends the corresponding pulse signal to the active stylus.

21 . The detection system according to claim 20 , wherein the touch screen controller sends the corresponding pulse signal to the active stylus at an operating frequency other than the target operating frequency.

22 . The detection system according to claim 20 , wherein the touch screen controller is further configured to control a first area of the touch screen to send the pulse signal, and control a second area of the touch screen to send a reverse-phase pulse signal that has the same frequency as but an opposite phase to the pulse signal.

23 . The detection system according to claim 21 , wherein the first area is an upper half screen of the touch screen, and the second area is

Assignees

• Shenzhen Huiding Technology Co

Inventors

• Ye Jinchun
• Pang Shu
• Liu Qin
• Yang Mengta

Classifications

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/044 Primary

  by capacitive means · CPC title

• G06F3/03545 Primary

  Pens or stylus · 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

• G06F3/0446 Primary

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title