# US 11,899,879 B2 · Stylus detection method, system, and related apparatus for switching frequencies for detecting input signals

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- Number: US 11,899,879 B2
- Document ID: US11899879B2
- Status: Granted
- Kind: B2
- Application number: 17/281,187
- Filed: 2018-09-30
- Published: 2021-12-23
- Granted: 2024-02-13
- Earliest claimed: 2018-09-30
- Assignees: Huawei Technologies Co., Ltd.
- Applicants: Huawei Technologies Co., Ltd.
- Inventors: Honglei Luo; Junyong Zhang; Weihuan Li; Yejian Xu
- Web page: https://patentgrep.com/patent/US11899879B2

## CPC

- G06F 3/041662: {using alternate mutual and self-capacitive scanning}
- G06F 1/3262: {Power saving in digitizer or tablet}
- G06F 3/03545: {Pens or stylus}
- G06F 3/0383: {Signal control means within the pointing device}
- 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)}
- G06F 3/0442: {using active external devices, e.g. active pens, for transmitting changes in electrical potential to be received by the digitiser}
- G06F 3/0487: using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
- G06F 3/0488: using a touch-screen or digitiser, e.g. input of commands through traced gestures
- G06F 3/04883: for inputting data by handwriting, e.g. gesture or text
- G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes}
- G06F 2203/04106: 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
- G06F 2203/04803: Split screen, i.e. subdividing the display area or the window area into separate subareas
- Y02D 30/70: in wireless communication networks
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A stylus detection method includes detecting, by a terminal, an input signal of a stylus at a first frequency, receiving a first input of the stylus through a touchscreen, detecting, in response to the first input, the input signal of the stylus at a second frequency, detecting the input signal of the stylus at a third frequency when detecting the input signal of the stylus at the second frequency and when a duration in which the terminal does not detect the input signal of the stylus is greater than a first time period. The second frequency is greater than the third frequency and the third frequency is greater than the first frequency.

## Claims

### Claim 1

A stylus detection method implemented by a terminal, wherein the method comprises:
detecting for an input signal of a stylus at a first frequency;
receiving a first input of the stylus through a touchscreen of the terminal;
switching, in response to the first input, to detecting for the input signal at a second frequency;
switching to detecting for the input signal at a third frequency when a first duration during which the terminal does not detect the input signal while detecting for the input signal at the second frequency is greater than a first time period, wherein the second frequency is greater than the third frequency, and wherein the third frequency is greater than the first frequency;
receiving a second input of a user while detecting for the input signal at the second frequency;
turning off, in response to the second input, the touchscreen; and
switching, in response to the second input, to detecting for the input signal at the first frequency.

### Claim 2 (depends on 1)

The method of claim 1, further comprising switching to detecting for the input signal at the first frequency when a second duration during which the terminal does not detect the input signal of the stylus while detecting for the input signal at the third frequency is greater than a second time period.

### Claim 3 (depends on 1)

The method of claim 1, further comprising:
receiving a third input of the stylus while detecting for the input signal at the third frequency; and
switching, in response to the third input, to detecting for the input signal at the second frequency.

### Claim 4 (depends on 1)

The method of claim 1, wherein after turning off the touchscreen, the method further comprises stopping detection of a touch input of the user.

### Claim 5 (depends on 1)

The method of claim 1, further comprising:
receiving a third input of the stylus after turning off the touchscreen and while detecting for the input signal at the first frequency;
switching, in response to the third input, to detecting for the input signal at the second frequency; and
saving, in response to the third input, written content of the third input, wherein the written content comprises handwriting of the stylus or text information recognized by the terminal from the handwriting.

### Claim 6 (depends on 1)

The method of claim 1, further comprising:
receiving a third input of a user while detecting for the input signal at the third frequency;
turning off, in response to the third input, the touchscreen; and
switching, in response to the third input, to detecting for the input signal at the first frequency.

### Claim 7 (depends on 1)

The method of claim 1, wherein while detecting for the input signal at the second frequency, the method further comprises detecting, in a first detection state through the touchscreen, for a touch input of a user in a mutual capacitance detection manner at a fourth frequency and a self-capacitance detection manner at a fifth frequency.

### Claim 8 (depends on 1)

The method of claim 1, wherein while detecting for the input signal at the third frequency, the method further comprises detecting, in a second detection state through the touchscreen, for a touch input of a user in a mutual capacitance detection manner at a fourth frequency and a self-capacitance detection manner at a fifth frequency.

### Claim 9 (depends on 1)

The method of claim 1, further comprising:
receiving a third input of a user; and
in response to the third input either:
stopping detection of the input signal; or
switching to detecting for the input signal at the first frequency.

### Claim 10 (depends on 1)

The method of claim 1, further comprising:
stopping detecting for the input signal;
receiving a third input of a user after stopping detecting for the input signal;
obtaining, in response to the third input, timing information of receiving the input signal and the third input;
detecting, based on the timing information, for the input signal at the second frequency when the terminal has received the input signal before receiving the third input; and
detecting for the input signal at the first frequency when the terminal has not received the input signal before receiving the third input.

### Claim 11 (depends on 1)

The method of claim 1, further comprising:
receiving a third input of a user;
restoring, in response to the third input, factory settings; and
switching, in response to the third input, to detecting for the input signal at the first frequency.

### Claim 12 (depends on 1)

The method of claim 1, further comprising:
receiving, a third input of a user; and
restarting, in response to the third input, the terminal, wherein a fourth frequency of detecting for the input signal before a restart is same as a fifth frequency of detecting for the input signal after the restart.

### Claim 13

An electronic device comprising:
a touchscreen; and
a processor coupled to the touchscreen and configured to:
detect for an input signal of a stylus at a first frequency;
receive a first input of the stylus through the touchscreen;
switch, in response to the first input, to detecting for the input signal at a second frequency;
switch to detecting for the input signal at a third frequency when a first duration during which the electronic device does not detect the input signal while detecting for the input signal at the second frequency is greater than a first time period, wherein the second frequency is greater than the third frequency, and wherein the third frequency is greater than the first frequency;
receive a second input of a user while detecting for the input signal at the second frequency;
turn off, in response to the second input, the touchscreen; and
switch, in response to the second input, to detecting for the input signal at the first frequency.

### Claim 14 (depends on 13)

The electronic device of claim 13, wherein the processor is further configured to switch to detecting for the input signal at the first frequency when a second duration during which the electronic device does not detect the input signal while detecting for the input signal at the third frequency is greater than a second time period.

### Claim 15 (depends on 13)

The electronic device of claim 13, wherein the processor is further configured to:
receive a third input of the stylus while detecting for the input signal at the third frequency; and
switch, in response to the third input, to detecting for the input signal at the second frequency.

### Claim 16 (depends on 13)

The electronic device of claim 13, wherein the processor is further configured to:
receive a third input of a user while detecting for the input signal at the third frequency;
turn off, in response to the third input, the touchscreen; and
switch, in response to the third input, to detecting for the input signal at the first frequency.

### Claim 17 (depends on 13)

The electronic device of claim 13, wherein while detecting for the input signal at the second frequency, the processor is further configured to detect, in a first detection state through the touchscreen, for a touch input of a user in a mutual capacitance detection manner at a fourth frequency and a self-capacitance detection manner at a fifth frequency.

### Claim 18

A computer program product comprising computer-executable instructions stored on a non-transitory computer readable storage medium that, when executed by a processor of an electronic device, cause the electronic device to:
detect for an input signal of a stylus at a first frequency;
receive a first input of the stylus through a touchscreen of the electronic device;
switch, in response to the first input, to detecting for the input signal at a second frequency;
switch to detecting for the input signal at a third frequency when a duration during which the electronic device does not detect the input signal while detecting for the input signal at the second frequency is greater than a first time period, wherein the second frequency is greater than the third frequency, and wherein the third frequency is greater than the first frequency;
receive a second input of a user while detecting for the input signal at the second frequency;
turn off, in response to the second input, the touchscreen; and
switch, in response to the second input, to detecting for the input signal at the first frequency.

### Claim 19 (depends on 13)

The electronic device of claim 13, wherein the processor is further configured to:
receive a third input of the stylus after turning off the touchscreen and while detecting for the input signal at the first frequency;
switch, in response to the third input, to detecting for the input signal at the second frequency; and
save, in response to the third input, written content of the third input, wherein the written content comprises handwriting of the stylus or text information recognized by a terminal from the handwriting.

### Claim 20 (depends on 13)

The electronic device of claim 13, wherein the processor is further configured to:
stop detecting for the input signal;
receive a third input of a user after stopping detecting for the input signal;
obtain, in response to the third input, timing information of receiving the input signal and the third input;
detect, based on the timing information, for the input signal at the second frequency when a terminal has received the input signal before receiving the third input; and
detect for the input signal at the first frequency when the terminal has not received the input signal before receiving the third input.