Key reference updating method and module, and terminal device

Patent metadata

Field	Value
Publication number	US-11054947-B2
Application number	US-201816159172-A
Country	US
Kind code	B2
Filing date	Oct 12, 2018
Priority date	Nov 24, 2016
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

In keystroke recognition technologies, a method and a module for updating a keystroke reference, and a terminal device are provided. The method for updating a keystroke reference includes: receiving a pressing interrupt sent by a keystroke chip; obtaining a plurality of pressing capacitance values from the keystroke chip, where the plurality of pressing capacitance values include a capacitance value of the keystroke chip at a generation moment of the pressing interrupt and a capacitance value of the keystroke chip at a scanning moment next to the generation moment of the pressing interrupt; and setting a release reference of the keystroke chip according to the plurality of pressing capacitance values, to improve interchangeability and anti-interference of the keystroke chip with no extra burden on a main control chip.

First claim

What is claimed is:

1. A method for updating a keystroke reference, comprising:
receiving a pressing interrupt sent by a keystroke chip;
obtaining a plurality of pressing capacitance values from the keystroke chip, wherein the plurality of pressing capacitance values include a capacitance value of the keystroke chip at a generation moment of the pressing interrupt and a capacitance value of the keystroke chip at a scanning moment next to the generation moment of the pressing interrupt; and
setting a release reference of the keystroke chip according to the plurality of pressing capacitance values;
the method further comprising:
receiving a pressing reference error interrupt sent by the keystroke chip;
obtaining a normal capacitance value from the keystroke chip, wherein the normal capacitance value is a capacitance value of the keystroke chip when not pressed; and
setting the pressing reference according to the normal capacitance value.

2. The method according to claim 1 , further comprising:
receiving a release interrupt sent by the keystroke chip;
obtaining a plurality of release capacitance values from the keystroke chip, wherein the plurality of release capacitance values comprise a capacitance value of the keystroke chip at a generation moment of the release interrupt and a capacitance value of the keystroke chip at a scanning moment next to the generation moment of the release interrupt; and
setting a pressing reference of the keystroke chip according to the plurality of release capacitance values.

3. The method according to claim 2 , wherein:
the setting a release reference of the keystroke chip according to the plurality of pressing capacitance values comprises: setting a pressing capacitance value that meets a first preset condition from the plurality of pressing capacitance values as the release reference of the keystroke chip; and
the setting a pressing reference of the keystroke chip according to the plurality of release capacitance values comprises: setting a release capacitance value that meets a second preset condition from the plurality of release capacitance value as the pressing reference of the keystroke chip.

4. The method according to claim 3 , wherein:
the first preset condition is a smallest pressing capacitance value of the plurality of pressing capacitance values, and the second preset condition is a largest release capacitance value of the plurality of release capacitance values.

5. The method according to claim 3 , wherein:
the first preset condition is a largest pressing capacitance value of the plurality of pressing capacitance values, and the second preset condition is a smallest release capacitance value of the plurality of release capacitance values.

6. The method according to claim 2 , wherein the release interrupt is generated by the keystroke chip according to the release reference and a release threshold, and the pressing interrupt is generated by the keystroke chip according to the pressing reference and a pressing threshold.

7. A module for updating a keystroke reference, comprising: a main control chip and a keystroke apparatus comprising a keystroke chip, wherein
the keystroke chip is configured to generate a pressing interrupt and send the pressing interrupt to the main control chip when a finger presses the keystroke apparatus;
the main control chip is configured to receive the pressing interrupt, and obtain a plurality of pressing capacitance values from the keystroke chip, wherein the plurality of pressing capacitance values comprise a capacitance value of the keystroke chip at a generation moment of the pressing interrupt and a capacitance value of the keystroke chip at a scanning moment next to the generation moment of the pressing interrupt; and
the main control chip is further configured to set a release reference of the keystroke chip according to the plurality of pressing capacitance values;
wherein the keystroke chip is further configured to generate a pressing reference error interrupt and send the pressing reference error interrupt to the main control chip;
the main control chip is configured to receive the pressing reference error interrupt, and obtain a normal capacitance value from the keystroke chip, wherein the normal capacitance value is a capacitance value of the keystroke chip in a state of being not pressed; and
the main control chip is further configured to set the pressing reference according to the normal capacitance value.

8. The module according to claim 7 , wherein:
the keystroke chip is further configured to generate a release interrupt and send the release interrupt to the main control chip when the finger releases from the keystroke apparatus;
the main control chip is further configured to receive the release interrupt, and obtain a plurality of release capacitance values from the keystroke chip, wherein the plurality of release capacitance values comprise a capacitance value of the keystroke chip at a generation moment of the release interrupt and a capacitance value of the keystroke chip at a scanning moment next to the generation moment of the release interrupt; and
the main control chip is further configured to set a pressing reference of the keystroke chip according to the plurality of release capacitance values.

9. The module according to claim 8 , wherein the main control chip is configured to set a pressing capacitance value that meets a first preset condition from the plurality of pressing capacitance values as the release reference of the keystroke chip, and set a release capacitance value that meets a second preset condition from the plurality of release capacitance value as the pressing reference of the keystroke chip.

10. The module according to claim 9 , wherein:
the first preset condition is a smallest pressing capacitance value of the plurality of pressing capacitance values, and the second preset condition is a largest release capacitance value of the plurality of release capacitance values.

11. The module according to claim 9 , wherein:
the first preset condition is a largest pressing capacitance value of the plurality of pressing capacitance values, and the second preset condition is a smallest release capacitance value of the plurality of release capacitance values.

12. The module according to claim 8 , wherein the release interrupt is generated by the keystroke chip according to the release reference and a release threshold, and the pressing interrupt is generated by the keystroke chip according to the pressing reference and a pressing threshold.

13. The module according to claim 7 , wherein the main control chip enters into an operation state from a sleep state after the main control chip receives the pressing interrupt and before the main control chip receives the plurality of pressing capacitance values from the keystroke chip.

14. The module according to claim 7 , wherein the keystroke apparatus is a fingerprint recognition apparatus, and the keystroke chip is a fingerprint chip.

15. A terminal device, comprising: a module for updating a keystroke reference; the module comprising: a main control chip and a keystroke apparatus comprising a keystroke chip, wherein;
the keystroke chip is configured to generate a pressing interrupt and send the pressing interrupt to the main control chip when a finger presses the keystroke apparatus;
the main control chip is configured to receive the pressing interrupt, and obtain a plurality of pressing capacitance values from the keystroke chip, wherein the plurality of pressing capacitance values comprise a capacitance value of the keystroke chip at a generation

Assignees

• Shenzhen Goodix Techology Co Ltd
• Shenzhen Goodix Tech Co Ltd

Inventors

• Lin Jinhui
• Wu Dan
• Long Yunfang

Classifications

• G06V40/1306 Primary

  non-optical, e.g. ultrasonic or capacitive sensing · CPC title

• H03K2217/94026

  Automatic threshold calibration; e.g. threshold automatically adapts to ambient conditions or follows variation of input · CPC title

• H03K17/962

  Capacitive touch switches · CPC title

• G06F3/023

  Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes · CPC title

• G06F21/32

  using biometric data, e.g. fingerprints, iris scans or voiceprints · CPC title