Title:
PRESSURE DETECTION CHIP AND PRESSURE DETECTION METHOD
Document Type and Number:
WIPO Patent Application WO/2019/173934
Kind Code:
A1
Abstract:
A pressure detection chip and a pressure detection method, the method being performed by a pressure detection device (300) comprising a cancellation circuit (120) and a coupling circuit (200), wherein the cancellation circuit (120) and the coupling circuit (200) are connected in parallel, the coupling circuit (200) comprises a variable capacitance component having a first electrode layer and a second electrode layer, and the distance between the first electrode layer and the second electrode layer changes when the first electrode layer is subject to touch pressure. The pressure detection method comprises: inputting a first input signal to the cancellation circuit and outputting a first output signal (S410); inputting a second input signal to the coupling circuit and outputting a second output signal, the first input signal and the second input signal having a 180 degree phase difference, the first output signal being used to cancel the second output signal (S420); and determining, according to the first output signal and the second output signal, whether the first electrode layer is subject to the touch pressure (S430). The described pressure detection chip and the pressure detection method may improve the sensitivity of pressure detection.
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Inventors:
WEI HAIJUN (CN)
CHEN TUJIANG (CN)
CHEN TUJIANG (CN)
Application Number:
PCT/CN2018/078677
Publication Date:
September 19, 2019
Filing Date:
March 12, 2018
Export Citation:
Assignee:
SHENZHEN GOODIX TECH CO LTD (CN)
International Classes:
G06F3/044
Domestic Patent References:
| WO2015046289A1 | 2015-04-02 |
Foreign References:
| CN106054433A | 2016-10-26 | |||
| CN103914197A | 2014-07-09 | |||
| CN106445220A | 2017-02-22 | |||
| CN107229366A | 2017-10-03 | |||
| CN105930019A | 2016-09-07 | |||
| CN106855760A | 2017-06-16 |
Other References:
See also references of EP 3567461A4
Attorney, Agent or Firm:
LONGSUN LEAD IP LTD. (CN)
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