Title:
CAPACITANCE DETECTION CIRCUIT, TOUCH-CONTROL CHIP AND ELECTRONIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/048023
Kind Code:
A1
Abstract:
A capacitance detection circuit, a touch-control chip and an electronic device. The capacitance detection circuit comprises: a control module (112), a charge transfer module (142), a processing module (152), a drive module (122) and a cancellation module (132), wherein the control module (112) is used for controlling the drive module (122) to charge a capacitor (Cx) to be detected, controlling the cancellation module (132) to charge a cancellation capacitor (Cc) and controlling the cancellation capacitor (Cc) to perform charge cancellation processing on the capacitor (Cx) to be detected; the charge transfer module (142) is used for transforming charges of the capacitor (Cx) to be detected that has been subjected to cancellation processing so as to generate an output voltage (VOUT); and the processing module (152) is used for determining, according to the output voltage (VOUT), the capacitance variation of the capacitor (Cx) to be detected before and after the influence of an external electric field. The capacitance detection circuit improves the sensitivity of self-capacitance detection, and finally improves the accuracy of self-capacitance detection.
Inventors:
JIANG HONG (CN)
TANG ZHI (CN)
TANG ZHI (CN)
Application Number:
PCT/CN2018/117925
Publication Date:
March 12, 2020
Filing Date:
November 28, 2018
Export Citation:
Assignee:
SHENZHEN GOODIX TECH CO LTD (CN)
International Classes:
G06F3/044
Foreign References:
| CN108475155A | 2018-08-31 | |||
| CN104049822A | 2014-09-17 | |||
| CN106648268A | 2017-05-10 | |||
| CN102200869A | 2011-09-28 | |||
| JP2018101281A | 2018-06-28 | |||
| CN2018104618W | 2018-09-07 |
Other References:
See also references of EP 3640780A4
Attorney, Agent or Firm:
BEIJING HEADSTAY INTELLECTUAL PROPERTY AGENCY (CN)
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