The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 06, 2019
Filed:
Jan. 25, 2018
Shenzhen Goodix Technology Co., Ltd., Shenzhen, Guangdong, CN;
Shuo Fan, Guangdong, CN;
SHENZHEN GOODIX TECHNOLOGY CO., LTD., Shenzhen, CN;
Abstract
The present disclosure relates to a capacitance variation detection circuit, a touch screen and a touch detection method. The method includes: connecting one terminal of a detection capacitor and one terminal of a denoising capacitor to a first power simultaneously, and connecting the other terminal of the detection capacitor and the other terminal of a denoising capacitor to a reference ground simultaneously; disconnecting the detection capacitor from the first power source and connecting it to the negative input terminal of the operation amplifier, switching the one terminal of the denosing capacitor from being connected to the first power source to being connected to the reference ground, and connecting the other terminal of the denoising capacitor to the negative input terminal of the operational amplifier; and acquiring an output result of the operational amplifier, and judging whether there is a touch operation according to the output result.