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:
Sep. 04, 2012
Filed:
Apr. 07, 2010
Ke-horng Chen, Taipei County, TW;
Chi-lin Chen, Taipei County, TW;
Yi-chun Chen, Taoyuan County, TW;
Chih-chung Chen, Taichung County, TW;
Chia-lin Liu, Taichung County, TW;
Huai-an LI, Taoyuan County, TW;
Chi-neng MO, Taoyuan County, TW;
Ke-Horng Chen, Taipei County, TW;
Chi-Lin Chen, Taipei County, TW;
Yi-Chun Chen, Taoyuan County, TW;
Chih-Chung Chen, Taichung County, TW;
Chia-Lin Liu, Taichung County, TW;
Huai-An Li, Taoyuan County, TW;
Chi-Neng Mo, Taoyuan County, TW;
Chunghwa Picture Tubes, Ltd., Bade, Taoyuan, TW;
Abstract
In a capacitance sensing analog circuit of a touch panel sensing circuit, by raising a magnitude of a current flowing through a sensing capacitor to form an amplified sensing capacitance, while sensing the amplified sensing capacitance with the aid of pulse width modulation signals, higher resolution of the original sensing capacitance may thus be achieved. Besides, by using a self-calibrating capacitance sensing circuit on the touch panel sensing circuit, linear errors and DC errors of an output signal of the capacitance sensing analog circuit may be filtered off, and thereby resolution of a capacitance amplifying ratio may be effectively raised so as to relieve errors within the capacitance amplifying ratio caused by noises.