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:
Jun. 30, 2015
Filed:
Jun. 20, 2012
Do-hwan OH, Seoul, KR;
Do-Hwan Oh, Seoul, KR;
MELFAS INC., Seoul, KR;
Abstract
A mixer of a touch panel system includes a first switch configured to switch a sensing signal in accordance with a reference signal; a second switch configured to switch the sensing signal in accordance with a phase-inverted reference signal from the reference signal. Further, the mixer of the touch panel system includes a first low pass filter configured to perform low-pass filtering on a first output signal produced from the first switch; and a second low pass filter configured to perform low-pass filtering on a second output signal produced from the second switch. Furthermore, the mixer of the touch panel system includes a differentiator configured to differentiate signals produced from the first low pass filter and the second low pass filter, to thereby produce a signal of constant level as the sensing signal.