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:
Dec. 03, 2002
Filed:
Apr. 28, 1999
Do-youn Kim, Suwon, KR;
Abstract
A position coordinates signal detecting circuit of a sensor panel is provided. The position coordinates signal detecting circuit of the sensor panel according to the present invention includes first through fourth resistors each of which has one end connected to one of the left upper-most edge, the left lower-most edge, the right upper-most edge, and the right lower-most edge of the sensor panel. First through fourth driving signal generators are respectively connected to the other side of the first through fourth resistors for generating a driving signal so as to drive the sensor panel. Analog switches receive first through fourth pairs of voltages respectively generated at both ends of the first through fourth resistors. The first through fourth pairs of voltage are multiplexed in response to first through fourth selecting signals to provide a multiplexed signal, and a differential amplifier for amplifies the multiplexed signal. The position coordinates detecting circuit of the sensor panel according to the present invention makes it possible to amplify the voltage difference between both end of the variable resistors. Thus, the characteristics mismatching between different amplifiers is reduced, and the position coordinates are detected accurately.