Patent ID: 8902200
Filing Date: 2014-12-02
Classification: G06F

Abstract:
1. A touch panel system comprising: a touch panel including a plurality of sense lines, and a plurality of drive lines provided so as to intersect the sense lines and form capacitances with the sense lines; a drive line driving circuit for driving the drive lines in parallel; a touch panel controller for processing signals of the sense lines and generating touch information; and a region setting section for setting an effective region in the touch panel based on the touch information, wherein the touch panel controller includes: a subtracting section for finding differences in signals between respective pairs of the sense lines adjacent to each other; a decoding section for calculating a distribution of differences between the capacitances by calculating an inner product of each of code sequences for driving the drive lines in parallel and each of difference output sequences, the difference output sequences being calculated by the subtracting section and corresponding to the code sequences; and a touch detecting section for generating the touch information based on the distribution of differences between the capacitances calculated by the decoding section, the region setting section updates the effective region set in the touch panel to set a new effective region based on the touch information, and there is carried out at least one of: a first operation in which the drive line driving circuit selectively drives the drive line passing through the effective region set currently; and a second operation in which the touch panel controller selectively processes the signal of the sense line passing through the effective region set currently.