Patent ID: 9024903
Filing Date: 2015-05-05
Classification: G06F

Abstract:
1. A capacitive touch device, comprising: a capacitive touch panel, comprising a sensing point matrix formed by m driving lines and n sensing lines, m and n being positive integers; a driving control unit, coupled to the m driving lines, for sequentially providing m driving signals to the m driving lines in m corresponding driving periods, respectively; a conversion unit, coupled to the n sensing lines, for obtaining n sensing values through conversion with reference to voltages at a plurality of sensing points corresponding to the n sensing lines in the m corresponding driving periods, respectively; and a processing unit, coupled to the conversion unit, for receiving the m×n sensing values in each of the m driving periods, and dividing the m×n sensing values into a plurality of sensing value sets with reference to conversion time sequences of the m×n number of sensing values; the sensing values in each of the sensing value sets being substantially obtained at a substantially same time point through the conversion unit; wherein, the processing unit calculates a difference between each of the sensing values in each of the sensing value sets and a baseline value, performs a statistical computation according to the differences corresponding to the sensing value sets to generate a plurality of noise correction values, and further corrects the sensing values of each of the sensing value sets according to the noise correction values to obtain m×n corrected sensing values.