Patent ID: 9081456
Filing Date: 2015-07-14
Classification: G06F

Abstract:
1. A detection apparatus, for detecting an N number of capacitors in a touch panel to determine a touch position on the touch panel, N being an integer greater than 1, comprising: a voltage generator, for generating an N number of input signals, and providing an ith input signal of the N number of input signals to an ith capacitor of the N number of capacitors, wherein the N number of input signals are different and respectively correspond to one of a delayed sequence of a maximum length sequence and the maximum length sequence, and i is an integral index of N between 1 and N; a summation module, for summing up an N number of response signals, which are generated after providing the N number of input signals to the N number of capacitors, to generate a summed signal; an N number of multipliers, of which an ith multiplier multiplies the summed signal by the ith input signal to generate an ith multiplied signal; an N number of integrators, of which an ith integrator integrates the ith multiplied signal to generate an ith integrated signal, wherein the maximum length sequence has a period, each of the N number of integrators has an integration interval length, and the integration interval length is a P multiple of the period and P is a positive integer; and an estimation module, for estimating capacitance values of the N number of capacitors according to the N number of integrated signals, respectively, wherein the estimation module samples the ith integrated signal at every predetermined interval, and the predetermined interval is the P multiple of the period; wherein the maximum length sequence comprises an M number of bits, wherein M is equal to 2