Patent ID: 8665224

Claim:
A capacitance touch sensor comprising: a square wave generator for generating a square wave clock; N buffers, respectively controlled by N control signals, wherein only one of the N control signals is enabled at the same time, and N is an integer greater than 1; a plurality of sensor panels, which constitutes architecture of a matrix having N columns and M rows, wherein each of sensor panels comprises a first metal and a second metal, wherein the first metal is coupled to the square wave generator for receiving the square wave clock and the second metal is coupled to a common voltage, wherein input terminals of each of the columns of the sensor panels are respectively connected to an output terminal of one of the N buffers, and M is an integer greater than 1, wherein the sensor panels exclude any active component; M peak detectors for respectively receiving output signals of the M rows of sensor panels and generating analog peak signals, wherein the i th peak detector corresponds to sensor panels at the i th row, and the i th peak detector comprises: N diodes, each of the N diodes having a P pole and a N pole, wherein the P pole of the j th diode of the i th peak detector is directly connected to the first metal of the corresponding sensor panel at the i th row and the j th column, and the N poles are connected together, wherein i and j are natural numbers, i is smaller than or equal to M, and j is smaller than or equal to N; a resistor having a first terminal, which is directly connected to the N poles of the N diodes and generates the analog peak signal, and a second terminal grounded; and a capacitor connected to the resistor in parallel; M analog-to-digital converters for respectively receiving the analog peak signals of the M peak detectors and generating digital peak signals; and a control unit for sequentially receiving the digital peak signals of the M analog-to-digital converters and respectively generating a plurality of detection signals according to the digital peak signals to judge whether the plurality of sensor panels is touched or not, wherein the control unit further generates the N control signals; and wherein there is no amplifier between the sensor panels and the peak detectors.