Patent ID: 9483140
Filing Date: 2016-11-01
CPC Classification: G06F

Claim Text:
1. A touch sensor comprising: a touch panel including driving lines and sensing lines, wherein a node capacitor is formed between the neighboring driving and sensing lines; and a sensing unit electrically connected to the sensing lines to sense variation in the capacitance of the node capacitor, wherein the sensing unit comprises: an amplifier including a first input terminal configured to receive a signal from any one of the sensing lines, a second input terminal connected to a first power source, and an output terminal; a feedback capacitor connected between the first input terminal and the output terminal; and a pass transistor connected in parallel to the feedback capacitor between the first input terminal and the output terminal and operated in response to a first control signal and a second control signal, wherein an ON-resistance of the pass transistor is varied according to a magnitude of a signal input to the first input terminal and ON-resistance is a resistance value in an ON state of the pass transistor, and wherein the ON-resistance based on a source voltage of the pass transistor is varied based on variation of an output of the amplifier.