Touch sensor
First Claim
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, andwherein the ON-resistance based on a source voltage of the pass transistor is varied based on variation of an output of the amplifier.
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Accused Products
Abstract
Disclosed is a touch sensor including a touch panel including driving lines and sensing lines, a node capacitor being 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. The sensing unit includes 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 current controller connected in parallel to the feedback capacitor between the first input terminal and the output terminal to control current flowing to the feedback capacitor.
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Citations
15 Claims
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1. A touch sensor comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification