Touch device and sensing compensation method
First Claim
Patent Images
1. A touch device, comprising:
- a touch panel;
a sensing compensation circuit, having a sensing terminal coupled to a sense line of the touch panel, and providing a compensation-impedance according to features of the touch panel, wherein the compensation-impedance is a negative input impedance; and
a sensing circuit, having an input terminal coupled to an output terminal of the sensing compensation circuit to sense touch information of a touch unit coupled to the sense line in the touch panel via the sensing compensation circuit, and receiving the touch information compensated by the sensing compensation circuit,wherein the sensing compensation circuit comprises a negative impedance circuit having an input terminal coupled to the touch panel and an output terminal providing touch information of the touch unit of the touch panel, wherein the input terminal of the negative impedance circuit provides the negative input impedance, wherein an absolute value of the negative input impedance falls within an impedance range defined according to an impedance of the sense line of the touch panel, and the negative impedance circuit comprises;
an amplifier, having an inverted input terminal coupled to the input terminal of the negative impedance circuit and an output terminal coupled to the output terminal of the negative impedance circuit;
a first impedance, having a first terminal and a second terminal respectively coupled to the inverted input terminal and the output terminal of the amplifier;
a second impedance, having a first terminal and a second terminal respectively coupled to a non-inverted input terminal and the output terminal of the amplifier; and
a third impedance, having a first terminal and a second terminal respectively coupled to the non-inverted input terminal of the amplifier and a reference voltage.
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Accused Products
Abstract
A touch device and a sensing compensation method are provided. The touch device may include a touch panel, a sensing compensation circuit and a sensing circuit. The sensing compensation circuit may be coupled to the touch panel for providing a compensation-impedance according to features of the touch panel. The sensing circuit may be coupled to the sensing compensation circuit. The sensing circuit receives touch information compensated by the sensing compensation circuit.
24 Citations
25 Claims
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1. A touch device, comprising:
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a touch panel; a sensing compensation circuit, having a sensing terminal coupled to a sense line of the touch panel, and providing a compensation-impedance according to features of the touch panel, wherein the compensation-impedance is a negative input impedance; and a sensing circuit, having an input terminal coupled to an output terminal of the sensing compensation circuit to sense touch information of a touch unit coupled to the sense line in the touch panel via the sensing compensation circuit, and receiving the touch information compensated by the sensing compensation circuit, wherein the sensing compensation circuit comprises a negative impedance circuit having an input terminal coupled to the touch panel and an output terminal providing touch information of the touch unit of the touch panel, wherein the input terminal of the negative impedance circuit provides the negative input impedance, wherein an absolute value of the negative input impedance falls within an impedance range defined according to an impedance of the sense line of the touch panel, and the negative impedance circuit comprises; an amplifier, having an inverted input terminal coupled to the input terminal of the negative impedance circuit and an output terminal coupled to the output terminal of the negative impedance circuit; a first impedance, having a first terminal and a second terminal respectively coupled to the inverted input terminal and the output terminal of the amplifier; a second impedance, having a first terminal and a second terminal respectively coupled to a non-inverted input terminal and the output terminal of the amplifier; and a third impedance, having a first terminal and a second terminal respectively coupled to the non-inverted input terminal of the amplifier and a reference voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A sensing compensation method for a touch device, comprising:
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providing a touch panel; providing a compensation-impedance by a sensing compensation circuit according to features of the touch panel, wherein the compensation-impedance is a negative input impedance, to compensate an impedance of a sense line of the touch panel; and sensing, by a sensing circuit, touch information of a touch unit coupled to the sense line in the touch panel via the sensing compensation circuit, wherein the touch information is compensated by the sensing compensation circuit, wherein the sensing compensation circuit comprises a negative impedance circuit having an input terminal coupled to the touch panel and an output terminal providing touch information of the touch unit of the touch panel, wherein the input terminal of the negative impedance circuit provides the negative input impedance, an absolute value of the negative input impedance falls within an impedance range defined according to an impedance of the sense line, and the negative impedance circuit comprises; an amplifier, having an inverted input terminal coupled to the input terminal of the negative impedance circuit and an output terminal coupled to the output terminal of the negative impedance circuit; a first impedance, having a first terminal and a second terminal respectively coupled to the inverted input terminal and the output terminal of the amplifier; a second impedance, having a first terminal and a second terminal respectively coupled to a non-inverted input terminal and the output terminal of the amplifier; and a third impedance, having a first terminal and a second terminal respectively coupled to the non-inverted input terminal of the amplifier and a reference voltage, and wherein a sensing terminal of the sensing compensation circuit is coupled to the sense line of the touch panel, and a output terminal of the sensing compensation circuit is coupled to an input terminal of the sensing circuit. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A touch device, comprising:
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a touch panel; a sensing compensation circuit, having a sensing terminal coupled to a sense line of the touch panel, and providing a compensation-impedance according to features of the touch panel, wherein the compensation-impedance is a negative input impedance; and a sensing circuit, having an input terminal coupled to an output terminal of the sensing compensation circuit to sense touch information of a touch unit coupled to the sense line in the touch panel via the sensing compensation circuit, and receiving the touch information compensated by the sensing compensation circuit, wherein the sensing compensation circuit comprises a negative impedance circuit, having an input terminal coupled to the touch panel and an output terminal providing touch information of the touch unit of the touch panel, wherein the input terminal of the negative impedance circuit provides the negative input impedance, an absolute value of the negative input impedance falls within an impedance range defined according to an impedance of a sense line of the touch panel, and the negative impedance circuit is a first negative impedance circuit, a second negative impedance circuit or a third negative impedance circuit, wherein the first negative impedance circuit comprises; an amplifier, having an inverted input terminal coupled to the input terminal of the negative impedance circuit, and an output ten iinal coupled to the output terminal of the negative impedance circuit ; a first transistor, having a first terminal and a second terminal respectively coupled to the inverted input terminal and the output terminal of the amplifier; a second transistor, having a first terminal and a second terminal respectively coupled to a non-inverted input terminal and the output terminal of the amplifier; and a third transistor, having a first terminal and a second terminal respectively coupled to the non-inverted input terminal of the amplifier and a reference voltage; the second negative impedance circuit comprises; an amplifier, having an inverted input terminal coupled to the input terminal of the negative impedance circuit and an output terminal coupled to the output terminal of the negative impedance circuit; a first variable inductor, having a first terminal and a second terminal respectively coupled to the inverted input terminal and the output terminal of the amplifier; a second variable inductor, having a first terminal and a second terminal respectively coupled to a non-inverted input terminal and the output terminal of the amplifier; and a third variable inductor, having a first terminal and a second terminal respectively coupled to the non-inverted input terminal of the amplifier and a reference voltage; and the third negative impedance circuit comprises; an amplifier, having an inverted input terminal coupled to the input terminal of the negative impedance circuit and an output terminal coupled to the output terminal of the negative impedance circuit; a first variable capacitor, having a first terminal and a second terminal respectively coupled to the inverted input terminal and the output terminal of the amplifier; a second variable capacitor, having a first terminal and a second terminal respectively coupled to a non-inverted input terminal and the output terminal of the amplifier; and a third variable capacitor, having a first terminal and a second terminal respectively coupled to the non-inverted input terminal of the amplifier and a reference voltage. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
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Specification