Multi-touch sensing circuit
First Claim
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1. A multi-touch sensing circuit comprising:
- a voltage-current converter that converts an input voltage into a current;
a touch sensing block that is driven by the current and senses touch of an object by using a capacitor internally formed, wherein the capacitance of the capacitor varies according to the touch of an object; and
an amplifier,wherein a first input terminal of the amplifier is connected to an output terminal of the voltage-current converter and to a first terminal of the touch sensing block, a second input terminal of the amplifier is grounded, and an output terminal of the amplifier is connected to a second terminal of the touch sensing block.
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Abstract
A multi-touch sensing includes a voltage-current converter converting an input voltage into a current. A touch sensing block senses touch of an object. An amplifier includes a first input terminal connected to an output terminal of the voltage-current converter and to a first terminal of the touch sensing block. A second input terminal of the amplifier is grounded. An output terminal of the amplifier is connected to a second terminal of the touch sensing block.
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Citations
18 Claims
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1. A multi-touch sensing circuit comprising:
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a voltage-current converter that converts an input voltage into a current; a touch sensing block that is driven by the current and senses touch of an object by using a capacitor internally formed, wherein the capacitance of the capacitor varies according to the touch of an object; and an amplifier, wherein a first input terminal of the amplifier is connected to an output terminal of the voltage-current converter and to a first terminal of the touch sensing block, a second input terminal of the amplifier is grounded, and an output terminal of the amplifier is connected to a second terminal of the touch sensing block. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A touch sensing apparatus, comprising:
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a touch panel comprising; a plurality of substantially parallel row circuit lines; a plurality of substantially parallel column circuit lines insulated from the substantially parallel row circuit lines such that a capacitance is formed between a respective one of the substantially parallel row circuit lines and a respective one of the substantially parallel column circuit lines; a switching circuit coupled to each of the substantially parallel row circuit lines and to each of the substantially parallel column circuit lines and configured to provide an output circuit path to output the capacitance in response to switching circuit control signals; and an amplifier coupled to the touch panel in parallel, wherein a first input terminal of the amplifier is connected to a first terminal of the touch panel, a second input terminal of the amplifier is grounded, and an output terminal of the amplifier is connected to a second terminal of the touch panel, and wherein the touch panel is driven by a current received through the first input terminal. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A multi-touch sensing circuit comprising:
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a voltage-current converter that converts an input voltage into a current; a touch sensing block that is driven by the current and senses touch of an object by using a variation of capacitance of a capacitor internally formed; and an amplifier, wherein a first input terminal of the amplifier is connected to an output terminal of the voltage-current converter and to a first terminal of the touch sensing block, a second input terminal of the amplifier is grounded, and an output terminal of the amplifier is connected to a second terminal of the touch sensing block, wherein the voltage-current converter is an operational trans-conductance amplifier. - View Dependent Claims (16, 17, 18)
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Specification