Input sensing circuit and touch panel including the same
First Claim
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1. A touch panel comprising:
- a first substrate on which a plurality of first electrode lines are arranged in parallel;
a second substrate which is spaced apart from the first substrate and on which a plurality of second electrode lines perpendicular to the first electrode lines are arranged in parallel;
a dielectric layer interposed between the first substrate and the second substrate;
a driving unit which applies a driving voltage for driving the dielectric layer to all or a portion of capacitance nodes formed at intersections between the plurality of first electrode lines and the plurality of second electrode lines; and
a sensing unit which determines whether there is an input on the touch panel, based on a change in capacitance at the capacitance nodes,wherein the sensing unit comprises a charge pump to which an output signal from the intersections between the first electrode lines and the second electrode lines is input as a charge source according to the change in capacitance at the capacitance nodes in response to a sensing signal that is sequentially applied to the first electrode lines, the sensing signal having a sensing voltage different from a driving voltage, andthe sensing unit determines whether there is the input on the touch panel, based on an output voltage of the charge pump.
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Abstract
An input sensing device for sensing an input on a touch panel, and touch panel are provided. The input sensing device has a capacitance node and includes a charge pump to which an output signal from a first electrode of the capacitance node is input as a charge source in response to a sensing signal applied through a second electrode of the capacitance node. The input sensing device determines whether there is an input on the touch panel, based on an output voltage of the charge pump.
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Citations
13 Claims
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1. A touch panel comprising:
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a first substrate on which a plurality of first electrode lines are arranged in parallel; a second substrate which is spaced apart from the first substrate and on which a plurality of second electrode lines perpendicular to the first electrode lines are arranged in parallel; a dielectric layer interposed between the first substrate and the second substrate; a driving unit which applies a driving voltage for driving the dielectric layer to all or a portion of capacitance nodes formed at intersections between the plurality of first electrode lines and the plurality of second electrode lines; and a sensing unit which determines whether there is an input on the touch panel, based on a change in capacitance at the capacitance nodes, wherein the sensing unit comprises a charge pump to which an output signal from the intersections between the first electrode lines and the second electrode lines is input as a charge source according to the change in capacitance at the capacitance nodes in response to a sensing signal that is sequentially applied to the first electrode lines, the sensing signal having a sensing voltage different from a driving voltage, and the sensing unit determines whether there is the input on the touch panel, based on an output voltage of the charge pump. - View Dependent Claims (3, 4, 5, 6)
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2. The touch panel of claim , wherein the sensing unit comprises a plurality of charge pumps that are respectively coupled to the second electrode lines.
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7. A touch panel comprising:
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a touch panel body comprising a first substrate and a second substrate spaced apart from the first substrate by a gap, a plurality of electrode pairs formed on the first substrate and the second substrate, and electrorheological fluid disposed in the gap between the first substrate and the second substrate; a driving unit which applies a driving voltage for driving the electrorheological fluid to all or a portion of the plurality of electrode pairs; and a sensing unit which applies a sensing signal to the plurality of electrode pairs, and determines whether there is an input on the touch panel based on a change in capacitance due to a change in thickness of the gap between the first substrate and the second substrate, in response to the sensing signal, the sensing signal having a sensing voltage different from the driving voltage, wherein the sensing unit comprises a charge pump to which an output signal from the electrode pairs is input as a charge source, in response to the sensing signal, and the sensing unit determines whether there is the input on the touch panel, based on an output voltage from the charge pump. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A touch panel comprising:
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a first substrate on which M first electrode lines extend in a first direction and are arranged in parallel, wherein M is an integer equal to or greater than 2; a second substrate spaced apart from the first substrate, on which N second electrode lines extend in a second direction orthogonal to the first direction and are arranged in parallel, wherein N is an integer equal to or greater than 2; electrorheological fluid disposed in a gap between the first substrate and the second substrate; a pulse generating circuit unit which generates a driving pulse voltage for driving the electrorheological fluid and a sensing pulse voltage for determining whether there is an input on the touch panel; a pulse applying circuit unit which combines the driving pulse voltage with the sensing pulse voltage and apply the combined voltage to the M first electrode lines; and a sensing circuit unit which senses a change in capacitance at capacitance nodes at intersections between the M first electrode lines and the N second electrode lines, in response to the sensing pulse voltage, wherein the sensing circuit unit comprises N charge pumps that are operatively connected to the N electrode lines.
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Specification