System and Method for Determining Touch Positions Based on Position-Dependent Electrical Charges
First Claim
1. An apparatus for determining the position of a touching implement on the sensing surface of a device, comprising:
- a signal generation circuit to create a position-dependent electrical charge on a touching implement that has engaged an area on the sensing surface of the device; and
a signal processing circuit, responsive to the position-dependent electrical charge, to locate the area on the sensing surface of the device.
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Accused Products
Abstract
Systems and methods determine the position of a touch on a surface of a device, such as a touch-sensitive device, by using position-dependent electrical charges. In such a method, the position of a touching implement is determined on the sensing surface of a device. The method includes generating signals on the surface of the device to create a position-dependent electrical charge on the touching implement; and measuring the position-dependent electrical charge to indicate a coordinate on the sensing surface for establishing the position of the touching implement.
102 Citations
25 Claims
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1. An apparatus for determining the position of a touching implement on the sensing surface of a device, comprising:
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a signal generation circuit to create a position-dependent electrical charge on a touching implement that has engaged an area on the sensing surface of the device; and a signal processing circuit, responsive to the position-dependent electrical charge, to locate the area on the sensing surface of the device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for determining the position of a touching implement on the sensing surface of a device, comprising:
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a signal drive circuit, coupled to the surface of the device, to generate signals on the surface for creating a position-dependent electrical charge on the touching implement; and a charge measurement circuit, coupled to the surface of the device, to measure the position-dependent electrical charge for indicating a coordinate on the sensing surface for establishing the position of the touching implement. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for determining the position of a touching implement on the sensing surface of a device, comprising:
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generating signals on the surface of the device to create a position-dependent electrical charge on the touching implement; and measuring the position-dependent electrical charge to indicate a coordinate on the sensing surface for establishing the position of the touching implement.
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21. A method for determining the position of a touching implement on a sensing surface of a touch-sensitive device, the method comprising:
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(a.) during a first time period, connecting two adjacent corners of the sensing surface to a reference voltage while maintaining the two opposite corners in a floating state disconnected from any voltage source, the first time period being sufficient to raise the potential of the sensing surface edge between the two adjacent corners to a level at or near the reference voltage while the potential of the sensing surface edge between the two opposite corners remains at a level lower than the reference voltage commensurate with an R-C time constant delay across the sensing surface; and (b) at the end of the first time period, disconnecting the two adjacent corners from the reference voltage, and connecting the sensing surface to an integrator capacitor for a second time period sufficient for the integrator capacitor to accumulate the charge from the sensing surface; (c) repeating steps (a) and (b) to accumulate sufficient charge in the integrator capacitor for measurement, and in response thereto measuring the charge stored in the integrator capacitor. - View Dependent Claims (22, 23, 24, 25)
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Specification