Touch screen apparatus and method therefore
First Claim
1. An apparatus responsive to a resistive touch screen, the resistive touch screen having a first conductive layer and a second conductive layer separated from one another under quiescent conditions, the first and second conductive layers each having a first and second electrode, the apparatus comprising a detection circuit coupled for providing a first reference voltage to the first and second electrodes of the first conductive layer and providing a second reference voltage to the first and second electrodes of the second conductive layer wherein said detection circuit maintains said first and second reference voltages substantially constant during operation of the resistive touch screen.
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Accused Products
Abstract
Methods and apparatus are provided for an apparatus for inputting data. The apparatus comprises a detection circuit for providing a first reference voltage to a first and a second electrode of a first conductive layer of a resistive touch screen and providing a second reference voltage to a first and a second electrode of a second conductive layer of the resistive touch screen. The detection circuit maintains the first and second reference voltages under quiescent conditions and when the first and second conductive layers couple together. The method includes applying substantially equal voltages to the first and second electrodes of the first conductive layer of the resistive touch screen. Substantially equal voltages are applied to the first and second electrodes of the second conductive layer of the resistive touch screen. Approximately zero current is conducted in the first and second conductive layers under quiescent conditions.
26 Citations
22 Claims
- 1. An apparatus responsive to a resistive touch screen, the resistive touch screen having a first conductive layer and a second conductive layer separated from one another under quiescent conditions, the first and second conductive layers each having a first and second electrode, the apparatus comprising a detection circuit coupled for providing a first reference voltage to the first and second electrodes of the first conductive layer and providing a second reference voltage to the first and second electrodes of the second conductive layer wherein said detection circuit maintains said first and second reference voltages substantially constant during operation of the resistive touch screen.
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14. A method of operating a resistive touch sensitive screen for increased security and lower power consumption, the resistive touch screen comprising a first conductive layer and a second conductive layer, the first conductive layer having a first electrode and a second electrode, the second conductive layer having a first electrode and a second electrode, the method comprising the steps of:
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applying substantially equal voltages to the first and second electrodes of the first conductive layer; and
applying substantially equal voltages to the first and second electrodes of the second conductive layer such that approximately zero current is conducted in the first and second conductive layers under quiescent conditions. - View Dependent Claims (15, 16, 17)
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18. An apparatus comprising:
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a resistive touch screen;
a substrate;
a plurality of current to voltage converters on said substrate responsive to said resistive touch screen; and
a plurality of wires coupling said resistive touch screen to said plurality of current to voltage converters wherein a voltage each of said plurality of wires remains substantially constant during operation of said resistive touch screen. - View Dependent Claims (19, 20, 21, 22)
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Specification