TOUCH SCREEN DETECTION AND DIAGNOSTICS
First Claim
1. A method comprising:
- driving a first current at a touch screen, a magnitude of the first current based on a presence of a contact event to the touch screen;
generating a second current proportional to the first current; and
detecting a contact event to the touch screen based on the second current.
31 Assignments
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Accused Products
Abstract
A method includes driving a current through a touch screen that is based on contact of the touch screen, generating a proportional second current, and detecting contact of the touch screen from the second current. Another method includes providing a touch screen with parallel plates, disabling contact detection when a plate voltage is lower than a threshold voltage, and enabling contact detection when the plate voltage is at least equal to the threshold voltage. A device includes a first node and a second node coupled to a touch screen, a third node, a first current mirror coupled to the second node and the third node configured to generate a current at the third node that is proportional to a second current at the second node, and a detection circuit that provides a signal based on the first current that indicates contact of the touch screen.
81 Citations
20 Claims
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1. A method comprising:
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driving a first current at a touch screen, a magnitude of the first current based on a presence of a contact event to the touch screen; generating a second current proportional to the first current; and detecting a contact event to the touch screen based on the second current. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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providing a touch screen comprising a pair of parallel conductive plates; disabling detection of a contact event to the touch screen responsive to a select plate of the pair of parallel conductive plates having a voltage lower than a threshold voltage; and enabling detection of a contact event to the touch screen responsive to the select plate having a voltage at least equal to the threshold voltage. - View Dependent Claims (9, 10, 11)
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12. A device comprising:
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a first node adapted to be coupled to an interface of a touch screen; a second node adapted to be coupled to the interface of the touch screen; a third node; a first current mirror coupled to the second node and the third node, the first current mirror configured to generate a first current at the third node that is proportional to a second current at the second node; and a detection circuit adapted to provide a signal based on the first current, the signal indicating whether a contact event is present at the touch screen. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification