Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Reexamination Certificate
2007-01-02
2007-01-02
Shalwala, Bipin (Department: 2629)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
C345S076000, C345S157000, C178S018010, C178S018110, C178S019040, C315S169300, C340S870030
Reexamination Certificate
active
10004054
ABSTRACT:
An enhanced touch-screen display system is disclosed for generating pixel coordinate estimates corresponding to a location on a display screen touched by a user. The system is an analog resistive touch-screen display system having a processor and associated software algorithms to allow for the calibration and validation of pixel coordinate estimates as an integral part of the real-time generation of the pixel coordinate estimates. Multiple calibrated pixel coordinate estimates are generated and processed at a pre-defined sampling rate to determine a valid pixel position to minimize sampling delays due to settling times. The x-axis position is also validated before the system attempts to generate a y-axis position to avoid the wasted time for generating y-axis estimates when x-axis estimates are corrupted. Noisy estimates are inherently reduced in the touch-screen display system by providing shunts across certain drivers in the system that also allow for detection of a “no touch” state.
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The Bergquist Company, “RTS™ Resistive Touch System” brochure.
ECN, “Human Input Devices Based on Resistive Touch Screen Sensors”, May 15, 2001.
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Degroot Jeffrey J.
Krajewski Thomas G.
American Standard International Inc.
Beres William J.
Kovalick Vincent E.
O'Driscoll William
Shalwala Bipin
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