POWERED CARD WITH TOUCH DISPLAY
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United States of America Patent
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N/A
Issued Date -
Aug 20, 2015
app pub date -
Aug 28, 2013
filing date -
Sep 4, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Powered cards comprising a substrate, a touch-sensitive display, display driver circuitry, a power source and a controller are described. The controller activates the display driver circuitry when a user of the card touches the display. The touch-sensitive display can be a liquid crystal display LCD which does not comprise a touch sensitive sensor separate from the display. Touch can be detected by measuring the capacitance between a conductor or segment and the common conductor of the display, wherein capacitance between a conductor segment and the common conductor is higher when the display is touched in an area near the segment. Capacitance between a conductor segment and the common conductor can be determined by measuring the time required for a segment of the display to transition to an on state during switching while the display is being driven by the display driver circuitry.
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