Digital controller for a true multi-point touch surface useable in a computer system
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United States of America Patent
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Nov 8, 2011
Grant Date -
Jul 10, 2008
app pub date -
Jan 8, 2007
filing date -
Jan 8, 2007
priority date (Note) -
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Abstract
An embodiment of an improved touch surface controller for controlling a multi-point touch surface such as a touch screen or a touch pad in a computer system is disclosed. The improved touch system controller detects signal capacitance from the pixels in the touch surface digitally, and therefore is easier and simpler to implement then previous approaches relying on analog detection and processing. Specifically, signal capacitance is measured by measuring a number of clock cycles taken to discharge or charge the input node of a comparator. Embodiments of the disclosed touch surface controller are particularly useful in the context of detecting multiple simultaneous touches on the touch surface.
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