Sensing device for optical pointing devices such as an optical mouse
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United States of America Patent
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Jun 15, 2004
Grant Date -
Jun 5, 2003
app pub date -
Dec 5, 2001
filing date -
Dec 5, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
There is described a sensing device for an optical pointing device comprising a plurality of pixels, each one of the pixels comprising a photosensitive element for generating a pixel output signal in response to radiation reflected from an illuminated portion of a surface, the sensing device further comprising processing means for determining, based on said pixel output signals, a measurement of relative motion between the sensing device and the illuminated surface and for generating cursor control signals based on this measurement. The sensing device further comprises circuit means for summing the pixel output signals of subsets of pixels including at least two pixels and for generating, for each of the subsets of pixels, a summed output signal, the processing means determining the measurement of relative motion based on the summed output signals.
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