Display Device Provided With Optical Input Function
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United States of America Patent
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Issued Date -
May 14, 2009
app pub date -
Oct 29, 2008
filing date -
Oct 30, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In a display device, an object approaching a display unit is detected by referring to an image picked up by the display unit. An alternating current drive circuit drives an alternating current signal to the display unit, so that a detection circuit detects an amplitude change or a phase shift. Alternatively, a liquid crystal panel is vibrated at a predetermined frequency, so that the strength of the frequency of the vibration sound is detected. This makes it possible to more accurately detect the timing when the object touches the display unit.
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