Touc input screen using a light guide
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United States of America Patent
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N/A
Issued Date -
Dec 14, 2006
app pub date -
Sep 8, 2004
filing date -
Sep 22, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention relates to a display device having a touch screen (301). The touch screen comprises a first light guide (302), a second light guide (307) and a media (309) between the light guides for eliminating interference and reflections. A light source (308) is arranged to emit light (310) into the first light guide (302), which light is normally confined within the first light guide by means of total internal reflections. The second light guide (307) is arranged at the exterior face of the first light guide (302). When a user of the display device establishes physical contact with the touch screen (301), light is extracted from the first light guide and directed towards light detecting means (303). The light detecting means (303) are arranged for relating a light detecting event to an input position on the touch screen (301), where user interaction occurred.
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Cited Art Landscape
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