Integrated light guide and touch screen frame and multi-touch determination method
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United States of America Patent
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Dec 8, 2015
Issued Date -
N/A
app pub date -
Jan 2, 2015
filing date -
Sep 23, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A touch screen assembly including a glass screen, LEDs, photo diodes, a transparent plastic frame surrounding the screen, and a light guide that guides light emitted by the LEDs to the photo diodes along light paths that go under the frame on one side, over the screen, and under the frame on the opposite side, and a processor operative to selectively activate LEDs and photo diodes, to identify location of an object touching the screen, based on amounts of light detected by activated photo diodes when light emitted by activated LEDs is blocked along its light path by the object, and to recognize the object touching the frame, based on amounts of light detected by activated photo diodes when light emitted by activated LEDs is absorbed along its light path by the object, thereby providing light-based touch sensitivity to the screen and to the frame.
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