Optical touch panel
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United States of America Patent
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Jan 1, 2013
Grant Date -
Aug 4, 2011
app pub date -
Dec 14, 2010
filing date -
Jan 29, 2010
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical touch panel comprises a transparent plate, a plurality of light-emitting devices and a plurality of light-receiving devices arranged around the transparent plate, a first substrate to which some of the light-receiving devices are fixed, and a second substrate to which others of the light-receiving devices are fixed. Each of the substrates has a surface layer that has a surface roughness which causes diffuse reflection of the same kind of light as light emitted by the light-emitting devices. A region having the surface roughness on a surface of the surface layer includes a region on the surface of the surface layer included in directivity ranges of the light-receiving devices fixed to the substrate.
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