07310090 is referenced by 14 patents and cites 10 patents.

A switch panel having a touch plate, image generator, and imaging system. The touch plate includes an optically transparent layer having first and second sides. The optically transparent layer having an index of refraction greater than that of air. A light source generates a light signal that is reflected between the first and second sides of the touch plate within the transparent layer. The imaging system records an image of the first surface. An image generator displays an image that includes a plurality of button positions to a person viewing the touch plate from the first side. A portion of the light signal is reflected toward the second surface at an angle greater than the critical angle in the optically transparent layer when the first surface is touched. The imaging system determines the location of the touch from the location of the reflected light.

Optical generic switch panel
Application Number
Publication Number
7310090 (B2)
Application Date
March 25, 2004
Publication Date
December 18, 2007
Kean Loo Kah
Jalan Batu Uban
Chin Hin Oon
Lorong Midlands
Chi Mun Ho
Jalan Merbok Dua
Avago Technologies ECBM IP
G06F 3/042
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