Touch panel apparatus

Details Touch panel apparatus Touch panel apparatus

G - Physics

08

C

340/135.1

G08C 21/00 (2006.01) G01V 8/20 (2006.01) G06F 3/033 (2006.01)

Patent

CA 1289216

ABSTRACT OF THE DISCLOSURE A touch panel apparatus which, when attached to a display having a substantially cylindrical display surface, reduces the effects of parallax by having a first set of plural light source - photo-detector pairs provided adjacent the cylindrical display surface for generating and detecting a first set of parallel light beams passing across the cylindrical display surface of the display, a second set of plural light source - photo-detector pairs provided adjacent the cylindrical display surface for generating and detecting a second set of parallel light beams passing across the cylindrical display surface of the display, wherein the first and second sets of light beams are non-parallel relative to the principal direction of cylindrical curvature of the cylindrical display surface, and a process circuit connected to the first and second sets of light source - photo-detector pairs for determining coordinates by detecting interrupted light beams.

589469

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