LIGHT GUIDE ASSEMBLY FOR OPTICAL TOUCH SENSING, AND METHOD FOR DETECTING A TOUCH

摘要

A light guide assembly (2) for use in a touch sensitive area (3) of an optical touch sensing device (1) for touch screens is configured to receive light, to allow the light thereby received to propagate in the light guide assembly, and to deliver the light thereby propagated in the light guide assembly further out of the light guide assembly, wherein the optical touch sensing device is configured to detect the presence of an external object (10) on the basis of changes in the light delivered further out of the light guide assembly due to interaction of the light with the external object. The light guide assembly comprises a plurality of light guide stripes (4, 5) for controlling the light propagation in the light guide assembly.