METHOD OF ILLUMINATING SEMI TRANSPARENT AND TRANSPARENT INPUT DEVICE AND A DEVICE HAVING A BACK ILLUMINATED MAN MACHINE INTERFACE

摘要

A handheld input device that comprises a touchpad having at least partly transparent panel with front and back sides which respectively face a front space and a back space, front and back touch sensing surfaces formed respectively at the front and back sides to detect a plurality of front touch events and a plurality of back touch events respectively on the front and back sides, and at least one back illumination source, mounted in the handheld device to illuminate fingertips facing the back touch sensing surface at the back space.