Digitizer tablet with illuminable working surface

摘要

A digitizer tablet is provided in which the working surface is illuminated by a light source which includes optical structure located over the grid or electrode array of the position determining structure of the digitizer to provide a surface-lit tablet, or beneath the grid or electrode array to provide a back-lit tablet. Preferably, a space is provided adjacent the working surface to reduce undesirable lighting effects. A fiber optics panel or an electroluminescent panel may be used as the optical structure placed above or beneath the grid to illuminate the working surface. The position determining structure and the optical structure may be integrated into a single unit to form a digitizer with an illuminated working surface, or the optical structure may be provided as a separate unit for use with a digitizer to provide an illuminated working surface for the digitizer.