A viewer configured to rest upon a surface that bears coded data, the viewer including: sensing means configured to sense at least some of the coded data when the viewer is resting upon the surface; processing means for decoding at least some of the sensed coded data; ...http://www.google.nl/patents/US7019319?utm_source=gb-gplus-sharePatent US7019319 - Viewer configured to display, and method of displaying, information on a display to at least partially take into account a position of the viewer relative to a surface
Viewer configured to display, and method of displaying, information on a ...
