The invention relates to a display system which comprises a display screen (101) for displaying a graphical representation. The surface of the display screen has relief (103, 104) in order to provide tactile and/or visual guidance to the user. The display system according to the invention comprises a...http://www.google.com.hk/patents/US20050030292?utm_source=gb-gplus-share專利 US20050030292 - Display system with tactile guidance
