Dispositif combiné de visualisation sur écran et de détection de position d'un repère par rapport à l'écran.

摘要

The invention relates to the exhibiting, by projection onto a screen, of an image managed by a computer system and to the entering of data into the computer system by moving a marker with respect to the screen. Its subject is an apparatus for displaying an image by projection onto a screen (50) incorporating a surface detector of infrared radiation (60) placed behind the projection objective (40) by virtue of a mirror (24) which separates the visible and infrared radiations. This display apparatus is supplemented with a steerable-radiation infrared emitter (70) with which the observer traces a marker on the screen which can be delineated with a visible index overlaid on the image.