TOUCH SCREEN REAR PROJECTION DISPLAY

摘要

A touch screen display includes a diffuser screen, a projector, a camera, an infrared (IR) light source, and a controller. The diffuser screen has a front surface and a rear surface. The projector is disposed to project images onto the rear surface of said diffuser screen, and the images are visible to a user through the diffuser screen. The camera is disposed behind the diffuser screen and aimed to capture images of a pointer near the front surface of the diffuser screen. The IR light source is disposed to direct IR light toward the rear surface of the diffuser screen, so the rays of incident IR light form an acute angle with respect to the rear surface of the diffuser screen, and so that any of the incident IR light reflected off the rear surface of the diffuser screen does not enter the camera.

主权项

1. A touch screen display comprising:
a diffuser screen having a front surface to be viewed by a user and a rear surface; a projector disposed to project images onto the rear surface of said diffuser screen, said images being visible to said user through said diffuser screen; a camera disposed behind said diffuser screen and aimed to capture images of a pointer near said front surface of said diffuser screen; an infrared (IR) light source disposed to direct IR light toward said rear surface of said diffuser screen, the rays of incident IR light forming an acute angle with respect to said rear surface of said diffuser screen, such that any of said incident IR light reflected off said rear surface of said diffuser screen does not enter said camera; and a controller operative to control said projector responsive to said images of said pointer near said front surface of said diffuser screen.