A light-pen system for use in connection with a video display installation (10) includes a projector (18A) for receiving an externally generated video signal and for projecting a video image onto a screen (12). Illustratively, the light-pen system includes a source of a beam of radiation (20) for forming a spot (22) at a desired location on the screen. The source of radiation may provide a well collimated visible optical beam or colinear beam of visible and infrared radiation. An adjunct video camera (24A) is used to detect the location of the spot (22) on the screen (12) and to produce an output signal indicative of the location of the spot. A host computer or graphics overlay generator (15) receives the position indicative output signal and modifies the externally generated video signal so as to modify the displayed video image.
申请公布号
DE69015197(D1)
申请公布日期
1995.01.26
申请号
DE1990615197
申请日期
1990.04.18
申请人
BELL COMMUNICATIONS RESEARCH, INC., LIVINGSTON, N.J., US