Combined device for screen display and for the detection of the

Details Combined device for screen display and for the detection of the Combined device for screen display and for the detection of the

1994-09-27

1995-08-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

2502032, 345158, G01C 2102, G01C 2124

Patent

active

054401143

ABSTRACT:
The disclosure relates to the display, by projection on a screen, of an image managed by a computer system and to the input of data into the data-processing system by the shifting of a location marker in relation to the screen. A device for display by the projection of an image on a screen incorporates a surface detector of infrared radiation positioned behind the projection objective by means of a mirror separating the visible radiation and the infrared radiation. This display device is complemented by an infrared emitter with directional radiation, with which the observer traces a location marker on the screen which may take the form of a visible pointer overprinted on the image.

REFERENCES:
patent: 3534359 (1970-10-01), Harris
patent: 4565999 (1986-01-01), King et al.
patent: 4988981 (1991-01-01), Zimmerman et al.
Patent Abstracts of Japan, vol. 16, No. 281, Jun. 23, 1992, & JP-A-4074285, Mar. 9, 1991, Hori Tetsuya, "Position Detecting and Display Device for Specific Person or Object".

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