Interactive projection display system

Details Interactive projection display system Interactive projection display system

1979-09-28

1981-06-23

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340707, 340783, 33 1M, 178 18, G06F 314

Patent

active

042753953

ABSTRACT:
An interactive projection display system having a light pen device for use thereon is described. The projection display system has an image of a light valve on a projection screen which is formed by visible light of specified wavelengths. The projection screen also has a translatable crosswire image thereon which is formed by radiation which includes the visible light used to form the light valve image and an additional spectral component. The light pen device is sensitive to this additional spectral component. In a preferred embodiment, the image of the light valve and the crosswires are formed with white light (0.3 to 0.7 microns). The additional spectral component used for the crosswire image and the light pen sensing is a band of near-IR radiation (0.7 to 1 micron).

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patent: 3692936 (1972-09-01), Moffitt
patent: 3775005 (1973-11-01), Szabo
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patent: 3825730 (1974-07-01), Worthington, Jr. et al.
patent: 3883861 (1975-05-01), Heartz
patent: 3932862 (1976-01-01), Graven
patent: 4020281 (1977-04-01), Davis, Jr.
patent: 4071690 (1978-01-01), Joannu

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