Interactive projection display system

Details Interactive projection display system Interactive projection display system

G - Physics

09

G

375/38

G09G 1/00 (2006.01) G06F 3/033 (2006.01)

Patent

CA 1113619

INTERACTIVE PROJECTION DISPLAY SYSTEM Abstract of the Disclosure 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 cross- wires 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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