Illuminated display apparatus

Details Illuminated display apparatus Illuminated display apparatus

1976-06-25

1978-04-18

Engle, Samuel W.

Card, picture, or sign exhibiting

Illuminated sign

External light source

340103, 353 97, 40582, 40612, G09F 1300, B06Q 100, G03B 2114

Patent

active

040843394

ABSTRACT:
An illuminated display apparatus includes a laser projector and a retro-reflective screen onto which the beam from the laser projector is projected. A beam deflection device may be disposed between the projector and the screen. The beam deflection device may be associated with a modulator for modulating the intensity of the light beam. A beam spreader and a mask may be substituted for the deflection device and modulator, the shadow of the mask appearing on the screen.

REFERENCES:
patent: 2341223 (1944-02-01), Lillie
patent: 2380667 (1945-07-01), Morrison
patent: 3090280 (1963-05-01), Winter
patent: 3161356 (1964-12-01), Brenner
patent: 3790431 (1974-02-01), Tung
patent: 3802944 (1974-04-01), Tung
patent: 3844635 (1974-10-01), Atkins
Kennedy, et al., "Laser Display Systems" Instruments & Control Systems--Dec. 1968, pp. 59-63.
Smith, "Laser Beam Deflection Device" IBM Technical Disclosure Bulletin, vol. 8, No. 1, 6/65, p.108.
Knox, et al.; "A T.V. Rate Laser Scanner" RCA Review, vol. 33, Dec. 1972, pp. 623-673.

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