Full color upconversion display

Details Full color upconversion display Full color upconversion display

1990-05-01

1991-03-26

Fields, Carolyn E.

Radiant energy

Invisible radiation responsive nonelectric signalling

Luminescent device

2504861, 340701, 340702, H04N 904

Patent

active

050031791

ABSTRACT:
Full color alphanumeric or image displays are produced by upconverting near infrared radiation into visible light. The display system includes an upconverting screen including a host material doped with rare earth ions. The screen may be divided into pixels which may be slectively excited by infrared radiation to emit visible light of a desired color. An intensity-modulated infrared laser beam is scanned across the surface of the screen to selectively excite the screen pixels and produce the desired image.

REFERENCES:
patent: 3725704 (1973-04-01), Buchanan et al.
patent: 4543308 (1985-09-01), Schumann et al.
patent: 4789785 (1988-12-01), Yamazaki et al.
patent: 4812659 (1989-03-01), Lindmayer
patent: 4812660 (1989-03-01), Lindmayer
Upconversion Use for Viewing and Recording Infrared Images; S. A. Pollack, D. B. Chang, I-Fu Shih, and R. Tzeng; Applied Optics/vol. 26, No. 20/Oct. 15, 1987; pp. 4400-4406.

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