Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1989-12-22
1991-11-19
Hille, Rolf
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 73, 359 93, 359497, G02F 113
Patent
active
050661086
ABSTRACT:
A display having a linearly polarized image source, a quarter-wave retarder for transforming the linearly polarized illumination to circularly polarized illumination, imaging elements responsive to the circularly polarized illumination for producing viewable circularly polarized imaging illumination, and a circular imaging illumination to viewable linearly polarized imaging illumination. The circular polarizer includes a quarter-wave retarder for transforming the circular light to linearly polarized light, and a linear polarizer configured to transmit the linearly polarized imaging illumination. Contrast enhancement is achieved by the circular polarizer which functions to block ambient light reflected from the front element of the imaging elements as a result of transmission through the circular polarizer.
REFERENCES:
patent: 3503667 (1970-03-01), Tiedeman
patent: 4088400 (1978-05-01), Assonline et al.
patent: 4093356 (1978-06-01), Bigelow
patent: 4398805 (1983-08-01), Cole
patent: 4726663 (1988-02-01), Bouzak
patent: 4772104 (1988-09-01), Buhrer
patent: 4884876 (1989-12-01), Lipton et al.
Alkov Leonard A.
Denson-Low Wanda K.
Hille Rolf
Ho Tan
Hughes Aircraft Company
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