Heads-up display combiner utilizing a cholesteric liquid crystal

Details Heads-up display combiner utilizing a cholesteric liquid crystal Heads-up display combiner utilizing a cholesteric liquid crystal

1988-10-27

1990-02-13

Heyman, John S.

350334, 350352, 350174, G02F 113, G02B 2714

Patent

active

049001337

ABSTRACT:
A heads-up display (HUD) system employs a cholesteric liquid crystal combiner, an image source, and collimating optics to combine a generated image with an image in an observer's field of view. The cholesteric liquid crystal combiner has a bandwidth, B, around a primary wavelength of maximum reflection, and the image source projects its images within bandwidth B for high efficiency of reflection. Outside bandwidth B the cholesteric combiner has a high efficiency of transmission. Images from the image source are projected upon the combiner which reflects the images toward the observer, together with images from the outside environment in the line-of-sight of the observer. Collimating optics are used to focus the projected images at a distance away from the observer.

REFERENCES:
patent: 3679290 (1972-07-01), Adams et al.
patent: 3697154 (1972-10-01), Johnson
patent: 3711181 (1973-01-01), Adams, Jr. et al.
patent: 3915548 (1975-10-01), Opittek et al.
patent: 3957348 (1976-05-01), Saeva
patent: 4026641 (1977-05-01), Bosserman et al.
patent: 4269475 (1981-05-01), Ellis
patent: 4398799 (1983-08-01), Swift
patent: 4407564 (1983-10-01), Ellis
patent: 4447128 (1984-05-01), Ferrer
patent: 4582394 (1986-04-01), Boyd
patent: 4600271 (1986-07-01), Boyer et al.
patent: 4611877 (1986-09-01), Ellis
patent: 4613200 (1986-09-01), Hartman
"Holographic `Mirror` Helps Fighter Pilots to See", Engineering Materials Design, vol. 31, No. 4, Apr. 1987; p. 15.
Kahn, "Cholesteric Liquid Crystals for Optical Application", Appl. Phys. Letters, vol. 18, No. 6, Mar. 15, 1971, pp. 231-233.
IBM Technical Disclosure Bulletin, "Light Beam Combiner", vol. 15, No. 4, Sep. 1972.
Melamed et al., "Selected Optical Properties of Mixtures of Cholesteric Liquid Crystal", Applied Optics, vol. 10, No. 5, May 1971.
W. A. Shurcliff, "Polarized Light", chapter titled Retarders and Circular Polarizers, Harvard University Press, 1962.
P. G. deGennes, "The Physics of Liquid Crystals", chapter 1 titled Anisotropic Fluids: Main Types & Properties, Clanedon Press, 1974.
Jenkins & White, "Fundamentals of Optics", p. 567, McGraw-Hill, 1976.
D. M. Makow, "Peak Reflectance & Color Gamut of Superimposed Left- and Right-Handed Cholesteric Liquid Crystals", Applied Optics, vol. 19, No. 8, 4/15/1980.
J. Adams et al., "Cholesteric Films as Optical Filters", Journal of Applied Physics, vol. 42, No. 10, Sep. 1971.

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