Chromatically corrected directional diffusing screen

Optical: systems and elements – Holographic system or element – Copying by holographic means

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359 15, 359 28, 359599, G03H 120

Patent

active

050467930

ABSTRACT:
A holographic diffuser provides a high degree of chromatic correction, or color balance, within a selected eyebox and the ability to generate more than one specific eyebox for multiple observer applications. The strength of these gratings can be varied to modify the diffraction efficiency for each color so that the balance of colors can be varied within the eyebox. This balancing of colors can be used, for example, to compensate for color imbalance within the light source or image generator. Illuminating a first holographic medium produces a first real image of a diffusing screen in a define eyebox. A second hologram is recorded in the holographic medium using the real image produced by the first hologram as an object such that when the holographic medium is illuminated, it produces a second real image of a diffusing screen in the define eyebox. A third hologram is recorded in the holographic medium using the second real image as an object. The third hologram is formed by multiple exposures of the holographic medium with a plurality of selected spectral components. The plurality of selected spectral components comprises optical wavelengths that may correspond to the colors red, green and blue, respectively. The third hologram may be formed by exposing the holographic medium with a single optical wavelength with first, second and third angles of incidence being selected for each exposure of the holographic medium to the optical wavelength.

REFERENCES:
patent: 3708217 (1973-01-01), McMahon
patent: 3758186 (1973-09-01), Brumm
patent: 4372639 (1983-02-01), Johnson
patent: 4586780 (1986-05-01), Chern et al.
patent: 4586781 (1986-05-01), Gunther et al.
patent: 4602843 (1986-07-01), Glaser-Inbari
patent: 4610499 (1986-09-01), Chern et al.
"Holographic and Interferometric Viewing Screens by Meyerhofer", Applied Optics, vol. 12, No. 9, Sep. 1973, pp. 2180-2184.
"Development of a High-Gain, Golographic Grating Projection Screen," by Umstatter & Trolinger, SPIE, vol. 676, Ultraprecision Machining & Automated Fabrication of Optics (1986) pp. 17-23.

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