Multicolor holographic element and apparatus for head-up display

Details Multicolor holographic element and apparatus for head-up display Multicolor holographic element and apparatus for head-up display

1988-12-12

1990-06-05

Arnold, Bruce Y.

350174, 350 37, 350 372, G03H 104, G02B 532

Patent

active

049308475

ABSTRACT:
A method for producing multicolor holographic optical elements useful in presentation of multicolor holographic images in a head-up display (HUD) system. Because of restricted geometries, such HUDs should allow for reconstruction of wavefronts employing all readout beams coming from the same direction, with the reconstructed wavefront being cast in a specified direction. A first method for producing a multicolor HOE satisfying these conditions makes all recording at the same wavelength but with varying record geometries. A second method for producing multicolor HOEs employs the same record geometries but uses varying wavelengths of recording light. This allows the recording to be made under conditions where the diffraction efficiency of the resulting HOEs is controlled, as are the displayed colors. As the consequence of this, the multicolor HOE can be made under conditions which allow the Bragg condition to be satisfied for each of the readout wavelengths allowing a uniformly bright multicolor wavefront to be reconstructed. A third method for producing such HOEs is to further change the recording geometry by redirecting all the recording wavefronts through the same angular interval. This minimizes the crosstalk which occurs between images recorded at different wavelengths. Also disclosed are apparatus for display of each of the HOEs.

REFERENCES:
patent: 4447111 (1984-05-01), Leib
patent: 4560233 (1985-12-01), Banbury
patent: 4575192 (1986-03-01), Duthie et al.
Dickson, L. D. et al., "Holography in the IBM 3687 Supermarket Scanner", IBM J. Res. Devel., vol. 26, No. 2, Mar. 1982, pp. 228-234.
"Computer-Originated Aspheric Holographic Optical Elements", Optical Engineering, Jan./Feb. 1982, vol. 21, No. 1, p. 133, Fairchild et al.

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