Display apparatus and method for forming hologram suitable for t

Details Display apparatus and method for forming hologram suitable for t Display apparatus and method for forming hologram suitable for t

1997-03-14

2000-12-26

Schuberg, Darren

Optical: systems and elements

Holographic system or element

Head up display

359 15, 359 34, 349 5, 349 86, G03H 100

Patent

active

061668346

ABSTRACT:
A dichroic or trichromatic transparent display apparatus through which a background view is seen comprises a transparent substrate, a hologram formed on a rear face of the transparent substrate, a dispersion liquid crystal device disposed in front of a front face of the transparent substrate, a light source disposed for facing a side face of the transparent substrate and a transparent layer at least partially provided between the transparent substrate and the hologram. The refractive index of the transparent layer is smaller than that of the transparent substrate. A first light emitted from the light source and having a first wavelength is totally reflected by the boundary face between the transparent substrate and the transparent layer so that the first light moves to and is diffracted by a first region of the hologram where the transparent layer is not provided. A second light having a second wavelength is diffracted by a second region of the hologram where the transparent layer is provided. Thus, at least dichroic display is realized.

REFERENCES:
patent: 3572879 (1971-03-01), Nassenstein et al.
patent: 4942102 (1990-07-01), Keys et al.
patent: 4942112 (1990-07-01), Monroe et al.
patent: 5801793 (1998-09-01), Faris et al.
Smothers, et al., "Photopolymers for Holography", SPIE, vol. 1212 Practical Holography IV, 1990, pp. 20-39.
Communication from European Patent Office (Oct. 7, 1997) and attached Search Report.

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