G - Physics – 02 – B
Patent
G - Physics
02
B
88/121, 88/0.14
G02B 5/32 (2006.01) G02B 5/02 (2006.01) G02B 27/42 (2006.01)
Patent
CA 1328752
FULL-COLOR ZERO-ORDER SUPPRESSED DIFFRACTION OPTICS DIFFUSING SCREEN/LOUVER FILTER LAMINATE ABSTRACT OF THE DISCLOSURE A full-color holographic screen laminate is dis- closed, having a well-defined exit pupil, off-axis viewing capabilities, high and uniform gain, and low backscatter, and in addition the capabilities of blocking the zero- order beam and allowing full-color viewing. The laminate in one preferred form includes several layers, including a plano-convex focusing lens, a directional diffraction optics diffusing screen, and a thin plane-parallel lami- nate consisting of a plano-concave cylindrical lens, a slanted louver filter, and a plano-convex cylindrical lens. The lenses can be made out of contrast enhancement material. The louver filter is curved so that the louvers are oriented parallel to the line of sight across the entire louver surface. The plano-convex lens focuses the light, the diffusion screen bends and diffuses the light, the louver filter passes the diffracted light but blocks the zero-order light from entering the ambient, and the contrast enhancement lens increases the overall contrast of the screen.
604212
Hughes Aircraft Company
Sim & Mcburney
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