Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1996-01-30
1997-09-02
Dzierzynski, Paul M.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 22, 349113, G03H 126, G02B 532
Patent
active
056638167
ABSTRACT:
A liquid crystal display device (30) that is illuminatable by diffuse ambient light comprises a liquid crystal panel (32) and a reflective holographic optical element (34). Diffuse ambient light illuminating the front side (36) of the liquid crystal panel and traversing the liquid crystal panel is received at a reflection site (66) and is redirected with a reflection pattern (68) to retraverse the liquid crystal panel to form a bright pixel for a display. By concentrating diffuse light within a preferential reflection pattern, the reflective holographic optical element provides enhanced brightness for viewing the display under ambient light conditions. In one aspect, the reflective holographic optical element is a transflector (158, 208) and is combined with an internal light source (170, 220) for illuminating the display using either reflected ambient light or backlighting.
REFERENCES:
patent: 3675990 (1972-07-01), Kogelnik et al.
patent: 4832459 (1989-05-01), Harper et al.
patent: 4978183 (1990-12-01), Vick
patent: 4984872 (1991-01-01), Vick
patent: 5011244 (1991-04-01), Smith et al.
patent: 5198912 (1993-03-01), Ingwall et al.
patent: 5267060 (1993-11-01), Colton
patent: 5418631 (1995-05-01), Tedesco
patent: 5471327 (1995-11-01), Tedesco et al.
Tedesco, J.M., et al., "5.3: Holographic Diffusers for LCD Backlights and Projection Screens", SID 93 Digest, (1993) pp. 29-32.
Magarinos, et al., Optical Engineering, "Holographic Mirrors," vol. 24, No. 5, Sep./Oct. 1985, pp. 769-780.
Ingwall et al., SPIE, "Hologram Recording With a New Polaroid Photopolymer System," vol. 523, (1985), pp. 306-312.
Ingwall et al., SPIE, "The Mechanism of Hologram Formation in DMP-128 Photopolymer," vol. 883, (1988), pp. 102-105.
Ingram et al., SPIE, "Hologram: Liquid Crystal Composites," vol. 1555, (1991), pp. 279-290.
Chen Alan G.
Jelley Kevin W.
Vallaith George T.
Dzierzynski Paul M.
Fekete Douglas D.
Jr. John Juba
Motorola Inc.
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