Illumination system for a flat-panel picture display device

Details Illumination system for a flat-panel picture display device Illumination system for a flat-panel picture display device

1996-08-23

1998-03-17

Gross, Anita Pellman

Liquid crystal cells, elements and systems

Particular structure

Particular illumination

349 57, 362 19, 362 26, 362 31, G02F 11335, F21V 914, F21V 704, G01D 1128

Patent

active

057293112

ABSTRACT:
An illumination system (3) includes an optical waveguide (11) and a light source (9) whose light is coupled into the optical waveguide (11) via at least one end face (13) of the optical waveguide (11). The optical waveguide (11) is provided with recesses (19) which are subsequently filled up with a material which is different from that of the optical waveguide (11). One of the two materials is isotropic and has refractive index n.sub.p and the other material is anisotropic and has refractive indices n.sub.o and n.sub.e. For the refractive indices it should hold that n.sub.o or n.sub.e is equal or substantially equal to n.sub.p in order that there is separation of polarization at the interfaces between isotropic and anisotropic material. Further, a flat-panel picture display device includes such an illumination system.

REFERENCES:
patent: 4212048 (1980-07-01), Castleberry
patent: 4985809 (1991-01-01), Matsui
patent: 5339179 (1994-08-01), Rudisill et al.
patent: 5349503 (1994-09-01), Blonder et al.
patent: 5394255 (1995-02-01), Yokota et al.
patent: 5396350 (1995-03-01), Beeson et al.
patent: 5587816 (1996-12-01), Gunjima et al.

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