Liquid crystal cells – elements and systems – Particular structure – Particular illumination
Patent
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.
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Boots Henri M. J.
Broer Dirk J.
Seppen Constance J. E.
Gross Anita Pellman
Slobod Jack D.
U.S. Philips Corporation
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