Holographic high contrast viewing screen embedded in a liquid cr

Details Holographic high contrast viewing screen embedded in a liquid cr Holographic high contrast viewing screen embedded in a liquid cr

1995-10-20

1997-05-20

Sikes, William L.

Liquid crystal cells, elements and systems

Particular structure

Particular illumination

359 15, 359599, 349130, G02F 11335, G02F 11337, G02B 532

Patent

active

056317549

ABSTRACT:
Systems and methods for shaping light from a liquid crystal display are described. A holographic high contrast viewing screen embedded in a liquid crystal display includes a first substrate; a first electrode connected to said first substrate; a light shaping holographic surface relief diffuser connected to said first electrode, said light shaping holographic surface relief diffuser having a first orientation and a first refractive index; a liquid crystal adjacent said light shaping holographic surface relief diffuser, the liquid crystal having a second refractive index that is substantially equal to the first refractive index, in the absence of a driving voltage applied to the first electrode and the second electrode; an alignment layer adjacent said liquid crystal, said alignment layer having a second orientation that is substantially orthogonal to said first orientation; a second electrode connected to said alignment layer; and a second substrate connected to said second electrode. The second refractive index varies as a function of the driving voltage, which is applied between the first electrode and the second electrode. The systems and methods provide advantages in that the field of view, including the horizontal and vertical extent, can be determined, in advance by the manufacturer.

REFERENCES:
patent: 4277144 (1981-07-01), Saurer et al.
patent: 5139340 (1992-08-01), Okumura
patent: 5317435 (1994-05-01), Kasazumi et al.
patent: 5418631 (1995-05-01), Tedesco
patent: 5471327 (1995-11-01), Tedesco
patent: 5528402 (1996-06-01), Parker

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