Bidirectional dichroic circular polarizer and reflection/transmi

Details Bidirectional dichroic circular polarizer and reflection/transmi Bidirectional dichroic circular polarizer and reflection/transmi

1999-12-16

2000-11-14

Parker, Kenneth

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

349162, 349117, G02F 11335

Patent

active

061477346

ABSTRACT:
In a combination reflective/transmissive liquid-crystal display device, when the liquid-crystal display device is in the transmissive mode, unpolarized light from a light source passes through a circular polarization separating layer, a half-wavelength layer in the off condition, and a first bidirectional dichroic circular polarizing layer and then strikes a liquid-crystal cell, the retardation value of which, as a result of an electrical field applied thereto, changes so as to shift light 0 to .pi., thereby modulating incident circularly polarized light, which is caused to strike a second bidirectional dichroic circular polarizing layer, the transmitted component in which serves as the display light. In the reflective mode, external light passes through the second bidirectional dichroic circular polarizing layer, the liquid-crystal cell, the half-wavelength layer which has been turned on, and the first bidirectional dichroic circular polarizing layer, and is then reflected by the circular polarization separating layer so as to become circularly polarized light that also serves as the display light.

REFERENCES:
patent: 5828471 (1998-10-01), Davis et al.
patent: 5986730 (1999-11-01), Hansen et al.
patent: 5995180 (1999-11-01), Moriwaki et al.
patent: 5999240 (1999-02-01), Sharp et al.

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