Reflection type liquid crystal display device

Details Reflection type liquid crystal display device Reflection type liquid crystal display device

1999-04-12

2000-11-14

Dudek, James A.

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

349117, 349121, 349113, G02F 11335

Patent

active

061477273

ABSTRACT:
A reflection type liquid crystal display device including a panel, a polarizing plate, and a 1/4 wavelength plate, with the polarizing plate and the 1/4 wavelength plate being placed upon the panel. The panel includes a transparent first substrate disposed at the external light incoming side; a second substrate opposing the first substrate, with the first substrate and the second substrate being put together so as to be separated by a predetermined distance; nematic liquid crystals kept in the gap between the substrates, with the molecules thereof having a twisted orientation; and an electrode, formed at both of the substrates, for applying a voltage to the nematic liquid crystals. When a voltage is not applied, the orientation of the molecules of the nematic liquid crystals is maintained, so that the nematic liquid crystals act together as a 1/4 wavelength layer. Therefore, the nematic liquid crystals cooperate with the polarizing plate and the 1/4 wavelength plate in order to pass external light and produce a white display. On the other hand, when a voltage is applied, the orientation of the molecules of the nematic liquid crystals is changed to a substantially vertical orientation, so that the nematic liquid crystals lose their ability to act together as a 1/4 wavelength layer.

REFERENCES:
patent: Re35799 (1998-05-01), Sonehara et al.
patent: 6078370 (2000-06-01), Wang et al.

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