Liquid crystal display device and multilayer phase plate

Details Liquid crystal display device and multilayer phase plate Liquid crystal display device and multilayer phase plate

2007-11-13

2007-11-13

Nguyen, Dung T. (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C349S118000

Reexamination Certificate

active

10824832

ABSTRACT:
A twisted nematic liquid crystal display device conducts a display operation in Normally Black mode. The liquid crystal display device includes a liquid crystal cell and two polarizers. The liquid crystal cell includes two substrates and a liquid crystal layer sandwiched between them. The two polarizers face each other with the liquid crystal cell interposed between them. The liquid crystal display device further includes: a first optical compensator provided between one of the two polarizers and the liquid crystal cell so as to compensate for the wavelength dependence of the angle of rotation of polarized light passing through the liquid crystal layer in a black display state; and a second optical compensator provided between the first optical compensator and that polarizer so as to compensate for the wavelength dependence of the ellipticity of the polarized light passing through the liquid crystal layer in the black display state.

REFERENCES:
patent: 6717645 (2004-04-01), Shimoshikiryou et al.
patent: 6747720 (2004-06-01), Saiki et al.
patent: 2001-188232 (2001-07-01), None
Sergan, et al., “Achromatic Normally Black Twisted Nematic Device with Wide Viewing Angle Using Negative-in-plane Compensation Films”, Jpn. J. Appl. Phys. vol. 37 (1998) pp. 889-894, Part 1, No. 3A, Mar. 1998.
Kumagawa, et al., “P2-9 Black and White STN-LCD Using Two Birefringent Films”, Japan Display, 1989, pp. 312-315.

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