Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2006-03-28
2006-03-28
Schechter, Andrew (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S075000, C349S076000
Reexamination Certificate
active
07019804
ABSTRACT:
A liquid crystal display device has a liquid crystal cell, a liquid crystalline substance layer, a pair of polarizers, and an optical compensation element. The twist angle of the liquid crystal cell is set to 180 to 270 degrees. The optical compensation element has a twisted structure twisted in the opposite direction to that of the liquid crystal cell. The difference in the absolute values of the twist angles between the liquid crystal cell and the optical compensation element is from 40 to 100 degrees. The difference in retardation at a wavelength λ=550 nm between the liquid crystal cell and the optical compensation element is from 100 to 250 nm. When the absolute values of the differences in retardation at wavelengths λ of 400 nm and 550 nm between the liquid crystal cell and the optical compensation element are represented by ΔR(400) and ΔR(550), respectively, and the ratio D therebetween is represented by D=ΔR(400)/ΔR(550), D is within the range of 0.5 to 1.0.
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Kumagai Yoshihiro
Masaki Akira
Uesaka Tetsuya
Adams & Wilks
Caley Michael H.
Nippon Oil Corporation
Schechter Andrew
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