Liquid crystal cells – elements and systems – With specified nonchemical characteristic of liquid crystal... – Within nematic phase
Reexamination Certificate
2011-03-01
2011-03-01
Robinson, Mark A (Department: 2883)
Liquid crystal cells, elements and systems
With specified nonchemical characteristic of liquid crystal...
Within nematic phase
C438S030000
Reexamination Certificate
active
07898638
ABSTRACT:
Disclosed herein is a liquid-crystal display device capable of reducing leakage of light under a black state due to scattering from a liquid-crystal layer, and having high-contrast ratio, excellent image quality performance. The liquid-crystal display device comprises: a liquid-crystal panel including one pair of polarizers disposed on one pair of substrates, a liquid-crystal layer held in sandwiched form between the pair of substrates, and a group of electrodes formed on at least one of the pair of substrates for applying an electric field to the liquid-crystal layer; and a light source unit disposed outside the pair of substrates. The liquid-crystal layer includes a liquid-crystal material having an ordinary-light refractive index of at least 1.46, but up to 1.49, an extraordinary-light refractive index of at least 1.54, but up to 1.59, and a mean photoelastic constant of at least 8, but up to 25, and exhibiting a nematic phase.
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Yoneya et al., “Depolarized light scattering from liquid crystals as a factor for black level light leakage in liquid-crystal displays”, Journal of Applied Physics 98, 016106 (Jul. 2005).
Yuka et al., “P.27: Analysis of Light-Leakage Caused by Colour Filters for Improving Contrast Ratio of LCD TV's”, Eurodisplay' 05, p. 27.
Hiyama Ikuo
Kagawa Hiroyuki
Kajita Daisuke
Ono Kikuo
Takeda Shintaro
Antonelli, Terry Stout & Kraus, LLP.
Chiem Erin D
Hitachi Displays Ltd.
Robinson Mark A
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