Retardation film, producing process thereof and liquid...

Details Retardation film, producing process thereof and liquid... Retardation film, producing process thereof and liquid...

2008-01-15

2008-01-15

Wu, Shean C (Department: 1756)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

C252S299010, C349S117000, C349S121000

Reexamination Certificate

active

07318951

ABSTRACT:
A novel retardation film is disclosed. The film comprises a transparent substrate and an optically anisotropic layer formed thereon by fixing a liquid crystalline compound in an aligned state, wherein the retardation film, when positioned between two polarizers in a crossed Nicol arrangement, has a frontal luminance within a range of 0.700 to 0.000 cd/m2. A novel liquid crystal display is also disclosed. The display comprises a first polarizing film, the retardation film positioned in contact with a surface of the first polarizing film, a first substrate, a liquid crystal layer formed of a liquid crystal material, and a second substrate positioned in this order, in which liquid crystal molecules of the liquid crystal material are aligned in a black state parallel to surfaces of a pair of the substrates. In the display, a slow axis of the retardation film is parallel to a transmission axis of the first polarizing film and also to a slow axis of the liquid crystal molecules of the liquid crystal layer in a black state.

REFERENCES:
patent: 5853801 (1998-12-01), Suga et al.
patent: 6346974 (2002-02-01), Itou et al.
patent: 7019130 (2006-03-01), Ito
patent: 2004/0001175 (2004-01-01), Ito
patent: 8-94835 (1996-04-01), None

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