Polarizing plate and liquid crystal display using the same

Details Polarizing plate and liquid crystal display using the same Polarizing plate and liquid crystal display using the same

2005-01-25

2005-01-25

Chowdhury, Tarifur R. (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C349S122000

Reexamination Certificate

active

06847419

ABSTRACT:
A polarizing plate and a liquid crystal display using the same are disclosed. The polarizing plate includes a polarizer made of a synthetic resin and protective films. The same protective films are attached to both sides of the polarizer. When a FTIR-ATR method is carried out with respect to the both sides of the protective film and a peak intensity (A) in the wavelength range around 1488 cm−1of one side, a peak intensity (B) in the wavelength range around 1365 cm−1of one side, a peak intensity (A′) in the wavelength range around 1488 cm−1of another side and a peak intensity (B′) in the wavelength range around 1365 cm−1of another side are measured, and (C) and (C′) are represented by the relationships: (A)/(B)=(C) and (A′)/(B′)=(C′), (C)/(C′)≧1.2 is satisfied. The same sides of the protective films having the (C) and (C′) are adhered to both sides of the polarizer. In the polarizing plates, in accordance with the invention, even at the exposure to heat and humidity, advantageously occurrence of curling (warping) is reproduced.

REFERENCES:
patent: 4025688 (1977-05-01), Nagy et al.
patent: 5354513 (1994-10-01), Nakamura et al.
patent: 6147738 (2000-11-01), Okamoto
patent: 6512562 (2003-01-01), Kobayashi et al.

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