Polarizer for visible light
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United States of America Patent
Stats
-
Feb 11, 1992
Grant Date -
N/A
app pub date -
Feb 13, 1990
filing date -
Jul 12, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention concerns a polarizer for visible light, comprising a polyvinyl alcohol-based polarizing element wherein not less than 60% of dichromophore is iodine, and a protective film. The said polarizing element has at least three absorption bands in an ultraviolet region of 210 nm to 400 nm and also has a UA value of not smaller than 4.0 which value represents ultraviolet absorption characteristics. Consequently, the polarizer of the invention possesses both superior polarization characteristics and high heat and humidity resistance. The polarizer of the invention having these characteristics is used for liquid crystal display and is suitable particularly for such uses as display in watches and electronic calculators, terminal dispaly in personal computers and word processor, picture display in portable television sets, and display in automobiles and aircraft.
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