Polarizing plate and display using the same
a technology of polarizing plates and displays, applied in the direction of instruments, optical elements, transportation and packaging, etc., can solve the problems of not fully achieving the effect of reducing the variation of retardation values of polarizing plates due to changes in production conditions, and not fully satisfying the improvement, so as to achieve uniform display quality and reduce the variation of retardation values
Inactive Publication Date: 2006-06-01
KONICA MINOLTA OPTO
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Benefits of technology
"The present invention provides a polarizing plate with a retardation film that has reduced variation in retardation values due to changes in production conditions. This results in a display that shows uniform display quality. The polarizing plate includes a polarizing film with a retardation film containing a plasticizer and cellulose ester. The retardation film has a free volume radius determined by positron annihilation lifetime spectroscopy that is within a certain range."
Problems solved by technology
However, these improvements have not been fully satisfactory.
However, variations of retardation values of polarizing plates due to changes in producing conditions have not been fully reduced so far.
Specifically, in an amorphous-like cellulose ester, for example, a mixed acid ester of cellulose such as cellulose acetate propionate, a notable effect has not been fully obtained.
Method used
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[0294] The present invention will now be specifically explained using examples, however, the present invention is not limited thereto.
[0295] The following material were loaded in turn and sealed in a container and the temperature was raised from 20° C. to 80° C. The loaded materials were stirred in the container at 80° C. for three hours, whereby the cellulose ester was completely dissolved. Then, stirring was stopped and the temperature was lowered to 43° C. Obtained solution was filtered using Filter Paper No. 244 produced by Azumi Filter Paper Co., Ltd to obtain Dope A.
[0296] (Preparation of Dope A)
Cellulose ester (cellulose acetate propionate; the100 weight parts acetylation degree of 1.9, propionyl substitutiondegree of substitution 0.8)Trimethylolpropane tribenzoate 5 weight partsEthylphthalylethyl glycolate 5 weight partsSilica particles (Aerosil R972V produced by Nippon0.1 weight parts Aerosil Co., Ltd.)Methylene chloride300 weight parts Ethanol40 weight parts
(Preparati...
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Abstract
A polarizing plate comprising a polarizing film having thereon a retardation film containing a plasticizer and a cellulose ester, wherein a free volume radius of the retardation film determined by positron annihilation lifetime spectroscopy is in the range of 0.250-0.310 nm.
Description
[0001] This application is based on Japanese Patent Application No. 2004-345733 filed on Nov. 30, 2004 in Japanese Patent Office, the entire content of which is hereby incorporated by reference. FIELD OF THE INVENTION [0002] The present invention relates to a polarizing plate and a display using the same, and specifically, relates to a polarizing plate having small variation in retardation values due to change in production conditions, and to a display using the same. BACKGROUND OF THE INVENTION [0003] A large sized liquid crystal display (LCD) has recently attracted attention. With respect to large-sized LCDs, required therein is higher performance, for example, in viewing angle, contrast and stability in quality against environmental changes, compared to the required performance for conventional personal notebook computers or LCD monitors. Therefore, higher performance is also required for the polarizing plates used for the large sized LCD device or for the cellulose ester film us...
Claims
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IPC IPC(8): C09K19/00
CPCY10T428/1036G02B5/3083C09K2323/03C08B3/06G02F1/13363
Inventor SHIMIZU, KAZUYUKISHIBUE, TOSHIAKIMURAKAMI, TAKASHI
Owner KONICA MINOLTA OPTO