Journal
MACROMOLECULAR SYMPOSIA
Volume 208, Issue -, Pages 323-333Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/masy.200450413
Keywords
cellulose triacetate (CTA); film; LCD; photographic film; polarizing plate; optical compensation; discotic liquid crystal; birefringence; retardation; hybrid alignment; TN; TFT; STN; polarized light
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The CTA film can be characterized by e.g. its relatively high moisture regain, significantly low birefringence, and moderate mechanical strength. Having been commercialized more than fifty years ago, it has been widely used as photographic film, protective film for polarizing plate, and optical compensation film for liquid crystal display (LCD). The photographic film application exploits the optical isotropy and unique physical properties of the CTA film. In the application of the CTA film to protective film for polarizing plate, its low in-plane birefringence is of particular importance. In the optical compensation to enhance the viewing angle of LCD, the CTA film, because of its moderate retardation in thickness direction (Rth), serves as an element of compensator as well as a base film. Considering the growth of the LCD market, the demand for CTA film is believed to be further expanding.
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