5.4 Properties and applications of cellulose triacetate film |
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Authors: | Hiroaki Sata Masahiko Murayama Shu Shimamoto |
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Institution: | 1. Flat Panel Display Materials Research Laboratory, Ashigara Research Laboratories, Fuji Photo Film Co. Ltd., 210 Nakanuma, Minamiashigara, Kanagawa 250-0193 Japan;2. Cellulose R & D Center, Daicel Chemical Industries, Ltd., 1239 Shinzaike, Aboshi-ku, Himeji, Hyogo 671-1283 Japan |
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Abstract: | 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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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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