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Browsing by Author "Chang, LM"

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    The generation of biaxial optical anisotropies in polyimide films by an uniaxial stretch method
    (2006-05-01)
    King, JS
    ;
    Whang, WT
    ;
    Lee, WC
    ;
    Chang, LM
    ;
    材料科學與工程學系
    A new biaxial-retardation film prepared from the uniaxial-stretched polyimide (PI) film was developed for compensating the viewing angle of liquid-crystal displays. A new aliphatic PI showing high transparence and low glass-transition temperature was firstly prepared for the biaxial-retardation film purpose. Both retardations in x-y and x-z planes of PI films were highly increased after stretching them uniaxially at 260 degrees C. Good uniformity of birefringence in well-stretched PI films was observed visually with two crossed polarizers. The birefringence variations of nx-ny (difference of refractive indexes between x- and y-axes) and nx-nZ during the stretching process were highly affected by PI structure.