| 摘要 |
PURPOSE:To obtain a large-sized substrate having good uniformity of display by using a simultaneously biaxially stretched plastic film of same draw ratio. CONSTITUTION:The plastic film produced by subjecting said film to biaxial stretching simultaneously at approximately 1 vertical and horizontal draw ratios is used for the plastic film of a voltage impression type liquid crystal display element formed by sandwiching a liquid crystal material between a pair of the transparent conductive plastic films. The film formed by such method has the double refractive index in the transverse direction as shown by (a) of the figure, and permits drawing of the part having <=5X10<-4> double refractive index wider than (b) in the case of the film formed by an ordinary successive biaxial stretching method. The optically excellent liquid crystal display element is thus obtd. if the part having <=5X10<-4> double refractive index is drawn from the roll film in the longitudinal direction thereof and the liquid crystal display element is manufacture of such part. |
