申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:EP0678567A1
公开(公告)日:1995-10-25
A retardation film comprising a polymerized liquid crystal oligomer having positive intrinsic birefringence, also having a glass transition temperature of 50°C or below and showing nematic or smectic phase, characterized in that the optical axis of the film lies in the film plane, that the value of retardation (product of anisotropy of refractive index Δn of said film and film thickness d) at 30°C is 100 nm or above, and that the ratio of the value of retardation at 80°C to that at 30°C is 0.95-0.5, allows proper adjustment of the rate of change with temperature in accordance with the rate of change with temperature of the liquid crystal cell used in combination with the film, and can provide liquid crystal display devices showing excellent display performance at high temperatures.
一种由具有正本征双折射率的聚合液晶低聚物组成的延迟膜,其玻璃化转变温度为 50℃或以下,并显示向列相或共晶相,其特征在于该薄膜的光轴位于薄膜平面上,在 30℃时的延迟值(所述薄膜的折射率各向异性Δn 与薄膜厚度 d 的乘积)为 100 nm 或以上,且在 80℃时的延迟值与在 30℃时的延迟值之比为 0.95-0.5,可根据与薄膜结合使用的液晶电池的温度变化率适当调整随温度的变化率,并可提供在高温下显示性能优异的液晶显示设备。