| 摘要 |
An optical film 10 has columnar structures which is composed of at least two phases 11, 12 different in refractive index, and in which one phase 12 of larger refractive index extends in the thickness direction of the film, being characterized in that the columnar structures are inclined at an angle of 25 degrees or more to less than 90 degrees to the normal direction of the film. This optical film has a characteristic of elevating in the straight light transmissivity as the incident angle of the light increases in the negative direction from the vertical direction L1 to L2 and L3, and on the other hand, lowering in the straight light transmissivity when the incident angle changes from L1 to L4 direction. Therefore, when the optical film is used in a liquid crystal display device or the like, it is possible to display an image excellent in visibility and luminance when observed in the front direction. <IMAGE>
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