| abstract |
(57) Abstract: A filter which is simple to manufacture and easy to install, and which can expand the viewing angle of a liquid crystal display screen more than ever, and a liquid crystal display device having the viewing angle and having a large viewing angle. To do. SOLUTION: Two kinds of layers having different refractive indexes are formed in a state of being alternately folded, and the difference in the refractive indexes of the two kinds of layers is 0.01 to 0.1. Has an average thickness of 0.8 μm or more and less than 2 μm, and a film thickness of 10 An optical filter made of a polymer film having a thickness of 300 μm, And a liquid crystal display comprising a light source device, a back polarizing plate, a liquid crystal cell, and a front polarizing plate, wherein the optical filter is mounted between the liquid crystal cell and the front polarizing plate or in front of the front polarizing plate. . |