Liquid crystal display device, liquid crystal display device, and method for designing liquid crystal display device

摘要

Provided is a liquid crystal display element capable of improving the scratch resistance on the back surface of the liquid crystal display element, making interference fringes invisible, and suppressing luminance unevenness. According to one aspect of the present invention, the first polarizing plate 40, the second polarizing plate 50, the liquid crystal cell 60 disposed between the first polarizing plate 40 and the second polarizing plate 50, A first optical film 41 having a first concavo-convex surface 41 A that forms a surface 30 A of the liquid crystal display element 30, and the first optical film 41. A second optical film 51 including a first polarizer 42 disposed on the liquid crystal cell 60 side, and a second polarizing plate 50 having a second uneven surface 51A forming the back surface 30B of the liquid crystal display element 30; The second polarizer 52 disposed on the liquid crystal cell 60 side of the second optical film 51, the first uneven surface 41A and the second uneven surface 51A have the same shape, and the first uneven surface The unevenness constituting 41A and the unevenness constituting the second uneven surface 51A The first concavo-convex surface 51A has an average inclination angle of θa [°], the average interval between the local peaks of the second concavo-convex surface 51A is S [μm], and the second concavo-convex surface 51A. The following formula (1) is satisfied, where N is the refractive index of the concavo-convex structure and the average distance between the first concavo-convex surface 41A and the second concavo-convex surface 51A is D [μm]. A liquid crystal display element 30 is provided. D ≦ S / (2 × tan (θa−sin−1 ((sin θa) / N))) (1)