US Patent 10082719 Liquid crystal lens and 3D display

The disclosure provides a liquid crystal lens, including an upper substrate, a lower substrate, a liquid crystal layer and a spacer, the liquid crystal layer and the spacer are disposed between the upper substrate and the lower substrate. A surface of the spacer is coated with a first antireflection film and a second antireflection film in turn. An index of refraction of the liquid crystal layer is n0. An index of refraction of the first antireflection film is n2, a thickness of which is d2. An index of refraction of the second antireflection film is n1, a thickness of the second antireflection film is d1. An index of refraction of the spacer is n3, and