Patent ID: 8696134
Filing Date: 2014-04-15
Classification: G02B

Abstract:
1. A depolarization element comprising: birefringence material layers including birefringence materials; and unit regions, each formed of m regions (m≧4) having different phase differences generated for incident linearly-polarized light, wherein: two regions, extracted from the m regions, has at least one combination of regions being different in area; a polarization state of the light that includes two or more light beams being different is changed; and when the area of the unit region is 1, i is an integer of 1 to m, the area of the i-th region is Ai, the phase difference generated for the light incident on the i-th region is δi, the angle between the polarization direction of the incident linearly-polarized light and the optical axis of the birefringence material is θ, the following expressions are satisfied