Patent ID: 9341855
Filing Date: 2016-05-17
CPC Classification: G02B

Claim Text:
1. A polarization converter, comprising: a patterned polarization grating comprising multiple domains of a first type and multiple domains of a second type; wherein each of the multiple domains of the first type is configured to diffract incident non-polarized light into left hand circular polarized beams at a first angle relative to the patterned polarization grating and right hand circular polarized beams at a second angle relative to the patterned polarization grating, and each of the multiple domains of the second type is configured to diffract incident non-polarized light into left hand circular polarized beams at the second angle relative to the patterned polarization grating and right hand circular polarized beams at the first angle relative to the patterned polarization grating; wherein left hand circular polarized beams from a first domain of the patterned polarization grating converge with left hand circular polarized beams from a second domain of the patterned polarization grating adjacent to the first domain at a distance away from the patterned polarization grating; wherein right hand circular polarized beams from the second domain of the patterned polarization grating converge with right hand circular polarized beams from a third domain of the patterned polarization grating adjacent to the second domain at the distance away from the patterned polarization grating; and wherein the polarization converter further comprises: a patterned retarder, comprising retarder domains of a first type corresponding to left hand circular polarized beams and retarder domains of a second type corresponding to right hand circular polarized beams, wherein the patterned retarder is positioned at the distance away from the patterned polarization grating.