Patent ID: 7580085
Filing Date: 2009-08-25
Classification: G02B,H04N

Abstract:
1. An optical device comprising an input polarizer ( 4 ) for passing light having a first polarization direction ( 11 ), a polarization modifying element ( 5 ) for receiving light of the first polarization direction from the input polarizer ( 4 ), and an output polarizer ( 7 ) for analysing light from the polarization modifying element ( 5 ), the polarization modifying element ( 5 ) comprising polarization directions of at least first and second sets of regions ( 8 , 9 ) asymmetric with respect to the first polarization direction, each region ( 8 ) of the first set changing the polarization of light from the input polarizer ( 4 ) to a second polarization direction different from the first polarization direction and each region ( 9 ) of the second set supplying light of a third polarization direction different from the second polarization direction to output a non-uniform wavefront, wherein the output polarizer ( the output polarizer ( the polarization modifying element (