Patent ID: 6246455
Filing Date: 2001-06-12
Classification: G02F

Abstract:
A display device comprising:a polarization-changing element which changes a polarization axis;a first polarized-light separator provided on one side of said polarization-changing element and an optical device provided on another side of said polarization-changing element with said polarization-changing element between; anda light source which illuminates between said first polarized-light separator and said optical device;said first polarized-light separator transmitting transmits plane-polarized light of a given first direction incident from said polarization-changing element, towards an opposite side of said first polarized light separator from said polarization-changing element reflecting plane-polarized light of a given second direction perpendicular to said given first direction towards said polarization-changing element, and for light incident on the opposite side of said first polarized-light separator from said polarization-changing element, emitting said plane-polarized light of said given first direction towards said polarization-changing element; andsaid optical device separating light, which is incident on said polarization-changing element, into plane-polarized light of a given third direction and plane-polarized light of a given fourth direction perpendicular to said given third direction, and emitting at least one of said plane-polarized light of said given third direction and said plane-polarized light of said given fourth direction towards said polarization-changing element.