OPTICAL ELEMENT, ILLUMINATION APPARATUS, AND PROJECTION DISPLAY APPARATUS

摘要

An optical element includes a mirror surface configured to transmit certain part of incident light and to reflect the other part of the incident light. The mirror surface has a first region and a second region. The first region includes a first polarization conversion layer configured to convert a polarization direction of incident light incident on the first region from one linear polarization into a different linear polarization. A region of the optical element from which light transmitted through the first region is emitted includes a second polarization conversion layer configured to convert a polarization direction of the light transmitted through the first region from the different linear polarization into the one linear polarization.