Patent ID: 9213225
Filing Date: 2015-12-15
Classification: G02B,G03B,H04N

Abstract:
1. A polarization converter for use in a projector apparatus, the polarization converter comprising: a polarizing beam splitter for splitting a first light into a first light beam having a first polarized direction and a second light beam having a second polarized direction; a half wavelength retarder disposed on a side of the polarizing beam splitter for receiving the second light beam, the second light beam having the second polarized direction being converted into the second light beam having the first polarized direction by the half wavelength retarder, and the first light beam and the second light beam having the first polarized direction being coupled to form a first polarized light having the first polarized direction; and a quarter wavelength retarder disposed behind the half wavelength retarder for receiving the first polarized light and converting the first polarized light into a first circularly polarized light; wherein the polarizing beam splitter splits a second light into a third light beam having the second polarized direction and a fourth light beam having the first polarized direction, and the half wavelength retarder receives the fourth light beam, the fourth light beam having the first polarized direction is converted into the fourth light beam having the second polarized direction by the half wavelength retarder, and the third light beam and the fourth light beam having the second polarized direction are coupled to form a second polarized light having the second polarized direction, and the quarter wavelength retarder receives the second polarized light and converts the second polarized light into a second circularly polarized light.