Patent ID: 9645477
Date: 2017-05-09
CPC Classifications: G02B,G03B

Claim:
1. A polarization light emitting diode (LED) module comprising: a casing comprising an opening; a light source configured to emit light; a reflective polarizer configured to transmit first polarized light of the light emitted from the light source through the opening of the casing toward an external polarization converter, and configured to reflect second polarized light of the light emitted from the light source toward the light source; a reflector configured to reflect light, which is reflected from the reflective polarizer and traveling toward the light source, toward the reflective polarizer; and a wavelength plate provided between the reflective polarizer and the reflector and configured to convert the second polarized light into the first polarized light when the second polarized light reflected from the reflective polarizer repetitively passes through the wavelength plate, wherein the light source, the reflective polarizer, the reflector, and the wavelength plate are provided inside the casing.