Patent ID: 8867133

Claim:
A polarization converting device comprising: a polarization separation unit aligned with a plurality of unit blocks including an optical separator between an upper surface and a lower surface of the unit blocks transmitting a first polarization and reflecting a second polarization; a phase retarder aligned in correspondence to the upper surface of each unit block of the polarization separation unit where a first region and a second region are alternately formed; and an optical alignment film interposed between the polarization separation unit and the phase retarder; wherein the optical alignment film is alternately formed with a first area having a vertical or horizontal angle relative to an optical polarization direction responsive to a predetermined interval, and a second area having an alignment angle 45 degrees relative to the optical polarization direction, wherein the first area is formed with a transmissive region by irradiating ultraviolet (UV) on the optical alignment film, and the second area is formed with a non-transmissive region by irradiating UV on the first area aligned along a mask pattern, wherein any one of the first and second regions of the phase retarder converts the polarized light while the other region emits the polarized light as it is, and wherein the first region and the second region of the phase retarder are formed with a cured reactive liquid crystal which is coated on the optical alignment film and has an optical axis responsive to an alignment direction of the optical alignment film, wherein each thickness of the first region and the second region of the phase retarder is 20˜50 μm.