Patent ID: 8894212

Claim:
A projector optical system, the system comprising: an illumination unit including illumination lenses illuminating light downwards; a display device receiving light illuminated from the plurality of illumination lenses to enable the display device to realize an image; a plurality of projection lenses downwardly projecting light emitted from the display device to a screen; and a first field lens arranged between the illumination unit and the display device for changing a first optical angle of the light illuminated from the plurality of illumination lenses and emitting the light to the display device, and a second field lens arranged between the display device and the plurality of projection lenses for changing a second optical angle by receiving an image light of the display device and emitting the image light to the plurality of projection lenses; wherein the plurality of illumination lenses and the plurality of projection lenses are on a same optical axis, and wherein the display device is a reflective display device.