Fly-eye lens and optical engine for projector including same

An optical engine for a projector, comprising:

• a first light source unit;
• a second light source unit configured to output light beams with a color different from that of the first light source unit;
• a third light source unit configured to output light beams with a color different from those of the first light source unit and the second light source unit;
• a micro display panel configured to output a predetermined image;
• a fly-eye lens including a plurality of cells, each of which includes a convex lens, and configured to equalize light beams;
• a projection lens configured to project a generated projection image to the outside based on the output light beams from the first to third light source units and the output image;
• a first mirror configured to change the traveling direction of light beams from the first light source unit and to transmit light beams from the second light source unit and the third light source unit;
• a second mirror configured to change the traveling direction of light beams from the second light source unit and to transmit light beams from the third light source unit;
• a common lens disposed between the first mirror and the second mirror;
• relay lenses configured to collimate light beams having passed through the fly-eye lens, and a total internal reflection prism configured to output light beams to the projection lens;
• wherein, among the cells, two or more cells have shapes different from shapes of other cells.