Projector

A projector comprising:

• a light source module emitting unpolarized light which comprises first S-polarized light and first P-polarized light;
• a polarization conversion system receiving the unpolarized light, wherein the first S-polarized light passes through the polarization conversion system, a part of the first P-polarized light is converted into second S-polarized light after passing through the polarization conversion system, and another part of the first P-polarized light remains unchanged after passing through the polarization conversion system;
• a reflective polarizer allowing the first S-polarized light and the second S-polarized light to pass through and reflecting the first P-polarized light back to the polarization conversion system;
• a liquid crystal panal adding image information to the first S-polarized light and the second S-polarized light to obtain a projection light;
• and
• a projection lens projecting the projection light.