Patent ID: 8827456

Claim:
A projector, comprising: a first light source, providing a first beam in a first state; a second light source, providing a second beam in a second state; a splitting unit, receiving the first beam and the second beam, splitting the first beam into a first sub-beam and a second sub-beam, and splitting the second beam into a third sub-beam and a fourth sub-beam; a first modulating element, receiving the first sub-beam and the third sub-beam from the splitting unit; a second modulating element, receiving the second sub-beam and the fourth sub-beam from the splitting unit; a projection lens unit; a projection screen, comprising a rear cylinder lens array and a diffusing surface; and a combining unit, wherein when in the first state, the combining unit respectively receives the first sub-beam and the second sub-beam from the first modulating element and the second modulating unit, the first sub-beam and the second sub-beam travel from the combining unit, pass through a first and a second position of the projection lens unit, imaged by a cylinder lens of the rear cylinder lens array, and are projected to a first image position and second image position of the diffusing surface of the projection screen, and in the second state, the combining unit respectively receives the third sub-beam and the fourth sub-beam from the first modulating element and the second modulating unit, the third sub-beam and the fourth sub-beam travel from the combining unit, pass through a third and a fourth positions of the projection lens unit, imaged by another cylinder lens of the rear cylinder lens array, and are projected to a third image position and fourth image position of the diffusing surface of the projection screen, wherein the third image position is located between the first image position and the second image position, and the second image position is located between the third image position and the fourth image position.