Design of optical engine for LCOS laser display with rotated diffuser plate

Based on the theoretical analysis of the generation of laser speckles, a specific scheme is proposed to reduce composite speckles in the tricolor liquid‐crystal‐on‐silicon laser projector.The rotated diffuser is relatively simple in its optical structure which can be easily implemented. Furthermore, the experiment with regard to the detected images at the receiver is also performed to verify the feasibility of our method. It is shown by simulated results that the rotated diffuser plate can effectively suppress the contrast ratio of laser speckles.