In order to improve the imaging quality of the existing projector and simplify the optical path structure of theprojection system, this paper involves a new type of optical system of projection system, using three-color LD lightsource as illumination source of projection system, using tapered light guide tube as the light guide. This articlestudies the principle of diffusers to suppress speckles, and derives the influence of diffuser number, divergenceangle and gap between diffuser on speckle contrast. Using the Tracepro to build a three-dimensional model. Theoptical path structure was simulated and the results of simulation were analyzed. It shows that the speckle contrastof the projection system is 5% and the spot uniformity is up to 95.8%. Compared with the traditional laserprojection light path, reduce the color wheel、Color-combination prism、dichroic mirror、mirrors and othercomponents, simplifies the light path structure.
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