Analysis and suppression of stray light in micro mirror array waveguide

Micro mirror array waveguide technology is a kind of transmission display technology based on the principle of reflection of light, which has the ability of color display with large pupil, and has a wide application prospect in the field of AR display. In order to ensure the transmittance of the exterior light, the reflectivity of the micro mirror array cannot be very high, so the micro mirror array waveguide system is a low optical efficiency system. In this case, the stray light is very sensitive to the influence of the system, so the suppression of stray light inside and outside the system is an important part of the design of micro mirror array waveguide system. In this paper, a typical micro mirror array waveguide is taken as the analysis object, and the optical path of internal stray light and external stray light is analyzed respectively, and the simulation is carried out by using TracePro software. According to the simulation results of stray light optical path, the methods to suppress all kinds of stray light are proposed, which can eliminate most of the stray light, and provide a reference for the design optimization of micro mirror array waveguide.