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.
Full-color holographic waveguide display usually adopts a single-plate display structure, and although the structure is simple and light, the field of view is small. As to this problem, a full-color holographic waveguide display with double-layer grating and double-plate structure is proposed. This configuration consists of four gratings to realize the light input and output, and expension of the exit pupil.To display the RGB color with a better uniformity in the wider field of view, with the Rigorous Coupled-wave Analysis(RCWA), the shape of grating and grating films are designed and optimized.
In order to decrease the complexity to design and manufacture the turning grating of the configuration with one reflecting surface, an L-shape two-dimension extended configuration with single plate is given in the paper. This configuration consists of one specular reflecting surface and three holographic gratings two in which periods and the groove orientations are totally same, which makes gratings design and fabrication easier. According to the calculation and analysis to the optical path of configuration, the dimension of the turning grating is no larger than 40mm×30mm. The simulation result demonstrates the display configuration is reasonable and correct and can realize the display effect with 30°×30° field of view and Φ30mm large exit pupil. This configuration can be applied to an Augmented Reality Display (AR) or a Head-Mounted Display (HMD).
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