Optimized design of double-plate full-color holographic waveguide display

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.