| dc.description.abstract | This studyis mainly to simulate and analyze the optical waveguide system, and the optical waveguide system has coupling-in and out-coupling structures, and the light can be coupled in and out of the optical waveguide through these two diffraction structures. We use RCWA and FDTD to simulate and analyze the scattering behavior of the diffraction structure and integrate them into a BSDF. In the optical waveguide system, this BSDF can be used to describe the propagation behavior of light after it hits the area surface established by BSDF, the light propagates later; and the structural parameters will be adjusted for the duty ratio and aspect ratio of the diffractive structure to find the best structural parameters. In order to increase the range of images that can be received by the pupil of the human eye, we have used 1D image exit pupil expansion and 2D image exit pupil expansion technology. In the part of 1D image exit pupil expansion technology, the in-coupling structure and out-coupling structure of the specific wavelengths of green light, red light and blue light have been successfully designed respectively. The results of simulation analysis are: the light output rate is 19.25%, 19.27% and 19.28% respectively, and the uniformity can reach 99.49%, 99.44% and 98.63%; The part of the 2D image exit pupil beam expansion technology is based on the 1D image exit pupil beam expansion technology. Before the light enters the optical waveguide system, the light is split by the combination of the beam splitter and the prism, so that the beam is divided into three beams. And it is guided and coupled out in the optical waveguide system by each coupling-in structure and out-coupling structure, the light output rate is 16.32%, 16.34% and 16.34% respectively, and the uniformity is 99.38%, 99.33% and 98.52% respectively. | en_US |