| dc.description.abstract | In the augmented reality technology, waveguide is the main technology that is currently favored. In order to reduce the influence of the relative change between the system and the viewing position, the optical waveguide device is often used to copy the to-be-augmented image into two parts. Dimensional image group to increase the range of images that can be received by the pupil. This research mainly focuses on an exit pupil beam expansion technology applied to a waveguide augmented reality device suitable for narrow wavelength bands. We improve a uniform technology that can adjust the surface structure, so as to design and adjust the coupling and output of the waveguide element. The shape and relative configuration of the diffraction function microstructure at the position control the relative uniformity of each copied image, thereby realizing the purpose of copying the original image into a plurality of relatively uniform one-dimensional image arrays; in the coupling part, We mainly design the diffraction structure and the total reflection structure with beam splitting function, copy the image into three parallel images and transmit them respectively, and then through the coupling part corresponding to the designed structure array, the two-dimensional image can be coupled out. Relatively uniform image array. We used the diffraction structure design software, with a simple optimization concept and program, to successfully design the structure of the out-coupling structure array corresponding to the out-coupling parts of the specific wavelengths of green light, red light, and blue light, respectively. The simulation software results are as follows: Compared with the out-coupled one-dimensional image array, the uniformity of light center light output can reach about 99%, 96%, and 97%; the total light output efficiency can reach 64.2%, 52.9%, and 58.7%. In addition, the uniform technology of adjusting the surface structure is also considered to be applied to the adjustment technology of the original image unevenness. The results show that a Gaussian beam with a uniformity of 65.3% can be adjusted to a beam with a uniformity of about 82.3%. | en_US |