manufacturing method of a diffuser for making the holographic optical element for 3 dimensional display device and manufacturing method of holographic optical element adopting the same

摘要

PURPOSE: A method of fabricating a diffuser for manufacturing an HOE(Holographic Optical Element) of a 3-dimensional display device is provided to replace an existing diffuser with a holographic diffuser by repeatedly using normal holographic principles, thereby enabling a uniform diffraction on entire areas of a final HOE. CONSTITUTION: The first reference beam is irradiated in an inclined direction for the first photoplate formed with the first photosensitive film. A diffusion beam is entirely irradiated on the photosensitive film of the first photoplate, to form a latent image by diffraction and interference of the first reference beam and the diffusion beam on the photosensitive film. The first photosensitive film formed with the latent image is developed. The second reference beam is incident on the second photoplate formed with the second photosensitive film for diffuser processing. The first conjugated reference beam is incident on the first photoplate. A beam transmitted through the first photoplate is incident on a photosensitive film of the second photoplate, to form a latent image by diffraction and interference of the first conjugated reference beam and the second reference beam. The second photosensitive film of the second photoplate is developed to manufacture a holographic diffuser having a diffraction grating.