Patent ID: 11668928

Abstract:
Provided is a design method for a diffractive optical element for being used for projecting an oblique line. The method comprises: determining an angle θ between an oblique line and a first direction (S101); according to the angle, determining a first cycle d1 of a diffractive optical element in the first direction and a second cycle d2 of the diffractive optical element in a second direction, wherein the first direction is perpendicular to the second direction, and the first cycle d1 and the second cycle d2 satisfy tgθ=d1/d2 (S102); and obtaining a phase distribution map of the diffractive optical element according to the first cycle d1, the second cycle d2 and a target pattern with an oblique line at 45° (S103). By means of the design method, the visual effect of an optical field projected by means of a diffractive optical element can be improved.