Design method of diffractive optical element and partitioned dodging illumination system

Abstract

The invention provides a design method of a diffractive optical element. The design method comprises the steps of S101, determining parameters of a light source and a target light field of the diffractive optical element; S102, determining the distribution of a plurality of first microstructure units on the diffractive optical element according to the parameters of the light source; S103, dividing the target light field into a plurality of target maps, wherein the target maps are superposed to form the target light field, and each first microstructure unit corresponds to one of the target maps; S104, carrying out distortion pre-correction on the plurality of target maps respectively; and S105, according to the plurality of corrected target maps and the parameters of the light source, respectively designing phase distribution of the plurality of corresponding first microstructure units. According to the embodiment of the invention, the VCSEL partitioned light source is combined with the diffractive optical element, so that a clear and distortionless large-field-angle uniform light field can be projected; and the diffractive optical element is applied to a partitioned dodging illumination system, and technical guarantee is provided for dodging illumination required by a DTOF system.

Description

technical field [0001] The present invention generally relates to the technical field of laser display, and in particular to a design method of a diffractive optical element, a diffractive optical element, and a partitioned uniform lighting system. Background technique [0002] At present, the existing TOF (Time-Of-Flight) scheme in the mobile phone industry is Indirect Time-Of-Flight (IndirectTime-Of-Flight), which uses indirect schemes, such as the phase change of the emitted light field and the received light field, to calculate the distance of the target object. Compared with time-of-flight ranging with direct time stamps, the error of indirect measurement is larger. For example, when testing multiple targets, it will be converted into an average value to calculate a distance, and the environmental noise of indirect measurement has a great impact. These problems can be solved by directly using time stamps for time-of-flight ranging. Sensors designed for Direct Time-Of-F...

AI Technical Summary

Problems solved by technology

However, when DOE works on projecting a target light field with a large viewing angle, pincushion distortion occurs in the target light field area with a large field of view, and the larger the field of view, the more serious the pincushion distortion, which affects the Reconstruction of 3D information

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