Flexible variable-angle array diffractive optical element for laser speckle suppression

Abstract

A flexible variable-angle array diffractive optical element for laser speckle suppression is made on a flexible material, and is composed of N groups of one-dimensional binary diffractive optical structures connected end to end. The one-dimensional binary diffractive optical structures include grating structures and optical microstructures. One-dimensional refers to that each diffractive optical structure is a one-dimensional pattern, and binary refers to that the optical path difference formed by the depth of the diffractive optical structures is binary. The invention provides a flexible variable-angle array diffractive optical element for laser speckle suppression which has the advantages of good full-band speckle suppression effect, simple mode of motion, easy implementation, good system versatility and robustness, and low cost. The flexible variable-angle array diffractive optical element is made of a flexible material. Through a variable-angle array diffractive structure, infiniteuniform cyclic crawler-type transmission is constructed to replace reciprocating mechanical movement in order to achieve red-green-blue full-band laser speckle suppression.

Description

technical field [0001] The invention belongs to the field of laser display projection, in particular to a diffractive optical device for laser speckle suppression. Background technique [0002] Laser projection display system is getting more and more attention and welcome because of its rich colors, high picture quality, long life, high reliability, high efficiency, low energy consumption and other advantages. However, since laser light is highly coherent light, a picture noise called laser speckle will inevitably be generated. Speckle appears as black spots randomly distributed in the laser spot, and its essence is the random coherent superposition of signals. The existence of speckle seriously affects the quality of images and information. In the field of laser projection display, speckle will degrade the image quality of projection display, cause viewers to experience symptoms such as fatigue and dizziness, seriously affect the experience of laser projector users, and be...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the prior art that the speckle suppression effect is not good enough, full-band speckle suppression cannot be performed, the number and types of devices used in the system are large, the moving parts are complex and have impact damage to the instrument, the size is large, the structure of the instrument is complex, and the energy consumption is high. , the present invention provides a flexible variable-angle array diffractive optical device for laser speckle suppression with good full-band speckle suppression effect, simple movement mode, easy implementation, system versatility, good robustness, and low cost. Made of flexible materials, through variable-angle array diffraction structures, a crawler-type transmission that can circulate infinitely at a constant speed instead of reciprocating mechanical movement realizes red, green, and blue full-band laser speckle suppression

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