Diffractive optical waveguide, display device and diffractive optical waveguide design method

Abstract

The invention discloses a diffractive optical waveguide for optical pupil expansion, a display device comprising the diffractive optical waveguide and a diffractive optical waveguide design method. The diffractive optical waveguide comprises a waveguide substrate, and a coupling-in grating and a coupling-out grating which are arranged on or in the substrate, wherein the decoupling grating is at least partially formed on a random partition area, the random partition area comprises a plurality of partitions, the decoupling grating comprises a plurality of sub-gratings formed in the plurality of partitions, and the sub-gratings in at least part of the partitions have different optical structures. According to the diffractive optical waveguide and the design method thereof in the embodiment of the invention, partitions coupled out of the grating are randomly formed in a certain area, different grating optical structures are adopted in different partitions, and the final waveguide effect is used as evaluation for optimization design; compared with other diffractive optical waveguides and regular partition and / or fixed grating structures in design methods thereof, the diffractive optical waveguide has a higher design freedom degree, and the optimization result of the diffractive optical waveguide can be closer to an optimal solution.

Description

technical field [0001] The invention relates to a display technology based on diffraction, in particular to a diffractive optical waveguide that can be used for augmented reality display, a display device including the diffractive optical waveguide, and a design method for the diffractive optical waveguide. Background technique [0002] With the high development of semiconductor technology, the way of interaction between human and computer is developing rapidly. Among them, augmented reality (Augmented Reality, AR) display can provide human beings with more dimensional information, and has attracted widespread attention. AR glasses are one of the important mediums in the field of augmented reality display. The existing AR glasses based on geometric optics use a free-form surface solution, which has size limitations; the design principle of AR glasses based on arrayed optical waveguides is relatively simple, but the process is difficult and is not suitable for mass production...

AI Technical Summary

Problems solved by technology

The diffractive optical waveguide used for AR display, especially the two-dimensional grating waveguide, because the grating has multi-order diffraction and the grating is sensitive to polarization, the entire waveguide coupling system has high irregularity. If the grating area is not partitioned and optimized , then within the range of the final eyebox, the light intensity received by the human eye at different positions is different, which will make it difficult for the display module using diffractive optical waveguide as AR glasses to be accepted by human senses

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