Hexagonal columnar structure for diffracted optical waveguides

Abstract

The invention discloses a hexagonal columnar structure for a diffracted optical waveguide. The hexagonal columnar structure comprises a micro-projection light machine used for emitting image light, awaveguide substrate used for forming a diffraction grating, a coupling-in grating used for receiving and conducting the image light emitted by the micro-projection light machine, and a coupling-out grating. The coupling-in grating is arranged at the light inlet of the waveguide substrate, the coupling-out grating is arranged at the light outlet of the waveguide substrate, and the coupling-out grating is provided with a plurality of regular hexagonal prisms for diffracting image light; the adjacent spacing distances of the regular hexagonal prism subareas are gradually reduced and are distributed in an axial symmetry manner. The coupling-out grating has the beneficial effects that through the designed multiple partition regular hexagonal prisms, the multiple partition regular hexagonal prisms are arranged in the 60-degree included angle array, and the problems that the efficiency of the whole diffraction waveguide of the diffraction grating is low and uneven, and the effect of a projection image seen by a user is not good enough are well solved.

Description

technical field [0001] The invention relates to the technical field of display devices, in particular to a hexagonal columnar structure used for a diffractive optical waveguide. Background technique [0002] With the development of virtual reality and augmented reality technologies, near-eye display devices have developed rapidly, such as Google Glass of Google and Hololens of Microsoft. The near-eye display of augmented reality is a technology that images light fields in real space, and can take into account both virtual and real operations. Coupling image light into the human eye using traditional optical waveguide components has been used, including the use of prisms, mirrors, transflective waveguides, holograms, and diffraction gratings. The optical waveguide display system uses the principle of total reflection to realize light wave transmission, combined with diffraction elements to realize directional transmission of light, and then guides the image light to the huma...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a hexagonal columnar structure for a diffractive optical waveguide to solve the problem that the efficiency of the entire diffractive waveguide of the existing diffraction grating is low and uneven, and the projected image effect seen by the user is not good.

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