Multilayer diffraction optical waveguide device

Abstract

The invention discloses a multilayer diffraction optical waveguide device, which comprises a low-light level machine, a first waveguide assembly, a second waveguide assembly, a third waveguide assembly, a first grating assembly, a second grating assembly and a third grating assembly, and is characterized in that the low-light level machine is used for providing a first light ray, a second light ray and a third light ray which sequentially correspond to a blue light ray, a green light ray and a red light ray; the light rays are reflected through the corresponding rectangular prisms and coupled into the waveguides of the corresponding layers in a lossless mode for total reflection transmission, blue light rays, green light rays and red light rays are provided through the low-light level machine, and exit pupil expansion of the light rays is achieved through the corresponding grating assemblies and the light rays are coupled out to human eyes. The problem that in the prior art, loss of light provided by a low-light-level machine is large in the coupling-in or coupling-out process is solved, the overall image coupling-out efficiency and color uniformity are greatly improved, and high-quality image transmission under the colorful and large field angle is achieved.

Description

technical field [0001] The invention belongs to the field of optical waveguide devices, in particular to a multi-layer diffractive optical waveguide device. Background technique [0002] Diffractive optical waveguide devices generally include micro-optics, transparent or translucent single-layer waveguides or multilayer waveguide structures, coupling-in gratings, and exit pupil-expanding gratings. Among them, the micro-optical machine provides users with monochrome or color images under a certain field of view. Through coupling into the grating, under the condition of total reflection, it is coupled into the optical waveguide structure for total reflection transmission, and finally through The exit pupil expansion grating realizes two-dimensional exit pupil expansion and is coupled out of the optical waveguide, and finally enters the human eye, so that the user can observe the real world scene while observing the virtual image. In order to realize the transmission of color ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a multi-layer diffractive optical waveguide device for the low efficiency and uniformity of outcoupling images in the prior art

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