Multidirectional diffraction extension optical waveguide lens and augmented reality display device

Abstract

The invention provides a multidirectional diffraction extension optical waveguide lens and an augmented reality display device. The multidirectional diffraction extension optical waveguide lens comprises a waveguide; and a functional area which is located on the upper surface or the lower surface of the waveguide, has an optical diffraction function, and at least comprises an incident functional area in which a coupling-in diffraction structure which couples the external image light to the waveguide and realizes the multidirectional diffraction expansion of the image light is arranged, wherein the coupling-in diffraction structure is composed of a plurality of groups of array structures; and an emergent functional area in which a coupling-out diffraction structure used for coupling the image light transmitted from the waveguide out of the waveguide and realizing the multidirectional expansion of the image light is arranged, wherein the coupling-out diffraction structure is composed of a plurality of groups of array structures. According to the invention, the multidirectional diffraction expansion of the image light can be realized, so that an imaging visual angle is increased.

Description

technical field [0001] The invention relates to virtual reality display technology, in particular to a multi-directional diffraction extended optical waveguide lens and an augmented reality display device. Background technique [0002] Augmented reality (AR) technology is a new technology that "seamlessly" integrates real world information and virtual world information. It not only shows real world information, but also displays virtual information at the same time. The two kinds of information complement each other. overlay. [0003] The prior art US20160231568 discloses a grating waveguide structure using in-coupling-inflection-outcoupling. Image light enters from the in-coupling area, expands and bends through the inflection area, and finally expands and outputs through the out-coupling area. This solution using three separate areas requires a large-area waveguide, which is not suitable for micro-display systems (such as AR glasses). In addition, the parameters such as g...

AI Technical Summary

Problems solved by technology

Another problem is that this way of diffractive extension in one direction requires a large number of diffractive interactions (each resulting in a scattering loss), resulting in a large reduction in image light energy

Images