Optical waveguide and near-to-eye display system

Abstract

The embodiment of the invention relates to the technical field of optics, and in particular relates to an optical waveguide and a near-to-eye display system. The optical waveguide provided by the embodiment of the invention comprises a waveguide substrate, a coupling-in region, a coupling-out region and a light return region; the coupling-in region, the coupling-out region and the light return region are arranged on the waveguide substrate; the coupling-in region is used for coupling in a light beam with image information; the coupling-out region is used for coupling out the light beam with the image information; the light return region is used for reversely returning the light beam with the image information to the coupling-out region; the coupling-out region comprises at least three sideedges; at least one side edge of the coupling-out region is provided with the light return region; when an image light beam is propagated to the edge of the coupling-out region, part of the image light beam can be reversely propagated back to the coupling-out region due to the action of the light return region and then is coupled out to human eyes through the coupling-out region, and therefore the energy utilization rate of the two-dimensional expansion diffraction optical waveguide is increased.

Description

technical field [0001] The embodiments of the present invention relate to the field of optical technology, and in particular to an optical waveguide and a near-eye display system. Background technique [0002] Currently, in AR (Augmented Reality, augmented reality technology) devices, the relief grating waveguide technology has received extensive attention. Due to the convenience of nanoimprinting, and the advantages of large field of view and large eye movement range compared with other waveguide solutions, the relief grating waveguide scheme has been widely studied. [0003] The existing embossed grating waveguide schemes mainly include waveguide schemes based on one-dimensional gratings and waveguide schemes based on two-dimensional gratings. The grating, the image light beam emitted by the image light source is coupled into the optical waveguide substrate through the coupling grating, and propagates in the optical waveguide substrate in a way of total reflection. users...

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Problems solved by technology

However, when the image beam propagates to the edge of the outcoupling grating area, because there is no outcoupling grating, part of the image beam is not completely outcoupled, and the energy utilization rate is not good, so it is very urgent to improve the energy utilization rate of the two-dimensional extended diffractive optical waveguide.

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