Augmented reality display device

Abstract

An augmented reality display device (), comprising: a light engine () for emitting image light; and at least one layer of optical waveguide lens () comprising an in-coupling grating region (), an optical waveguide substrate () and a turning and out-coupling grating region (), wherein the in-coupling grating region () is disposed on a first optical surface of the optical waveguide substrate (); the optical waveguide substrate () is configured to transmit the image light through total reflection; the turning and out-coupling grating region () is disposed on the first optical surface of the optical waveguide substrate () for receiving totally reflected light and coupling it out; and a sum of the in-coupling grating vector and the turning and out-coupling grating vectors is not zero, wherein the in-coupling angles of the light engine () and the respective layers of optical waveguide lenses () are identical. As a result, the light engine () and the optical waveguide lenses (), even in the case of non-perpendicular in-coupling, can ensure that the central field of view of the light engine () coincides with the central field of view of human eyes, greatly improving the degree of freedom of the structural design of the light engine () and the optical waveguide lenses (), so that the structure of the augmented reality display device () is diversified, and the display device is manufactured as having a smaller size.