Patent ID: 9176265
Filing Date: 2015-11-03
Classification: G02B

Abstract:
1. An image display device comprising: an image display element; an optical system; an optical waveguide having a light incident port along a first portion of the optical waveguide and a light outgoing port along a second portion of the optical waveguide, the optical waveguide configured to (a) receive light from the image display element through the light incident port via the optical system and (b) provide the light as output through the light outgoing port; a first diffraction grating positioned along the first portion of the optical waveguide; a second diffraction grating positioned along the second portion of the optical waveguide; a light shield configured to prevent leakage of the light through the first diffraction grating; and a transparent substrate having oppositely facing first and second surfaces, the first surface facing both the light incident port and the light outgoing port, the second surface facing the light shield, wherein,