Optical waveguide apparatus and display

A display for projecting an image light beam to a projection target, the display comprising:

• a projection apparatus, adapted to project an incident light, wherein the incident light is the image light beam;
• and
• an optical waveguide apparatus comprising:
• an optical waveguide element, comprising:
• a first surface;
• and
• a second surface opposite to the first surface, wherein an optical structure formed on the first surface or the second surface is a diffractive structure for generating a diffracted light beam, and the incident light enters the optical waveguide element via the first surface and is transmitted to the second surface;
• and
• an optical recycling element, disposed on the second surface of the optical waveguide element, wherein the incident light is transmitted to the optical recycling element via the second surface, the optical recycling element changes a transmission direction of the incident light to generate a recycled light, the recycled light passes through the diffractive structure to generate a refractive diffracted light by refractive diffraction, the refractive diffracted light enters the optical waveguide element via the second surface and is transmitted to the first surface, and the incident light and the refractive diffracted light are transmitted in the optical waveguide element, and then the incident light and the refractive diffracted light transmit into the projection target after leaving the optical waveguide element.