Optical waveguide and near-eye display device

An optical waveguide, comprising:

• a first lens, a second lens, and a connecting portion that connects the first lens and the second lens;
• an in-coupling grating, located on the connecting portion and configured to couple incident light to the optical waveguide, wherein after the incident light is diffracted by the in-coupling grating, first diffractive light transmitted in the first lens and second diffractive light transmitted in the second lens are formed;
• a first out-coupling grating, located on the first lens and configured to couple the first diffractive light out of the first lens;
• a second out-coupling grating, located on the second lens and configured to couple the second diffractive light out of the second lens;
• a first turn grating, located on the first lens;
• and
• a second turn grating, located on the second lens,
• wherein
• a shape of an outermost edge of a projection of the first turn grating is a first right triangle with a first hypotenuse facing the first out-coupling grating;
• and
• a shape of an outermost edge of a projection of the second turn grating is a second right triangle with a second hypotenuse facing the second out-coupling grating.