Waveguide assembly, optical device and intelligent glasses

An optical device, comprising:

• a waveguide assembly, comprising:
• a first waveguide layer;
• a second waveguide layer stacked with the first waveguide layer;
• and
• a first spacing layer arranged between the first waveguide layer and the second waveguide layer, wherein the first spacing layer comprises a first region and a second region, a refractive index of the first region is less than that of the first waveguide layer and that of the second waveguide laver, and a refractive index of the second region is less than that of the first region;
• in response to light rays are transmitted from a side of the second waveguide layer towards the first region to the first waveguide layer, the first region is configured to reduce a transverse transmission period of the light rays, the second region is configured to allow a first light ray of a first viewing angle in the light rays to be fully reflected, so that the first waveguide layer is configured to independently transmit the first light ray;
• and the second region is configured to allow a second light ray of a second viewing angle in the light rays to pass through the second region, so that the first waveguide layer and the second waveguide layer are configured to jointly transmit the second light ray;
• an in-coupling grating disposed on a side of the first waveguide layer away from the second waveguide layer, wherein the in-coupling grating corresponds to the first region;
• and
• a first out-coupling grating disposed on the side of the first waveguide layer away from the second waveguide layer, wherein the first out-coupling grating corresponds to the second region;
• in response to the light rays are transmitted from the side of the second waveguide layer towards the first region to the first waveguide layer, the light ray is coupled into the waveguide assembly through the in-coupling grating, and the first light ray and the second light ray are coupled out by the first out-coupling grating.

Smart glasses, comprising:

• a frame;
• and
• an optical device installed on the frame, wherein the optical device comprises:
• a waveguide assembly comprising a first waveguide layer, a second waveguide layer stacked with the first waveguide layer, and a first spacing layer arranged between the first waveguide layer and the second waveguide layer, wherein the first spacing layer comprises a first region and a second region, a refractive index of the first region is less than that of the first waveguide layer and that of the second waveguide layer, and a refractive index of the second region is less than that of the first region;
• in response to light rays are transmitted from a side of the second waveguide layer towards the first region to the first waveguide layer, the first region is configured to reduce a transverse transmission period of the light rays, the second region is configured to allow a first light ray of a first viewing angle in the light rays to be fully reflected, so that the first waveguide layer is configured to independently transmit the first light ray;
• and the second region is configured to allow a second light ray of a second viewing angle in the light rays to pass through the second region;
• so that the first waveguide layer and the second waveguide layer are configured to jointly transmit the second light ray;
• an in-coupling grating disposed on a side of the first waveguide layer away from the second waveguide layer, wherein the in-coupling grating corresponds to the first region;
• and
• a first out-coupling grating disposed on the side of the first waveguide layer away from the second waveguide layer, wherein the first out-coupling grating corresponds to the second region;
• in response to the light rays are transmitted from the side of the second waveguide layer towards the first region to the first waveguide layer, the light ray is coupled into the waveguide assembly through the in-coupling grating, and the first light ray and the second light ray are coupled out by the first out-coupling grating.