Optical structure and optical device
AssigneeGuangdong Oppo Mobile Telecommunications Corp., Ltd.
InventorChuhao Jiang
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Abstract
The present application discloses an optical structure. The optical structure includes a waveguide, and a first coupling-out grating, a second coupling-out grating, and a third coupling-out grating provided on the waveguide. The third coupling-out grating is located between the first coupling-out grating and the second coupling-out grating; the first coupling-out grating is a two-dimensional grating having a plurality of first grids, and the first grid is in an asymmetric shape, such that light efficiency of the first coupling-out grating propagating along a first direction is higher than light efficiency of the first coupling-out grating propagating along a second direction.
Claims20
An optical structure, comprising:
- a waveguide;
- a first coupling-out grating, arranged on the waveguide;
- a second coupling-out grating, arranged on the waveguide;
- and
- a third coupling-out grating, arranged on the waveguide, wherein the third coupling-out grating is located between the first coupling-out grating and the second coupling-out grating;
- wherein the first coupling-out grating is a two-dimensional grating with a plurality of first grids, the first grid has an asymmetric shape to allow light propagation efficiency of the first coupling-out grating along a first direction is higher than light propagation efficiency of the first coupling-out grating along a second direction;
- and
- wherein the first direction is a direction in which the first coupling-out grating faces the second coupling-out grating, and the first direction is opposite to the second direction.
An optical structure, comprising:
- a waveguide;
- a first coupling-out grating, arranged on the waveguide;
- a second coupling-out grating, arranged on the waveguide;
- a third coupling-out grating, arranged on the waveguide, wherein the third coupling-out grating is located between the first coupling-out grating and the second coupling-out grating;
- and
- a coupling-in grating, arranged at a same side of the first coupling-out grating, the second coupling-out grating and the third coupling-out grating, wherein the coupling-in grating and the third coupling-out grating are arranged side by side;
- wherein the third coupling-out grating comprises at least two sub-coupling-out gratings, a junction of two adjacent sub-coupling-out gratings is located within an eyebox of the optical structure, and diffraction efficiency of the sub-coupling-out grating away from the coupling-in grating is greater than diffraction efficiency of the sub-coupling-out grating close to the coupling-in grating.
An optical device, comprising:
- a projector, configured to provide augmented reality or virtual reality images;
- and
- a waveguide;
- a first coupling-out grating, arranged on the waveguide;
- a second coupling-out grating, arranged on the waveguide;
- and
- a third coupling-out grating, arranged on the waveguide, wherein the third coupling-out grating is located between the first coupling-out grating and the second coupling-out grating;
- wherein the first coupling-out grating is a two-dimensional grating with a plurality of first grids, the first grid has an asymmetric shape to allow light propagation efficiency of the first coupling-out grating along a first direction is higher than light propagation efficiency of the first coupling-out grating along a second direction;
- and
- wherein the first direction is a direction in which the first coupling-out grating faces the second coupling-out grating, and the first direction is opposite to the second direction.
Dependencies are inferred from the claim text.