Light-emitting device and display apparatus

A display apparatus, comprising:

• a light-emitting device configured to output light, wherein the light-emitting device includes:
• a substrate;
• a first end as a light-outgoing end;
• a second end opposite to the first end;
• a stripe-shaped first electrode layer that extends from the second end to the first end;
• a first conduction type layer including:
• a current injection region, wherein the stripe-shaped first electrode layer corresponds to the current injection region on the first conduction type layer;
• and
• a current non-injection region;
• a second conduction type layer on the substrate;
• an active layer between the first conduction type layer and the second conduction type layer;
• a second electrode layer in contact with one of the substrate or the second conduction type layer;
• a waveguide structure in the first conduction type layer, the active layer, and the second conduction type layer, wherein the waveguide structure includes:
• a first region that includes:
• a first waveguide that corresponds to the current injection region, wherein the stripe-shaped first electrode layer is on a top surface of the first waveguide and a plurality of wall surfaces of the first waveguide;
• and
• a plurality of first recesses as the current non-injection region, wherein a first refractive index difference of the first region is a difference between a refractive index of the current injection region and a refractive index of the current non-injection region;
• and
• a second region between the first region and the first end, wherein the second region includes:
• a second waveguide that extends from the first waveguide to the first end;
• a plurality of second recesses, wherein
• the second waveguide is between the plurality of second recesses,
• a second refractive index difference of the second region is a difference between a refractive index of the second waveguide and a refractive index of the plurality of second recesses,
• the second refractive index difference is greater than the first refractive index difference, and
• the second waveguide includes a specific region that narrows toward the first end;
• and
• a dielectric layer in contact with a surface of each recess of the plurality of first recesses and each recess of the plurality of second recesses, wherein
• the dielectric layer is on the plurality of wall surfaces of the first waveguide, and
• the stripe-shaped first electrode layer on the plurality of wall surfaces of the first waveguide is in contact with the dielectric layer on the plurality of wall surfaces of the first waveguide;
• and
• an image generation unit configured to:
• two-dimensionally scan the light output from the light-emitting device;
• and
• control brightness of a projection of the light based on image data and the two-dimensional scan of the light output from the light-emitting device.