Semiconductor light emitting device and display apparatus

A semiconductor light emitting device, comprising:

• a light emitting structure in a form of a rod, the light emitting structure including:
• a first conductivity-type semiconductor layer, the first conductivity-type semiconductor layer defining a first surface of the light emitting structure,
• an active layer,
• a second conductivity-type semiconductor layer, the second conductivity-type semiconductor layer defining a second surface of the light emitting structure opposite the first surface, and a side surface of the light emitting structure connecting the first and second surfaces;
• a regrowth semiconductor layer surrounding an entirety of the side surface of the light emitting structure, the regrowth semiconductor layer having an external side surface formed of crystallographic planes, wherein the regrowth semiconductor layer comprises an undoped layer;
• a first electrode on the first surface of the light emitting structure and connected to the first conductivity-type semiconductor layer;
• and
• a second electrode on the second surface of the light emitting structure and connected to the second conductivity-type semiconductor layer,
• wherein the side surface of the light emitting structure and the external side surface of the regrowth semiconductor layer have different shapes in a cross-section perpendicular to the side surface and the external side surface,
• wherein the regrowth semiconductor layer contacts a side surface of the first conductivity-type semiconductor layer, a side surface of the active layer, and a side surface of the second conductivity-type semiconductor layer.