Light-emitting device and display apparatus including the same

A display apparatus comprising a plurality of pixels which emits light of different colors,

• wherein at least one of the plurality of pixels comprises:
• a metal reflective layer having a phase modulation surface on an upper surface thereof;
• a first electrode on the metal reflective layer;
• an organic emission layer provided on the first electrode and which emits white light;
• and
• a second electrode on the organic emission layer,
• wherein the phase modulation surface comprises a plurality of protrusions and a plurality of recesses,
• wherein the phase modulation surface is different from the upper surface, the upper surface of the metal reflective layer faces the first electrode, the plurality of protrusions protrudes from the upper surface, the plurality of recesses is recessed from the upper surface, and a height of the upper surface is lower than the plurality of protrusions and higher than the plurality of recesses,
• wherein an area occupied by each of the plurality of protrusions is greater than an area occupied by each of the plurality of recesses in a plan view,
• wherein in the plan view the plurality of protrusions and the plurality of recesses are arranged with a repeated pattern,
• the metal reflective layer includes a plurality of unit regions, which are adjacent to each other and have a same shape and a same area in the plan view,
• each of the unit regions includes a minimum unit of the repeated pattern, and
• a total area of the upper surface included in each of the unit regions is greater than a total area of the plurality of recesses included in each of the unit regions in the plan view.

A light-emitting device comprising:

• a metal reflective layer;
• a second electrode spaced apart from the metal reflective layer;
• a first electrode between the metal reflective layer and the second electrode;
• and
• an emission layer which emits a visible light and located between the first electrode and the second electrode, wherein the visible light comprises a light of a first wavelength and a light of a second wavelength,
• wherein the metal reflective layer comprises a surface facing the first electrode, a plurality of protrusions protruding from the surface, and a plurality of recesses recessed from the surface, and a height of the surface is lower than the plurality of protrusions and higher than the plurality of recesses,
• wherein an area occupied by each of the plurality of protrusions is greater than an area occupied by each of the plurality of recesses in a plan view,
• wherein in the plan view the plurality of protrusions and the plurality of recesses are arranged with a repeated pattern,
• the metal reflective layer includes a plurality of unit regions, which are adjacent to each other and have a same shape and a same area in the plan view,
• each of the unit regions includes a minimum unit of the repeated pattern, and
• a total area of the upper surface included in each of the unit regions is greater than a total area of the plurality of recesses included in each of the unit regions in the plan view.