Optical filter, display device including the optical filter, and electronic device including the same

An electronic device comprising a display device,

• wherein the display device comprises:
• a light source that outputs light;
• a spatial light modulator that modulates phase or amplitude of light output from the light source;
• and
• an optical filter that filters light provided from the spatial light modulator,
• wherein the optical filter comprises:
• a substrate;
• a first layer on one side of the substrate;
• a second layer on the first layer;
• and
• a third layer on the second layer,
• wherein the first layer, the second layer, and the third layer comprise materials different from one another,
• wherein a height of the first layer, a height of the second layer, and a height of the third layer are different from one another, and
• wherein the third layer comprises a plurality of structures that extend in a first direction and that are provided in a second direction perpendicular to the first direction.

An optical filter comprising:

• a substrate;
• a first layer on one side of the substrate;
• a second layer on the first layer;
• and
• a third layer on the second layer,
• wherein the first layer, the second layer, and the third layer comprise materials different from one another,
• wherein a height of the first layer, a height of the second layer, and a height of the third layer are different from one another, and
• wherein the third layer comprises a plurality of structures that extend in a first direction and that are provided in a second direction perpendicular to the first direction.