Display device

A display device comprising:

• a first substrate;
• a plurality of light-emitting elements on the first substrate;
• a second substrate opposite to the first substrate, and comprising one face facing the first substrate, and an opposite face to the one face;
• a plurality of grooves at the opposite face of the second substrate;
• a plurality of wavelength conversion layers, each of the wavelength conversion layers being located in a corresponding groove of the plurality of grooves to convert a wavelength of light emitted from a corresponding light-emitting element of the plurality of light-emitting elements;
• and
• a plurality of color filters on the wavelength conversion layers, respectively,
• wherein a protrusion is on a bottom face of each of the plurality of grooves, the protrusion protruding toward the plurality of color filters,
• wherein the plurality of grooves penetrate the opposite face of the second substrate and do not penetrate the one face of the second substrate, and
• wherein a same material of the second substrate that is located between the plurality of light-emitting elements and the plurality of grooves is also located between the plurality of grooves to space the grooves from each other.

A display device comprising:

• a first substrate;
• a plurality of light-emitting elements on the first substrate;
• a second substrate opposite to the first substrate, and comprising one face facing the first substrate, and an opposite face to the one face;
• a plurality of grooves at the opposite face of the second substrate;
• a planarization layer received in each of the plurality of grooves;
• a plurality of wavelength conversion layers on the planarization layer and received in the plurality of grooves, respectively, wherein each of the wavelength conversion layers is configured to convert a wavelength of light emitted from a corresponding light-emitting element of the plurality of light-emitting elements;
• and
• a plurality of color filters on the wavelength conversion layers, respectively,
• wherein each of the plurality of grooves has a bottom face and a side face,
• wherein a fine convex-concave pattern is on at least the side face of each of the grooves,
• wherein the plurality of grooves penetrate the opposite face of the second substrate and do not penetrate the one face of the second substrate, and
• wherein a same material of the second substrate that is located between the plurality of light-emitting elements and the plurality of grooves is also located between the plurality of grooves to space the grooves from each other.