Display device

A display device, comprising:

• a light-emitting-element layer on a substrate, and comprising an anode electrode, a cathode electrode, a first sub-pixel comprising a first emission structure, a second sub-pixel comprising a second emission structure, and a third sub-pixel comprising a third emission structure;
• and
• a lens-array layer on the light-emitting-element layer, and comprising lenses comprising a first lens provided to overlap the first emission structure in a plan view, a second lens provided to overlap the second emission structure in a plan view, and a third lens provided to overlap the third emission structure in a plan view,
• wherein each of the lenses comprises a lower lens part and an upper lens part on the lower lens part,
• wherein the lower lens part has a trapezoidal cross-section, and
• wherein the upper lens part has a semi-circular cross-section.

A display device, comprising:

• a light-emitting-element layer on a substrate, and comprising an anode electrode, a cathode electrode, a first sub-pixel comprising a first emission structure, a second sub-pixel comprising a second emission structure, and a third sub-pixel comprising a third emission structure;
• and
• a lens-array layer on the light-emitting-element layer, and comprising lenses comprising a first lens provided to overlap the first emission structure in a plan view, a second lens provided to overlap the second emission structure in a plan view, and a third lens provided to overlap the third emission structure in a plan view,
• wherein the display device comprises the first sub-pixel, the second sub-pixel, and the third sub-pixel without including a color filter, and
• wherein the cathode electrode comprises a same material in each of the first emission structure, the second emission structure, and the third emission structure, and has a thickness in a range from 70 Å to 140 Å.