Abstract: A display device includes a substrate having a first surface in which a light-emitting element is disposed, a second surface, and a first lateral side; a connecting electrode disposed on the first surface; a first insulating layer disposed on the connecting electrode and including a contact hole; a first upper pad electrode electrically connected to the connecting electrode, the first upper pad electrode having a first thickness in an area not overlapping the contact hole and having a second thickness in an area overlapping the contact hole; a second upper pad electrode disposed on the first upper pad electrode and having a substantially flat profile; a lower pad disposed on the second surface of the substrate; and a side wiring electrically connecting the second upper pad electrode and the lower pad, the side wiring surrounding the first surface, the first lateral side, and the second surface of the substrate.

Abstract: The display device includes: a substrate; a thin-film transistor disposed on the substrate; a passivation layer covering the thin-film transistor; a capping layer disposed on the passivation layer; and a pixel electrode disposed on the capping layer and connected to the thin-film transistor, wherein a thickness of the capping layer is determined according to: d1=(?/2)×(1/2n), where d1 denotes the thickness of the capping layer, ? denotes a wavelength within visible wavelength range, and n denotes a ratio of refractive indices of the passivation layer to the capping layer.

Abstract: The display device includes: a substrate; a thin-film transistor disposed on the substrate; a passivation layer covering the thin-film transistor; a capping layer disposed on the passivation layer; and a pixel electrode disposed on the capping layer and connected to the thin-film transistor, wherein a thickness of the capping layer is determined according to: d1=(?/2)×(1/2n), where d1 denotes the thickness of the capping layer, ? denotes a wavelength within visible wavelength range, and n denotes a ratio of refractive indices of the passivation layer to the capping layer.