Display device

Abstract

A display device with both high display quality and high resolution is provided. The display device includes a light-emitting element and a connection portion. The connection portion is provided along an outer periphery of a display region where the light-emitting element is provided. The light-emitting element includes a pixel electrode, a first EL layer over the pixel electrode, a second EL layer over the first EL layer, and a common electrode over the second EL layer. The connection portion includes a connection electrode, a second EL layer over the connection electrode, and the common electrode over the second EL layer. The second EL layer includes a first region in contact with the connection electrode and a second region in contact with the common electrode. The area of a region where the first region and the second region overlap with each other in a top view is greater than or equal to 40000 square micrometers. The second EL layer includes a region where the film thickness is greater than or equal to 0.5 nm and less than or equal to 1.5 nm. The second EL layer contains a substance with a high electron-injection property.

Dependencies are inferred from the claim text.