A display device includes a substrate and a wire grid polarizer disposed on the substrate. The wire grid polarizer includes a first wire grid layer, a first middle layer, and a second wire grid layer. The first wire grid layer includes a plurality of first wire grid lines separated from each other. The first middle layer is disposed on the first wire grid layer. The first middle layer includes a first portion having a first middle layer thickness and a second portion having a second middle layer thickness thinner than the first middle layer thickness. The second middle layer thickness is thinner than a thickness of each first wire grid line. The second wire grid layer is disposed on the first middle layer and includes a plurality of second wire grid lines separated from each other. The second wire grid lines overlap the second portion of the first middle layer.