Display device

A display device includes a circuit board including a first circuit portion, a second circuit portion, and a third circuit portion, a first display panel on the first circuit portion, and configured to emit a first light, a second display panel on the second circuit portion, and configured to emit a second light, a third display panel on the third circuit portion, and configured to emit a third light, and an optical combiner configured to combine the first light, the second light, and the third light to output a light.