A method of manufacturing a display device, comprising: providing a wafer onto which a plurality of LEDs (420, 421, 421', 422, 422') and a plurality of alignment keys (AK, AK1, AK1', AK2, AK2') are disposed, wherein the plurality of LEDs (420, 421, 421', 422, 422') includes a plurality of first LEDs (421, 421') and a plurality of second LEDs (422, 422') which form a mosaic pattern, and wherein the plurality of alignment keys (AK, AK1, AK1', AK2, AK2') includes a plurality of first alignment keys (AK1, AK1') and a plurality of second alignment keys (AK2, AK2'); providing a first donor including a base layer, an adhering layer, and a plurality of bumps (133A, 134A, 135A), wherein the plurality of bumps (133A, 134A, 135A) includes a plurality of first bumps and a plurality of second bumps; providing a second donor including a base layer, an adhering layer, and a plurality of bumps (133B, 134B, 135B), wherein the plurality of bumps (133B, 134B, 135B) includes a plurality of first bumps and a plurality of second bumps; a first transferring step of transferring a plurality of the first LEDs (421, 421') onto the plurality of first bumps of the first donor, transferring a plurality of the first alignment keys (AK1, AK1') onto the plurality of seconds bumps of the first donor, transferring a plurality of the second LEDs (422, 422') onto the plurality of first bumps of the second donor, and transferring a plurality of the second alignment keys (AK2, AK2') onto the plurality of seconds bumps of the second donor, wherein the plurality of first LEDs (421, 421') disposed on the first donor form a mosaic pattern and the plurality of second LEDs (422, 422') disposed on the second donor form a mosaic pattern; and a second transferring step of transferring the plurality of first LEDs (421, 421') disposed on the first donor in a first area of a display panel and transferring the _plurality of second LEDs (422, 422') disposed on the second donor in a second area of the display panel, wherein the first area and the second area at least partially overlap, the plurality of first LEDs (421, 421') is disposed in the first area of the display panel to form a mosaic pattern, and the plurality of second LEDs (422, 422') is disposed in the second area of the display panel in the spaces between the plurality of first LEDs (421, 421')disposed in the first area. providing a wafer onto which a plurality of LEDs (420, 421, 421', 422, 422') and a plurality of alignment keys (AK, AK1, AK1', AK2, AK2') are disposed, wherein the plurality of LEDs (420, 421, 421', 422, 422') includes a plurality of first LEDs (421, 421') and a plurality of second LEDs (422, 422') which form a mosaic pattern, and wherein the plurality of alignment keys (AK, AK1, AK1', AK2, AK2') includes a plurality of first alignment keys (AK1, AK1') and a plurality of second alignment keys (AK2, AK2'); providing a first donor including a base layer, an adhering layer, and a plurality of bumps (133A, 134A, 135A), wherein the plurality of bumps (133A, 134A, 135A) includes a plurality of first bumps and a plurality of second bumps; providing a second donor including a base layer, an adhering layer, and a plurality of bumps (133B, 134B, 135B), wherein the plurality of bumps (133B, 134B, 135B) includes a plurality of first bumps and a plurality of second bumps; a first transferring step of transferring a plurality of the first LEDs (421, 421') onto the plurality of first bumps of the first donor, transferring a plurality of the first alignment keys (AK1, AK1') onto the plurality of seconds bumps of the first donor, transferring a plurality of the second LEDs (422, 422') onto the plurality of first bumps of the second donor, and transferring a plurality of the second alignment keys (AK2, AK2') onto the plurality of seconds bumps of the second donor, wherein the plurality of first LEDs (421, 421') disposed on the first donor form a mosaic pattern and the plurality of second LEDs (422, 422') disposed on the second donor form a mosaic pattern; and a second transferring step of transferring the plurality of first LEDs (421, 421') disposed on the first donor in a first area of a display panel and transferring the _plurality of second LEDs (422, 422') disposed on the second donor in a second area of the display panel, wherein the first area and the second area at least partially overlap, the plurality of first LEDs (421, 421') is disposed in the first area of the display panel to form a mosaic pattern, and the plurality of second LEDs (422, 422') is disposed in the second area of the display panel in the spaces between the plurality of first LEDs (421, 421')disposed in the first area.