Transfer device for light-emitting element, display device including light-emitting element, electronic device including display device and method using transfer device

A method for transferring a light-emitting element comprising:

• disposing a transfer device on a substrate, the transfer device comprising:
• a first transfer head;
• a second transfer head disposed below the first transfer head;
• a stamp disposed below the second transfer head;
• a tilting adjustment member for adjusting the tilting of the second transfer head;
• and
• an air supply member for forming an air layer by spraying air downward from a surface of the second transfer head;
• lowering the transfer device by forming the air layer between the second transfer head and the substrate by the air supply member-wherein a thickness of the air layer is thicker than a sum of a height of the stamp and a height of the light-emitting element;
• the adjusting a flatness of the transfer device to a flatness of the substrate;
• and
• the lowering the second transfer head downward to pressurize the air layer to contact and transfer the light-emitting element to the substrate-wherein the thickness of the air layer is equal to the sum of the height of the stamp and the height of the light-emitting element.