Patent ID: 7632714

Claim:
A method for manufacturing a display device, comprising the steps of: forming a bottom electrode for supplying a first charge, in individual pixels on a substrate; forming a hole injection layer over the bottom electrode; forming a hole transport layer over the hole injection layer; forming a pattern of a first light-emitting layer having a first-charge transport property above the bottom electrode in part of the pixels; subjecting the substrate having the first light-emitting layer formed thereon to heat treatment, so as to planarize exposed surfaces of the first light-emitting layer and of the hole transport layer, the top surface of the first light-emitting layer serving as an emission region; forming a pattern of a second light-emitting layer having a second-charge transport property on the heat-treated surface above the bottom electrode in another part of the pixels, a lower surface of the second light-emitting layer, which serves as an emission region, is planarized due to being formed on the planarized exposed surface of the hole transport layer; and forming a top electrode for supplying a second charge so that the first light-emitting layer and the second light-emitting layer are sandwiched between the bottom electrode and the top electrode.