Display device, display module, and fabrication method of display device

A display device comprising a first light-emitting element, a second light-emitting element, a first plug, and a second plug,

• wherein the first light-emitting element comprises a first lower electrode, a first reflective layer, a first insulating layer, a first conductive layer, a light-emitting layer, and an upper electrode,
• wherein the first lower electrode, the first reflective layer, the first insulating layer, the first conductive layer, the light-emitting layer, and the upper electrode are stacked in this order,
• wherein the second light-emitting element comprises a second lower electrode, a second reflective layer, a second insulating layer, a second conductive layer, the light-emitting layer, and the upper electrode,
• wherein the second lower electrode, the second reflective layer, the second insulating layer, the second conductive layer, the light-emitting layer, and the upper electrode are stacked in this order,
• wherein the first conductive layer, the first insulating layer, the second conductive layer, and the second insulating layer each have a light-transmitting property,
• wherein the second conductive layer is thicker than the first conductive layer,
• wherein the upper electrode has a transmitting property and a reflective property with respect to visible light,
• wherein the first lower electrode is electrically connected to the first conductive layer through the first plug,
• wherein the second lower electrode is electrically connected to the second conductive layer through the second plug,
• wherein the first plug is embedded in the first insulating layer, and
• wherein the second plug is embedded in the second insulating layer.

A method for manufacturing a display device, comprising:

• forming a first lower electrode and a second lower electrode apart from each other over a formation surface;
• forming a first reflective layer over the first lower electrode and a second reflective layer over the second lower electrode;
• forming a first insulating layer over the first reflective layer and a second insulating layer over the second reflective layer;
• forming a first conductive layer covering the first lower electrode and a second conductive layer covering the second lower electrode;
• and
• forming a light-emitting layer over the first conductive layer and the second conductive layer, and an upper electrode over the light-emitting layer,
• wherein the second conductive layer is formed to be thicker than the first conductive layer,
• wherein the first conductive layer and the second conductive layer are each formed to have a light-transmitting property,
• wherein the first lower electrode is electrically connected to the first conductive layer,
• wherein the second lower electrode is electrically connected to the second conductive layer, and
• wherein the upper electrode is formed to have a light-transmitting property and a reflective property.

A method for manufacturing a display device, comprising:

• forming a first conductive film to be a first lower electrode and a second lower electrode over a formation surface;
• forming a second conductive film to be a first reflective layer and a second reflective layer, covering the first conductive film;
• forming a first insulating film to be a first insulating layer and a second insulating layer over the first conductive film;
• embedding a first plug and a second plug in the first insulating film and electrically connecting each of the first plug and the second plug to the first conductive film;
• forming a first conductive layer over the first plug;
• forming a second conductive layer over the second plug;
• processing the first conductive film, the second conductive film, the first insulating film, the first conductive layer, the second conductive layer into island shapes, and forming the first lower electrode, the second lower electrode, the first reflective layer, the second reflective layer, the first insulating layer, and the second insulating layer;
• and
• forming a light-emitting layer over the first conductive layer and the second conductive layer, and an upper electrode over the light-emitting layer,
• wherein the second conductive layer is formed to be thicker than the first conductive layer,
• wherein the first conductive layer and the second conductive layer are each formed to have a light-transmitting property,
• wherein the first conductive layer is electrically connected to the first lower electrode through the first plug,
• wherein the second conductive layer is electrically connected to the second lower electrode via the second plug, and
• wherein the upper electrode is formed to have a light-transmitting property and a reflective property.