Display device, display module, electronic device, and method for fabricating display device

A display device comprising:

• a first light-emitting device;
• a second light-emitting device;
• a material layer;
• an insulating layer;
• a first sidewall insulating layer;
• a second sidewall insulating layer;
• a first color conversion layer;
• and
• a first coloring layer,
• wherein the first light-emitting device comprises a first pixel electrode over the insulating layer, a first layer over the first pixel electrode, and a common electrode over the first layer,
• wherein the second light-emitting device comprises a second pixel electrode over the insulating layer, a second layer over the second pixel electrode, and the common electrode over the second layer,
• wherein the first sidewall insulating layer is in contact with a side surface of the first pixel electrode,
• wherein the second sidewall insulating layer is in contact with a side surface of the second pixel electrode,
• wherein the material layer is in contact with a top surface of the insulating layer and positioned between the first sidewall insulating layer and the second sidewall insulating layer,
• wherein the first color conversion layer overlaps with the first light-emitting device,
• wherein the first coloring layer overlaps with the first light-emitting device with the first color conversion layer therebetween,
• wherein the first coloring layer transmits light with a longer wavelength than blue,
• wherein the first layer contains a first light-emitting material emitting blue light, and
• wherein the first layer, the second layer, and the material layer contain a same light-emitting material and are apart from each other.

A method for fabricating a display device, comprising:

• forming a conductive film over an insulating surface;
• processing the conductive film to form a first pixel electrode and a second pixel electrode;
• forming an insulating film covering the first pixel electrode and the second pixel electrode;
• processing the insulating film to form a first sidewall insulating layer in contact with a side surface of the first pixel electrode and a second sidewall insulating layer in contact with a side surface of the second pixel electrode and to expose a top surface of the first pixel electrode and a top surface of the second pixel electrode;
• forming a first layer in contact with the top surface of the first pixel electrode, the top surface of the second pixel electrode, and the insulating surface;
• forming a common electrode in contact with the first layer;
• providing a first color conversion layer overlapping with the first pixel electrode over the common electrode;
• and
• providing a first coloring layer overlapping with the first pixel electrode over the first color conversion layer,
• wherein the first layer contains a first light-emitting material emitting blue light.

A method for fabricating a display device, comprising:

• forming a conductive film over an insulating surface;
• processing the conductive film to form a first pixel electrode and a second pixel electrode;
• forming an insulating film covering the first pixel electrode and the second pixel electrode;
• processing the insulating film to form a first sidewall insulating layer in contact with a side surface of the first pixel electrode and a second sidewall insulating layer in contact with a side surface of the second pixel electrode and to expose a top surface of the first pixel electrode and a top surface of the second pixel electrode;
• forming a first layer in contact with the top surface of the first pixel electrode, a second layer in contact with the top surface of the second pixel electrode, and a material layer in contact with the insulating surface in a same step;
• forming a common electrode in contact with the first layer and the second layer;
• providing a first color conversion layer overlapping with the first pixel electrode over the common electrode;
• and
• providing a first coloring layer overlapping with the first pixel electrode over the first color conversion layer,
• wherein the first layer contains a first light-emitting material emitting blue light.