Granted Patent B2

US 12,598,864 · App. 18/270,773 · Granted Apr 7, 2026

Inventors: Shunpei Yamazaki (Setagaya, JP); Nobuharu Ohsawa (Zama, JP); Kenichi Okazaki (Atsugi, JP)

Assignee: Semiconductor Energy Laboratory Co., Ltd.

H10K59/1201H10K50/166H10K59/771H10K59/35H10K59/873

Abstract

Claims (67)

1 . A display device comprising:

a first light-emitting device; and

a second light-emitting device,

wherein the first light-emitting device comprises:

a first pixel electrode;

a first hole-injection layer over the first pixel electrode;

a first hole-transport layer over the first hole-injection layer;

a first light-emitting layer over the first hole-transport layer;

a first electron-transport layer over the first light-emitting layer;

a second electron-transport layer over the first electron-transport layer;

an electron-injection layer over the second electron-transport layer; and

a common electrode over the electron-injection layer,

wherein the second light-emitting device comprises:

a second pixel electrode;

a second hole-injection layer over the second pixel electrode;

a second hole-transport layer over the second hole-injection layer;

a second light-emitting layer over the second hole-transport layer;

a third electron-transport layer over the second light-emitting layer;

the second electron-transport layer over the third electron-transport layer;

the electron-injection layer over the second electron-transport layer; and

the common electrode over the electron-injection layer,

wherein the first light-emitting device and the second light-emitting device are configured to emit light of different colors from each other, and

wherein the second electron-transport layer covers at least a side surface of the first pixel electrode, a side surface of the second pixel electrode, a side surface of the first light-emitting layer, and a side surface of the second light-emitting layer.

2 . The display device according to claim 1 , further comprising:

a protective layer over the common electrode.

3 . The display device according to claim 1 ,

wherein the first light-emitting device and the second light-emitting device are provided over an insulating layer,

wherein the insulating layer includes a recessed portion, and

wherein the second electron-transport layer is in contact with the recessed portion.

4 . The display device according to claim 1 ,

wherein a space is included between the second electron-transport layer and the electron-injection layer.

5 . The display device according to claim 1 ,

wherein an insulator is included between the second electron-transport layer and the electron-injection layer.

6 . A display module comprising:

the display device according to claim 1 ; and

at least one of a connector and an integrated circuit.

7 . An electronic device comprising:

the display module according to claim 6 ; and

at least one of a housing, a battery, a camera, a speaker, and a microphone.

8 . A method for manufacturing a display device, comprising:

forming an insulating layer;

forming a conductive film over the insulating layer;

forming a first hole-injection layer over the conductive film;

forming a first hole-transport layer over the first hole-injection layer;

forming a first light-emitting layer over the first hole-transport layer;

forming a first electron-transport layer over the first light-emitting layer;

forming a first sacrificial layer over the first electron-transport layer;

processing the first hole-injection layer, the first hole-transport layer, the first light-emitting layer, the first electron-transport layer, and the first sacrificial layer to expose part of the conductive film;

forming a second hole-injection layer over the first sacrificial layer and the conductive film;

forming a second hole-transport layer over the second hole-injection layer;

forming a second light-emitting layer over the second hole-transport layer;

forming a second electron-transport layer over the second light-emitting layer;

forming a second sacrificial layer over the second electron-transport layer;

processing the second hole-injection layer, the second hole-transport layer, the second light-emitting layer, the second electron-transport layer, and the second sacrificial layer to expose part of the conductive film;

processing the conductive film with the first sacrificial layer and the second sacrificial layer used as a hard mask to form a first pixel electrode overlapping with the first sacrificial layer and a second pixel electrode overlapping with the second sacrificial layer;

removing the first sacrificial layer and the second sacrificial layer;

forming a third electron-transport layer over the first electron-transport layer and the second electron-transport layer;

forming an electron-injection layer over the third electron-transport layer; and

forming a common electrode over the electron-injection layer.

9 . The method for manufacturing a display device, according to claim 8 , further comprising:

forming a protective layer over the common electrode.

10 . The method for manufacturing a display device, according to claim 8 ,

wherein the third electron-transport layer is provided so as to cover at least a side surface of the first pixel electrode, a side surface of the second pixel electrode, a side surface of the first light-emitting layer, and a side surface of the second light-emitting layer.

11 . The method for manufacturing a display device, according to claim 8 ,

wherein a recessed portion of the third electron-transport layer is filled with an insulating material before the formation of the electron-injection layer.

12 . The method for manufacturing a display device, according to claim 8 ,

wherein in the step of processing the conductive film, a recessed portion is formed in the insulating layer.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (59)