IP Library › Granted Patent US 12701887
Granted Patent B2
US 12701887 · App. 18/571,534 · Granted Aug 4, 2026

Display device and method of manufacturing display device

Inventors: Yuto Tsukamoto (Kameyama City, JP); Shinichi Kawato (Kameyama City, JP); Tokiyoshi Umeda (Kameyama City, JP); Tohru Sonoda (Kameyama City, JP)
Assignee: Sharp Display Technology Corporation
H10K59/353H10K39/34H10K59/1201
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Quick Facts
Patent No.
US 12701887
App. No.
18/571,534
Granted
Aug 4, 2026
Kind
B2
Abstract

A display device has a display area including a first pixel region, a second pixel region, and a third pixel region. The display device includes: a first electrode; a first photoelectric conversion layer including a first light-emitting layer, a second light-emitting layer, and a third light-emitting layer; a first electric charge injection layer; a second electric charge injection layer; a second photoelectric conversion layer including a fourth light-emitting layer; and a second electrode. The first light-emitting layer is provided in the first pixel region. The second light-emitting layer is provided in the second pixel region. The third light-emitting layer is provided in the third pixel region. The first electric charge injection layer is provided across the entire display area. The second electric charge injection layer is provided only in the third pixel region. The fourth light-emitting layer is provided at least in the third pixel region.

Claims (44)

1 . A display device having a display area including a first pixel region, a second pixel region, and a third pixel region, the display device comprising:

a first electrode;

a first photoelectric conversion layer including

a first light-emitting layer that emits light of a first color,

a second light-emitting layer that emits light of a second color that differs from the first color, and

a third light-emitting layer that emits light of a third color that differs from the first color and the second color;

a first electric charge injection layer having an opposite polarity from the first electrode;

a second electric charge injection layer having a same polarity as the first electrode;

a second photoelectric conversion layer including a fourth light-emitting layer that emits light of the third color; and

a second electrode having an opposite polarity from the first electrode, wherein

the first light-emitting layer is provided in the first pixel region,

the second light-emitting layer is provided in the second pixel region,

the third light-emitting layer is provided in the third pixel region,

the first electric charge injection layer is provided across the entire display area,

the second electric charge injection layer is provided only in the third pixel region, and

the fourth light-emitting layer is provided at least in the third pixel region.

2 . The display device according to claim 1 , wherein the fourth light-emitting layer is provided across the entire display area.

3 . The display device according to claim 1 , wherein

the second photoelectric conversion layer further includes a charge transport layer disposed between the second electric charge injection layer and the fourth light-emitting layer and having a same polarity as the second electric charge injection layer, and

the charge transport layer is provided at least in the third pixel region.

4 . The display device according to claim 3 , wherein the charge transport layer is provided across the entire display area.

5 . The display device according to claim 1 , further comprising an electrically conductive transparent film between the first electric charge injection layer and the second electric charge injection layer, wherein the electrically conductive transparent film is provided at least in the first pixel region and the second pixel region.

6 . The display device according to claim 5 , wherein the electrically conductive transparent film is provided across the entire display area.

7 . The display device according to claim 1 , wherein either one of the first electrode and the second electrode includes a transparent electrode, and another one of the first electrode and the second electrode includes a reflective electrode.

8 . The display device according to claim 1 , wherein the first electrode and the second electrode each include a transparent electrode.

9 . The display device according to claim 1 , wherein

the first light-emitting layer has an emission wavelength that differs from an absorption wavelength of the fourth light-emitting layer, and

the second light-emitting layer has an emission wavelength that differs from the absorption wavelength of the fourth light-emitting layer.

10 . The display device according to claim 1 , wherein the third light-emitting layer has a luminous efficiency that is lower than a luminous efficiency of the first light-emitting layer and a luminous efficiency of the second light-emitting layer.

11 . The display device according to claim 1 , wherein the first electric charge injection layer contains a metal material.

12 . The display device according to claim 1 , wherein the second electric charge injection layer contains only an organic material.

13 . The display device according to claim 1 , wherein each layer from the first light-emitting layer to the fourth light-emitting layer contains quantum dots that emit light upon being excited by recombination of holes and electrons.

14 . The display device according to claim 1 , wherein each layer from the first light-emitting layer to the fourth light-emitting layer contains an organic material that emits light upon being excited by recombination of holes and electrons.

15 . A method of manufacturing a display device having a display area including a first pixel region, a second pixel region, and a third pixel region, the method comprising:

a first electrode formation step of forming a first electrode;

a first photoelectric conversion layer formation step of forming a first photoelectric conversion layer including a first light-emitting layer that emits light of a first color, a second light-emitting layer that emits light of a second color that differs from the first color, and a third light-emitting layer that emits light of a third color that differs from the first color and the second color;

a first electric charge injection layer formation step of forming a first electric charge injection layer having an opposite polarity from the first electrode;

a second electric charge injection layer formation step of forming a second electric charge injection layer having a same polarity as the first electrode;

a second photoelectric conversion layer formation step of forming a second photoelectric conversion layer including a fourth light-emitting layer; and

a second electrode formation step of forming a second electrode having an opposite polarity from the first electrode, wherein

the first photoelectric conversion layer formation step provides the first light-emitting layer in the first pixel region, the second light-emitting layer in the second pixel region, and the third light-emitting layer in the third pixel region,

the first electric charge injection layer formation step provides the first electric charge injection layer across the entire display area,

the second electric charge injection layer formation step provides the second electric charge injection layer only in the third pixel region, and

the second photoelectric conversion layer formation step provides the fourth light-emitting layer at least in the third pixel region.