IP Library › Granted Patent US 9,343,515
Granted Patent B2
US 9,343,515 · App. 14/215,692 · Granted May 17, 2016

Display device, manufacturing method thereof, and electronic device

Inventors: Nozomu Sugisawa (Atsugi, JP); Hisao Ikeda (Zama, JP); Katsuhiro Kikuchi (Osaka, JP); Manabu Niboshi (Osaka, JP); Satoshi Inoue (Osaka, JP); Yuto Tsukamoto (Osaka, JP); Shinichi Kawato (Osaka, JP)
Assignees: Semiconductor Energy Laboratory Co., Ltd.; Sharp Kabushiki Kaisha
H01L27/3246H01L51/5218H01L51/5265H01L51/5281
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Quick Facts
Patent No.
US 9,343,515
App. No.
14/215,692
Granted
May 17, 2016
Kind
B2
Abstract

A display device that includes a reflective electrode; a transparent electrode; a partition; an EL layer formed over the partition and the transparent electrode; a semi-transmissive electrode formed over the EL layer; and a coloring layer over the semi-transmissive electrode. A light-emitting region is formed to overlap with the transparent electrode, the EL layer, the semi-transmissive electrode, and the coloring layer. A non-light-emitting region is formed to overlap with the transparent electrode, the partition, the EL layer, and the coloring layer. The non-light-emitting region is formed to surround the light-emitting region. The sum of the optical length of the transparent electrode and the optical length of the EL layer is adjusted to fulfill a condition of a microcavity intensifying light of the color of the coloring layer. The optical length of the partition in the non-light-emitting region is adjusted to weaken external light incident through the coloring layer.

Claims (132)

1. A display device comprising:

a reflective electrode;

a transparent electrode over the reflective electrode;

a partition surrounding the transparent electrode and the reflective electrode and overlapping the transparent electrode;

a layer containing a light-emitting organic compound over the partition and the transparent electrode;

a semi-transmissive electrode over the layer containing the light-emitting organic compound; and

a coloring layer over the semi-transmissive electrode,

wherein a light-emitting region is provided in a region which overlaps the transparent electrode, the layer containing the light-emitting organic compound, the semi-transmissive electrode, and the coloring layer,

wherein a non-light-emitting region is provided in a region which overlaps the transparent electrode, the partition, the layer containing the light-emitting organic compound, and the coloring layer,

wherein the non-light-emitting region surrounds the light-emitting region,

wherein a sum of an optical length of the transparent electrode and an optical length of the layer containing the light-emitting organic compound is adjusted to fulfill a condition of a microcavity intensifying light of a color of the coloring layer, and

wherein an optical length of the partition in the non-light-emitting region is adjusted to weaken external light incident through the coloring layer.

2. The display device according to claim 1 , wherein the optical length of the partition in the non-light-emitting region is adjusted to a multiple of a ½ wavelength of a wavelength of the color of the coloring layer.

3. The display device according to claim 2 , wherein the color of the coloring layer is green.

4. An electronic device comprising the display device according to claim 1 .

5. A display device comprising:

a reflective electrode;

a transparent electrode over the reflective electrode;

a partition surrounding the transparent electrode and the reflective electrode;

a layer containing a light-emitting organic compound over the transparent electrode;

a semi-transmissive electrode over the layer containing the light-emitting organic compound; and

a coloring layer over the semi-transmissive electrode and the partition,

wherein the partition is a stacked-layer film including a first insulating layer and a second insulating layer with different refractive indices,

wherein a light-emitting region is provided in a region which overlaps the transparent electrode, the layer containing the light-emitting organic compound, the semi-transmissive electrode, and the coloring layer,

wherein a non-light-emitting region is provided in a region which overlaps the transparent electrode, the partition, the layer containing the light-emitting organic compound, and the coloring layer,

wherein the non-light-emitting region surrounds the light-emitting region,

wherein a sum of an optical length of the transparent electrode and an optical length of the layer containing the light-emitting organic compound is adjusted to fulfill a condition of a microcavity intensifying light of a color of the coloring layer, and

wherein an optical length of the second insulating layer in the non-light-emitting region is adjusted to weaken external light incident through the coloring layer.

6. The display device according to claim 5 ,

wherein when the refractive index of the first insulating layer is smaller than the refractive index of the second insulating layer, the optical length of the second insulating layer is adjusted to a sum of the optical length of the transparent electrode and a wavelength of the color of the coloring layer multiplied by (2N−1)/4 (N is a natural number), and

wherein when the refractive index of the first insulating layer is larger than the refractive index of the second insulating layer, the optical length of the second insulating layer is adjusted to a sum of the optical length of the transparent electrode and a multiple of a ½ wavelength of the wavelength of the color of the coloring layer.

7. The display device according to claim 6 , wherein a difference between the refractive index of the first insulating layer and the refractive index of the second insulating layer is 0.1 or more.

8. The display device according to claim 5 , wherein the color of the coloring layer is green.

9. An electronic device comprising the display device according to claim 5 .

10. A display device comprising:

a first reflective electrode and a second reflective electrode;

a first transparent electrode over the first reflective electrode;

a second transparent electrode over the second reflective electrode;

a first partition surrounding the first reflective electrode and the first transparent electrode over the first transparent electrode;

a second partition surrounding the second reflective electrode and the second transparent electrode over the second transparent electrode;

a layer containing a light-emitting organic compound over the first partition, the second partition, the first transparent electrode, and the second transparent electrode;

a semi-transmissive electrode over the layer containing the light-emitting organic compound; and

a first coloring layer and a second coloring layer over the semi-transmissive electrode,

wherein a first light-emitting region is provided in a region which overlaps the first transparent electrode, the layer containing the light-emitting organic compound, the semi-transmissive electrode, and the first coloring layer,

wherein a first non-light-emitting region is provided in a region which overlaps the first transparent electrode, the first partition, the layer containing the light-emitting organic compound, and the first coloring layer,

wherein the first non-light-emitting region surrounds the first light-emitting region,

wherein a sum of an optical length of the first transparent electrode and an optical length of the layer containing the light-emitting organic compound is adjusted to fulfill a condition of a microcavity intensifying light of a color of the first coloring layer,

wherein an optical length of the first partition is adjusted to weaken external light incident through the first coloring layer,

wherein a second light-emitting region is provided in a region which overlaps the second transparent electrode, the layer containing the light-emitting organic compound, the semi-transmissive electrode, and the second coloring layer,

wherein a second non-light-emitting region is provided in a region which overlaps the second transparent electrode, the second partition, the layer containing the light-emitting organic compound, and the second coloring layer,

wherein the second non-light-emitting region surrounds the second light-emitting region,

wherein a sum of an optical length of the second transparent electrode and the optical length of the layer containing the light-emitting organic compound is adjusted to fulfill a condition of a microcavity intensifying light of a color of the second coloring layer, and

wherein an optical length of the second partition is adjusted to weaken external light incident through the second coloring layer.

11. The display device according to claim 10 ,

wherein the optical length of the first partition is adjusted to a multiple of a ½ wavelength of a wavelength of the color of the first coloring layer, and

wherein the optical length of the second partition is adjusted to a multiple of a ½ wavelength of a wavelength of the color of the second coloring layer.

12. The display device according to claim 10 ,

wherein the first partition comprises a first insulating layer,

wherein an optical length of the first insulating layer is adjusted to the multiple of the ½ wavelength of the wavelength of the color of the first coloring layer,

wherein the second partition comprises a stacked-layer film including the first insulating layer and a second insulating layer, and

wherein a sum of an optical length of the second insulating layer and the optical length of the first insulating layer is adjusted to the multiple of the ½ wavelength of the wavelength of the color of the second coloring layer.

13. The display device according to claim 10 , further comprising a light-blocking portion over the semi-transmissive electrode and between the first coloring layer and the second coloring layer.

14. An electronic device comprising the display device according to claim 10 .

15. A manufacturing method of a display device, comprising the steps of:

forming a transparent electrode over a reflective electrode;

forming a partition surrounding the transparent electrode and the reflective electrode and overlapping the transparent electrode;

forming a layer containing a light-emitting organic compound over the partition and the transparent electrode;

forming a semi-transmissive electrode over the layer containing the light-emitting organic compound; and

placing a coloring layer over the semi-transmissive electrode,

wherein a light-emitting region is provided in a region which overlaps the transparent electrode, the layer containing the light-emitting organic compound, the semi-transmissive electrode, and the coloring layer,

wherein a non-light-emitting region is provided in a region which overlaps the transparent electrode, the partition, the layer containing the light-emitting organic compound, and the coloring layer,

wherein a sum of an optical length of the transparent electrode and an optical length of the layer containing the light-emitting organic compound is adjusted to fulfill a condition of a microcavity intensifying light of a color of the coloring layer, and

wherein an optical length of the partition in the non-light-emitting region is adjusted to weaken external light incident through the coloring layer.

16. The manufacturing method of the display device according to claim 15 , wherein the optical length of the partition in the non-light-emitting region is adjusted to a multiple of a ½ wavelength of a wavelength of the color of the coloring layer.

17. A manufacturing method of a display device, comprising the steps of:

forming a transparent electrode over a reflective electrode;

forming a partition including a first insulating layer and a second insulating layer with different refractive indices, surrounding the transparent electrode and the reflective electrode, and overlapping the transparent electrode;

forming a layer containing a light-emitting organic compound over the partition and the transparent electrode;

forming a semi-transmissive electrode over the layer containing the light-emitting organic compound; and

placing a coloring layer over the semi-transmissive electrode,

wherein a light-emitting region is provided in a region which overlaps the transparent electrode, the layer containing the light-emitting organic compound, the semi-transmissive electrode, and the coloring layer,

wherein a non-light-emitting region is provided in a region which overlaps the transparent electrode, the partition, the layer containing the light-emitting organic compound, and the coloring layer,

wherein the non-light-emitting region surrounds the light-emitting region,

wherein a sum of an optical length of the transparent electrode and an optical length of the layer containing the light-emitting organic compound is adjusted to fulfill a condition of a microcavity intensifying light of a color of the coloring layer, and

wherein an optical length of the second insulating layer in the non-light-emitting region is adjusted to weaken external light incident through the coloring layer.

18. The manufacturing method of the display device according to claim 17 ,

wherein when the refractive index of the first insulating layer is smaller than the refractive index of the second insulating layer, the optical length of the second insulating layer is adjusted to a sum of the optical length of the transparent electrode and a wavelength of the color of the coloring layer multiplied by (2N−1)/4 (N is a natural number), and

wherein when the refractive index of the first insulating layer is larger than the refractive index of the second insulating layer, the optical length of the second insulating layer is adjusted to a sum of the optical length of the transparent electrode and a multiple of a ½ wavelength of the wavelength of the color of the coloring layer.

19. A manufacturing method of a display device, comprising the steps of:

forming a first reflective electrode in a first light-emitting region and a first non-light-emitting region surrounding the first light-emitting region, and forming a second reflective electrode in a second light-emitting region and a second non-light-emitting region surrounding the second light-emitting region;

forming a first transparent electrode over the first reflective electrode, and forming a second transparent electrode over the second reflective electrode;

forming a partition with a first thickness over the first transparent electrode and the second transparent electrode;

forming a first photoresist over the partition in the first non-light-emitting region;

etching the partition with the first photoresist as a mask to keep the first thickness of the partition in the first non-light-emitting region and to make the partition in the second non-light-emitting region have a second thickness smaller than the first thickness;

removing the first photoresist;

forming a second photoresist over the partition in each of the first non-light-emitting region and the second non-light-emitting region;

etching the partition with the second photoresist as a mask to remove the partition in each of the first light-emitting region and the second light-emitting region;

removing the second photoresist;

forming a layer containing a light-emitting organic compound over the partition, the first transparent electrode, and the second transparent electrode;

forming a semi-transmissive electrode over the layer containing the light-emitting organic compound; and

placing a first coloring layer and a second coloring layer over the semi-transmissive electrode,

wherein the first light-emitting region is a region which overlaps the first transparent electrode, the layer containing the light-emitting organic compound, the semi-transmissive electrode, and the first coloring layer,

wherein the first non-light-emitting region is a region which overlaps the first transparent electrode, the partition, the layer containing the light-emitting organic compound, and the first coloring layer,

wherein a sum of an optical length of the first transparent electrode and an optical length of the layer containing the light-emitting organic compound in the first light-emitting region is adjusted to fulfill a condition of a microcavity intensifying light of a color of the first coloring layer,

wherein an optical length of the partition in the first non-light-emitting region is adjusted to weaken external light incident through the first coloring layer,

wherein the second light-emitting region is a region which overlaps the second transparent electrode, the layer containing the light-emitting organic compound, the semi-transmissive electrode, and the second coloring layer,

wherein the second non-light-emitting region is a region which overlaps the second transparent electrode, the partition, the layer containing the light-emitting organic compound, and the second coloring layer,

wherein a sum of a thickness of the second transparent electrode and a thickness of the layer containing the light-emitting organic compound in the second light-emitting region is adjusted to fulfill a condition of a microcavity intensifying light of a color of the second coloring layer, and

wherein an optical length of the partition in the second non-light-emitting region is adjusted to weaken external light incident through the second coloring layer.

20. The manufacturing method of the display device according to claim 19 ,

wherein the optical length of the partition in the first non-light-emitting region is adjusted to a multiple of a ½ wavelength of a wavelength of the color of the first coloring layer, and

wherein the optical length of the partition in the second non-light-emitting region is adjusted to a multiple of a ½ wavelength of a wavelength of the color of the second coloring layer.

21. A manufacturing method of a display device, comprising the steps of:

forming a first reflective electrode in a first light-emitting region and a first non-light-emitting region surrounding the first light-emitting region, and forming a second reflective electrode in a second light-emitting region and a second non-light-emitting region surrounding the second light-emitting region;

forming a first transparent electrode over the first reflective electrode, and forming a second transparent electrode over the second reflective electrode;

forming a first insulating layer over the first transparent electrode in the first non-light-emitting region and over the second transparent electrode in the second non-light-emitting region;

forming a second insulating layer over the first insulating layer in the second non-light-emitting region;

forming a layer containing a light-emitting organic compound over the first insulating layer in the first non-light-emitting region, the second insulating layer in the second non-light-emitting region, the first transparent electrode in the first light-emitting region, and the second transparent electrode in the second light-emitting region;

forming a semi-transmissive electrode over the layer containing the light-emitting organic compound; and

placing a first coloring layer and a second coloring layer over the semi-transmissive electrode,

wherein the first insulating layer and the second insulating layer form a partition,

wherein the first light-emitting region is a region which overlaps the first transparent electrode, the layer containing the light-emitting organic compound, the semi-transmissive electrode, and the first coloring layer,

wherein the first non-light-emitting region is a region which overlaps the first transparent electrode, the partition, the layer containing the light-emitting organic compound, and the first coloring layer,

wherein a sum of an optical length of the first transparent electrode and an optical length of the layer containing the light-emitting organic compound in the first light-emitting region is adjusted to fulfill a condition of a microcavity intensifying light of a color of the first coloring layer,

wherein an optical length of the partition in the first non-light-emitting region is adjusted to weaken external light incident through the first coloring layer,

wherein the second light-emitting region is a region which overlaps the second transparent electrode, the layer containing the light-emitting organic compound, the semi-transmissive electrode, and the second coloring layer,

wherein the second non-light-emitting region is a region which overlaps the second transparent electrode, the partition, the layer containing the light-emitting organic compound, and the second coloring layer,

wherein a sum of a thickness of the second transparent electrode and a thickness of the layer containing the light-emitting organic compound in the second light-emitting region is adjusted to fulfill a condition of a microcavity intensifying light of a color of the second coloring layer, and

wherein an optical length of the partition in the second non-light-emitting region is adjusted to weaken external light incident through the second coloring layer.

22. The manufacturing method of the display device according to claim 21 ,

wherein the optical length of the partition in the first non-light-emitting region is adjusted to a multiple of a ½ wavelength of a wavelength of the color of the first coloring layer, and

wherein the optical length of the partition in the second non-light-emitting region is adjusted to a multiple of a ½ wavelength of a wavelength of the color of the second coloring layer.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 17, 2014
From: SUGISAWA, NOZOMU; IKEDA, HISAO; KIKUCHI, KATSUHIRO; NIBOSHI, MANABU; INOUE, SATOSHI; TSUKAMOTO, YUTO; KAWATO, SHINICHI
To: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.; SHARP KABUSHIKI KAISHA
Reel/Frame 032454/0555 →
Priority Claims (1)
JP 2013-058654 · Mar 21, 2013 · national
Continuity (1)
Related Publication 20140284576A1 · Sep 25, 2014