Display device having light-emitting elements

Patent metadata

Field	Value
Publication number	US-9799714-B2
Application number	US-201715419138-A
Country	US
Kind code	B2
Filing date	Jan 30, 2017
Priority date	Dec 12, 2002
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

A display device includes a plurality of light-emitting elements aligned on a TFT substrate in a formation of a matrix. The plurality of light-emitting elements each have a flat surface portion and including a light-emitting layer, an anode, and a cathode, an insulating layer formed on the TFT substrate and under the light emitting element, and a tilted metal surface provided on a peripheral area surrounding the flat surface portion of the light-emitting element and having a tilt angle with respect to the flat surface portion of the light-emitting element. The tilted metal surface is provided on a surface of a slope of a bank that is provided on the insulation layer, and a width of a cross-section of the bank becomes smaller as the cross section comes farther away from a surface of the TFT substrate. A counter substrate is placed on the TFT substrate.

First claim

What is claimed is:

1. A display device including:
a plurality of light-emitting elements on a TFT substrate in a formation of a matrix;
a first electrode on the TFT substrate;
an insulation bank on the TFT substrate and the first electrode, the insulation bank having a surface of a slope;
a metal on the surface of the slope of the insulation bank;
a predetermined layer on the metal, the predetermined layer including a first layer made of an organic material and a second layer made of an inorganic material on the first layer; and
a sealing film on the plurality of light-emitting elements, the insulation bank, the predetermined layer, the metal, and the TFT substrate,
wherein the insulation bank covers an edge of the first electrode and have an opening exposing a part of a surface of the first electrode,
wherein a light emitting layer is arranged on the first electrode and the insulation bank,
wherein a second electrode is arranged on the light emitting layer,
wherein the opening overlaps a first region of the first electrode, a second region of the light emitting layer, and a third region of the second electrode in plan view,
wherein at least one of the plurality of light-emitting elements includes the first region of the first electrode, the second region of the light emitting layer, and the third region of the second electrode,
wherein the predetermined layer is arranged directly above the part of the surface of the first electrode,
wherein the plurality of light emitting elements emit light in a direction from the TFT substrate to the sealing film, and
wherein a first thickness of the predetermined layer is smaller than a second thickness of the insulation bank.

2. The display device according to claim 1 , wherein a first refraction index of the first layer is larger than a second refraction index of the second layer.

3. The display device according to claim 2 , wherein a third refraction index of the second electrode is smaller than the first refraction index.

4. The display device according to claim 1 , further including:
a predetermined metal between the TFT substrate and the insulation bank;
an insulation layer between the predetermined metal and the insulation bank; and
an extended metal connected to the first electrode,
wherein the metal is connected to the second electrode,
wherein the predetermined metal is connected to the extended metal via a contact hole in the insulation layer, and
wherein each of the insulation bank and the metal overlaps the extended metal and the contact hole in plan view.

5. The display device according to claim 4 , wherein the insulation bank is sandwiched between the metal and the extended metal.

6. The display device according to claim 5 , further comprising:
a plurality of driver elements each connected to corresponding one of the plurality of light-emitting elements;
a plurality of capacitor elements each of which is connected to corresponding one of the light emitting elements and receives a corresponding image signal; and
a plurality of switching elements each of which is connected to corresponding one of the capacitor elements and corresponding one of the light emitting elements and controls input of the corresponding image signal to the corresponding one of the capacitor elements,
wherein the predetermined metal is connected to corresponding one of the plurality of driver elements.

7. The display device according to claim 1 , wherein the sealing film includes a plurality of inorganic layers and a resin layer.

8. The display device according to claim 1 , wherein the first layer is a resin material, and the second layer is a transparent material selected from a group consisting of a silicon nitride, silicon oxide, and a titanium oxide.

9. The display device according to claim 1 , wherein the metal is formed at a different layer of the second electrode.

10. The display device according to claim 1 , wherein both of the metal of one of the light emitting elements and the metal of another of the light emitting elements adjacent to one of the light emitting elements are formed at a same layer.

11. The display device according to claim 1 , wherein the insulation layer has the second thickness at a central portion of the insulation bank between one of the light emitting elements and another of the light emitting elements adjacent to one of the light emitting elements.

12. A display device including:
a plurality of light-emitting elements on a TFT substrate in a formation of a matrix;
a first electrode on the TFT substrate;
an insulation bank on the TFT substrate and the first electrode, the insulation bank having a surface of a slope;
a tilted metal on the surface of the slope of the insulation bank, the tilted metal having a tilted angle against the TFT substrate; and
a predetermined layer on the titled metal, the predetermined layer including a first layer made of an organic material and a second layer made of an inorganic material on the first layer; and
a sealing film on the plurality of light-emitting elements, the insulation bank, the predetermined layer, the tilted metal, and the TFT substrate,
wherein the insulation bank covers an edge of the first electrode and have an opening exposing a part of a surface of the first electrode,
wherein a light emitting layer is arranged on the first electrode and the insulation bank,
wherein a second electrode is arranged on the light emitting layer,
wherein the opening overlaps a first region of the first electrode, a second region of the light emitting layer, and a third region of the second electrode in plan view,
wherein at least one of the plurality of light-emitting elements includes the first region of the first electrode, the second region of the light emitting layer, and the third region of the second electrode,
wherein the predetermined layer is arranged directly above the part of the surface of the first electrode,
wherein the plurality of light emitting elements emit light in a direction from the TFT substrate to the sealing film,
wherein a first thickness of the predetermined layer is smaller than a second thickness of the insulation bank, and
wherein a third thickness of the second electrode is smaller than each of a fourth thickness of the first layer and a fifth thickness of the second layer.

13. The display device according to claim 12 , wherein a first refraction index of the first layer is larger than a second refraction index of the second layer.

14. The display device according to claim 13 , wherein a third refraction index of the second electrode is smaller than the first refraction index.

15. The display device according to claim 12 , further including:
a predetermined metal between the TFT substrate and the insulation bank;
an insulation layer between the predetermined metal and the insulation bank; and
an extended metal connected to the first electrode,
wherein the tilted metal is connected to the second electrode,
wherein the predetermined metal is connected to the extended metal via a contact hole in the insulation layer, and
wherein each of the insulation bank and the tilted metal overlaps the extended metal and the contact hole in plan view.

16. The display device according to claim 15 , wherein the sealing film includes a plurality of inorganic layers and a resin layer.

17. The display device according to claim 15 , wherein the insulation bank is sandwiched between the tilted metal and the extended metal.

18. The display device according to claim 17 , further comprising:
a plurality

Assignees

• Japan Display Inc
• Panasonic Liquid Crystal Displ

Inventors

• Adachi Masaya
• Tsuji Kazutaka
• Murakami Hajime
• Nishimura Etsuko

Classifications

• H01L27/3262

  Electricity · mapped topic

• H01L51/5237

  Electricity · mapped topic

• H01L51/5271

  Electricity · mapped topic

• H01L51/525

  Electricity · mapped topic

• H01L27/3211

  Electricity · mapped topic