Display device having a recess portion in an insulating film and a light emitting layer

Patent metadata

Field	Value
Publication number	US-10068952-B2
Application number	US-201715416376-A
Country	US
Kind code	B2
Filing date	Jan 26, 2017
Priority date	Jan 27, 2016
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

According to one embodiment, a display device includes, a first insulating film including a recess portion having a first bottom surface and an inclined first side surface, a first electrode provided on the recess portion, a second insulating film provided on the first electrode, a light-emitting layer provided in the second insulating film and including a second bottom surface in contact with the first electrode and an inclined second side surface, and a second electrode provided on the light-emitting layer. The depth of the recess portion is greater than the thickness of the light-emitting layer, and the thickness of the second insulating film is greater than the depth of the recess portion.

First claim

What is claimed is:

1. A display device comprising:
a substrate;
a first insulating film provided on the substrate, including a first bottom surface and an inclined first side surface, and at least one recess portion having a first opening defined by the first side surface, an area of the first opening being greater than an area of the first bottom surface;
a first electrode provided on the at least one recess portion therealong;
a second insulating film provided on the first electrode;
a light-emitting layer provided in the second insulating film and including a second bottom surface in contact with a part of the first electrode which corresponds to the first bottom surface, an inclined second side surface, and a second opening defined by the second side surface, an area of the second opening being greater than that of the second bottom surface; and
a second electrode provided on the light-emitting layer,
a depth of the at least one recess portion being greater than a thickness of the light-emitting layer, and a thickness of the second insulating film being greater than a depth of the at least one recess portion.

2. The display device of claim 1 , wherein
the at least one recess portion of the first insulating film is at least one groove.

3. The display device of claim 2 , further comprising:
a data signal line and a scanning line,
wherein
the at least one grooves intersects at least one of the data signal line and the scanning line.

4. The display device of claim 1 , wherein
the at least one recess portion of the first insulating film comprises at least two grooves, wherein a first groove of the at least two grooves intersects a second groove of the at least two grooves.

5. The display device of claim 1 , wherein
the second insulating film includes a third side surface inclined at an angle of α, with respect to a surface parallel to the first bottom, and
the angle α satisfies:
α>arcsin( n 2/ n 1)

where n1 represents a refractive index of the light-emitting layer and n2 represents a refractive index of the second insulating film.

6. The display device of claim 5 , wherein
the first electrode includes a fourth side surface inclined at an angle of am, with respect to the surface parallel to the first bottom, and
the angle αm satisfies:
45°≤α m ≤arcsin( n 2/ n 1).

7. The display device of claim 6 , wherein
the angle αm satisfies:
55°≤α m≤ 80°.

8. The display device of claim 5 , wherein
the angle α satisfies:
70°≤α≤80°.

9. The display device of claim 1 , wherein
a diameter of the second bottom surface is less than that of the first bottom surface.

10. The display device of claim 1 , wherein
the second insulating film is in contact with the first electrode in a region where the at least one recess portion is formed.

11. The display device of claim 1 , wherein
the first insulating film has a first thickness in a region where the first bottom surface is formed and a second thickness greater than the first thickness.

12. The display device of claim 1 , wherein
the at least one recess portion includes a first recess portion and a second recess portion, and
a distance between a center of the third bottom surface of the light-emitting layer in the first recess portion and that of the fourth bottom surface of the first recess portion is a first distance, and a distance between a center of the fifth bottom surface of the light-emitting layer in the second recess portion and that of a sixth bottom of the second recess portion is differing from the first distance.

13. A display device including first and second sub-pixels, each of the first and second sub-pixels comprising:
a substrate;
a first insulating film provided on the substrate, including a first bottom surface and an inclined first side surface, and at least one recess portion having a first opening defined by the first side surface, an area of the first opening being greater than an area of the first bottom surface;
a first electrode provided on the at least one recess portion therealong;
a second insulating film provided on the first electrode;
a light-emitting layer provided in the second insulating film and including a second bottom surface in contact with a part of the first electrode which corresponds to the first bottom surface, an inclined second side surface, and a second opening defined by the second side surface, an area of the second opening being greater than that of the second bottom surface; and
a second electrode provided on the light-emitting layer,
a depth of the at least one recess portion being greater than a thickness of the light-emitting layer, and a thickness of the second insulating film being greater than a depth of the at least one recess portion.

14. The display device of claim 13 , wherein
the at least one recess portion of the first insulating film in each of the first and second sub-pixels includes a first recess portion and a second recess portion, a position of a third bottom surface of the light-emitting layer in the first recess portion is displaced in a first direction from a central portion of a fourth bottom surface of the first recess portion and a position of a fifth bottom surface of the light-emitting layer in the second recess portion is displaced in a second direction different from the first direction from a central portion of a sixth bottom surface of the second recess portion.

15. The display device of claim 13 , wherein
the at least one recess portion of the first insulating film in the first sub-pixel includes a first recess portion and a second recess portion, a position of a third bottom surface of the light-emitting layer in the first recess portion is displaced in a first direction from a central portion of a fourth bottom surface of the first recess portion and a position of a fifth bottom surface of the light-emitting layer in the second recess portion is displaced in a second direction different from the first direction from a central portion of a sixth bottom surface of the second recess portion, and
the at least one recess portion of the first insulating film in the second sub-pixel includes a third recess portion corresponding to the first recess portion and a fourth recess portion corresponding to the second recess portion, a position of a seventh bottom surface of the light-emitting layer in the third recess portion is displaced in the second direction from a central portion of an eighth bottom surface of the third recess portion and a position of a ninth bottom surface of the light-emitting layer in the fourth recess portion is displaced in the first direction from a central portion of a tenth bottom surface of the fourth recess portion.

16. The display device of claim 13 , wherein
the at least one recess portion of the first insulating film in the first sub-pixel includes a first recess portion, a position of a third bottom surface of the light-emitting layer in the first recess portion is displaced in a first direction from a central portion of a fourth bottom surface of the first recess portion, and
the at least one recess portion of the first insulating film in the second sub-pixel includes a second recess portion, a position of a fifth bottom surface of the light-emitting layer in the second recess portion is displaced in a second direction different from the first direction from a central portion of a sixth bottom surface of the second recess portion.

17. The display device of claim 13 , wherein
the second insulating film includes a third side surface inclined at an angle of a, with

Assignees

• Joled Inc

Inventors

• Teramoto Kazuma
• Nendai Kenichi
• Yamada Jiro

Classifications

• H01L27/3246 Primary

  Electricity · mapped topic

• H01L27/3276

  Electricity · mapped topic

• H01L27/3211

  Electricity · mapped topic

• H01L27/326

  Electricity · mapped topic

• H10K59/35

  comprising red-green-blue [RGB] subpixels · CPC title