Granted Patent B2

US 10,068,952 · App. 15/416,376 · Granted Sep 4, 2018

Abstract

Claims (71)

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 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.

18. The display device of claim 17 , wherein

the first electrode includes a fourth side surface inclined at an angle of αm, with respect to the surface parallel to the first bottom, and

the angle αm satisfies:

45°≤α m ≤arcsin( n 2/ n 1).

19. The display device of claim 18 , wherein

the angle αm satisfies:

55°≤α m≤ 80°.

20. The display device of claim 17 , wherein

the angle α satisfies:

70°≤α≤80°.

Assignments (7)