Light emitting device and fabricating method thereof

Patent metadata

Field	Value
Publication number	US-10211418-B2
Application number	US-201715650083-A
Country	US
Kind code	B2
Filing date	Jul 14, 2017
Priority date	Jul 15, 2016
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

A light emitting device includes a plurality of unit light emitting regions on a substrate. At least one of the unit light emitting regions includes at least one pair of first and second electrodes that are spaced apart, at least one first bar-type LED in a first layer on the substrate, and at least one second bar-type LED in a second layer on the substrate. At least one of the first bar-type LED or the second bar-type LED is electrically connected between the first electrode and the second electrode.

First claim

What is claimed is:

1. A light emitting device, comprising:
a plurality of unit light emitting regions on a substrate,
wherein at least one of the unit light emitting regions includes:
at least one pair of first and second electrodes that are spaced apart;
at least one first bar-type LED in a first layer on the substrate; and
at least one second bar-type LED in a second layer on the substrate, the second layer being on the first layer,

wherein at least one of the first bar-type LED or the second bar-type LED is electrically connected between the first electrode and the second electrode.

2. The light emitting device as claimed in claim 1 , wherein:
the first bar-type LED and the second bar-type LED emit light of different colors, and
one of the first and second bar-type LEDs having a longer wavelength than the other bar-type LED is disposed closer to the substrate.

3. The light emitting device as claimed in claim 1 , wherein at least one end of at least one of the first bar-type LED or the second bar-type LED is an electrically floated end.

4. The light emitting device as claimed in claim 1 , wherein the unit light emitting regions include:
a first unit light emitting region in which the first bar-type LED is electrically connected between the first electrode and the second electrode; and
a second unit light emitting region in which the second bar-type LED is electrically connected between the first electrode and the second electrode.

5. The light emitting device as claimed in claim 1 , wherein at least one of the unit light emitting regions includes at least one third bar-type LED in a third layer on the substrate.

6. The light emitting device as claimed in claim 5 , wherein the unit light emitting regions include:
a first unit light emitting region in which the first bar-type LED is electrically connected between the first electrode and the second electrode, the first unit light emitting region emitting light of a first color;
a second unit light emitting region in which the second bar-type LED is electrically connected between the first electrode and the second electrode, the second unit light emitting region emitting light of a second color; and
a third unit light emitting region in which the third bar-type LED is electrically connected between the first electrode and the second electrode, the third unit light emitting region emitting light of a third color.

7. The light emitting device as claimed in claim 5 , wherein:
first ends of the first bar-type LED the second bar-type LED, and the third bar-type LED are commonly connected to the first electrode, and
second ends of the first bar-type LED, the second bar-type LED, and the third bar-type LED are commonly connected to the second electrode.

8. The light emitting device as claimed in claim 5 , further comprising:
a first insulating layer between the first bar-type LED and the second bar-type LED;
a second insulating layer between the second bar-type LED and the third bar-type LED; and
a third insulating layer on the third bar-type LED.

9. The light emitting device as claimed in claim 8 , wherein:
at least one of the first bar-type LED, the second bar-type LED, or the third bar-type LED is aligned such that a first end of at least one of the first bar-type LED, the second bar-type LED, or the third bar-type LED overlaps the first electrode and a second end of at least one of the first bar-type LED, the second bar-type LED, or the third bar-type LED overlaps the second electrode.

10. The light emitting device as claimed in claim 9 , wherein at least one of the unit light emitting regions includes:
a first contact electrode penetrating the first insulating layer, the second insulating layer, and the third insulating layer, the first contact electrode electrically connecting, to the first electrode, one end of at least one of the first bar-type LED, the second bar-type LED, or the third bar-type LED; and
a second contact electrode penetrating the first insulating layer, the second insulating layer, and the third insulating layer, the second contact electrode electrically connecting, to the second electrode, the other end of at least one of the first bar-type LED, the second bar-type LED, or the third bar-type LED.

11. The light emitting device as claimed in claim 1 , wherein:
the first electrode is electrically connected to a first end of the first bar-type LED, and the second electrode is electrically connected to a second end of the first bar-type LED, and
at least one of the unit light emitting regions includes a third electrode electrically connected to a first end of the second bar-type LED and a fourth electrode electrically connected to a second end of the second bar-type LED.

12. The light emitting device as claimed in claim 1 , further comprising a first insulating layer interposed between the first bar-type LED and the second bar-type LED.

13. The light emitting device as claimed in claim 1 , wherein the first layer and the second layer are sequentially stacked on a surface of the substrate.

14. A method for fabricating a light emitting device, the method comprising:
forming at least one pair of first and second electrodes in each of unit light emitting regions on a substrate;
forming at least one first bar-type LED in the unit light emitting regions;
forming a first insulating layer over the first bar-type LED;
forming at least one second bar-type LED on the first insulating layer;
forming a second insulating layer over the second bar-type LED; and
forming a first contact electrode such that the first electrode is electrically connected to a first end of at least one of the first bar-type LED and the second bar-type LED, and forming a second contact electrode such that the second electrode is electrically connected to a second end of the bar-type LED at least connected to the first contact electrode.

15. The method as claimed in claim 14 , wherein:
the unit light emitting regions include a first unit light emitting region and a second unit light emitting region, and
the method includes:
after the first bar-type LED is formed, aligning the first bar-type LED between the first and second electrodes of the first unit light emitting region; and
after the second bar-type LED is formed, aligning the second bar-type LED between the first and second electrodes of the second unit light emitting region.

16. The method as claimed in claim 15 , wherein
aligning the first bar-type LED includes applying a first voltage between the first and second electrodes of the first unit light emitting region, and
aligning the second bar-type LED includes applying a second voltage greater than the first voltage between the first and second electrodes of the second unit light emitting region.

17. The method as claimed in claim 14 , further comprising:
aligning at least one of the first or second bar-type LEDs such that ends of at least one of the first or second bar-type LEDs are on the first and second electrodes, respectively.

18. The method as claimed in claim 17 , wherein forming the first and second contact electrodes includes:
forming a first contact hole penetrating the first and second insulating layers to expose a first end of at least one of the first or second bar-type LEDs and at least one region of the first electrode and a second contact hole penetrating the first and second insulating layers to expose a second end of at least one of the first or second bar-type LEDs and at least one region of the second electrode;
forming a first contact electrode t

Assignees

• Samsung Display Co Ltd

Inventors

• Im Hyun Deok
• Kang Jong Hyuk
• Kim Dae Hyun
• Lee Joo Yeol
• Cho Chi O
• Cho Hyun Min

Classifications

• H10W90/00 Primary

  Package configurations · CPC title

• H01L51/5296

  Electricity · mapped topic

• H01L27/32

  Electricity · mapped topic

• H01L51/5203

  Electricity · mapped topic

• H01L2933/0033

  Electricity · mapped topic