Unit pixel having light emitting device and displaying apparatus

Patent metadata

Field	Value
Publication number	US-11843077-B2
Application number	US-202117168958-A
Country	US
Kind code	B2
Filing date	Feb 5, 2021
Priority date	Feb 11, 2020
Publication date	Dec 12, 2023
Grant date	Dec 12, 2023

Abstract

A unit pixel includes a transparent substrate, a plurality of light emitting devices arranged on the transparent substrate, and an optical layer disposed between the light emitting devices and the transparent substrate and transmitting light emitted from the light emitting devices. The transparent substrate has a concavo-convex pattern on a surface facing the light emitting devices.

First claim

What is claimed is:

1. A unit pixel, comprising:
a transparent substrate;
a plurality of light emitting devices arranged on the transparent substrate; and
an optical layer disposed between the plurality of light emitting devices and the transparent substrate and transmitting light emitted from the plurality of light emitting devices; and
a step adjustment layer covering a light emitting device and adhered to the optical layer;
wherein the transparent substrate has a concavo-convex pattern on a surface facing the plurality of light emitting devices, and
wherein the plurality of light emitting devices includes light emitting devices that are arranged side by side to form a row.

2. A unit pixel, comprising:
a transparent substrate;
a plurality of light emitting devices arranged on the transparent substrate; and
an optical layer disposed between the plurality of light emitting devices and the transparent substrate and transmitting light emitted from the plurality of light emitting devices, and
wherein the transparent substrate has a concavo-convex pattern on a surface facing the plurality of light emitting devices, and
wherein each of the plurality of light emitting devices has roughness on a surface facing the transparent substrate.

3. The unit pixel of claim 1 , wherein:
the plurality of light emitting devices includes at least three light emitting devices emitting light of different colors from one another, and
the at least three light emitting devices are arranged side by side to form a row.

4. The unit pixel of claim 1 ,
wherein the optical layer is an adhesive layer.

5. The unit pixel of claim 4 , further comprising:
connection layers disposed on the step adjustment layer, and electrically connected to the plurality of light emitting devices.

6. The unit pixel of claim 5 ,
each of the plurality of light emitting devices including:
a light emitting structure including a first conductivity type semiconductor layer, a second conductivity type semiconductor layer, and an active layer interposed between the first conductivity type semiconductor layer and the second conductivity type semiconductor layer; and
a first electrode pad and a second electrode pad disposed on the light emitting structure;

wherein:
the step adjustment layer has openings exposing the first electrode pad and the second electrode pad, and
the connection layers are electrically connected to the first electrode pad and the second electrode pad through the openings of the step adjustment layer.

7. The unit pixel of claim 6 , further comprising:
a protection layer covering the step adjustment layer and contact layers,
wherein the protection layer has openings located on the contact layers.

8. The unit pixel of claim 7 , further comprising:
bumps disposed in the openings of the protection layer,
wherein the bumps are electrically connected to the contact layers, respectively.

9. The unit pixel of claim 1 ,
wherein the light emitting devices are configured to emit red, green, and blue light.

10. The unit pixel of claim 1 , further comprising:
a light blocking layer disposed between the optical layer and the transparent substrate,
wherein the light blocking layer has windows configured to transmit light generated from the plurality of light emitting devices.

11. The unit pixel of claim 10 ,
wherein at least one of the windows has an extension extending in a direction perpendicular to a direction in which the plurality of light emitting devices are arranged.

12. The unit pixel of claim 10 ,
wherein at least one of the windows has an extension extending in a diagonal direction.

13. The unit pixel of claim 10 ,
wherein the windows are arranged to correspond to each of the plurality of light emitting devices.

14. The unit pixel of claim 10 ,
wherein the concavo-convex pattern of the transparent substrate is disposed corresponding to the windows.

15. A pixel module, comprising:
a circuit board; and
a plurality of unit pixels disposed on the circuit board,
wherein the plurality of unit pixels includes a unit pixel comprising:
a transparent substrate;
a plurality of light emitting devices arranged on the transparent substrate; and

an optical layer disposed between the plurality of light emitting devices and the transparent substrate and transmitting light emitted from the plurality of light emitting devices,
wherein the transparent substrate has a concavo-convex pattern on a surface facing the plurality of light emitting devices,
wherein the optical layer is an adhesive layer;
wherein each of the plurality of light emitting devices has roughness on a surface facing the transparent substrate.

16. The pixel module of claim 15 ,
the unit pixel, further comprising:
a light blocking layer disposed between the optical layer and the transparent substrate,
wherein the light blocking layer has windows configured to transmit light generated from the plurality of light emitting devices.

17. The pixel module of claim 16 ,
wherein the concavo-convex pattern of the transparent substrate is disposed corresponding to the windows.

18. The pixel module of claim 15 ,
the unit pixel further including:
a step adjustment layer covering a light emitting device and adhered to the adhesive layer;
connection layers disposed on the step adjustment layer, and electrically connected to the plurality of light emitting devices; and
a protection layer covering the step adjustment layer and contact layers,
wherein the protection layer has openings located on the contact layers.

19. The pixel module of claim 15 , wherein:
the plurality of light emitting devices includes at least three light emitting devices emitting light of different colors, and
the at least three light emitting devices are arranged side by side to form a row.

20. A displaying apparatus, comprising:
a panel substrate; and
a plurality of pixel modules arranged on the panel substrate,
each of the plurality of pixel modules including:
a circuit board; and
a plurality of unit pixels disposed on the circuit board,

each of the plurality of unit pixels including:
a transparent substrate;
a plurality of light emitting devices arranged on the transparent substrate; and
an optical layer disposed between the plurality of light emitting devices and the transparent substrate and transmitting light emitted from the plurality of light emitting devices,
wherein the transparent substrate has a concavo-convex pattern on a surface facing the plurality of light emitting devices.

Assignees

• Seoul Viosys Co Ltd

Inventors

• Cha Namgoo
• Kim Sangmin
• Ahn Jung Hwan
• Lim Jae Hee

Classifications

• H10H20/8312

  extending at least partially through the bodies · CPC title

• H10H20/82

  Roughened surfaces, e.g. at the interface between epitaxial layers · CPC title

• H10H20/821

  of the light-emitting regions, e.g. non-planar junctions · CPC title

• H10H20/851

  Wavelength conversion means · CPC title

• H10H20/84

  Coatings, e.g. passivation layers or antireflective coatings · CPC title