Light emitting device and LED display apparatus including the same

Patent metadata

Field	Value
Publication number	US-11749708-B2
Application number	US-202017134985-A
Country	US
Kind code	B2
Filing date	Dec 28, 2020
Priority date	Jan 3, 2020
Publication date	Sep 5, 2023
Grant date	Sep 5, 2023

Abstract

A display apparatus includes a display substrate, and light emitting devices arranged on an upper surface of the display substrate. At least one of the light emitting devices includes a first LED unit including a first light emitting stack, a second LED unit including a second light emitting stack, and a third LED unit including a third light emitting stack. Each of the first to third light emitting stacks includes a first conductivity type semiconductor layer and a second conductivity type semiconductor layer. the first conductivity type semiconductor layer and the second conductivity type semiconductor layer in each of the first to third light emitting stacks are stacked in a horizontal direction with respect to the upper surface of the display substrate. At least one of the second conductivity type semiconductor layers in the first to third light emitting stacks is divided into two regions.

First claim

What is claimed is:

1. A display apparatus comprising:
a display substrate;
light emitting devices arranged over an upper surface of the display substrate, one or more light emitting devices comprising:
a first LED unit comprising a first light emitter;
a second LED unit comprising a second light emitter; and
a third LED unit comprising a third light emitter; and
a module substrate disposed between the display substrate and the light emitting devices and having a first surface on which the light emitting devices are arranged along a direction parallel to the first surface and a second surface opposite to the first surface; and
a driver disposed on the second surface of the module substrate, and
wherein the second LED unit is disposed between the first LED unit and the third LED unit,
each of the first, the second and the third light emitters comprises a first conductivity type semiconductor layer and a second conductivity type semiconductor layer,
the first conductivity type semiconductor layer and the second conductivity type semiconductor layer in each of the first, the second, and the third light emitters are disposed perpendicular to the upper surface of the display substrate and stacked in a horizontal direction with respect to the upper surface of the display substrate,
the module substrate comprises a connector formed on the module substrate and electrically connecting the light emitting devices to the driver.

2. The display apparatus according to claim 1 , wherein:
each of the first to third light emitters further comprises an active layer interposed between the first conductivity type semiconductor layer and the second conductivity type semiconductor layer.

3. The display apparatus according to claim 1 , wherein the first, the second and the third LED units are configured to emit different colored lights from one another, the different colored lights including red light, green light, and blue light.

4. The display apparatus according to claim 3 , wherein the second LED unit is configured to emit red light.

5. The display apparatus according to claim 1 , wherein the one or more light emitting devices further comprise electrodes electrically connected to the first, the second and the third LED units, respectively,
the electrodes further comprising individual electrodes electrically connected to regions of the second conductivity type semiconductor layer, respectively.

6. The display apparatus according to claim 5 , further comprising:
a common electrode commonly electrically connected to the first, the second and the third LED units.

7. The display apparatus according to claim 6 , wherein the electrodes and the common electrode are disposed between at least one light emitting device and the display substrate.

8. The display apparatus according to claim 5 , wherein the light emitting devices further comprise an insulating layer having openings, and the electrodes are disposed on the insulating layer and are electrically connected to the first, the second and the third LED units through the openings.

9. The display apparatus according to claim 1 , wherein the light emitting devices are spaced apart from one another by a black material.

10. The display apparatus according to claim 1 , further comprising:
electrodes individually electrically connected to the first to third LED units; and
a common electrode commonly electrically connected to the first to third LED units,
wherein the electrodes further comprise individual electrodes electrically connected to each of regions of the second conductivity type semiconductor layer, respectively.

11. The display apparatus according to claim 10 , wherein the individual electrodes and the common electrode are disposed on a same side surface of the light emitting device.

12. The display apparatus according to claim 1 , wherein:
the first LED unit further comprises a first reflective layer disposed on the first light emitter;
the second LED unit further comprises a second reflective layer disposed on the second light emitter; and
the third LED unit further comprises a third reflective layer disposed on the third light emitter.

13. The display apparatus according to claim 1 , wherein each of the first, the second and the third LED units further comprises contact electrodes forming ohmic contact with the second conductivity type semiconductor layers of the first, the second and the third light emitters,
the contact electrodes further comprising individual contact electrodes forming ohmic contact with each of regions of the second conductivity type semiconductor layer, respectively.

14. A display apparatus comprising:
a display substrate;
light emitting devices arranged over an upper surface of the display substrate, one or more light emitting devices comprising:
a first LED unit comprising a first light emitter;
a second LED unit comprising a second light emitter;
a third LED unit comprising a third light emitter;
a first bonding layer coupling the first LED unit to the second LED unit;
a second bonding layer coupling the second LED unit to the third LED unit; and
a module substrate disposed between the display substrate and the light emitting devices and having a first surface on which the light emitting devices are arranged along a direction parallel to the first surface and a second surface opposite to the first surface; and
a driver disposed on the second surface of the module substrate, and
wherein the first LED unit is coupled to the second LED unit which is coupled to the third LED unit, side by side, in a horizontal direction with respect to the upper surface of the display substrate, and
the module substrate comprises a connector formed on the module substrate and electrically connecting the light emitting devices to the driver.

15. The display apparatus according to claim 14 , wherein the first bonding layer, the second bonding layer, or both include an opaque material.

Assignees

• Seoul Viosys Co Ltd

Inventors

• Lee Chung Hoon
• Lee So Ra

Classifications

• H10W90/00

  Package configurations · CPC title

• H10D86/441

  Interconnections, e.g. scanning lines · CPC title

• H10H20/857

  Interconnections, e.g. lead-frames, bond wires or solder balls · CPC title

• H10H20/841

  Reflective coatings, e.g. dielectric Bragg reflectors · CPC title

• H10H20/8314

  extending at least partially onto an outer side surface of the bodies · CPC title