Light emitting device and LED display apparatus having the same
A display apparatus including a circuit board, a plurality of light emitting devices mounted on the circuit board, a transparent substrate disposed on the light emitting devices, and a light absorbing layer disposed between the transparent substrate and the light emitting devices, in which the light absorbing layer covers upper regions of the light emitting devices and a region between the light emitting devices.
1 . A display apparatus, comprising:
a circuit board;
a first emitter, a second emitter, and a third emitter mounted on the circuit board;
a first connection electrode electrically connected to the first emitter;
a second connection electrode electrically connected to the second emitter;
a third connection electrode electrically connected to the third emitter;
a fourth connection electrode electrically connected to the third emitter;
a first pad electrically connecting the first connection electrode to the first emitter;
a second pad electrically connecting the second connection electrode to the second emitter;
a third pad electrically connecting the third connection electrode to the third emitter;
a fourth pad electrically connecting the fourth connection electrode to the third emitter;
a transparent layer disposed on the first emitter, the second emitter, and the third emitter; and
bonding metal layers disposed on upper surfaces of the first, second, third, and fourth connection electrodes, respectively, wherein the bonding metal layers are bonded to the circuit board,
wherein the first emitter, the second emitter, and the third emitter include layers including a Gallium material, and
wherein a first region between the first emitter and the second emitter and a second region between the second emitter and the third emitter include a material having a relatively low refractive index compared to that of the first emitter, the second emitter, and the third emitter.
2 . The display apparatus of claim 1 , further comprising a light absorbing layer covering upper regions of the first emitter, the second emitter, and the third emitter and a region between the first emitter, the second emitter, and the third emitter.
3 . The display apparatus of claim 2 , wherein the light absorbing layer includes at least one of PDMA and black epoxy molding compound (EMC).
4 . The display apparatus of claim 2 , wherein the light absorbing layer contacts a lower surface of the transparent layer.
5 . The display apparatus of claim 2 , further comprising an adhesive layer disposed between the light absorbing layer and the first emitter, the second emitter, and the third emitter.
6 . The display apparatus of claim 2 , wherein the light absorbing layer contacts the third emitter.
7 . The display apparatus of claim 1 , wherein each of the first, second, third, and fourth connection electrodes includes a groove on an upper surface thereof, respectively, and
the bonding metal layers cover the grooves of the first, second, third, and fourth connection electrodes, respectively.
8 . The display apparatus of claim 7 , wherein the first, second, third, and fourth connection electrodes include Cu, and the bonding metal layers include Au.
9 . The display apparatus of claim 1 , wherein the first, second, third, and fourth connection electrodes are located within lower regions of the first, second, and third emitters.
10 . The display apparatus of claim 1 , wherein each of the first, second, third, and fourth pads extends outward from a lower region of the third emitter, and
the first, second, third, and fourth connection electrodes are connected to the first, second, third, and fourth pads at locations spaced apart from the lower region of the third emitter in a lateral direction.
11 . The display apparatus of claim 1 , wherein each of the first, second, and third emitters includes a first conductivity type semiconductor layer and a second conductivity type semiconductor layer,
the first, second, and third connection electrodes are electrically connected to the second conductivity type semiconductor layers of the first, second, and third emitters, respectively, and
the fourth connection electrode is electrically connected to the first conductivity type semiconductor layers of the first, second, and third emitters.
12 . The display apparatus of claim 11 , further comprising a first upper contact electrode in ohmic contact with the first conductivity type semiconductor layer of the first emitter, wherein the first conductivity type semiconductor layer of the first emitter has a recessed region, and the first upper contact electrode is disposed in the recessed region.
13 . A display apparatus, comprising:
a circuit board;
a first emitter, a second emitter, and a third emitter mounted on the circuit board;
a first connection electrode electrically connected to the first emitter,
a second connection electrode electrically connected to the first emitter;
a third connection electrode electrically connected to the second emitter;
a fourth connection electrode electrically connected to the third emitter;
a first pad electrically connecting the first connection electrode to the first emitter;
a second pad electrically connecting the second connection electrode to the first emitter;
a third pad electrically connecting the third connection electrode to the second emitter;
a fourth pad electrically connecting the fourth connection electrode to the third emitter;
a transparent layer disposed on the first emitter, the second emitter, and the third emitter; and
bonding metal layers disposed on upper surfaces of the first, second, third, and fourth connection electrodes, respectively, wherein the bonding metal layers are bonded to the circuit board,
wherein the first emitter, the second emitter, and the third emitter include layers including a Gallium material, and
wherein a first region between the first emitter and the second emitter and a second region between the second emitter and the third emitter include a material having a relatively low refractive index compared to that of the first emitter, the second emitter, and the third emitter.
14 . The display apparatus of claim 13 , further comprising a light absorbing layer covering upper regions of the first emitter, the second emitter, and the third emitter and a region between the first emitter, the second emitter, and the third emitter.
15 . The display apparatus of claim 14 , wherein the light absorbing layer includes at least one of PDMA and black epoxy molding compound (EMC).
16 . The display apparatus of claim 14 , wherein the light absorbing layer contacts a lower surface of the transparent layer.
17 . The display apparatus of claim 14 , further comprising an adhesive layer disposed between the light absorbing layer and the first emitter, the second emitter, and the third emitter.
18 . The display apparatus of claim 14 , wherein the light absorbing layer contacts the third emitter.
19 . A display apparatus, comprising:
a circuit board;
a first emitter, a second emitter, and a third emitter mounted on the circuit board;
a first connection electrode electrically connected to the first emitter;
a second connection electrode electrically connected to the second emitter;
a third connection electrode electrically connected to the third emitter;
a fourth connection electrode electrically connected to the third emitter;
a first pad electrically connecting the first connection electrode to the first emitter;
a second pad electrically connecting the second connection electrode to the second emitter;
a third pad electrically connecting the third connection electrode to the third emitter;
a fourth pad electrically connecting the fourth connection electrode to the third emitter;
a transparent layer disposed on the first emitter, the second emitter, and the third emitter; and
bonding metal layers disposed on upper surfaces of the first, second, third, and fourth connection electrodes, respectively, wherein the bonding metal layers are bonded to the circuit board,
wherein a first region between the first emitter and the second emitter and a second region between the second emitter and the third emitter include a material that is configured to transmit light from the first emitter, the second emitter, and the third emitter.