Display apparatus and method of manufacturing the same
A display apparatus and a method of manufacturing the same. The display apparatus includes a circuit board; and a plurality of pixels formed on the circuit board, wherein at least one of a blue light emitting diode chip, a red light emitting diode part, and a green light emitting diode chip is disposed in each of the pixels, and the blue light emitting diode chip, the red light emitting diode part and the green light emitting diode chip are covered by a coupling structure.
1. A display apparatus comprising:
a circuit board including a first electrode and a second electrode; and
a pixel disposed on the circuit board,
wherein the pixel includes a blue light emitting diode part, a red light emitting diode part, and a green light emitting diode part disposed in the pixel,
wherein each of the blue light emitting diode part, the red light emitting diode part, and the green light emitting diode part includes a light emitting diode chip and a coupling structure covering the light emitting diode chip,
wherein the second electrode of the circuit board is electrically contacted as a common electrode in each of the blue light emitting diode part, the red light emitting diode part, and the green light emitting diode part,
wherein the coupling structure covers at least a region of a lower surface of the light emitting diode chip,
wherein at least one of the blue light emitting diode part and the green light emitting diode part comprises:
a light emitting layer comprising a first conductivity type semiconductor layer, a second conductivity type semiconductor layer, and an active layer interposed between the first and second conductivity type semiconductor layers; and
a third electrode electrically connected to the first conductivity type semiconductor layer,
wherein at least one of the blue light emitting diode part and the green light emitting diode part further comprises a fourth electrode electrically connected to the second conductivity type semiconductor layer, the third and fourth electrodes being arranged in one direction of the light emitting layer,
wherein the third electrode is electrically connected to an exposed region of the first conductivity type semiconductor layer formed by partially removing the active layer and the second conductivity type semiconductor layer,
wherein at least one of the blue light emitting diode part and the green light emitting diode part further comprises:
an encapsulation layer covering at least a region of the third and fourth electrodes and the light emitting layer while insulating the third and fourth electrodes from each other;
a first bump electrically connected to the third electrode; and
a second bump electrically connected to the fourth electrode,
wherein the first and second bumps are electrically connected to the third and fourth electrodes through the encapsulation layer, respectively, and
wherein the first and second bumps laterally extend across a lower surface of the encapsulation layer.
2. The display apparatus according to claim 1 , wherein the red light emitting diode part comprises a red light emitting diode chip.
3. The display apparatus according to claim 1 , wherein the coupling structure comprises at least one of polydimethylsiloxane (PDMS), polyimide, poly(methyl methacrylate) (PMMA), a ceramic material, an epoxy resin, and a synthetic resin.