LED display module, manufacturing method for LED display module and display device including LED display module
A display panel including an LED device and a method including: forming a plurality of light emitting diodes (LEDs); and forming a plurality of partition walls that divide light-emitting regions by each of the plurality of LEDs, wherein the forming the plurality of LEDs includes: etching a growth substrate to form a plurality of LEDs and forming a plurality of protrusions and a plurality of depressions on the growth substrate; and forming a reflector layer on a surface of the plurality of protrusions and a surface of the plurality of depressions, and wherein the forming the plurality of partition walls includes removing a part of the growth substrate so that the plurality of partition walls are formed based on the plurality of protrusions, and a space between the plurality of partition walls is formed based on the plurality of depressions.
1. A display module comprising:
a plurality of light-emitting diodes (LEDs);
a driving substrate;
a driving circuit on an upper portion of the driving substrate and configured to drive the plurality of LEDs;
a plurality of partition walls configured to divide light-emitting regions by each of the plurality of LEDs; and
reflective layers formed on both sides of each of the plurality of partition walls,
wherein each of the plurality of partition walls is formed to have a predetermined height so that wavelengths of light emitted from each of the plurality of LEDs do not overlap each other, and
wherein a width of each of the plurality of partition walls narrows as a height increases toward an upper portion.
2. The display module of claim 1 , wherein:
each of the plurality of partition walls is a part of a plurality of protrusions formed by etching of a growth substrate to form the plurality of LEDs; and
the plurality of protrusions is formed before a plurality of semiconductor layers included in the plurality of LEDs is formed on the growth substrate.
3. The display module of claim 2 , further comprising:
a color conversion layer at a space between the plurality of partition walls,
wherein the space between the plurality of partition walls is formed based on a plurality of depressions formed along with the plurality of protrusions on the growth substrate, and
wherein the color conversion layer comprises a quantum dot (QD) or phosphor.
4. The display module of claim 1 , further comprising:
a plurality of pixels in a matrix form,
wherein the plurality of pixels each comprise a red (R) sub pixel, a green (G) sub pixel, and a blue (B) sub pixel, and
wherein the R-sub pixel, the G-sub pixel, and the B-sub pixel each correspond to one LED device among the plurality of LEDs.
5. The display module of claim 1 , wherein each of the plurality of partition walls comprises silicon.
6. The display module of claim 1 , wherein the reflective layers each comprise at least one of aluminum (Al) and aluminum nitride (AlN).
7. The display module of claim 6 , wherein the reflective layers comprise:
a first reflective layer comprising aluminum;
a second reflective layer on the first reflective layer and comprising aluminum nitride; and
a third reflective layer on the second reflective layer and comprising aluminum.
8. The display module of claim 1 , wherein each of the plurality of LEDs is a micro LED device in a flip-chip type.
9. A method for manufacturing a display module, the method comprising:
forming a plurality of light emitting diodes (LEDs); and
forming a plurality of partition walls that divide light-emitting regions by each of the plurality of LEDs,
wherein the forming the plurality of LEDs comprises:
etching a growth substrate to form a plurality of LEDs and forming a plurality of protrusions and a plurality of depressions on the growth substrate; and
forming a reflector layer on a surface of the plurality of protrusions and a surface of the plurality of depressions, and
wherein the forming the plurality of partition walls comprises removing a part of the growth substrate so that the plurality of partition walls are formed based on the plurality of protrusions, and a space between the plurality of partition walls is formed based on the plurality of depressions.
10. The method of claim 9 , wherein the forming the plurality of LEDs further comprises:
growing an n-type semiconductor layer on the reflector layer formed on a top surface of the plurality of protrusions in a horizontal direction;
re-growing the n-type semiconductor layer grown in the horizontal direction;
forming a light-emitting layer and a p-type semiconductor layer on the regrown n-type semiconductor layer;
forming a region for dividing each of the plurality of LEDs and a region for disposing an n-type electrode by etching the n-type semiconductor layer, the light-emitting layer, and the p-type semiconductor layer; and
forming the n-type electrode electrically connected to the n-type semiconductor layer on a region to dispose the n-type electrode, and forming, on the p-type semiconductor, a p-type electrode electrically connected to the p-type semiconductor.
11. The method of claim 9 , wherein each of the plurality of partition walls are formed to have a predetermined height so that wavelengths of light emitted from each of the plurality of LEDs do not overlap each other.
12. The method of claim 9 , wherein a width of each of the plurality of partition walls narrows as a height approaches toward an upper portion.
13. The method of claim 9 , wherein each of the plurality of partition walls comprises silicon.
14. The method of claim 9 , wherein the reflector layer comprises at least one of aluminum (Al) and aluminum nitride (AlN).
15. The method of claim 9 , further comprising:
forming a color conversion layer at a space between the plurality of partition walls,
wherein the color conversion layer comprises a quantum dot (QD) or phosphor.
16. A display device comprising:
a plurality of display modules; and
a support plate configured to support the plurality of display modules,
wherein each of the plurality of display modules comprises:
a plurality of light-emitting diodes (LEDs);
a driving substrate;
a driving circuit on an upper portion of the driving substrate and configured to drive the plurality of LEDs;
a plurality of partition walls configured to divide light-emitting regions by each of the plurality of LEDs; and
reflective layers formed on both sides of each of the plurality of partition walls,
wherein each of the plurality of partition walls is a part of a plurality of protrusions formed by etching of a growth substrate to form the plurality of LEDs, and
wherein the plurality of protrusions is formed before a plurality of semiconductor layers included in the plurality of LEDs is formed on the growth substrate.
17. The display device of claim 16 , wherein:
the display module further comprises a plurality of pixels in a matrix form,
the plurality of pixels each comprise a red (R) sub pixel, a green (G) sub pixel, and a blue (B) sub pixel, and
the R-sub pixel, the G-sub pixel, and the B-sub pixel each correspond to one LED device among the plurality of LEDs.