Display device having light emitting stacked structure
A display device includes a plurality of pixel tiles spaced apart from each other, each of the pixel tiles including a substrate and a plurality of light emitting stacked structures disposed on the substrate, in which a distance between two adjacent light emitting stacked structures in the same pixel tile is substantially equal to a shortest distance between two adjacent light emitting stacked structures of different pixel tiles.
1. A display device comprising:
a plurality of pixel tiles spaced apart from each other, each of the pixel tiles including:
a substrate; and
a plurality of light emitting stacked structures disposed on the substrate, each of the light emitting stacked structures comprising a plurality of epitaxial sub-units sequentially disposed one over another to have overlapping light emitting areas, and each of the plurality of epitaxial sub-units being configured to to emit different colored light,
wherein a distance between two adjacent light emitting stacked structures in the same pixel tile is substantially equal to a shortest distance between two adjacent light emitting stacked structures of different pixel tiles.
2. The display device of claim 1 , wherein each of the pixel tiles has substantially the same shape.
3. The display device of claim 2 , wherein:
the substrate has a substantially polygonal shape; and
the light emitting stacked structures are disposed at vertices of the polygonal shape.
4. The display device of claim 3 , wherein:
the substrate has substantially a triangular shape; and
the light emitting stacked structures are disposed at vertices of the triangular shape.
5. The display device of claim 1 , wherein the light emitting stacked structures are arranged substantially regularly along at least one of a first direction and a second direction intersecting the first direction.
6. The display device of claim 1 , wherein the pixel tiles have different shapes from each other.
7. The display device of claim 1 , wherein the substrate comprises a silicon substrate.
8. The display device of claim 7 , wherein the substrate includes a penetrating electrode that penetrates upper and lower surfaces of the substrate and is electrically connected to the light emitting stacked structures.
9. The display device of claim 1 , wherein
at least one of the epitaxial sub-units has an area different from that of another one of the epitaxial sub-units.
10. The display device of claim 9 , wherein the area of the epitaxial sub-units gradually decreases along a first direction.
11. The display device of claim 10 , wherein an upper epitaxial sub-unit completely overlaps a lower epitaxial sub-unit.
12. The display device of claim 9 , wherein:
light emitted from each epitaxial sub-units has a different energy band; and
the energy band of light gradually increases along a first direction.
13. The display device of claim 9 , wherein each of the epitaxial sub-units is independently drivable.
14. The display device of claim 9 , wherein light emitted from a lower epitaxial sub-unit is configured to be emitted to the outside of the display device through an epitaxial sub-unit disposed thereon.
15. The display device of claim 14 , wherein an upper epitaxial stack is configured to transmit about 80% or more of light emitted from a lower epitaxial stack.
16. The display device of claim 9 , wherein the epitaxial sub-units comprise:
a first epitaxial stack configured to emit a first color light;
a second epitaxial stack disposed on the first epitaxial stack and configured to emit a second color light having a wavelength band different from the first color light; and
a third epitaxial stack disposed on the second epitaxial stack and configured to emit a third color light having a wavelength band different from the first and second color lights.
17. The display device of claim 16 , wherein the first, second, and third color lights are red light, green light, and blue light, respectively.
18. The display device of claim 16 , wherein each of the first, second, and third epitaxial stacks comprises:
a p-type semiconductor layer;
an active layer disposed on the p-type semiconductor layer; and
an n-type semiconductor layer disposed on the active layer.
19. The display device of claim 1 , wherein the display device is configured to be driven in at least one of a passive matrix manner and an active matrix manner.
20. The display device of claim 1 , wherein at least one of the light emitting stacked structures comprises a micro LED having a surface area less than about 10,000 square μm.