Display device including a wavelength control layer
A display device includes pixels; a substrate; a first electrode and a second electrode disposed in each of the pixels and spaced apart from each other on a substrate; light-emitting elements disposed between the first electrode and the second electrode; a wavelength control layer disposed on the light-emitting elements; and a light-transmitting layer disposed between the light-emitting elements and the wavelength control layer, wherein the light-transmitting layer disposed in each of the pixels is spaced apart from the light-transmitting layer disposed in an adjacent one of the plurality of pixels.
1. A display device comprising:
a plurality of pixels;
a first electrode and a second electrode disposed in each of the plurality of pixels and spaced apart from each other on a substrate;
a plurality of light-emitting elements disposed between the first electrode and the second electrode;
a wavelength control layer disposed on the plurality of light-emitting elements;
a light-transmitting layer disposed between the plurality of light-emitting elements and the wavelength control layer; and
a bank disposed along a boundary of each of the plurality of pixels on the substrate and extending higher than the light-transmitting layer in a direction perpendicular to the substrate,
wherein the light-transmitting layer disposed in each of the plurality of pixels is completely separated from the light-transmitting layer disposed in an adjacent one of the plurality of pixels by the bank-,
wherein the bank includes a lower bank and an upper bank disposed on and overlapping the lower bank in a plan view, and
a size of the upper bank is greater than a size of the lower bank in a plan view.
2. The display device of claim 1 , wherein
the bank exposes a part of each of the first electrode and the second electrode, and
the plurality of light-emitting elements are disposed between the first electrode and the second electrode exposed by the bank.
3. The display device of claim 2 , wherein at least a part of a space defined by the bank is filled with the light-transmitting layer.
4. The display device of claim 3 , wherein the wavelength control layer is disposed in the space defined by the bank.
5. The display device of claim 2 , wherein
the light-transmitting layer overlaps the plurality of light-emitting elements and the wavelength control layer in a plan view, and
the light-transmitting layer contacts a side surface of the bank.
6. The display device of claim 2 , wherein
the light-transmitting layer is disposed in a space defined by the lower bank, and
the wavelength control layer is disposed in a space defined by the upper bank.
7. The display device of claim 6 , wherein the light-transmitting layer is disposed between the lower bank and the upper bank in a plan view.
8. The display device of claim 6 , wherein the light-transmitting layer is disposed between the plurality of light-emitting elements and the wavelength control layer.
9. The display device of claim 1 , wherein
the plurality of pixels comprises:
a first pixel displaying a first color; and
a second pixel displaying a second color, and
the wavelength control layer comprises:
a first wavelength conversion pattern disposed in the first pixel and converting light of a third color into light of the first color; and
a second wavelength conversion pattern disposed in the second pixel and converting the light of the third color into the light of the second color.
10. The display device of claim 1 , further comprising:
contact electrodes disposed on the plurality of light-emitting elements,
wherein the contact electrodes comprise:
a first contact electrode electrically connecting the first electrode with first ends of the plurality of light-emitting elements; and
a second contact electrode electrically connecting the second electrode with second ends of the plurality of light-emitting elements.
11. The display device of claim 10 , wherein the light-transmitting layer is disposed on the contact electrodes.
12. The display device of claim 1 , further comprising:
a first capping layer disposed between the wavelength control layer and the light-transmitting layer.
13. The display device of claim 12 , further comprising:
a second capping layer disposed on the wavelength control layer.
14. A display device comprising:
a plurality of pixels;
a first electrode and a second electrode disposed in each of the plurality of pixels and spaced apart from each other on a substrate;
a plurality of light-emitting elements disposed between the first electrode and the second electrode;
a wavelength control layer disposed on the plurality of light-emitting elements;
a light-transmitting layer disposed between the plurality of light-emitting elements and the wavelength control layer; and
a bank disposed along a boundary of each of the plurality of pixels on the substrate and extending higher than the light-transmitting layer in a direction perpendicular to the substrate,
wherein
the plurality of pixels comprises:
a first pixel displaying a first color; and
a second pixel displaying a second color,
the wavelength control layer comprises:
a first wavelength conversion pattern that is disposed in the first pixel and converts light of a third color into light of the first color; and
a second wavelength conversion pattern that is disposed in the second pixel and converts the light of the third color into light of the second color, and
a refractive index of the light-transmitting layer is smaller than a refractive index of each of the first wavelength conversion pattern and the second wavelength conversion pattern, and
the light-transmitting layer disposed in each of the plurality of pixels is completely separated from the light-transmitting layer disposed in an adjacent one of the plurality of pixels by the bank,
wherein the bank includes a lower bank and an upper bank disposed on and overlapping the lower bank in a plan view, and
a size of the upper bank is greater than a size of the lower bank in a plan view.
15. The display device of claim 14 , wherein the refractive index of the light-transmitting layer is in a range of about 1.2 to about 1.5.
16. The display device of claim 14 , wherein
the bank exposes a part of each of the first electrode and the second electrode,
the plurality of light-emitting elements are disposed between the first electrode and the second electrode exposed by the bank, and
a space defined by the bank is at least partially filled with the light-transmitting layer.
17. The display device of claim 16 , wherein
the light-transmitting layer is disposed in a space defined by the lower bank, and
the wavelength control layer is disposed in a space defined by the upper bank.
18. The display device of claim 17 , wherein the light-transmitting layer is disposed between the lower bank and the upper bank in a plan view.
19. The display device of claim 17 , wherein the light-transmitting layer is disposed between the plurality of light-emitting elements and the wavelength control layer.