Window and display device including the same
Provided are a window and a display device including the window. The window may include a base layer having a refractive index of about of 1.6 to about 2.0, a first layer on an upper side of the base layer and having a refractive index lower than that of the base layer, a second layer on an upper side of the first layer, a middle adhesive layer between the first layer and the second layer, and a print layer on a lower side of the base layer.
1. A window comprising:
a base layer including a transmission region and a bezel region adjacent to the transmission region, the base layer having a refractive index of about 1.6 to about 2.0;
a first layer disposed on an upper side of the base layer, the first layer having a refractive index lower than the refractive index of the base layer;
a second layer disposed on an upper side of the first layer;
a middle adhesive layer disposed between the first layer and the second layer; and
a print layer disposed on a lower side of the base layer,
wherein:
the first layer, the second layer, and the middle adhesive layer each overlap the transmission region and the bezel region; and
the print layer overlaps the bezel region.
2. The window of claim 1 , wherein the refractive index of the base layer is about 1.8 to about 2.0.
3. The window of claim 1 , wherein:
the refractive index of the first layer is about 1.3 to about 1.5; and
a refractive index of the middle adhesive layer is about 1.3 to about 1.6.
4. The window of claim 1 , wherein the first layer and the middle adhesive layer each comprise at least one of silicon dioxide (SiO 2 ), fused silica, fluorine-doped fused silica, magnesium fluoride (MgF 2 ), calcium fluoride (CaF 2 ), aluminum fluoride (AlF 3 ), yttrium fluoride (YF 3 ), ytterbium fluoride (YbF 3 ), yttrium oxyfluoride (YOF), aluminum oxide (Al 2 O 3 ), magnesium oxide (MgO), or Si x O y Mg z Al u N v , wherein in the Si x O y Mg z Al u N v , each of x, y, z, u, and v is in a range from 0 to 1 and a sum X+y+z+u+v is equal to or less than 1.
5. The window of claim 4 , wherein the first layer comprises the magnesium fluoride (MgF 2 ) alone or in a solid solution in which the magnesium fluoride (MgF 2 ) is mixed with the yttrium oxyfluoride (YOF) and the magnesium oxide (MgO).
6. The window of claim 4 , wherein the middle adhesive layer comprises a solid solution in which the aluminum oxide and the silicon dioxide are mixed.
7. The window of claim 1 , wherein the base layer comprises a glass substrate or a polymer film.
8. The window of claim 1 , wherein the second layer comprises a fluorine-based compound.
9. The window of claim 1 , wherein Specular Component Included (SCI) reflectance on an upper surface of the second layer is about 0.5% or less.
10. The window of claim 1 , wherein a thickness of the print layer is about 5 μm to about 20 μm.
11. The window of claim 10 , wherein the print layer comprises:
a first print layer on a lower surface of the base layer; and
a second print layer on a lower surface of the first print layer,
wherein the first print layer and the second print layer each include at least one of an acrylic urethane-based compound, an epoxy-based compound, a polyester-based compound, or an epoxy ester-based compound.
12. The window of claim 11 , wherein:
the first print layer comprises the acrylic urethane-based compound or the polyester-based compound; and
the second print layer comprises the epoxy-based compound or the epoxy ester-based compound.
13. The window of claim 11 , wherein:
a thickness of the first print layer is about 3 μm to about 8 μm; and
a thickness of the second print layer is about 5 μm to about 10 μm.
14. The window of claim 11 , wherein the print layer further comprises a third print layer disposed in a lower portion of the second print layer, wherein the third print layer includes the epoxy ester-based compound.
15. The window of claim 14 , wherein:
a thickness of the first print layer is about 2 μm to about 5 μm; and
a thickness of the second print layer and a thickness of the third print layer are each about 3 μm to about 5 μm.
16. The window of claim 1 , wherein:
a thickness of the first layer is about 2 nm to about 40 nm;
a thickness of the second layer is about 2 nm to about 40 nm; and
a thickness of the middle adhesive layer is about 5 nm to about 30 nm.
17. A display device comprising:
a display module including a base substrate having a display region and a non-display region adjacent to the display region, a circuit layer disposed on the base substrate, and a display element layer disposed on the circuit layer and having a light control layer; and
a window disposed on the display module, wherein the window includes:
a base layer having a refractive index of about of 1.6 to about 2.0;
a first layer disposed on the base layer, the first layer having a refractive index lower than the refractive index of the base layer;
a second layer disposed on the first layer;
a middle adhesive layer disposed between the first layer and the second layer; and
a print layer disposed on a lower side of the base layer.
18. The display device of claim 17 , wherein the light control layer comprises:
a partition layer in which a plurality of light emitting elements and a plurality of partition openings respectively overlapping the plurality of light emitting elements are defined; and
a plurality of color filters disposed on the plurality of partition openings.
19. The display device of claim 17 , wherein the print layer overlaps the non-display region and comprises a plurality of layers.
20. The display device of claim 17 , wherein at a wavelength of about 550 nm, the SCI reflectance on an uppermost surface of the window is about 0.5% or less.