Display device and tiling display device
A display device including a display panel, and an anti-reflection layer on the display panel is provided. The anti-reflection layer includes a plurality of inorganic layers, the plurality of inorganic layers including a plurality of first inorganic layers having a first refractive index, and each including a silicon oxynitride (SiON), and a plurality of second inorganic layers having a second refractive index which is higher than the first refractive index, and each including a silicon oxynitride. Accordingly, it is possible to form an anti-reflection layer structure having low reflectance and high capping properties while being formed through a simple process, so that the display device may have improved durability and visibility.
1 . A display device comprising:
a display panel; and
an anti-reflection layer on the display panel, the anti-reflection layer comprising a plurality of inorganic layers comprising:
a plurality of first inorganic layers having a first refractive index, and each comprising a silicon oxynitride (SiON); and
a plurality of second inorganic layers having a second refractive index which is higher than the first refractive index, and each comprising a silicon oxynitride,
wherein one of the plurality of first inorganic layers is closest to the display panel from among the plurality of first inorganic layers and the plurality of second inorganic layers.
2 . The display device of claim 1 , wherein:
the first refractive index is about 1.50 to about 1.70 at a wavelength of about 550 nm; and
the second refractive index is about 1.70 to about 1.90 at the wavelength of about 550 nm.
3 . The display device of claim 1 , wherein the plurality of first inorganic layers and the plurality of second inorganic layers are alternately stacked.
4 . The display device of claim 3 , wherein:
the plurality of first inorganic layers comprise a 1 - 1 inorganic layer and a 1 - 2 inorganic layer; and
the plurality of second inorganic layers comprise a 2 - 1 inorganic layer and a 2 - 2 inorganic layer,
wherein the 1 - 1 inorganic layer, the 2 - 1 inorganic layer, the 1 - 2 inorganic layer, and the 2 - 2 inorganic layer are sequentially stacked.
5 . The display device of claim 1 , wherein a thickness of each of the plurality of first inorganic layers and the plurality of second inorganic layers is about 10 nm to about 150 nm.
6 . The display device of claim 1 , wherein when an amount of oxygen with respect to a total amount of elements in the plurality of first inorganic layers is defined as a first oxygen content, and an amount of oxygen with respect to a total amount of elements in the plurality of second inorganic layers is defined as a second oxygen content, the first oxygen content is greater than the second oxygen content.
7 . The display device of claim 1 , wherein when an amount of nitrogen with respect to a total amount of elements in the plurality of first inorganic layers is defined as a first nitrogen content, and an amount of nitrogen with respect to a total amount of elements in the plurality of second inorganic layers is defined as a second nitrogen content, the first nitrogen content is less than the second nitrogen content.
8 . The display device of claim 1 , wherein:
each of the plurality of first inorganic layers comprises about 23 at % to about 26 at % of oxygen, about 31 at % to about 34 at % of nitrogen, and about 41 at % to about 44 at % of silicon with respect to a total amount of each of the plurality of first inorganic layers; and
each of the plurality of second inorganic layers comprises about 20 at % to about 23 at % of oxygen, about 35 at % to about 38 at % of nitrogen, and about 39 at % to about 42 at % of silicon with respect to a total amount of each of the plurality of second inorganic layers.
9 . The display device of claim 1 , further comprising an optical layer between the display panel and the anti-reflection layer,
wherein the optical layer comprises:
a light control layer on the display panel; and
a color filter layer between the light control layer and the anti-reflection layer.
10 . The display device of claim 9 , wherein the display panel comprises a plurality of light emitting elements generating a first light, and wherein the light control layer comprises:
a first light control unit configured to transmit the first light;
a second light control unit configured to convert the first light into a second light having a different wavelength from the first light; and
a third light control unit configured to convert the first light into a third light having a different wavelength from the first light and the second light.
11 . The display device of claim 9 , wherein the optical layer further comprises an overcoat layer on the color filter layer, wherein the anti-reflection layer is in contact with an upper surface of the overcoat layer.
12 . The display device of claim 11 , wherein:
a refractive index of the overcoat layer is about 1.45 to about 1.53; and
a thickness of the overcoat layer is about 3 μm to about 10 μm.
13 . The display device of claim 1 , wherein the anti-reflection layer further comprises a low refractive layer on the plurality of inorganic layers, wherein an upper surface of the low refractive layer defines an outermost periphery surface of the anti-reflection layer.
14 . The display device of claim 13 , wherein a refractive index of the low refractive layer is about 1.3 to less than about 1.5.
15 . The display device of claim 1 , wherein reflectance on an upper surface of the anti-reflection layer is about 2% or less.
16 . A display device comprising:
a display panel; and
an anti-reflection layer on the display panel, the anti-reflection layer comprising a plurality of inorganic layers comprising:
a plurality of first inorganic layers, each comprising a silicon oxynitride (SiON); and
a plurality of second inorganic layers, each comprising a silicon oxynitride,
wherein, when an amount of oxygen with respect to a total amount of elements in the plurality of first inorganic layers is defined as a first oxygen content, and an amount of oxygen with respect to a total amount of elements in the plurality of second inorganic layers is defined as a second oxygen content, the first oxygen content is greater than the second oxygen content, and
wherein one of the plurality of first inorganic layers is closest to the display panel from among the plurality of first inorganic layers and the plurality of second inorganic layers.
17 . The display device of claim 16 , wherein when an amount of nitrogen with respect to the total amount of elements in the plurality of first inorganic layers is defined as a first nitrogen content, and an amount of nitrogen with respect to the total amount of elements in the plurality of second inorganic layers is defined as a second nitrogen content, the first nitrogen content is less than the second nitrogen content.
18 . The display device of claim 16 , further comprising an optical layer between the display panel and the anti-reflection layer, wherein the optical layer comprising:
a light control layer on the display panel;
a color filter layer between the light control layer and the anti-reflection layer; and
an overcoat layer on the color filter layer, wherein the anti-reflection layer is directly on the overcoat layer.
19 . A tiling display device comprising a plurality of unit display devices along at least one direction, wherein each of the plurality of unit display devices comprises:
a display panel; and
an anti-reflection layer on the display panel, the anti-reflection layer comprising a plurality of inorganic layers comprising:
a first inorganic layer having a first refractive index, and comprising a silicon oxynitride (SiON); and
a second inorganic layer being in contact with any one of an upper surface or a lower surface of the first inorganic layer, and having a second refractive index which is higher than the first refractive index, and comprising a silicon oxynitride,
wherein the first inorganic layer is closest to the display panel relative to the second inorganic layer.
20 . The tiling display device of claim 19 , wherein a side surface of the anti-reflection layer and a side surface of the display panel define one aligned side surface.