Display device
The present application relates to a display device. The present application can provide a display device in which reflection of external light is reduced to improve a contrast ratio. Such a display device can be applied to not only OLED, a self-luminous display device, but also various display devices including LCD, a non-self-luminous display device, and the like, and can be also implemented as a flexible display device.
1. A display device comprising a display panel, a pressure-sensitive adhesive layer, and a surface treatment layer, and having a reflectance (R C ) calculated by Equation 1 below of 10% or less,
wherein the pressure-sensitive adhesive layer comprises a pressure-sensitive adhesive resin and a dye or pigment:
R
C
=
R
S
+
(
1
-
Rs
100
)
×
(
R
P
-
4
)
×
(
T
100
)
2
[
Equation
1
]
wherein, R S is the reflectance (%) of the surface treatment layer for light having a wavelength of 550 nm, R P is the reflectance (%) of the display panel for light having a wavelength of 550 nm, and T is the total transmittance (%) of the pressure-sensitive adhesive layer and the surface treatment layer for light having a wavelength of 550 nm.
2. The display device according to claim 1 , satisfying Equation 2 below:
(
R
M
-
R
C
)
R
M
×
100
≤
3
[
Equation
2
]
wherein, R M is the reflectance (%) of the display panel equipped with the pressure-sensitive adhesive layer and the surface treatment layer measured for light having a wavelength of 550 nm, and R C is a reflectance R C calculated by Equation 1.
3. The display device according to claim 1 , wherein the display panel comprises a self-luminous display panel or a non-self-luminous display panel.
4. The display device according to claim 1 , wherein the reflectance R P of the display panel is 5% to 20%.
5. The display device according to claim 1 , wherein the display panel is equipped with an antireflection layer on a non-pixel region comprising a thin film transistor and a wiring portion comprising a gate line and a data line.
6. The display device according to claim 5 , wherein the antireflection layer comprises a metal oxide, a metal nitride or a metal oxynitride derived from one or two or more metals selected from the group consisting of Cu, Al, Mo, Ti, Ag, Ni, Mn, Au, Cr, and Co.
7. The display device according to claim 5 , wherein the thickness of the antireflection layer is 10 nm to 100 nm.
8. The display device according to claim 1 , wherein the pressure-sensitive adhesive layer and the surface treatment layer are sequentially provided on the visual side of the display panel.
9. The display device according to claim 1 , wherein the total transmittance T of the pressure-sensitive adhesive layer and the surface treatment layer is 30% to 80%.
10. The display device according to claim 1 , wherein the pressure-sensitive adhesive resin comprises a styrenic resin or elastomer, a polyolefin resin or elastomer, a polyoxyalkylene resin or elastomer, a polyester resin or elastomer, a polyvinyl chloride resin or elastomer, a polycarbonate resin or elastomer, a polyphenylene sulfide resin or elastomer, a mixture of hydrocarbons, a polyamide resin or elastomer, an acrylate resin or elastomer, an epoxy resin or elastomer, a silicone resin or elastomer, a fluororesin or elastomer, or a mixture thereof.
11. The display device according to claim 1 , wherein the dye or pigment is a mixture of three or more dyes or pigments having different maximum absorption wavelength bands from one another and has a standard deviation of the total transmittance of the pressure-sensitive adhesive layer and the surface treatment layer at a wavelength of 400 nm to 700 nm of 5 or less.
12. The display device according to claim 1 , wherein the pressure-sensitive adhesive layer comprises 0.1 to 3 parts by weight of a dye or pigment relative to 100 parts by weight of the pressure-sensitive adhesive resin.
13. The display device according to claim 1 , wherein the pressure-sensitive adhesive layer further comprises an antistatic agent.
14. The display device according to claim 1 , wherein the reflectance R S of the surface treatment layer is 0.5% to 2%.
15. The display device according to claim 1 , wherein the surface treatment layer comprises an antireflection layer or an anti-glare layer.
16. The display device according to claim 1 , wherein the surface treatment layer comprises a low refractive index layer having a refractive index of 1.2 to 1.4 for a wavelength of 550 nm.
17. The display device according to claim 16 , wherein the low refractive index layer comprises a fluorine-based acrylate and a photo-curable acrylate containing hollow silica.
18. The display device according to claim 16 , wherein the surface treatment layer further comprises a hard coating layer provided on one surface of the low refractive index layer.