DISPLAY DEVICE
The present disclosure relates to an optical laminate or a reddening-resistant layer. The present disclosure can provide an optical laminate that does not cause a so-called reddening phenomenon even when driven or maintained under extremely harsh conditions (e.g., very high temperature conditions), or a reddening-resistant layer applied thereto.
1 . A display device, comprising:
a cover glass and
an optical laminate attached to the cover glass,
wherein the optical laminate comprises an optical functional layer and a reddening-resistant layer formed on at least one side of the optical function layer.
2 . The display device according to claim 1 , wherein the optical functional layer is an iodine-based polarizing layer.
3 . The display device according to claim 1 , wherein the reddening-resistant layer satisfies Equation 4:
H L ≤0.9 ×H P [Equation 4]
wherein H L is a thermal diffusivity of a laminate of a polymer film and the reddening-resistant layer formed on one side of the polymer film, and H P is the thermal diffusivity of the polymer film.
4 . The display device according to claim 1 , wherein the reddening-resistant layer comprises a surface having a surface area ratio of 0.02 or more as measured by an atomic force microscope.
5 . The display device according to claim 1 , wherein the reddening-resistant layer is a void-containing layer or a layer comprising the void-containing layer.
6 . The display device according to claim 5 , wherein the reddening-resistant layer exhibits at least one peak within a scattering vector range of 0.06 to 0.209 nm −1 in a log value graph of scattering intensity of small angle X-ray scattering.
7 . The display device according to claim 5 , wherein an A value satisfying Equation 6 of the reddening-resistant layer is 1.5 or less, a B value satisfying Equation 6 of the reddening-resistant layer is from 0 to 0.01 and a C value satisfying Equation 6 of the reddening-resistant layer is from 0 to 0.001:
n (λ)= A+λ 2 /B+λ 4 /C [Equation 6]
wherein, n(λ) is the refractive index of the reddening-resistant layer at a wavelength of λ, and λ is any one wavelength in a range of 300 to 1800 nm.
8 . The display device according to claim 5 , wherein the void-containing layer comprises a binder and hollow particles.
9 . The display device according to claim 8 , wherein the binder comprises a polymer derived from a polyfunctional acrylate having 2 to 10 polymerizable functional groups.
10 . The display device according to claim 8 , wherein the hollow particles have a D10 particle diameter in a range from 25 to 50 nm, a D50 particle diameter in a range from 50 to 95 nm and a D90 particle diameter in a range from 100 nm to 200 nm in a weight cumulative curve of particle size distribution.
11 . The display device according to claim 8 , wherein the void-containing layer does not comprise solid particles.
12 . The display device according to claim 1 , wherein the reddening-resistant layer has a thickness of 200 nm or more.
13 . The display device according to claim 1 , wherein the reddening-resistant layer does not form a surface of an outermost layer in the optical laminate.
14 . The display device according to claim 1 , wherein the optical laminate further comprises an additional layer, and wherein the reddening-resistant layer is disposed between the additional layer and the optical functional layer.
15 . The display device according to claim 1 , wherein the distance between the reddening-resistant layer and the optical functional layer is 90 μm or less.