Optical film having multilayered structure and display device comprising same

Patent metadata

Field	Value
Publication number	US-2024255682-A1
Application number	US-202218577329-A
Country	US
Kind code	A1
Filing date	Jul 13, 2022
Priority date	Sep 29, 2021
Publication date	Aug 1, 2024
Grant date	—

Abstract

The present invention provides an optical film and a display device comprising same, wherein the optical film comprises a light transmitting substrate and a primer layer and has a yellowness (Y) of 5.0 or less before a light fastness test, a yellowness difference (ΔY.I) of 5.5 or less, and excellent total light transmittance.

First claim

1 . An optical film comprising a light-transmitting substrate and a primer layer,
the optical film having a yellowness index before a light resistance test (Y 0 ) of 5.0 or less and a yellowness index difference (ΔY.I) of 5.5 or less, wherein the yellowness index difference (ΔY.I) is a difference (Y 1 −Y 0 ) between a yellowness index after the light resistance test (Y 1 ) and the yellowness index before the light resistance test (Y 0 ), and the light resistance test is performed under UV conditions [0.8 W/m 2 , at 420 nm (863.4 KJ/m 2 , 30° C./30RH % chamber, 55° C. black panel×300 hr)].

2 . The optical film according to claim 1 , wherein the yellowness index difference (ΔY.I), a color difference before and after the light resistance test (ΔE ab ), and a total light transmittance difference (ΔT) of the optical film satisfy the following Equation 1:

(

Δ
⁢

Y
·
I

-

Δ
⁢

E
ab

)

/

[

(

Δ
⁢
T

)

×

(

Δ
⁢

E
ab

+

❘
"\[LeftBracketingBar]"

Δ
⁢
T

❘
"\[RightBracketingBar]"

)

]

≥
1

[

Equation
⁢

1

]

wherein ΔE ab is a difference between color before the light resistance test and color after the light resistance test; and
ΔT is a difference (T 1 −T 0 ) between total light transmittance after the light resistance test (T 1 ) and total light transmittance before the light resistance test (T 0 ), with the proviso that, when ΔT is 0 or less, Equation 1 is calculated with ΔT as 0.1, and even when ΔT in |ΔT| is 0 or less, Equation 1 is calculated with the original value of ΔT, not 0.1.

3 . The optical film according to claim 1 , wherein the primer layer comprises:
a curable resin; an ultraviolet absorber; and a pigment, wherein the curable resin comprises at least one selected from an acryl-based resin, a urethane-based resin, and a siloxane-based resin.

4 . The optical film according to claim 3 , wherein the curable resin comprises a siloxane-based resin prepared by polymerizing a monomer including an alkoxysilane represented by the following Formula 1 and an alkoxysilane represented by the following Formula 2:

wherein R 1 is a C1-C10 linear, branched or cyclic alkyl group substituted with epoxy or acryl;
R 2 is a C1-C8 linear, branched or cyclic alkyl group; and
n is an integer of 1 to 3,

wherein R 3 is a C1-C4 linear or branched alkyl group.

5 . The optical film according to claim 3 , wherein the primer layer comprises:
0.01 to 5.00 parts by weight of the ultraviolet absorber based on 100 parts by weight of the curable resin; and 0.01 to 5.00 parts by weight of the pigment based on 100 parts by weight of the curable resin.

6 . The optical film according to claim 3 , wherein the ultraviolet absorber and the pigment are present at a weight ratio of 50:1 to 100:1 (ultraviolet absorber:pigment).

7 . The optical film according to claim 3 , wherein the ultraviolet absorber comprises a hydroxyphenyl triazine-based compound.

8 . The optical film according to claim 3 , wherein the pigment comprises a copper-phthalocyanine-based compound.

9 . The optical film according to claim 3 , wherein the primer layer further comprises an additive.

10 . The optical film according to claim 9 , wherein the additive comprises a polyether siloxane copolymer.

11 . The optical film according to claim 2 , wherein the total light transmittance before the light resistance test (T 0 ) is 88.0 or more.

12 . The optical film according to claim 1 , wherein the primer layer has a thickness of 0.1 to 10 μm.

13 . The optical film according to claim 1 , further comprising a hard coating layer on the primer layer,
wherein the light-transmitting substrate, the primer layer, and the hard coating layer are stacked in this order.

14 . The optical film according to claim 13 , wherein the hard coating layer comprises at least one of a siloxane-based resin, an acryl-based resin, a urethane-based resin, and an epoxy-based resin.

15 . A display device comprising:
a display panel; and the optical film according to claim 1 disposed on the display panel.

Assignees

• Kolon Inc

Inventors

• An Byung-Joon
• Ahn Sang-Hyun

Classifications

• H10K59/87

  Passivation; Containers; Encapsulations · CPC title

• C08G77/04

  Polysiloxanes · CPC title

• H10K50/844

  Encapsulations · CPC title

• C08L83/12

  containing polyether sequences · CPC title

• C08K5/0091

  Complexes with metal-heteroatom-bonds · CPC title