US 12,710,566 B2 · Optical film, display device, and composition for forming colored layer

Abstract

An optical film comprises: a transparent substrate having an ultraviolet blocking rate of 85% or more according to JIS L 1925; one or more functional layers formed on a first surface side of the transparent substrate; and a colored layer that is formed on a second surface side of the transparent substrate that is configured by one or more layers containing a colored material. The colored layer contains a first colorant that has a maximum absorption wavelength in a range of 470 nm or more and 530 nm or less, an absorption spectrum thereof having a half-width of 15 nm or more and 45 nm or less, and a second colorant that has a maximum absorption wavelength in a range of 560 nm or more and 620 nm or less, an absorption spectrum thereof having a half-width of 15 nm or more and 55 nm or less.

An optical film, comprising:

a transparent substrate having an ultra violet blocking rate of 85% or more, wherein the ultraviolet blocking rate ultraviolet blocking rate is calculated by subtracting an average transmittance in a wavelength range from 290 nm to 400 nm of the transparent substrate expressed in percent (%) from 100%;
one or more functional layers formed on a first surface side of the transparent substrate;
and
a colored layer that is formed on a second surface side of the transparent substrate that is configured by one or more layers containing a colored material;
wherein the colored layer contains
a first colorant that has a maximum absorption wavelength in a range of 470 nm or more and 530 nm or less, an absorption spectrum thereof having a halfwidth of 15 nm or more and 45 nm or less, and
a second colorant that has a maximum absorption wavelength in a range of 560 nm or more and 620 nm or less, an absorption spectrum thereof having a half-width of 15 nm or more and 55 nm or less,
at least one of the functional layer and the colored layer contains a black organic pigment, and
hue values a* and b* defined by equations (1) to (9) below are each in a range of −5 or more and +5 or less
[
Math
.
1
]

a
*
=
500
⁢
{
f
⁡
(
X
X
n
)
-
f
⁡
(
Y
Y
n
)
}
(
1
)
[
Math
.
2
]

b
*
=
200
⁢
{
f
⁡
(
Y
Y
n
)
-
f
⁡
(
Z
Z
n
)
}
(
2
)
[
Math
.
3
]

f
⁡
(
t
)
=
{
t
1
3
,
[
t
>
(
6
29
)
3
]
1
3
⁢
(
29
6
)
2
⁢
t
+
4
29
,
[
t
≤
(
6
29
)
3
]
(
3
)
[
Math
.
4
]

R
⁢
1
⁢
(
λ
)
[
%
]
=
(
100
-
R
⁢
2
⁢
(
λ
)
)
100
×
T
⁡
(
λ
)
100
×
T
⁡
(
λ
)
100
×
R
E
(
λ
)
(
4
)
[
Math
.
5
]

R
⁡
(
λ
)
[
%
]
=
R
⁢
1
⁢
(
λ
)
+
R
⁢
2
⁢
(
λ
)
(
5
)
[
Math
.
6
]

X
=
k
×
∫
380
780
P
D
⁢
65
(
λ
)
×
R
⁡
(
λ
)
×
x
_
(
λ
)
⁢
d
⁢
λ
(
6
)
[
Math
.
7
]

Y
=
k
×
∫
380
780
P
D
⁢
65
(
λ
)
×
R
⁡
(
λ
)
×
y
_
(
λ
)
⁢
d
⁢
λ
(
7
)
[
Math
.
8
]

Z
=
k
×
∫
380
780
P
D
⁢
65
(
λ
)
×
R
⁡
(
λ
)
×
z
_
(
λ
)
⁢
d
⁢
λ
(
8
)
[
Math
.
9
]

k
=
100
/
∫
380
780
P
D
⁢
65
(
λ
)
×
R
⁡
(
λ
)
×
y
_
(
λ
)
⁢
d
⁢
λ
(
9
)
wherein λ is a variable representing a wavelength, and t is a variable representing a ratio of X, Y, and Z with respect to Xn, Yn, and Zn, a* and b* calculated from equations (1) to (3) are calculated according to a calculation method in a CIE 1976 L*, a*, b* color space (CIELAB color space), In equations (1) and (2), Xn, Yn, and Zn are tristimulus values at a white point of a D65 light source, in equation (4), RE(λ) is a function representing a reflectance [%] at a completely diffuse reflection surface (100% at every wavelength), R2(λ) is a function representing a surface reflectance [%] at an outermost surface of the optical film on an opposite side to the colored layer, and T(λ) is a function representing a transmittance of the optical film, in equations (6) to (9), PD65(λ) is a D65 light source spectrum, x-bar(λ), y-bar(λ), and z-bar(λ) are CIE1931 color matching functions at 2° field of view, a definite integral in equations (6) to (9) can be calculated by an appropriate numerical integration, a wavelength interval when performing a numerical integration is, a 1 nm interval.

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Optical film, display device, and composition for forming colored layer

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Optical film, display device, and composition for forming colored layer

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Abstract

Claims14