DISPLAY DEVICE
The invention provides a display device in which the tint is difficult to observe in a case where white display is visually confirmed from a front direction, and the tint is also difficult to observe at any azimuthal angle in a case where white display is visually confirmed from an oblique direction. A display device of the invention includes, from a viewing side, an anisotropic light absorbing layer and a self light emitting display element which emits at least red light, green light, and blue light, the self light emitting display element has a microcavity structure, the anisotropic light absorbing layer is formed of a composition containing a dichroic substance and a liquid crystal compound, the dichroic substance has a maximum absorption wavelength of 400 to 500 nm, and the anisotropic light absorbing layer satisfies a requirement represented by Expression (1) and a requirement represented by Expression (2). 1.50< A max(60)/ A (0) Expression (1) 1.00≤ A max(60)/ A min(60)≤1.20 Expression (2)
1 . A display device comprising, from a viewing side:
an anisotropic light absorbing layer; and
a self light emitting display element which emits at least red light, green light, and blue light,
wherein the self light emitting display element has a microcavity structure,
the anisotropic light absorbing layer is formed of a composition containing a dichroic substance and a liquid crystal compound,
the dichroic substance has a maximum absorption wavelength of 400 to 500 nm, and
the anisotropic light absorbing layer satisfies a requirement represented by Expression (1) and a requirement represented by Expression (2),
1.50< A max(60)/ A (0) Expression (1)
1.00≤ A max(60)/ A min(60)≤1.20 Expression (2)
here, Amax (60) represents a highest absorbance in a case where an absorbance of the anisotropic light absorbing layer at the maximum absorption wavelength is measured at all azimuthal angles at a polar angle of 60° from a normal direction of the anisotropic light absorbing layer,
Amin (60) represents a lowest absorbance in a case where an absorbance of the anisotropic light absorbing layer at the maximum absorption wavelength is measured at all azimuthal angles at a polar angle of 60° from the normal direction of the anisotropic light absorbing layer, and
A (0) represents an absorbance in a case where an absorbance of the anisotropic light absorbing layer at the maximum absorption wavelength is measured in the normal direction of the anisotropic light absorbing layer.
2 . The display device according to claim 1 ,
wherein the dichroic substance has a polymerizable group.
3 . The display device according to claim 1 ,
wherein the liquid crystal compound has a polymerizable group.
4 . The display device according to claim 1 ,
wherein the dichroic substance has a polymerizable group containing an ethylenically unsaturated bond and an aromatic ring,
the liquid crystal compound has a polymerizable group containing an ethylenically unsaturated bond and an aromatic ring, and
the anisotropic light absorbing layer satisfies a requirement represented by Expression (3),
0.85< P 1/ P 2≤1.00 Expression (3)
here, P1 represents a smaller value between a P value in one surface and a P value in the other surface, where the two surfaces of the anisotropic light absorbing layer are perpendicular to a thickness direction,
P2 represents a larger value between the P value in the one surface and the P value in the other surface, where the two surfaces of the anisotropic light absorbing layer are perpendicular to the thickness direction,
the P value represents a value represented by I(1)/I(2), where I(1) represents a peak intensity derived from in-plane deformation vibration of the ethylenically unsaturated bond in infrared total reflection absorption spectrum measurement, and I(2) represents a peak intensity derived from stretching vibration of an unsaturated bond of the aromatic ring in the infrared total reflection absorption spectrum measurement, and
in a case where the P value in the one surface and the P value in the other surface, where the two surfaces of the anisotropic light absorbing layer are perpendicular to the thickness direction, are the same, P1/P2 is 1.00.
5 . The display device according to claim 1 ,
wherein the composition further contains a polymerization initiator.
6 . The display device according to claim 5 ,
wherein the polymerization initiator is at least one selected from the group consisting of an oxime ester compound and an acylphosphine compound.
7 . The display device according to claim 1 , further comprising, at a position closer to the viewing side than the self light emitting display element:
a polarizer; and
a λ/4 plate,
wherein the polarizer, the λ/4 plate, and the anisotropic light absorbing layer are disposed in order from the viewing side, or the polarizer, the anisotropic light absorbing layer, and the λ/4 plate are disposed in order from the viewing side.
8 . The display device according to claim 2 ,
wherein the liquid crystal compound has a polymerizable group.
9 . The display device according to claim 2 ,
wherein the dichroic substance has a polymerizable group containing an ethylenically unsaturated bond and an aromatic ring,
the liquid crystal compound has a polymerizable group containing an ethylenically unsaturated bond and an aromatic ring, and
the anisotropic light absorbing layer satisfies a requirement represented by Expression (3),
0.85< P 1/ P 2≤1.00 Expression (3)
here, P1 represents a smaller value between a P value in one surface and a P value in the other surface, where the two surfaces of the anisotropic light absorbing layer are perpendicular to a thickness direction,
P2 represents a larger value between the P value in the one surface and the P value in the other surface, where the two surfaces of the anisotropic light absorbing layer are perpendicular to the thickness direction,
the P value represents a value represented by I(1)/I(2), where I(1) represents a peak intensity derived from in-plane deformation vibration of the ethylenically unsaturated bond in infrared total reflection absorption spectrum measurement, and I(2) represents a peak intensity derived from stretching vibration of an unsaturated bond of the aromatic ring in the infrared total reflection absorption spectrum measurement, and
in a case where the P value in the one surface and the P value in the other surface, where the two surfaces of the anisotropic light absorbing layer are perpendicular to the thickness direction, are the same, P1/P2 is 1.00.
10 . The display device according to claim 2 ,
wherein the composition further contains a polymerization initiator.
11 . The display device according to claim 10 ,
wherein the polymerization initiator is at least one selected from the group consisting of an oxime ester compound and an acylphosphine compound.
12 . The display device according to claim 2 , further comprising, at a position closer to the viewing side than the self light emitting display element:
a polarizer; and
a λ/4 plate,
wherein the polarizer, the λ/4 plate, and the anisotropic light absorbing layer are disposed in order from the viewing side, or the polarizer, the anisotropic light absorbing layer, and the λ/4 plate are disposed in order from the viewing side.
13 . The display device according to claim 3 ,
wherein the dichroic substance has a polymerizable group containing an ethylenically unsaturated bond and an aromatic ring,
the liquid crystal compound has a polymerizable group containing an ethylenically unsaturated bond and an aromatic ring, and
the anisotropic light absorbing layer satisfies a requirement represented by Expression (3),
0.85< P 1/ P 2≤1.00 Expression (3)
here, P1 represents a smaller value between a P value in one surface and a P value in the other surface, where the two surfaces of the anisotropic light absorbing layer are perpendicular to a thickness direction,
P2 represents a larger value between the P value in the one surface and the P value in the other surface, where the two surfaces of the anisotropic light absorbing layer are perpendicular to the thickness direction,
the P value represents a value represented by I(1)/I(2), where I(1) represents a peak intensity derived from in-plane deformation vibration of the ethylenically unsaturated bond in infrared total reflection absorption spectrum measurement, and I(2) represents a peak intensity derived from stretching vibration of an unsaturated bond of the aromatic ring in the infrared total reflection absorption spectrum measurement, and
in a case where the P value in the one surface and the P value in the other surface, where the two surfaces of the anisotropic light absorbing layer are perpendicular to the thickness direction, are the same, P1/P2 is 1.00.
14 . The display device according to claim 3 ,
wherein the composition further contains a polymerization initiator.
15 . The display device according to claim 14 ,
wherein the polymerization initiator is at least one selected from the group consisting of an oxime ester compound and an acylphosphine compound.
16 . The display device according to claim 3 , further comprising, at a position closer to the viewing side than the self light emitting display element:
a polarizer; and
a λ/4 plate,
wherein the polarizer, the λ/4 plate, and the anisotropic light absorbing layer are disposed in order from the viewing side, or the polarizer, the anisotropic light absorbing layer, and the λ/4 plate are disposed in order from the viewing side.
17 . The display device according to claim 4 ,
wherein the composition further contains a polymerization initiator.
18 . The display device according to claim 17 ,
wherein the polymerization initiator is at least one selected from the group consisting of an oxime ester compound and an acylphosphine compound.
19 . The display device according to claim 4 , further comprising, at a position closer to the viewing side than the self light emitting display element:
a polarizer; and
a λ/4 plate,
wherein the polarizer, the λ/4 plate, and the anisotropic light absorbing layer are disposed in order from the viewing side, or the polarizer, the anisotropic light absorbing layer, and the λ/4 plate are disposed in order from the viewing side.
20 . The display device according to claim 5 , further comprising, at a position closer to the viewing side than the self light emitting display element:
a polarizer; and
a λ/4 plate,
wherein the polarizer, the λ/4 plate, and the anisotropic light absorbing layer are disposed in order from the viewing side, or the polarizer, the anisotropic light absorbing layer, and the λ/4 plate are disposed in order from the viewing side.