Optical compensation film, polarizing plate and liquid crystal display device

A polarizing plate comprising:

• a polarizing film, and
• an optical compensation film on at least one side of the polarizing film, wherein the optical compensation film comprises a first optically anisotropic layer, and
• a second optically anisotropic layer,
• wherein the first optically anisotropic layer satisfies at least one of the following Expressions (i) to (iii):
• 1≦Re1450)(0°)/Re1650)(0°)≦1.25:
• Equation (i)
• 1≦Re1450)(40°)/Re1650)(40°)≦1.25:
• Equation (ii)
• 1≦Re1450)(−40°)/Re1650)(−40°)≦1.25:
• Equation (iii)
• in Expressions (i) to (iii), Re1λ(θ) is defined as the value of Re retardation in the first optically anisotropic layer determined in the condition that a light of wavelength λ(nm) is entered at an incident angle Er from the normal line with the retardant phase being defined as the rotation axis, wherein when the values of Re1λ(θ) and Re1λ(−θ) are different, the magnitude is decided so as to become Re1λ(θ)>Re1λ(−θ);
• wherein the first optically anisotropic layer is composed of at least a disc-like liquid-crystal compound, and
• wherein the disc-like liquid crystal compound comprises at least a compound expressed by the general formula (DI):
• in general formula (DI), Y11, Y12 and Y13 represent each independently a methine or nitrogen atom;
• L1, L2 and L3 represent each independently a connecting group of single bond or divalent bond;
• H1, H2 and H3 represent each independently one expressed by the general formula (DI-A) or (DI-B);
• R1, R2 and R3 represent each independently one expressed by the general formula (DI-R);
• in the general formula (DI-A), YA1 and YA2 each represents a nitrogen atom;
• XA represents an oxygen atom;
• * indicates a site to bond with L1 to L3;
• ** indicates a site to bond with R1 to R3;
• in the general formula (DI-B), YB1 and YB2 each represents a nitrogen atom;
• XB represents an oxygen atom;
• * indicates a site to bond with L1 to L3;
• ** indicates a site to bond with R1 to R3;
• *-(-L21-M)n1-L22-L23-Q1 General formula (DI-R):
• in general formula (DI-R), * indicates a site to bond with a five-membered ring in general formula (DI);
• L21 represents a connecting group of single bond or divalent bond;
• L22 represents a divalent connecting group selected from the group consisting of —O—, —O—CO—, —CO—O—, —O—CO—O—, —S—, —NH—, —SO2—, —CH2—, —CH═CH— and —C≡C—;
• L23 represents a divalent connecting group selected from the group consisting of —O—, —S—, —C(═O)—, —SO2—, —NH—, —CH2—, —CH═CH—, and —C≡C—;
• M represent a divalent connecting group having at least a cyclic structure;
• Q1 represent independently a polymerizable group or hydrogen atom;
• n1 is an integer of 0 to 4.

A liquid-crystal display device, comprising:

• a liquid crystal cell, and
• a polarizing plate,
• wherein the polarizing plate comprises a polarizing film, and
• an optical compensation film on at least one side of the polarizing film,
• wherein the optical compensation film comprises a first optically anisotropic layer, and a second optically anisotropic layer,
• wherein the first optically anisotropic layer satisfies at least one of the following Expressions (i) to (iii):
• 1≦Re1450)(0°)/Re1650)(0°)≦1.25:
• Equation (i)
• 1≦Re1450)(40°)/Re1650)(40°)≦1.25:
• Equation (ii)
• 1≦Re1450)(−40°)/Re1650)(−40°)≦1.25:
• Equation (iii)
• in Expressions (i) to (iii), Re1λ(θ) is defined as the value of Re retardation in the first optically anisotropic layer determined in the condition that a light of wavelength λ(nm) is entered at an incident angle θ° from the normal line with the retardant phase being defined as the rotation axis, wherein when the values of Re1λ(θ) and Re1λ(−θ) are different, the magnitude is decided so as to become Re1λ(θ)>Re1λ(−θ);
• wherein the first optically anisotropic layer is composed of at least a disc-like liquid-crystal compound, and
• wherein the disc-like liquid crystal compound comprises at least a compound expressed by the general formula (DI):
• in general formula (DI), Y11, Y12 and Y13 represent each independently a methine or nitrogen atom;
• L1, L2 and L3 represent each independently a connecting group of single bond or divalent bond;
• H1, H2 and H3 represent each independently one expressed by the general formula (DI-A) or (DI-B);
• R1, R2 and R3 represent each independently one expressed by the general formula (DI-R);
• in the general formula (DI-A), YA1 and YA2 each represents a nitrogen atom;
• XA represents an oxygen atom;
• * indicates a site to bond with L1 to L3;
• ** indicates a site to bond with R1 to R3;
• in the general formula (DI-B), YB1 and YB2 each represents a nitrogen atom;
• XB represents an oxygen atom;
• * indicates a site to bond with L1 to L3;
• ** indicates a site to bond with R1 to R3;
• *-(-L21-M)n1-L22-L23-Q1 General formula (DI-R):
• in general formula (DI-R), * indicates a site to bond with a five-membered ring in general formula (DI);
• L21 represents a connecting group of single bond or divalent bond;
• L22 represents a divalent connecting group selected from the group consisting of —O—, —O—CO—, —CO—O—, —O—CO—O—, —S—, —NH—, —SO2—, —CH2—, —CH═CH— and —C≡C—;
• L23 represents a divalent connecting group selected from the group consisting of —O—, —S—, —C(═O)—, —SO2—, —NH—, —CH2—, —CH═CH—, and —C≡C—;
• M represents a divalent connecting group having at least a cyclic structure;
• Q1 represent independently a polymerizable group or hydrogen atom;
• n1 is an integer of 0 to 4.

An optical compensation film, comprising:

• an optically anisotropic layer,
• wherein the optically anisotropic layer comprises an orientation film and a liquid crystal compound, and
• γsd(AL) and γsd(LC) satisfy the following relation:
• γsd(LC)−γsd(AL)≧−4.0 erg/cm2
• wherein γsd(AL) is a dispersion force component of surface free energy of the orientation film and γsd(LC) is a dispersion force component of surface free energy of the liquid-crystal compound, and
• wherein the liquid crystal compound comprises at least a compound expressed by the general formula (DI):
• in the general formula (DI), Y11, Y12 and Y13 represent each independently a methine or nitrogen atom;
• L1, L2 and L3 represent each independently a connecting group of single bond or divalent bond;
• H1, H2, H3 represent each independently one expressed by the general formula (DI-A) or (DI-B);
• R1, R2 and R3 represent each independent one expressed by the general formula (DI-R);
• in the general formula (DI-A), YA1 and YA2 each represents a nitrogen atom;
• XA represents an oxygen atom;
• * indicates a site to bond with L1 to L3;
• ** indicates a site to bond with R1 to R3;
• in the general formula (DI-B), YB1 and YB2 each represents a nitrogen atom;
• XB represents an oxygen atom, * indicates a site to bond with L1 to L3;
• ** indicates a site to bond with R1 to R3;
• *-(-L21-M)n1-L22-L23-Q1 General formula (DI-R):
• in the general formula (DI-R), * indicates a site to bond with a five-membered ring in general formula (DI);
• L21 represents a connecting group of single bond or divalent bond;
• L22 represents a divalent connecting group selected from the group consisting of —O—, —O—CO—, —CO—O—, —O—CO—O—, —S—, —NH—, —SO2—, —CH2—, —CH═CH—, and —C≡C—;
• L23 represents a divalent connecting group selected from the group consisting of —O—, —S—, —C(═O)—, —SO2—, —NH—, —CH2—, —CH═CH—, and —C≡C—;
• M represents a divalent connecting group having at least a cyclic structure;
• Q1 represents independently a polymerizable group or hydrogen atom;
• n1 is an integer of 0 to 4.