Liquid-crystal display and polarizing plate
A novel liquid crystal display is disclosed. The display comprises a pair of substrates disposed facing each other and at least one of which has an electrode, a liquid-crystal layer being sandwiched in between the pair of substrates and comprising liquid-crystal molecules aligned along with a first alignment axis and a second alignment axis respectively formed on facing surfaces of the first and second substrates, a pair of polarizing plates disposed sandwiching the liquid-crystal layer, and at least an optically anisotropic layer disposed between the liquid-crystal layer and either of the polarizing plates, and comprising at least one liquid crystal compound which is aligned along with a third alignment axis and is fixed in the alignment state. And their disposition satisfies at least one of Condition (1): the alignment axes of the substrates are not parallel to transmission axes of the polarizing plates; and Condition (2): the alignment axis of the substrate is not parallel to the alignment axis of the optically anisotropic layer.
1. A liquid crystal display comprising:
a pair of a first substrate and a second substrate disposed facing each other, and at least one of which has an electrode,
a liquid-crystal layer being sandwiched in between the pair of the first substrate and the second substrate and comprising liquid-crystal molecules aligned along with a first alignment axis and a second alignment axis respectively formed on facing surfaces of the first and second substrates,
a pair of a first polarizing plate and a second polarizing plate disposed sandwiching the liquid-crystal layer, the first polarizing plate being disposed nearer to the first substrate than the second polarizing plate and the second polarizing plate being disposed nearer to the second substrate than the first polarizing plate, and
at least a first optically anisotropic layer disposed between the liquid-crystal layer and the first polarizing plate, and comprising at least one liquid crystal compound which is aligned along with a third alignment axis and is fixed in the alignment state;
wherein disposition of the pair of the first substrate and the second substrate, the pair of the first polarizing plate and the second polarizing plate and the first optically anisotropic layer satisfies at least one of Condition (1) and Condition (2), and viewing angle in a vertical direction and/or viewing angle in a horizontal direction are/is better than those found in disposition that satisfies neither of Condition (1) nor Condition (2);
Condition (1)
the first alignment axis is not parallel to a transmission axis of the first polarizing plate, and the second alignment axis is not parallel to a transmission axis of the second polarizing plate; and
Condition (2)
the first alignment axis is not parallel to the third alignment axis.
2. The liquid crystal display of claim 1 , wherein an angle between the first alignment axis and the second alignment axis is from 80 to 100°, and the liquid-crystal layer is a TN mode liquid-crystal layer whose twist angle falls within a range from 80 to 100°.
3. The liquid-crystal display of claim 1 , wherein an absorption axis of the first polarizing plate is parallel to the third alignment axis.
4. The liquid-crystal display of claim 1 , wherein the first polarizing plate is disposed at an observed side and the second polarizing plate is disposed at a backlight side, an absorption axis of the first polarizing plate is rotated by 0.1 to 10° counterclockwise with respect to the first alignment axis and
an absorption axis of the second polarizing plate is rotated by 0.1 to 10° clockwise with respect to the second alignment axis, thereby improving viewing angle in a vertical direction.
5. The liquid-crystal display of claim 1 further comprising a second optically anisotropic layer disposed between the liquid-crystal layer and the second polarizing plate, and comprising at least one liquid crystal compound which is aligned along with a fourth alignment axis and is fixed in the alignment state,
wherein the first polarizing plate is disposed at an observed side and the second polarizing plate is disposed at a backlight side, the third alignment axis is rotated by 0.1 to 10° counterclockwise with respect to the first alignment axis and the fourth alignment axis is rotated by 0.1 to 10° clockwise with respect to the second alignment axis, thereby improving viewing angle in a vertical direction.
6. The liquid crystal display of claim 1 , wherein the first polarizing plate is disposed at an observed side and the second polarizing plate is disposed at a backlight side, an absorption axis of the first polarizing plate is rotated by 0.1 to 10° clockwise with respect to the first alignment axis and an absorption axis of the second polarizing plate is rotated by 0.1 to 10° counterclockwise with respect to the second alignment axis, thereby improving viewing angle in a horizontal direction.
7. The liquid-crystal display of claim 1 further comprising a second optically anisotropic layer disposed between the liquid-crystal layer and the second polarizing plate, and comprising at least one liquid crystal compound which is aligned along with a fourth alignment axis and is fixed in the alignment state,
wherein the first polarizing plate is disposed at an observed side and the second polarizing plate is disposed at a back light side, the third alignment axis is rotated by 0.1 to 10° clockwise with respect to the first alignment axis and the fourth alignment axis is rotated by 0.1 to 10° counterclockwise with respect to the second alignment axis, thereby improving viewing angle in a horizontal direction.