Liquid crystal display

A liquid crystal display, comprising a first polarizer, a liquid crystal layer and a second polarizer, the liquid crystal layer disposed between the first polarizer and the second polarizer, the first polarizer comprising a first triacetyl cellulose layer, a first poly vinyl alcohol layer, a first biaxial layer and a first substrate, the first poly vinyl alcohol layer disposed on the first triacetyl cellulose layer, the first biaxial layer disposed on the first poly vinyl alcohol layer, the first triacetyl cellulose layer, the first poly vinyl alcohol layer and the first biaxial layer fixed to the first substrate, the second polarizer comprising a second substrate, a second triacetyl cellulose layer, a second poly vinyl alcohol layer and a third triacetyl cellulose layer, the second poly vinyl alcohol layer disposed on the second triacetyl cellulose layer, the third triacetyl cellulose layer disposed on the second poly vinyl alcohol layer, the third triacetyl cellulose layer, the second poly vinyl alcohol layer and the second triacetyl cellulose layer fixed to the second substrate, wherein when a wavelength is 550 nanometers, a compensation value Rth1 of the biaxial layer and a range [Y1, Y2] of a compensation value Rth2 of the second triacetyl cellulose layer satisfy the following equations (1) and (2):

• Y1=−0.002107×(Rth1)2−0.01686×(Rth1)+206.5 (1)
• Y2=−0.006137×(Rth1)2+1.703×(Rth1)+75.16 (2)
• the compensation value Rth1 of the first biaxial layer is a thickness-direction plane retardation of the first biaxial layer, the compensation value Rth2 of the second triacetyl cellulose layer is a thickness-direction plane retardation of the second triacetyl cellulose layer, Y1 is a minimum value of the compensation value Rth2 of the second triacetyl cellulose layer, and Y2 is a maximum value of the compensation value Rth2 of the second triacetyl cellulose layer,
• when the compensation value Rth1 of the first biaxial layer is selected as a first predetermined value, the minimum value Y1 and the maximum value Y2 of the compensation value Rth2 of the second triacetyl cellulose layer are obtained from the above-mentioned equations (1) and (2), the compensation value Rth2 of the second triacetyl cellulose layer is selected as a second predetermined value which is ranged between the minimum value Y1 and the maximum value Y2, and the first predetermined value satisfies the following equation (3):
• Rth1=[(Nx1−Ny1)/2−Nz1]×d1 (3)
• two directions perpendicular to each other on a plane of the biaxial layer are respectively defined as an X axis and a Y-axis, a direction perpendicular to a thickness direction of the first biaxial layer is defined as a Z axis, Nx1 is a refractive index of the first biaxial layer in a direction of the X axis, Ny1 is a refractive index of the first biaxial layer in a direction of the Y axis, Nz1 is a refractive index of the first biaxial layer in a direction of the Z axis, and d1 is a thickness of the first biaxial layer,
• the second predetermined value satisfies the following equation (4):
• Rth2=[(Nx2−Ny2)/2−Nz2]×d2 (4)
• two directions perpendicular to each other on a plane of the second triacetyl cellulose layer are respectively defined as an X axis and a Y-axis, a direction perpendicular to a thickness direction of the second triacetyl cellulose layer is defined as a Z axis, Nx2 is a refractive index of the second triacetyl cellulose layer in a direction of the X axis, Ny1 is a refractive index of the second triacetyl cellulose layer in a direction of the Y axis, Nz1 is a refractive index of the second triacetyl cellulose layer in a direction of the Z axis, and d2 is a thickness of the second triacetyl cellulose layer.

A liquid crystal display, comprising a first polarizer, a liquid crystal layer and a second polarizer, the liquid crystal layer disposed between the first polarizer and the second polarizer, the first polarizer comprising a first triacetyt cellulose layer, a first poly vinyl alcohol layer, a first biaxial layer and a first substrate, the first poly vinyl alcohol layer disposed on the first triacetyl cellulose layer, the first biaxial layer disposed on the first poly vinyl alcohol layer, the first triacetyl cellulose layer, the first poly vinyl alcohol layer and the first biaxial layer fixed to the first substrate, the second polarizer comprising a second substrate, a second triacetyl cellulose layer, a second poly vinyl alcohol layer and a third triacetyl cellulose layer, the second poly vinyl alcohol layer disposed on the second triacetyl cellulose layer, the third triacetyl cellulose layer disposed on the second poly vinyl alcohol layer, the third triacetyl cellulose layer, the second poly vinyl alcohol layer and the second triacetyl cellulose layer fixed to the second substrate, wherein when a wavelength is 550 nanometers, a compensation value Rth1 of the biaxial layer and a range [Y1, Y2] of a compensation value Rth2 of the second triacetyl cellulose layer satisfy the following equations (1) and (2):

• Y1=−0.002107×(Rth1)2−0.01686×(Rth1)+206.5 (1)
• Y2=−0.006137×(Rth1)2+1.703×(Rth1)+75 16 (2)
• the compensation value Rth1 of the biaxial layer is a thickness-direction plane retardation of the biaxial layer, the compensation value Rth2 of the second triacetyl cellulose layer is a thickness-direction plane retardation of the second triacetyl cellulose layer, Y1 is a minimum value of the compensation value Rth2 of the second triacetyl cellulose layer, and Y2 is a maximum value of the compensation value Rth2 of the second triacetyl cellulose layer.