A pair of polarizers having different polarization efficiencies is employed for a display device. With such a pair of polarizers, the brightness may increase without deteriorating the contrast.
1. A display device comprising:
a backlight assembly;
a first polarizer disposed above the backlight assembly to receive light from the backlight assembly, the first polarizer having a first polarization efficiency and a first axis of transmission;
a second polarizer disposed above the first polarizer so as to receive light passed through at least the first polarizer, the second polarizer having a second polarization efficiency higher than the first polarization efficiency and a second axis of transmission different from that of the first polarizer, wherein the second polarization efficiency is 99.97% or higher, and
a twisted nematic liquid crystal layer disposed between the first polarizer and the second polarizer.
2. The display device of claim 1 , wherein the first axis of transmission is substantially perpendicular to the second axis of transmission.
3. The display device of claim 2 , wherein the first polarization efficiency is in the range of about 98.99% to 99.15% with respect to a white light from a black body light source at about 6500K.
4. The display device of claim 2 , wherein the second polarization efficiency is in the range of about 99.97% to 99.99% with respect to a white light from a black body light source at about 6500K.
5. The display device of claim 1 , wherein the backlight assembly comprises:
a light guide plate;
a light source disposed at the light guide plate, and
a diffuser disposed between the first polarizer and the light guide plate.
6. A display device comprising:
a backlight assembly configured for providing a light;
a first polarizer disposed above the backlight assembly to receive the provided light of the backlight assembly, the first polarizer having a first polarization efficiency and a first transmission axis;
a second polarizer disposed above the first polarizer so as to receive light passed through at least the first polarizer, the second polarizer having a second polarization efficiency and a second transmission axis, the second polarization efficiency being higher than 99.97%, the second polarization efficiency being higher than the first polarization efficiency, and the second transmission axis being substantially perpendicular to the first transmission axis;
a first substrate disposed between the first polarizer and the second polarizer;
a second substrate disposed between the first substrate and the second polarizer;
a liquid crystal layer disposed between the first substrate and the second substrate having a positive dielectric anisotropy.
7. The display device of claim 6 , wherein the first polarization efficiency is in the range of about 98.99% to 99.15% with respect to a white light from a black body light source at about 6500K.
8. The display device of claim 6 , wherein the second polarization efficiency is in the range of about 99.97% to 99.99% with respect to a white light from a black body light source at about 6500K.
9. The display device of claim 6 , further comprising:
a gate line formed on the first substrate and having a gate electrode;
an gate insulating layer on the gate electrode;
a semiconductor formed on the gate insulating layer and overlapping the gate electrode;
a data line including a source electrode, the source electrode being formed at least in part on the semiconductor;
a drain electrode formed at least in part on the semiconductor and spaced apart from the source electrode;
a passivation layer covering a gap between the source electrode and the drain electrode;
a color filter on the passivation layer;
a pixel electrode formed on the color filter and electrically connected to the drain electrode, and
a reference electrode on the second substrate.
10. The display device of claim 9 , further comprising:
an organic insulating layer between the color filter and the pixel electrode.