Display device and method
View Patent ↗A transmission-type display device, in which a viewing angle thereof is enhanced, comprises: an panel comprising a first substrate where TFTs are formed and a second substrate facing the first substrate; a first retardation film and a first polarizing plate which adhere sequentially to an external surface of the first substrate; and a second retardation film and a second polarizing plate which adhere sequentially to an external surface of the second substrate.
1. A display device comprising:
a first substrate where TFTs are formed;
a second substrate facing the first substrate;
a vertical alignment liquid crystal layer formed between the first substrate and the second substrate;
a first retardation film and a first polarizing plate which adhere sequentially to an external surface of the first substrate; and
a second retardation film and a second polarizing plate which adhere sequentially to an external surface of the second substrate,
wherein one of the first retardation film and the second retardation film comprises a λ/4 film and a C-plate and the other thereof comprises a λ/4 film,
the first substrate comprises a first vertical alignment film,
the second substrate comprises a second vertical alignment film,
rubbing directions of the first vertical alignment film and the second vertical alignment film are opposite to each other, and
the vertical alignment liquid crystal layer has a predetermined pre-tilt angle due to the first vertical alignment film and the second vertical alignment film.
2. The display device according to claim 1 , wherein a phase retardation value (Δnd) of the liquid crystal layer is between about 250 nm and about 350 nm.
3. The display device according to claim 2 , wherein a Rth of each λ/4 film is between about 100 nm and about 140 nm.
4. The display device according to claim 3 , wherein the first retardation film comprises a λ/4 film and a slow axis of the λ/4 film inclines at an angle of about 45 degrees to a transmitting axis of the first polarizing plate.
5. The display device according to claim 4 , wherein the second retardation film comprises a λ/4 film and a slow axis of the λ/4 film inclines at an angle of about 45 degrees to a transmitting axis of the second polarizing plate.
6. The display device according to claim 5 , wherein a direction of the rubbing inclines at an angle of about 65 degrees to one of the transmitting axis of the first polarizing plate and the transmitting axis of the second polarizing plate, and
the transmitting axis of the first polarizing plate is perpendicular to the transmitting axis of the second polarizing plate.
7. The display device according to claim 4 , wherein the first retardation film and the second retardation film each comprise a λ/4 film, and a R o of each λ/4 film is between about 100 nm and about 140 nm.
8. The display device according to claim 7 , wherein the first retardation film comprises a first λ/4 film and the second retardation film comprises a second λ/4 film, and a slow axis of the first λ/4 film is perpendicular to the transmitting axis of the second λ/4 film.
9. The display device according to claim 4 , wherein Rth, total of the C-plate is between about 100 nm and about 340 nm.