In a liquid crystal display device, the device includes a first substrate, a second substrate and a liquid crystal layer interposed therebetween. The first substrate includes a pixel electrode, a thin film transistor connected to the pixel electrode, and also a hitch to connect both a lower and upper electrode of the pixel electrode. The second substrate includes a common electrode having a lower domain division part and an upper domain division part, in which each of domain division part is formed at the position corresponding to the lower and upper electrode of the pixel electrode, respectively. Through the electric field controller connected at both sides of the upper electrode of the pixel electrode, quality of display image can improve without a darkening area occurring at one part of the unit pixel.
1. A liquid crystal display device comprising:
a lower substrate including a pixel electrode and a thin film transistor coupled to the pixel electrode;
an upper substrate including a common electrode; and
a liquid crystal layer interposed between the lower substrate and the upper substrate;
wherein the pixel electrode includes a main body part and an electric field controller,
wherein the electric field controller includes one of a convex portion protruding from a lateral side of the main body part and a concave portion recessed from the lateral side of the main body part; and
wherein each of the portions of the electric field controller has a general shape that is one of an isosceles triangle, an isosceles trapezoid, and a right triangle; and
wherein an included angle between a lateral side of the shape of the included portion of the electric field controller and a corresponding lateral side of the main body part is in a range of about 2 to about 22.5 degrees.
2. The liquid crystal display device according to claim 1 , wherein the main body part includes a lower main body part, an upper main body part and a hitch for electrically connecting the lower and upper main body parts.
3. The liquid crystal display device according to claim 2 further comprising a lower domain division part and an upper domain division part in the common electrode.
4. The liquid crystal display device according to claim 3 , wherein the upper domain division part faces the center of the upper main body part in a second direction.
5. The liquid crystal display device according to claim 3 , wherein the lower domain division part faces the center of the upper main body part in a first direction and the upper domain division part is formed facing the center of the lower main body part in a second direction.
6. The liquid crystal display device according to claim 3 , wherein each of the lower domain division part and an upper domain division part includes an opening area.
7. The liquid crystal display device according to claim 3 , wherein each of the lower domain division part and an upper domain division part includes a protrusion area.
8. The liquid crystal display device according to claim 2 , wherein the electric field controller includes an upper electric field controller connected to the upper main body part.
9. The liquid crystal display device according to claim 8 , wherein the electric field further includes a lower electric field controller connected to the lower main body part.
10. The liquid crystal display device according to claim 9 , wherein an angle between the lateral side of the upper main body part and a lateral side of the upper electric field controller is from about 2 to about 22.5 degrees, and an angle between the lateral side of the lower main body part and a lateral side of the lower electric field controller is from about 22 to about 22.5 degrees.
11. The liquid crystal display device according to claim 8 , wherein the upper electric field controller has a convex portion which protrudes from a lateral side of the upper main body part.
12. The liquid crystal display device according to claim 8 , wherein the upper electric field controller has a concave portion which is recessed from a lateral side of the main body part.
13. The liquid crystal display device according to claim 11 , wherein the lower electric field controller has a convex portion protruding from an upper lateral side or a lower lateral side of the lower main body part,
wherein the convex portion of the lower electric field controller protrudes in a first direction, and the convex portion of the upper electric field controller protrudes in a second direction substantially perpendicular to the first direction.
14. The liquid crystal display device according to claim 12 , wherein the lower electric field controller has a concave portion recessed from an upper lateral side or a lower lateral side of the lower main body part,
wherein the concave portion of the lower electric field controller is recessed in a first direction, and the concave portion of the upper electric field controller is recessed in a second direction substantially perpendicular to the first direction.
15. The liquid crystal display device according to claim 8 , wherein the upper electric field controller is symmetrically formed at both lateral sides of the upper main body part.
16. The liquid crystal display device according to claim 2 , wherein the main body part includes removed portions at corners of the lower and upper main body parts which are rectangular.
17. A liquid crystal display device comprising:
a lower substrate including a pixel electrode including an electric field controller, a lower main body part and an upper main body part which are electrically coupled by a hitch;
an upper substrate including a lower domain division part and an upper domain division part in a common electrode; and
a liquid crystal layer interposed between the lower substrate and the upper substrate;
wherein the lower domain division part is formed along a first direction, and the upper domain division part and the electric field controller are formed along a second direction;
wherein the electric field controller includes an upper electric field controller connected to both lateral sides of the upper main body part;
wherein the upper electric field controller includes one of convex portions protruding from lateral sides of the upper main body part and concave portions recessed from the lateral sides of the upper main body part;
wherein the portions of the upper electric field controller each have a general shape that is one of an isosceles triangle, an isosceles trapezoid, and a right triangle; and
wherein an angle between a lateral side of each shape and a lateral side of the upper main body part is in a range of about 2 to about 22.5 degrees.
18. The liquid crystal display device according to claim 17 , wherein the upper domain division part faces the center of the upper main body part along a second direction.
19. The liquid crystal display device according to claim 15 , wherein the lower electric field controller is symmetrically formed at an upper lateral side and a lower lateral side of the lower main body part.
20. The liquid crystal display device according to claim 17 , wherein the electric field controller further includes a lower electric field controller connected to an upper lateral side and a lower lateral side of the lower main body part,
wherein the lower electric field controller includes a convex portion which protrudes from the upper and lower lateral sides of the lower main body part or a concave portion which is recessed from the upper and lower lateral sides of the lower main body part,
wherein the convex or concave portion of the lower electric field controller has a polygonal shape selected from an isosceles triangular shape, an isosceles trapezoid shape and a right triangular shape, and
wherein an angle between a lateral side of the polygonal shape of the lower electric field controller and the lateral side of the lower main body part is in a range of 2 to 22.5 degrees.