In-plane switching liquid crystal display device having circular electrode

An in-plane switching liquid crystal display device comprising:

• first and second substrates;
• gate lines and data lines on the first substrate and intersecting each other;
• a plurality of unit pixels defined by the intersection of the gate and data lines, each unit pixel including at least one first sub-pixel region and at least one second sub-pixel region, the first sub-pixel region being immediately adjacent to the second sub-pixel region;
• an inner common electrode, a middle pixel electrode, and an outer common electrode alternatedly arranged in the first sub-pixel region, the inner common electrode having a first curved surface shape and the middle pixel electrode having a ring surface shape;
• an inner pixel electrode, a middle common electrode, and an outer pixel electrode alternatively arranged in the second sub-pixel region, the inner pixel electrode having a second curved surface shape and the middle common electrode having a ring surface shape;
• at least one pair of common line and pixel electrode line along an outer edge portion of the unit pixel, wherein the common line is immediately adjacent to the outer pixel electrode in the second sub-pixel region, and the pixel electrode line is immediately adjacent to the outer common electrode in the first sub-pixel region;
• and
• a liquid crystal layer between the first substrate and the second substrate.