Patent ID: 8416164

Claim:
A liquid crystal display device comprising: a lower substrate having a first and a second common voltage supply lines, pixel regions defined by a plurality of gate lines and a plurality of data lines and said pixel regions arranged in a matrix, and a plurality of common lines electrically connected to the second common voltage supply line and substantially parallel to each of the gate lines; an upper substrate disposed to face the lower substrate and having a common electrode electrically connected to the first common voltage supply line; a plurality of dots that electrically connect the first common voltage supply line and the common electrode; and a common voltage generator that generates a first and a second common voltage for independently supplying the first and the second common voltage to the first and the second common voltage supply lines, wherein the first common voltage supply line is electrically isolated from and disconnected to the second common voltage supply line, wherein the first and second common voltage supply lines are arranged substantially parallel to each of the data lines, wherein the first common voltage supply line is electrically connected to the common electrode of the upper substrate via the plurality of dots, and the second common voltage supply line is electrically connected to the common line of the lower substrate, wherein the first common voltage is supplied to the common electrode of the upper substrate through the first common voltage supply line and the plurality of dots, and the second common voltage is supplied to the common line of the lower substrate through the second common voltage supply lines, and wherein the first common voltage supplied to the common electrode is at least greater than the second common voltage supplied to the common lines in proportion to a difference between a line resistance of the common line of the lower substrate and a sheet resistance of the common electrode of the upper substrate.