Patent ID: 7436384

Claim:
A data driving apparatus for a liquid crystal display, comprising: a plurality of data driving integrated circuits adjacent to a liquid crystal display panel to convert input pixel data into pixel voltage signals; one or more multiplexor arrays provided adjacent to the liquid crystal display panel to make a time-division of a plurality of data lines into a plurality of regions to selectively apply the pixel voltage signals received from the plurality of data driving integrated circuits to the plurality of data lines; and a timing controller for controlling the data driving integrated circuits and the multiplexor array and for re-arranging the pixel data to be supplied to each of the data driving integrated circuits to make the time-division of the pixel data into the plurality of regions, the multiplexor array including: a plurality of switching devices to selectively drive the plurality of data lines connected thereto, and a control line electrically connected to a pair of the switching devices to apply a control signal to one switching device of the pair and an inverted control signal to the other switching device of the pair simultaneously to selectively apply the pixel voltage signals between a pair of the data lines, wherein each of the plurality of switching devices is an individual transistor including a gate electrode, a gate insulating film on the gate electrode, an active layer on the gate insulating film overlapping with the gate electrode, the active layer being formed of an amorphous silicon layer, a source electrode on the active layer having a portion overlapping with the gate electrode and the active layer, wherein the overlapping portion has a square band encompassing an outside perimeter of the gate electrode, a plurality of first portions extending inwardly from one side of the square band, and a plurality of second portions extending inwardly from an opposite side of the square band, and a drain electrode on the active layer having a portion overlapping with the gate electrode and the active layer and having a constant distance from the source electrode, wherein the overlapping portion of the drain electrode has a central portion between the first portions and the second portions, a plurality of third portions extending from one side of the central portion so as to form a first channel portion with the plurality of first portions and the first side of the source electrode, and a plurality of fourth portions extending from an opposite side of the central portion so as to form a second channel portion with the plurality of second portions and the opposite side of the source electrode, wherein the second channel portion is continuous with the first channel portion, wherein the multiplexor array is formed simultaneously with an amorphous silicon thin film transistor array for pixels of the liquid crystal display.