Liquid crystal display device of lateral electric field type capable of reducing width of black matrix

A liquid crystal display device of a lateral electric field type performing display by rotating horizontal-aligned liquid crystals by a lateral electric field which is applied across a pixel electrode and a common electrode and is substantially parallel to a substrate, the liquid crystal display comprising:

• a first substrate having a plurality of data lines disposed in parallel and a plurality of scan lines disposed substantially perpendicular to the data lines and in parallel to one another, and having thin film transistors corresponding to respective sub pixels aligned in a matrix surrounded by the data lines and the scan lines and disposed near intersections between the data lines and the scan lines;
• a second substrate opposed to the first substrate via a liquid crystal layer;
• an electric potential supply line extending along the data line in the sub pixel region and connected to a source electrode of the thin film transistor;
• a pixel electrode disposed in a layer upper than the electric potential supply line in the sub pixel region and connected to the electric potential supply line;
• a common electrode formed by a transparent conductive layer having a common electrode first part and a common electrode second part, the common electrode first part being formed in a linear pattern substantially parallel to the scan line and apart from the pixel electrode by a predetermined distance, and the common electrode second part being formed continued to the first part to cover the data line and a separation region between the data line and the electric potential supply line;
• and
• a black matrix formed on the second substrate and disposed to cover the separation region.