an auxiliary capacitor for a pixel of an active matrix type liquid crystal display is provided without decreasing the aperture ratio . a transparent conductive film for a common electrode is formed under a pixel electrode constituted by a transparent conductive film with an insulation film provided therebetween . further , the transparent conductive film for the common electrode is maintained at fixed potential , formed so as to cover a gate bus line and a source bus line , and configured such that signals on each bus line are not applied to the pixel electrode . the pixel electrode is disposed so that all edges thereof overlap the gate bus line and source bus line . as a result , each of the bus lines serves as a black matrix . further , the pixel electrode overlaps the transparent conductive film for the common electrode to form a storage capacitor .