Patent ID: 8411242

Claim:
An active matrix liquid crystal display device, comprising: a first substrate including a scan signal wiring line, a common signal wiring line parallel to the scan signal wiring line, a video signal wiring line intersecting the scan signal wiring line and the common signal wiring line, and a pixel, which is disposed in a first region surrounded with the scan signal wiring lines and the video signal wiring lines, the pixel including a thin film transistor, a source electrode of the thin film transistor formed in a same first layer as the video signal wiring line, a pixel electrode connected to the source electrode, and a common electrode connected to the common signal wiring line, the pixel electrode and the common electrode being formed in a same single second layer, and at least one insulating film being provided between the first layer of the video signal wiring line and the second layer of the pixel electrode and the common electrode; a second substrate facing the first substrate; and a liquid crystal layer sandwiched by the first substrate and the second substrate, wherein a molecular axis of the liquid crystal layer is rotatable in a plane parallel to the first substrate by the electric field between the pixel electrode and the common electrode, a display area where the pixel electrode and the common electrode are formed in parallel to each other, the pixel electrode overlaps with the common signal wiring line at an end of the pixel electrode, in a region where the pixel electrode overlaps with the common signal wiring line, at one side of the pixel electrode, a width of the pixel electrode is increased, so as to face the common electrode with a narrower electrode spacing in order to prevent a reverse rotation of the molecular axis of the liquid crystal layer, and the pixel electrode edge, which is along a boundary between the pixel electrode with increased width and the display area, is parallel to the common signal wiring line edge which is along a boundary between the common signal wiring line and the display area.