Patent ID: 7728940
Filing Date: 2010-06-01
Classification: G02F

Abstract:
1. 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 line and the video signal wiring line, and includes: a thin film transistor; a source electrode of the thin film transistor formed in the same 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, a third region in the edge of the display area, in which the molecular axis of the liquid crystal molecule in the liquid crystal layer rotates in a different direction from the first direction under an electric field applied between an edge of the pixel electrode in the display area and an edge of the common signal wiring line on a side of the display area; a fourth region on the common signal wiring line, which is close to the third region, 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 liquid crystal can be rotated in a plane parallel to the first substrate by the electric field between the pixel electrode and the common electrode, the pixel electrode overlaps with the common signal wiring line at an end of the pixel electrode, and in a region where the pixel electrode overlaps with the common signal wiring line, at the side of the pixel electrode where the electric field between the common signal wiring line and the pixel electrode rotates the molecular axis of liquid crystal in the direction, which is opposite to the direction to which the electric field between the pixel electrode and the common electrode in the adjacent display area rotates the molecular axis of liquid crystal, a width of the pixel electrode is increased, so as to face the common electrode with a narrower electrode spacing, and the pixel electrode edge, which is along the boundary between the pixel electrode with increased width and the display area, is parallel to the common signal wiring line edge which is along the boundary with the display area, and the molecular axis of the liquid crystal molecule in the liquid layer rotates in the first direction under a fringe electric field, which occurs in a vicinity of an edge of the pixel electrode in the fourth region, the pixel electrode overlapping with the common signal wiring line in the fourth region.