Liquid crystal display device comprising a first electrode in contact with a bottom surface and a second electrode in contact with a top surface of a single layer insulating film comprising concave and convex portions

Abstract

A wide viewing angle is achieved with a liquid crystal display device according to an embodiment of this invention, in which alignment directions of liquid crystal molecules are controlled by electric field between electrodes on a substrate. A pixel electrode and an insulating film covering the pixel electrode are formed on a TFT substrate. A plurality of concave portions and convex portions extending in parallel to each other are formed in the insulating film alternately. A common electrode is formed on each of the concave portions. And a CF substrate is disposed facing to the common electrodes. A liquid crystal layer is disposed between the insulating film and the common electrodes and the liquid crystal layer. When a predetermined voltage is applied to the pixel electrode to induce an electric field between the pixel electrode and the common electrodes, liquid crystal molecules are rotated along lines of electric force of the electric field in a plane parallel to the TFT substrate. Also, the liquid crystal molecules tilt vertically between the common electrodes symmetrically with respect to a center line between a neighboring pair of the common electrodes.