Patent ID: 8461054

Claim:
A method of manufacturing a liquid crystal display device which includes pixel electrodes and common electrodes which are alternatively arranged in each pixel defined on a substrate, comprising the steps of: forming a conductive film, a mask layer and a photo-resist film on the substrate, the mask layer including an insulating material having an etching selection ratio higher than the conductive layer and the photo-resist film including first, second, third and fourth areas positioned in a direction; firstly exposing the first and second areas of the photo-resist film; secondly exposing the second and third areas of the photo-resist film to form a photo-resist pattern; forming a mask pattern having opposite side surfaces, the opposite side surfaces having undercut shapes that are inwardly dented from opposite side surfaces of the photo-resist pattern, by etching the mask layer by use of the photo-resist pattern as an etching mask; removing the photo-resist pattern; and etching the conductive film by use of the mask pattern as an etching mask, to form the common electrode and the pixel electrode, the common electrode and the pixel electrode each has opposite side surfaces, and the opposite side surfaces of at least one of the common electrode and the pixel electrode having undercut shapes that are inwardly dented from the opposite side surfaces of the mask pattern.