A large screen liquid crystal display device using a transverse electric field system which is capable of dramatically improving an aperture ratio, a transmittance ratio, brightness, and contrast with low cost and high production yield. For example, the width of the common electrodes that shield the electric fields of the video signal lines can be decreased dramatically and the aperture ratio can be improved dramatically. Especially, the bumps covering the video signal lines can be used along with the spacers, and with the use of halftone exposure method, the bumps covering the video signal lines and the spacers can be constructed at the same time, which dramatically shortens the time required for the production process.