A liquid crystal display device is provided which has a large aperture ratio and which can prevent any leak occurrence and/or short circuiting between a pixel electrode and the opposite electrode. An organic interlayer dielectric film having a low dielectric constant is formed on a glass substrate and on a thin film transistor, also on a bus line for supplying an electric signal to the thin film transistor. Pixel electrodes operative to apply an electric field to the liquid crystal through the thin film transistor are formed on the organic interlayer dielectric film. An inorganic interlayer dielectric film having a high dielectric constant which is comprised of silicon nitride is formed on the pixel electrodes, and additional capacity electrodes are formed on the high dielectric-constant inorganic dielectric film in such a way that they partially overlie individual pixel electrodes, the additional capacity electrodes being operative to intercept light so as not to allow light transmission through a space between adjacent pixel electrodes.