Patent ID: 7038740

Claim:
A liquid crystal display device comprising: a thin film transistor array substrate including thin film transistors supported by an insulating substrate and each of which has a gate electrode, a source electrode and a drain electrode; pixel electrodes comprised of transparent conductive films connected to respective thin film transistors; supplementary capacitances for retaining electric charges of the pixel electrodes; and a liquid crystal layer between at least the thin film transistor array substrate and an opposite substrate, the supplementary capacitance for a pixel region comprising a pixel electrode, a supplementary capacitance use transparent insulating film formed under at least the pixel electrode and a common electrode that is formed under the supplementary capacitance use transparent insulating film and comprised of a transparent conductive film connected to a potential, and wherein, for the supplementary capacitance in the pixel region, the supplementary capacitance use transparent insulating film has a film thickness d so as to satisfy the following equation: d =λ/(2 ×n )× m where m is an integer, and n is an index of refraction of the transparent insulating film of the supplementary capacitance, and λ is a wavelength at which transmittance is desired to be increased, so that materials and thicknesses thereof of the supplementary capacitance are selected so as to increase transmittance at the wavelength λ.