Patent ID: 6677925
Filing Date: 2004-01-13
Classification: G09G

Abstract:
An active-matrix-type liquid crystal display device, comprising:a plurality of scanning signal lines; a plurality of data signal lines crossing said scanning signal lines; pixels each including a switching element that connects a pixel electrode with a corresponding data signal line when a scanning signal of a corresponding scanning signal line instructs conduction, said pixels being provided so as to respectively correspond to combinations of said scanning signal lines and said data signal lines; common electrodes provided at positions vis-a-vis said pixel electrodes, a liquid crystal layer being provided between said common electrodes and said pixel electrodes, a common electrode signal being applied to said common electrodes; data signal line driving means for generating an output signal to each data signal line, based on display data of each pixel; a coupling section for, based on the outputs to said data signal lines, generating a coupling signal in accordance with a sum of the outputs, said coupling section including a coupling capacitor that couples a driving signal with the coupling signal; common electrode driving means for, based on the coupling signal and the driving signal as a reference used in generation of the common electrode signal, generating the common electrode signal that is given an influence such as to suppress potential turbulence caused by an output to each data signal line, by comparing the common electrode signal with a common electrode signal generated according to only the driving signal; and wherein said common electrode driving means amplifies the driving signal coupled with the coupling signal, so as to generate the common electrode signal.