Patent ID: 8232949

Claim:
A liquid crystal display device for obtaining displayed images by driving a plurality of rows of scanning electrodes and a plurality of columns of data electrodes, both being arranged to be orthogonal to one another, according to an input video signal so that specified display data is written in each pixel region corresponding to a liquid crystal layer, comprising: a driving control circuit to perform a field dividing driving operation by which an odd field period, during which each of scanning electrodes in odd-numbered rows is sequentially driven while skipping over scanning electrodes in all even-numbered rows, and an even field period, during which each of scanning electrodes in even-numbered rows is sequentially driven while skipping over scanning electrodes in all odd-numbered rows, occur alternately and repeatedly in every display frame period, the driving control circuit comprising: a frame memory which stores sequentially the input video signal, a black signal converting unit which divides the odd field period into a first half comprising a first odd sub-field which outputs display data corresponding to the odd-numbered rows of the input video signal and into a second half comprising a second odd sub-field which outputs dark data, and divides the even field period into a first half comprising a first even sub-field which outputs display data corresponding to the even-numbered rows of the input video signal and into a second half comprising a second even sub-field which outputs the dark data, by using the input video signal fed from the frame memory, and a driving control unit, which writes line-sequentially the display data fed from said black signal converting unit in the odd-numbered rows of pixel regions during said first odd sub-field, and writes line-sequentially the dark data fed from said black signal converting unit in the odd-numbered rows of pixel regions during said second odd sub-field, by driving said scanning electrodes in the odd-numbered rows during the odd field period, writes line-sequentially the display data fed from said black signal converting unit in the even-numbered rows of pixel regions during said first even sub-field, and writes line-sequentially the dark data fed from said black signal converting unit in the even-numbered rows of pixel regions during said second even sub-field, by driving said scanning electrodes in the even-numbered rows during the even field period, and inverts a polarity of voltage of the display data to be written in the pixel regions corresponding to each of said scanning electrodes in every two fields, repeatedly for every four fields as a whole.