Patent ID: 6166725
Filing Date: 2000-12-26
Classification: G09G

Abstract:
A liquid crystal display device comprisinga liquid crystal display panel includinga plurality of video signal lines,a plurality of scanning signal lines perpendicular to the plurality of video signal lines, anda plurality of pixels arranged in a matrix and each surrounded by two adjacent video signal lines among the plurality of video signal lines and by two adjacent scanning signal lines among the plurality of scanning signal lines;a video signal line drive circuit connected to each of the plurality of video signal lines which outputs LC driving voltages to each of the plurality of video signal lines to apply the LC driving voltages to each of the plurality of pixels; anda display control circuit which controls and drives the video signal line drive circuit;wherein the video signal line drive circuit includes:a first drive voltage circuit includingat least one first output circuit each including a latch circuit which latches display data, and a decoder circuit which selects and outputs an LC driving voltage of positive polarity corresponding to the display data, andat least one second output circuit each including a latch circuit which latches display data, and a decoder circuit which selects and outputs an LC driving voltage of negative polarity corresponding to the display data,the at least one first output circuit and the at least one second output circuit being arranged alternately in a first polarity order;a second drive voltage circuit includingat least one third output circuit each including a latch circuit which latches display data, and a decoder circuit which selects and outputs an LC driving voltage of positive polarity corresponding to the display data, andat least one fourth output circuit each including a latch circuit which latches display data, and a decoder circuit which selects and outputs an LC driving voltage of negative polarity corresponding to the display data,the at least one third output circuit and the at least one fourth output circuit being arranged alternately in a second polarity order opposite to the first polarity order in which the at least one first output circuit and the at least one second output circuit of the first drive voltage circuit are arranged alternately;a first switching circuit which inputs display data sequentially transferred from the display control circuit to the latch circuits of the first voltage drive circuit and the second voltage drive circuit ina first input order in which display data is sequentially inputted first to the latch circuits of the first drive voltage circuit and then to the latch circuits of the second drive voltage circuit, anda second input order in which display data is sequentially inputted first to the latch circuits of the second drive voltage circuit and then to the latch circuits of the first drive voltage circuit,the first switching circuit alternating the first input order and the second input order based on a display control signal from the display control circuit; anda second switching circuit which supplies outputs from the first drive voltage circuit and the second drive voltage circuit to each of the plurality of video signal lines ina first output arrangement corresponding to the first input order of the first switching circuit, anda second output arrangement corresponding to the second input order of the first switching circuit,the second switching circuit alternating the first output arrangement and the second output arrangement in synchronism with the alternation of the first input order and the second input order by the first switching circuit.