Patent ID: 6825826
Filing Date: 2004-11-30
Classification: G09G

Abstract:
A liquid crystal display apparatus comprising:a pair of substrates, at least one substrate being transparent; a liquid crystal layer sandwiched between the pair of substrates, wherein the one substrate of the pair of substrates includes a plurality of scanning wirings, a plurality of signal wirings, a plurality of thin film semiconductor devices formed in correspondence with intersections of the scanning wirings and the signal wirings, and a display electrode connected to the plurality of semiconductor devices, and wherein another substrate of the pair of substrates includes an opposed electrode; first buses extended continuously over a width of signal wirings, and second buses dividing the width of the signal wirings into a plurality of blocks, as buses for transferring display data to the signal wirings formed on the one substrate, a number of the signal wirings of the second buses being greater than that of the signal wirings of the first buses; a circuit formed between the first and second buses for each of the plurality of blocks, which transfers display data from the first buses to the second buses; a data latch circuit which reads the display data in sequence through the second buses to latch the display data of one block amount; a memory circuit which reads out the display data of the one block amount simultaneously; a level shifter circuit which reads out a content of the memory circuit to change a logical voltage of the content; a D/A circuit which converts an output from the level shifter circuit into an analog voltage to drive the signal wirings; and a waveform shaping circuit provided on the first buses between the plurality of blocks, for shaping digital waveform.