Patent ID: 6448976
Filing Date: 2002-09-10
Classification: G09G

Abstract:
A liquid crystal drive device for converting display data represented by pixel data pieces synchronized with clock signals into liquid crystal applied voltages, comprising:a plurality of driving lines each of which is coupled to each column of a liquid crystal panel to output said liquid crystal applied voltage to the coupled column for driving one pixel corresponding to the coupled column and a selected row of said liquid crystal panel; and a hold unit which latches said pixel data pieces sequentially according to said clock signals inputted therein for holding said pixel data pieces for one horizontal line of said display data, wherein said hold unit holds said pixel data pieces so that said hold unit allows an identical pixel data piece to be outputted to a plurality of driving lines in accordance with multiscan control signals, said multiscan control signals being synchronized with said clock signals and commanding conversion of said display data, and said hold unit outputs to each of said driving lines said liquid crystal applied voltage of said pixel data piece corresponding to said driving line concerned, wherein said hold unit includes a latch address controller which generates at least one address of said driving lines for one pixel data piece, according to said multiscan control signals inputted therein synchronously with said clock signals used for latching said one pixel data piece, and correlates said one pixel data piece with at least one of said driving lines specified by said at least one address thus generated, wherein said hold unit latches two adjacent pixel data pieces in parallel according to said clock signals inputted therein, and said latch address controller generates addresses of three adjacent driving lines for said two adjacent pixel data pieces, when said multiscan control signals inputted therein synchronously with said clock signals used for latching said two adjacent pixel data pieces represent command data for specifying a conversion of two pixel data pieces to three pixels.