Patent ID: 6211849
Filing Date: 2001-04-03
Classification: G09G

Abstract:
A liquid crystal display device comprising:a liquid crystal panel having a matrix array of liquid crystal pixels, a plurality of scanning lines respectively formed along rows of said liquid crystal pixels, and a plurality of signal lines respectively formed along columns of said liquid crystal pixels;wherein said liquid crystal panel includes a glass plate on which said signal lines are formed; anda driving circuit for driving each of said scanning lines to select one of the rows of the liquid crystal pixels and including at least a signal line driver, the signal line driver being adapted to sequentially drive said signal lines to control voltages across the selected rows of liquid crystal pixels;wherein said signal line driver includes a plurality of interconnected driver ICs, said driver ICs being formed of bare semiconductor chips connected in cascade by inter-module wirings formed on said glass plate, each IC being configured for driving a predetermined number of the signal lines; andwherein said plurality of driver ICs are configured to transmit at least clock and display signals, each driver IC including:a clock waveform shaping circuit configured for regulating a duty ratio of the clock signal;a first transmission path for (i) supplying the clock signal to the clock waveform shaping circuit, thus producing a regulated clock-signal, and (ii) providing the regulated clock signal to a clock line of the inter-module wirings as an input to a next one of said plurality of driver ICs; anda second transmission path for sequentially obtaining voltages of the display signal in synchronism with the clock signal and supplying the obtained voltages of the display signal to the predetermined number of signal lines.