Multiplexed LCD Driver Integrated Circuits for Use with Low Cost Microcomputers

A general pupose LCD driver chip set employing a (2/3) multiplexing scheme is presented. Mask programmable options of either four (4) or (3) common backplanes are provided. A master/slave approach is employed to yield a more optimum system expansion of frontplanes. Temperature tracking of liquid crystal threshold shift can readily be implemented off chip. Internal clock timing can be generated by either an on board oscillator circuit or an external clock source.