DRIVE CIRCUIT FOR USE IN LIQUID CRYSTAL DISPLAY LIQUID CRYSTAL DISPLAY INCORPORATING THE SAME AND ELECTRONICS INCORPORATING THE LIQUID CRYSTAL DISPLAY

摘要

PURPOSE: A drive circuit for use in a liquid crystal display controller is provided, which is applicable to electronics operative without necessarily performing periodical D/A conversions and includes an adjusting circuit running on a reduced power supply for adjusting the potential differences between pixel electrodes and a common electrode and to further offer a liquid crystal display incorporating the drive circuit and electronics incorporating the liquid crystal display. CONSTITUTION: A reference voltage generator circuit(20) includes a voltage divider section(20a) provided with resistors(R11-R15 and R21-R25) for dividing the difference between the high reference voltage(VHIGH) and the low reference voltage(VLOW) into two sets. Put differently, the voltage divider section(20a) includes two groups of resistors, five resistors connected in series in each group, to perform voltage division to produce two sets of four DC voltages from the difference between the VHIGH and the VLOW. Specifically, the five resistors(R11-R15) are connected in series in this order in the first group, with the resistor(R11) being coupled to the VHIGH and the resistor(R15) being coupled to the VLOW. The resistors(R11-R15) have suitable specified resistances. The arrangement enables the first group to output, through the coupling points, DC voltages produced from the difference between the VHIGH and the VLOW through voltage division in accordance with the combined resistances from the VLOW to the coupling points. The coupling points to the resistors are connected to amplifiers(Amp21-Amp24) through switches(SW2,SW4,SW6,SW8) controlled in an interconnected manner through the signal.