Reference voltage generation circuit, display driver circuit, display device, and method of generating reference voltage

A reference voltage generation circuit which generates multi-valued reference voltages for generating a gamma-corrected grayscale value based on grayscale data, the reference voltage generation circuit comprising:

• a first resistance ladder circuit having at least one variable resistance circuit in which a resistance value between both ends is variable, and outputting multi-valued voltages;
• a second resistance ladder circuit in which a plurality of resistance circuits each having a fixed resistance value are connected in series, outputting a plurality of voltages;
• and
• a third resistance ladder circuit having at least one variable resistance circuit in which a resistance value between both ends is variable, and outputting multi-valued voltages,
• wherein the first to third resistance ladder circuits are connected in series between first and second power supply lines to which first and second power supply voltages are respectively supplied;
• and
• wherein the resistance values of the variable resistance circuits in the first and third resistance ladder circuits are variably controlled according to a given command setting or a given variable control signal.