| 摘要 |
The present invention may provide a reference voltage generation circuit, a display driver circuit, a display device, and a method of generating a reference voltage which can be multi-purposely used without increasing the circuit size, irrespective of the type of display device. A reference voltage generation circuit 48 includes first to third resistance ladder circuits 70,72,74. The first resistance ladder circuit 70 has at least one variable resistance circuit in which a resistance value between both ends is variable, and outputs multi-valued reference voltages. The second resistance ladder circuit 72 has series-connected resistance circuits each of which has a fixed resistance value, and outputs a plurality of reference voltages. The third resistance ladder circuit 74 has at least one variable resistance circuit in which a resistance value between both ends is variable, and outputs multi-valued reference voltages. The first to third resistance ladder circuits 70, 72, 74 are connected in series between first and second power supply lines. The resistance values of the variable resistance circuits in the first and third resistance ladder circuits 70, 74 are variably controlled by a given command or a variable control signal input through an external input terminal. <IMAGE> |
