Patent ID: 8089427

Claim:
A display control circuit for controlling a plurality of display units of a Vacuum Fluorescent Display and comprising: an image signal generator, generating a plurality of image signals; a clock signal generator, comprising: a reference clock signal generator, providing a reference clock signal; a reset signal generator, providing a reset signal; a plurality of flip-flops coupled in series; and a plurality of logic gates, wherein: each of the flip-flops comprises a reset signal input terminal receiving the reset signal, a clock signal input terminal, a first output terminal and a second output terminal; a first one of the flip-flops is coupled to the reference clock signal generator to receive the reference clock signal via the clock signal input terminal thereof, and outputs a first clock signal at the first output terminal and the second output terminal thereof, and the second output terminal of the first one of the flip-flops outputs the first clock signal to the clock signal input terminal of a second one of the flip-flops; the rest of the flip-flops are serially coupled to the second one of the flip-flops by the same structure coupling the first one and the second one of the flip-flops; and the first output terminals of all flip-flops are coupled to the logic gates to generate a clock signal; and a plurality of control signal generators, coupled to the image signal generator to receive the image signals, respectively, and all coupled to the clock signal generator to receive the clock signal, wherein each of the control signal generators generate a control signal according to the received image signal and clock signal, and the control signals generated by the control signal generators to control the plurality of display units are of different duty cycles.