Segmented liquid crystal display driving circuit

The invention belongs to the technical field of LCD display, and particularly provides a segment type liquid crystal display driving circuit which comprises a band-gap reference voltage source used for providing reference voltage Vref; the voltage generation module is used for providing constant driving voltage VLCD for the bias voltage generation module, and the driving voltage VLCD and the voltage Vref are in a multiple relation; the double VCC boost charge pump circuit is used for supplying power to the VLCD generation module; the VCC voltage detection circuit is used for judging whether the charge pump circuit is started or not; and the bias voltage generation module is used for generating a partial voltage based on the constant LCD driving voltage VLCD so as to drive the liquid crystal display screen. The constant voltage driving circuit can maintain constant voltage output, so that LCD display can maintain fixed contrast and definition. The problem that the display effect of LCD display in a portable el