Bias voltage module for driving liquid crystal display device

The utility model relates to an offset voltage module, comprising a reference power supply D#-[1], a single-chip microcomputer U#-[6], a voltage peak value adjusting potentiometer R#-[3], a digital potentiometer R#-[1], a digital potentiometer R#-[2], a voltage amplifier U#-[1], a voltage amplifier U#-[2], a voltage amplifier U#-[3], a differential amplifier U#-[4], a differential amplifier U#-[5] and a resistance-capacitance compensation circuit RC. The arrangement of the bias voltage, which is realized by making use of the voltage division effect of the digital potentiometer, provides simple circuit connection, small systematic error, high accuracy and good system stability, and the modularization is provided with good transplantation performance and embeddability. For the bias voltage ratio is 1/2.0-1/64.0, and is continuous and adjustable, the flexibility of the system bias voltage installation is increased. The utility model can be embedded into a liquid crystal display driving chip, so as to provide the liquid crystal display driving chip with the function that the internal bias voltage can be set. The utility model is an offset voltage module with low resistance accuracy specification, small module manufacturing difficulty, low power consumption and great controllability and flexibility, and can be used in driving liquid crystal display fittings.