Abstract: A voltage compensation circuit includes a voltage detection unit, a digital comparison correction unit, and a voltage adjustment unit. The voltage detection unit detects input voltage of the gate driver and conducts the input voltage to the digital comparison correction unit. The digital comparison correction unit compares the input voltage with reference voltage supplied by a controller for generating a correction controlling signal and conducting the correction controlling signal to the voltage adjustment unit. The voltage adjustment unit adjusts the input voltage and outputs a target voltage according to the correction controlling signal. The gate driver conducts the target voltage to an LCD panel. In this way, a scanning voltage conducted to a gate driver is adjusted. Therefore, a voltage drop will not exist between output voltages of different gate drivers, not only preventing mura from occurring in the LCD panel but also improving display quality of the LCD panel.