A display device includes a liquid crystal display panel, a backlight module, a control circuit, a driving module, and a waveform generator. The liquid crystal display panel includes a plurality of liquid crystal pixels. The backlight module generates the backlight required by the liquid crystal display panel, and the backlight module includes a plurality of backlight blocks. The control circuit determines a backlight intensity corresponding to each backlight block in a frame period according to an input display data and generates a control signal according to the backlight intensities corresponding to the backlight blocks. The driving module generates a plurality of driving signals to the backlight module in the frame period according to the control signal. The waveform generator generates a de-blur pulse signal to the backlight module. When the de-blur pulse signal is at a high voltage, the backlight blocks emit lights according to the driving signals.