LCD device and driving method of its backlight module

The present invention discloses a method for driving a liquid crystal display device and a backlight module. The liquid crystal display device includes a display panel and a backlight module. The backlight module includes a first light source, second light source and a driving circuit. When the liquid crystal display device in the normal display mode, a first driving circuit for driving the light source, the backlight module to provide a first display panel to the backlight. When the liquid crystal display device is switched to the black insertion display mode, the drive circuit simultaneously drives the first and second light sources to the backlight module provides a backlight to the display panel mixed. Color temperature and luminance of the mixed color temperature and luminance of the backlight is different from the first backlight of the liquid crystal display device to display the color temperature and interpolation display luminance in black display mode, substantially identical to the color temperature of the liquid crystal display device in the normal display mode and display brightness.