A backlight module comprises at least a light-guide plate, a palette device and an LED bar. The palette device comprises a palette and light-guide bar and at least one palette LED. The palette and light-guide bar is disposed at a side end of the light-guide plate and has a light-input surface, a light-output surface corresponding to the light-input surface, a first side, a second side corresponding to the first side, a top, and a bottom corresponding to the top. The palette LED is adjacent to the first side and provides a palette light into the palette and light-guide bar. The LED bar is adjacent to the light-input surface of the palette and light-guide bar. The LED bar emits an incident light, which is through the light-input surface into the palette and light-guide bar, wherein a light mixed by the incident light and the palette light is output through the light-output surface is and the side end into the light-guide plate so as to be a light source of the backlight module.