A backlight module is provided. The backlight module comprises a light source and a back bezel. The light source includes at least one high voltage electrode terminal. The back bezel is positioned at a rear portion of the light source. The back bezel is formed with at least an opening at a lower portion thereof. At least a part of the opening faces a rear portion of the high voltage electrode terminal. The back bezel is capable of changing the temperature distribution of the light source to allow more lamps operate under a better working temperature, thereby stabilizing the operational quality of the backlight module and prolonging its service life.