The present invention provides a backlight module, containing an edge-lit backlight source; a light guide plate having a light incident surface and a light emitting surface where the light incident surface faces directly towards the backlight source; an optical film set positioned on a top side of the light guide plate facing directly towards the light emitting surface of the light guide plate; a reflection plate on a bottom side of the light guide plate; and a thermal conductive layer on a bottom side of the reflection plate conducting heat produced from the backlight source at least to the center of the reflection plate. The backlight module raises the temperature in the center of the panel, thereby preventing the cross talk resulted from having lower temperature in the center of the panel. There is no significant change to the existing backlight modules and therefore the cost is low.