The invention discloses a backlight module, comprising a light guide board and a plurality of light emitting elements. The light guide board comprises a light-in surface and a light-out surface, wherein the light-out surface is provided with a visible region. The light emitting elements are arranged on the light-in surface of the light guide board, wherein each light emitting element comprises a light emitting surface and an optical axis vertical to the light emitting surface. The optical axes are approximately crossed at a central point of the visible region.