Edge-type backlight module and liquid crystal display using the same

An edge-type backlight module, comprising:

• a printed circuit board comprising a supporting surface;
• a plurality of light emitting diodes disposed on a left part of the supporting surface, each of the light emitting diodes comprising a light emitting surface and light emitted by the light emitting diode being emitted from the light emitting surface;
• a reflective film disposed on a right part of the supporting surface;
• a light guide plate disposed above the reflective film so that the reflective film being disposed between the light guide plate and the supporting surface;
• a reflective surface disposed on a side edge of the light guide plate and being kept a distance from the light emitting diode, the reflective surface being used for reflecting the light emitted from the light emitting surface;
• and
• an absorbing surface disposed on the supporting surface and beside the light emitting diode for absorbing the light reflected by the reflective surface, the absorbing surface is disposed on the supporting surface and between every two of the adjacent light emitting diodes, the absorbing surface is made of a colloid substance or a soft tape wherein colors of the colloid substance and the soft tape are black color or gray color, the absorbing surface is disposed on the supporting surface and between the light emitting diode and the reflective film, a thickness of the thermally conductive tape is equal to or larger than a thickness of the reflective film, the absorbing surface further comprises:
• a first tape disposed between the supporting surface and the reflective film and located on a side near the light emitting diode, a width of the first tape is equal to or smaller than a distance from the light emitting diode to an edge of a right part of the supporting surface, the first tape comprises a hole used to avoid touching with a locking element disposed between the printed circuit board and the reflective film;
• a second tape disposed between the light guide plate and the first tape, a width of the second tape is equal to or smaller than a distance from the light emitting diode to the reflective film, a thickness of the second tape is equal to or larger than a thickness of the reflective film, the second tape is gray;
• and
• the locking element penetrating through a right side of the printed circuit board and disposed under the reflective film for securing the printed circuit board.