Backlight unit

A backlight unit comprising:

• a middle frame;
• a reflector disposed in the middle frame;
• a light guide plate provided on a surface of the reflector;
• and
• an LED light strip disposed at one side of the middle frame and opposite to a side edge of the light guide plate,
• wherein the middle frame is formed with a heat radiating plate corresponding to the reflector and attached to a surface of the reflector at one side thereof,
• wherein the heat radiating plate comprises a heat radiating layer, a first cover layer and a second cover layer at two sides of the heat radiating layer, the first cover layer is opposite to the reflector, and the first cover layer is provided with a first notch for contacting a circuit board with the heat radiating layer at one side thereof adjacent to the LED light strip, and
• wherein the first notch causes the heat radiating layer to be exposed to form an exposed portion, and the circuit board and the exposed portion are attached to each other.