A BLU includes a plastic frame, a heat-dissipating plate, an LED light bar, a light guide, and an optical film. The plastic frame includes a first horizontal part and a first vertical part connected with the first horizontal part. The heat-dissipating plate includes a second horizontal part and a second vertical part. A first through hole penetrating the first horizontal part and the first vertical part is set on the plastic frame. A hook is set on the end of the second vertical part. The second vertical part is close to the first vertical part and the hook clasps the first horizontal part.
1. A backlight unit comprising: a plastic frame; a heat-dissipating plate; an LED light bar; a light guide; and an optical film, wherein the plastic frame comprises a first horizontal part and a first vertical part connected with the first horizontal part, the heat-dissipating plate comprises a second horizontal part and a second vertical par, a first through hole penetrating the first horizontal part and the first vertical part is set on the plastic frame, a hook is set on the end of the second vertical part, the second vertical part is close to the first vertical part, and the hook clasps the first horizontal part.
2. The backlight unit of claim 1 , wherein the plastic frame further comprises at least a second through hole set on the first vertical part, and the heat-dissipating plate comprises a protrusion set on an outer wall of the second vertical part, wherein the protrusion is embedded in the second through hole.
3. The backlight unit of claim 1 , wherein the plastic frame further comprises at least a notch set on the first vertical part, and the recess is set next to the first through hole on the length direction of the first vertical part.
4. The backlight unit of claim 3 , wherein the recesses are set on the both sides of the first through hole.
5. The backlight unit of claim 1 , wherein the second horizontal part comprises a heat-conductive plate set on the top surface of the second horizontal part.
6. The backlight unit of claim 1 , wherein an end of the first horizontal part close to the first through hole is a guiding bevel.
7. The backlight unit of claim 6 , wherein the first horizontal part comprises a rib set on the end of the first horizontal part close to the first through hole, wherein the hook clasps the top surface of the rib via the guiding bevel.
8. The backlight unit of claim 1 , further comprising a fastening, wherein the fastening penetrates the first vertical part and the second vertical part in order and fixes the plastic frame and the heat-dissipating plate.
9. The backlight unit of claim 2 , wherein an end of the first horizontal part close to the first through hole is a guiding bevel.
10. The backlight unit of claim 9 , wherein the first horizontal part comprises a rib set on the end of the first horizontal part close to the first through hole, wherein the hook clasps the top surface of the rib via the guiding bevel.
11. The backlight unit of claim 3 , wherein an end of the first horizontal part close to the first through hole is a guiding bevel.
12. The backlight unit of claim 11 , wherein the first horizontal part comprises a rib set on the end of the first horizontal part close to the first through hole, wherein the hook clasps the top surface of the rib via the guiding bevel.
13. The backlight unit of claim 4 , wherein an end of the first horizontal part close to the first through hole is a guiding bevel.
14. The backlight unit of claim 13 , wherein the first horizontal part comprises a rib set on the end of the first horizontal part close to the first through hole, wherein the hook clasps the top surface of the rib via the guiding bevel.
15. The backlight unit of claim 2 , further comprising a fastening, wherein the fastening penetrates the first vertical part and the second vertical part in order and fixes the plastic frame and the heat-dissipating plate.
16. The backlight unit of claim 3 , further comprising a fastening, wherein the fastening penetrates the first vertical part and the second vertical part in order and fixes the plastic frame and the heat-dissipating plate.
17. The backlight unit of claim 4 , further comprising a fastening, wherein the fastening penetrates the first vertical part and the second vertical part in order and fixes the plastic frame and the heat-dissipating plate.
18. The backlight unit of claim 5 , further comprising a fastening, wherein the fastening penetrates the first vertical part and the second vertical part in order and fixes the plastic frame and the heat-dissipating plate.