Backlight module and liquid crystal display device

1. A backlight module, comprising:

a back plate,

a frame,

a light source, and

a diffusion plate, wherein the diffusion plate is connected with and fixed to the frame or the back plate by hold structures that impose a tension effect on the diffusion plate,

wherein each of the hold structures includes a tapered via hole and a tapered protrusion, and the tapered protrusion passes through the tapered via hole.

2. The backlight module of claim 1 , wherein the tapered via hole is provided on an edge portion of the diffusion plate, and the tapered protrusions are formed on the frame.

3. The backlight module of claim 2 , wherein a via hole or groove for accommodating a portion of the tapered protrusion protruding from the tapered via hole is further provided on a periphery of the back plate.

4. The backlight module of claim 1 , wherein the tapered via hole is formed in an edge portion of the diffusion plate, and the tapered protrusion is formed on a periphery of the back plate.

5. The backlight module of claim 4 , wherein a via hole or groove for accommodating a portion of the tapered protrusion protruding from the tapered via hole is further provided on the frame.

6. The backlight module of claim 1 , wherein the hold structures are located at one side of the backlight module, and a fixing device for fixing the diffusion plate is provided on a side opposite to the side of the hold structures on the backlight module.

7. The backlight module of claim 1 , wherein the hold structures are symmetrically disposed on both opposite sides of the backlight module.

8. The backlight module of claim 1 , wherein at least two hold structures are disposed on each side of the backlight module.

9. A liquid crystal display device, comprising:

a backlight module, and

a liquid crystal panel, wherein the backlight module is the backlight module according to claim 1 .