Backlight module and liquid crystal display device

A backlight module, comprising:

• a light source;
• a light guide plate guiding light generated from the light source;
• a back plate having edges formed with a peripheral frame perpendicular to a plane of the back plate, and carrying the light guide plate;
• a fixed retaining part mounted on the back plate and being in contact with a light input surface of the light guide plate;
• and
• an elastic retaining part having one end connected to the peripheral frame and the other end elastically connected to a surface of the light guide plate opposite to the light input surface;
• wherein the elastic retaining part includes a retaining plate, an elastic metal strip and a connecting part connecting the retaining plate to the elastic metal strip;
• the retaining plate is in contact with the surface opposite to the light input surface, and the elastic metal strip is in contact with the peripheral frame;
• wherein the connecting part is a bolt, the retaining plate is formed with a hollow convex portion which has a first through hole thereon, the elastic metal strip is formed with a second through hole, and a thread rod of the bolt passes through the first through hole and the second through hole;
• wherein a head portion of the bolt is installed within the convex portion, the diameter of the first through hole is greater than the diameter of the thread rod of the bolt, and the diameter of the first through hole is smaller than the diameter of the head portion of the bolt;
• and
• wherein an end of the thread rod of the bolt is formed with an outer thread, and the second through hole is formed with an inner thread corresponding to the internal thread.