Packing box for liquid crystal display panel and waterproof structure thereof

A packing box for a liquid crystal display panel, comprising:

• a bottom plate having inner and outer surfaces, a side wall, a plurality of openings disposed in the bottom, plate, and, a plurality of first tongue and groove engagement members arranged on the inner surface;
• a cushion member comprising top and bottom surfaces, the bottom surface of the cushion member having a plurality of corresponding second groove and tongue engagement members corresponding to the plurality of first tongue and groove engagement members;
• wherein the cushion member is placed on top of the inner surface of the bottom plate so as to have the plurality of first tongue and groove engagement members to create a waterproof seal with the plurality of second groove and tongue engagement members;
• and
• wherein the plurality of openings disposed in the bottom plate comprises four openings arranged symmetrically in a 2×2 matrix and is encompassed within the plurality of first tongue and groove engagement members.