Two-sided luminous back light source

The utility model discloses a double-face shining back light source, comprising a LED luminant, a light guiding plate, a rubber frame for limiting the light guiding plate, a lower spreading membrane and a lower light adding membrane positioned on the lower underside of the light guiding plate, and an upper spreading membrane and an upper light adding membrane positioned on the upper surface of the light guiding plate. The utility model is characterized in that the aforesaid back light source is a single light guiding plate, the lower surface of the aforesaid light guiding plate is a concave pit, or a raised dot shape or a line decorative design; the concave pit or the decorative design are arranged in an array shape according to the rule of big to small. The super surface of the light guiding plate is made as a grind face, or a mirror face or a discharging face, and the distribution rule of the concave pit or the heave on the surface of the aforesaid light guiding plate is: the concave pit or the heave is mor