LED backlight source for medium and large-sized ultrathin highlight tablet computer

The invention discloses an LED backlight source for a medium and large-sized ultrathin highlight tablet computer. The LED backlight source comprises blue PET, a reflective sheet, a plastic frame, a light guide plate, an LED assembly, single-sided plastic, lower diffusion paper, a lower brightening part, an upper brightening part, an upper diffusion part, shading plastic and an iron frame. The lower diffusion paper, the lower brightening part, the upper brightening part, the upper diffusion part and the shading plastic are sequentially arranged on the light guide plate; and the reflective sheetand the blue PET are sequentially arranged below the light guide plate. The reflective sheet is integrated at the lower end of the light guide plate, the light guide plate is fixedly mounted in the plastic frame through buckles, and the plastic frame is fixedly mounted on the iron frame through screws. By optimizing structural design and improving a processing technology, brightness of the backlight source can be effecti