The utility model discloses a
sidelight type LED backlight module which comprises an upper
diffusion film, an upper
prism brightness enhancement film, a lower
prism brightness enhancement film, a lower
diffusion film, a
light guide plate, a reflector plate and LED light sources, the
light guide plate is arranged on the reflector plate, a packaging structure is arranged on one side of the
light guide plate, a plurality of hemispherical cavities which are arranged in the same row and can contain the LED light sources are formed in the packaging structure, and the LED light sources are arranged in the hemispherical cavities. The LED
light source is arranged in the semispherical cavity, light emitted by the LED
light source is emitted to the light guide plate through the top of the semispherical cavity, the other side of the light guide plate is provided with a reflection slope arranged upwards, the area of the top face of the light guide plate is larger than that of the bottom face of the light guide plate, and the reflection piece is matched with the bottom face of the light guide plate. The lower
diffusion film is arranged on the light guide plate and is matched with the top surface of the light guide plate, the lower
prism brightness enhancement film is arranged on the lower diffusion film, the upper prism brightness enhancement film is arranged on the lower prism brightness enhancement film, and the upper diffusion film is arranged on the upper prism brightness enhancement film. The
LED lamp has the characteristics of uniform brightness and high brightness.