As the luminescence efficiency of LED is being improved by a large margin, and has the Characteristics, such as high exquisiteness degree , high brightness , has no mercury , high color represent probability, long- lived ,etc. That meet the request of energy-conservation , simple, light and thin for LCD products systematic engineering and high uniformity degree , high brightness degree for vision engineering.It can give liquid crystal panel higher additional value. LED is becoming the major device in back light lighting application of medium and small-scale colored display. Several kind of LED side backlight product in our company mainly as follows: 1) The stick of SMD LED +PCB circuit board is put on the guide light board border and enters the light; 2) Plug-in package LED LAMP is put by the side of the guide light board directly and enters the light; 3) Plug-in package of LED LAMP +PCB circuit board is put on the guide light board border and enters the light; 4) Strip support LED is put on the guide light board border directly and enters the light; 5) Chip +PCB circuit board is put on the guide light board border and enters the light . The color of LED side back light is abundant , there are many kinds of monochromatic and polygenetic products , such as white , blue , green , yellow , red , orange ,etc.. The degree of exquisiteness of the products is more than 80%. The thickness of finished product is 0.7-4.0mm.