In the back light efficient side emitting the most attract sb.'s attention, LED as the LCD backlight application, has the advantages of long service life, high luminous efficiency, no interference and the performance to price ratio higher characteristic, has been widely used in electronic watches, mobile phone, pager, electronic calculators and card reading machine, with the portable electronic products become small, LED backlight more the advantage, therefore backlight production technology will develop to a thin, low power consumption and uniform consistency. LED is a key device of mobile phone, an ordinary mobile phone or PHS about using 10 LED devices, and a color screen and mobile phone with camera function requires the use of only about 20 LED devices. At the present stage, cell phone backlight dosage is very large, a year to use 3500000000 LED chip. China mobile phone production quantity is very large at present, and most of the LED back light source for domestic or imported, LED products, this is an excellent market opportunities