Abstract: Since light emitting diode (LED) has the features such as long lifetime, wide spectrum, low power consumption and environmental friendly, LED is increasingly used to replace CCFL (cold cathode fluorescent lamp, whose light source contains mercury gas) as the light source in the backlight module. A 2inch LED backlight module using the structure of single-source vertex angle incident was designed. Considering that the LED light source usually causes the uneven brightness because it is a point source, the methods of LED incident angle rotation and regional segmentation were adopted, and the phenomenon of uneven brightness existing in the LED crystal backlight module was effectively eliminated. The simulation result shows that the uniformity of the outgoing light reaches 80.06%.