An edge light LED backlight is designed in this paper. LED array is designed with rectangle type
processed with MCPCB. Boost inverter which supports over-voltage protection is used in the driver module. The brightness of LED light-bar is controlled by PWM wave produced from single-chip microcomputer in the control module. A LED backlight is designed in this paper
which has a good optical effect and supports keyboard dimming. The circuit is simple in this design. This paper can also be used for the design of medium-sized and large size LED backlight.