Design of Automatic Dimming System of LCD Backlight

An automatic dimming system of backlight for LCD is introduced.When the brightness of environment is changed,the system will adjust the brightness of background automatically so that the ratio of LCD brightness to environment brightness is the best.The working principles,hardware and process control ideas of the system are introduced.The experiment shows that the system can meet the requirement of dimming LCD brightness.The system can be widely used in the products including LCD.