Backlight brightness automatic adjusting system adapting various liquid crystal panels and liquid crystal display

A liquid crystal display, comprising a backlight brightness automatic adjusting system adapting various liquid crystal panels;

• the backlight brightness automatic adjusting system adapting various liquid crystal panels comprises a liquid crystal panel, a sequence controller electrically coupled to the liquid crystal panel, a micro controller electrically coupled to the sequence controller, a plurality of LED light bars electrically coupled to the micro controller and a MOS transistor and a resistor coupled in series with each LED light bar;
• the sequence controller performs data exchange with the liquid crystal panel, and the sequence controller detects a structure or resolution information of the liquid crystal panel, and transmits the structure or the resolution information of the liquid crystal panel to the micro controller in an instruction form, and the micro controller correspondingly outputs pulse signals of various duty ratios according to various instructions obtained from the sequence controller to control a switch degree of the MOS transistor, and thus to automatically adjust a current flowing through the LED light bar and a brightness of the LED light bar;
• wherein the micro controller stores a preset data table inside, and the preset data table defines a corresponding relationship of various instructions transmitted by the sequence controller and various program codes in the micro controller, and one kind of program code corresponds to one kind of pulse signal of duty ratio.