Backlight adjustment circuit

The utility model relates to a backlight adjustment circuit, comprising a backlight adjustment unit (101) for generating manual adjustment signals (S1) and automatic adjustment signals (S2), a microprocessor unit (102) which is connected with the backlight adjustment unit (101) and is used for generating PWM waves (S3) based on the manual adjustment signals (S1) and automatic adjustment signals (S2), and an LED driving unit (103) which is connected with the microprocessor unit (102) and is used for controlling LED driving current (S4) based on the PWM waves (S3) provided by the microprocessor unit (102). The backlight adjustment circuit provided by the utility model can adjust LED backlight brightness in a comprehensive manner based on change of ambient light intensity and users' manual operation, and balance a display effect and energy consumption.