BACKLIGHT REGULATION CIRCUIT AND LIQUID CRYSTAL DISPLAY

摘要

The present disclosure provides a backlight regulation circuit and a liquid crystal display having the same. The backlight regulation circuit includes a PWM signal generating module, a D/A conversion module, and a current driving module. The PWM signal generating module is configured for generating a PWM signal and outputting the PWM signal to the current driving module; the D/A conversion module receives an operation command inputted by user and outputs a preset voltage to the current driving module according to the operation command; the current driving module receives the PWM signal, amplifies the PWM signal according to the preset voltage, and outputs the amplified PWM signal to an electrical switch in control of switch-on and switch-off of a backlight, thereby controlling the switch-on and switch-off of the backlight. The present disclosure integrates multiple LED backlight schemes, expands the application range of the backlight regulation circuit, and shortens the development cycle.

主权项

1. A backlight regulation circuit, comprising a pulse-width-modulation (PWM) signal generating module, a digital-to-analogy (D/A) conversion module, and a current driving module;
the PWM signal generating module being configured for generating a PWM signal and outputting the PWM signal to the current driving module; the D/A conversion module receiving an operation command inputted by user and outputting a preset voltage to the current driving module according to the operation command inputted by the user; the current driving module receiving the PWM signal, amplifying the PWM signal according to the preset voltage, and outputting the amplified PWM signal to an electrical switch which is in control of switch-on and switch-off of a backlight, thereby controlling the switch-on and switch-off of the backlight.