Backlight is an important constituent part of a liquid crystal module. A main operation module of a backlight is a Light Emitting Diode (LED) driver and an LED light. Therefore, an operation voltage and operation current of the LED light are major factors which influence power consumption of the backlight.
A calculation formula of the power consumption of the backlight is: power consumption=voltage×current. The LED light is a physical element with PN junction characteristics, and as operation time elapses, current flowing through the LED light may increase with temperature increases at a constant voltage, and thus the power consumption also increases therewith.