US Patent 10034341 Adaptive backlight device, system and control method thereof

An adaptive backlight device includes a transistor, a voltage detector and an adaptive controller. The transistor is configured to control the current flowing through a light string. The transistor provides a first voltage signal and a second voltage signal. The voltage detector generates a voltage difference signal according to the first voltage signal and the second voltage signal. The adaptive controller receives the voltage difference signal from the voltage detector. The adaptive controller includes a counter. When the adaptive controller determines that the voltage difference signal is larger than or equal to a predetermined value, the adaptive controller increases the current flowing through the light string at least once via the control end of the transistor to increase the cross voltage of the light string and decrease the cross voltage of the transistor.