Patent ID: 8624522

Claim:
A backlight control circuit, comprising: a driver circuit that adjusts an illumination intensity of a backlight source; a sensing circuit that senses an environmental illumination intensity; and a control circuit set between the driver circuit and the sensing circuit, and controlling the driver circuit to adjust the illumination intensity of the backlight source according to the sensed environmental illumination intensity; wherein when the environmental illumination intensity increases, current input to the sensing circuit is increased, and the control circuit controls the driver circuit to increase the illumination intensity of the backlight source; when the environmental illumination intensity decreases, the current input to the sensing circuit is decreased, and the control circuit controls the driver circuit to decrease the illumination intensity of the backlight source; the driver circuit includes a driver integrated circuit (IC) and a feedback resistor; the driver IC includes an input terminal, an output terminal and a feedback terminal; the input terminal is connected to a power supply, the output terminal is connected to one end of the backlight source and provides power to the backlight source, another end of the backlight source is grounded; the feedback terminal is connected to the another end of the backlight source by the feedback resistor, when a voltage detected by the feedback terminal is pulled down, the current input to the sensing circuit is decreased; when a voltage detected by the feedback terminal is pulled up, the current input to the sensing circuit is increased.