Patent ID: 8451210

Claim:
A backlight-source-luminance auto-adjusting system including a backlight source, comprising: a photosensitive element mounted on the backlight source, for converting a light signal into an electric signal; an amplification/conversion circuit connected to the photosensitive element, for amplifying a received analog signal and converting said analog signal into a digital signal; and a control circuit connected to the amplification/conversion circuit and the backlight source, for receiving a signal sent by the amplification/conversion circuit and adjusting the backlight source, wherein said control circuit comprises: a microprocessor for providing a control signal for adjusting the backlight source; a memory connected to the microprocessor, for storing a quantified current value corresponding to a set luminance of the backlight source, and a preset time; a receiving module connected to the microprocessor, for receiving an externally input signal; a comparison module connected to the microprocessor, for comparing a current value corresponding to the received digital signal with the quantified current value corresponding to the set luminance of the backlight source; and a control module connected to the microprocessor, for controlling a level of an input voltage to the backlight source according to the control signal from the microprocessor, adjusting the luminance of the backlight source, and automatically turning on or off the backlight source according to the control signal.