Patent ID: 6943784

Claim:
A control circuit of panel brightness, which responds to an adjustment signal to adjust a panel brightness, comprises: a pre-stage circuit, for receiving the adjustment signal to obtain a darkness-adjusting signal and a brightness-adjusting signal, the pre-stage circuit further outputting an enable signal related to the darkness-adjusting signal and the brightness-adjusting signal; a first brightness control circuit, for outputting an adjusted first brightness value and receiving the first brightness value, the first brightness control circuit controlled by the enable signal, the darkness-adjusting signal and the brightness-adjusting signal, wherein the first brightness value is obtained according to the related first brightness value and an interval; and a second brightness control circuit, for outputting an adjusted second brightness value, and receiving a second brightness value, the second brightness control circuit controlled by the enable signal, the darkness-adjusting signal and the brightness-adjusting signal, wherein the second brightness value is obtained according to the second brightness value and an interval; wherein the first brightness value and the second brightness value are used for adjusting panel brightness.