Patent ID: 8564524

Claim:
A signal controlling circuit, for controlling a display panel, wherein a plurality of scan lines is disposed on the display panel for respectively receiving a corresponding scan signal, and each of the scan lines is coupled to a plurality of the pixels disposed on the display panel, the signal controlling circuit comprising: a first comparison feedback unit, coupled to two of the scan lines, for receiving the corresponding scan signals and outputting a first calculation signal, wherein the first comparison feedback unit comprises: a logic circuit, for receiving two of the scan signals and outputting a logic signal; and a buffer amplifier module, coupled to the logic circuit, for receiving the logic signal and generating the first calculation signal, wherein the buffer amplifier module comprises: a first transistor, having a first source/drain receiving a voltage source and a gate receiving the logic signal; a second transistor, having a first source/drain and a second source/drain respectively receiving a voltage signal and the voltage source, and a gate coupled to the gate of the first transistor; a third transistor, having a first source/drain receiving the voltage signal, a gate and a second source/drain respectively coupled to the gate and a second source/drain of the first transistor; a first capacitor, having one end coupled to the second source/drain of the first transistor and another end coupled to the ground; a first operational amplifier, having a positive input terminal coupled to the second source/drain of the first transistor and a negative input terminal receiving the voltage signal; and a buffer amplifying circuit, disposed between the first transistor and the first operational amplifier, for delaying transmitting time of signals; a second comparison feedback unit, coupled to one of the scan lines other than the two scan lines coupled to the first comparison feedback unit, for receiving the corresponding scan signal and outputting a second calculation signal; and a calculation unit, for receiving the first calculation signal and the second calculation signal, and determining whether or not to enable a control signal every a predetermined time, wherein when the control signal is enabled, one of the scan lines is enabled.