Patent ID: 9735569
Date: 2017-08-15
CPC Classifications: G09G,H02H

Claim:
1. A driving circuit applied in a display system, comprising: a node, arranged for connecting a lighting element; a current control circuit, coupled to the node, arranged to selectively provide a current to the lighting element according to a Pulse Width Modulation (PWM) signal; a protecting circuit, coupled to the node, arranged to be selectively enabled to limit a voltage of the node according to a control signal to make the voltage of the node maintain a predetermined voltage, wherein the lighting element does not have any current passes through when the voltage of the node maintains the predetermined voltage; a timing controller, arranged to generate the PWM signal and the control signal; wherein when a level of the PWM signal generated by the timing controller starts to change to make the current control circuit stop providing current to the lighting element, the timing controller generates the control signal to enable the protecting circuit to limit the voltage of the node; and when the level of the PWM signal generated by the timing controller starts to change to make the current control circuit start to provide the current to the lighting element, the timing controller generates the control signal to disable the protecting circuit to make the voltage of the node not be controlled by the protecting circuit.