Light emitting diode driving circuit for reducing flicker effect

A light emitting diode (LED) driving circuit for driving an LED unit, the LED unit comprising at least one LED, the LED unit having an input node and an output node, the LED driving circuit comprising:

• a power source, coupled to the input node of the LED unit;
• a detection circuit, coupled to the output node of the LED unit, wherein the detection circuit is arranged to generate a detection signal according to an output signal of the LED unit;
• a charging-discharging circuit, comprising:
• a resistive circuit, having a first node and a second node;
• a first diode, having an anode and a cathode, wherein the first diode is coupled to the resistive circuit in parallel;
• and
• an energy storing circuit, having a first node and a second node, wherein the first node of the energy storing circuit is coupled to the second node of the resistive circuit and the anode of the first diode;
• the second node of the energy storing circuit is coupled to the output node of the LED unit;
• when a charging path is enabled, the first node of the resistive circuit is coupled to the power source, and the energy storing circuit is charged via the power source, the resistive circuit and the charging path;
• and when a discharging path is enabled, the cathode of the first diode is coupled to the LED unit, and the energy storing circuit is discharged via the discharging path, the first diode and the LED unit;
• and
• a control circuit, coupled to the detection circuit, the charging path and the discharging path, wherein the control circuit is arranged to selectively enable the charging path or enable the discharging path according to the detection signal, wherein the control circuit comprises:
• a switch, having a first node, a second node and a control node, wherein the first node of the switch is coupled to the charging path, and the second node of the switch is coupled to the discharging path;
• a voltage divider circuit, having a first node, a second node and a connection node, wherein the first node of the voltage divider circuit is coupled to the charging path, and the connection node is coupled to the control node of the switch;
• and
• a first transistor, having a first node, a control node and a second node, wherein the first node of the first transistor is coupled to the second node of the voltage divider circuit, the control node of the first transistor is coupled to the detection circuit, and the second node of the first transistor is coupled to the reference potential.