An anti-flicker circuit for an LED direct driver under low input voltage operation, the LED direct driver at least having a current source, and the anti-flicker circuit comprises a first path having a first resistor, a second path having a second resistor, a filter capacitor and a comparator having a reference voltage. The filter capacitor is connected to the first path, the second path and the current source of the LED direct driver, and discharges current via the first path. The comparator charges the filter capacitor to the current source via the second path when a voltage of the current source is below the reference voltage, wherein the RC time constant of the first path and the filter capacitor in combination with the second path and the filter capacitor is slower than a period of the flicker. As long as the RC time constant is long enough, then the changes in light output will occur slowly enough so that the deleterious effects for the flicker are eliminated.