Abstract: An illumination device includes a transformer, a protection circuit, and a cold cathode fluorescent lamp (CCFL) tube. The transformer is for converting a first alternating current power to a second alternating current power. The protection circuit includes a relay and an over-voltage detecting circuit. The relay is coupled to a first end of the transformer, and the relay includes a contact pin, the contact pin is electrically connected to the first end when the relay is turned off, and the contact pin is electrically disconnected from the first end when the relay is turned on. The over-voltage detecting circuit is for turning on the relay when the second alternating current power is over a predetermined value, and for turning off the relay when the second alternating current power is below the predetermined value. The CCFL tube is electrically connected between the contact pin and a second end of the transformer.