Abstract: A projector includes a main body, sub-body having an optical engine system, and a telescopic electric suspension arm, of which a first end is fixed in the main body, and a second end is connected to the sub-body. When the electric suspension arm retracts, the projector is in a closed position, where the sub-body and the electric suspension arm are both placed in the main body; and when the electric suspension arm extends, the projector is in an open position, and the sub-body moves out from the main body.