Patent ID: 7175288

Claim:
A projector, comprising: a lamp for emitting a light ray; a ballast for staffing the lamp and selectively supplying an operating power and a blanking power to the lamp; a micro controller unit for controlling the ballast; and an optical engine for receiving the light ray and outputting a projecting image to a screen outside the projector, wherein when the projector enters a blanking mode from a normal operating mode, the micro controller unit outputs a control signal to the ballast, and a power supplied from the ballast to the lamp switched from the operating power to the blanking power; wherein the projector is a digital light processing (DLP) projector, the optical engine comprises a digital micro-mirror device (DMD), when the projector is in a normal mode, the light ray emitted from the lamp is reflected by the DMD and projected onto the screen, and when the projector enters the blanking mode, the DMD reflects the light ray from the lamp to an inner wall of the optical engine.