| 摘要 |
A projector including a lens, an IR emission circuit, an IR reception circuit and a central processing circuit is provided. The projector is controlled by a first infrared ray (IR) signal provided by a remote controller. The IR emission circuit emits a second IR signal to detect whether an obstacle is positioned on an optical path of the projection light. When an obstacle is positioned on the optical path, the second IR signal is reflected to the IR reception circuit via the obstacle. The IR reception circuit provides a first and a second output signal in response to the first and the second IR signal respectively. The central processing circuit determines that an obstacle is positioned on the optical path and accordingly alters an operational mode of the projector in response to the second output signal and controls the operation of the projector in response to the first output signal.
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