| 摘要 |
A color wheel includes a motor defining a rotating portion, a color filter, a sensor and a processor electrically connected to the sensor. The rotating portion defines a groove at the periphery of the rotating portion to aid the sensor in detecting a color index position of the color filter during transmission of light beams to the rotating portion from the sensor. When portions of light beams are striken the groove of the rotating portion, they are substantially absorbed by the groove and cannot be reflected back to the sensor, thereby the sensor can accurately detect the color index position of the color filter during the rotation of the color filter.
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