Abstract: A projection apparatus including a liquid crystal on silicon panel and a processor is provided. The liquid crystal on silicon panel is configured to display a plurality of phase images. The phase images include a first phase image and a second phase image. The processor is coupled to the liquid crystal on silicon panel. The processor is configured to generate and output the phase images to drive the liquid crystal on silicon panel to display the phase images. The processor generates the first phase image according to a first phase information, and the processor generates the second phase image according to the first phase image.

Abstract: An oil-retaining structure for fan comprises an oily bearing with a central axis hole for pivoting a fan shaft. An oil-collecting recess trench is formed on an inside wall of the central axis hole. There is an acute angle oil-guiding ring edge correspondingly formed at one side of the oil-collecting recess trench. When the fan rotates, lubricant inside the oily bearing is upwardly sucked and blocked by the acute angle oil-guiding ring edge, and returns to the oil-collecting recess trench so as to construct an internal-recycle oil-retaining system.

Abstract: An oil-retaining structure for fan comprises an oily bearing with a central axis hole for pivoting a fan shaft. An oil-collecting recess trench is formed on an inside wall of the central axis hole. There is an acute angle oil-guiding ring edge correspondingly formed at one side of the oil-collecting recess trench. When the fan rotates, lubricant inside the oily bearing is upwardly sucked and blocked by the acute angle oil-guiding ring edge, and returns to the oil-collecting recess trench so as to construct an internal-recycle oil-retaining system.