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In contrast, a modern LCD or DLP projector often uses an Ultra-high-performance lamp which has a higher luminous efficacy and lasts for thousands of hours. [5] A drawback of that technology is the warm up time required for such lamps. Older overhead projectors used a tubular quartz bulb which was mounted above a bowl-shaped polished reflector.
A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens , but some newer types of projectors can project the image directly, by using lasers .
An LCD projector is a type of video projector for displaying video, images or computer data on a screen or other flat surface. It is a modern equivalent of the slide projector or overhead projector .
Document cameras, also known as visual presenters, visualizers, digital overheads, or docucams, are high-resolution, real-time image capture devices used to display an object to a large audience, such as in a classroom or a lecture hall, or in online presentations such as webinars. A webcam is mounted on arms, allowing it to be positioned over ...
A Forest Park resident shovels his driveway as a second round of snow falls on Monday, Jan. 6, 2025. According to the National Weather Service in Wilmington, the 8.4 inches of snow recorded in ...
You can get TurboTax for 30% off on Amazon today. See all deals. In Other News. Entertainment. Entertainment. People. Paris Hilton volunteers at shelter for animals impacted by LA fires and boosts ...
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