If public speaking is an art, then one of its key tools is the portable projector. Thankfully the days of the slide projector are long past and today's offerings have plenty of features for businesspeople who make presentations on the go.
The three main types of projectors are liquid crystal display (LCD), digital light processing (DLP) and liquid crystal as silicon (LCOS). LCD projectors are the oldest of the three technologies. They operate by shining...
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