Do modern projector used for digital class works on same old conventional intermittent mechanism and blocking of light during change of frame. What is principal used in modern projector?
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Modern digital projector use a technique called DLP(digital light processing). They use an array of micromirorrs in order to point the white light source(often a bulb) that goes through a filter to become colored (red, green or blue). There is a mirror for each pixel and it direct light to the projecting lens or to an absorber depending on if the pixel should be on or not.
Here you can find a nice explanation, also YouTube is full of videos https://electronics.howstuffworks.com/dlp2.htm
Alberto Brambilla
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