Digital projectors are also called video projectors. The device helps receive a video signal after which it shows an image on a screen by virtue of using a lens-technique. Digital projectors are being used increasingly these days for classroom trainings and teachings, for giving corporate presentations, during seminars and conferences, and also as a home theater system. They are of tremendous help in highlighting the things to the audience and make training sessions and presentations quite impactful and successful.
There are different types of digital projectors. The first and the basic model of the projector is the Cathode Ray Tube. Cathode Ray Tube or C.R.T projectors have three tubes made out of three different colors: blue, green, and red. When a ray touches the phosphor-coating of the tubing it generates a glow which is then reflected in the form of image presented at the projector screen. This type of projector is less used these days due to its bulky size.
Then there are L.C.D. projectors. LCD projectors beam light originating from a metal halide lamp into a prism. The light in turn divides it into three different color sections - red, blue, and green. The polarized lighting runs through the panels; and the single pixels either open up to let the light to move through them or close. The light-beams that are allowed to move through the pixels is what projects the picture on to the screen.
These days, one can also find Digital Light processing or DLP projectors in the market. These projectors project images by reflecting light using Digital Micro-mirror Device. Digital Micro mirror Device is a semiconductor chip which defines the resolution of the projected picture. The more the number of these mirrors, the higher is the resolution of the projected picture.
Before your purchase any particular type or model of the digital projector, you must decide the purpose of buying it or it use. Then you must consider the size of the room where the projector needs to be used, the distance between the audience and the projector screen, and also the screen size. If the room is big, buy a projector with large projection size. It must guarantee proper illumination or brightness inside the room so that the presentation is easily and clearly viewed by everyone present inside the room.
The density of pixels or image resolution needs to be taken into consideration too. For High definition TV viewing, a projector with pixel strength 1920 x 1080 is ideal.
Finally, ensure that the projector is portable. Portability ensures that the projector can be installed anywhere without facing any inconvenience of any type.
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