2. CRT
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A CRT projector is a video projector that uses a small, high-brightness cathode ray tube as the image
generating element. The image is then focused and enlarged onto a screen using a lens kept in front of the
CRT face. The first color CRT projectors came out in the early 1950s. Most modern CRT projectors are
color and have three separate CRTs (instead of a single, color CRT), and their own lenses to achieve color
images.
The Cathode ray tube is a vacuum tube containing one or more electron and a fluorescent screen used to
view images.
3. LCD
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A LCD projector is a lamp transmits light through a small LCD chip made up of individual pixels
to create an image. The LCD projector uses mirrors to take the light and create three separate
red, green, and blue beams, which are then passed through three separate LCD panels.
4. DLP
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Digital Light Processing is a type of projector technology that uses a digital micromirror device. It was
originally developed in 1987 by Dr. Larry Hornbeck of Texas Instruments. DLP is used in a variety of display
applications from traditional static displays to interactive displays and also non-traditional embedded
applications including medical, security, and industrial uses.
