CRT (Cathode Ray Tube) Projectors.
Published by Ian on March 3rd, 2008 in Projectors
A CRT projector uses a small, high brightness CRT (picture tube) as the image generating element. The image is then focused and enlarged onto a screen using a lens in front of them. The earlier CRT projectors used to be monochrome, nowadays in a modern CRT projector you can find 3 different colour tubes blue, red and green along with their own lens to display the image or data on a screen.
The red, blue and green portions of the incoming video signal are processed and sent to the respective CRTs whose images are focused by their lenses to achieve the overall picture on the screen. These types of projectors are ideal for use in homes; businesses; educational centres etc. with proper tube size, video processing and lens combination, and an lcd projector can produce excellent displays.
The most common resolutions for a CRT projector are 800 × 600 and 1024×768 pixels. The various advantages and disadvantages of this type of projectors are:
Advantages: Can achieve very good resolution, brightness and picture size. Has a long tube life or projection life (22,000 hours).
Disadvantages: It’s large in size, bulky, non portable, more expensive than other projectors and has low maximum brightness level.
