A projector is an apparatus for presenting an enlarged image on a screen
from a transparency such as a photographic slide or a film. But how does a
projector work? To display images, LCD (liquid crystal display) projectors
typically send light from a metal halide lamp through a prism that
separates light to three poly silicone panels — one each for the red,
green, and blue components of the video signal. As polarized light passes
through the panels (combination of polarizer, LCD panel and analyzer),
individual pixels can be opened to allow light to pass or closed to block
the light. The combination of open and closed pixels can produce a wide
range of colours and shades in the projected image. Metal Halide lamps are
used because they output an ideal colour temperature and a broad spectrum
of colour. These lamps also have the ability to produce an extremely large
amount of light within a small area: current projectors average about
2,000-4,000 ANSI lumens.
Newer technologies, such as DLP and LCOS are becoming more popular in video
projection. In practice, the term “LCD Projector” is often used as a
catch-all for any type of computer projector, regardless of the technology
being used. But there are serious differences between DLP projectors and
LCD projectors. The proponents of LCD projector technology point out that
DLP suffers from issues like rainbow effect and unnatural brightness. Owing
to their robust technology, LCD projectors today have come to occupy nearly
65% market share with DLP ones having the rest. This essentially implies
that LCD projectors score when it comes to price vs. performance ratio.
Also, in case of DLP projectors, the core technology are owned by Texas
Instruments, which itself is not into the projector business. On the
contrary, Epson and Sony both offer core LCD technology to other players
and are themselves the manufacturers of projectors as well. This allows
more room for LCD players to have modifications done in the core technology
to suit their requirements, an advantage not enjoyed by the DLP projector
manufacturers. So our advice would always be to go for a LCD projector
rather than a DLP projector.
But before to buy yourself a projector, make sure your product has the
1. Most of the ordinary and average LCD screens have a screen ratio of 4:3.
However, in some cases, an LCD might also have a screen ratio of 16:9.
2. The utilization of three high-definition two-inch poly silicon TFT LCD
panels are key elements in the production of the three RGB basic colours.
3. Images of high ratio contrast are produced. Usually the image contrast
4. A good LCD projector adds to the normal brightness by about 40% over
most other conventional and ordinary LCD video projectors. These LCD
projectors use a high-transparency LCD panel for the above purpose.
Paperbite.com specialise in supplying all the type of projectors
laminators for offices, showrooms, and home. Visit Paperbite.com
[http://www.paperbite.com] for more information.
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