Projection TV Photography Shack Guide
Projection TV Is The Cheaper Option
By Nikos L Maxwell
Rear-projection TV is slowly but surely gaining popularity
among contenders like plasma screens and LCD screens.
LCD projectors and the DLP projector may not be household
words just yet, but many Americans are opting to save
a couple thousand dollars, without sacrificing quality.
When we think of home theater projectors, we usually
conjure up an image of the movie theater projector casting
its beam onto a large screen ahead of it. A RPTV works
similarly by projecting an image, only it projects an
image onto a TV screen from behind, rather than in front
of it. There are generally three types of technologies
used in these television sets today, which are the Cathode
Ray Tube, the Liquid Crystal Display and the Digital
Light Processing systems.
The Cathode Ray Tube System
One type of rear-projection TV technology is the Cathode
Ray Tube system. Within your TV, there are tubes of
red, green and blue phosphors; within the cathode ray
tube, a large vacuum tube, an electron beam will scan
the face of the tube, light up the phosphors and create
an image, which is then reflected onto the screen.
The benefit of CRT projection televisions is that they
produce the blackest blacks, in addition to film-quality
color and brightness. Since this is one of the oldest
TV technologies, you can imagine the price is most reasonable.
However, the problem comes with the size, as the bulky
cabinet stands in stark contrast to LCD projectors or
plasma projectors. Additionally, a lot of heat is generated,
so liquid gels must be used to cool the system down
and older TVs often shut down due to leaky gel casings
over time.
The Liquid Crystal Display (LCD) System
Another type of rear-projection TV technology is the
Liquid Crystal Display (LCD) system, which uses a different
technology than the LCD flat panels you're probably
more familiar with.
The benefit of using LCD projectors is that they boast
wonderful color depth and excellent brightness. Additionally,
the video projector technology is more energy efficient
and resistant to the sort of screen burn-in that other
TVs suffer from sustained images, like static video
games screens. The drawback of LCD projectors compared
to LCD flat panel TV sets is its slower response time
for fast moving objects, which sometimes creates a ghosting
effect, and its limited display of dark or shadowed
scenes.
If you sit too closely, you may be able to see the
individual pixels. Compared to a CRT system, the LCD
projector is much smaller and offers more floor space,
although it is a couple of hundred dollars more expensive.
Also, CRTs are more flexible at displaying different
resolutions, whether your movie is 1920 x 1080 or 1024
x 768 pixels.
Digital Light Processing Projection TV
Digital Light Processing projection televisions are
the third type of system commonly used in the world
of rear-projection TV making. Because of the large size
options, the superb quality of color accuracy/contrast/brightness/resolution
and the affordability, the DLP projector is usually
billed as "the best option for consumers who want
the largest screen for the least amount of money."
The quality of the picture can be so film-like that
many movie theaters have started using this technology
for their digitally converted films. Even so, there
are a few limitations. For instance, there are not limitless
pixels, so the picture quality can only be so detailed.
Also, some people can see a rainbow flash of color
when they look from one side of the screen to the other.
Over the years, projector technology has changed but
the output is very similar. The best way to find a suitable
TV is to check them out side by side.
About the Author:
Nikos L Maxwell has written a number of articles on
digital photography and digital editing software including
Digital
Editing Software, Adobe
Photoshop Tutorial, Large
Images, Edit
Pictures, Fuji
Film Digital Cameras, Video
Editing Computers, Digital
Image Processing, Ray
Disc, Blu
Ray, Blu
Ray Disc, Blu
Ray HD DVD, Blu
Ray Reviews, Blu
Ray Vs HD DVD, DVD
Duplication, Ray
HD.
Keep a lookout as more articles are added from this
popular author on this website in the near future.
More Projector Facts....
What is an overhead projector?
An overhead projector is a rather
bulky machine that has a light source in a box with
a clear glass covering. A transparency is laid on the
lit glass and the image is projected onto a screen.
Many teachers in schools use these types of projectors
to help in their instruction.
The transparencies allow for
the teacher to mark on them to help instruct the students
or to clarify issues. There are considerable downsides
to using these types of projectors though. The first
is that they are very bulky. The second is that even
though the image of the transparency can be enlarged,
it distorts the image and the third is that the teacher
has to purchase the transparencies if they do not come
with the material sent out by the education provider.
RECOMMENDED READING
|
|
|
|
| Copyright
© 2007 - 2010 The Photography Shack, All
Rights Reserved |
|
