Digital Projection in Your Home Theater (DOC) by MonikaKam

VIEWS: 3 PAGES: 6

									Title:
Digital Projection in Your Home Thea
ter

Word Count:
724

Summary:
If you are looking at digital RPTVs
 and your viewing room can accommod
ate a 90" or 100" screen, don't ove
rlook the possibility of a projecto
r and screen instead.
Keywords:
projector, projection, digital, tv,
 television, home theater, rear pro
jection

Article Body:
A projector is a device that integr
ates a light source, optics system,
 electronics and display(s) for the
 purpose of projecting an image fro
m a computer or video device onto a
 wall or screen for large image vie
wing. There are hundreds of product
s available in the market and they
are differentiated by their resolut
ion, performance and features. Thes
e devices can be attached to a comp
uter or video device just as you wo
uld connect a traditional monitor.

The term "big screen" is used to in
dicate a TV size larger than 40 inc
hes in diagonal measurement. Until
recently these are usually rear-pro
jection screens, although we are se
eing more and more flat-panel displ
ays at competitive prices.

<b>The appeal of Rear-Projection TV
(RPTV)</b>

There certainly is a great deal of
consumer appeal for RPTVs these day
s. And it's easy to understand. Par
t of it is due to the simplicity of
  the product. After all, what could
  be easier than getting a bigger TV
? If you want a larger image with n
o muss and fuss, it can be purchase
d from any local big-screen retaile
r and delivered within a day or two.

Another the appeal of RPTVs is the
impression created by big-screen re
tailers that RPTVs are cheaper than
 front projection systems.
Clearly there is a market for both
types of home theater solutions. Fr
om a practical perspective your roo
m size has a lot to do with determi
ning which approach is best for you
. If you don't have a large viewing
  room, a 40" to 60" diagonal TV wil
l probably be plenty. In this case,
  the rear-projection solution is mo
re practical assuming you can fit t
he box into the space.

But if you want the large screen ci
nema experience and your room size
will allow it, front projection is
the way to go. Front projectors are
 made to produce screen images in t
he range of 70" to 120" diagonal or
 more. Once people realize they can
 get a picture up to four times the
 size for the same money as a good
RPTV, it opens up a whole new world
 of entertainment possibilities.

<b>How good is the Rear-Projection T
V:</b>

As noted above, the advantages of R
PTVs are obvious. There is a wide a
rray of products in different sizes
 and price ranges. There are usuall
y several local showrooms in most a
reas. And they are simple to buy an
d install.
However, RPTVs have several limitat
ions that front-projection systems
do not. Among them are limited scre
en size, poor viewing angles, exces
sive reflections, poor aspect ratio
 management, and loss of floor spac
e.

Screeb size is an obvious differenc
e, but still worth thinking about f
or a moment. A 100" diagonal front
projection screen is four times the
 surface area of a 50" RPTV. If you
 want to put real "theater" in your
 home theater, the projector and mo
vie screen approach delivers it. RP
TVs are just big televisions.
Digital Projectors

A digital projector is an electro-o
ptical machine which converts image
 data from a computer or video sour
ce to an image which is then displa
yed on a distant wall or screen usi
ng a lens system. A typical resolut
ion for a portable projector will b
e the SVGA standard (800×600 pixels
), with more expensive devices supp
orting XGA (1024×768 pixels). The c
ost of a device is not only determi
ned by its resolution, but also by
its brightness. For use in large co
nference rooms the brightness shoul
d be between 1,000 and 4,000 ANSI l
umens.

There are four competing digital pr
ojection technologies: high intensi
ty CRT, LCD projectors using LCD li
ght gates, Texas Instruments' DLP t
echnology and LCOS or liquid crysta
l on silicon. In 2004 and 2005, LCD
  front projection has been enjoying
  a come-back because of the additio
n of the dynamic iris which has imp
roved contrast up to the levels of
DLP.

There is a genuine market for both
RPTVs and projectors for home theat
er. RPTVs are simple, but they have
 limitations in screen size and per
formance. Projectors and screens re
quire some installation work, but o
nce it is done you end up with a mo
re dramatic theater experience.

The bottom line is this: if you are
 looking at digital RPTVs and your
viewing room can accommodate a 90"
or 100" screen, don't overlook the
possibility of a projector and scre
en instead. If you can afford a dig
ital RPTV, you can afford a project
or. And dollar for dollar the proje
ctor will often deliver the maximum
 "wow" factor for the money invested.

								
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