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The
predominant
projectors available
for video
presentations in
home theatres or
office settings are
CRT (cathode ray
tube), LCD (liquid
crystal display) as
well as DLP (digital
light processing),
while another,
liquid crystal on
silicon or LCOS, has
also been
developed. The
digital technology
of LCD, DLP, and
LCOS allows for
compact, lightweight
construction, high
quality image
presentation, and a
unit that is easily
portable, with
easy
mounting options to
meet various
requirements. There
are advantages and
disadvantages to
each technology. LCD
projectors are also
often used for other
types of
presentations, such
as PowerPoint
displays.
Unlike rear
projection
televisions, in
which everything is
encased in the set
itself and reflected onto the screen, a
front projector is
set up at a distance
from and in front of
the screen or wall and a
control panel is set
conveniently in the
center; a mobile
device such as a
laptop might be used
as the controller.
Selecting a
projector TV
system can allow you
to enjoy a larger
picture for your
money. Front
projectors can be
attached to
ceiling
mounts or
wall mount
devices built for
that purpose, or
some may be utilized
on
mobile projector
carts for
business setting
usage. |
View details
on this popular
Universal Projector Mount
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LCDs
are also known as "transmittive projectors" because they transmit light onto
an element that forms the picture. In the case of LCDs, a bright light
illuminates the liquid crystal panel within which the colored cells of
minute pixels are being excited by an electrical charge into image
formations. Older transmittive technology CRT projectors use cathode ray
technology resulting in a heavy and large unit due to the size and weight of
the components. The image formed by the LCD is then projected onto the
screen. (For additional details on the inner workings of LCDs, see
information contained in About LCD
and Plasma Screens.)
Digital
light
processing
technology
utilizes a
minute chip
whose
surface is
designed
with
thousands of
miniscule
mirrors. The
movie
projectors
lamp is
focused on
the many
mirrors of
the chip's
surface and
each mirror
adjusts its
placement to
change the
light
intensity
and
direction
into the
lens or
turns away
to shut off
that part of
the picture,
and images
are formed.
In a 1-chip
system,
white light
passes
through a
color wheel
filter,
causing
colors (red,
blue and
green light)
to be shown
on the
surface of
the chip. A
human's visual
system
integrates
the color
and sees a
full-color
image. There
is also a
3-chip
system, in
which the
white light
passes
through a
prism,
dividing it
into
red, blue
and green.
Each chip is
dedicated to
a color and
reflects off
the mirrors
to pass
through the
projector
lens to form
an image.
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Projectors offer
you the freedom of selecting where and how to place them in your room.
Both wall and ceiling mounts are available, and are designed to fit
universally, meaning many types can be mounted where needed. LCD projectors for
PowerPoint presentations, which are so useful in office situations, can
also be set onto mobile projector carts or multi-media podiums that
offer shelves for your projector, laptop, and notes.
You'll find
solutions for your projection
mounting needs at ErgoInDemand.com, whether for home
theatre use or office presentations.
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