Digital Projector.
Digital projectors are the tools of
modern technology. This is used to convert the image data directly
from the computer onto a screen through a lens system. Digital
projector provides a visualization of the actual data stored in the
computer for presentation. This projector me allow the audience to
watch moving images from a DVD, digital versatile disk player. The
advertiser or seller also use a projector to give a demonstration of
the product to a large number of customers. It can easily convert a
written document into an interactive whiteboard. Digital projector
plays an important role in the formation of
home theater systems.
This uses the standard SVGA projector resolution i.e. e. 800,600
pixels in expensive devices.
Digital projector costs determined by
the resolution and also the brightness. If you will use it in a big
room or a large conference hall should be the brightness of 1.000 to
4.000 ANSI lumens. The first digital projector, projector Eidophor
was introduced in 1950. Eidopher projectors use an oily surface in
rotating disks with the light shining through it and employs an
electron beam to interfere with oil in a certain way. Eidophor
projectors are not able to produce the color. Currently there are
several high quality digital projector models available in the market
so that the projector Eidopher is less common.
Four Technology used in digital
projectors:
High intensity CRT
LCD Projector LCD light gates
Texas Instruments ' DLP technology
LCOS Projector.
Work based on the principles of refraction of light produced by the
LCD panels. This Panel is made separately based on the basic colors,
red, green and blue (R-G-B). So there are three LCD panels in a
projector. Color image released by the projector is the result of
refraction from the LCD panels that have been put together by a
special Prism. The picture that has been put together is then passed
through the lens and in the "fall" right on the screen so
that it can be viewed as the image intact.
The resulting image has a
color depth LCD projector which is good because the resulting color
LCD panel sports a refracted lens directly onto the screen. In
addition the image on the LCD projector was also sharper compared to
DLP projector image results. Another advantage of the LCD is a more
efficient use of light so that it can produce "ansi lumens"
is higher than the projector with DLP technology. While the weakness
of LCD technology is the big pixels which is clearly visible in the
picture. This is what causes the LCD technology is less suited to
play movies due to be tasted like see movies from behind the eyes
that hindered "membrane cataract"
CRT or often called Cathode Ray Tube also with the ancient Projector
utilizing the picture tube has been used on a conventional TV for
decades. With this projector, three types of CRT, magnifying lenses,
plus used to throw a picture onto the screen. The CRT is used to
project the primary colors, red, blue and green. The existence of
three tubes of different colors in a CRT projector, the projector
makes this quite big and heavy. So are considered less flexible for
use in presentations in small spaces.
This kind of projector work
well to produce a great contrast, very different in black leather,
and the color is great. CRT because the image is not scanned by an
electron beam, they are not limited to a specific range of pixels and
offer greater latitude in terms of screen resolution. Overall, a CRT
projector gives viewers a very satisfying, the picture quality of the
film. Unlike DLP and CRT projectors, LCP model does not have a light
bulb that needs replacement, the consumer will save you money. Also,
CRT models last for 20, 000 hours life is relatively long.
There are some drawbacks to this kind of projector. CRT models are
usually quite expensive, ranging from about $ 10, 000. They are also
large, often require the same amount of room as 20-inch TV. Also, for
a CRT projector to work to its fullest capability, dark room
required.
3. DLP Projector
Digital Light Processing DLP with an
abbreviated first developed by Texas Instruments. On DLP projectors,
light beforehand will be of a Color Filter wheel-shaped. Then the
color will be obtained regarding the Digital Micromirror Devices
(DMD). Is this then the DMD of light will be projected, in a way
reflected onto the screen. DMD is an optical chip that consists of
three layers of micro mirrors, each layer separated by a cavity to
allow the mirror to tilt so far-10 to + 10 degrees. The slope of each
mirror DMD will be governed by a special chip on the DMD. The
existence of the DMD DLP need only make one set of optic cables only.
This simplicity makes the DLP projector more compact and lightweight.
Its weight can reach less than 250 grams. Contrast Ratio DLP pixel
structure and also better. This is caused by the transmisive system
which is owned by the DLP. Although on some DLP side better than LCD,
DLP also has drawbacks. Use of DLP colorwheel in detract value
brightness projector. In terms of price, DLP projectors are also more
expensive, because it requires a high production cost.
The DLP has a very different way of
working with the LCD. One of the differences is the existence of DLP
DLP chip (also known as DMD-Micro Digital Device). On DLP chips there
are mirror-mirror micro-sized (millionth) made of aluminum and serves
to reflect light to form the image. These mirrors deflect the light
can move up to 5000 times per second. There are also other
differences on how the DLP gave a passing light color on the
projector lamp. Micro mirrors on DLP chips do not have a specific
color to give color to the gamma. So it takes color filter (in the
form of a circle that contains the basic colours red, green and blue)
are churning with a particular rhythm and synchronized with the
movement of micro-mirror.
The light that is not used on the final
image will be deflected out of the path of bias by the micro mirrors.
Hi-end projectors there are dunked 3 chip DLP in the device. Each
chip handle color basis. So usually have an expensive price. DLP technology advantages present in light
space is simply necessary. This certainly affects the size of the
"body" of the projector. In addition, the resulting color
contrast DLP projector with very good quality black color better. The
visible pixels in the image produced by the LCD projector can also be
minimised by DLP technology. While the weakness of the DLP are
present in the color circle is one of the components of importance.
In some cases, this can produce a color circle "rainbow effect".
Namely the emergence of foreign colours outside the 3 primary colors
that exist due to the rotation of the circle color errors
4. LCOS Projector.
This last technology utilizes two
technologies advantages already present before, namely LCD and DLP.
LCOS technology more easily produced and lighter than LCD. The
resulting resolution is also better than LCD. Even this technology
into account resolution can be achieved, i.e. QXGA 2048 × 1536
pixels. Very high, even the highest. This technology also reduces
artifacts that appear on the LCD.
In addition, LCOS has analog controls
like a LCD with better color gradations than DLP. Contrast ratio
technology is also better than LCD although