A digital projector takes a video signal and projects the corresponding image on
a projection screen using a lens system. All digital projectors use a very bright
light to project the image, and most modern ones can correct any curves, blurriness,
and other inconsistencies through manual settings. Digital projectors are widely
used for conference room presentations, classroom training, and home theatre applications.
Please follow the next tabs for specific information.
A standard TV has an aspect ratio of 4:3. The HDTV standard is 16:9, which is 16
units of width for every 9 units of height.
A projector's native resolution is the number of pixels that it has available to
create an image. The higher the resolution of a projector, the more pixels it has.
Projector resolution is designated with two numbers, such as "1280x720." The first
number indicates how many horizontal pixels , and the second number indicates the
number of vertical pixels. You should consider two resolutions for home theater,
1280x720 and 1920x1080.
The larger the screen, the longer the distance from projector to screen and the
less you can control room light, the brighter a projector you will need.
For Home Theater applications, however, brighter is not necessarily better - contrast
ratio is perhaps more important.
There are two methods of measuring light in a home theater. One is the ANSI lumen
rating of the projector. That measures the light energy capable of being generated
by the projector itself. The second is foot-Lamberts (fL), which takes the screen
into account and measures the total light that is being reflected back toward the
audience. Of the two, foot-Lamberts is the better method.
Contrast is the difference in brightness between maximum white and deepest black
in an image. The greater the difference, the higher the contrast. With business
projectors, lumen output is of critical importance, and contrast is second. Home
theater projectors are the exact opposite. Contrast is probably the most important
measurable quality in a home theater projector.
To increase flexibility of installation many projectors have zoom lenses and lens
shift capabilities that allow you to place the projector further back or not exactly
in front of the screen, yet still get a great picture.
Three main technologies are available for digital projectors: DLP, LCD and LCoS.
In DLP projectors, the image is created by microscopically small mirrors laid out
in a matrix on a semiconductor chip.
LCD projectors (liquid crystal display) typically send light from a Metal halide
lamp through three LCD panels -- one each for the red, green, and blue components
of the video signal. LCoS (liquid crystal on silicon) it is a reflective technology
similar to DLP projectors.
However, LCoS projectors use liquid crystals instead of individual mirrors.
This depends on your budget. Bright and Sleek offers projectors in the hundreds
of dollar range and also projectors over $100,000.
A digital projector takes a video signal and projects the corresponding image on
a projection screen using a lens system. All digital projectors use a very bright
light to project the image, and most modern ones can correct any curves, blurriness,
and other inconsistencies through manual settings. Digital projectors are widely
used for conference room presentations, classroom training, and home theatre applications.
