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Terminology
Some commonly used technical terms are explained below :
CRT PROJECTOR:
Large three-lens (Red, Green & Blue) projectors designed for permanent
installation where high quality video and data images are essential. Switchable
between different levels of resolution without degradation of image quality.
DLP/DMD:
The very latest projection technology - Digital Light Processing - achieved
using Texas Instruments' proprietary Digital Micromirror Device - essentially
an array of small mirrors controlled by an integrated circuit. DLP is a reflective
rather than a transmissive technology, delivering higher light output from
a given source. It has great potential for higher resolution.
LCD:
Liquid Crystal Display.
LCD PANEL:
The budget solution to data projection. Computer data is transmitted to an
LCD panel incorporating TFT technology which is projected to a screen using
an overhead projector as a light source.
LCD PROJECTOR:
LCD panel and light source combined into a single, portable unit. Considerably
more powerful than a panel. Many LCD projectors incorporate features like
zoom lenses or cordless mice to simplify operation.
LCD MONITOR:
A lightweight, portable and compact alternative to the CRT monitor. Available
with touch screen option.
METAL HALIDE:
Superior lamp technology offering high brightness and longevity at extra cost.
See also Quartz Halogen.
NTSC:
The 525-line American colour TV format as specified by the National Television
Systems Committee.
PAL:
The Phase Alternate by Line colour TV format used in the UK and in most of
Europe, where each frame has 625 lines comprised of two interlaced fields.
PLASMA DISPLAY PANELS:
PDPs use helium, neon and xenon gases, which are placed between two glass substrates.
The gases are then activated with accelerated electrons, causing them to
produce ultraviolet rays which simulate red, green and blue fluorescent materials
at each pixel. PDP technology requires higher power and can be used in applications
that do not have such stringent weight requirements while offering the obvious
advantages of being thin and flat. Additionally, PDPs provide a better viewing
angle.
POLYSILICON:
Newer LCD panel material that offers better performance and colour contrast
than TFT. Usually requires three panels per projection device (Red, Green & Blue)
and consequently tends to be more expensive. See also Amorphous TFT
QUARTZ-HALOGEN:
Basic projector lamp technology. Cheap to replace, but with a relatively short
lifespan. See also Metal Halide.
SECAM:
The 625 line (SEquential Couleur Avec Memoire) colour TV format used in France.
