select a letter for terms starting with that letter:
| B | C
| D | E
| F | G
| H | I
| J | K
| L | M
| N | O
| P | Q
| R | S
| T | U
| V | W
| X | Y
The bright source of any projector partially responsible
for your sharp, clear image.
Acronym for Local Area Network; the local area typically
being an office building or technology campus. Great
for controlling your projector remotely speical network
Acronym for Liquid Crystal Display; liquid crystals
exist in an intermediate state between liquid and solid,
and realign under electrical stimulation. Exceptionally
slim and lightweight, they are ideal in word processor,
computer, and TV displays.
A measurement of the amount of visible light energy
that comes from a light source and is perceived by the
Lamps have different color characteristics in terms
of just what color of white light they emit.
Incandescent lights all tend to emit a continuous spectrum
of light (light which contains all colors), with a tint
towards just one color. Tungsten-halogen, or quartz
lamps, are generally considered to emit white light
in the 3200K to 3400K range. The everyday incandescent
light bulb is reddish in color, and has a color temperature
in the 2800K range. There are a number of other types
of lamps available. They are not used in designs, because
many are deficient in certain areas of the color spectrum,
and are inappropriate for use in a display environment.
- Low Pressure - The
low-pressure sodium lamp has the highest lamp efficacy
of all sources, but it is monochromatic yellow. The
light-producing element is an arc tube. The arc tube
contains a small amount of argon and neon to aid in
starting the lamp. The bulb is made of ordinary glass.
It acts to maintain a constant environment for the
- High Pressure - High-pressure
sodium lights also use an arc tube. The arc tube is
small in diameter to maintain a high operating temperature.
The arc tube is made of a ceramic material.
- Vapor - Mercury vapor
lamps use a light-producing element that is in an
arc tube. The arc tube is constructed of quartz to
allow ultraviolet radiation to be transmitted. The
arc tube contains mercury and small quantities of
argon, neon, and krypton.
- Halide Lamps
Metal halide lamps use a light-producing element that
is an arc tube. The arc tube has the same construction
and operating principles as the mercury lamp. The
color of the metal halide is balanced across the spectrum.
By improving the color without the need for a phosphor
coating, the lamp approaches a point source that will
result in better potential for optical control.
Acronym for Local Area Network. A system that connects
two or more microcomputers to allow users to share resources
to IDTV line doubler with motion mode interpolation.
Portable computer-larger than a palm top but smaller
than a desk top.
Light Amplification by Stimulated Emission of Radiation,
often used for laser pointers.
(Liquid Crystal Display)
A device that displays text and graphics on a flat screen
that uses no projected light or illumination.
A device used to project video images through a Liquid
Crystal Display and an overhead projector onto a large
Light Emitting Diode, a semiconductor diode that converts
electrical energy into visible light. Often used in
VCR and other equipment displays.
A cylindrical lens which causes light passing through
it to be dispersed perpendicular to its axis.
A large series of parallel lenticulations cut vertically
into the screen surface to improve horizontal dispersion.
Manufacturers of screens include:
Sterwart Filmscreen and Da-Lite.
The Level Control on selected Extron
interface products is similar to the Contrast Control
on a data monitor. It can either increase or decrease
the output voltage level of the interface to the connected
data monitor or projector. This results in greater or
less contrast in the picture.
A device the light transmission of which can be varied
in accordance with an externally applied electrical
voltage, current, an electronic magnetic field, or an
The ability of a display device to produce the an object
the same size anywhere on the screen, e.g., Poor linearity
may show a line of text at one size when it is at the
top of the screen, but at a different size when the
same line of text is at the bottom of the screen.
An Increased Definition Television unit that doubles
the number of scan lines in a video picture. This fills
the space between the original lines, making them less
A sequence of operations performed by hardware and software.
Hardware logic refers to the memory chips and electrical
circuits that perform the controlling operations of
a computer. Software logic, also called program logic,
is the sequence of instructions in a particular program.
The condition where the source or load is at a lower
impedance than the characteristic impedance of the cable.
Low source impedance's are common; low load impedance's
are usually fault conditions.
In most projector, the video input section includes
a signal path that bypasses most of the internal circuitry
and "loops through" the signal, buffered and
sent back out to make it available to be displayed by
another display device (e.g., CRT
A programming language, also referred to as an assembly
language, where each statement translates into a single
A measurement of quantity of light taken at the source
of the light. Lumens per square foot are foot candles.
The signal that represents brightness in a video picture.
Luminance is any value between black and white. Luminance
is abbreviated as "Y".
The amount of light per square meter, incident on a
surface. The metric measurement of light quantity. The
measurement is taken from the reflection off the object
illuminated. One foot-candle equals 10.76 lux. A lux
equals one lumer per square meter. 1 lux = 1 lumen/square
meter = 0.093 foot-candles.