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LCD
- Abbreviation
for Liquid Crystal Display. A display that consists of
two polarizing transparent panels and a liquid crystal
surface sandwiched in between. Voltage is applied to
certain areas, causing the crystal to turn dark. A
light source behind the panel transmits through
transparent crystals and is mostly blocked by dark
crystals.
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LCD
Television
- An LCD
Television is a flat panel television that utilizes the
same basic Liquid Crystal Display technology that has
been in used for some time in cell phones, camcorder
viewfinders, and computer monitors. LCD panels are made
of two layers of a glass-like material, which are
polarized, and are "glued" together. One of the layers
is coated with a special polymer that holds the
individual liquid crystals. Electric current is then
passed through individual crystals, which allow the
crystals to pass or block light to create images. LCD
televisions can be made very thin, thus allowing them to
hung on a wall or placed on small stand on top of a
table, desk, dresser, or cabinet very easily. In
addition, with some modification, LCD technology is also
used in some rear-projection televisions.
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LCOS
-
Abbreviation for Liquid Crystal on Silicon.
LCOS is actually a
variation of LCD technology and is used in video
projectors and rear-projection televisions. It is a
fixed pixel display device that projects images from
light reflected from a chip covered in liquid crystal
that modulates light to produce color.
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Learning
Remote -
A type of
Universal Remote Control device that is able to receive
infrared signals from other remotes to imitate the IR
pattern. Assigning the commands from other remotes to
buttons on the Learning Remote gives it invaluable
flexibility as a universal remote.
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LED
- Abbreviation for
Light Emitting Diode. Used on display panels on the
front of electronic components. Valued for low power
requirements and longevity.
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Letterbox - Term
used to describe viewing a widescreen image on a
NON-widescreen TV monitor. The result is a full width
image with black bars at the top and bottom of the TV
monitor screen. Similar to "Widescreen."
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LFE
-
Abbreviation for Low Frequency Effects. A home theater
audio term that refers to low frequency sound effects in
a multi-channel surround format, such as Dolby Digital
or DTS. The .1 actually denotes the very low effects
extracted from any of the surround channels (front left,
front right, center, rear left, rear right, etc). If a
subwoofer is present in the home theater system, all of
the extracted audio information is routed to the
subwoofer.
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Line Doubler
-
Specially designed device to double the number of Scan
Lines in an (usually) NTSC monitor or projector.
Enhances picture quality by reducing jitter and video
artifacts.
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Line Level
- Also
know as “low-level”, an audio term referring to the
signal before power amplification. In a system with
separate pre- amp and power-amp the pre-amp output is
line level CD players, VCRs, DVD players, Laserdisc
Players etc., are connected in a system at line level,
usually with shielded RCA type interconnects. (For
techies, it's a signal level between -10dBu and +30dBu.)
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Lines of Horizontal Resolution
- Lines
of horizontal resolution refers to visually resolvable
vertical lines per picture height. It is measured by
counting the number of vertical black and white lines
that can be distinguished an area that is as wide as the
picture is high. DVD has 720 horizontal pixels (on both
NTSC and PAL discs), the horizontal resolution can be
calculated by dividing 720 by 1.33 (for a 4:3 aspect
ratio) to get 540 lines. VHS has about 230 lines,
broadcast TV has about 330, and laserdisc has about
425).
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Loudness Control
- On a
preamp or receiver, a function that boosts lower and, to
a lesser degree, higher frequencies of the audio
spectrum to compensate for the way your ear works at low
volumes.
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Loudspeaker -
A Loudspeaker is a device that converts
electrical signals into sound as the result of an
electro-mechanical process. A microphone is the
opposite of a loudspeaker, in that it converts sound
into electrical signals.
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Low Pass Filter
- A
filter designed to pass low frequencies while
attenuating high frequencies.
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Luminance -
Abbreviated Y. That part of the video signal that
carries the information on how bright the TV signal is
to be: The black and white signal. |
