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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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See
fluidentity.
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A
semiconductor device that converts electrical energy into electromagnetic radiation. The LED emits
light of a particular frequency (hence a particular color) depending on the
physical characteristics of the semiconductor used. See electroluminescence.
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A
semiconductor device that emits visible light
when an electric current passes through it. The light is not particularly
bright, but in most leds it is monochromatic,
occurring at a single wavelength.
The output from an LED can range from red (at a wavelength
of ~700nm) to blue-violet (~400nm).
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Technology used for displays in notebook and
other smaller computers. Lcds allow displays to be
much thinner than cathode ray tube technology. Lcds consume
much less power
because they work on
the principle of blocking light rather than emitting it.
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A
sandwich structure of two semi-conductors
(p-n-junction). Light of a specific wavelength
or colour is emitted from this junction when a
current runs through it. The colour can be adjusted
by choosing different semi-conductors
and process engineering.
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The
orientational properties of liquid crystals (LC) can be used to create a display. The
relative orientation of the molecules
in one pixel of the LC-layer can be adjusted by applying a voltage. When this
layer is placed between two polarisers the intensity of light passing
through it can be adjusted by rotating the molecules
in the LC-layer. Thus the brightness of each pixel of the display can be
selectively controlled.
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Work on a completely different concept. Traditionally leds are created from two semiconductors. By running current in one
direction across the semiconductor the LED emits light of a
particular frequency (hence a particular color) depending on the physical characteristics
of the semiconductor used. The semiconductor is covered with a piece of
plastic that focuses the light and increases the brightness. These semiconductors are very durable, there is no
filament, they don?¬t require much power, they?¬re brighter and
they last a long time. By densely packing red, blue and green leds next to each other on a substrate
one can create a display. The disadvantage of leds is
that they are much larger ?± therefore the resolution is not nearly as good as LCD displays.
That?¬s why most LED displays are large, outdoor
displays, not smaller devices, like monitors. OLED or Organic LED is not made of semiconductors. It?¬s
made from carbon-based
molecules. That is the key science factor that leads to potentially eliminating
leds?¬ biggest drawback ?± size. The carbon-based molecules
are much smaller. And according to a paper written by Dr. Uwe
Hoffmann, Dr. Jutta Trube
and Andreas Klâ€"ppel, entitled OLED - A
bright new idea for flat panel displays ?¬OLED is brighter, thinner, lighter,
and faster than the normal
liquid crystal
(LCD) display in use today. They also need less power
to run, offer higher contrast, look just as bright from all viewing angles
and are - potentially - a lot cheaper to produce than LCD screens.?® LCD, LED,
and OLED definitions courtesy The San Francisco Consulting Group (SFCG)
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Is
the predominant technology
used in flat panel displays. The principle that makes the display work is this: A crystal?¬s alignment
can be altered with an electric current. If the crystal
is lined up one way ?± it will allow the light waves to pass through a
polarized filter, but if the electric current alters the crystal?¬s
alignment, it will guide light so that the polarized filter blocks the light.
By densely packing red, blue and green light emitting crystals next to each other on a sheet (?¬called a substrate?®), one can create a full color display.
The great thing about LCD is that the crystals
can be packed together closely, allowing for a higher-resolution, finer-detail display. The con is that
lcds are somewhat fragile, require a lot of power and are relatively less bright.
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Is
the predominant technology
used in flat panel displays. The principle that makes the display work is this: a crystal
alignment can be altered with an electric current. If the crystal is lined up one way - it will allow the
light waves to pass through a polarized filter, but if the electric current
alters the crystal
alignment, it will guide light so that the polarized filter blocks the light.
By densely packing red, blue and green light emitting crystals next to each other on a sheet, one can
create a full color display. The great thing about lcd
is that the crystals
can be packed together closely, allowing for a higher-resolution, finer-detail display. The con is that
lcds are somewhat fragile, require a lot of power and are relatively less bright
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Technology used for displays in notebook and
other smaller computers. Lcds allow displays to be
much thinner than cathode ray tube technology. Lcds consume
much less power
because they work on
the principle of blocking light rather than emitting it.
Source
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A
semiconductor device that emits visible light
when an electric current passes through it. The light is not particularly
bright, but in most leds it is monochromatic,
occurring at a single wavelength.
The output from an LED can range from red (at a wavelength
of ~700nm) to blue-violet (~400nm).
Source
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Is
the predominant technology
used in flat panel displays. The principle that makes the display work is this: A crystalís
alignment can be altered with an electric current. If the crystal is lined up one way ń it will allow the light waves to pass through a polarized
filter, but if the electric current alters the crystalís alignment, it will guide light so that the polarized filter
blocks the light. By densely packing red, blue and green light emitting crystals next to each other on a sheet (ěcalled a substrateî),
one can create a full color display. The great thing about LCD is that the crystals can be packed together closely, allowing
for a higher-resolution, finer-detail display. The con is that
lcds are somewhat fragile, require a lot of power and are relatively less bright.
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