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LCD and LED
What’s the difference
between LCD and LED?
BY
HOWSTUFFWORKS.COM CONTRIBUTORS
LCD stands
for “liquid crystal display” and technically, both LED and LCD TV’s are
liquid crystal displays.
The
basic technology is the same in that both television types have two layers of
polarized glass through which the liquid crystals both block and pass light.
So
really, LED TV's are a subset of LCD TV's.
LED,
which stands for “light emitting diodes,” differs from general LCD TV's in that
LCD's use fluorescent lights while LED's use those light emitting diodes.
Also,
the placement of the lights on an LED TV can differ.
The
fluorescent lights in an LCD TV are always behind the screen.
On
an LED TV, the light emitting diodes can be placed either behind the screen or
around its edges.
The
difference in lights and in lighting placement has generally meant that LED TV's
can be thinner than LCD's, although this is starting to change.
It
has also meant that LED TV's run with greater energy efficiency and can provide
a clearer, better picture than the general LCD TV's.
LED
TV's provide a better picture for two basic reasons.
First,
LED TV's work with a color wheel or distinct RGB-colored lights (red, green,
blue) to produce more realistic and sharper colors.
Second,
light emitting diodes can be dimmed.
The
dimming capability on the back lighting in an LED TV allows the picture to
display with a truer black by darkening the lights and blocking more light from
passing through the panel.
This
capability is not present on edge-lit LED TVs; however, edge-lit LED TV's can
display a truer white than the fluorescent LED TV's.
Because
all these LCD TV's are thin-screen, each has particular angle-viewing and
anti-glare issues.
The
backlit TV's provide better, cleaner angle viewing than the edge-lit LED TV.
However,
the backlit LED TV will usually have better angle viewing than the standard LCD
TV.
Both
LED and LCD TVs have good reputations for their playback and gaming quality.
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