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| What is an LCD? |
LCD
Technology
LCD TV (or Liquid Crystal Display) works by trapping
a liquid crystal solution between two sheets of polarized
glass. When an electric current is passed through the
liquid crystals, they align so that light cannot pass
through. Within LCD televisions each crystal then either
blocks or allows light to pass based on the broadcast
information. For clear, crisp color that rivals traditional
CRT displays, a thin film transistor, known as a TFT
is employed. LCD technology allows screens to be thinner,
and televisions to be lighter and more energetic than
before, resulting in a flat panel TV that can fit in
place where conventional televisions cannot.
TFT-LCD TV plays a critical role in transmitting and
controlling electric signals, which determines the amount
of voltage applied to the liquid crystal. The liquid
crystal controls light permeability using different
molecular structures that vary in accordance with the
voltage. In this way, the desired color and image is
displayed as it passes through the color filter. The
TFT-LCD consumes less energy compared to a cathode-ray
tube (CRT), is slimmer and weighs less. Moreover, the
TFT-LCD is the high-tech digital display device for
the next generation, and it does not emit harmful electromagnetic
waves.
TFT
LCD (Thin Film Transistor Liquid Crystal Display)
has a sandwich-like structure with liquid crystal
filled between two glass plates.
TFT Glass has as many
TFTs as the number of pixels displayed, while
a Color Filter Glass has color filter which generates
color. Liquid crystals move according to the difference
in voltage between the Color Filter Glass and
the TFT Glass. The amount of light supplied by
Back Light is determined by the amount of movement
of the liquid crystals in such a way as to generate
color. |
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