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The structure of TFT-LCD is that Liquid Crystal is being filled between C/F Glass & TFT Glass. One Pixel consists of 3
sub-Pixels(R,G,B) and according to the number of the pixels, Display Resolution (SVGA,XGA,etc) is determined.
The TFT Matrix consists of Data Line(Carrying display data signal),Gate Line(Carrying signal for turn On/Off the
TFT).Each TFT, on each sub-pixel, controls the amount of Applying Voltage between C/F glass electrode & TFT glass
electrode for the Liquid Crystal.
The Applying Voltage changes the Direction of Liquid Crystal which changes direction of the Light. Transmittance rate
of the Polarized Light, polarized by Polarizer, is controlled by Applying Voltage. As a conclusion, Displayed Light is now
under-control of Display Data Signal.
TFT- LCD Operating mechanism
Light(CCFL lamp)
Polarizer
< Light transmittance >
< Blocking >
< VLC = 0 > < VLC = 3.3V >
Electrode
Polarized light
Electrode
Liquid
Crystal
V
LC
= on
&
&&
&
Liquid
Crystal
&
&&
&
V
LC
= off
Polarizer is a filter
which polarize the
light to one direction.