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In most cases described so Lcd each pixel of an LCD consists of a common layer molecules aligned between two transparent electrodes and two polarizing filters, the transmission shaft each being perpendicular.

But they have the liquid crystal polarizing filter, and for this reason the light passing through the first filter which would be blocked by the second (crossed) polarizer.

But the electrode surface in contact with the liquid crystal material is treated to adjust the liquid crystal molecules in a particular direction.

But this procedure is generally applicable standard consists of a thin polymer layer that is unidirectionally rubbed using, for example, cloth.

As the direction of liquid crystal alignment is defined by the direction of rubbing.
But much before the application of an electric field, the orientation of liquid crystal molecules is determined by adaptation to surfaces.

But in a twisted nematic device, TN (one of the most common devices between the liquid crystal display), the directions of surface alignment of the two electrodes are perpendicular to each other, and thus organized molecules in a helical structure, or kink.

Since

because the liquid crystal material is birefringent, light passing through a polarizing filter is rotated by the liquid crystal helix passing through the liquid crystal layer, by allowing it to pass through the second polarizing filter.

But we know that half of the incident light is absorbed by the first polarizing filter, but otherwise the entire assembly is transparent.

I

when you apply a voltage across the electrodes, a turning force orients the liquid crystal molecules parallel to the electric field that distorts the helical structure (this is resisted by elastic forces since the molecules are confined to surfaces.)

As this tends to reduce the rotation of the polarization of the incident light, and the device appears gray.

But if the applied voltage is large enough, the liquid crystal molecules in the center of the layer are almost completely peeled and the polarization of the incident light is not rotated as it passes through liquid crystal layer.

So this light is mainly polarized perpendicular to the second filter, and so will be blocked and the pixel appears black.

Since the control voltage applied across the liquid crystal layer in each pixel, light can be allowed to pass through different amounts, becoming various shades of gray.

Thus functions are complex or the lcd because the optical effect of a device twisted nematic (TN) in the voltage state is much less dependent on variations in the thickness of the device in the state voltage compensation.

But because of this, these devices are used between crossed polarizers so that they appear bright with no voltage (the eye is more sensitive to variations in the dark state in the bright).

is for this reason that LCDs are very good and the screen has one of the Best Available resolutions.