Tft LCD Screen Display principle

1. Liquid crystal display principle we generally think that objects have three states: solid, liquid, gaseous, in fact, this is only for water, there are some organic and material between solid and liquid in the middle of the state is the liquid crystal State, as shown below.

From the composition and appearance of liquid crystal physical conditions, liquid crystal can be divided into hot liquid crystal and soluble liquid crystal two categories:
Thermally induced liquid crystals: the heating of some organic matter dissolved, due to heating damage to the liquid crystal lattice formation of the liquid crystal.
Liquid crystal: Some organic matter in a certain solvent, due to the solvent damage to the liquid crystal lattice formed by the liquid crystal.

For the display of liquid crystal materials are thermally-induced liquid crystal, biological system there is a large number of liquid crystal, the current discovery of liquid crystal materials have nearly million, the molecules that constitute the liquid crystalline material, generally grow rod or flat shape, and in each liquid crystal phase presents a different arrangement.

The liquid crystalline phase of a liquid crystal (thermally induced liquid crystal) formed by a rod-shaped molecule is a total of three categories as shown in Fig. (b):
Near-crystal phase liquid crystal (smectic liquid crystals)
Nematic liquid crystal (nematic liquid crystals)

Cholesterol liquid crystal (cholesteric liquid crystals)

Near crystal phase liquid crystal molecule is two-dimensional order, the molecule arranges layer, this kind of liquid crystal viscosity and surface tension is bigger, to the outside electricity, magnetism, temperature change is not sensitive.
Nematic Liquid crystal molecule is a one-dimensional order, it can be up and down, left and right, before and after sliding, molecular arrangement and movement is relatively free, the external magnetic field, temperature, stress are more sensitive, is the main display of the current material.
The cholesterol liquid crystal is very much like a linear liquid crystal, but from the z axis it will be found that his pointing vector with a layer of different like spiral distribution, a certain electric field, magnetic field also make it into nematic liquid crystal.

Structure of the LCD screen

The two polarized fence angles are perpendicular to each other and the time line is completely impossible to pass, and the following is a test with polarized sunglasses.