LCD introductory knowledge

The liquid crystal composition:

lcd module liquid crystal used, generally refers to a mixed liquid crystal, liquid crystal monomer by a variety of chiral agent and mixed together.
The liquid crystal characteristics:
TN liquid crystal generally shorter molecular chains, the characteristic parameter adjustment more difficult, so the difference is more obvious characteristics. STN STN liquid crystal display data through the model to calculate the required length of the liquid crystal molecules, and the optical electrical performance parameters, and chemical synthesis of a variety of molecular chain structure similar to the polar molecular groups with different monomers each formulated into a characteristics similar series of LCD. Different series of the STN liquid crystal molecules tend to have a completely different chains, therefore, different series of the STN liquid crystal manufacturer's instructions unless deploy each other, but not mutually deployment.
Liquid crystal molecules have polar groups and non-polar groups, with polar groups molecules of the liquid crystal monomer mixture mainly determined by the threshold voltage of the liquid crystal parameters, non-polar groups of the liquid crystal monomer molecules The refractive index of the liquid crystal mixture of major decisions and clearing points. Liquid crystal monomers with polar groups and non-polar group-containing monomer in static conditions will occur isomers chromatography homosexual phenomenon.
In order to increase the standby time of the machine itself and enhanced drive capability of the liquid crystal display, TFT LCD Display manufacturers have developed to meet the low voltage and low frequency conditions, low threshold voltage of the liquid crystal used. It has the following features:
Low threshold voltage liquid crystal monomers with polar groups and non-polar group-containing monomer in standing condition isomers chromatography homosexual phenomenon appears shorter time.
More polar group-containing monomer component, also means easier with the liquid crystal molecules, and other polar water-free ions, thereby reducing the resistance of the liquid crystal capacitance, causing increased leakage current and power dissipation large.
When the polarity of the liquid crystal monomer molecular chains in the ultraviolet intensified after the polar molecular groups easily intertwined to form neutral molecules, into a non smectic wrong to state, resulting in the threshold voltage increases, the guide layer anchor given effect is not sensitive to loss of low-voltage drive capability.