Liquid crystal mixture preparation TFT Display Module

a. A liquid crystal composition and the requirements of a monomer preparation and composition of the mixed liquid crystal display device based solely determined by the requirements, generally speaking, TN device used for material requirements is relatively low, can be used, and for the preparation of such liquid crystalline monomer. Of course, a wide temperature range, low threshold voltage to increase a TN display materials, such as monomer. TFT Display Module
STN-LCD liquid crystal material properties required to be higher, usually a monomer selected of the following categories:
(A) phenyl cyclohexane type generally have lower viscosity of these compounds, such as molecular structure having three or more rings, the clearing point is high, increase in the modulation plays a clearing point temperature.
(B) biphenyl, pyrimidine and acetylenes because they have higher refractive index, can be prepared in a mixed system Δn desired value.
(C) contains a non-aromatic ring and a short-chain alkyl or alkoxy groups of liquid crystal compounds are typically large K33/K11 values.
(D) ethane compound has low viscosity class.
Most of the current super-twisted material selection phenyl cyclohexane classes and ethane-based liquid crystal as the main ingredient.
An active matrix display (AM-LCD) require higher liquid crystal material, in addition to low viscosity, but also requires a high resistivity, high charge retention and suitable dielectric anisotropy. Many of the current synthetic fluorinated liquid crystal material can basically meet its requirements.
b. In general mixing method, first select the appropriate low melting and nematic liquid crystal as a basic mixture ranges, some of which may be polar, non-polar other, which allows to change Δε; taking care to avoid generating near crystalline phase. These components should be selected by the requirement Δn control. If required low threshold, then the mixture should be added to the basic compound high Δε value. So, Δε / ε ⊥ adjustment ratio is even more difficult, but can also be added to change their materials. Then, often use additives to improve the definition highlights mixture clearing point. After several repeated so you can get the recipe mixture. Wherein each of the mixture components are to contribute to the final properties. Character LCD Display
Mixture formulation can also use the addition rule, based on the device performance and the relationship between material parameters, using a linear induction election to be determined by its optimization.
In the mixed crystal, due to the viscosity of the liquid crystal is relatively large (some are solid at room temperature), it must be heated to a crystal clear point, with mechanical stirring, magnetic stirring or ultrasonic methods such as mixed evenly. Stirring should be dust, moisture or dry protective atmosphere.