What material is the "liquid crystal" in the LCD screen?

The "liquid crystal" in the LCD screen # 7inch lcd display # is one of the three main materials of the LCD screen # 2.1 roundTFT lcd display #, and its role is very large.

1、The basic concept of LCD screen # 5 inchTFTlcd #

Liquid crystal as a new physical form. It was discovered in 1888 by the Austrian scientist Friedrich Reinitzer. When the substance is heated until the crystal melts, it changes into a milky white turbid liquid # tft lcd panel #. If the heating continues, the milky white liquid will become a completely transparent liquid. This phenomenon also occurs during the cooling process. Observed with a polarizing microscope, it was found that this milky white liquid is different from ordinary liquids, showing optical anisotropy, that is, the molecules in the object have a certain degree of orderly arrangement, which is different from the traditional concept of solid and liquid. It is defined as liquid crystal. # 3.5 inchTFT lcd #

2. The main use of liquid crystal characteristics:

① Relative temperature T: It must be ensured that within the required temperature range, the entire system is a nematic phase, and neither crystallization nor other phases, such as smectic, can appear;

②Dielectric coefficient Δε: adjust the size of Δε to meet the user's requirements for threshold voltage;

③ Optical anisotropy Δn: adjust the size of Δn to meet the user's requirements for different box thicknesses;

④Pitch P: an important parameter to determine the thickness of the box and the amount of chiral agent added.

3. Matters needing attention in the use of LCD

(1) Influence of ultraviolet light

Destroy the C-C bond, break the polymer C chain, and affect the above properties.

(2) Influence of temperature

Liquid crystals are less sensitive to temperature than to ultraviolet light. During use, try to reduce the heating time of liquid crystals as much as possible, and avoid heating to a higher temperature, such as 35 °C higher than the clearing point.

(3) The influence of the environment

A small amount of conductive material is enough to reduce the resistivity, because the resistivity of the liquid crystal # 1.8TFT display # is 1011-1012Ω/cm2.

(4) Influence of container

The best one to use is hard glass, a high silicon boron glass. The material of ordinary glass bottles is sodium glass, and the resistivity of liquid crystals stored in glass containers will decrease.

The best storage conditions for the liquid crystal of the LCD screen: sealed, protected from light, dry, and room temperature.

Xunrui Optoelectronics focuses on the R&D and manufacturing of industrial display screens # 10.1 inchTFTlcd #, industrial touch screens and optical bonding products. The products are widely used in medical equipment, industrial handheld terminals, IoT terminals and smart homes. # 3.5 inch 480*800TFT lcd #