The "liquid crystal" inside the LCD screen plays a significant role as one of the three main materials of the LCD screen.
Basic concepts of LCD screens
Liquid crystal as a new physical form. Discovered by Austrian scientist Friedrich Reinitzer in 1888. When a substance is heated to the point where its crystal melts, it becomes a milky white turbid liquid and continues to be heated, while the milky white liquid becomes a completely transparent liquid. This phenomenon also occurs during the cooling process. Observing with a polarizing microscope, it was found that this milky white liquid is different from ordinary liquids in that it exhibits optical anisotropy, meaning that molecules in the object are arranged in an orderly manner. Unlike traditional concepts of solids and liquids, it is defined as a liquid crystal.
The main uses of LCD characteristics are:
① Relative temperature T: It is necessary to ensure that the entire system is in the required temperature range and there is no crystallization or other phase states, such as near crystalline phase;
② Dielectric constant Δ ε: Adjust Δ ε to meet the user's requirements for threshold voltage;
③ Optical anisotropy Δ n: Adjust Δ n to meet users' requirements for different box thicknesses;
④ Pitch P: The important parameters are to determine the box thickness and the amount of chiral agent added
33 Precautions for using LCD
⑴ The impact of ultraviolet radiation
Breaking the C-C bond and breaking the polymer C chain can affect the aforementioned properties;
⑵ The influence of temperature
Liquid crystals are less sensitive to temperature than to ultraviolet radiation. During use, the heating time of the LCD should be minimized as much as possible to avoid heating to higher temperatures, if not higher than 35 ℃ above the bright spot.
⑶ Impact on the environment
Due to the resistivity of the liquid crystal being 1011-1012, a small amount of conductive material is sufficient to reduce the resistivity Ω/cm2,
The impact of containers
It is best to use hard glass, a high silicon boron glass. Ordinary glass bottles are made of sodium glass, and the resistivity of the liquid crystal stored in the glass container is reduced.
The best conditions for storing LCD screens are sealing, avoiding light, drying, and room temperature.