Long strip LCD is one of the LCD products, but in the LCD industry, it is generally known as pattern LCD, pen segment LCD, monochrome LCD, color matrix LCD, etc.
And industrial LCDs contain two delicate sodium-free glass materials with a layer of liquid crystal sandwiched between them. When a light beam passes through this layer of liquid crystals, the liquid crystals themselves stand in rows or twist irregularly, thus blocking or allowing the light beam to pass smoothly. Most liquid crystals are organic compounds, consisting of long rod-like molecules. In their natural state, the long axes of these rod-like molecules are roughly parallel. When liquid crystals are poured into a machined slotted plane, the liquid crystal molecules are aligned along these slots, so if these slots are very parallel, the molecules will also be parallel.
Nowadays, LCDs are more and more widely used in instruments, medical equipment, communication equipment, industrial equipment and various office equipment, and have been integrated into people's daily life and work. So, what happens to the LCD screen if the working temperature is too high or too low?
1、The Effect of High Temperature
(1) Liquid crystal displays are usually encapsulated in silicone. If the working temperature exceeds the solid phase transition temperature (generally 125°C), the encapsulated material will change to a rubbery state and rapidly accelerate thermal expansion, leading to open-circuit failure of the LCD.
(2) When the operating temperature of the LCD exceeds the high load temperature of the chip, its light-emitting rate will drop rapidly, leading to light decay. Then the life of the LCD is reflected by light decay, which is what we usually say LCD screen brightness will become increasingly low after a long period of use.
2. The Impact of Low Temperature
(1) As the temperature increases, the concentration of free electrons and holes increases, the gap width decreases, and the electron mobility decreases.
(2) High temperature will shift the blue peak of the chip to the long-wave direction, so that the wavelength of the chip does not match the wavelength of the phosphor, thus reducing the efficiency of the light coming out of the outside of the LCD.
(3) When the temperature rises, the quantum efficiency of phosphor decreases and the luminescence of LCD decreases, resulting in lower brightness of LCD screen.
(4) Temperature has a great influence on the shape of silicone products. As the temperature increases, the internal heat of silica gel increases and the refractive index of silica gel decreases, thus affecting the luminous efficiency of the LCD screen.
