What to pay attention to when using LCD screen:
1. The LCD screen should be protected from being driven by DC voltage. The smaller the DC component of the voltage, the better. Do not exceed 50mV at most. Long-term application of excessive DC components will cause electrolysis and electrode aging, which will reduce the life.
2. The liquid crystal display should be protected from ultraviolet radiation: liquid crystal and polarizers are organic, and photochemical reactions and degradation will occur under ultraviolet radiation. Therefore, when the liquid crystal display device is assembled, it should be considered whether it is necessary to install a protective device on the front according to its purpose and use environment. UV filters or other UV protection methods. Avoid long-term direct sunlight when using it.
LCD
3. The liquid crystal display should be protected from the corrosion of harmful gases: the liquid crystal and polarizers are organic and chemically reacted and deteriorated in the environment of harmful gases. Therefore, isolation measures for harmful gases should be taken in use. In addition, after the whole machine is assembled, Do not carry out long-term sealed storage to prevent the excessive concentration of chemical gas generated by the plastic casing and circuit board cleaning agent from damaging the liquid crystal and polarizer.
4. The liquid crystal display device is made of two pieces of glass, with only 5~10um between them, which is very thin. Moreover, the inner surface of the glass is coated with a layer of oriented film, which is easy to damage. Therefore, the following points should also be noted: Do not apply excessive pressure on the surface of the liquid crystal device to avoid damage to the alignment layer. In case of excessive pressure or hand-pressing of the device during the assembly process, it shall be allowed to stand for an hour before turning on the power. Remember not to have drastic temperature changes during the power-on process. The pressure should be even when installing, only press the side of the device, not the middle, or tilt and force.
5. Because the liquid crystal state will disappear if it exceeds a certain temperature range, it must be stored and used within the specified temperature range. If the temperature is too high, the liquid crystal state will disappear and become liquid, the display surface will be black, and it will not work. Please be careful not to power on at this time, and it can recover by itself after the temperature drops. If the temperature is too low, the liquid crystal begins to freeze, causing permanent damage. In addition, if stored at extreme temperatures for a long time or subjected to vibration or shock, the LCD will also generate bubbles.
6. Prevent glass breakage: Since the display device is made of glass, if it is lost, the glass will definitely break. Therefore, the assembly method and the vibration and impact resistance of the assembly must be considered when the whole machine is designed.
7. Moisture-proof of the device: Due to the low voltage and low power consumption of the liquid crystal display device, the resistivity of the liquid crystal material is extremely high (up to 1X1010Ω). Therefore, due to the conduction of the glass surface caused by moisture, the phenomenon of "stringing" between the segments may occur when the device is displayed, so the design of the whole machine must consider moisture-proof. In normal times, try to place it at a temperature of 5-30°C and a humidity of 65%.
8. Handling and cleaning of the liquid crystal display device: Since the surface of the liquid crystal is made of plastic polarizers and reflectors, it is soft and easy to scratch, so be careful when handling and assembling to prevent the LCD from colliding with each other and causing glass breakage And scratches, so that employees can clean up broken glass and other debris on the countertop in time. The LCD screen has a protective film on the polarizer before leaving the factory, and it is removed before assembling the product. If there is no transparent protective cover on the surface of the LCD screen on the finished product, a protective film should be pasted on the surface of the screen.
When there are impurities on the surface of the LCD screen, you can blow it first. If it can’t be blown off, use a soft muslin, dust-free cloth or cotton to wipe it gently. If you must use a solvent for cleaning, you can only use isopropanol (glycerin), alcohol, and Freon, but not water, acetone, or aromatic solvents such as toluene, otherwise the polarizer on the surface of the device will be damaged. If water droplets stay on the LCD module for a long time, it may cause discoloration or stains, so be sure to clean it in time.
9. If it is a liquid crystal display with metal pins, when soldering the pins, the solder joints should be 4mm or more away from the root, and they should not be subjected to excessive force or overheating to avoid damage to the connection. Soldering iron temperature: 280±10℃ Welding time: <3 S; Soldering material: eutectic, low melting point; repeated soldering shall not exceed 3 times.
The above content is an introduction to what you should pay attention to when using LCD screens. In addition, it is prohibited to use organic chemical solvents such as alcohol, or rough cloth or paper, because these substances are prone to scratches and affect the display. Effect. Also be careful not to spray the cleaning agent directly on the surface of the LCD screen, so that the cleaning agent can easily flow into the screen, causing a short circuit inside the LCD screen and causing damage to the machine.
