In terms of display technology, LED is a display screen composed of light-emitting diodes. Each pixel unit in LED digital display is a light-emitting diode. If it is monochromatic, it is usually a red light-emitting diode. Let's take a look at the eight LED quality assurance technologies and daily maintenance methods.

Eight technologies of LED quality assurance

1. Design current value The nominal current of the LED is 20mA, and it is generally recommended that the maximum operating current be no more than 80% of the nominal value, especially for a display with a small dot pitch, due to poor heat dissipation conditions, the current value should also be reduced . According to experience, due to the inconsistency of the attenuation speed of the red, green, and blue LEDs, the current value of the blue and green LEDs should be reduced in a targeted manner to maintain the consistency of the white balance of the display after a long period of use.

2. Drive circuit design The layout of the drive IC on the drive circuit board on the 31.25mm Foldable LED Mesh Curtain display module will also affect the brightness of the LED. Since the output current of the driver IC is transmitted over a long distance on the PCB, the voltage drop of the transmission path will be too large, which will affect the normal working voltage of the LED and reduce its brightness. We often find that the brightness of the LEDs on the four sides of the LED display module is lower than that in the middle, which is the reason. Therefore, in order to ensure the consistency of the brightness of the display screen, it is necessary to design the distribution diagram of the driving circuit.

3. Anti-static LED display electronic display assembly factories should have good anti-static measures. Special anti-static floor, anti-static floor, anti-static soldering iron, anti-static table mat, anti-static ring, anti-static clothing, humidity control, equipment grounding (especially the cutting machine), etc. .

4. Mixed lights LEDs of the same color with different brightness levels need to be mixed lights, or the lights should be inserted according to the light insertion diagram designed by discrete rules, so as to ensure the consistency of the brightness of each color on the entire screen. If there is a problem in this process, the local brightness of the display screen will be inconsistent, which will directly affect the display effect of the LED display screen.

5. Control the verticality of the lamp. For in-line LEDs, there must be sufficient technology to ensure that the LEDs are perpendicular to the PCB board when passing the furnace. Any deviation will affect the brightness consistency of the LEDs that have been set, and color blocks with inconsistent brightness will appear.

6. False welding control When the LED display does not light up, there is a probability of more than 50% that it is caused by various types of false welding, such as false welding of LED pins, virtual welding of IC pins, and false welding of pin headers. Wait. The improvement of these problems needs to be solved by strictly improving the process and strengthening the quality inspection. The vibration test before leaving the factory is also a good inspection method.

7. The temperature and time of wave soldering must be strictly controlled. The temperature and time of wave soldering must be strictly controlled. It is recommended that the preheating temperature be 100°C±5°C, and the maximum temperature should not exceed 120°C. The temperature is 245°C±5°C, and the soldering time is recommended not to exceed 3 seconds. Do not vibrate or impact the LED after the furnace, until it returns to normal temperature. The temperature parameters of the wave soldering machine should be checked regularly, which is determined by the characteristics of the LED. Overheating or fluctuating temperature will directly damage the LED or cause hidden dangers to the quality of the LED, especially for small-sized round and oval LEDs such as 3mm.

8. Heat dissipation design The LED will generate heat when it is working, and if the temperature is too high, it will affect the attenuation speed and stability of the LED. Therefore, the heat dissipation design of the PCB board and the ventilation and heat dissipation design of the box will affect the performance of the LED.

LED daily maintenance methods

The increase in the use of LED liquid crystal displays, on the one hand, is due to the fact that major manufacturers have reduced the work materials of the products in order to control production costs, which has led to the premature aging of a few parts of some products; on the other hand The reason is due to the user's inappropriate usage habits. In particular, the latter situation is more common, most users do not know how to use and maintain LED LCD monitors correctly.

1. Maintain the humidity of the environment

Anyone who has ever damaged a keyboard by spilling water on it knows this common sense. Don't let anything with moisture nature get into your LED display. If fog is found, wipe it off with a soft cloth before turning on the power. If moisture has entered the display, the display must be placed in a warmer, dry place to allow the moisture and organic compounds to evaporate. Applying power to a liquid crystal display that contains humidity can cause corrosion of the liquid crystal electrodes and cause permanent damage.

2. Broken screen problem

To avoid possible problems, we can choose passive protection and active protection. Passive protection means that users in some public places such as Internet cafes and dormitories can choose to purchase displays with tempered glass, which can make your display "invulnerable, "Water and fire are not invaded", but it will affect the color of the display, and there will be reflections; while active protection is to be careful in daily use, try to keep items that may cause damage to the screen away from the screen, and clean the screen When cleaning, wipe as gently as possible to minimize the possibility of injury.

3. Routine maintenance

LCD monitors are most closely related to our users, and it is also very necessary to do a good job in cleaning and sanitation. In fact, the LCD is also very easy to get dirty. The white appearance is indeed good-looking, but if you do not pay attention to maintenance, it will soon turn yellowish; the piano paint is really good, but after a week of use, the shell must be full Fingerprints; even if it is an ordinary black matte material, after a period of time, there must be dust on the screen.

You can buy some well-known brands of cleaning kits. Of course, if you want to save money, you can make do with clean water, which is better than cleaning solutions from unknown sources. At the same time, one thing to pay attention to is that you must not spray water on the screen, but spray a little cleaning solution on the cleaning cloth, and then gently wipe it in the same direction. Before cleaning, you need to clean the power cord. pull it out. Good cleaning cloth is also very particular. It must be a product made of ultra-fine fiber. Generally, the glasses cloth provided by high-end glasses can also be used as a cleaning cloth.

For most LED-backlit displays, their most vulnerable part is the screen. Generally, the hardness of the screen is below 3H (the hardness of a pencil lead). Damage means that this LED display is basically scrapped.