"Eight technical controls to ensure the quality of LED displays"

In today's digital era, LED displays have become indispensable in many fields with their excellent display effects and wide application scenarios. However, to achieve excellent quality of LED displays, strict and precise technical control is required in many aspects.

其一，防静电措施至关重要。In the LED display electronic display assembly factory, a good anti-static environment is indispensable. Including special anti-static ground, anti-static floor, anti-static iron, anti-static table mat, anti-static ring, anti-static clothes, etc. At the same time, it effectively controls humidity and ensures that equipment is grounded, especially equipment such as foot cutting machines. Moreover, it is necessary to use a static meter for regular testing to maintain a stable anti-static state, because the damage caused by static electricity to the LED display cannot be ignored.
Second, the design of the driving circuit directly affects the performance of the LED display. The arrangement of the driver ICs on the driver circuit board on the LED display module will have a significant impact on the brightness of the LEDs. When the transmission distance of the drive IC output current on the PCB board is too long, it will cause excessive voltage drop on the transmission path, which will affect the normal working voltage of the LED and reduce its brightness. This is why we often find that the brightness of the LEDs around the LED display module is lower than that in the middle. Therefore, in order to ensure the consistency of the brightness of the display screen, the distribution diagram of the driving circuit must be carefully designed.
Third, reasonable design of current values is a key step. The nominal current of an LED is generally 20mA, but it is generally recommended that its maximum current should not exceed 80% of the nominal value. Especially for displays with small dot spacing, due to relatively poor heat dissipation conditions, the current value should be appropriately reduced. Based on the inconsistency of the decay speeds of red, green and blue LEDs, targeted reduction of the current values of blue and green LEDs can effectively maintain the consistency of the white balance of the display after long-term use.
Fourth, the light mixing link cannot be ignored. For LEDs of the same color but different brightness levels, scientific light mixing operations are needed, or light insertion patterns designed according to discrete rules can be carried out. Only in this way can the consistency of the brightness of each color on the entire screen be ensured. If a problem occurs in this process, it will lead to inconsistent local brightness of the display, which will directly and seriously affect the display effect of the LED display.
Fifth, controlling the verticality of the lamp is crucial for in-line LEDs. When passing through the furnace, sufficient process technology must be available to ensure that the LED is perpendicular to the PCB board. Any slight deviation may affect the consistency of the set LED brightness, resulting in color blocks with inconsistent brightness, which greatly affects the overall effect of the display.
Sixth, the temperature and time of wave soldering need to be strictly controlled. It is recommended that the preheating temperature be 100℃ 5℃, and the maximum shall not exceed 120℃, and the rise of the preheating temperature should be smooth. The welding temperature is 245℃ 5℃, and the welding time is recommended to not exceed 3 seconds. Avoid vibrating or impacting the LED after passing the furnace until it returns to normal temperature. The temperature parameters of the wave soldering machine must be tested regularly, which is determined by the special nature of the LED. Overheating or fluctuating temperature can directly damage the LED or cause hidden problems of the LED's quality, especially for small size LEDs such as 3mm round and oval shapes, you must be extra careful.
Seventh, the control of false welding is a key point. When the LED does not light up on the LED display, there is often a probability of more than 50% caused by various types of virtual soldering, such as virtual soldering on LED pins, virtual soldering on IC pins, and virtual soldering on pins and sockets. To improve these problems, we need to strictly improve the process and strengthen quality inspection. Vibration testing before leaving the factory is also an effective inspection method that can detect potential weld defects in advance.
Eighth, the heat dissipation design cannot be sloppy. LEDs will heat when working, and too high a temperature 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 have an important impact on the performance of the LED. Reasonable heat dissipation design can ensure long-term stable operation of the LED display and reduce failures and performance degradation caused by temperature problems.
In short, ensuring the quality of LED displays is a complex and meticulous process. These eight technical control points complement each other, and no loss can be allowed in every link. Only by achieving the ultimate in all aspects can we truly produce LED displays with excellent quality, stable performance, and excellent display effects to meet various needs in different scenarios. Today, with the continuous development of technology, continuous attention to and optimization of these technical control measures will help promote the continuous development of the LED display industry.