During the production process? Factors that are easily overlooked in full-color LED screens

Full-color LED screens, like other electronic products, will encounter some neglected factors in the production process that lead to adverse consequences. Full-color LED screens are precision products. In order to maximize the display effect of LED screens, the longest life of full-color LED screens requires Work hard. False welding control: When the full-color LED screen 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, IC pins, and 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 of the full-color LED screen before leaving the factory is also a good inspection method. Mixed lights: LEDs of the same color with different brightness levels need to be mixed, or inserted according to a discrete pattern designed to ensure the consistency of the brightness of each color of the entire LED module. If there is a problem in this process, the local brightness of the full-color LED screen will be inconsistent, which will directly affect the display effect of the full-color LED screen. Heat dissipation design: LEDs will generate heat during operation, and excessive temperature will affect the attenuation speed and stability of LEDs. Therefore, the heat dissipation design of the PCB board and the ventilation and heat dissipation design of the cabinet will affect the performance of the LED screen. Driving circuit design: The layout of the driving IC on the driving circuit board on the full-color LED screen 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 module and reduce its brightness. We often find that the brightness of the LEDs around the full-color LED screen module is lower than that in the middle, which is the reason. Therefore, in order to ensure the consistency of the brightness of the full-color LED screen, it is necessary to design the distribution diagram of the driving circuit. 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 during the furnace. Any deviation will affect the brightness consistency of the LED screen that has been set, and color blocks with inconsistent brightness will appear. Anti-static: full-color LED screen 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. LED modules. Design current value: The nominal current of the LED is 20mA. It is generally recommended that the maximum operating current should not exceed 80% of the nominal value. Especially for full-color LED screens with small dot spacing, the current should be reduced due to poor heat dissipation conditions. value. According to experience, due to the inconsistency of the attenuation speed of red, green, and blue LEDs, the current value of blue and green LEDs should be reduced in a targeted manner to maintain the consistency of the white balance of the full-color LED screen after a long period of use. Wave soldering temperature and time: The temperature and time of wave front 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. 245°C±5°C, the soldering time is recommended not to exceed 3 seconds, and the LED module must not vibrate or impact the LED after it has passed 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. For more information, please continue to visit Shenzhen Lianhui Industry News Full Color LED Screen Knowledge. It is inevitable to encounter such or such problems and precautions during use. When using a full-color LED screen, it may be difficult or affect the use of the large screen due to negligent matters, and can prolong its service life. .