1.Anti-static LED display assembly factory should have good anti-static measures. Dedicated anti-static, anti-static floor, anti-static soldering iron, anti-static pad, anti-static ring, anti-static clothing, humidity control, equipment grounding (especially cut foot machine) are basic requirements, and use static The
2, mixed lights with a different color of the brightness of the LED file need to mix the lights, or in accordance with the discrete rules of the design of the lights to plug the lights to ensure that the brightness of each screen uniformity of each color. This process if there is a problem, there will be inconsistencies in the display local brightness of the phenomenon, a direct impact on the LED display display.
3, drive circuit design LED display module on the drive circuit board driver IC arrangement will also affect the brightness of the LED. As the driver IC output current on the PCB board transmission distance is too far, will make the transmission path pressure drop is too large, affecting the normal operating voltage LED lead to its brightness reduced. We often find LED display module around the LED brightness lower than the middle, is the reason. It is necessary to ensure the consistency of the display brightness, we must design a good drive circuit distribution.
4, Weld-out control LED display in the LED does not shine, often more than 50% probability for all types of Weld caused by, such as LED pin Weld, IC pin Weld, Wait. The improvement of these problems requires a rigorous improvement in the process and the strengthening of the quality inspection. The vibration test at the factory is also a good test method.
5, wave soldering temperature and time to strictly control the wave front welding temperature and furnace time, the proposed: preheating temperature of 100 ℃ ± 5 ℃, the maximum does not exceed 120 ℃, and the preheating temperature rise required smooth, welding temperature For the 245 ℃ ± 5 ℃, welding time is recommended not more than 3 seconds, after the furnace should not vibration or impact LED, until the return to normal temperature state. The temperature parameters of the wave soldering machine to be regularly tested, which is determined by the characteristics of the LED, overheating or fluctuations in the temperature will directly damage the LED or cause LED quality hazards, especially for small size such as 3mm round and oval LED.
6, thermal design LED work will be hot, the temperature is too high will affect the LED decay speed and stability, so the PCB board thermal design, the cabinet ventilation design will affect the performance of LED.
7, the design current value LED nominal current of 20mA, it is generally recommended that the maximum use of the current does not exceed 80% of the nominal value, especially for the point spacing is very small display, due to poor heat conditions, but also reduce the current value The According to experience, due to red, green, blue LED attenuation speed inconsistency, targeted to reduce the blue and green LED current value to maintain the display after a long time to use the consistency of white balance.
8, control the vertical light for the straight-through LED, the furnace should have enough technology to ensure that the LED perpendicular to the PCB board. Any deviation will affect the already set the LED brightness consistency, there is inconsistent brightness of the color block.