8 to ensure good control of large LED display quality technology

Produce good quality led display, need to make technology control the following aspects:
1, anti-static LED electronic display screen assembly plant was should have good anti-static measures. Special anti-static, anti-static flooring, anti-static soldering iron, anti-static pad, anti-static ring, anti-static clothing, humidity control, equipment grounding (especially cut legs) are all basic requirements, and regular tests to use static analyzer .
2, the driving circuit on the module led display driver IC driving circuit board will also affect the arrangement of LED brightness. The driver IC output current in the PCB, the transmission distance is too far, will make the transmission path pressure drop is too large, affecting the normal LED operating voltage leads to decrease in brightness. We often find that led around the LED brightness display module is lower than the middle, that is the reason. Therefore, the display brightness to ensure consistency, we must design a good distribution of drive circuit.
3, the nominal design current LED current is 20mA, the maximum use of current general recommendation of not more than 80% of the nominal value, especially for small screen spacing, due to poor heat dissipation, but also reduce the current value . According to experience, because the red, green and blue LED decay rate of the inconsistency, targeted to reduce the blue and green LED's current value, in order to maintain the white balance after the prolonged use of display consistency.
4, mixing lights of different brightness of the same color need to mix light LED file, or inserted in discrete laws designed to plug lights lighting plan to ensure that the entire screen brightness of each color consistency. If you have problems in this process, there will be displays of local brightness inconsistency, led directly affect the display screen.
5, control the lights for the vertical-line LED, when the furnace should be sufficient to ensure that LED technology is perpendicular to PCB. Any deviation will affect the already set LED brightness consistency, appear inconsistent brightness of color.
6, wave soldering temperature and time had to be strict control of the temperature wave front and the furnace welding time, it is recommended as follows: preheating temperature of 100 ℃ ± 5 ℃, the maximum does not exceed 120 ℃, and the preheating temperature rise for a smooth, welding temperature to 245 ℃ ± 5 ℃, welding time recommended no more than 3 seconds after the furnace vibration or shock should not LED, until the resumption of normal temperature. Wave soldering machine to periodically test the temperature parameter, which is determined by the characteristics of LED, overheating, or fluctuations in temperature will cause direct damage to the LED or LED quality problems, especially for small size, such as circular and oval 3mm lcd module display.
7, Weld control led display lcd module serial is not lit in the event, often more than 50% probability caused by various types of cold solder joint, such as the LED pin Weld, IC pin Weld, Pai Pai mother Weld and so on. These issues are needed to improve and strengthen the strict quality inspection to improve the process to resolve. Vibration test before leaving the factory also be a good test method.
8 LED thermal design work will be heated, the temperature is too high will affect the speed and stability of the attenuation LED, so the PCB board thermal design, thermal design of the ventilation box will affect LED performance.