Topsled design of full-color LED display
Send date: 2013-04-12 14:34

 Points to note in the design of full-color LED display


LED display screen and other items, use inevitably encounter this or that problem and Notes


1, anti-static



LED screen assembly plant should have a good anti-static measures. Dedicated anti-static, anti-static flooring, anti-static soldering iron, anti-static table mat, anti-static ring, anti-static clothing, humidity control, equipment grounding (especially cut legs), are the basic requirements, and use electrostatic analyzer periodic testing .
2, the design of the current value
The nominal current of the LED is 20mA, the generally recommended its maximum current does not exceed the nominal value of 80%, and especially for small 
LED screen dot pitch, due to poor heat radiation conditions should reduce the current value. According to the experience, because the red, green, and blue LED decay rate inconsistency in a targeted manner to reduce the blue and green LED current value, in order to maintain the consistency of the white balance in the display after prolonged use.
3, the thermal design
LED work may have a fever, temperature will affect the speed and stability of LED attenuation, so the PCB thermal design, the cabinet ventilation design will affect the performance of LED.
4, the driving circuit design
The drive circuit board on the display module driver for the arrangement of the IC will also affect the brightness of the LED. Driver IC output current in the PCB transmission distance is too far, so that the transmission path voltage drop is too large, resulting in a decrease in brightness affect the normal operating voltage of the LED. We often found around the LED brightness of the display module is lower than the middle, and this is why. Therefore, to ensure the consistency of the brightness of the display, it is necessary to design a driver circuit maps.
5, mixed lights
Different brightness profile of the same color need mixed LED lights, or in discrete laws designed insert lights Figure insert lights, to ensure the consistency of the entire screen for each color brightness. If there is a problem in this process, there will be the local display brightness inconsistent phenomenon, directly influence the display of the 
LED display.
6, the control of the vertical degree of the good light
For DIP LED, through the furnace have the technology to ensure that the LED perpendicular to the PCB board. Any deviation will affect the already set LED brightness consistency, inconsistent brightness blocks of color.
7, wave soldering temperature and time
To strictly control the good wave front welding temperature and time of the furnace, it is recommended that: preheating temperature of 100 ° C ± 5 ° C, the maximum does not exceed 120 ° C, and the preheating temperature rise for a smooth, soldering temperature of 245 ° C ± 5 ° C, and welding time is recommended that no more than three seconds, the furnace should not vibration or shock 
LED display screen until the resumption of normal temperature state. The temperature parameters of the wave soldering machine to regular testing, which is determined by the characteristics of LED, overheating or temperature fluctuations will directly damage the LED or cause the LED quality risks, especially for the small size as 3mm round and oval LED.
8, Weld control
LED display, the LED is not lit, often more than 50% probability caused by various types of Weld, such as LED pin Weld, IC pin Weld, needle row mother Weld and so on. The improvement of these issues need rigorous process to improve and strengthen the quality inspection. Vibration testing before the factory is also regarded as a good testing method.


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