LED display strictly abide by the following eight rules, the quality of the display produced is top-notch, obtained the quality of ISO9002 certification, we are dedicated to provide customers with the best LED electronic display products! 1. Anti static display assembly plant should have good
LED display strictly abide by the following eight rules, the quality of the display produced is top-notch, obtained the quality of ISO9002 certification, we are dedicated to provide customers with the best LED electronic display products!
1. Antistatic
Display assembly plant should have good anti-static measures. Special anti-static ground, anti-static floor, anti-static soldering iron, anti-static pad, anti-static ring, anti-static clothing, humidity control, equipment grounding (especially foot cutting machine) are the basic requirements, and they should be tested regularly with an electrostatic meter.
2. Design of driving circuit
The layout of the driver IC on the display module will also affect the brightness of the LED. Due to the long transmission distance of driving IC output current on PCB, the voltage drop of transmission path will be too large, which will affect the normal working voltage of LED and reduce its brightness. We often find that the LED brightness around the display module is lower than that in the middle, which is the reason. Therefore, in order to ensure the consistency of the brightness of the display screen, it is necessary to design the distribution diagram of the driving circuit.
3. Design current value
The nominal current of LED is 20mA, and it is generally recommended that the maximum current should not exceed 80% of the nominal value. Especially for the display screen with small spacing, the current value should be reduced due to poor heat dissipation conditions. According to the experience, due to the inconsistency of attenuation speed of red, green and blue LEDs, the current value of blue and green LEDs should be reduced to maintain the consistency of white balance after long-term use.
4. Mixed lamp
Led with the same color and different brightness levels need to mix lights, or plug lights according to the discrete design of the light plug diagram, in order to ensure the consistency of the brightness of each color in the whole screen. If there is a problem in this process, the local brightness of the display will be inconsistent, which will directly affect the display effect of the LED display.
5. Control the verticality of the lamp
For the direct plug-in led, there should be enough technology to ensure that the LED is perpendicular to the PCB. Any deviation will affect the LED brightness consistency that has been set, and the color block with inconsistent brightness will appear.
6. Temperature and time of over wave soldering
7. False welding control
When the LED is not on, there is often more than 50% probability that it is caused by various types of false soldering, such as LED pin false soldering, IC pin false soldering, pin and bus false soldering, etc. These problems need to be solved by strictly improving the process and strengthening the quality inspection. The vibration test before delivery is also a good inspection method.
8. Heat dissipation design
When LED works, it will generate heat. If the temperature is too high, it will affect the attenuation speed and stability of LED. Therefore, the heat dissipation design of PCB board and the ventilation and heat dissipation design of box will affect the performance of LED.
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