What technologies are involved in making indoor and outdoor LED displays?
LED display is generally used to display text, images, video, video signals and other information. Then, the following LED display manufacturers analyze the production of indoor outdoor display technology involves :
1, anti-static: LED display assembly factory should have good anti-static measures, special anti-static ground, anti-static floor, anti-static soldering iron, anti-static mat, anti-static ring, anti-static clothing, humidity control, equipment grounding ( In particular, foot cutting machines, etc. are all basic requirements, and they should be periodically checked by a static instrument.
2. Drive circuit design: The layout of the driver circuit board driver IC on the LED display module will also affect the brightness of the LED. Because the output current of the driver IC is too far on the PCB board, the transmission path pressure drop will be too large. Affects the normal operating voltage of the LED, causing its brightness to decrease. We often find that the LED brightness around the LED display module is lower than in the middle. This is the reason. Therefore, to ensure the consistency of the display brightness, it is necessary to design the drive circuit distribution diagram.
3, the design current value: LED's nominal current is 20mA, it is generally recommended that the maximum use of current is not more than 80% of the nominal value, especially for LED display with small pitch, due to poor cooling conditions, should also reduce Current value. According to experience, due to the inconsistencies in the attenuation speeds of the red, green, and blue LEDs, the current values ​​of the blue and green LEDs are purposely reduced to maintain the consistency of the white balance after the display has been used for a long time. What technologies are involved in making indoor and outdoor LED displays?
4, mixed lights: the same color of a different brightness of the LED lights need to mix, or in accordance with the discrete rules of the plug-in lamp design to insert lights, in order to ensure the consistency of the brightness of the entire screen of each color. If there is a problem in this process, there will be inconsistencies in the local brightness of the display screen, directly affecting the display effect of the LED display.
5, control the verticality of the lamp: For the in-line LED, there must be enough process technology to ensure the LED is perpendicular to the PCB board. Any deviation will affect the brightness consistency of the LED that has been set, and the color patches with inconsistent brightness appear.
6, over wave soldering: temperature and time must be strictly controlled wave front welding temperature and furnace time, it is recommended: preheating temperature 100 °C ± 5 °C, the maximum does not exceed 120 °C, and the preheating temperature rise requires a smooth, welding The temperature is 245 °C ± 5 °C, welding time is recommended not to exceed 3 seconds, after the furnace avoid vibration or shock LED, until the return to normal temperature. Wave soldering machine temperature parameters should be regularly tested, which is determined by the characteristics of the LED, overheating or fluctuating temperature will directly damage the LED or cause LED quality problems, especially for small size such as 3mm round and oval LED.
7. Weld control: When the LED display does not light up, there are often more than 50% of the probability of various types of false welds, such as LED pin Weld, IC pin Weld, pin row row mother virtual Welding and so on. Improvements in these issues need to be strictly improved and enhanced quality inspections to solve. The factory vibration test is also a good test method.
8, thermal design: LED will work when the heat, high temperature will affect the decay speed and stability of the LED, so the PCB board cooling design, ventilation and heat dissipation design of the box will affect the performance of the LED. What technologies are involved in making indoor and outdoor LED displays?
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