LED display in public places with a wider range of applications, the square on the big screen for the LED screen, with long life, low energy consumption and so on. LED display in the design if not appropriate, will affect the future use of this article summed up the eight factors in the LED screen design need to pay attention to:
1, thermal design
led work will be hot, the temperature will affect the impact of the decay speed and stability, so the PCB board thermal design, the cabinet ventilation design will affect the performance of LED.
2, mixed lights
The same color of different brightness of the LED lights need to be mixed 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 large-screen local brightness inconsistencies, a direct impact on the big screen led display.
3, 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 screen, due to poor heat conditions, but also reduce the current value. According to experience, due to red, green, blue LED attenuation speed inconsistency, targeted to reduce the blue and green LED current value, in order to maintain long-term use of large-scale white balance after the consistency.
4, drive circuit design
Large circuit modules 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 voltage drop is too large, affecting the normal operating voltage LED lead to its brightness reduced. We often find large-screen module around the LED brightness lower than the middle, is the reason. So to ensure the consistency of large-screen brightness, we must design a good drive circuit distribution.
5, control the light of the vertical
For in-line LEDs, there is sufficient technology to ensure that the LEDs are perpendicular to the PCB. Any deviation will affect the already set the LED brightness consistency, there is inconsistent brightness of the color block.
6, Weld control
led large screen in the absence of LED does not shine, often have more than 50% probability for all types of Weld caused by, such as LED pin Weld, IC pin Weld, row pin row of Weld and so on. The improvement of these problems requires a rigorous improvement in the process and a strengthening of the quality inspection. The vibration test at the factory is also a good test method.
7, over wave soldering temperature and time
It is necessary to strictly control the temperature and furnace time of the wave front welding. It is recommended that the preheating temperature be 100 ℃ ± 5 ℃ and the maximum temperature should not exceed 120 ℃, and the preheating temperature should be stable, the welding temperature is 245 ℃ ± 5 ℃, Time recommended no more than 3 seconds, after the furnace should not vibration or impact LED, until the resumption of room temperature. 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.
8, anti-static
led large-screen assembly factory should have a 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) and so are the basic requirements, and use static meter The For more information, please continue to visit the China logo network industry information channel led display offer.