LED display and other items, as in the purchase and use inevitably encounter this or that problem and precautions.

1, anti-static

LED display assembly plants should have a good anti-static measures. Special anti-static, anti-static flooring, anti-static soldering iron, anti-static mat, anti-static ring, anti-static clothing, humidity control, equipment grounding (in particular cut foot) are all basic requirements, and use periodic testing electrostatic analyzer .

2, the design current value

The nominal current of the LED 20mA, is generally recommended to use the maximum current of not more than 80% of the nominal value, especially for a small screen spacing, as poor heat dissipation, but also reduce the current values. According to experience, the red, green, and blue LED decay rate of the inconsistency, targeted to reduce blue and green LED current value of the display to maintain the consistency of the white balance after prolonged use.

3, the thermal design

LED work may have a fever, high temperature will affect the speed and stability of the decay of LED, the thermal design of PCB board, cabinet ventilation design will affect the LED performance.

4, the drive circuit design

LED display module drive circuit board on the driver IC will affect the arrangement of the LED brightness. As the driver IC output current on the PCB transmission distance is too far, it will drop makes the transmission path is too large, affecting the normal operating voltage LED lead to decrease in brightness. We often find that the brightness of the LED display module four weeks is lower than the middle, is the reason. Therefore, to ensure the consistency of the display brightness, we must design a good driver circuit distribution.

5, mixed lights

The same color of the LED needs different brightness profile mixed lights, or rules designed to insert in discrete light diagram plug light to ensure that the entire screen for each color brightness consistency. This process if a problem occurs, there will be partial display brightness inconsistencies, directly affect the LED screen display.

6, the vertical control of the light and

For line LED speaking, when the furnace have enough technology to ensure LED perpendicular to the PCB board. Any deviation will affect the already set LED brightness uniformity, brightness appear inconsistent color.

7, wave soldering temperature and time

To strictly control the wave front and the furnace temperature soldering time, it is recommended as follows: preheating temperature 100 ℃ ± 5 ℃, maximum does not exceed 120 ℃, and the preheating temperature rise for a smooth, soldering temperature is 245 ℃ ± 5 ℃, welding time recommends no more than 3 seconds after the furnace avoid vibration or shock LED, until the resumption of normal state. Wave soldering machine to regularly 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 such a small size of 3mm round and oval LED.

8, Weld Control

LED display LED is not lit in the event, often more than 50% probability for all types of Weld cause, such as LED pin Weld, IC lead Weld, Weld Pai Pai mother and so on. These issues need to improve and strengthen the strict quality inspection to improve the process to resolve. Vibration testing before leaving the factory may well be a good test method.