Display assembly plant should have good anti-static measures. Anti-static floor, anti-static floor, anti-static iron, anti-static pad, anti-static ring, anti-static clothing, humidity control, grounding equipment (especially cut feet) are all basic requirements, .
2, wave soldering temperature and time
We must strictly control the wave front welding temperature and over the furnace time, the proposal is: Preheat temperature of 100 ℃ ± 5 ℃, the maximum does not exceed 120 ℃, and the preheat temperature rise requires steady, the welding temperature of 245 ℃ ± 5 ℃, welding Time is not recommended for more than 3 seconds, after the furnace should not be vibration or impact LED, until the return to normal temperature. Wave soldering machine temperature parameters to be detected regularly, which is determined by the characteristics of the LED, overheated or fluctuating temperature will directly damage the LED or LED quality problems, especially for small size such as 3mm round and oval LED.
3, design current value
LED nominal current of 20mA, the general recommended maximum current of not more than 80% of the nominal value, especially for small screen spacing, due to poor cooling conditions, but also reduce the current value.
According to experience, due to the red, green and blue LED attenuation rate of inconsistencies, targeted to reduce the current value of blue and green LED in order to maintain the consistency of the white balance after long-term use of the display.
4, mixed lights
LEDs of the same color and different brightness levels need to be mixed with lights or inserted into the light pattern according to the discrete rules to ensure the consistency of brightness of each color of the entire screen. This procedure if there is a problem, there will be inconsistencies in the brightness of the local display, a direct impact on the LED display.
5, control the lamp verticality
For in-line LED, over the furnace when there must be sufficient technology to ensure that the LED perpendicular to the PCB board. Any deviation will affect the already set LED brightness consistency, there is inconsistent brightness of the color.
6, thermal design
LED work will be fever, the temperature is too high will affect the decay rate and stability of the LED, so PCB thermal design, ventilation and cooling cabinet design will affect the performance of LED.
7, Weld control
LED display appears in the LED is not bright, there are often more than 50% probability of various types of Weld caused, such as the LED pin Weld, IC pin Weld, Pai Pai Weld and so on. The improvement of these issues needs to be strictly solved by improving the technology and strengthening the quality inspection. Vibration test before leaving the factory is a good test method.
8, drive circuit design
The layout of the drive circuit board driver ICs on the display module also affects the brightness of the LEDs. As the driver IC output current on the PCB board transmission distance is too far, will make the transmission path pressure drop is too large, affecting the LED's normal operating voltage causes its brightness to decrease. We often find the LED display module around the lower brightness than the middle, is the reason. Therefore, to ensure the consistency of the display brightness, it is necessary to design a good drive circuit profile.
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