Factors of LED screen quality
1, anti-static
Electronic display screen LED display assembly plant should have good anti-static measures. Special anti-static, anti-static flooring, anti-static iron, anti-static mat, anti-static ring, anti-static clothing, humidity control, equipment grounding (especially cut legs) are all basic requirements, and regular testing to use static analyzer .
Electronic display screen LED display assembly plant should have good anti-static measures. Special anti-static, anti-static flooring, anti-static iron, anti-static mat, anti-static ring, anti-static clothing, humidity control, equipment grounding (especially cut legs) are all basic requirements, and regular testing to use static analyzer .
2, the drive circuit design
LED display driver on the circuit board module driver IC will also affect the arrangement of the LED brightness. As the driver IC output current on the PCB transmission distance too far, will make the transmission path pressure drop is too large, affecting the normal working voltage of the LED lead to decrease in brightness. We often find that led around the LED brightness display module is lower than the middle is for this reason. Therefore, to ensure consistency of display brightness, we must design a good distribution of the drive circuit.
LED display driver on the circuit board module driver IC will also affect the arrangement of the LED brightness. As the driver IC output current on the PCB transmission distance too far, will make the transmission path pressure drop is too large, affecting the normal working voltage of the LED lead to decrease in brightness. We often find that led around the LED brightness display module is lower than the middle is for this reason. Therefore, to ensure consistency of display brightness, we must design a good distribution of the drive circuit.
3, the design of current
The nominal LED current of 20mA, is generally recommended to use the maximum current does not exceed 80% of the nominal value, especially for small spacing display, due to poor heat dissipation, but also reduce the current value. According to experience, as red, green and blue LED decay rate of the inconsistency, targeted to reduce the blue and green LED's current value, in order to maintain balance after prolonged use of display consistency.
The nominal LED current of 20mA, is generally recommended to use the maximum current does not exceed 80% of the nominal value, especially for small spacing display, due to poor heat dissipation, but also reduce the current value. According to experience, as red, green and blue LED decay rate of the inconsistency, targeted to reduce the blue and green LED's current value, in order to maintain balance after prolonged use of display consistency.
4, mixed LED lamp
File with a color different brightness of the LED lights need to mix or plug designed in accordance with the laws of 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 local display brightness inconsistencies, direct impact on the led screen display.
File with a color different brightness of the LED lights need to mix or plug designed in accordance with the laws of 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 local display brightness inconsistencies, direct impact on the led screen display.
5, the vertical degree of control the lights
For the-line LED, when the furnace technology to ensure sufficient LED perpendicular to the PCB board. Any deviation will affect the already set LED brightness uniformity, brightness appears inconsistent color.
For the-line LED, when the furnace technology to ensure sufficient LED perpendicular to the PCB board. Any deviation will affect the already set LED brightness uniformity, brightness appears inconsistent color.
6, wave soldering temperature and time
To strictly control the wave front soldering temperature and time of the furnace, it is recommended to: preheat temperature of 100 ℃ ± 5 ℃, the maximum does not exceed 120 ℃, and the preheating temperature rise for a smooth, soldering temperature of 245 ℃ ± 5 ℃, welding time recommended no more than 3 seconds after the furnace vibration or shock should not LED, until the resumption of normal temperature. Wave soldering machine to regularly test the temperature parameter, which is determined by the characteristics of the LED, overheating or temperature fluctuations caused by direct damage to the LED or LED quality problems, especially for small size, such as 3mm round and oval LED.
To strictly control the wave front soldering temperature and time of the furnace, it is recommended to: preheat temperature of 100 ℃ ± 5 ℃, the maximum does not exceed 120 ℃, and the preheating temperature rise for a smooth, soldering temperature of 245 ℃ ± 5 ℃, welding time recommended no more than 3 seconds after the furnace vibration or shock should not LED, until the resumption of normal temperature. Wave soldering machine to regularly test the temperature parameter, which is determined by the characteristics of the LED, overheating or temperature fluctuations caused by direct damage to the LED or LED quality problems, especially for small size, such as 3mm round and oval LED.
7, Weld control
LED display LED is not lit in the event, they often have more than 50% probability for all types of Weld caused, such as LED pin Weld, IC pin Weld, Weld Pin Header mother and so on. These issues need to strictly improve the process to improve and strengthen the quality inspection to resolve. Factory vibration test may well be a good test.
LED display LED is not lit in the event, they often have more than 50% probability for all types of Weld caused, such as LED pin Weld, IC pin Weld, Weld Pin Header mother and so on. These issues need to strictly improve the process to improve and strengthen the quality inspection to resolve. Factory vibration test may well be a good test.
8, the thermal design
LED work may have a fever, high temperature will affect the speed and stability of the attenuation of the LED, so the PCB thermal design, thermal design of the ventilation box will affect the LED performance.
LED work may have a fever, high temperature will affect the speed and stability of the attenuation of the LED, so the PCB thermal design, thermal design of the ventilation box will affect the LED performance.
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