LED display technology related knowledge

1, anti-static LED display assembly plant should have a good anti-static measure. Special anti-static, anti-static floor, antistatic soldering pen, prevent static radio pad, anti-static ring, anti-static clothing, humidity control, equipment grounding (especially cutting machine) is feet basic requirements, and to periodically with static specification.

2 and drive circuit design the LED display module on the drive circuit board drive IC arrangements will also affect the LED brightness. Due to the driver IC output current in PCB board too far, the transmission distance will make transmission path pressure drop is too large, affect the normal work of the voltage LED to lower its brightness. We often find the led panel module of brightness LED around than among low some, it is for this reason. So to ensure the consistency of the screen brightness, be about to design good drive circuit distribution.

3, design of the current value of the nominal current for 20 LED, generally recommend that its biggest mA use current for no more than 80% of the nominal value, especially for the point of the small screen space, because the radiation condition not beautiful, still should reduce the current value. According to experience, because red, green, blue LED the decay rate inconsistencies, targeted blue, green LED to reduce the current value, to keep screen after a long time the consistency of the white balance.

4, mix lamp one colour different brightness LED lamp to file, or mixed in accordance with the law of the design in discrete lamp plug drawing, to ensure that the whole screen lights each color brightness consistency. If problems arise, the process will be led display screen is not the same local luminance phenomenon, directly affecting the LED screen effect.

5, control the lamp of vertical degree for straight insert LED to a furnace, when enough technology guarantee in vertical PCB LED. Any deviation will influence has set up good brightness LED consistency, appear not consistent color piece brightness.

6, wave soldering temperature and time shall strictly control the temperature of the wave front welding and furnace time, suggest temperature 100 ℃ for: + 5 ℃, highest do not exceed 120 ℃, and the temperature rising demand, the welding temperature of 245 smooth ℃ + 5 ℃, the welding time suggested that not more than 3 seconds, avoid by all means vibration or impact after furnace LED, normal temperature until state. The temperature parameters to wave welder periodically, this is LED by the nature of the temperature fluctuations, overheating or directly LED or cause damage LED quality, especially for small size hidden danger such as 3 mm round and oval LED.

7, virtual welding control the LED display in appear in bright LED, often have more than 50% probability for all types of virtual welding of the cause, such as LED tube welding, and IC tube feet virtual feet virtual welding, row needles row mother virtual welding. These problems to strictly in improving the process to improve and strengthen the quality inspection to solve. Before they leave the factory vibration test also can yet be regarded as a kind of good method of inspection.

8, thermal design work LED to high temperature will fever, will affect the LED the decline of speed and stability, the PCB design, the heat of the ventilation cooling design will affect the performance of the LED.