Advantages and disadvantages of SMD ：

Introduced in 2001, SMD packaging technology is highly mature for 1mm and above products, whether for indoor or outdoor applications, with almost two decades of development. SMD has a well-established supply chain with complete equipment and experienced production lines for mass production. SMD diodes are highly reliable and easy to repair, and the cost is relatively low compared to other packaging methods. 

SMD surfaces are not sealed like COB’s, therefore the level of protection against water, dust, and external force (during transportation and installation) is not as high as expected. This is why fine-pitch LED display installation becomes a white-glove job, requiring delicacy and experience. Some SMD LED displays use a module mask (shader). In high-temperature environments, mask bulging is likely to occur, which will affect viewing. In most cases, the mask surface may turn white or yellow after a period of use, which may also degrade the user experience. Pixel pitch at or below P0.7mm presents physical limitations. Due to the size of SMD packaging and welding wiring layout space on PCB boards, it is challenging for SMD displays to advance to finer pitches.