Seamless splicing LCD screen is composed of a number of pixels, each pixel forms image because of the ever-changing RGB color . If there is a problem with one pixel, color does not change, they formed a dead pixel. Typically, the dead pixel is divided into two different spots:colored and black. Then the colored pixel just stuck at this point, it can be repaired; black pixel spot means completely broken , it can not be repaired.

Dead pixel is a standard to measure the quality of seamless splicing LCD screen, state regulations,  the dead pixels of seamless LCD splicing screen panels is less than three to six that is qualified products, when we ready to buy LCD video wall unit,please choose the panel that is with less than three dead pixels or even no dead pixels. However, if the seamless splicing LCD screen passed the warranty period or improper handling caused dead pixels and supplier will not give you free maintenance.