What caused the caterpillar phenomenon on the LED screen?
1, the driver IC Weld or dead corner: A driver chip has 16 scan control pins for the LED, and a foot has a broken foot or false welding phenomenon, if it is a 16th sweep will have a list of 16 lights The bead is not normal and cannot be completely matched with the color that should be displayed. If a foot signal is short-circuited with other signals, this group of pixels will be constantly on.
2, Lamp internal short circuit: This situation is often seen in the surface mount lamp beads, each surface mount lamp inside the package of three colors of red, green and blue chips, the formation of a short circuit will lead to this column of pixel signals out of control, there highlights As well as the phenomenon of constant light, we also form caterpillars that we often say.
The simple trolley is a special equipment that must be used in the secondary lining of the tunnel construction process, and is used for the concrete lining construction of the inner wall of the tunnel loop. Lining trolleys are non-standard products that are indispensable for secondary lining during tunnel construction. They mainly include simple lining trolleys, fully hydraulic automatic lining trolleys and grid-frame lining trolleys. Full hydraulic lining trolley can be divided into side-top arch type, full circle needle beam type, bottom mold needle beam type, full circle travel type, etc. In the construction of hydraulic tunnels and bridges, lifting slipforms, jacking slipforms and turning forms are also commonly used.
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