the pure metal is obtain on the cathode ...it is positively charge........ and the impure metal is obtain on the anode.......its negatively charged........
A common anode 7-segment display is sometimes used in applications were the driving IC can not supply all of the required current but it can pull it to ground. This is common in microcontrollers. An...
For commonly anode display system, all anode of each LED are connected to voltage supply. While for commonly cathode display, all cathode of each LED are connected to ground.