![]() The light-emitting element normally takes the form of a diode so electricity will only flow in one direction, keeping the individual "row" and "column" lines of the matrix electrically isolated from each other. Instead, sub-units of the display (typically, rows or columns for a dot matrix display or individual characters for a character orientated display, occasionally individual display elements) are multiplexed, that is, driven one at a time, but the electronics and the persistence of vision combine to make the viewer believe the entire display is continuously active.In senven segment displays the various segments of each character are connected in a two-dimensional matrix and will only illuminate if both the "row" and "column" lines of the matrix are at the correct electrical potential. Also from the link, it looks like CA on the 7-segment needs to also be pulled up to Vcc through a resistor. Looks like your problem might be that LT,RBI,BI/RBO on the 7447N Chip are just floating. In the technique of multiplexing the entire display is not driven at one time. 20 20 Comments Best Add a Comment the3nforcer 10 yr. ![]()
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