The difference between static and dynamic LED display-EEWORLD

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The so-called static display means that each display must occupy a separate I/O interface with a latching function for the stroke segment glyph code. In this way, the microcontroller only needs to send the glyph code to be displayed to the interface circuit, and then send a new glyph code when new data is to be displayed. This method has low CPU overhead and simple control program, but occupies more hardware resources.

Dynamic scanning display is the most widely used display mode in single chip microcomputer. Its interface circuit connects the same-named terminals of the 8 stroke segments da~dp of all displays together, and the common pole com of each display is independently controlled by the I/O line.

When the CPU sends the glyph code to the field output port, all displays receive the same glyph code, but which display is lit depends on the com end, which is controlled by the I/O, so it can decide when to display which bit. The so-called dynamic scanning refers to the use of a time-sharing method to control the com end of each display in turn so that each display is lit in turn. In the process of scanning in turn, the lighting time of each display is extremely short (about 1ms), but due to the visual persistence phenomenon of people and the afterglow effect of light-emitting diodes, although the displays are not actually lit at the same time, as long as the scanning speed is fast enough, the impression given is a set of stable display data without flickering.

Static display has much higher stability, but the cost is high. Dynamic scanning display has lower cost and lower stability. Which one is better and more practical depends on the occasion.

Reference address：The difference between static and dynamic LED display

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