Component knowledge
4 Digit 7-Segment Display
4 Digit 7-segment display integrates four 7-segment display, so it can display more numbers. According to
the difference about common cathode and anode. its internal structure and pins diagram is shown below:
The internal circuit is shown below, and all 8 LED cathode pins of each 7-segment display are connected
together.
Display method of 4 Digit 7-segment display is similar to 1 Digit 7-segment display. The difference between
them is that 4-Digit display in turn, one by one, not together. First send high level to common end of the first
tube, and send low level to the rest of the three common end, and then send content to 8 LED cathode pins
of the first tube. At this time, the first 7-segment display will display content and the rest three one in closed
state.
Similarly, the second, third, fourth 7-segment display the content in turn, namely, scan display. Although the
four numbers are displayed in turn separately, but this process is very fast, and due to the optical afterglow
effect and people in vision persistence effect, we can see all 4 numbers at the same time. On the contrary, if
each figure is displayed for a long time, you can see that the numbers are displayed separately.
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