My friends must know something about this. Those who know nothing, find out what this is. When taking a job like this, let's not think that the work will be done somehow and think about how this will actually happen, shall we? Friends who have a little knowledge about this know what seven segment display is. So, by turning on and off the seven LEDs in this display, we make numbers and letters. You can see that we need eight outputs to drive this one display. So, in a watch, four such units should be driven as a minimum. That's where multiplexing is important for us. Otherwise, we need 32 outputs for 4 displays. So a small IC does not have those facilities in a microcontroller. This strategy is the most successful. Here only 11 outputs are required for all four.
In this, the output connected to the common pin goes high and low (on/off) very fast. Due to this process happening at a speed that is not noticeable to the eye, the off time cannot be seen and according to the diagram, it is possible to show two digits at a time from the same 7 outputs of the two displays.
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