The matrix has seven columns, one for each segment on the display ... [Fran]’s circuit using a 555 and a 4017B decade counter to make a display count down to 0.

In today's video I want to show you 7 segment display with unique machenism that is our own invention. There are 7 circles ...

At its heart the device simply counts the oscillations of an input signal for one second, then latches the total to the 7-segment displays before zeroing the counter block and starting over.