I got intoxicated one night and all I could think about was making this so I sat down for about 6 hours making a cycles mask that could be used as a digital clock display. The node just needs coordinates (you'll see what I mean if you look at the material) and a time, and it outputs a binary map displaying the time. You can use this output with pretty much any shader. I haven't tried it yet but I can imagine it's super easy to animate. There are no images used to produced this display, it's all procedural and very scalable.
I made every node here by myself with no outside inspiration. I didn't even know this axisted. I looked at the thing you sent me. It seems we had similar goals in mind. One of the biggest differences I see is that this person had a different node group for every number value. Mine just takes a value 0-1 and determines whether or not a section of a number will display.
If this prior example is borrowed from, you may want to give some credit here: https://blenderartists.org/t/procedural-7-segment-digits/1102053/4
Node group for a clock at the bottom of the post, and was made in back in April of this year. BTW, I'm ok with CC-BY-SA, but that BY thing usually means crediting the sauce.