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.