steveohsredstone.com
First Redstoneless 7 Segment Display | In Color! | Steve_OH's Redstone
Pretty confident this has not been done, if I am wrong let me know. The magic behind this is delved from a concept trazlander identified as the ability to spawn and destroy blocks. This requires precise timing, but I was able to, after a number of hours, get it to work as it currently does. Due to the nature of the filter, you can't make it all appear at once, else it will break the blocks and there will be a gap in the display