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A pretty reasonable way to prototype fixed segment LCD displays. I'm kind of on the fence about the on/off backgrounding stuff.
Easter(?) egg: The 7SEGG-CHAN font appears in the preview image but is not documented on the page, other than a mathematical reference in the "Misc." section.
I don't understand why DSEG14 doesn't have some of the lower-case letters that DSEG7 does. Anyone know why?
I'm not convinced that, in the 14 segment font, we should just give up and accept that lower case "a" and "m" should just be the same as their upper case counterparts:

We can represent a "double storey" a like this:

   ___
      |
   ___|
  |   |
  |___| 

It's also unclear why we couldn't have a 14 seg lower case m like this:

   _ _
  | | |
  | | |

Maybe for each character, have a link to a documented rationale.

EDIT: Oh, look at the example font sheet featured in Wikipedia's Fourteen-segment-display page: it has these letters exactly as I say:

https://en.wikipedia.org/wiki/Fourteen-segment_display#/medi...

I used Omron's K3GN panel meters in a project at work and I had to draw the alphabet in the configuration drawing because it is so unintuitive. It's not a whole lot worse than the one shown in the article, but still... it's pretty rough. I think I prefer numbered parameters like you typically see on VFDs. It's a lot easier to just scroll to P148 or whatever, enter to view/modify, scroll the value, enter to set. Menu trees on seven-segment interfaces are a mistake.

Page six shows the alphabet: https://www.myomron.com/downloads/1.Manuals/Panel%20Indicato...