So I have a couple of devices where the VFD is looking less-than-fresh and it doesn't look possible to easily find replacement parts, particularly as it appears they're custom for the job. I know it's supposedly possible to over-volt them to bring a bit of life back to them but that seems like it could be error prone and with other similar kludgy solutions for other things (refreshing NICADs for example), it often seems short lived.
So with the ready availability of cheap LCD displays on the market, I'm wondering about the feasibility of simply (or should I write "simply"?) dropping in something that intercepts the signals (probably some microprocessor) and generate the output on an LCD. Ideally, I suppose, it would be preferable to intercept the input to the driver chip (if such exists) or failing that, intercept the signals to the pins of the VFD itself.
I have a rough idea of how VFDs function but not familiar with the details of the multiplexing, etc so I thought I'd run the idea out here first and see if there's any show-stoppers I'm missing. If it could be made generic enough, it could be a way to bring a lot of old equipment back to life. Potentially, it could even add functionality.