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I was thinking maybe 4:3 panels might be hard to come by today, but looking on amazon, they seem to be available, so ya. Might be neat if they had a built in CRT "filter", like running it through a raspberry pi with one of those CRT emulators or maybe FPGA to automatically give it more of a CRT feel.

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They don't need CRT filters. They need pamels able to display more than 16 bits of colour. (my UHD TV comes close, my old TN monitors are crap in this respect)

Filters like that would look cool, but would introduce at least 1 frame of latency, which isn't great, especially if the input is 30i or similar.

Do CRT filters actually need to buffer an entire frame, or is that just commonplace because it's the easy way to do things when you're implementing them in software? It seems like if FPGA based upscaling with CRT emulation is in scope, it shouldn't need to delay the signal by more than a few scanlines.

You don't need to add that much latency if the display is capable of some kind of GSYNC-like mechanism and a high data rate.

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