In that range, nothing noticeable in the picture.
Once you go too far low (I don't know the exact value for a 6100, but it's on the order of at least 2-3kV), you'll get blooming. But the image typically will look 'ok' over a fairly wide range around the rated setting.
Note that doesn't speak to whatever secondary effects (premature failure, heat, stress, etc) might happen over the long term from running excessively high or low. It's an analog circuit with active components, so it was designed to run at a specific voltage (with some tolerance, usually +/-5% is a reasonable minimum safe assumption for any electronics, if you have no other info).
Low-power digital stuff I don't worry as much about (though anything can technically start a fire). But with higher power things like monitors, I don't take chances, and I stick to the ratings. Better safe than sorry.
Everything is statistical, so there's always a matter of 'how much you can get away with', but with that there's also increased risk, so there are always tradeoffs. And unless you fully understand what those tradeoffs are, it's best not to take chances.