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Some unevenness is to be expected, as the LEDs can't cast a perfectly even light across the panel, but if the colour is greenish, I'd say those splotches are probably miscalibrated LEDs. Most, if not all of them are a shade of green, depending on the severity of the issue. Long story short, there is no fix, except if you know of a way to disassemble the device and replace the diodes. Hopefully, the fact it doesn't interfere with the text and that you only noticed it just now means that you can count yourself among the luckier ones.
There were folks on the forum who bought their devices new, noticed the issue, then returned them to Kobo, sometimes more than once, only to get replacements with even worse green spots! As always Kobo has major quality control issues, and it hasn't improved in the LE. I agree with your sentiment completely, such issues aren't really permissible in flagship devices. In fact, none of the bungles I've mentioned previously should occur even in low-tier devices, let alone Kobo's most expensive lineup. I guess that needs to be a factor when considering their future devices...
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