Unsolved Backlight Inverter/board

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taking the A+ course, and in this video at ~19 minutes, Wes explains that monitors use AC, and so laptop monitors need an inverter. He then explains that desktop, in his words "full-size" monitors use a backlight inverter too, and goes on to give an anecdote of a diagnosis and I guess forgets to explain why desktop monitors have inverters. A ton of can't-stand-'ems in this video so I don't blame him.

Google tells me similar things about diagnosing/replacing the inverter board in monitors, and I've found sources saying that monitors need higher voltage than a PSU supplies.

Anyway, the question you've presumed by now: why do desktop monitors need an inverter unit if they're getting residential ~110-220 volt AC? I can't imagine they need more power than that - is it some kind of a stop-gap for regional variations in residential voltage? Am I missing something obvious? Should I go to bed?

thanks

Edit: I probably posted this in the wrong place, don't shoot me ibeg

@Zachary-Dace,
I moved your post to CompTIA section of our forums.

Hey @Zachary-Dace great question sir, as to if desktop monitors have inverters here is example:

Consider the Apple iMac A1312 27" 2010 - https://www.pcliquidations.com/p82899-apple-imac-a1312-27

This desktop-based computer uses a backlight inverter which you can see here:
https://www.amazon.com/Backlight-Board-Inverter-A1312-V267-604/dp/B0169YV90K

They are primarily used in laptops for instance CCFL inverters in LCD displays

@wes-bryan unfortunately I was wondering why desktop monitors have inverters, if they're plugged into residential AC and they require AC...

Sorry I know I'm obsessing over a minutiae, but I can't get the question out of my head, and unfortunately I can't find the answer with my weak google-fu.

@Zachary-Dace you do not have to say sorry, these are good questions. I will follow up with some additional resources for you sir!

Thanks man! Usually when I talk to you through the screen you can't hear me, even if I am another red-green colorblind Zach!

A friend had a guess that sounds like it could be accurate, that maybe portions of lcd screens work with low-volt DC, and it regulates/converts voltage/current-type for varying needs in a unit, a CCFL LCD, higher volt requirement comes to mind. But we're just guessing.

Of course with the iMac link you provided, it's quickly apparent that it would need an inverter, since the whole unit runs off of one power source, but as far as I can tell it's not just all-in-one monitors.