What exactly is the backlight on a smartphone display?

I usually piece together to fill in voids in my understanding of things. But, I'm not having any luck dealing with LCDs. All this about backlights, film, mirror...all I know is I can't seem to find anything anywhere to tell me the components of an LCD. I hate to show ignorance, but, could somebody please fill me in? I would really appreciate it. I have yet to get a display apart with the LCD intact. But maybe some day...

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Sure thing!

What model screens are you dealing with exactly? Samsung screens for instance are fairly different than iPhone screens

As for your question, the backlight is the component that provides the light source behind the LCD so that you can see it. Without it, the LCD would show an image, but you wouldn't be able to see it since it would be too dark.

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