When did Apple start using LED backlights for display panels?

I am a relative newcomer to Apple world.
As an electronics professional, I am interested in display technology and progress.
Apple displays have been impressive for some years,particularly the MacBooks etc.
Does anyone know the historical points when LED's were replacing fluoro's?
Thanks folks.

Probably your best resource is the MacTracker dataase as it identifies the display technologies in different models. The LED was introduced at different times with different models. and MacTracker is subdivied by models--easy. Here's its entry for an older Intel iMac showing the TFT instead of LED display:
(click image to enlarge if needed)
Mactracker is freeware or donationware depending on your mindset and is here:
http://www.mactracker.ca/
For my research needs, it is much more convenient to have it as a free-standing app running under the Apple Discussions window than to use similar sites that require a lot of page navigation.

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When did Apple start using LED backlights for display panels?

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