You know, if LED never came about like it has, the lighting tech before it would still be mainstream and they would have put effort into improving those. The T8 would still be taking over T12 but at least more effort would be going into them, T12 would also still be around a little more as second best. Would also be less social media and phone zombies as the phone tech would have become what it is today and social media needs mobile users to thrive.

You know, if LED never came about like it has, the lighting tech before it would still be mainstream and they would have put effort into improving those. The T8 would still be taking over T12 but at least more effort would be going into them, T12 would also still be around a little more as second best. Would also be less social media and phone zombies as the phone tech would have become what it is today and social media needs mobile users to thrive.

Here the T5 would take over the T8 and T12. Before the LED tech they already started to replace T8 with T5. The only installations which excluded the T5 are coolers, car parks and in general all out door situations.

Phones/tablets would use CCFL backlights like everything else, and possibly dielectric barrier light sources would replace them later

Phones/tablets would use CCFL backlights like everything else, and possibly dielectric barrier light sources would replace them later

Some fancier phones now have OLED screens so those would probably still exist too. (my phone has one and it looks great).

Some fancier phones now have OLED screens so those would probably still exist too. (my phone has one and it looks great).

Isn't the blue pixels in the OLED the same as in a regular blue LED or

Isn't the blue pixels in the OLED the same as in a regular blue LED or

No. OLED are made by thin, usually amorphous, organic layers on a (glass) substrate,
the "regular" LED is an inorganic monocrystal (so a single regular structure), grown as epitaxy layer on either a silicon or saphire monocrystal substrate.
The monocrystal has way greater efficiency and long time stability (the Organic wears out rather fast compare to the monocrystal),
The OLED are way cheaper for a given area plus it is a matter of simple litography to form many different patches onto one common substrate (e.g. RGB matrix,...), so really usable for directly forming e.g. the screen panels. The OLED can easily be made as a stack of multiple individual LEDs (layers on top of each other), mainly used to boost the light output for the very low current density it allows, but also usable to combine different colors into one pixel, so making it of virtually any color desired (e.g. the bluish-green-gray for the small monochromatic displays,...)