For a bunch of years now, Philips has made some of its TVs with a feature called Ambilight. This feature used colored LEDs on the back of the TV to backlight the wall or surface behind the TV to match the image seen on the screen. That means if your screen was green, the wall behind the TV glowed green as well.
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https://www.slashgear.com/dreamscreen-brings-diy-backlighting-to-any-tv-20423732/
