"Shining Bright: The Indiglo Button's Illuminating Power"

TL;DR
In 1992, Timex introduced the Indiglo technology, a push-button system that illuminated small displays with a soothing sea-green glow, revolutionizing portable electronics. Despite its stiff buttons, Indiglo's low power consumption and otherworldly glow made it a hit, leading to its licensing to other companies. While screens with LED lighting and self-lit OLED pixels are now common, Indiglo remains a standard feature on watches, showcasing its enduring impact on technology.
The Indiglo button let there be light The Verge
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