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I think it was something like reflective LCD and not epaper, that's what allowed it to have a fast refresh rate but still use very little power. I'm still surprised I haven't seen much tech using that type of screen.
I've made many posts on many platforms wondering the same thing, especially for something like a watch that you want to be always on. Sure, amoled exists, but isn't e-paper much better for that use case?
I'm even daily driving an e-paper android tablet for notes and reading and it's awesome. A charge lasts me over a week with heavy use.
Also, not entirely sure of the exact tech for the original pebble, was it TFT? The RePebble site linked by OP talks about e-paper but maybe that's just what they want going forward
It was a Sharp "Memory LCD".
https://sharpdevices.com/memory-lcd/
Basically "visible memory storage".
You treat it as addressable memory and write into it, and it will hold that state using about 15 microwatts to do so.
You can still buy the display modules , there's a few boards that let you easily drive them with arduinos and etc.