1. Sunlight is really, really, really bright.
2. Reflective display tech *sucks* for a phone’s use case. They’re low res, slow refresh (scrolling a page is agony), the colors are off, etc.
For phones, High res and High-refresh are mandatory. We’re talking 1080p and 60hz minimum, ideally 120hz+)
Monochrome e-ink phones are… Niche. You need to *really* want an e-ink screen, and put up with significant trade-offs
Color e-ink is only just getting ready for mainstream for static e-readers (Should be nice for comics), and a few years behind monochrome performance for mobile device usage.
That said, BlackBerry (and many other devices) used to use “transflective” displays. They are LCD’s with back lights… But which can also reflect bright light, so they remain clear in direct sunlight. Not sure about refresh/resolution limitations…. But the whole world left them behind.
> and then we never heard about this invention again.
Maybe you live under a rock, but Kindle and other brands of e-ink-based readers are available and very widely used. Those are however obviously not phones, but for reading. They have a slow refresh rate and are usually a single color, rarely up to maybe 8 of them. People want to watch videos on their screens, not just read newspapers, so they don’t usually buy phones based on e-ink, but a select few options are available.
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