I’d like to get away from phones with a backlight, at least for my next non-smartphone.
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Nowadays your best bet is e-ink, I think I’ve heard of a few examples, but they’re rather expensive for the specs you get
FYI, Passive Matrix doesn’t mean monochrome. Passive Matrix were color too. If you’re actually looking for a reflective monochrome LCD, you probably want STN aka Supertwist LCD.
I’m not aware of any STN smartphones. Others have already rightly posted eink is likely a better fit for what you want.