Well that's kind of how a Transreflective LCD works. I had one on an old Nokia smartphone. It was a regular backlit color LCD, but when in bright sunlight which overpowered the backlight, a black-and-white only image was still visible in the light that fell on the phone's screen as the white areas reflected light.
Interesting article here about how the world has kinda "forgotten" about transreflective screens in the post-iPhone era as phones just kinda stopped using them. Also, backlights are brighter and more efficient now too.
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