One Laptop Per Child laptop also developed transflective displays for the laptop, which could switch between backlit color mode and sunlight-readable monochrome mode.
In practice, mono mode was just barely readable in bright sunlight, and the colour mode was a grainy mess for anything with fine detail due to the lack of true RGB pixels[1]. I knew someone who had one of those --- it was more of a cute toy than anything actually useful, and that was at the time when tiny "netbooks" were still common.