Has anyone done any interesting work on transflective / reflective frontlit LCD panels? It seems like this is rife for progress; LCDs can achieve densities and response rates that are beyond the reach of any eink device, and only the lack of good contrast stands in the way.

The Daylight Computer[1] is the only thing I'm aware of.

[1]: https://daylightcomputer.com/

Fujitsu used to offer them --- their Stylistic ST-4110 was my favourite device for a very long while, used as for maps/navigation as well as an ebook reader in addition to being my main computer --- quite miss it and the simplicity of a single (stylus-equipped/daylight-viewable) device, as opposed to the ménagerie which I currently use (Samsung Galaxy Note 10+, Book 3 Pro 360, Kindle Scribe Coloursoft, Wacom One attached to MacBook)