People have had this dream for probably close to 20 years (since Kindle v1).

And yet it still seems out of reach beyond going with a full hdmi eink display.

The closest I have found is the M5Stack 4.7” eink display with built in esp32 and lipo battery.

A single company controls the patents for eInk displays, so that’s why it hasn’t happened. China could probably pump them out for cheap.