Check out Inkplate [1], which is an ESP32 based 6.5" E Ink display, refurbed from a kindle. It has everything to build a wall mounted screen, that can update itself over Wifi or Bluetooth with battery for weeks.

They Croatian company [2] is already working on a 10" model.

[1]https://www.crowdsupply.com/search?q=inkplate

[2]https://inkplate.io