Of the boards examined, six of them have OLED displays, but one has an E-paper display. To summarize results, [Andreas] summarized his findings on these seven along with others in an online ...

He recently completed a project with an ESP32 Pico D4 and an OLED display that fits exactly on an AA battery holder, which he populated with a rechargeable 14550.

Ashtf first showed off this hybrid typing method a few months ago using a full-sized keyboard and a set of OLED and E Ink screens.

As Hackaday revealed, this one comes with an E Ink display, a secondary OLED panel, and a keypad made of soft silicon that is encased within a see-through case.