I was recently messing around with a very small eink display (and used it to display HN posts somewhat similar in concept to you). Out of curiosity, what display is that/where did you source it from?
It's a 13.3" 1600x1200 panel made by E Ink, from the Carta product line also used in Kindles et all, the ED133UT2. I bought it via Waveshare together with a little driver board featuring the ITE IT8951 controller: https://www.waveshare.com/product/displays/e-paper/epaper-1/...
The ED133UT2 is also available from E Ink directly and from other shops, but I haven't seen a significantly better price. There are also some other boards with the same controller around. An alternative to using the IT8951 is to hook the display up to an MCU with an adapter board for the flex cable directly and then drive the waveforms from the MCU, this is more complicated however and a little controller talking SPI is quite nice to have.
There's also a 10.3" with an even higher resolution that is very nice for various applications.
