This blog shows how to leverage the PIO found on RP2040 to drive a not-so-common type of display. Combined with the large SRAM found on the RP2040, this is quite usable.
(From: https://www.zephray.me/post/rpi_pico_driving_el/)
I thought this was a really good introduction to using the PIO blocks in the RP2040 to drive a peripheral, rather than bit-banging using the CPU.