GC9A01

The GC9A01 is a 240x240 round IPS TFT display driven over SPI. It's write-only - no MISO needed. The round shape makes it a natural fit for instrument clusters, watch faces, and character displays.

Use the Arduino_GFX_Library by Moon On Our Nation. TFT_eSPI works but requires config file edits. Adafruit_GC9A01A is slower and less reliable on this display.

Some AliExpress AU depot stock has a known bad batch issue - garbled pixels and green lines that look like a software problem but aren't. If after many hours of exhausting debugging nothing works 😩 try a different supplier.