If you don't send the entire buffer then a monitor should have at least 6220800 bytes of RAM dedicated to the frame buffer (1920x1080 resolution), do auto refre

If you don't send the entire buffer then a monitor should have at least 6220800 bytes of RAM dedicated to the frame buffer (1920x1080 resolution), do auto refresh (standard 60Hz) on the panel, and accept commands to overwrite said memory with new data, partially or completely. That solution is far from what we have now, and much more like a serial LCD controller.