STM32L4R5, STM32L4R7 or STM32L4R9 might be a better choice because they already contain the graphics controller and plenty of memory that you can use as a frame buffer.
The STM32L4R7 and STM32L4R9 even contain the Chrom-GRC (GFXMMU), with which you can save RAM on round displays that would otherwise be used for the corners that do not exist.
Regards
/Peter
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