Thanks! I really wanted to give some of the developers behind these projects a chance to talk about their work, since so much of the experience depends on what they’re doing.

The Duo actually has two different panels: a 5.5-inch 16:9 AMOLED on top (1920×1080) and a 4.5-inch 4:3 AMOLED below (1280×960). Azahar handles the two 3DS screens independently, so the upper 400×240 image is scaled to fit the top display while preserving its original 5:3 aspect ratio, leaving small black bars on either side. The lower 320×240 image is already 4:3, so it fills the bottom panel perfectly. You can upscale the 3D rendering considerably without stretching either screen, and in practice it all works rather nicely :)