Super Retina XDR: display 6.7‑inch (diagonal) all‑screen OLED display 2778‑by‑1284-pixel resolution at 458 ppi The iPhone 12 Pro Max display has rounded corners that follow a beautiful curved design, and these corners are within a standard rectangle. When measured as a standard rectangular shape, the screen is 6.68 inches diagonally (actual viewable area is less).