Retro games display black bars on modern widescreen TVs

Retro video games often display black bars on the sides when played on modern televisions due to differences in aspect ratios. Older games were designed for cathode-ray tube (CRT) televisions, which utilized a nearly square 4:3 aspect ratio. In contrast, modern displays typically use a 16:9 widescreen format.

To maintain the original proportions of the game, modern TVs use a technique called ‘pillarboxing,’ which fills the unused side space with black bars. While some televisions allow users to stretch the image to fill the entire 16:9 screen, this results in horizontal distortion where characters and environments appear unnaturally wide. Alternatively, using a zoom function can fill the screen but results in parts of the image being cropped.

Technical complexities also arise from how older consoles like the NES, SNES, and Mega Drive produced video signals. These systems often relied on analog timing, such as the 240p signal, which was optimized for CRT behavior. Because modern digital screens use perfectly square pixels, the internal resolutions of retro games may not perfectly align with a standard 4:3 display, a factor often addressed by dedicated emulator scalers.