In short, the black bars appear because the video's aspect ratio doesn't match your TV's. While companies like LG have released 21:9 TVs in the past, they have never really caught on.

Most modern TV screens have a 16:9 (or 1.78:1) aspect ratio. However, movies made for theaters are shot in even wider formats, like 2.35:1. Since that's wider than your TV screen, you see those ...

If you see Black and White squares on your computer screen, the problem may be with your display, GPU driver, or GPU. Use these fixes to resolve the issue.