Yes, you can play 4K Ultra HD discs on a 1080p TV. When you do this, the player will downconvert the 3840 x 2160 resolution video on the disc to a 1080p format that your TV can display. Additionally, the player will bypass any high dynamic range (HDR) metadata since regular HDTVs are not capable of processing that information. While watching 4K Ultra HD on a 1080p TV will not provide the full potential of the 4K resolution, it can still offer tangible improvements in clarity, detail, and colors thanks to the high resolution and expanded color capabilities of the 4K disc. However, you will not be able to see the disc's full 4K resolution on screen unless you have a 4K TV. Most 4K Blu-ray players are designed to be backwards compatible with viewing on any HDTV or 1080p display, and smart TVs and 4K Blu-ray players often have various user settings that you can toggle to choose the most suitable configuration for a specific video or movie.