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You can play 4K videos on a 1080p TV, but the video will be downscaled to fit the lower resolution of the TV. This means that the image won't be as sharp as it would be on a 4K TV, but it will still look better than a standard HD video.
When playing 4K content on a 1080p TV, it's important to set your 4K player to output at 1080p. This will ensure that the video is properly scaled to fit the lower resolution of the TV.
Keep in mind that while 4K content will still look better than standard HD on a 1080p TV, it won't look as good as it would on a 4K TV. The image won't be as sharp, and the colors won't be as vibrant.
If you want to get the most out of your 4K content, it's best to watch it on a 4K TV. However, if you don't have a 4K TV, a 1080p TV will still allow you to enjoy 4K content, even if it's not as sharp or vibrant as it would be on a 4K TV.