While both 4K and Ultra High Definition are upcoming video formats that provide even higher quality visual experiences over the current HD content, many individuals are confusing 4K for UHD and UHD for 4K. This is not true, however, as the two formats are actually a bit different. While both provide higher quality video experiences over HD, there are specific specs that are not the same in either display format, which is why it is so important to know what each is and how it differs from one another.
For starters, 4K has a set resolution of 4096 by 2160 (or four times that of traditional HD). The aspect ratio of 4K is 1.9:1. On the other hand, UHD provides less video resolution at 3840 by 2160 with a ratio of 1.78:1. Due to this, 4K televisions are actually 256 pixels wider. Of course, 256 pixels isn’t all that much when you are looking at televisions that produce several thousand pixels per square inch, but it is is enough to set the two apart and for there to actually be a difference between the two.
While this small pixel difference might not seem all that much, it does cause a difference in viewing. This is because almost all television content produced is done in a 1.78:1 aspect ratio. This means, whenever the content is made available in 4K or UHD, if you watch the content on a true 4K television, there is going to be a black bar on the right and left of the screen, so you would not actually use the entire viewing area of the TV. This might be a bit different with movies, as movies often use different display formats, but ultimately, UHD is not true 4K, due to that drop in 256 pixels and the potential black bars on the side of the screen.