4K refers to 4K resolution, meaning the image is 3840 horizontal pixels.  That’s 4 times the number of pixels than HDTV.  In other words, this relatively new technology is a very high resolution providing much greater contrast and detail in the picture. The bigger your display, the more important this detail becomes because the picture will be a lot clearer and sharper. This ultra-high definition means that it’s more interesting to look at which means it captivates the viewers more which means, yes, greater impact.