Many popular video formats, including broadcast television and Blu-ray discs, are limited by standards built around the physical boundaries presented by older technologies. Whether a panel can reach 200 cd/m^2 (relatively dim) or 2,000 cd/m^2 (incredibly bright), and whether its black levels are 0.1cd/m^2 (washed-out, nearly gray) or 0.005cd/m^2 (incredibly dark), it can ultimately only show so much information based on the signal it's receiving. However, just expanding the range between bright and dark is insufficient to improve a picture's detail. Essentially, dynamic range is display contrast, and HDR represents broadening that contrast.
Dynamic range describes the extremes in that difference, and how much detail can be shown in between. TV contrast is the difference between how dark and bright it can get. That's why we're here to explain them to you. It's impressive to see on TVs that can handle it, but it's also a fairly confusing technical feature with several variations with differences that aren't very well-established. It can push video content past the (now non-existent) limitations to which broadcast and other media standards have adhered to for decades. High dynamic range (HDR) video is one of the biggest 4K TV feature bullet points.
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