ultra HD Blu-ray
Ultra HD Blu-Ray is a Blu-ray Disc( BD) specified by the Blu-Ray Disc Association ( BDA) for movies in UHD (Ultra High Definition) format in 4K standard with 3,840 x 2,160 pixels and a refresh rate of 60 Hz. The audio and video representations are defined by High Definition Movie( HDMV). The Ultra HD Blu-Ray stores the data in two or three layers. It comes with storage capacities of 50 GB, 66 GB and 100 GB.
As for the different storage capacities, the 50 GB version uses two layers of 25 GB each, the 66 GB version also works with two layers but with a higher storage density, and the 100 GB version, on the other hand, has three layers with a higher storage density.
For video compression, the highly efficient video codecHEVC, H.265 is used. This codec can be used to display HDTV with a resolution of 1,920 x 1,080 pixels and UHDTV with 3,840 x 2,160 pixels and a refresh rate of 24 Hz, 30 Hz, 50 Hz or 60 Hz. Alternatively, the H.264 codec can also be used. However, only HDTV can be displayed with it.
Playing Ultra HD Blu-Ray cannot be done with the known BD players, a new player is needed for this, which is, however, downward compatible with the conventional Blu-Ray discs. The interface to the high-resolution displays is the HDMI interface in version 2.0, which also supports the copy protection High-Bandwidth Digital Content Protection( HDCP). To improve the contrast ratio, Ultra HD Blu-Ray works with High Dynamic Range( HDR) with a brightness resolution of 10 bits and corresponds to HDR10. 3D sound is supported with DTS:X (Digital Theatre Sound), Auro 3D and Dolby Atmos audio formats.