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The Blu-ray Disc continues to evolve to allow more information on each generation maintaining the same physical format. So the first Blu-ray disc was created and these are the steps you are taking to ensure their relevance in Ultra High Definition.
All technology was created to abolish limitations of the adopted and established. In this case was the DVD, the density of information was limited by the wavelength of the employed laser diodes.
had to achieve using diodes with a lower wavelength, and the blue laser operating at 405nm is able to develop production.
This is when Sony decides to collaborate on two parallel projects. The first Philips and the second with Pioneer in the use of the new diodes. The latter became the Blu-ray Disc we all know.
The first prototype of the DVR Blue was launched in October 2000 by Sony, officially being presented as Blu-ray Disc in February 2002 along Blu-ray to the foundation by the nine initial members.
In 2003 came the first recording with this technology, it cost $ 4,000 and was only available in Japan. A toy for the rich that never would launch movies.
And is that Hollywood was not very happy with the null safety DVD, constantly copied and distributed illegally. Until we have a safe system of DRM, not release movies in that format.
They were joined executives from content producers to the association as Fox or Warner Bros 20th and, after completing the system specification included copy, was officially launched in 2006 .
Along with the first readers the first films were presented at this high-resolution format. As will happen with the first titles UHD Blu-ray, the selection was not very good.
Also used the same set of video compression (MPEG-2) that the DVD, even more efficient codecs were introduced as VC-1 and Blu-ray dual layer below.
The DVD used to read a red laser light with a wavelength of 650nm, while the Blu-ray Disc uses a “blue” light of 405nm. Blue quotation marks because the light is actually a shade of violet.
The lower light wave can affect a smaller area, which allows you to read information recorded in the grooves under half the size of those used in a DVD. The track pitch is shorter, so the information is more condensed and allows in a Blu-ray Disc, stored five times more information.
The laser diode lasers are gallium nitride light emitting 405nm without using nonlinear optical devices.
The minimum point at which the laser can impinge is limited by diffraction, and depends on the wavelength of light and opening dela lens that focuses. Thanks to a shorter wavelength, the opening can be increased, and making the layer on which is written a finer, preventing unwanted optical effects, companies can cause the laser to focus on what a smaller space, therefore, it allows more information in the same space.
UHD Blu-ray Disc
Interestingly, new format of Blu-ray Disc video UHD designed to house does not need a new technology.
These are the same discs, with a more refined technique and Above all, vast improvements in video codec used.
The Blu-ray 66GB (dual layer) and 100GB (triple layer) will suffice to store movies or sports events to resolution UHD and 60fps . Yes, the maximum bitrate, as it is variable, is fixed by such capabilities:
- Discs 66GB will have a bit rate of 108Mbps
- The disks 100GB will. a bitrate of 128Mbps.
This will allow improvements in picture quality beyond resolution . Blu-ray HD Ultra will use a color space much bigger with Rec. 2020, allowing more saturated colors can be reproduced.
The Ultra HD Blu-ray will support 10bit per color channel coding to be used Rec. 2020 spent 16.7 million shown to 1.070 million colors.
November 12, 2015
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