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Blu-ray Disc


									Blu-ray Disc
 By Asit Kumar Mohanty
  Regn no : 0301227253
► Blu-ray, also known as Blu-ray Disc (BD) is the
  name of a next-generation optical disc format. The
  format was developed to enable recording,
  rewriting and playback of high-definition video
  (HD), as well as storing large amounts of data.
► The format offers more than five times the storage
  capacity of traditional DVDs and can hold up to
  25GB on a single-layer disc and 50GB on a dual-
  layer disc.
► Blu-ray disc (BD)  is appropriately named
  after the blue laser used to write the data
► The first blue laser was developed in 1996
  by Shuji Nakamura (Nichia Corporation)
► In 2002, an alliance was formed, called the
  Blu-ray Disc Association, including the
  likes of Sony, Samsung, Sharp, Hewlett-
  Packard, and Royal Phillips
► The “e” is intentionally left out of the name
  due to trademark restrictions
              Blu-ray Disc Association
►   Apple Computer, Inc.
►   Dell Inc.
►   Hewlett Packard Company
►   Hitachi, Ltd.
►   LG Electronics Inc.
►   Matsushita Electric Industrial Co., Ltd.
►   Mitsubishi Electric Corporation
►   Pioneer Corporation
►   Royal Philips Electronics
►   Samsung Electronics Co., Ltd.
►   Sharp Corporation
►   Sony Corporation
►   TDK Corporation
►   Thomson Multimedia
►   Twentieth Century Fox
►   Walt Disney Pictures
►   Warner Bros. Entertainment
       Variations and Sizes
►A  single-layer Blu-ray disc (BD) has enough
  storage capacity (25GB) for approximately two
  hours of high-definition video with audio.
► A dual-layer (50GB) BD can hold enough data for
  approximately four hours of HD video.
► TDK recently announced that they have created a
  working Blu-ray disc capable of holding 200GB of
  data (six 33GB data layers).
            Laser and optics
► Blu-ray systems use a blue-violet laser
 operating at a wavelength of 405 nm,
 similar to the one used for HD DVD, to read
 and write data. Conventional DVDs and CDs
 use red and infrared lasers at 650 nm and
 780 nm respectively.
                   Why Blue Lasers?
► High-definition TV provides six times more
  picture information than standard-definition
    More bits per second required
    More gigabytes per disc required

   1920 x 1080 x 30 = 62 million pixels/second
     720 x 480 x 30 = 10 million pixels/second
           Disc Characteristics
►   Single layer: 25 GB
    Dual layer: 50 GB
►   Diameter: 120 mm
►   Thickness: 1.2 mm
►   Center hole
    diameter: 15 mm
►   Uses GaN laser of
    wavelength 400 nm
►   The smaller laser,
    compared to the
    DVD and CD, keeps
    the process more      Courtesy Blu-ray Disc Founders “Blu-ray Disc Format White Paper”
    efficient (~5 mW)
     Hard-coating technology
►   In January 2004 was
    introduced a clear polymer
    coating that gives Blu-ray
    Discs unprecedented
    scratch resistance. The
    coating was developed by
    TDK Corporation and is
    called "Durabis". It allows
    BDs to be cleaned safely
    with only a tissue.
                         Blu-ray and DVD
Parameters               Blu-ray       DVD
Storage capacity         25GB          4.7GB (single-layer)
                         (single-      8.5GB (dual-layer)
                         50GB (dual-
Laser wavelength         405nm (blue   650nm (red laser)
Numerical aperture       0.85          0.60
Disc diameter            120mm         120mm
    Disc thickness       1.2mm         1.2mm
Protection layer         0.1mm         0.6mm
    Hard coating         Yes           No
Track pitch              0.32µm        0.74µm
Data transfer rate       36.0Mbps      11.08Mbps (1x)
    (data)               (1x)
    Data transfer rate   54.0Mbps      10.08Mbps (<1x)
    (video/audio)        (1.5x)
Video resolution (max)   1920×1080     720×480/720×576 (480i/576i)
    Video bit rate       (1080p)       9.8Mbps
    (max)                40.0Mbps
Video codecs             MPEG-2        MPEG-2
                         MPEG-4          -
                         AVC             -
                         SMPTE VC-
Blu-ray vs DVD capacity
CD vs DVD vs Blu-ray writing
►   This issue has introduced a competitor, the HD-DVD, that based
    its technology around being compatible with the DVD
►   Recently the BDA has developed recorders that are BD/DVD/CD
►   JVC has advanced the BD by developing a BD/DVD combo disc
    that stores both DVD and BD data. It is composed of two DVD
    layers and a third BD layer storing 33.5 GB total
    Blu-ray Advantages
► Record high-definition television
  (HDTV) without any quality loss
► Instantly skip to any spot on the disc
► Record one program while watching
  another on the disc
► Edit or reorder programs recorded on
  the disc
► Automatically search for an empty
  space on the disc
► Expect the  BD to become more prevalent
  once the HDTV market establishes its
► Audio and video will reach higher qualities
  with larger storage space
► Look for BD with more than two layers as
  the technology is further refined
► BothDVD and BD would most likely co-exist
 for quiet some time until HDTVs become
 more widespread.
Thank you

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