By By : : raman sanoriaraman sanoria

BLU-RAY DISCBLU-RAY DISC

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INDEXINDEX• IntroductionIntroduction• History & EvolutionHistory & Evolution• FeaturesFeatures• WorkingWorking• ImplementationImplementation• Future & Commercial MarketFuture & Commercial Market• ConclusionConclusion• ReferencesReferences

ISE, SCE

Blu_Ray Disks

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INTRODUCTIONINTRODUCTION

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Blu-ray disc (BD) is appropriately named after the blue laser Blu-ray disc (BD) is appropriately named after the blue laser used to write the dataused to write the data

A Blu-ray Disc (also known as BD or Blu-Ray) is an A Blu-ray Disc (also known as BD or Blu-Ray) is an optical optical disc storagedisc storage medium designed to supersede the standard medium designed to supersede the standard DVD format.DVD format.

The disc has the same physical dimensions as standard The disc has the same physical dimensions as standard DVDs and CDs DVDs and CDs

Takes up about five times more bandwidth and therefore Takes up about five times more bandwidth and therefore requires a disc with about five times more storage.requires a disc with about five times more storage.

Blu-ray is the next-generation digital video disc. It can Blu-ray is the next-generation digital video disc. It can record, store and play back high-definition video and digital record, store and play back high-definition video and digital audio, as well as computer data. The advantage to Blu-ray audio, as well as computer data. The advantage to Blu-ray is the sheer amount of information it can hold.is the sheer amount of information it can hold.

INTRODUCTION(contd)INTRODUCTION(contd)

A single-layer Blu-ray disc, which is roughly the A single-layer Blu-ray disc, which is roughly the same size as a DVD, can hold up to 25GB of data -- same size as a DVD, can hold up to 25GB of data -- that's more than two hours of high-definition video or that's more than two hours of high-definition video or about 13 hours of standard video.about 13 hours of standard video.

A double-layer Blu-ray disc can store up to 50 GB, A double-layer Blu-ray disc can store up to 50 GB, enough to hold about 4.5 hours of high-definition enough to hold about 4.5 hours of high-definition video or more than 20 hours of standard video. video or more than 20 hours of standard video.

Users will be able to connect to the Internet and Users will be able to connect to the Internet and instantly download subtitles and other interactive instantly download subtitles and other interactive movie features.movie features.

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HISTORYHISTORY

11stst GENERATION: GENERATION:Compact disc (CD): --- 650/700 MBCompact disc (CD): --- 650/700 MBIt is with us for over 20 years.It is with us for over 20 years.Wavelength of laser which reads data: 780 nmWavelength of laser which reads data: 780 nmColor of laser: Color of laser: RedRed 22ndnd GENERATION: GENERATION:Digital versatile disc (DVD): --- 4.7 GBDigital versatile disc (DVD): --- 4.7 GBIt offers high quality sound and video than CD.It offers high quality sound and video than CD.Wavelength of laser which reads data: 650 nmWavelength of laser which reads data: 650 nmColor of laser: Color of laser: RedRed

HISTORYHISTORY 33rdrd GENERATIONGENERATION::

Blu-ray disc (BD): --- 25/50 GBBlu-ray disc (BD): --- 25/50 GB-Next generation optical disc format.-Next generation optical disc format.

-Developed by blu-ray disc association (which -Developed by blu-ray disc association (which includes Apple, Hitachi, HP, LG, Panasonic, includes Apple, Hitachi, HP, LG, Panasonic, Pioneer, Philips, Samsung, Sharp, Sony)Pioneer, Philips, Samsung, Sharp, Sony)

-Wavelength of laser which reads data: -Wavelength of laser which reads data: 405 nm405 nm

-Color of laser: -Color of laser: Blue-violet Blue-violet which was which was developed bydeveloped by

SHUJI NAKAMURA SHUJI NAKAMURA

at NICHIA CORPORATIONat NICHIA CORPORATION

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FEATURESFEATURES

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•Record high-definition television (HDTV) without any quality loss

•Instantly skip to any spot on the disk

•Record one program while watching another on the disc

•Create playlists

•Edit or reorder programs recorded on the disc

•Automatically search for an empty space on the disc to avoid recording over a program

•Access the Web to download subtitles and other extra features

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WorkingWorking

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•Discs store digitally encoded video and audio information in pits -- spiral grooves that run from the center of the disc to its edges.

• A laser reads the other side of these pits -- the bumps -- to play the movie or program that is stored on the DVD.

•The more data that is contained on a disc, the smaller and more closely packed the pits must be.

• The smaller the pits , the more precise the reading laser must be.

•Unlike current DVDs, Blu-ray uses a blue laser . A blue laser has a shorter wavelength (405 nanometers) than a red laser (650 nanometers).

•The smaller beam focuses more precisely, enabling it to read information recorded in pits that are only 0.15 microns (µm) this is more than twice as small as the pits on a DVD.

•Blu-ray has reduced the track pitch from 0.74 microns to 0.32 microns. The smaller pits, smaller beam and shorter track pitch together enable a single-layer Blu-ray disc to hold more than 25 GB of information

THE TECHNOLOGY

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PitsPits : spiral grooves that run : spiral grooves that run from the centre of the disc to from the centre of the disc to its edgesits edges

BumpsBumps : other sides of these : other sides of these edges.edges.

Track pitchTrack pitch : it is the : it is the distance between the two distance between the two tracks (of pits) on the surface.tracks (of pits) on the surface.

----------------------------------------------------------Disc store digitally encoded data Disc store digitally encoded data

in PITS.in PITS.

FORMAT OF BD

It comes in four different formats:

BD-ROM (read only) : for reading recorded content.

BD-R (recordable) : for PC data storage.

BD-RW (rewritable) : for PC data storage.

BD-RE (rewritable) : for HDTV (high definition television) recording.

TYPES OF BD:TYPES OF BD: SINGLE LAYERSINGLE LAYER : :- Can hold data up to 25/27 GB that Can hold data up to 25/27 GB that

means 2 hrs of HD video or about 13 means 2 hrs of HD video or about 13 hrs of standard video.hrs of standard video.

DOUBLE LAYERDOUBLE LAYER : :- Can hold data up to 50 GB that Can hold data up to 50 GB that

means 4.5 hrs of HD video or more means 4.5 hrs of HD video or more than 20 hrs of standard video. than 20 hrs of standard video.

THE TECHNOLOGYTHE TECHNOLOGYPitsPits : spiral grooves : spiral grooves

that run from the that run from the centre of the disc to centre of the disc to its edgesits edges

BumpsBumps : other sides : other sides of these edges.of these edges.

Track pitchTrack pitch : it is the : it is the distance between the distance between the two tracks (of pits) on two tracks (of pits) on the surface.the surface.

----------------------------------------------------------------Disc store digitally Disc store digitally

encoded data in PITS.encoded data in PITS.----------------------------------------------------------------

THE TECHNOLOGYTHE TECHNOLOGY

So, in blu-ray disc:So, in blu-ray disc:

Pit sizePit size – 0.15 – 0.15 microns microns ( more than twice as ( more than twice as small as the pits on small as the pits on DVD )DVD )

Track-pitch isTrack-pitch is : 0.32 : 0.32 micronsmicrons

Laser neededLaser needed : : blue-blue-violet laser (405 nm)violet laser (405 nm)

Data transfer rateData transfer rate : 36 : 36 MbpsMbps

COMPARISON IN COMPARISON IN BUILDING BD AND DVDBUILDING BD AND DVD

BD Data is placed on top of a

1.1 mm thick polycarbonate layer

Doesn’t suffer from BIREFRINGENCE

Doesn’t suffer from DISC TILT

Hard coating is placed outside to protect from scratches or fingerprints

DVD Data is sandwiched b/w

two polycarbonate layers, each 0.6 mm thick

Suffer from BIREFRINGENCE

Suffer from DISC TILT

No such hard coating is placed

BLU RAY ‘S DURABILITY BLU RAY ‘S DURABILITY ADVANTAGEADVANTAGE

Various hard coating technologies make Bly ray Various hard coating technologies make Bly ray disc most durable and family -friendly”disc most durable and family -friendly”

Hard-coating technology provides resistance to:Hard-coating technology provides resistance to:

- Finger prints- Finger prints

- Marks- Marks

- Scratches- Scratches

- Dust- Dust Much more ROBUST than today’s Much more ROBUST than today’s

polycarbonate-based CD/DVD’s (and HD DVD’s)polycarbonate-based CD/DVD’s (and HD DVD’s)

FEATURES OF BDFEATURES OF BDWith BD we can: Record HDTV without any quality loss Instantly skip to any spot on disc Record one program while watching other on the

disc Create playlists Edit or reorder programs recorded on disc Automatically search for an empty space on the

disc to avoid recording over a program Access to web to download subtitles and other

extra features And many more…

BLY-RAY’S DENSITY BLY-RAY’S DENSITY ADVANTAGEADVANTAGE

Higher density enables better data seek times

Shorter to travel for same amount of data results in faster data seek

Better for random access of data

THE NAMETHE NAMEThe blu-ray name is a combination of

“blue”, for the color of the laser that is used and “ray” for optical ray.

The “e” in “blue” was purposefully left off, according to the manufacturers, because an everyday word cannot be a trademark.

On GAURDOn GAURD• Blu-ray discs are better armed than

current DVD’s. They come equipped with a secure encryption system– a unique ID that protects against video piracy and copyright infringement.

DO MORE WITH BLU…DO MORE WITH BLU…More capacity, Density and

PerformanceMore Industry Support/Consumer

Reach (BDA has 140+ members)More DurableMore Interactive User ExperienceMore Flexible Content Protection:

AAC, BD+ Renewability Technology and ROM Mark

Thank YouThank You