Blu ray ppt

8/3/2019 Blu ray ppt

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BLU-RAY DISKBy: M.Viswanath

08N71A0432


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HISTORYHISTORY

1stGENERATION:

Compact disc (CD): --- 650/700MB

It is with us forover20 years.

Wavelengthoflaserwhichreadsdata: 780nm

Coloroflaser: Red


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2

nd

GENERATION:Digitalversatiledisc (DVD): --- 4.7GB

Itoffers high quality sound andvideothanCD.

Wavelengthoflaserwhichreadsdata: 650 nm

Coloroflaser: Red


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3rd GENERATION:

Blu-ray disc (BD): --- 25/50 GB-Next generationopticaldiscformat.

-Developed by blu-ray discassociation (which includes

Apple,Hitachi,HP, LG,Panasonic,Pioneer,Philips,Samsung, Sharp, Sony)


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-Wavelengthoflaserwhichreads data:

405 nm

-Coloroflaser: Blue-violetwhich was

developed bySHUJI NAKAMURA

at NICHIA CORPORATION


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FORMAT OF BD

It comes in four different formats:

BD-ROM(read only) : for reading recordedcontent.

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

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

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


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TYPES OF BD:TYPES OF BD:SINGLE LAYER :

- Can hold data up to 25/27 GB that

means 2 hrs of HD video or about13 hrs of standard video.

DOUBLE LAYER:

- Can hold data up to 50 GB thatmeans 4.5 hrs of HD video or morethan 20 hrs of standard video.


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THE TECHNOLOGYTHE TECHNOLOGYPits: spiral grooves that run

from the centre of the disc toits edges

Bumps: other sides of theseedges.Trackpitch: it is the distance

between the two tracks (of

pits) on the surface.--------------------------------Disc store digitally encoded data

in PITS.


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So, in blu-ray disc:

Pit size 0.15 microns ( more than

twice as small as the pits on

DVD )Track-pitch is: 0.32 microns

Laserneeded: blue-violet laser (405

nm)Data transferrate : 36 Mbps


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Courtesy Blu-ray Disc Founders Blu-ray Disc Format White Paper


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Numerical Aperture

measures the ability of a lens

to gather and focus light. As

the numerical aperture

increases, the focusing

power increases and the

beam size decreases


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Phase change implies

that the disc section is

either an amorphous or

crystalline state. Thereflectivity changes

accordingly thus

representing a binary bit


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COMP ARISON IN BUILDINGCOMP ARISON IN BUILDINGBD AND DVDBD AND DVD

BD

Data is placed on topof a 1.1 mm thick

polycarbonate layer

Doesnt suffer fromBIREFRINGENCE

Doesnt suffer fromDISC TILT

Hard coating is placedoutside to protectfrom scratches orfingerprints

DVD

Data is sandwichedb/w two

polycarbonate layers,each 0.6 mm thick

Suffer fromBIREFRINGENCE

Suffer from DISCTILT

No such hard coatingis laced


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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 compatible

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


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BLU RAY S DURABILITY BLU RAY S DURABILITY

ADVANTAGEADVANTAGE

Various hard coating technologies make Bly rayVarious hard coating technologies make Bly ray

disc most durable and familydisc most durable and family --friendlyfriendly

HardHard--coating technology provides resistance to:coating technology provides resistance to:

-- Finger printsFinger prints

-- MarksMarks

-- ScratchesScratches

-- DustDust

Much more ROBUST than todaysMuch more ROBUST than todays

polycarbonatepolycarbonate--based CD/DVDs (and HD DVDs)based CD/DVDs (and HD DVDs)


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FEATURES OFBDFEATURES OFBDWith BD we can:Record HDTV without any quality

lossInstantly skip to any spot ondisc

Record one program while

watching other on the discCreate playlists


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Edit or reorder programs recordedon discAutomatically search for an empty

space on the disc to avoidrecording over a program

Access to web to downloadsubtitles and other extra features

And many more


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BLUBLU--RAYS DENSITYRAYS DENSITY

ADVANTAGEADVANTAGEHigher density enables better

data seek timesShorter to travel for same

amount of data results in faster

data seek

Better for random access ofdata


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THE NAMETHE NAME The blu-ray name is a

combination of blue, for thecolor of the laser that is usedand ray for optical ray.

The e in blue was

purposefully left off, according tothe manufacturers, because aneveryday word cannot be a

trademark.


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On GAURDOn GAURDBlu-ray discs are betterarmed than current DVDs.

They come equipped with asecure encryption system aunique ID that protects

against video piracy andcopyright infringement.


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Error rates increased in reading

and writing after the original BD

suffered scratches and fingerprints For protection, the prototype BD

was enclosed in a case

The case increased the size of thedisc drive


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DO MORE WITHBLUDO MORE WITHBLU

More capacity, Density andPerformance

More Industry Support/ConsumerReach (BDA has 140+ members)

More Durable

More Interactive User Experience

More Flexible Content Protection:AAC, BD+ Renewability Technologyand ROMMark


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Thank YouThank You

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