Blu ray disc new1
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abcSchool of Electronics & communication
engineering Lovely Professional University Phagwara, Punjab-
144401
Under the guidance of:xyzAssistant Professor
BLU-RAY DISC
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OVERVIEW•Introduction•The Name •Foundation•Types of BD•The Technology•Working of Blu-ray•Disc Characteristics•Comparison•Benifits•Ongoing Developments•Conclusion
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INTRODUCTION
• Blu-ray, also known as Blu-ray Disc (BD), is the name of a next-generation optical disc format jointly developed by the Blu-ray Disc Association (BDA).
• The format was developed to enable recording, rewriting and playback of high-definition video (HD), as well as storing large amounts of data.
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THE NAME
• The 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.
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FOUNDATION
• The first blue laser was developed in 1996 by Shuji Nakamura (Nichia Corporation).
• The first Blu-ray Disc prototypes were unveiled in October 2000.
• In 2002, an alliance was formed, called the Blu-ray Disc Association.
• Afterwards, it continued to be developed until its official release in June 2006.
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TYPES OF BD
SINGLE LAYER :- Can hold data up to 25 GB that means 2 hrs of HD
video or about 13 hrs of standard video.
DOUBLE LAYER :- Can hold data up to 50 GB that means 4.5 hrs of HD
video or more than 20 hrs of standard video.
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THE TECHNOLOGYPits : spiral grooves that
run from the centre of the disc to its edges
Bumps : other sides of these edges.
Track pitch : it is the distance between the two tracks (of pits) on the surface.
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WORKING OF BLU-RAY
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 these change of pits to land and play the movie or program that is stored on the disc.
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DISC CHARACTERISTICS• Pit size – 0.15 microns
( more than twice as small as the pits on DVD )
• Track-pitch is : 0.30 microns
• Laser needed : blue laser (405 nm)
• Data transfer rate : 36 Mbps
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DISC CHARACTERISTICS(cont…)• 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 405 nm• The smaller laser,
compared to the DVD and CD, keeps the process more efficient (~5 mW)
Courtesy Blu-ray Disc Founders “Blu-ray Disc Format White Paper”
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BACKWARD COMPATIBILITY
• A few early Blu-ray Disc players released in 2006 could play DVDs but not CDs (the LG BH100, Pioneer BDP-HD1, and Sony BDP-S1).
• But all current Blu-ray Disc players are capable of both DVD and CD playback.
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BENEFITS OF BLU-RAY
• Shorter wavelength than red laser (650nm), which makes it possible to focus the laser spot with even greater precision.
• Allows data to be packed more tightly and stored in less space.
• Possible to fit more data on the disc even though it's the same size as CD/DVD.
• With the change of numerical aperture to 0.85 is what enables Blu-ray Disc to hold 25GB/50GB.
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BLU RAY ‘S DURABILITY ADVANTAGE
Various hard coating technologies make Blu ray disc most durable and family -friendly”
Hard-coating technology provides resistance to:- Finger prints- Marks- Scratches- Dust
Much more ROBUST than today’s polycarbonate-based CD/DVD’s
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BLU-RAY’S DENSITY ADVANTAGE
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
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ONGOING DEVELOPMENTS
• Hitachi created a 100GB disc that could be used to store
7 hours of 32 Mbit/s video (HDTV).• Recently they have created a working experimental Blu-
ray Disc capable of holding 200 GB of data on a single side, using six data layers.
• Growing at same pace as from CD to DVD.• Blu-ray faces competition from video on demand.
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CONCLUSION
It’s very likely that the technology will be adopted as the next generation optical disc format for PC data storage and replace technologies such as CD, DVD, and HD-DVD etc.
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Thank You