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Technology Introduction
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What is Blu-ray Disc?
4
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word blue is intentionally omitted because a daily-used term cannot be registered as a trademark.
As we go through the following sections you will see that the BD is really an enhanced version of the standard
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1. Blu-ray Disc
Numerical Aperture (NA)
Video Resolution (Max)
Video Bit Rate (Max)
Video Codecs
Audio Codecs
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1. Blu-ray Disc
Blue Laser Enables Increased Density
Blue Laser Enables Increased Density
S L 4.7 G B 15 G B (3 x DV D) 25 G B (5 x DV D)700 MB
DL 8.5 G B
30 G B (3.5 x DVD)
50 G B (6 x DV D)
0.6 mm
0.1 mm
B lu-ray
Disc
B lu
-ray
Disc
0.6 mm
C D
C D
DV D
DV D
HD-DVD
HD
-DVD
1.2 mm
Label S ide Label S ide Label S ide Label S ide
780nm
780nm
650nm
650nm
405nm
405nm
405nm
405nm
NA 0.85
NA 0.65
NA 0.6
NA 0.45
0.1 mm
Optical Disc Data Layer and Density Comparison Diagram
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1. Blu-ray Disc
Max. Transfer data rate comparison
CD 1.4Mbps1.4Mbps
DVD 10.08Mbps10.08Mbps
BD
-ROM
54Mbps
54Mbps
HD DVD 36.55Mbps36.55Mbps
0 10 20 30 40 6050 70
72Mbps
72Mbps
BD-RE/R x2
Video Max rate: 40Mbps
Video Max rate: 28Mbps
Video Max rate: 9.8Mbps
Higher Transfer Rate realize Better Picture Quality
(*)
Figure 2
Optical Disc Data Transfer Rate Comparison Chart
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1. Blu-ray Disc
Capacity and (
Capacity and (
λ
λ
, NA )
, NA )
1.2mm
0.6mm
DVD
1.2mm
0.1mm
Blu-ray Disc
100% 20%
Light spot (area size)
0.6 0.85
Higher NA: x2 high density
650nm 405nm
Shorter wavelength: x2.6 high density
Protection layer thickness
Adoption of λ（wavelength）= 405nm Blue Violet laser and
NA(Numerical Aperture)= 0.85 realized 1/5 beam spot size of DVD.
Figure 3
Blu-ray verse DVD Protective Layer and NA Comparison Diagram
A blue laser has a
(
meters) long
-- this is more than twice as small as the pits on a DVD.
from 0.74 microns to
fi ve times the amount of information that can be stored on a DVD.
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1. Blu-ray Disc
Track Pitch
Data
Tracks
Blu-ray Disc
(BD)
Standard DVD
Data
Tracks
Track Pitch
0.32um
0.72um
0.40um
0.15um
Pit Length
Pit Length
Figure 4
Blu-ray verse DVD Track Pitch and Pit Length
is a measure of the lens system’s ability to gather light, and therefore, detect fi ne detail at
When light (or Laser) hits an object, such as a pit, on a DVD data layer, it diffracts and splits into several beams
increases by placing the objective lens as closer to the disc surface, and reducing
thickness. This is exactly what the BD system designers did. The higher the Numerical
Aperture fi gure the better the optical system can read the much smaller pits on the BD.
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1. Blu-ray Disc
Data Layer
1.2mm
CD
Infrared
Laser
Data Layer
0.6mm
DVD
Red
Laser
Data Layer
0.1mm
BD
Blue
Laser
780 MB Capacity
4.7 GB Capacity
(Single Layer)
25 GB Capacity
(Single Layer)
Figure 5
Evolution of Consumer Optical Discs
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1. Blu-ray Disc
Numerical Aperture (NA)
Video Resolution (Max)
Video Bit Rate (Max)
Video Codecs
Audio Codecs
As you can see from this specifi cation comparison table even though HD-DVD uses the same 405nm Blue Laser
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1. Blu-ray Disc
feature for the BDP-S1.
output only; 720p/1080i signals available through HDMI or component video)
As with CD and DVD, BD media comes in pre-recorded, recordable and rewritable disc formats. The pre-
All three BD types come in two versions: single layer and double layer. A double layer disc may hold up to twice
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