What’s the Blu-ray Disc

Structure of the BD-Video Disc The Blu-ray Disc is an optical disc with the same dimensions as the DVD disc: 12 cm in diameter and 1.2 mm in thickness. By using a combination of the 405-nm-wavelength blue-violet laser, w hich is a shorter wavelength than the red laser used by DVD, and a high-density objective lens with a numerical aperture of 0.85, BD uses a laser beam spot that is only about 1/5 the size used by DVD. Thanks to these technologies, a single-layer BD-Video disc can store five times more data than a DVD disc.

4. BD-J for Extensive Interactive Functions
S ome BD-Video disc is equipped with an extended function based on Java™ technology, called BD-J, to provide various interactive features. For example, this can be used to program various operations, s uch as displaying a pop-up menu while playing a BD-Video disc, and activating a keyword search. With unlimited application possibilities, BD-J offers interactive enjoyment that is simply not possible with conventional AV software.


Others


1. What is Blu-ray?
Blu-ray is a new optical disc format with over five and a half times the storage capacity of a standard DVD (25 GB versus 4.5 GB). A dual-layer Blu-ray disc can hold up to 50 GB of information. With that increased storage, movie studios can finally provide movies on disc in high definition, offering 6x the resolution or image detail of DVD and up to 8 channels of lossless (better than CD quality) digital sound. The new format can also provide interactive features that go well above anything ever offered before.


2. Is Blu-ray different than HDTV
HDTV, or high definition television, is a new broadcasting format that offers widescreen, high resolution images offering 6x the resolution or image detail of DVD, with up to 5.1 channels of digital audio. Until now, the signals were only available through over the air transmissions (via an antenna), or through digital cable and satellite signals. You can not get HD signals from a standard video tape or DVD. An HDTV is a high resolution video display that is capable of receiving and displaying these HDTV broadcasts or images. Blu-ray is a complement to your HDTV. It’s a disc media format that has enough storage to include an entire movie, plus soundtracks and bonus materials, recorded in the high definition format. You can play Blu-ray discs back on your HDTV and see the same, if not better image and sound quality as you do from HDTV broadcasts.