Home »

Blu-ray

The meaning of «blu-ray»

The Blu-ray Disc (BD), often known simply as Blu-ray, is a digital optical disc storage format. It is designed to supersede the DVD format, and capable of storing several hours of high-definition video (HDTV 720p and 1080p). The main application of Blu-ray is as a medium for video material such as feature films and for the physical distribution of video games for the PlayStation 3, PlayStation 4, PlayStation 5, Xbox One, and Xbox Series X. The name "Blu-ray" refers to the blue laser (which is actually a violet laser) used to read the disc, which allows information to be stored at a greater density than is possible with the longer-wavelength red laser used for DVDs.

The plastic disc is 120 millimetres (4.7 in) in diameter and 1.2 millimetres (0.047 in) thick, the same size as DVDs and CDs.[5] Conventional or pre-BD-XL Blu-ray Discs contain 25 GB per layer, with dual-layer discs (50 GB) being the industry standard for feature-length video discs. Triple-layer discs (100 GB) and quadruple-layer discs (128 GB) are available for BD-XL re-writer drives.[6]

High-definition (HD) video may be stored on Blu-ray Discs with up to 1920×1080 pixel resolution, at 24 progressive or 50/60 interlaced frames per second. DVD-Video discs were limited to a maximum resolution of 480i (NTSC, 720×480 pixels) or 576i (PAL, 720×576 pixels).[7] Besides these hardware specifications, Blu-ray is associated with a set of multimedia formats.

The BD format was developed by the Blu-ray Disc Association, a group representing makers of consumer electronics, computer hardware, and motion pictures. Sony unveiled the first Blu-ray Disc prototypes in October 2000, and the first prototype player was released in Japan in April 2003. Afterwards, it continued to be developed until its official worldwide release on June 20, 2006, beginning the high-definition optical disc format war, where Blu-ray Disc competed with the HD DVD format. Toshiba, the main company supporting HD DVD, conceded in February 2008,[8] and later released its own Blu-ray Disc player in late 2009.[9] According to Media Research, high-definition software sales in the United States were slower in the first two years than DVD software sales.[10] Blu-ray faces competition from video on demand (VOD) and the continued sale of DVDs.[11] In January 2016, 44% of U.S. broadband households had a Blu-ray player.[12] For playback of 4K content, the BDA introduced a variant of Blu-ray called Ultra HD Blu-ray.

The information density of the DVD format was limited by the wavelength of the laser diodes used. Following protracted development, blue laser diodes operating at 405 nanometers became available on a production basis, allowing for development of a more-dense storage format that could hold higher-definition media, with prototype discs made with diodes at a slightly longer wavelength of 407 nanometers in October 1998.[13][14] Sony started two projects in collaboration with Panasonic, Philips, and TDK,[15] applying the new diodes: UDO (Ultra Density Optical),[16] and DVR Blue (together with Pioneer),[17] a format of rewritable discs that would eventually become Blu-ray Disc (more specifically, BD-RE). The core technologies of the formats are similar. The first DVR Blue prototypes were unveiled by Sony at the CEATEC exhibition in October 2000.[18] A trademark for the "Blue Disc" logo was filed on February 9, 2001.[19] On February 19, 2002, the project was officially announced as Blu-ray Disc,[20][21] and Blu-ray Disc Founders was founded by the nine initial members.

Related Searches

Blu-ray Disc recordableBlu-ray Disc AssociationBlu-ray ripper
Optical disc driveUltra HD Blu-rayHigh-definition optical disc format war
Keep caseComparison of high-definition optical disc formatsDisc rot

Choice of words

b-lu-ray_ _
bl-u-ray_ _
blu--ray_ _
blu-r-ay_ _
blu-ra-y_ _
blu-ray-_ _
blu-ray:_ _ _ _
blu-ray_ _ _ _
blu-ray_ - _ _ _
blu-ray-_ _ _ _
blu-ray _ _ _ _ _
blu-ray _ - _ _ _ _
© 2015-2021, Wikiwordbook.info
Copying information without reference to the source is prohibited!
contact us mobile version