Davis Motor Sales banner ad

It’s called Blu-ray technology and it has become a standard feature of many personal media and entertainment devices, including the popular Playstation 3 video game console. However, of the millions of people who have heard of, used, or owned a Blu-Ray player, many may not know just what makes a Blu-Ray disc and its player different than its DVD relative.

At the heart of both the DVD and Blu-Ray is a laser sensor that scans over the “data layer” or coded side of the disc as it spins inside the player. From there, the laser transfers the information into a digital signal, which is then converted to the picture on your TV screen. However, the central distinction between a Blu-Ray player and a DVD player is that the Blu-Ray uses a blue optical laser instead of the red laser used by a DVD player. The blue laser has a smaller wavelength than its DVD competitor (405 nanometers, compared to the red laser's 650 nanometers), allowing it to be focused more precisely so that it can read data stored in smaller “packets” or groupings of coding. The smaller wavelength, combined with the smaller data packet size, allows for not only a greater amount of data to be stored, but also for faster reading of the data as the disc spins.

Because of the differences between a Blu-Ray player's blue laser and the red laser used by DVD players, Blu-Ray discs are constructed differently than DVDs. Whereas a DVD has its data layer sandwiched between two outer layers of polycarbonate plastic, a Blu-Ray disc has its data layer on top of a single layer of polycarbonate. A hard protective layer is then placed over the data layer to protect it from scratches and fingerprints. Placing the Blu-Ray’s data layer on top of a single polycarbonate layer allows the disc to be read more easily by the Blu-Ray player while preventing errors that can occur due to refraction or an uneven application of the disc layers, both of which are issues common to DVDs.

Going back to the essential commonality between DVDs and Blu-Ray discs (the use of a laser sensor to decipher the coding), it’s important to understand that there is a little more to it for the Blu-ray disc.

When a Blu-Ray disc is inserted into a player, the player's laser will scan the data packets near the center of the disc to get all of the basic information that it needs to play the disc. This data also contains information about how the disc is encrypted, allowing the player to decrypt the data, which was originally encrypted as a measure against piracy. Once the player has the necessary data and encryption details, it can then begin playing the disc, reading the data packets as the disc spins and converting them to digital video and audio information. This information is then sent to the television, monitor or other device connected to the Blu-Ray player, generally through the use of separate component cables or an HD cable connection. From there, the digital code is converted into the high-definition image you see on you TV screen.

Luke Short
Some information provided by eHow.com

© Copyright 2015 SurfKY News Group, Inc. All rights reserved. This material may not be published, broadcast, or rewritten without permission. SurfKY News encourages you to share this story on social media.

Posted on 2/2/14
3/13 - 16
3/13 - 16

Most Read This Week

March 02, 2015 8539

Madisonville Teen Faces Numerous Drug Charges

in Local (Hopkins) Top News by Madisonville Police Department/Hopkins County Detention Center
February 25, 2015 7888

Multi-Agency Investigation Nets Large-Scale Meth…

in Top News For All Sites by Trooper Stu Recke
February 24, 2015 7703

Two Charged in Central City Meth Bust

in Local (Muhlenberg) Top News by Trooper Stu Recke
February 22, 2015 7542

Easter Cuties Pageant in Memory of Shanice Bean

in Top News For All Sites Touching Hopkins by Tammy Holloway, SurfKY News
February 25, 2015 6229

New Asian Restaurant Coming to Madisonville

in Local (Hopkins) Top News by Gary Gates, SurfKY News
February 23, 2015 5503

Fire Departments Respond to Wester's Body Shop

in Local (Muhlenberg) Top News by Shawn Freels

Most Read This Month

February 12, 2015

UPDATE: Name of Pennyrile Fatality Officially…

in Top News For All Sites Touching Hopkins by Doreen Dennis, SurfKY News
February 09, 2015

Police Pursue Man after Fight at Taco Bell

in Local (Hopkins) Top News by Madisonville Police Department/Hopkins County Detention Center

Stories Trending Today

March 02, 2015 8539

Madisonville Teen Faces Numerous Drug Charges

in Local (Hopkins) Top News by Madisonville Police Department/Hopkins County Detention Center
March 02, 2015 3254

HCSO, MPD Join to Bust Alleged Drug Trafficking…

in Local (Hopkins) Top News by Hopkins County Sheriff's Office
March 03, 2015 3151

Three Arrested during Traffic Stop

in Local (Hopkins) Top News by Madisonville Police Department/Hopkins County Detention Center
March 02, 2015 2322

Officers Respond to Complaint of Drug Use; Arrest…

in Local (Hopkins) Top News by Hopkins County Sheriff's Office/Hopkins County Detention Center
March 02, 2015 1945

Job Fair Tomorrow in Madisonville

in Hopkins News by Kentucky Career Center
March 02, 2015 1781

UPDATE: Escapee Apprehended

in Top News For All Sites by Stu Recke
March 02, 2015 1672

Madisonville Police Arrest Reports - March 2, 2015

in Hopkins News by Madisonville Police Department
March 02, 2015 1400

Dawson Springs Man Charged Multiple Offenses Plus…

in Hopkins News by Melissa Heflin
March 02, 2015 1387

Locals Flock to Yoga for Unique Wellness Technique

in Local (Hopkins) Top News by Doreen Dennis, SurfKY News
March 02, 2015 1312

Greenville Police Department Reports Released;…

in Local (Muhlenberg) Top News by Wes Miller