LaserDisc

People used big discs to watch movies.

These discs were large. They were like big music records.

A laser reads tiny marks on the disc. These marks tell the player what to show. The marks help make the picture and the sound.

The picture on these discs looked very good. They could even play surround sound. This made the movies feel real.

Many people in Japan loved using them. They were very popular for renting movies. It was a fun way to watch films at home.

Long ago, people used large discs to watch movies at home.

These discs were about 12 inches wide. This size is much like a music record.

How do they work? A laser reads the disc surface. The surface has tiny pits and flat areas called lands.

As the disc spins, the laser reads these patterns. This helps the player rebuild the video and sound.

LaserDiscs had very clear pictures. They had many more lines of detail than old videotapes. They also offered great sound. Some discs had digital audio that sounded like a CD. They were even the first to use surround sound.

There were different ways the discs could spin. Some spun at a steady speed. We call this constant angular velocity, or CAV. These were good for special features. Other discs slowed down as they played. This is called constant linear velocity, or CLV. This way let people fit a whole movie on one side.

Many people in Japan loved using them. They were very popular for renting films. Even today, some people collect them.

LaserDisc was a special way to watch movies at home using large discs.

It was the very first way to store video on an optical disc. This means the information is read using a beam of light. These discs were about 12 inches wide. This is much larger than a modern DVD. They were also similar in size to a music record. Many people loved them because the picture and sound were very high quality.

How does the disc actually work? The surface of the disc has tiny bumps called pits and flat areas called lands.

As the disc spins, a laser shines on these patterns. The player uses the light to rebuild the video and sound signals. Most LaserDiscs used an analog video signal. This means the signal is a continuous wave. However, many discs also had digital audio. This digital sound could be as clear as a CD. Some even offered surround sound to make movies feel real.

People worked hard to create this technology for many years. In 1963, David Paul Gregg and James Russell developed a system using transparent discs. Later, in 1969, Philips made a version that used reflective technology. MCA and Philips began working together in the early 1970s. They showed the world their new video disc in 1972. The first commercial version, called DiscoVision, arrived in the United States in 1978. The first movie released on this format was the film Jaws.

There were different ways the discs could spin during playback. One way is called constant angular velocity, or CAV.

In CAV mode, the disc spins at a steady speed. This allowed people to use features like slow motion or freeze-frame. Another way is called constant linear velocity, or CLV.

These discs slow down as they play to fit more video on one side. Most movies used CLV so they could fit on a single disc. This made it easier to watch a whole film without switching discs.

LaserDisc was not popular everywhere in the world. In North America and Europe, the players were often too expensive. However, the format was very popular in Japan and parts of Southeast Asia. In Hong Kong, it was the main way people rented movies during the 1990s. About 16.8 million players were sold around the world. Pioneer was a major maker and stopped making players in July 2009. Even though DVDs replaced them, some people still collect LaserDiscs today.

LaserDisc (LD) was the first commercial optical disc storage medium used for home video.

Developed through a partnership between Philips, Pioneer, and the movie studio MCA, it offered a high-quality way to watch films. While it eventually became a niche format, it laid the essential groundwork for modern technologies like the Compact Disc (CD) and the DVD. The discs were large, typically 12 inches in diameter, which is similar to the size of a phonograph record.

Unlike later formats that are entirely digital, LaserDisc primarily stored an analog video signal. This allowed for a high resolution of 425 to 440 horizontal lines. This resolution was nearly double that of competing videotape formats like VHS and Betamax.

The mechanism of a LaserDisc relies on physical patterns etched into the disc surface. These patterns consist of tiny pits and flat areas called lands.

To play the disc, a player shines a laser onto these patterns as the disc spins. The player's circuitry reads the light reflected from the pits and lands to reconstruct the original signal. For video, a carrier frequency is modulated by the video signal to create this physical pattern.

Audio was also stored on the disc. While early discs used analog stereo via frequency modulation, later versions included digital audio. This digital audio used pulse-code modulation (PCM), which provided CD-quality sound. Some advanced discs even supported digital surround sound formats like Dolby Digital and DTS. To achieve this, the digital PCM audio was encoded by summing its signal with the video and analog audio carriers. This created a square wave, where the frequency of transitions represented video information and the duty cycle variations represented audio.

There were three distinct ways these discs could rotate during playback. The first was Constant Angular Velocity (CAV), also known as Standard Play. In CAV mode, the disc spins at a steady speed, such as 1,800 rpm for NTSC systems.

This constant speed allowed for advanced features like freeze-frame, variable slow motion, and reverse playback. Because each frame is read once per revolution, CAV discs could store about 30 minutes of video per side. The second type was Constant Linear Velocity (CLV), or Extended Play. These discs gradually slow their rotation from 1,800 rpm down to 600 rpm to increase storage capacity. This allowed for up to 60 minutes of video per side, meaning a full movie could often fit on one disc. The third type was Constant Angular Acceleration (CAA). Introduced in the early 1980s, CAA changed the rotation speed in controlled steps rather than a gradual slowdown. This helped reduce crosstalk distortion and tracking issues found in CLV discs.

The history of this technology began long before the first commercial player. In 1963, David Paul Gregg and James Russell developed a transparent disc-based system. This technology was patented in 1970, and MCA acquired the rights in 1968. Around 1969, Philips developed a different videodisc using reflective technology, which was more advantageous. MCA and Philips began collaborating in the early 1970s and demonstrated the format in 1972. The format was first marketed in the United States in 1978 under the name DiscoVision. The first commercial title released in North America was the film *Jaws* on December 15, 1978.

Later, in 1980, Pioneer took a larger role and rebranded the format as LaserDisc.

Despite its high quality, LaserDisc did not achieve mass-market success in North America or Europe. This was mainly because the players were expensive and the format could not record video. However, it was very successful in other parts of the world. It was significantly more popular in Japan and wealthier regions of Southeast Asia, such as Singapore and Malaysia. In Hong Kong, it became the dominant format for renting videos during the 1990s. In Japan, market penetration reached about 10% of households by 1999. In contrast, only about 2% of U.S. households, or roughly two million people, owned a player. Globally, a total of 16.8 million LaserDisc players were sold, with Pioneer accounting for 9.5 million of those units.

LaserDisc had several notable uses and surprising facts. The British Broadcasting Corporation (BBC) used the format for the BBC Domesday Project in the mid-1980s. They also used a Sony variant called the CRVdisc to broadcast television idents in the 1990s. The format was a favorite among "videophiles" who wanted the best possible picture and sound. Even as DVDs became popular, some specialized releases continued. For example, the film *Star Wars: Episode I – The Phantom Menace* was one of the first to include 6.1 channel Dolby Digital EX Surround in Japan. The very last known LaserDisc release was a Japanese karaoke title called *Onta Station vol. 1018*, issued on March 21, 2007.

The legacy of LaserDisc is found in the evolution of all modern optical media. The concepts of using lasers to read pits and lands on a spinning disc were used to create the CD and the DVD. While the video signal on a LaserDisc was analog, the digital audio technology helped bridge the gap to a fully digital future. The format eventually faded as the DVD became the global standard. Pioneer stopped producing LaserDisc players in July 2009. They continued to provide maintenance services until September 30, 2020, when their parts inventory was finally exhausted. Today, a small community of collectors in the United States and Japan still preserves these large, high-quality discs.