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Laser Phosphor Display (LPD) is a large-format display technology similar to the cathode ray tube (CRT). Prysm, Inc., a video wall designer and manufacturer in Silicon Valley, California, invented and patented the LPD technology. The key components of the LPD technology are its TD1 tiles, its image processor and its backing frame that supports LPD tile arrays. The company unveiled the LPD in January 2010.

Operation principles
The concept behind the LPD technology is quite simple. LPD uses a set of movable mirrors to direct several beams of light from several ultra-violet lasers onto a screen made of a plastic-glass hybrid material coated with color phosphor stripes. The laser draws an image onto the screen by scanning line by line from top to bottom. The energy from the lasers' light activates the phosphors, which emit photons, producing an image.

The building blocks of every Prysm video wall are the next-generation Laser Phosphor Display (LPD) tiles called the TD1. A TD1 tile is a 25-inch diagonal, bezel-free, tile-based building block. A variable number of TD1 Tiles can be arranged in arbitrary configurations to form videowalls in various sizes and shapes.

Advantages
The main difference between the LPD and CRT technologies is that the first relies on laser whereas the second uses an electron gun to activate the phosphorescent substance that creates images.

Another competitor, plasma display technology, consists of small cells of ionized gases that emit light–a process that requires a relatively large amount of power. And a conventional laser television, such as the LaserVue, made by Mitsubishi, uses red, blue, and green lasers and a micromirror device that combines and directs the light. This is essentially a rear-projection display, but because of its high price tag, it hasn’t become widely popular.

LPD requires less electricity than competing technologies including LCD and light-emitting diode (LED). IAC reported a 70% reduction in power by switching to LPD, and Prysm says LPD uses up to 75 percent less power than most other display technologies on the market. An LPD device differs significantly from LCD in that more than 90 percent of the original light is lost in the latter process.

The TD1, the building block of a video wall, does not suffer the problem of low brightness, contains no toxic component, has no consumables, and generates little heat. Its displays are highly configurable and can be stacked seamlessly to create supersized high-resolution video walls of almost any size or shape.

According to Prysm, the LPD technology has other advantages including great black levels, a wide 180-degree viewing angle, a 65,000-hour panel life with no burn-in issues, completely recyclable components, and their production process is mercury free.[*]

One disadvantage of LPD is that the displays are deeper than some competing technologies, each TD1 Tile including all peripherals measures almost 17 inches deep. Depending on the frame type, the total installed depth varies between 24 and 30 inches.

LPD competes with liquid crystal display (LCD), plasma display panel (PDP), and other large-format display technologies.

Applications
The first embodiment of this technology, the TD1 tile was launched in June 2010. Prysm began shipping TD1 tiles in February 2011.

LDP is used as a giant touchscreen display, a digital signage and in customer experience centers. It works with the Prysm “digital workplace platform” software. The first LPD retail installation went on display at American Eagle Outfitters in New York in late 2010. Other LPD deployments include a 120-foot long videowall at InterActiveCorp (IAC) in New York, a 40-foot, 180-degree, interactive videowall at General Electric’s (GE) Customer Experience Center in Toronto, and several videowalls for Dubai TV.

Patents

 * Composite and other phosphor materials for emitting visible light and applications in generation of visible light including light-emitting screens. By Roger A. Hajjar, David Kent, Phillip Malyak. July 31, 2012.
 * Composite and other phosphor materials for emitting visible light and applications in generation of visible light including light-emitting screens. By Bukesov; Sergey A. April 4, 2013.