Laser TV

Laser TV

Laser TV is a new video display technology using laser optoelectronics.


Proposed as long ago as 1966 [cite web
title=2006 Laser Projection Systems Report
publisher= [ Insight Media]
] , laser illumination technology remained too costly to be used in commercially viable consumer products [cite web
title=Big Blue Laser in a Small Package: Is it Coming Soon? - Greg Niven
publisher= [ Coherent Inc.]
] and too poor in performance to viably replace lamps except in some rare ultra-high-end projectors [cite web
title=Z*Tron Vision projector (ZTV)
publisher= [ Metatron Zone Management]
] .At the Las Vegas Consumer Electronics Show in 2006, [ Novalux Inc.] , developer of [ Necsel] semiconductor laser technology, demonstrated their laser illumination source for projection displays and a prototype rear-projection "laser" TV. [cite web
title=Novalux Wins Insight Media “Best Buzz” Award at Consumer Electronics Show 2006
publisher= [ Insight Media]
] First reports on the development of a commercial Laser TV were published as early as February 16, 2006 [cite web
title=Mitsubishi Joins the Laser-TV Club
publisher= [ Display Daily]
] [cite web
title=Mitsubishi Harnesses Colored Lasers to Produce New-Generation Lightweight HDTV
publisher= [ The New York Times]
] with a decision on the large-scale availability of laser televisions expected by early 2008. [cite web
title=Laser TV Technology: Plasma and LCD Killer
] On January 7 2008, at an event associated with the Consumer Electronics Show 2008, Mitsubishi Digital Electronics America, a key player in high-performance red-laser [cite web
title=Mitsubishi Digital Electronics America, Inc. Announces Screen Sizes for LaserVue™ Laser TV Shipping in Third Quarter 2008
publisher= [ Mitsubishi Digital Electronics America, Inc.
] and large-screen HDTV markets, unveiled their first commercial Laser TV, a 65" 1080p model. [cite web
title=Mitsubishi Unveils Laser TV, 3-D Home Theater
publisher= [ MIT]
] [cite web
title=HDTVs: Mitsubishi Laser TV's Colors Look Even Juicier Than the Girls on the Set
] [cite web
title=Mitsubishi laser TV unveiled
] First audiences who were shown reference clips from popular movies reported that they were blown away by a Laser TV's hitherto unseen color-display prowess. [cite web
title=Color Burns Bright With Mitsubishi's Laser TV
publisher= [ Popular Science Blog]
] Some even described it as being too intense to the point of seeming artificial. [cite web
title=Mitsubishi Laser TV: Colors May Be Too Brilliant
publisher= [ Today @ PC World]
] This Laser TV, branded "Mitsubishi LaserVue TV", is expected to go on sale in late September 2008 in the North American market with a RRP of $6,999. [cite web
title=Mitsubishi announces prices for its laser-based HDTV
] [cite web
title=Mitsubishi Electric LaserVue™ - FAQ
publisher= [ Mitsubishi Digital Electronics America, Inc.]


Lasers may become an ideal replacement for the UHP lamps [cite news
title=The Technology Behind the Display
] which are currently in use in projection display devices such as rear projection TV and front projectors. Current televisions are capable of displaying only 40% of the color gamut that humans can potentially perceive.cite journal
title=Laser-Sharp Color
journal=Popular Science
] In contrast, proponents of Laser TV technology claim that the standard will be able to reproduce about 80% of the colors visible to the human eye.

A Laser TV requires lasers in three distinct wavelengths: Red, Green and Blue. While red laser diodes are commercially available, there are no commercially available green and blue laser diodes which can provide the required power at room temperature with an adequate life time. Instead frequency doubling can be used to provide the blue and green wavelengths. Several types of lasers can be used as the frequency doubled sources: fibre lasers, inter cavity doubled lasers, external cavity doubled lasers, eVCSELs and OPSLs (Optically Pumped Semiconductor Lasers). Among the inter cavity doubled lasers VCSELs have shown much promise and potential to be the basis for a mass produced frequency doubled laser.

A VECSEL is a vertical cavity, and is composed of two mirrors.On top of one of them is a diode as the active medium.These lasers combine high overall efficiency with good beam quality.The light from the high power IR-laser diodes is converted into visible light by means of extra-cavity waveguided second harmonic generation. Laser-pulses with about 10 kHz repetition rate and various lengths are sent to a Digital Micromirror Device where each mirror directs the pulse either onto screen or into the dump. Because of the well known wavelengths all coatings can be optimized to reduce reflections and therefore speckle.Fact|date=March 2007


One major claim of laser advocates is the ability to produce undiluted, perfect colors allowing precise hue mixing. Advocates claim that 90% of the perceptible color gamut can potentially be reproduced. [cite web
title=The Technology Behind the Display: Display Applications: Home Theater
] Other improvements that laser advocates claim are bulbs that will never blow out, and increased efficiency by using two-thirds less power than traditional rear projection televisions. Historically, however, lasers have been too bulky and expensive for widespread adoption.

The laser technology advocates claim that the technology will allow displays with a richer, more vibrant color palette than the conventional plasma, LCD or CRT displays.

They also claim the displays will: [cite web
title=Forget plasma and LCD TV - the Laser TV is coming!
* be half the weight and cost of Plasma or LCD displays
* require around 25% of the power required by Plasma or LCD displays
* be very thin like Plasma and LCD displays are today
* have a very wide colour gamut. Twice the color of today's HDTVs.
* have a 50,000 hour life
* maintain full power output for the lifespan of the laser, resulting in a picture that doesn't progressively degrade over time, such as with plasma and LCD technology


Together with the advantages of laser sources, there are reports that also describe some of the current shortcomings of laser displays, [cite paper
author = Brennesholtz, et al
title = Laser Projection Systems
version =
publisher = Insight Media
date = 2005-08-19
url =
format = PDF
accessdate = 2007-01-29
] such as the following:
* Safety. The high power emitted by the coherent laser sources is inherently dangerous to human vision. Proponents claim that integrating the devices with the needed diffusion filters removes this risk.
* Speckle. Due to the narrowband coherent light source, speckle will be an issue at the display. This has also been a problem in laser lighting displays and has been solved through modulation of the light source thus widening the bandwidth and reducing the possibility for coherent interference. Proponents claim that this issue can be minimized by the use of diffusing elements and multiple sources. These, however, may impact display resolution and system cost.


External links

* [ - How Laser TV works, videos, and up to date news]
* [ Laser TV News]
* [ - Complete website and forum about the lasertv technology]
* [ - Blog and guide covering the future of Laser TV]
* [ Laser TV is coming soon ?]
* [ Evans and Southerland Laser Projector]
* [ Laser-TV,Sed-Tv,Oled-Tv News and Infos]
* [ Mitsubishi LaserVue web site]

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