Laser TV
This article's tone or style may not reflect the encyclopedic tone used on Wikipedia. (October 2020) |
Laser color television (laser TV), or laser color video display, is a type of television that utilizes two or more individually modulated
The special case of one ray reduces the system to a
Laser TV technology began to appear in the 1990s. In the 21st century, the rapid development and maturity of
History
The laser source for television or
Proposed in 1966,[3] laser illumination technology remained too costly to be used in commercially viable consumer products.[4] 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.[5] First reports on the development of a commercial Laser TV were published as early as February 16, 2006[6][7] with a decision on the large-scale availability of laser televisions expected by early 2008.[8] 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[9] and large-screen HDTV markets, unveiled their first commercial Laser TV, a 65" 1080p model.[10][11][12] A Popular Science writer was impressed by the color rendering of a Mitsubishi laser video display at CES 2008.[13] Some even described it as being too intense to the point of seeming artificial.[14] This laser TV, branded "Mitsubishi LaserVue TV", went on sale, November 16, 2008 for $6,999, but Mitsubishi's entire laser TV project was killed in 2012.[15][16][17]
LG introduced a front projected laser TV in 2013[18] as a
In
Principle
Laser TV images are
Technology
Lasers may become an ideal replacement for the
Color television requires light in three distinct
The blue laser diodes became openly available around 2010.
A
Characteristics
Laser TV images are reflected by the screen and enter the human eye for imaging. According to ophthalmologists and professional evaluations, laser TV products are display products that are harmless to the naked eye. The screen has no electromagnetic radiation, which is eye-protecting, healthy and comfortable.[remove or clarification needed] Compared with paper reading comfort, it is 20% higher. Laser TVs are mainly large-sized, with pure light sources, bright colors, and authenticity, also support 4K display resolution.
Laser TVs have lower power consumption than LCD TVs of the same size. For example, a 100-inch laser TV consumes less than 300 watts, which is ½-⅓ of the same size LCD TV. Laser TVs are about one-tenth the weight of LCD TVs of the same size, and people can watch 80-inch laser TVs at a viewing distance of 3 meters.[25]
Assembly
Laser signal modulation
The
Horizontal and vertical refresh
A rapidly rotating polygonal mirror gives the laser beam the horizontal refresh modulation. It reflects off of a curved mirror onto a galvanometer-mounted mirror which provides the vertical refresh. Another way is to optically spread the beam and modulate each entire line at once, much like in a DLP, reducing the peak power needed in the laser and keeping power consumption constant.
Display characteristics
- Maintain full power output for the lifespan of the laser; the picture quality will not degrade
- Have a very wide color gamut, which can produce up to 90% of the colors a human eye can perceive by adjusting the wavelength of the laser[26]
- Capable of displaying 3D stereoscopic video
- Can be projected onto any depth or shape surface while maintaining focus.
Applications
There are several realizations of laser projectors, one example being based on the principle of a flying light spot writing the image directly onto a screen. A laser projector of this type consists of three main components — a laser source uses the video signal to provide modulated light composed of the three sharp spectral colors — red, green, and blue — which a flexible, fiber-optic waveguide then transports to a relatively small projection head. The projection head deflects the beam according to the pixel clock and emits it onto a screen at an arbitrary distance. Such laser projection techniques are used in handheld projectors, planetariums, and for flight simulators and other virtual reality applications.
Due to the special features of laser projectors, such as a high depth of field, it is possible to project images or data onto any kind of projection surface, even non-flat. Typically, the sharpness, color space, and contrast ratio are higher than those of other projection technologies. For example, the on-off contrast of a laser projector is typically 50,000:1 and higher, while modern DLP and LCD projectors range from 1000:1 to 40,000:1. In comparison to conventional projectors, laser projectors provide a lower luminous flux output, but because of the extremely high contrast the brightness actually appears to be greater.
Development status
The examples and perspective in this article may not represent a worldwide view of the subject. (November 2022) |
In order to further accelerate the adoption of laser displays, the China Ministry of Science and Technology has prioritized the "engineering and development of next-generation laser display technology" as one of the eight major industrial development directions. As related technical problems are gradually resolved, the popularization of laser TV products in households remains a major goal.
At the end of December 2019, the CESI Laboratory of the China National Institute of Electronic Standardization and a team of ophthalmologists from Peking Union Medical College Hospital conducted a research project regarding the visual perception and eye strain of laser displays. In the study, 32 subjects were placed in the same environmental conditions comparing a laser TV and a LCD TV. Eye blinking frequency and the subjective perception score were compared and analyzed between the displays. The results found that watching the LCD TV for an extended period of time produced certain symptoms such as eye swelling, eye pain, photophobia, dry eyes, and blurred vision, while watching the laser TV, there was no obvious visual change or eye discomfort.[27]
On January 16, 2020, the Laser Television Industry Branch of the China Electronic Video Industry Association released the industry's first White Paper on Laser TV Eye Care in Shanghai. The white paper published the eye-care evaluation data of laser TVs and traditional
Prospect
Compared with
Technical challenges
Lasers are the most expensive components of laser televisions. More advanced laser diodes usually need more
References
- ^ German Patent 1 193 844 entitled "Optischer Sender fuer mindestens zwei Farbkomponeneten" was filed on October 26, 1963 by - and awarded on January 20, 1966 to - the German company Telefunken. Helmut K.V. Lotsch has explicitly been named the inventor.
- ^ H.K.V. Lotsch, F. Schroeter: Das Laser Farb-Fernsehen, LASER 2 (December 1977) 37-39.
- ^ "2006 Laser Projection Systems Report". Insight Media. 2006-02-02. Archived from the original on 2008-01-18.
- ^ "Big Blue Laser in a Small Package: Is it Coming Soon? - Greg Niven" (PDF). Coherent Inc. 2003-02-01. Archived from the original (PDF) on 2011-07-08. Retrieved 2008-01-11.
- ^ "Novalux Wins Insight Media "Best Buzz" Award at Consumer Electronics Show 2006". Insight Media. 2006-02-01.
- ^ "Mitsubishi Joins the Laser-TV Club". Display Daily. 2006-02-16. Archived from the original on 2008-04-06.
- ^ Marriott, Michel (2006-04-03). "Mitsubishi Harnesses Colored Lasers to Produce New-Generation Lightweight HDTV". The New York Times. Retrieved 2010-05-07.
- ^ "Laser TV Technology: Plasma and LCD Killer". Gizmodo. 2006-10-11. Retrieved 2007-01-04.
- ^ "Mitsubishi Digital Electronics America, Inc. Announces Screen Sizes for LaserVue Laser TV Shipping in Third Quarter 2008" (PDF). Mitsubishi Digital Electronics America, Inc. 2008-06-25.[permanent dead link]
- ^ "Mitsubishi Unveils Laser TV, 3-D Home Theater". technologyreview.com. 2008-01-08.
- ^ "HDTVs: Mitsubishi Laser TV's Colors Look Even Juicier Than the Girls on the Set". Gizmodo. 2008-01-08.
- ^ "Mitsubishi laser TV unveiled". Engadget. 2008-01-08.
- ^ "Color Burns Bright With Mitsubishi's Laser TV". Popular Science Blog. 2008-01-09.
- ^ "Mitsubishi Laser TV: Colors May Be Too Brilliant". Today @ PC World. 2008-01-08. Archived from the original on July 16, 2011.
- ^ "Mitsubishi announces prices for its laser-based HDTV". Bitstream. 2008-09-08. Archived from the original on 2008-09-08.
- ^ "Mitsubishi Electric LaserVue - FAQ". Mitsubishi Digital Electronics America, Inc. 2008-04-07. Archived from the original on 2009-08-28. Retrieved 2009-09-25.
- ^ "Mitsubishi Exits RPTV, Inventory Almost Gone - Mitsubishi Electric LaserVue Killed". www.twice.com. 2012-12-03. Archived from the original on 2013-05-25. Retrieved 2013-04-24.
- ^
"Mitsubishi announces prices for its laser-based HDTV". cnet. 2013-03-08.
- ^ "激光电视产业分会将举行第一次成员大会,激光电视迎来新发展_ZNDS资讯". n.znds.com (in Chinese (China)). Retrieved 6 March 2020.
- ^ "What is a Laser Video Projector?". Lifewire. Retrieved 6 March 2020.
- ^ Morrison, Geoffrey. "Why lasers are the future (of projectors)". CNET. Retrieved 6 March 2020.
- ^ "The Technology Behind the Display". Novalux. Retrieved 2007-09-04.
- ^ "LG Laser Display Specifications". LG Electronics.
- ^ Morgenstern, Steve (2007). "Laser-Sharp Color". Popular Science. 270 (1): 24.
- ^ "Understanding What A Laser Projector (Laser TV) Is". en.jmgo.com. Retrieved 6 March 2020.
- ISBN 9781315651491. Retrieved 6 December 2015.
- ^ "国家给出权威认定:激光电视最护眼". tech.sina.com.cn. 17 September 2018. Retrieved 8 March 2020.
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- ^ "DLP vs. LCD vs. LED vs. LCoS vs. Laser: Shedding Light on Projector Technology". www.electropages.com. Retrieved 8 March 2020.
- S2CID 60918786.