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Encyclopedia > Field emission display

A field emission display (FED) is a type of flat panel display using phosphor coatings as the emissive medium. Flat panel displays encompass a growing number of technologies enabling video displays that are lighter and much thinner than traditional television and video displays using cathode ray tubes, usually less than 10 cm (4 inches) thick. ... A phosphor is a substance that can exhibit the phenomenon of fluorescence (glowing during absorption of radiation of another kind) or phosphorescence (sustained glowing without further stimulus). ... Phosphorescent powder under visible light, ultraviolet light, and total darkness. ...


Field emission displays are very similar to cathode ray tubes, however they are only a few millimeters thick. Instead of a single electron gun, a field emission display (FED) uses a large array of fine metal tips or carbon nanotubes (which are the most efficient electron emitters known), one positioned behind each phosphor dot, to emit electrons through a process known as field emission. A similar technology to be commercialized in 2007 is the SED (surface-conduction electron-emitter) display. Cathode ray tube employing electromagnetic focus and deflection Cutaway rendering of a color CRT Electron guns Electron beams Focusing coils Deflection coils Anode connection Mask for separating beams for red, green, and blue part of displayed image Phosphor layer with red, green, and blue zones Close-up of the phosphor... Electron gun from a cathode ray tube An electron gun is a component that produces an electron stream that has a precise kinetic energy, being used in all TVs and monitors which use cathode ray tube technology, and in other instruments, eg. ... An electronic device known as a diode can be formed by joining two nanoscale carbon tubes with different electronic properties. ... Also known as Fowler-Nordheim tunneling, field emission is a form of quantum tunneling in which electrons pass through a barrier in the presence of a high electric field. ... A Surface-conduction Electron-emitter Display (SED) is a flat panel display technology that uses surface conduction electron emitters for every individual display pixel. ...


Like LCDs, FEDs are energy efficient and could provide a flat panel technology that features less power consumption than existing LCD and plasma display technologies. They can also be cheaper to make, as they have fewer total components. As of yet, however, there are no consumer production models available in the United States, although small demo panels have been produced. LCD redirects here. ... A plasma display (a. ...


In 2001, Candescent had spent $600 million on producing FEDs with non-carbon material, but it was abandoned, with assets sold to Canon in August 2004, two months after filing for voluntary reorganization under Chapter 11. Advance Nanotech, in collaboration with the University of Bristol, has developed a similar panel that relies on specially doped diamond dust. Carbon Nanotechnologies claimed production would start in late 2006.


Potential advantages

  • For gamers; game consoles with light guns may be able to react to the object that emits the sufficient lighting dynamics on the screen like on conventional CRTs which emit a flexible range of light dynamics; whereas, an LCD flat-panel monitor will only produce color and illuminate it with a backlight.
  • Unlike LCD displays, the FED may have flexible handling of oddball resolutions that LCDs will emulate poorly due to their native resolutions.

The Nintendo GameCube is an example of a popular video game console. ... A light gun is a pointing device for computers and a control device for arcade and video games. ... CRT can mean: Cathode Ray Tube, in electronics, a display device (such as those used in one type of television) C Run-Time, in computing Charitable Remainder Trust, in Law Chinese Remainder Theorem, in mathematics Corneal Refractive Therapy, in medicine Criterion-referenced test, in U.S. schools Critical race theory... LCD redirects here. ... Backlights are lights that are attached to LCD displays so that they can be seen at night. ... LCD redirects here. ... It has been suggested that this article or section be merged into Liquid crystal display. ...

External links


  Results from FactBites:
 
U.S. Patent: 6228667 - Field emission displays with reduced light leakage - May 8, 2001 (3338 words)
Field emission displays use electron emission from an emitter to illuminate a screen which displays a corresponding image for the user.
In field emission displays it is desirable to align the extractor or grid to the emitter.
Ideally, the field emission display 10 is controlled by the conducting state of the transistor 20 as controlled by its gate bias.
  More results at FactBites »

 
 

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