A field emission gun consists of a sharply pointed tungsten tip held at several kilovolts negative potential relative to a nearby electrode, so that there is a very high potential gradient at the surface of the tungsten. OMG I LOVE LAZERS PEW PEW!! General Name, Symbol, Number tungsten, W, 74 Chemical series transition metals Group, Period, Block 6, 6, d Appearance grayish white, lustrous Atomic mass 183. ... It has been suggested that this article or section be merged with Scalar potential. ... An electrode is a conductor used to make contact with a nonmetallic part of a circuit (e. ... Horizontal line (use sparingly)d grade for the grade or gradient of roads and other geographic features. ...
Fieldemission displays are very similar to cathode ray tubes, however they are only a few millimeters thick.
Instead of a single electron gun, a fieldemission 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 fieldemission.
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.
From 1998 on, the perspective to use nanotubes as fieldemission devices spurred efforts worldwide: a first crude display as well as a lighting element were presented.
Standard fieldemission model from a metallic emitter, showing the potential barrier and the corresponding energy distribution (energy on the vertical axis, current on the horizontal logarithmic axis).
Typical set-up for fieldemission: a potential difference is applied between a nanotube (or an assembly of nanotubes) and a counterelectrode.
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