Field emission display (FED)
A field emission display (FED) is a low power, flat cathode ray tube type display that uses a matrix-addressed cold cathode to produce light from a screen coated with phosphor materials. Field emission display is a high-voltage display with a triode structure consisting of anode, cathode, and gate electrodes to achieve high illumination by applying a high voltage and a low current. The field emission display utilizes substantially the same physical principle as the CRT. Unlike CRTs, FEDs rely on electric field or voltage induced, rather than temperature induced, emissions to excite the phosphors by electron bombardment. To produce these emissions, FEDs have generally used a multiplicity of x-y addressable cold cathode emitters. A field emission display has a triode structure with a cathode electrode, an anode, and gate electrode. The field emission display is constructed such that the cathode electrode is formed on a substrate on which the electron emission source is placed and an insulating layer and the gate electrode are formed on the cathode electrode. A field emission display forms images using cold cathode electrons as an electron emission source. In the field emission display, a strong electric field is formed between a field emitter and gate electrodes disposed on a cathode at a constant interval, so that electrons are emitted from the field emitter so as to impact on phosphors of an anode, thereby emitting light. The quality of the field emission display depends on characteristics of the electron emission source, such as the material and the structure of the electron emission source. The overall quality of the FED depends on the characteristics of emitters, which form an electron emitting layer. Field emission display has advantages of light weight and thin profile, like liquid crystal display (LCD), and advantages of high brightness and self luminescence, like cathode ray tube (CRT). FEDs are generally energy efficient since they are electrostatic devices that require no heat or energy when they are off. When they operate, nearly all of the emitted electron energy is dissipated on phosphor bombardment and the creation of emitted unfiltered visible light.
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