Field-Emission Displays (FEDs)

Vacuum displays which operate similarly to CRTs

• cold emission of electrons from cathodes

  • a matrix array of metal or Si microtips (small, sharp cones)
    • >ᡂ microtips/pixel => redundancy and reliability
  • thin film diamond cathode

• electrons accelerated through a grid to the anode

  • activate phosphors at the anode to produce light

• anode voltage: few hundred volts or several kV

• passive-matrix addressed

  • diode, triode, or tetrode vacuum tubes

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