Field emission device

A field emission device, comprising:

• a rear substrate;
• a cathode electrode disposed on an upper surface of said rear substrate;
• at least two groups of emitters for emitting electron beams and arranged in a row extending in a first direction on an upper surface of said cathode electrode;
• a gate electrode placed on said upper surface of said cathode electrode for extracting electrons from the emitters, and including first opening portions extending in the first direction and respectively corresponding to respective ones of the emitters;
• a first insulating layer interposed between said gate electrode and said cathode electrode;
• a focus electrode placed on an upper surface of said gate electrode and including a second opening portion extending in a second direction perpendicular to said first direction and connected to the first opening portions;
• a second insulating layer interposed between said focus electrode and said gate electrode;
• a front substrate disposed a predetermined distance above said rear substrate and having an anode electrode on a lower surface thereof;
• and
• a fluorescent pattern formed on a lower surface of said anode electrode for emitting light when the electron beams collide with it, at least two groups of emitters being arranged in a row extending in the first direction;
• wherein a relatively high voltage is applied to the first opening portions and a relatively low voltage is applied to the second opening portion connected to the first opening portions, whereby a quadruple lens structure is formed;
• and
• wherein the quadruple lens structure deflects groups of electron beams emitted from each group of the emitters accommodating at least two electron beams which overlap with one another.

A field emission device, comprising:

• a rear substrate;
• a cathode electrode on said rear substrate;
• a first group of emitters for emitting electron beams and disposed in a row extending in a first direction on said cathode electrode;
• a gate electrode disposed on said cathode electrode for extracting electrons from the first group of emitters and including first opening portions extending in a second direction perpendicular to the first direction and respectively corresponding to respective emitters of the first group of emitters;
• a focus electrode placed on an upper surface of said gate electrode and including a second opening portion extending in the first direction and connected to the first opening portions of the corresponding emitters of the first group of emitters;
• an insulating layer interposed between said focus electrode and said gate electrode;
• a front substrate disposed a predetermined distance above said rear substrate and having an anode electrode disposed on said front substrate;
• and
• a fluorescent pattern formed on said anode electrode for emitting light when the electron beams collide with it.