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US 7,548,018 B2Granted
Electron emission device with a grid electrode for focusing electron beams
AssigneeSamsung SDI Co., Ltd.
InventorSeung-Hyun Lee
Life of this patent
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Abstract
An electron emission device includes first and second substrates facing each other while a vacuum space is interposed therebetween. An electron emission array is formed on the first substrate to emit electrons toward the second substrate, and phosphor layers are formed on the second substrate. An anode electrode is formed on a surface of the phosphor layers, and receives the voltage required for accelerating electron beams from the electron emission array. A grid electrode is disposed between the first and second substrates and is closer to the second substrate than to the first substrate. The grid electrode has electron beam passage holes, and receives a voltage lower than a location reference voltage.
Claims13
An electron emission device comprising:
- first and second substrates facing each other and having a vacuum space interposed therebetween;
- an electron emission array formed on the first substrate to emit electrons toward the second substrate;
- a plurality of phosphor layers formed on the second substrate;
- an anode electrode formed on a surface of the phosphor layers and receiving a voltage required for accelerating electron beams from the electron emission array;
- and
- a grid electrode disposed between the first and second substrates, the grid electrode being closer to the second substrate than to the first substrate, the grid electrode having a plurality of electron beam passage holes, and receiving a voltage lower than a location reference voltage at the location of the grid electrode due to a voltage applied to the electron emission array and the voltage applied to the anode electrode,
- wherein the grid electrode has a plurality of electron beam passage holes for each of a plurality of electron emission regions of the electron emission array, and
- wherein the grid electrode satisfies the following condition:
- d≦3t
- where d indicates a distance between the grid electrode and the anode electrode, and t indicates a thickness of the grid electrode.
7 more elements
An electron emission device comprising:
- first and second substrates facing each other and having a vacuum space interposed therebetween;
- an electron emission array having a plurality of cathode electrodes formed on the first substrate, a plurality of electron emission regions electrically connected to the cathode electrodes to emit electrons toward the second substrate, and a plurality of gate electrodes insulated from the cathode electrodes;
- a plurality of phosphor layers formed on the second substrate;
- an anode electrode formed on a surface of the phosphor layers and receiving a voltage required for accelerating electron beams from the electron emission regions;
- and
- a grid electrode disposed between the first and second substrates and having a plurality of electron beam passage holes;
- wherein the grid electrode is placed closer to the second substrate than to the first substrate to reduce an over-focused effect, and
- wherein the grid electrode receives a medium-level voltage, the medium-level voltage being lower than a location reference voltage at the location of the grid electrode due to a voltage applied to at least one of the cathode electrodes and the voltage applied to the anode electrode to reduce an influential force of an electric field of the anode electrode to the electron emission regions,
- wherein the grid electrode has a plurality of electron beam passage holes for each of a plurality of electron emission regions of the electron emission array, and
- wherein the grid electrode satisfies the following condition:
- d≦3t
- where d indicates a distance between the grid electrode and the anode electrode, and t indicates a thickness of the grid electrode. ,
9 more elements
An electron emission device comprising:
- first and second substrates facing each other and having a vacuum space interposed therebetween;
- an electron emission array formed on the first substrate to emit electrons toward the second substrate;
- a plurality of phosphor layers formed on the second substrate;
- an anode electrode formed on a surface of the phosphor layers and receiving a voltage required for accelerating electron beams from the electron emission array;
- and
- a grid electrode disposed between the first and second substrates, the grid electrode being closer to the second substrate than to the first substrate, the grid electrode having a plurality of electron beam passage holes, and receiving a voltage lower than a location reference voltage at the location of the grid electrode due to a voltage applied to the electron emission array and the voltage applied to the anode electrode,
- wherein the grid electrode satisfies the following condition to inhibit over-focusing of the electrons emitted from the electron emission array and passing through the grid electrode:
- d≦3t
- where d indicates a distance between the grid electrode and the anode electrode, and t indicates a thickness of the grid electrode.
6 more elements
Dependencies are inferred from the claim text.