Carbon nanotube and method for producing the same, electron source and method for producing the same, and display

A display comprising:

• an electron source which includes a plurality of carbon nanotubes as a field emission part;
• and
• electric field applying means for applying an electric field to each carbon nanotube so as to cause each carbon nanotube to emit electrons,
• wherein:
• each carbon nanotube is at least one layer of a cylindrical carbon network film, and
• the carbon network film has a polycrystal structure which is divided into a plurality of crystal areas in a tube axis direction.

A producing method of an electron source which includes a carbon nanotube as a field emission part, and a support member for supporting the carbon nanotube,

• said method comprising the steps of:
• forming the support member using a porous material with large numbers of pores;
• and
• depositing carbon in the pores of the porous material in the absence of a metal catalyst in the pores, so as to form a carbon deposition film of a cylindrical shape.

A producing method of an electron source which includes a carbon nanotube as a field emission part, and a support member for supporting the carbon nanotube,

• said method comprising the steps of:
• forming the support member using a porous material with large numbers of pores;
• and
• forming a carbon deposition film of a cylindrical shape by depositing carbon in the pores of the porous material, and plasma etching the carbon deposition film so as to modify a tip of the carbon deposition film.

A display comprising:

• an electron source which includes a plurality of carbon nanotubes as a field emission part;
• and
• electric field applying means for applying an electric field to each carbon nanotube so as to cause each carbon nanotube to emit electrons,
• said display further comprising:
• particles, dispersed between the carbon nanotubes, that bind side surfaces of the carbon nanotubes adjacent to one another.

A display comprising:

• an electron source, which includes a plurality of carbon nanotubes as a field emission part and a support member for supporting each carbon nanotube;
• and
• electric field applying means for applying an electric field to each carbon nanotube so as to cause each carbon nanotube to emit electrons,
• wherein:
• the support member is a porous layer, formed on a substrate, having large numbers of through-pores, and
• each carbon nanotube is formed in a cylindrical shape inside the pores so that one end of the carbon nanotube is closed on the side of the substrate and an end face of the carbon nanotube on the side of the substrate adheres to a surface of the substrate.

A display comprising:

• an electron source, which includes a plurality of carbon nanotubes as a field emission part and a support member for supporting each carbon nanotube;
• and
• electric field applying means for applying an electric field to each carbon nanotube so as to cause each carbon nanotube to emit electrons,
• wherein:
• the support member is a porous material with large numbers of pores, and
• each carbon nanotube is bonded at least partially to an inner wall of the pores.

A display comprising:

• an electron source, which includes a plurality of carbon nanotubes as a field emission part and a support member for supporting each carbon nanotube;
• and
• electric field applying means for applying an electric field to each carbon nanotube so as to cause each carbon nanotube to emit electrons,
• wherein:
• an emission start electric field intensity of the electron source is in a range of from 0.25 V/μm to 0.5 V/μm.

A display comprising:

• an electron source which includes a plurality of carbon nanotubes as a field emission part;
• and
• electric field applying means for applying an electric field to each carbon nanotube so as to cause each carbon nanotube to emit electrons,
• wherein an emission current density of the electron source when an electric field with an electric field intensity of 1 V/μm is applied is in a range of from 10 mA/cm2 to 100 mA/cm2.

A producing method of an electron source which includes a carbon nanotube as a field emission part and a base substrate for supporting the carbon nanotube,

• said method comprising the steps of:
• forming on the base substrate a base layer made of an oxidizable base material;
• forming a porous layer with large numbers of pores by causing the base layer to undergo anodic oxidation;
• forming the carbon nanotube inside the pores;
• and
• forming on the base substrate an anodic oxidation stopping layer for stopping anodic oxidation of the base substrate, before the base layer undergoes anodic oxidation.

A producing method of an electron source which uses a carbon nanotube, comprising the steps of:

• forming a cathode electrode wiring on a substrate;
• forming a high resistor layer on the cathode electrode wiring;
• forming an inorganic material thin film in a field emission area on the high resistor layer;
• forming pores through the inorganic material thin film;
• disposing the carbon nanotube inside the pores;
• and
• modifying a surface of the carbon nanotube.

A producing method of an electron source which includes a carbon nanotube as a field emission part and a support member for supporting the carbon nanotube,

• said method comprising the steps of:
• forming the support member with a porous material having large numbers of pores;
• and
• depositing carbon inside the pores of the porous material in the absence of a metal catalyst in the pores, so as to form a carbon deposition film of a cylindrical shape.

A producing method of a carbon nanotube in which carbon is deposited in pores of a porous material having large numbers of pores so as to form a carbon deposition film of a cylindrical shape,

• said method comprising:
• an anodic oxidation step for obtaining the porous material;
• and
• a heating step of not less than 600° C. after the anodic oxidation step.