Tuesday, June 10, 2008

United States Patent 7,375,366, Sharp, CNT Display

United States Patent 7,375,366
Ohki , et al. May 20, 2008

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


A carbon nanotube has a carbon network film of polycrystalline structure divided into crystal regions along the axis of the tube, and the length along the tube axis of each crystal region preferably ranges from 3 to 6 nm. An electron source includes a carbon nanotube having a cylindrical shape and the end of which on the substrate side is closed and disposed in a fine hole. The end on the substrate side of the tube is firmly adhered to the substrate. The carbon nanotube is produced by a method in which carbon is deposited under the condition that no metal catalyst is present in the fine hole and produced by a method in which after the carbon deposition the end of the carbon deposition film is modified by etching the carbon deposition film using a plasma. Therefore, an electron source excellent in the evenness of field emission characteristics in a field emission region (pixel) in the device plane and driven with low voltage can be provided, and a display operated with ultralow power consumption exhibiting ultrahigh luminance can be provided.

Inventors: Ohki; Hiroshi (Tokyo, JP), Tsunesada; Tsunaki (Suita, JP), Urayama; Masao (Tenri, JP), Kyotani; Takashi (Natori, JP), Matsui; Keitarou (Sendai, JP), Tomita; Akira (Sendai, JP)
Assignee: Sharp Kabushiki Kaisha (Osaka-shi, Osaka, JP)
Appl. No.: 10/204,670
Filed: February 22, 2001
PCT Filed: February 22, 2001
PCT No.: PCT/JP01/01326
371(c)(1),(2),(4) Date: December 12, 2002
PCT Pub. No.: WO01/62665
PCT Pub. Date: August 30, 2001

What is claimed is:

1. 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, and wherein an end face of the cabon network film is modified such that field emission efficiency is increased.


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