Canon - CNT Display - USP 7,419,416

Canon - CNT Display

United States Patent 7,419,416
Tsukamoto September 2, 2008

Electron emission element, electron source, image display device, and method of manufacturing the same

Abstract

A method of manufacturing an electron emission element, including forming common wire electrodes (signal lines) (4a, 4b) on a substrate (1) and forming electron emission units including fibrous material assemblies (6a, 6b) on the common wire electrodes (4a, 4b), respectively, for preventing abnormal discharge caused by an antistatic film (7) with no deterioration in characteristics of the electron emission element. The electrode forming is followed by forming resist patterns (40a, 40b) covering at least part of the common wire electrodes (4a, 4b) before the antistatic film is formed. Thereafter the resist patterns (40a, 40b) on the common wire electrodes (4a, 4b) are removed together with the antistatic film (7) before the electron emission unit is formed, so that the electron emission units made of the fibrous material assemblies (6a, 6b) are formed on the common wire electrodes (4a, 4b) from which the resist patterns (40a, 40b) have been removed.

Inventors: Tsukamoto; Takeo (Atsugi, JP)

Assignee: Canon Kabushiki Kaisha (Tokyo, JP)

Appl. No.: 11/021,473
Filed: December 23, 2004
Foreign Application Priority Data
Dec 26, 2003 [JP] 2003-432500

According to a first aspect of the present invention, preferably the fibrous material is a carbon nano-tube or a graphite nanofiber.
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(6) By using printing paste material containing the fibrous material (carbon nano-tubes in this embodiment) and properly containing organic material, inorganic material, and photosensitive organic material, the fibrous material assemblies 6a and 6b that are electron emission units are formed by printing on a part of the common wire electrodes (signal lines) 4a and 4b, respectively. Thereafter, they are precisely shaped by photolithography using light transmitted from a rear face of the substrate 1.

Source

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

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

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

Abstract

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.

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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.

Source