A spray with carbon nanotubes and a method for spraying the spray to get an electron emitting source layer are provided. Choosing a proper and vaporizable solvent to disperse and suspend the carbon nanotubes scattered therein. To mixed up the carbon nanotubes with a binder or an additive to be the spray with a low viscosity. The solvent mixed is carried with a high-pressure air to spray uniformly on a negative conductive layer or a negative glass substrate, a thickness of a film sprayed by the solvent mixed can be adjusted and controlled by a spraying frequency thereof, and the film can be even and uniform and the carbon nanotubes can expose out easily to generate electrons and increase current density thereby in the spraying manner.

A manufacturing method for an electron-emitting source of triode structure, including forming a cathode layer on a substrate, forming a dielectric layer on the cathode layer, and positioning an opening in the dielectric layer to expose the cathode layer, wherein the opening has a surrounding region, forming a gate layer on the dielectric layer, except on the surrounding region, forming a hydrophilic layer in the opening, forming a hydrophobic layer on the gate layer and the surrounding region, wherein the hydrophobic layer contacts the ends of the hydrophilic layer, dispersing a carbon nanotube solution on the hydrophilic layer using ink jet printing, executing a thermal process step, and removing the hydrophobic layer. According to this method, carbon nanotubes are deposited over a large area in the gate hole.

A preferred method for making a field emission device (100) includes the steps of: providing an insulative substrate (101) with a surface (1011); defining a plurality of recesses (1012) in a desired pattern in the substrate; forming a cathode layer (104) in the recesses; forming a plurality of electron emitters (106) on the cathode; and forming a grid (111) on the surface of the substrate, such that the grid is insulated from the cathode.

A display device has an array formed on a substrate including a cathode wiring line layer, a gate wiring line layer and an insulating layer for electrically insulating the cathode wiring line layer and the gate wiring line layer from each other. Holes are formed at the crossing portion between the cathode wiring line layer and the gate wiring line layer so as to penetrate through the insulating layer, and resistive layer and an emitter layer are provided in the holes. The resistive layer has such a structure that conductive fine particles are dispersed in a base material of insulating fine particles, and the emitter layer is formed of a fine particle material. The insulating layer between the cathode electrode lines and the gate electrodes is formed of a silicon oxide film containing fluorine. When a large number of elements are formed over a large area in an electron emission device using fine particle emitters, there can be provided electron emission elements which can suppress the unevenness of the electron emission amount. According to the present invention, there can be provided a large-area and uniform display device which can be operated with a low driving voltage, and have a long lifetime.

A method of manufacturing an electron-emitting device having excellent electron emission characteristics is provided in which fibers comprising carbon as the main composition are fixed (bonded) to a substrate in a desired area and at a desired density with simple processes and inexpensive manufacture cost, and a manufacture method for an electron source, a light-emitting apparatus and an image forming apparatus using such electron-emitting devices is provided. A method of manufacturing an electron-emitting device made of material comprising carbon as main composition by an aerosol type gas deposition method in which the material comprising carbon as the main composition is aerosolized and transported together with gas, and tightly attached (bonded) to a substrate via a nozzle.