Field emission unit and field emission pixel tube

Technical Field

The invention relates to a field emission unit and field emission pixel tube.

Background Art

Carbon nanotube (  Nanotube Carbon, CNT) is a novel carbon material, by Japanese researchers in Iijima 1991 years found, please refer to "  Carbon   Microtubules   Graphitic Helical   of", S. Iijima, Nature, vol. 354, p56 (1991). The carbon nanotube has an extremely large length-to-diameter ratio (its length, in the micron level above, diameter only a few nanometer or dozens of nanometer), has good conductive thermal conductivity, and also has very good mechanical strength and good chemical stability, these characteristics causes the carbon nanotubes to become a good field emission material. Therefore, the carbon nanotube field emission device of the present application in the field of nanotechnology has become a research hot.

However, existing field transmitting unit and field emission pixel pipe is carbon nomo pipeline or aggregation of the carbon nanotube as an electron emitter, the electron emitter in the carbon nanotube as an electron emission source together, bad heat dissipation in the working process, and adjacent ones of the carbon nano-tube exists between the shielding effect of the electric field, therefore the electron emitter electron emission capability is not good enough.

Content of the invention

In view of this, it is necessary to provide a relatively strong electron emission capacity field emission unit and field emission pixel tube.

A field emission unit, which comprises a fluorescent powder layer and an anode, the anode comprises an end surface, the phosphor layer is provided on the end surface in the anode, a cathode, the cathode and the anode are arranged at intervals, the cathode comprises a cathode support body and an electron emitter, the electron emitter is connected with the cathode is electrically connected with the supporting body, wherein the electron emitter comprises a carbon nanotube tubular structure, said carbon nanotube one end of the tubular structure and said cathode is connected with the supporting body, the carbon nanotube at the other end of the tubular structure extending to the anode as an electronic emitter electronic transmitting end, the carbon nano-tube tubular structure is a plurality of carbon nanotubes around a hollow linear axis, the electron emitter comprises a carbon nanotube tubular structure, said carbon nanotube one end of the tubular structure and said cathode is connected with the supporting body, the carbon nanotube at the other end of the tubular structure extending to the anode as an electronic emitter electronic transmitting end, the carbon nano-tube tubular structure is a plurality of carbon nanotubes around a hollow linear axis, the electron emission end is provided with an opening, the carbon nanotube extends from the opening of the tubular structure a plurality of carbon nano-tube bundle as a plurality of electron emission tips.

A field emission pixel pipe, the pipe comprising a shell and a transmitting unit, the field emission unit is provided in the shell, the field the transmission unit includes a phosphor powder layer and an anode, the cathode and the anode are arranged at intervals, the anode comprises an end surface, the phosphor layer is provided on the end surface in the anode, a cathode, the cathode comprises a cathode support body and an electron emitter, the electron emitter is connected with the cathode is electrically connected with the supporting body, wherein the electron emitter comprises a carbon nanotube tubular structure, said carbon nanotube one end of the tubular structure and said cathode is connected with the supporting body, the carbon nanotube to the other end of the tubular structure to the anode used as electron emitter electronic transmitting end, the carbon nano-tube tubular structure is a plurality of carbon nanotubes around a hollow linear axis, the electron emitter comprises a carbon nanotube tubular structure, said carbon nanotube one end of the tubular structure and said cathode is connected with the supporting body, the carbon nanotube at the other end of the tubular structure extending to the anode as an electronic emitter electronic transmitting end, the carbon nano-tube tubular structure is a plurality of carbon nanotubes around a hollow linear axis, the electron emission end is provided with an opening, the carbon nanotube extends from the opening of the tubular structure a plurality of carbon nano-tube bundle as a plurality of electron emission tips.

A field emission pixel pipe, which comprises a shell, and a plurality of field emission unit, the plurality of field emission unit arranged in the shell at intervals, the plurality of field emission unit in a linear arrangement or in a certain array, each of said field emission unit includes a phosphor powder layer and an anode, the anode comprises an end surface, the phosphor layer is provided on the end surface in the anode, a cathode, the cathode and the anode are arranged at intervals, the cathode comprises a cathode support body and an electron emitter, the electron emitter is connected with the cathode is electrically connected with the supporting body, wherein the electron emitter comprises a carbon nanotube tubular structure, said carbon nanotube one end of the tubular structure and said cathode is connected with the supporting body, the carbon nanotube at the other end of the tubular structure extending to the anode as an electronic emitter electronic transmitting end, the carbon nano-tube tubular structure is a plurality of carbon nanotubes around a hollow linear axis, the electron emitter comprises a carbon nanotube tubular structure, said carbon nanotube one end of the tubular structure and said cathode is connected with the supporting body, the carbon nanotube at the other end of the tubular structure extending to the anode as an electronic emitter electronic transmitting end, the carbon nano-tube tubular structure is a plurality of carbon nanotubes around a hollow linear axis, the electron emission end is provided with an opening, the carbon nanotube extends from the opening of the tubular structure a plurality of carbon nano-tube bundle as a plurality of electron emission tips.

Compared with the prior art, the present invention the field emitting unit and field emission pixel tube of the electron emitter is a carbon nanotube tubular structure, can improve the mechanical strength of the electron emitter, the electron emitter heat dissipation capacity, and the carbon nano-tube tubular structure further includes a plurality of electron emission tips of the ring arrangement, can effectively reduce a plurality of electron emitting tip of the shielding effect of the between, the electron emitters are the electron-emitting ability, thereby increasing the emission current density of the electron emitters.

Description of drawings

Figure 1 is a structure diagram of the invention 1st embodiment provides field emission pixel tube.

Figure 2 is a structure diagram of the invention 1st embodiment provides field emission pixel tube electron emitter.

Figure 3 is a schematic diagram of cross-section provided by the embodiment of the invention 1st field emission pixel tube electron emitter.

Figure 4 is provided by the embodiment of the invention 1st field emission pixel tube electron emitter the scanning electron microscope photo.

Fig. 5 is provided by the embodiment of the invention 1st field emission pixel tube electron emitter necking the scanning electron microscope photo.

Figure 6 is provided by the embodiment of the invention 1st field emission pixel tube electron emitter plurality of electron-emitting state-of-the-art scanning electron microscope photo.

Figure 7 is the 1st embodiment of the present invention to provide a field emission pixel tube electron emission state-of-the-art transmission electron microscope photo.

Figure 8 is a schematic diagram of cross-section provided by the embodiment of the invention 1st field emission pixel tube electronic emitter and its linear supporting body.

Figure 9 the invention 1st is provided by the embodiment of the carbon nanotube field emission pixel tube scanning electron microscope photographs of the tubular structure.

Figure 10 is a structure diagram of the invention 1st has provided by the embodiment of a grating body field emission pixel tube.

Figure 11 is a structure diagram of the present invention provided by the embodiment of the 2nd field emission pixel tube.

Figure 12 to Figure 15 is a schematic diagram of the position relationship 2nd embodiment of the present invention to provide a field emission pixel tube electron emitter and the anode.

Figure 16 is a structure diagram of the present invention provided by the embodiment of the 3rd field emission pixel tube.

Figure 17 is a structure diagram of the present invention provided by the embodiment of the 4th field emission pixel tube.

Figure 18 is a schematic diagram of -4th embodiment of the present invention to provide a field emission pixel tube.

Note the main component symbols

Mode of execution

The following will be made of this invention illustrated in the Figure further detailed description.

Please refer to fig. 1, 1st embodiment of the present invention to provide a field emission pixel pipe 100, the field emission pixel tube 100 includes a housing 102 and a field emission unit (Figure not marked), the field emitting unit is located in the casing 102 in, the housing 102 for the field emission unit provides a vacuum space.

The field emitting unit comprises a cathode 104, a phosphor powder layer 110, a positive pole 112 and a cathode lead 116 and a positive pole lead wire 114. The cathode 104 of the anode 112 and arranged at intervals relative to, the cathode lead 116 and the cathode 104 is electrically connected with, the anode lead wire 114 and the anode 112 is electrically connected with, the cathode 104 can emit electrons, the emitted electrons in the cathode 104 of the anode 112 under the action of electric field generated between the reach the phosphor layer 110, bombarding the phosphor layer 110 and the fluorescent material in the light-emitting.

The housing 102 of the hollow structure is vacuum sealed. In this embodiment, the housing 102 is hollow cylinder, and the housing 102 material is quartz or glass. Understandably, the housing 102 can also be a hollow cube, triangular prism or other polygonal prism. The housing 102 has two opposite end faces (not marked), one of the sections has an end face 124, the emergent part 124 can be a plane also can be spherical or non-spherical, the technicians of this field can be selected according to the actual situation. Can be understood, the emergent part 124 can also be provided in the housing 102 of the entire surface. The anode 112 is arranged in the housing 102 is provided with a light 124 on the inner wall of, the anode 112 as the indium tin oxide film or aluminum film, it has good transparency to light and conductivity. The anode 112 through the anode lead 114 is electrically connected with the shell 102 external.

The phosphor layer 110 is arranged in the anode 112 close to the cathode 104 of the surface, the fluorescent powder layer 110 can be a white phosphor powder, can also be a colored phosphor powder, for example red, green, blue fluorescent powder, , when the electronic bombardment of the phosphor layer 110 can be made white or color visible light.

The cathode 104 is arranged on the shell 102 and the optical part 124 and an opposite end of the perpendicular to the axis of the emergent part 124. The cathode 104 includes a female electrode support body 106 and an electronic emitter 108. The electron emitter 108 is connected with the cathode support body 106 is electrically connected with, the other end to the anode 112 extending as an electronic transmitting terminal 122, used the emission of electrons, the electron emitter 108 through the conductive adhesives and the like can be fixed on the cathode support body 106 close to the phosphor layer 110 one end of. The cathode support body 106 away from the phosphor layer 110 through one end of the cathode lead 116 is electrically connected to the shell 102 external. The cathode support body 106 is a can be conductive, heat-conducting and has a certain strength of the wire or other conductive structure, in this embodiment, the cathode support body 106 is a copper wire.

Please refer to fig. 2 to fig. 4, the electron emitter 108 by a plurality of carbon nanotube comprises a carbon nanotube surrounded by the tubular structure, said carbon nanotube tubular structure having a hollow linear axis. The carbon nano-tube tubular structure through a plurality of carbon nanotubes in van der Waals force is connected with each other into an integrated structure. The carbon nanotube in the tubular structure around the hollow of the majority of the carbon nanotube extends spirally linear axis, can be understood, the carbon nanotube in the tubular structure there are also very few and non-around the linear axis of the spiral and is a random array of carbon nanotube, the carbon nanotube of the minority of random arrangement in the extending direction of the no rules. However, the small number of random arrangement of the carbon nanotubes of the carbon nanotube does not affect the manner of the tubular structure and arranged in the extending direction of the carbon nanotube. In this, the length direction of the linear axis is defined as the extending direction of the plurality of carbon nanotube, a plurality of carbon nanotube states the striation formed around the spiral axis is defined as the direction of the spiral direction. Adjacent to the spiral direction of the first end of the carbon nanotube is connected through the van der Waals force, adjacent to the extending direction of the carbon nanotube of closely through the van der Waals force. Most of the carbon nanotubes of the carbon nanotube in the tubular structure of the spiral direction and the length direction of the linear axis to form a certain cross-angle α, and < α ≤ 90° 0 °.

The linear axis is empty, is virtual. The tubular structure of the carbon nanotube in the shape of the cross section of the linear axis can be square, trapezoidal, circular or oval, cross-sectional size of the axis of the linear, can be prepared according to the actual requirements.

Please also refer to fig. 5 to fig. 7, the carbon nano-tube one end of the tubular structure has a plurality of electron emission tip 101, the plurality of electronic emitter tip 101 states the striation around the axis are arranged in the ring shape. Specifically, the carbon nanotube along striation of the axis of the tubular structure comprises a 1st end direction 103 and with the 1st end 103 opposite the end of the 2nd 105. The 1st end of the tubular structure the carbon nanotube 103 and the cathode support body 106 is electrically connected. The end of the 2nd 105 as the electron emitter 108 electronic transmitting terminal 122, the electronic transmitting terminal 122, the carbon nanotube the diameter of the tubular structure along the far away from the end of the 1st 103 is gradually reduced in the direction of, and form a necking of a cone, forming an electronic transmission part 126, i.e. the carbon nanotube in the electron emission end of the tubular structure 122 has a conical electron emission part 126. The electronic part of the tubular structure of carbon nanotube 126 is provided with an opening at the tail end of 107, and a plurality of salient carbon nanotube bundle. Wherein each carbon nano-tube bundle from the opening of the tubular structure for the carbon nanotube 107 is composed of a plurality of extended by the carbon nano tube bundle type structure. The plurality of carbon nanotube bundle states the striation axis are arranged around the ring, and to the positive pole 112 extend as a plurality of the electronic emitter tip 101. The plurality of electronic emitter tip 101 is basically the same in an extending direction, that is, the plurality of electronic emitter tip 101 states the striation substantially along the direction of the axis extending the length of the distance, refer to the distance away from the cathode support body 106 direction. Furthermore, the plurality of electronic emitter tip 101 states the striation diverges around the axis are arranged, that is, the plurality of electronic emitter tip 101 gradually away from the extending direction of the linear axis. When the plurality of carbon nanotube bundles when diverges, the electronic emission part 126 although the radial dimension of the carbon nanotube is of the tubular structure along the far away from the end of the 1st 103 is gradually reduced in the direction, but because a plurality of electronic emitter tip 101 is the arrangement of the colors, and then electronic transmission part 126 slightly outward the end of the expansion, thereby the plurality of electronic emitter tip 101 along the extending direction of the distance between the gradually becomes large, so that around the opening 107 annular arrangement a plurality of electron emitter tip 101 large distance between each other, and then further reducing the electronic emitter tip 101 the shielding effect of the between. The opening 107 is in the size range 4-6 micron, in this embodiment, the opening 107 is circular, its diameter is 5 microns, therefore the opening 107 of the two opposite ends of the electronic emitter tip 101 is more than or equal to the interval of 5 microns.

Please refer to fig. 7, each electronic emitter tip 101 includes a plurality of carbon nanotube substantially in parallel, and each electronic emitter tip 101 is provided with a protrusion at the top end of the carbon nanotube, the carbon nanotube of a plurality of parallel-arranged to highlight a carbon nanotube, preferred, each electronic emitter tip 101 a central position of a carbon nanotube, the carbon nanotube is smaller than the diameter of the 5 nanometer. In this embodiment the diameter of the protrusion of the carbon nanotube 4 nanometer. Adjacent electronic emitter tip 101 in the distance between the carbon nanotube to 0.1 microns to 2 microns. Adjacent electronic emitter tip 101 in the distance between the carbon nanotubes of the carbon nanotube with the proportion of the range of the diameter of the 20:1-500:1. Can be understood, because the electronic emitter tip 101 a at the top end of a carbon nanotube, and adjacent electronic emitter tip 101 of the distance between the carbon nanotube the diameter of the carbon nanotube is greater than a ratio of 20:1, so the adjacent electronic emitter tip 101 projecting in the space between the carbon nanotubes of the carbon nanotube is far greater than the diameter of the stress, thus effectively lowering between adjacent of the shielding effect of the carbon nanotube. Furthermore, because the plurality of electronic emitter tip 101 takes the form of ring arranged on one end of the tubular structure of carbon nanotube, and adjacent electronic emitter tip 101 of the carbon nanotube in the distance between the of the minimum value is 0.1 micron, then the plurality of electronic emitter tip 101 of any two of the distance between the carbon nanotube is greater than 0.1 micron. In this way, we can further reduce the electron emitter electric field shielding effect, obtained with a larger density of the field emission current.

Furthermore, the cathode 104 can further include a plurality of electron emitters 108 and a cathode support body 106 is electrically connected with, the plurality of electron emitters 108 are arranged at intervals to each other, the plurality of electron emitter 108 with one end of the cathode supporting body 106 is electrically connected with, the plurality of electron emitters 108 are respectively the other end to the positive pole 112 extending in the direction of.

The carbon nano-tube tubular structure is composed of at least one carbon nanotube film or at least one powder of around the linear axis formed to closely surround the shaft. Can be understood, the carbon nano-tube wall of the tubular structure with a certain thickness, the thickness of the carbon nanotube can be controlled by controlling the number of layers of the film, or a carbon nanotube of the pipeline is determined. The carbon nanotube the tubular structure the size of the inner diameter and an outer diameter can be prepared according to the actual demand, the inner diameter of the carbon nanotube can be of the tubular structure 10 microns -30 microns, the outer diameter is 15 micron -60 micron, in this embodiment, the inner diameter of the tubular structure of the carbon nanotube is about 18 microns, the maximum outer diameter of the tubular structure is the maximum diameter of the carbon nanotube is about 50 microns.

Please refer to the fig. 8, the electron emitters 108 can further include a linear support body 128 is arranged in the hollow of the tubular structure of carbon nanotube of the linear axis. The carbon nano-tube tubular structure through the linear support body 128 supporting and electrically connected with the cathode support. The carbon nano-tube tubular structure is arranged in the linear support body 128 of the surface of the carbon nano tube, i.e. the carbon nanotube layer is set and the support body states the striation 128 surface, the carbon nanotube layer with the states the striation support body 128 to form a carbon nanotube composite linear structure. The carbon nanotube composite linear structure of the carbon nanotube layer with the above-mentioned carbon nanotube on the whole of the tubular structure is basically the same, i.e. the carbon nanotube layer with the above-mentioned carbon nanotube the same structure of the tubular structure, the arrangement of the carbon nanotubes in the carbon nanotube layer with the above-mentioned carbon nanotubes and nanotube in the tubular structure and extending in the same manner as the arrangement of. The supporting body states the striation 128 can be a conductor or non-conductor, its diameter can be 10 microns -30 microns, the supporting body states the striation 128 can further improve the electron emitter 108 mechanical strength. The carbon nanotube composite linear structure with said one end of the cathode supporting body 106 is electrically connected with, the carbon nanotube composite linear structure to the other end of the anode 112 used as electron emitter 108 electronic transmitting end, in the carbon nanotube composite linear structure of the carbon nanotube layer in the electronic emitter end extending out of a plurality of electronic emitter tip 101. The carbon nanotube composite linear structure to the positive pole 112 of the above-mentioned one end has an electronic of the embodiment of the transmitting terminal 122 the same structure. The carbon nanotube composite linear structure through the conductive adhesive can be fixed on the cathode support body 106 close to the phosphor layer 110 one end of the, manner can also be by welding the composite linear structure and the cathode support body 106 is electrically connected. In the electron emission end of the linear support body 128 is less than the length of the extension of the carbon nanotube layer in the linear support body 128 to extend the length of the extending direction.

The carbon nanotube electron emitter 108 preparation method, comprising the following steps:

(S10) to provide a linear support;

(S20) providing at least one carbon nanotube film or powder, or powder of the carbon nanotube film is wound on the surface of the linear support body form a carbon nano tube;

(S30) removing the states the striation supporting body, is surrounded by the carbon nanotube layer by a hollow tubular carbon nano-tube preform; and

(S40) the tubular carbon nano-tube preform fuse, forming the carbon nanotube electron emitter 108.

Step (S10) in, the linear support body of a control device not only can be under the control of the rotation and around the central axis can be along the extending direction of the central axis, to linear motion.

The supporting body states the striation material can be elemental metal, metal alloy, polymer material, and the like. The elemental metal include gold, silver, copper, rolling, the metal alloy includes copper-tin alloy. Furthermore, the copper-tin alloy surface can be plated with silver. The copper-tin alloy can be 97% copper and 3% tin alloy.

The supporting body states the striationline membrane the winding the carbon nanotube or nano pipeline in the course of, mainly play a supporting role, which itself has a certain stability and mechanical strength, and the chemical method, a physical method or mechanical method to remove. The linear material of the support body in accordance with the above-mentioned conditions can be selected that all of the material. Can be understood, this linear support body can be made of different diameters. This embodiment uses a diameter of 25 microns of aluminum wire as the linear supporting body.

Step (S20) in, the carbon nanotube film or carbon nano-tube as a self-supporting structure. The carbon nanotube film can be a carbon nanotube or the carbon nanotube steamroll film such as wind. The carbon nanotube film is composed of a plurality of carbon nanotube composition, the plurality of carbon nanotubes are arranged in order or disorder. Refer to the so-called unordered ruleless the arrangement direction of the carbon nanotube. Refer to the so-called ordered arrangement with the direction of arranging the carbon nanotube. Specifically, when the carbon nanotube film comprises unordered the carbon nanotube, the carbon nanotube mutual winding or isotropic arrangement; when the carbon nanotube film comprises an ordered array of the carbon nanotube, the carbon nanotube or more along one direction of the preferred orientation arrangement direction. The so-called "preferred orientation" refer to the majority of the carbon nanotube film in the carbon nano-tube in a direction or several direction having greater probability the orientation of the; in other words, the carbon nanotube film in the axial direction of the most of the carbon nanotube substantially along the same direction or several direction.

When the carbon nanotube film is a carbon nanotube film drawing or the powder, the step (S20) may include the following specific steps:

Step (S210), form at least a carbon nanotube array.

Providing a substrate, said carbon nanotube array formed on the substrate surface. The carbon nanotube array is composed of a plurality of carbon nanotube, the carbon nanotube is a single-walled carbon nanotubes, double-wall carbon nanotubes and multi-wall carbon nano-tube in one or more of the. In this embodiment, the plurality of the carbon nanotube is a multi-wall carbon nano-tube, and the plurality of carbon nanotubes are substantially parallel and perpendicular to the substrate, the carbon nanotube array does not contain impurities, such as amorphous carbon or residual catalyst metal particles, or the like. The method for preparing the carbon nano-tube array, including chemical vapor deposition, arc discharge, such as laser ablative law , the method for preparing the carbon nano-tube array is not limited, can refer to the Chinese mainland open Patent application section 02134760.3 number. Preferably, the carbon nanotube array is surpasses along the platoon carbon nanotube array.

Step (S220), separated from the carbon nanotube in the array to obtain a carbon nanotube film drawing or powder.

This embodiment adopts the adhesive tape with a certain width, the carbon nanotube array of the nipper or the clip contact with a certain width in order to select a plurality of carbon nanotube; tensile at a certain speed the selected carbon nanotube, the pull direction substantially perpendicular to the direction of the growth of the carbon nano-tube array. The first tail is connected so as to form a plurality of carbon nanotube fragment, thereby forming a continuous carbon nanotube film drawing. In the above-mentioned in the process of drawing, the plurality of carbon nanotube fragment in pulling force along the direction of stretching under the effect of gradually separated from the substrate at the same time, because of the action of van der Waals force, the selected fragment of a plurality of carbon nanotubes with other carbon nanotube segments respectively connected to the first tail is pulled continuously, so as to form a continuous, uniform and having a certain width of the carbon nanotube film drawing. The carbon nanotube film drawing the width of the growth of the carbon nanotube array of the size of the substrate, the carbon nanotube is not limited to the length of the regulator, can be prepared according to the actual demand. Can be understood, when the carbon nanotube regulator under the condition of very narrow in width, the powder can be formed.

Step (S230), the carbon nanotube film drawing or powder supporting body is twisted to form a carbon nanotube layer.

The carbon nanotube film drawing or powder supporting body is twisted to form a carbon nano tube method comprises the following steps: first, through the above-mentioned method for the preparation of the carbon nanotube film drawing or carbon nano-tube is fixed on the one end of the linear support surface; secondly, the linear support body rotating around the central axis, at the same time along the extending direction of the central axis, to linear motion, that is, spiral winding of a surface can be obtained with a carbon nanotube film drawing or signal of the linear support of the pipeline. Wherein said carbon nanotube film drawing or powder most of the carbon nanotube in the spiral direction of the axis of the supporting body with the extending direction of the cross angle α, < α ≤ 90° 0 °. Understandable, thickness or film drawing the carbon nanotube powder under the situation of a certain diameter, the smaller the cross-angle α, the winding of the carbon nanotube layer is thin, the greater the cross-angle α, the winding of the carbon nanotube layer on the thickness of the more thick.

Step (S30), removing the linear supporting body, is surrounded by the carbon nanotube layer by a hollow tubular carbon nano-tube preform.

The linear support by a chemical method, a physical method or mechanical method to remove. When adopting chirpy metal material and its alloy as the linear supporting body, such as iron or aluminum and its alloy, can use a acidic solution and the reaction of active metal material, and removing the linear supporting body; when the not of active metal material and its alloy as the linear support bodies, if gold or silver and alloys thereof, can be used the method of heating evaporation, removing the linear supporting body; when a high polymer material as the linear support body, can be used along the stretching device states the striation in the direction of central axis of the support body is pulled out the linear supporting body. This embodiment adopts the concentration is 0.5mol/L hydrochloric acid solution corrosion of the winding with a carbon nanotube film drawing of the aluminum, the aluminum wire removed. Can be understood, according to the linear support body can be obtained by the different diameter of the inner diameter of the carbon nanotube structure is different.

As shown in Figure 9, the end of the tubular carbon nanotube prefabricated body is a plurality of carbon nanotubes is enclosed by the tubular structure of a carbon nanotube, the carbon nanotube in the tubular structure around a hollow a plurality of carbon nanotube extends spirally of the linear axis, between adjacent carbon nanotubes is closely connected with through the van der Waals force.

Step (S40), the tubular carbon nano-tube preform fusing, to form the electron emitter.

The tubular carbon nano-tube preform there are three main types of fuse method.

Method a: current fusing method, the tubular carbon nanotube prefabricated link current for heating the fuse. Method a can under the vacuum environment or an inert gas to protect the environment, its specific comprises the following steps:

First of all, the tubular carbon nano-tube preform suspended is arranged in a vacuum chamber a reaction chamber or filled with inert gases.

The vacuum chamber comprises a visual window and an anode terminal and a cathode terminal, and is lower than the vacuum degree 1 × 10^-1 pahi, preferably 2 × 10^-5 pahi. The two ends of the tubular carbon nano-tube preform respectively connected with the anode terminal and the cathode is electrically connected with binding post. In this embodiment, the anode terminal and the cathode terminal is a diameter 0.5 mm copper wire, the tubular carbon nanotube the diameter of the preform 25 microns, length 2 cm.

The full reaction chamber structure of the inert gas is the same as the vacuum chamber, the inert gas can be helium or argon plasma.

Secondly, the two ends of the tubular carbon nano-tube preform a voltage is applied, the heating current is switched on of the fuse.

The anode terminal and the cathode terminal exerts one between the 40 volts DC voltage. Personnel should understand the technical field, the anode terminal and the cathode terminal of the voltage is applied between the selected of the inner diameter of the tubular carbon nano-tube preform, foreign, the wall thickness and length. Through the Joule's heat generated in the direct current under the condition of heating the tubular carbon nano-tube preform. The heating temperature is preferably the 2000K to 2400K, the heating time is less than 1 hour. Direct current in the heating process in a vacuum, through the tubular carbon nano-tube preform will gradually increase of current, but very fast current will begin to decline until the tubular carbon nanotube prefabricated body is fuse. In the fuse the former, tubular carbon nano-tube preform a bright spot will appear in the, long-term carbon nanotube is from the bright spot of the fuse.

The tubular carbon nanotube due to the resistance of the prefabricated body is different, the divided voltage of each point is also different. In the tubular carbon nano-tube preform a point of relatively big resistance, will receive the greater sub-voltage, thus have greater heating power, produce more Joule heat, the temperature rapidly rises of the point. In the process of the device, the resistance of the point will become increasingly large, lead to divided voltage of the point is also growing, at the same time, until the increasing temperature is also at this point, two electron emission end of the form. In the fuse the instant, between the cathode and the anode will produce a very small gap, the vicinity of the blowout point position at the same time, because of the carbon evaporation, vacuum degree is poor, and the fuse is close to, the more obvious volatilization of carbon, these factors will make the fuse the moment generated near the blowout point of gas ionization. The ion bombardment ionization after fusing of the end of the tubular carbon nano-tube preform, the more close to the fuse is, the more the ion bombardment, so that the tubular carbon nanotube prefabricated body part form a conical throat, to form the electron emission portion.

This embodiment adopts the vacuum fusion method, tubular carbon nano-tube preform the carbon nanotube obtained after fusing of the body of the tubular structure of the body of the conical-shaped structure of the pollution of the port, and, in the heating process of the tubular carbon nano-tube preform improving will have a certain mechanical strength, with good field emission performance.

Method two: electronic blast technique , that is, first, heating the tubular carbon nano-tube preform, then to provide an electron emission source, using the electron emission source bombarding the tubular carbon nano-tube preform, the tubular carbon in the preform bombardment place fuse. The second method, the method specifically comprises the following steps:

First, heating the tubular carbon nano-tube preform.

The tubular carbon nanotube prefabricated body is arranged in a vacuum system. The vacuum the vacuum degree of the system maintain 1 × 10^-4 pahi to 1 × 10^-5 pahi. In the tubular carbon nanotube prefabricated body access current, heating the tubular carbon nano-tube preform to 1800K to 2500K.

Secondly, to provide an electron emission source, using the electron emission source bombarding the tubular carbon nano-tube preform, the tubular carbon in the preform bombardment place fuse.

The electron emission source includes a field emission tip with a plurality of long-term carbon nanotube. The electron emission source access a low electric potential, the tubular carbon nano-tube preform access a high potential. The electron emission source with the tubular carbon nano-tube preform is placed in a vertical position, and the electron emission source-pointing the tubular carbon nanotube prefabricated integumentarily is the bombardment. The electronic emission source of electron beam bombardment of the tubular carbon nanotube the side wall of the preform, the tubular carbon nanotube prefabricated integumentarily the rise of the temperature of the bombardment place. In this case, the tubular carbon nanotube prefabricated integumentarily with the highest temperature is the bombardment. The tubular carbon nanotube in the prefabricated experience bombardment place fuse, forming a plurality of field emission tip.

Furthermore, the above-mentioned electron emission source relative to the tubular carbon nano-tube preform specific positioning, can be realized through a console. Wherein the electron emission source prefabricated body with the tubular carbon nanotube is at the distance of between 50 microns to 2 millimeters. The embodiment of the invention preferably the tubular carbon nano-tube preform can be secured to one of the three-dimensional moving the operator. By the adjustment of the tubular carbon nano-tube preform the movement of a three-dimensional space, so that the electron emission source with the tubular carbon nano-tube preform in the same plane and perpendicular to each other. The electron emission source prefabricated body with the tubular carbon nanotube is at the distance of between 50 microns.

Can be understood, in order to provide more large field emission current in order to raise the local temperature of the carbon nano-tube preform, can use a plurality of electron emission sources simultaneously provide field emission current. Furthermore, also can use other forms of the electron beam to the tubular carbon nano-tube preform fixed point of the fuse, for example, traditional hot cathode electron source of the electron beam or other common electron beam emitted from the field emission electron source.

Method three: laser irradiation, that is, with a certain power and scanning speed of the laser irradiation the tubular carbon nano-tube preform, in the tubular carbon nano-tube preform into the current, the tubular carbon nano-tube preform illumination place in the laser fuse, to form the electron emitter. The third method, the method specifically comprises the following steps:

First of all, in order to a certain power and scanning speed of the laser irradiation the tubular carbon nano-tube preform.

The above-mentioned tubular carbon nanotube prefabricated body is arranged in the air or in an atmosphere containing an oxidizing gas. In certain power and scanning speed of the laser irradiation the tubular carbon nano-tube preform. When the carbon tubular carbon nano-tube preform a certain position of the irradiated by the laser after rising the temperature, the oxygen would oxidation in the air the carbon nanotube of the position, produce a defect, the resistance of the so that the position becomes larger.

Understandable, laser irradiation the tubular carbon nano-tube preform and the time is inversely proportional to the power of the laser. That is, the laser power is relatively large, laser irradiation the tubular carbon nano-tube preform for a relatively short time; the laser power is small, laser irradiation the tubular carbon nano-tube preform for a long time.

In this invention, the power of the laser for 1 tile -60 watts, scanning velocity is 100-2000 mm/seconds. The embodiment of the invention preferably the laser power of 12 tile, scanning speed is 1000 mm/sec. In the embodiment of the invention of the laser can be a carbon dioxide laser, semiconductor laser, ultraviolet laser, laser of any form, as long as it can produce the heating effect.

Secondly, in the tubular carbon nano-tube preform into the current, tubular carbon nano-tube preform illumination place in the laser fuse, the tubular structure forming two carbon nanotube.

The tubular carbon nanotube after laser irradiation for prefabricated body is put in a vacuum system, the two ends of the tubular structure of the carbon nanotube is respectively connected with the anode terminal and the cathode terminal is electrically connected with, injected current. The tubular carbon nanotube prefabricated body part of it is irradiated by the laser position of the highest temperature of the water, finally, the tubular carbon nanotube at the prefabricated through the fuse, to form the tubular structure form two carbon nanotube.

Can be understood, the tubular carbon nanotube can also be prefabricated body is arranged in a vacuum or in an atmosphere of the inert gas-filled. The tubular carbon nano-tube preform at the same time in the current for heating, in certain power and scanning speed of the laser irradiation the tubular carbon nano-tube preform. Because the atmosphere of vacuum or inert gas, so the tubular carbon nano-tube preform can be stably heated. When the tubular carbon nano-tube preform a certain position of the temperature rise in the irradiated by the laser, this position is the position of highest temperature, finally, the tubular carbon nanotube in the prefabricated experience out.

At the same time, because the two ends of the tubular carbon nano-tube preform are respectively fixed on the anode terminal and the cathode terminal, and van der Waals force between adjacent carbon nanotubes, in the course of in the fuse therefore, the carbon nanotube of the fuse is far away from the fuse and is connected with the adjacent under the effect of the carbon nanotube, its spiral gradually tend to the extending direction of the direction, in other words, the spiral direction of the carbon nanotube with the extending direction of the cross angle α formed by gradually close to 0° and dispersed, to form the plurality of diverging electron emission tip. At the same time, because the tubular carbon nano-tube preform in the fuse the instantaneous, the vicinity of the blowout point position, because carbon evaporation, vacuum degree is poor, and the proximity fuse is, the more obvious the volatilization of the carbon, so that the tubular carbon nano-tube preform fuse to form a conical throat, thus form said transmitting part of the carbon nanotube.

On the other hand, if the elliptical step (S30) removing the states the striation steps of the support body, and directly on the (S20) on the basis of the step (S40) the fusing step, the can be obtained a linear support surface is provided with a layer of carbon nanotube composite structure, the supporting body states the striation can improve the mechanical strength of the electron emitter.

As shown in Figure 10, further, the field emission pixel tube 100 comprises a grating body 113, the grating body 113 is a hollow cylinder is provided with a cylindrical structure, it has a top surface and a far away from the anode from the top surface 112 of the annular side wall extending in the direction of. The grating body 113 of the top surface has a positive for the electron emitter 108 electronic transmitting terminal 122 of NxO coupler 115. The grating body 113 can be of the cross section is circular, an oval or a triangle, rectangle or other polygon. The grating body 113 surrounding the electron emitter 108 is set, that is, electron emitters 108 are contained in a grating body 113 inner, and electron emitter 108 electronic transmitting terminal 122 to a grating body 113, attack of the top surface 115. In this embodiment, the grating body 113 is a hollow cylinder, its material as a conductive material, and with the cathode 104 of the anode 112 are respectively arranged at intervals. The gate electret 113 through the gate electrode 117 is electrically connected with the shell 102 external. When the field emission pixel tube 100 when the working voltage is applied, the grating body 113 and the electron emitter 108 electric field is formed between the, tubular structure of carbon nanotube in the emission of electrons under the action of electric field, the top surface of the grid body attack through 115, the anode 112 under the action of high voltage to accelerate for bombarding the phosphor layer 110. At the same time, because the electron emitter 108 is located in a grating body 113 inner, a grating body 113 can play a shielding effect, in order to shield the anode 112 of the high-pressure, protection of electron emitter 108, of the tubular structure extend the service life of the carbon nanotube. By adjusting the gate electrode 117 can control the voltage of the electron emitter 108 of the emission current, thereby adjusting the brightness of the fluorescent screen. Can be understood, the gate electret 113 is a selectable structure.

Furthermore, the field emission pixel tube 100 further comprises a shell 102 of the getter 118, adsorption field emission pixel is used for the residual gas, emission pixel maintenance field the degree of vacuum within the tube. The getter 118 can be evaporable getter metal film, in the housing 102 through the high-frequency heating and after sealing of the plating formed in the housing 102 on the inner wall of. The getter 118 can also be a non-evaporable getter, is arranged in the cathode support body 106 is. The non-evaporable getter 118 material is mainly comprises titanium, zirconium, hafnium, thorium, rare-earth metal and its alloy.

When the field emission pixel tube 100 at the time of work, are respectively to the anode 112 and cathode 104 apply different voltage makes the anode 112 and cathode 104 is formed between the electric field, an electric field of the electron emitter 108 tip that is, the electronic emission powder, electron bombardment phosphor layer 110 of the fluorescent substance, to emit visible light. Visible light through the anode 112 through field emission pixel tube 100 extrudes to 124 injection, a plurality of such field emission pixel tube 100 are aligned, it can be used for lighting or information display.

Please refer to Figure 11, 2nd embodiment of the present invention to provide a field emission pixel pipe 200, its basic structure and 1st tube field emission pixel by the embodiment 100 is basically the same structure, its difference is that the field emission pixel tube 200 in the fluorescent powder layer is arranged on the end surface of the anode. The field emission pixel pipe 200 includes a housing 202 and a field emission unit 203, the field emitting unit 203 is located in the casing 202 in, the housing 202 for the field emission unit provides a vacuum space.

The field emitting unit comprises a cathode 204, a phosphor powder layer 210, an anode 212 and a negative pole lead wire 216 and a positive pole lead wire 214. The cathode 204 and the anode 212 are arranged at intervals, the cathode lead 216 and the cathode 204 is electrically connected with, the anode lead wire 214 and the anode 212 is electrically connected, the cathode 204 can emit electrons, the emitted electrons in the cathode 204 and the anode 212 under the action of the electric field generated to reach the phosphor layer 210, bombarding the phosphor layer 210 in the fluorescent material of the light-emitting.

The housing 202 is a vacuum the sealing structure. In this embodiment, the housing 202 is a hollow glass cylinder, and the cylinder diameter is 1 mm to 5 mm, the height of 2 mm to 5 mm. The housing 202 includes a the one end of the region 224. The shell 202 material is a transparent material such as: quartz or glass. Understandably, the housing 202 can also be a hollow cube, triangular prism or other polygonal prism, the technicians of this field can be selected according to the actual situation.

The cathode 204 includes a female electrode support body 206 with an electronic emitter 208. The cathode support body 206 and one end of the electron emitter 208 is electrically connected with one end, the other end through a cathode lead wire 216 is electrically connected to the shell 202 outer. The cathode support body 206 is an electrical conductor, such as: metal wire or metal rod. The cathode support body 206 the shape is not limited, and can be heat-conducting and has a certain strength. In this embodiment the cathode support body 206 is preferably nickel wire.

The electron emitter 208 includes a plurality of carbon nanotube carbon nanotube surrounded by the tubular structure. The majority of the carbon nano-tube tubular structure around a hollow carbon nanotube extends spirally of the linear axis, can be understood, the carbon nanotube in the tubular structure there are also very few and non-around the linear axis of the spiral and is a random array of carbon nanotube, the carbon nanotube of the minority of random arrangement in the extending direction of the no rules. However, the small number of random arrangement of the carbon nanotubes of the carbon nanotube does not affect the manner of the tubular structure and arranged in the extending direction of the carbon nanotube. In this, the length direction of the linear axis is defined as the extending direction of the plurality of carbon nanotube, a plurality of carbon nanotube states the striation formed around the spiral axis is defined as the direction of the spiral direction. Adjacent to the spiral direction of the first end of the carbon nanotube is connected through the van der Waals force, adjacent to the extending direction of the carbon nanotube of closely through the van der Waals force. Most of the carbon nanotubes of the carbon nanotube in the tubular structure of the spiral direction and the length direction of the linear axis to form a certain cross-angle α, and < α ≤ 90° 0 °. The electron emitter 208 and 1st tube field emission pixel by the embodiment 100 of the electron emitter 108 of the material, structure and the same preparation method.

The electron emitter 208 with a electronic transmitting terminal 222, the electronic transmitting terminal 222 is fixed to the electron emitters 208 away from the cathode support body 206 one end of, and to the anode 212 extends. The electron emitter 208 and electronic transmitting end 222 opposite the other end of the supporting body with the stated negative pole 206 is electrically connected. Furthermore, the electron emitter 208 electronic transmitting terminal 222 located in the orthographic projection of the phosphor layer 210 surface.

The anode 212 away from the housing 202 of the optical part 224 is provided, in other words the anode 212 is not arranged in the housing 202 and extrudes to 224 position. The anode 212 is an electrical conductor, such as:a metal rod. The anode 212 the shape is not limited, and can be heat-conducting and has a certain strength. In this embodiment, anode 212 is preferably a copper condenser. The copper metal rod diameter is 100 micron to 1 centimeter. Can be understood, the diameter of the copper metal can be selected according to practical requirements. The anode 212 includes a end face of one end of the 220, the anode 212 away from the end face 220 through a the other end of the anode lead 214 electrically connected to the shell 202 outer. The end surface 220 is a polished end face. The polishing of the end face 220 can be a flat, hemispherical, spherical, conical, concave or other shaped end face.

The phosphor layer 210 is arranged in the anode 212 of the end face 220 on. The fluorescent powder layer 210 can be a white phosphor powder of the material, can also be a single-color fluorescent powder, for example red, green, blue fluorescent powder, , when the electronic bombardment of the phosphor layer 210 can be a white light or other colors visible light. The fluorescent powder layer 210 is deposition or coating method can be adopted to the anode 212 of the end face of the one end 220 on. The fluorescent powder layer 210 a thickness of 5 to 50 microns. The end face 220 may be reflective at the phosphor layer 210 emitted by the light source.

The electron emitter 208 and the anode 212 of the relationship may be in a variety of position, please refer to fig. 12 to fig. 15. Can make the electron emitter 208 electronic transmitting terminal 222 and the anode 212 of the end surface 220 is provided in the; can make the electron emitter 208 and the anode 212 shaft to form an acute angle, the electronic transmitting terminal 222 with the end face 220 is arranged diagonally to the; can make the electron emitter 208 and the anode 212 perpendicular or parallel to each other axially, the electronic transmitting terminal 222 is arranged in the end face 220 nearby. Can be understood, the position relationship between the above-mentioned arrangement is not limited to this, only need to satisfy the electron emitter 208 electronic transmitting terminal 222 is the electron emitter 208 closest to the anode 212 of the end face 220 can be one end of the. Preferably, electronic transmitting terminal 222 with the end face 220 distance is less than 5 millimeters.

Furthermore, the field emission pixel tube 200 further includes a bit in the shell 202 of the getter in 218, adsorption field emission pixel is used for residual gas, emission pixel maintenance field the degree of vacuum within the tube. The getter 218 can be evaporable getter metal film, in the shell 202 after sealing through high-frequency heating evaporation method to form in close proximity to the cathode 204 of the shell 202 on the inner wall. The getter 218 can also be a non-evaporable getter, is fixed on the cathode support body 206 is. The non-evaporable getter 218 material is mainly comprises titanium, zirconium, hafnium, thorium, rare-earth metal and its alloy.

When the field emission pixel pipe 200 when working, the anode 212 and cathode 204 add a voltage for forming an electric field between, of an electric field of the electron emitter 208 electronic transmitting terminal 222 emit electrons, emit electrons reach the anode 212, bombardment anode 212 of the surface of the phosphor layer 210, emit visible light. Wherein visible light directly through the housing part 202 and extrudes to 224 injection, the other part of the visible light through the anode 212 end face 220 of the reflection, through the housing 202 and extrudes to 224 injection.

Please refer to Figure 16, 3rd embodiment of the present invention to provide a field emission pixel pipe 300, the basic structure and 2nd pipe field emission pixel by the embodiment 200 is basically the same structure, the difference lies in that, the field emission pixel tube 300 includes a housing 302 and is arranged on the housing 302 of the plurality of field emission unit 303, wherein the plurality of the field emission unit 303 is arranged at a distance from each other, and arranged in accordance with a predetermined law. The field emitting unit 303 and the 2nd embodiment field emission unit 203 of the same material and structure. Each field emission unit 303 comprises a cathode 304, an anode 312, a cathode lead 316, an anode lead 314 and a phosphor powder layer 310. The cathode 304 includes a female electrode support body 306 with an electronic emitter 308, said electronic emitter 308 comprises an electronic transmitting terminal 322. The anode 312 includes a end face of one end of the 320. The fluorescent powder layer 310 is arranged on the anode 312 end face 320 on. The anode 312 away from the end surface 320 through a the other end of the anode lead 314 electrically connected to the shell 302 outer.

Furthermore, the field emission pixel tube 300 further comprises a shell 302 getter of the inner wall 318, for adsorption field emission pixel tube 300 internal residual gas, maintenance field emission pixel tube 300 internal vacuum degree. The getter 318 can be evaporable getter metal film, in the housing 302 through the high-frequency heating and after sealing of the plating formed in the housing 302 on the inner wall. The getter 318 can also be a non-evaporable getter, is fixed on the cathode 304 or separate a cathode lead 316 on. The non-evaporable getter 318 material is mainly comprises titanium, zirconium, hafnium, thorium, rare-earth metal and its alloy.

The housing 302 is a vacuum the sealing structure. The housing 302 is for each field emission unit 303 in the anode 312 of the end surface 320 is a part of the region 324, the emergent part 324 away from the anode 312 is provided. The field emitting unit 303 in the housing 302 can be in a different arrangement, such as in a linear arrangement or in a certain array, the technicians of this field can be set according to the actual situation. In this embodiment, field emission unit 303 is a linear distance are arranged in the housing 302 in. Can be understood, when the field emission pixel tube 300 when assembling large-screen display, a plurality of field emission unit 303 between row distance to maintain equal to the row spacing.

When the field emission pixel tube 300 work, in a positive pole 312 and a cathode 304 add a voltage for forming an electric field between, of an electric field of the electron emitter 308 electronic transmitting terminal 322 emit electrons, emitted electrons reach the anode 312, bombardment anode 312 a layer of fluorescent powder of the surface 310, emit visible light. Wherein a portion of the visible light directly through the shell 302 extrudes to 324 injection, the other part of the visible light through the anode 312 end face 320 of the reflection, through the shell 302 extrudes to 324 injection. Since the field emission pixel tube 300 includes a plurality of field emission unit 303, can be realized through an external control circuit to control the plurality of field emission unit 303 to work independently or to work at the same time.

The field emission pixel tube 300 includes a plurality of field emission unit 303, but also, each field emission unit 303 small volume, can be conveniently used for assembling large outdoor display, and the assembly of the high resolution large outdoor display. Furthermore, the field emission pixel tube 300 in, a plurality of field emission unit 303 placed in a shell 302 inner, and each field emission unit 303 in the cathode 304 and the anode 312 does not need to be precisely aligned, the preparation process can be simplified, the cost is lowered.

Please refer to Figure 17 and Figure 18, 4th embodiment of the present invention to provide a field emission pixel pipe 400, the field emission pixel pipe 400 includes a housing 402 and at least one field emission unit 403, the field emitting unit 403 is located in the casing 402 inner. The field emission pixel tube 400 of the 2nd embodiment of the basic structure of the field emission pixel tube 200 is the same as the basic structure, in which different, each of said field emission unit includes a plurality of anode, the plurality of anodes are arranged according to a certain rule.

Each field emission unit 403 comprises a cathode 404, a phosphor powder layer 410, a 1st anode 411, a anode 2nd 3rd anode a 412 and 413. The cathode 404 with the 1st anode 411, 2nd anode 412 and 3rd anode 413 are arranged at intervals in the shell 402 inner. The 1st anode 411, the 1st anode 411, 2nd anode 412 and 3rd anode 413 around the negative pole 404 is set, and its positive projection arranged in the shape of triangle, three anodes are respectively the orthographic projection of the corresponding bit in the the three apexes of the triangle. The cathode 404 includes a 1st electron emitter 407, a 2nd electron emitter 408 and a 3rd electron emitter 409, the 1st electron emitter 407, a 2nd electron emitter 408 and a 3rd electron emitter 409 respectively to the corresponding 1st anode 411, 2nd anode 412 and 3rd anode 413 extending in the direction of. The 1st electron emitter 407, 2nd electron emitter 408 and 3rd electron emitter 409 respectively include an electronic transmitting terminal 422. The 1st electron emitter 407, 2nd electron emitter 408 and 3rd electron emitter 409 are respectively connected with the 1st anode 411, 2nd anode 412 and 3rd anode 413 one-to-one correspondence, and the 1st electron emitter 407, 2nd electron emitter 408 and 3rd electron emitter 409 electronic transmitting terminal 422 are respectively to the 1st anode 411, 2nd anode 412 and 3rd anode 413 is arranged. The 1st anode 411, 2nd anode 412 and 3rd anode 413 are respectively provided with an end face 420. The 1st electron emitter 407, 2nd electron emitter 408 and 3rd electron emitter 409 electronic transmitting terminal 422 are respectively located in the orthographic projection of the each electron emitter corresponding to the anode end of the within the range of. The phosphor layer 410 respectively arranged on the 1st anode 411, 2nd anode 412 and 3rd anode 413 the surface of the end face.

The housing 402 is a vacuum the sealing structure. The housing 402 includes a glowing part 424, the light 424 with the 1st anode 411, 2nd anode 412 and 3rd anode 413 end face is provided. When the housing 402 includes a plurality of field emission unit 403 is, the plurality of field emission unit 403 may have a different arrangement, such as in a linear arrangement or in a certain array, the technicians of this field can be set according to the actual situation.

The cathode 404 further includes a female electrode support body 406, the cathode support body 406 is an electrical conductor, such as: metal wire or metal rod. The cathode support body 406 the shape is not limited, and can be conductive and has a certain strength. The invention embodiment the cathode support body 406 is preferably nickel wire. The 1st electron emitter 407, 2nd electron emitter 408 and 3rd electron emitter 409 respectively connected with the one end of the cathode support body 406 is electrically connected with one end of, and the 1st electron emitter 407, 2nd electron emitter 408 and 3rd electron emitter 409 electronic transmitting terminal 422 near the respectively corresponding to each of the electron emitters arranged on the end surface of the anode. This field emission pixel pipe 400 further includes a cathode lead 416, the cathode support body 406 away from the 1st electron emitter 407, 2nd electron emitter 408 and 3rd electron emitter 409 through the one end of the cathode lead wire 416 is connected to the shell 402 outer.

This embodiment of electron emitters 1st 407, 2nd electron emitter 408 and 3rd electron emitter 409 respectively of the tubular structure include a carbon nanotube, the carbon nanotube in the tubular structure around a hollow most of the carbon nanotube extends spirally of the linear axis, can be understood, the carbon nanotube in the tubular structure there are also very few and non-around the linear axis of the spiral and is a random array of carbon nanotube, the carbon nanotube of the minority of random arrangement in the extending direction of the no rules. However, the small number of random arrangement of the carbon nanotubes of the carbon nanotube does not affect the manner of the tubular structure and arranged in the extending direction of the carbon nanotube. In this, the length direction of the linear axis is defined as the extending direction of the plurality of carbon nanotube, a plurality of carbon nanotube states the striation formed around the spiral axis is defined as the direction of the spiral direction. Adjacent to the spiral direction of the first end of the carbon nanotube is connected through the van der Waals force, adjacent to the extending direction of the carbon nanotube of closely through the van der Waals force. Most of the carbon nanotubes of the carbon nanotube in the tubular structure of the spiral direction and the length direction of the linear axis to form a certain cross-angle α, and < α ≤ 90° 0 °. The 1st electron emitter 407, 2nd electron emitter 408 and 3rd electron emitter 409 structure, material and its preparation method and 1st embodiment electron emitter 108 the same.

The 1st anode 411, 2nd anode 412 and 3rd anode 413 are is an electrical conductor, such as:a metal rod. The 1st anode 411, 2nd anode 412 and 3rd anode 413 the shape is not limited, and can be heat-conducting and has a certain strength. In the embodiment of the invention, the 1st anode 411, 2nd anode 412 and 3rd anode 413 are preferably nickel metal rod. The metal rod diameter is 100 micron to 1 centimeter. Can be understood, the diameter of the metal rod can be selected according to practical requirements. The 1st anode 411, 2nd anode 412 and 3rd anode 413 is assumes one equilateral triangle, wherein the negative pole 404 is arranged in the center of the equilateral triangle. Can be understood, the 1st anode 411, 2nd anode 412 and 3rd anode 413 can be the positional relationship between the can be appropriately adjusted according to needs. The 1st anode 411, 2nd anode 412 and 3rd anode 413 respectively include a polished end face 420. The end face 420 can be a flat, hemispherical, spherical, conical, concave or other shaped end face. The end face 420 can reflect the light emitted by the phosphor layer. This field emission pixel pipe 400 further includes a anode lead 415. The 1st anode 411, 2nd anode 412 and 3rd anode 413 away from its end face 420 respectively through one end of the anode lead 415 is electrically connected to the shell 402 outer.

The phosphor layer 410 are respectively disposed in the 1st anode 411, 2nd anode 412 and 3rd anode 413 end 420 of the surface. The 1st anode 411, 2nd anode 412 and 3rd anode 413 and the fluorescent powder on the layer 410 can be respectively to three different color phosphor powder. When the electronic bombardment the 1st anode 411, 2nd anode 412 and 3rd anode 413 and the fluorescent powder on the layer 410 can be a white light or other colors visible light. The 1st anode 411, 2nd anode 412 and 3rd anode 413 and the fluorescent powder on the layer 410 deposition or coating method can be adopted to set up in the stated 1st anode 411, 2nd anode 412 and 3rd anode 413 end 420 of the surface. The 1st anode 411, 2nd anode 412 and 3rd anode 413 and the fluorescent powder on the layer 410 a thickness of 5 microns to 50 microns. Can be understood, the 1st anode 411, 2nd anode 412 and 3rd anode 413 and the fluorescent powder on the layer 410 can be further respectively is arranged in the corresponding 1st anode 411, 2nd anode 412 and 3rd anode 413 of the other positions on the surface. As long as the 1st electron emitter 407, 2nd electron emitter 408 and 3rd electron emitter 409 the transmitted electronic energy bombardment to the corresponding phosphor layer 410 can be.

Each of the electron emitter and the anode of the relationship may be in a variety of position, with reference to the position of the 2nd embodiment of the utility model relates to a field emission pixel tube 200 with the electron emitter in the position relationship between the anode.

Furthermore, the field emission pixel tube 400 further comprises a shell 402 of the getter the inner wall 418, for adsorption field emission pixel tube 400 internal residual gas, maintenance field emission pixel tube 400 internal vacuum degree. The getter 418 can be evaporable getter metal film, in the housing 402 after sealing through high-frequency heating evaporation method to form the shell 402 on the inner wall. The getter 418 can also be a non-evaporable getter, is fixed on the cathode 404 or separate a cathode lead 416 on. The non-evaporable getter 418 material is mainly comprises titanium, zirconium, hafnium, thorium, rare-earth metal and its alloy.

When the field emission pixel tube 400 at the time of work, are respectively in the 1st anode 411, 2nd anode 412 and 3rd anode 413 and cathode 404 add a voltage for forming an electric field between, the 1st through the electric field electron emitter 407, 2nd electron emitter 408 and 3rd electron emitter 409 emit electrons, emitted electrons reach the 1st anode 411, 2nd anode 412 and 3rd anode 413, are respectively bombardment 1st anode 411, 2nd anode 412 and 3rd anode 413 on the phosphor layer 410, to emit visible light. Wherein visible light directly through the light part 424 injection, the other part of the visible light through the end 420 of the reflection, through the light 424 injection. This field emission pixel pipe 400 can be used for a large-scale outdoor higher resolution color display.

Compared with the prior art, this invention adopts the carbon nano-tube tubular structure as the electron emitter, the electron emitter mechanical strength and heat dissipation efficiency is improved, and the carbon nano-tube tubular structure includes a plurality of projecting annular electronic emitter tip, the electron emitter can effectively reduce the electric field shielding effect, obtained with a larger density of the field emission current. The field emitting unit can be used for assembling the lighting device or the display device.

Furthermore, technical personnel in the field in the books can also be other changes within the spirit of the invention, of course, these according to the invention the change of the spirit of the, should be included in the invention within the scope of protection requested.