.1310203 九、發明說明： 【發明所屬之技術領域】 本發明涉及一種場發射元件，尤其涉及一種雙面發光 之場發射像素管。 【先前技術】 場發射電子源以及利用該電子源轟擊螢光物質而發光 之場發射發光技術，已經在場發射平面顯示器等領域得到 應用。這種場發射技術係在真空環境下，利用外加電場作 用將尖端之電子激發出來，電子轟擊螢光粉發出可見光從 而進行顯示。在傳統場發射電子源中，一般採用微細錮金 屬尖端、矽尖端作為電子發射端，隨著奈米技術之發展， 最近還採用奈米碳管作為電子發射端。 為了有效的利用螢光粉之發光效率，像素管一般工作 在ίο千伏左右之高壓下，然而碳奈米管在強電壓下很容易 損壞，導致發射不穩定。 【發明内容】 有鑒於此，提供一種可以在高壓下穩定工作之場發射 元件實為必要。 一種雙面發光之場發射像素管，其包括：一個中空殼 體，該殼體具有一個第一出光部及一個第二出光部，該第 一出光部與該第二出光部相對，該第一出光部之内壁依次 有第一螢光層和第一陽極層，該第二出光部之内壁依次有 第二螢光層和第二陽極層。所述殼體内部係真空密封的， 並且在第一出光部和第二出光部之間有一個金屬筒，該金 .1310203 ： 屬筒内壁有一層經固化之奈米漿料層，該奈米衆料層含有 導電的奈米材料，該金屬筒與至少一個陰極電極電連接。 相對於先前技術，所述雙面發光之場發射像素管之金 屬筒對電場有很強的屏蔽作用，將含有碳奈米管之漿料塗 於金屬筒之内壁作為陰極，則可以有效的減弱碳奈米管周 圍的電場，使得碳奈米管可以在ίο千伏或更高的電壓下穩 定的工作。 I 【實施方式】 以下將結合附圖對本發明作進一步之詳細說明。 本實施例提供一種雙面發光之場發射像素管10。請參 閱圖1及圖2，該場發射像素管10包括：一中空殼體12， 該殼體12具有一第一出光部120及一第二出光部122,該 第一出光部120與該第二出光部122相對，該第一出光部 120之内壁依次有第一螢光層14和第一陽極層16,該第二 出光部122之内壁依次有第二螢光層18和第二陽極層20。 φ 所述殼體12内部係真空密封的，並且在第一出光部120和 第二出光部122之間有一金屬筒22，該金屬筒22内壁塗 有經固化之奈米漿料層24。該金屬筒22與至少一陰極電 極電連接，於本實施例中有兩個陰極電極，分別為第一陰 極電極25和第二陰極電極26。 該殼體12内部係真空密封的，於本實施例中，該殼體 12為中空圓柱體’且該殼體12之材料為石英石或玻璃。 可以理解的係，該殼體12還可以係中空的立方體、三棱柱 或其他多邊形棱柱，同時該殼體12之出光面可以為平面也 .1310203 ； 可以為球面或非球面，本領域技術人員可以根據實際情況 " 進行選擇。 所述第一螢光層14和第二螢光層18分別沈積在第一 出光部120和第二出光部122之内壁上。該第一螢光層14 和該第二螢光層18可以由白色螢光粉，或彩色螢光粉組 成。當電子轟擊第一螢光層14和第二螢光層18時可發出 白色或彩色可見光。所述第一陽極層16鍍在沈積有第一螢 $ 光層14之第一出光部120内壁上並將第一螢光層14覆 蓋，起到導電的作用。所述第二陽極層20鍍在沈積有第二 螢光層18的第二出光部122内壁上並將第二螢光層18覆 蓋，起到導電的作用。 該第一陽極層16和第二陽極層20為金屬膜，具有良 好的導電性，在本實施例中，該第一陽極層16和該第二陽 極層20為鋁膜。 於本實施例中，所述金屬筒22為一圓筒。可以理解的 0 係，該金屬筒還可以為方筒、多邊形筒等其他筒狀結構。 所述金屬筒22内壁有一層經固化的奈米漿料層24， 該奈米漿料層24含有導電的奈米材料，所述奈米材料可以 選自碳奈米管、碳奈米棒、碳60，碳奈米顆粒，以及導電 金屬或半導體的奈米管、奈米線、奈米棒、奈米帶，及其 混合物中的任意一種，本實施例中選用碳奈米管。將配好 的奈米漿料層24塗敷於金屬筒22内壁並將其固化，最後 用橡皮摩擦金屬筒内壁，使更多的奈米漿料層24中的碳奈 米管露頭，增強其導電性。金屬筒22對碳奈米管發射體的 1310203 屏蔽作用取決於奈米漿料層24邊緣與金屬筒22邊緣的距 離，距離越大，屏蔽作用越強。 所述金屬)^ 22通過第一陰極引線220及第二·陰極引線 222分別與第一陰極電極25和第二陰極電極26電連接。 該第一陰極電極25與該第二陰極電極26穿過所述殼體12 並延伸至殼體12外部。在第—陰極電極25和第二陰極電BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field emission element, and more particularly to a field emission pixel tube that emits light on both sides. [Prior Art] A field emission electron source and a field emission illuminating technology that emits light by bombarding a fluorescent substance with the electron source have been applied in fields such as a field emission flat panel display. This field emission technique excites the electrons at the tip by applying an external electric field in a vacuum environment, and the electron bombardment of the fluorescent powder emits visible light for display. In the conventional field emission electron source, the tip of the fine ruthenium metal and the tip of the ruthenium are generally used as the electron-emitting end. With the development of the nanotechnology, a carbon nanotube is recently used as the electron-emitting end. In order to effectively utilize the luminous efficiency of the phosphor powder, the pixel tube generally operates at a high voltage of about kHz, but the carbon nanotube tube is easily damaged under a strong voltage, resulting in unstable emission. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a field emission element that can operate stably under high voltage. A double-emitting field emission pixel tube comprising: a hollow housing having a first light exiting portion and a second light exiting portion, the first light emitting portion being opposite to the second light emitting portion, the first The inner wall of the light exiting portion has a first phosphor layer and a first anode layer, and the inner wall of the second light exiting portion has a second phosphor layer and a second anode layer. The inside of the casing is vacuum-tight, and there is a metal cylinder between the first light exiting portion and the second light exiting portion. The gold 1310203: has a layer of solidified nano slurry on the inner wall of the cylinder, the nanometer The bulk layer contains a conductive nanomaterial that is electrically connected to at least one cathode electrode. Compared with the prior art, the metal tube of the double-sided illumination field emission pixel tube has a strong shielding effect on the electric field, and the slurry containing the carbon nanotube tube is applied to the inner wall of the metal tube as a cathode, which can effectively weaken The electric field around the carbon nanotube allows the carbon nanotube to work stably at a voltage of ίο kV or higher. [Embodiment] Hereinafter, the present invention will be further described in detail with reference to the accompanying drawings. This embodiment provides a field emission pixel tube 10 that emits light on both sides. Referring to FIG. 1 and FIG. 2 , the field emission pixel tube 10 includes a hollow housing 12 , and the housing 12 has a first light exiting portion 120 and a second light exiting portion 122 . The second light-emitting portion 122 is opposite to the first light-emitting portion 120. The inner wall of the first light-emitting portion 120 has a first phosphor layer 14 and a first anode layer 16, and the inner wall of the second light-emitting portion 122 has a second phosphor layer 18 and a second anode. Layer 20. φ The inside of the casing 12 is vacuum-tight, and a metal cylinder 22 is disposed between the first light-emitting portion 120 and the second light-emitting portion 122, and the inner wall of the metal cylinder 22 is coated with a cured nano-slurry layer 24. The metal can 22 is electrically connected to at least one of the cathode electrodes. In the present embodiment, there are two cathode electrodes, which are a first cathode electrode 25 and a second cathode electrode 26, respectively. The interior of the housing 12 is vacuum sealed. In the present embodiment, the housing 12 is a hollow cylinder and the material of the housing 12 is quartz or glass. It can be understood that the housing 12 can also be a hollow cube, a triangular prism or other polygonal prism, and the light emitting surface of the housing 12 can be a flat surface. 1310203; it can be spherical or aspherical, and can be used by those skilled in the art. Make a selection based on the actual situation ". The first phosphor layer 14 and the second phosphor layer 18 are deposited on the inner walls of the first light exit portion 120 and the second light exit portion 122, respectively. The first phosphor layer 14 and the second phosphor layer 18 may be composed of white phosphor powder or color phosphor powder. White or colored visible light may be emitted when electrons strike the first phosphor layer 14 and the second phosphor layer 18. The first anode layer 16 is plated on the inner wall of the first light-emitting portion 120 on which the first phosphor layer 14 is deposited and covers the first phosphor layer 14, thereby functioning as an electric conductor. The second anode layer 20 is plated on the inner wall of the second light exit portion 122 on which the second phosphor layer 18 is deposited and covers the second phosphor layer 18 to function as a conductive. The first anode layer 16 and the second anode layer 20 are metal films having good electrical conductivity. In the present embodiment, the first anode layer 16 and the second anode layer 20 are aluminum films. In the embodiment, the metal cylinder 22 is a cylinder. It can be understood that the metal cylinder can also be a tubular structure such as a square tube or a polygonal tube. The inner wall of the metal cylinder 22 has a layer of cured nano-slurry 24, the nano-slurry layer 24 contains a conductive nano material, and the nano-material can be selected from carbon nanotubes, carbon nano-rods, A carbon nanotube, a carbon nanoparticle, and a conductive metal or semiconductor nanotube, a nanowire, a nanorod, a nanobelt, and a mixture thereof are used. In this embodiment, a carbon nanotube is used. The prepared nano slurry layer 24 is applied to the inner wall of the metal cylinder 22 and solidified, and finally the inner wall of the metal cylinder is rubbed with a rubber to make the carbon nanotubes in the more nano slurry layer 24 outcrop and enhance the same. Electrical conductivity. The shielding effect of the metal cylinder 22 on the 1310203 of the carbon nanotube emitter depends on the distance between the edge of the nanopulp layer 24 and the edge of the metal cylinder 22. The greater the distance, the stronger the shielding effect. The metal 22 is electrically connected to the first cathode electrode 25 and the second cathode electrode 26 through the first cathode lead 220 and the second cathode lead 222, respectively. The first cathode electrode 25 and the second cathode electrode 26 pass through the housing 12 and extend to the outside of the housing 12. At the first cathode electrode 25 and the second cathode
極26穿過的部位可採用玻璃封接技術密封，以保證殼體内 部之密封性。 該場發射像素管10進一步包括-個第-陽極電極28 和-個第二陽極電極30。該第—陽極電極28和第二陽極 電極30分別與第一陽極層16和第二陽極層2〇電連接。該 第-陽極電極28和第：陽㈣極㈣輯述殼體12延仲 至殼體12外部。在第-陽極電極28和第二陽極電極兕穿 ^部位可_玻璃封接技術密封，以保證殼體a内部之 該場發射像素管10進一步包括—^ 附場發射像素管内殘餘氣體，維持=氣^ 32 ’用於贺 真空度。該吸氣0可以為 在殼體12封接後通過高頻加熱蒸32金屬薄膜， -陰極電極25和第二陰極電極26、的二形成於靠近驾 時需保證該吸氣劑32不會覆蓋到第一12内壁上。鍍港 極層2〇 ,也不會造成陰極和陽極之&極層16和第二艮 也可以為非蒸鍍蜇吸氣劑，固定在靠、^路該吸氣劑3 第二陰極電極26的殼體12内壁上。 陰極電極25矛 9 1310203 該場發射像素管10進一步包括一排氣孔34，該排氣 孔34外接真空泵，用以將殼體12抽真空。封裝時，先通 過排氣孔34使場發射像素管1〇達到一定的真空度後再進 行最後的封裝。 當該場發射像素管1〇工作時，分別給第一陽極電極 28與第一陰極電極25、第二陽極電極30與第二陰極電極 26之間加上電壓形成電場，通過電場作用金屬筒22内壁 的奈米漿料層24中的碳奈米管發射出電子，電子穿透第一 陽極層16和第二陽極層20轟擊第一螢光層14和第二螢光 層18，發出可見光。可見光一部分直接從第、: 和第二出光部122射出，一部分射在第一陽極層1 陽極詹20上。第-陽極層16和第二陽極層2 最終分別透過第一出光部12〇和第二出光 ' /、…’ 個這樣的場發射像素管10排列起來可以進彳射出。多 資訊顯示。 #㈣或雙面 相對於先前技術，所述雙面發光之 屬筒對電場有很強的屏蔽作用，將含像素官的金 於金綱:壁作為陰極，則可以有效以= 定的工作。 千伏或更高的電壓下穩 綜上所述，本發明符合發明專利要件，心 利申請。惟，以上所述者僅為本發明之較土戔依法提出專 發明之範圍並不以上述實施方式為限，^4·貧施方式，本 之人士挺依本發明之精神所作之等效体 熟習本案技藝 々飾或變化，皆應涵 1310203 蓋於以下申請專利範圍内。 【圖式簡單說明】 圖1係本發明實施例提供的雙面發光之場發射像素管 的示意圖。 圖2係本發明實施例提供的雙面發光之場發射像素管 沿圖1剖面線Π的截面圖。 【主要元件符號說明】 雙面發光之場發射像素管 10 第一出光部 120 第二出光部 122 第一螢光層 14 殼體 12 第二螢光層 18 第一陽極層 16 第二陽極層 20 金屬筒 22 奈米漿料層 24 第一陰極電極 25 第二陰極電極 26 第一陽極電極 28 第二陽極電極 30 吸氣劑 32 排氣孔 34 11The portion through which the pole 26 passes can be sealed by a glass sealing technique to ensure the tightness of the interior of the housing. The field emission pixel tube 10 further includes a first anode electrode 28 and a second anode electrode 30. The first anode electrode 28 and the second anode electrode 30 are electrically connected to the first anode layer 16 and the second anode layer 2, respectively. The first anode electrode 28 and the third (four) pole (four) are described as being extended to the outside of the casing 12. The first anode electrode 28 and the second anode electrode are sealed by a glass sealing technique to ensure that the field emission pixel tube 10 inside the housing a further includes a residual gas in the field emission pixel tube, and maintains = Gas ^ 32 ' is used for vacuum. The inhalation 0 may be such that the metal film is vaporized by high frequency heating after the casing 12 is sealed, and the cathode electrode 25 and the second cathode electrode 26 are formed to be close to the driving, and the getter 32 is not covered. Go to the inner wall of the first 12th. The plated port layer 2〇 does not cause the cathode and anode & the pole layer 16 and the second layer can also be non-evaporated 蜇 getter, fixed to the getter 3 the second cathode electrode 26 is on the inner wall of the housing 12. The cathode electrode 25 spear 9 1310203 The field emission pixel tube 10 further includes a venting hole 34 externally connected to a vacuum pump for evacuating the housing 12. In the package, the field emission pixel tube 1 is first evacuated through the vent hole 34 to a certain degree of vacuum before final packaging. When the field emission pixel tube 1 is operated, a voltage is applied between the first anode electrode 28 and the first cathode electrode 25, the second anode electrode 30 and the second cathode electrode 26 to form an electric field, and the metal cylinder 22 is applied by the electric field. The carbon nanotubes in the inner slurry layer 24 of the inner wall emit electrons, and the electrons penetrate the first anode layer 16 and the second anode layer 20 to bombard the first phosphor layer 14 and the second phosphor layer 18 to emit visible light. A portion of the visible light is directly emitted from the first, and the second light exit portion 122, and a portion is incident on the anode 20 of the first anode layer 1. The first anode layer 16 and the second anode layer 2 are finally aligned through the first light-emitting portion 12A and the second light-emitting portion / /, ..., respectively. More information is displayed. #(四) or both sides Compared with the prior art, the double-sided illumination tube has a strong shielding effect on the electric field, and the pixel-containing gold is used as the cathode, so that it can work effectively. Stabilizing at a voltage of one kilovolt or higher, the present invention meets the requirements of the invention patent and is hereby filed. However, the above description is only for the scope of the invention, and the scope of the invention is not limited to the above-mentioned embodiment, and the person of the present invention is equivalent to the spirit of the present invention. Familiar with the skill, decoration or change of this case, all should be covered by the following patent application scope 1310203. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a double-sided illumination field emission pixel tube according to an embodiment of the present invention. 2 is a cross-sectional view of the double-emitting field emission pixel tube of the embodiment of the present invention taken along line Π of FIG. [Main component symbol description] Double-sided light-emitting field emission pixel tube 10 First light-emitting portion 120 Second light-emitting portion 122 First fluorescent layer 14 Housing 12 Second fluorescent layer 18 First anode layer 16 Second anode layer 20 Metal cylinder 22 nano slurry layer 24 first cathode electrode 25 second cathode electrode 26 first anode electrode 28 second anode electrode 30 getter 32 vent hole 34 11