1337370 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， 發射像素管。 發射像素管。 尤其涉及一種二極型場 【先前技術】 場發射電子源以及利用該電子源轟擊榮光物質而發光1337370 IX. Description of the Invention: [Technical Field] The present invention relates to a field emission element that emits a pixel tube. Launch the pixel tube. More particularly, it relates to a bipolar field. [Prior Art] A field emission electron source and the use of the electron source to bombard a glory substance to emit light
將尖端的電子激發出來。 真i環境下’利用外加電場作用 在傳統場發射電子源中，一般採 用微細钥金屬尖端、料端作為電子發射端，隨著奈米技 術的發展，最近還採用碳奈米管作為電子發射端。 理論上，由於权奈米管具有非常小的直徑，很大的長 徑比，因此在外電場作用下其具有很大的場增強因數。惟， 在實際應用中’例如平面型場發射顯示器中，碳奈米管平 面薄膜的整體宏觀場發射增強因數並未能達到單個礙奈米 馨 管的數值’導致發射電壓較高，場發射電流密度小’並且 碳奈米管薄膜等形式之陰極製造工藝較為複雜，成本較高。 【發明内容】 有鑒於此，提供一種發射電流密度大、並且易於組裝、 操作之場發射元件實為必要。 一種二極型場發射像素管，其包括：一個中空殼體’ 該殼體具有一個出光部，該出光部之内壁依次形成有螢光 物質和陽極層，其中：所述殼體内部係真空密封的，並且 該殼體内部與該出光部相對處有一個陰極發射體，該陰極 6 1337370 發射體之尖端為碳奈米線。 相對於先前技術，所述之二極型場發射像素管利用碳 奈米線之優異場發射性能提高了發光輝度，降低了發射電 壓，並且簡化了陰極結構，降低了製造難度和成本。 【實施方式】 以下將結合附圖對本發明作進一步之詳細說明。 本實施例提供一種二極型場發射像素管，請參閱圖1’ 該場發射像素管10包括一個中空殼體12，該殼體12具有 一個出光部120，該出光部之内壁依次形成有螢光物質14 和陽極層16，該殼體12内部與該出光部120相對處有一 陰極發射體18 ’該陰極發射體is之尖端為碳奈米線18〇。 該设體12内部係真空密封的，在本實施例中，該殼體 為中空圓柱體，且該殼體之材料為石英石或玻璃。可以理 解的係，該殼體還可以係中空立方體、三棱柱或其他多邊 形棱柱，同時該殼體的出光面可以為平面也可以為球面或 非球面，本領域技術人員可以根據實際情況進行選擇。 所述螢光物質14沈積在出光部12〇的内壁上，該營光 物質14可以為白色螢光粉，也可以為彩色螢光粉，例如紅 色、綠色、藍色螢光粉等，當電子轟擊螢光物質14時可發 出白色或彩色可見光。所述陽極層16鍍在沈積有營光物質 14之出光部120内壁上並將螢光物質14覆蓋，起到導電 的作用。該陽極層16為鋁膜，具有良好的導電性。 所述陰極發射體18包括一陰極支撐杈182，該陰極 撐杈182垂直於出光部120。該陰極支樓柱182為一 ▲ 7 1337370 .導電、導熱並具有一定強度之金屬絲，在 極支標柱！82為銅絲。 在本實化例中該陰 所述碳奈米線18〇之長度為0.1毫米至1〇 ^ π 為1微求至1毫米。該碳奈米、線180在裝入像^^ 用酒精浸泡’然後在真空中通以電流進行熱處理' 用銀膠枯在支#柱182正對陽極層16之端部。^ 驟處理後之碳奈米線18G導電性和機械性都 ： 該場發射像素管10進一步包括一個陽極電極二二 個陰極電極22。該陽極電極2G與陽極層16 所述殼體12延伸至殼體12外部。該陰極電極& _ = 射體18電連接並穿過殼體12延伸至殼冑12 二 Γ:::殼 該場發射像素管1G進—步包括—吸氣劑24，用於吸 附場發射像素管内殘餘氣體’維持場發射像素管之 空度。該吸氣劑24可以為蒸散型吸氣劑金屬薄膜，於體 12封接後通過高頻加熱紐的方式形成於靠靜極r極 22的殼體12内壁上。鍍膜時需保證該吸氣劑薄膜 覆蓋到陽極層16 ’也不會造成陽極電極 極 之間的短路。該域劑24咖為非咖= 電 在靠近陰極電極22之殼體12的内壁上。 “ 該場發射像素管1〇進一步包括— 孔26外接真空泵’用以將殼體12抽真空以封^時該= 過排氣孔26使場發射像素管1()達到—定的真空度後再進 1337370 行最後的封裝。 當該場發射像素管10工作時，給陽極電極22和陰極 電極24之間加上電壓形成電場，通過電場作用將陰極發射 體18尖端即碳奈米線18〇發射出電子，電子穿透陽極層 16轟擊螢光物質14,發出可見光。巧*見光一部分直接從出 光部120射出，一部分射在陽極層16上，陽極層16將其 反射並最終透過出光部射出。多個這樣的場發射像素管1〇 排列起來就可以用來照明或資訊顯示。 相對於先則技術，所述之二極型場發射像素管利用碳 奈米線的優異場發射性能提高了發光輝度’降低了發射電 壓，並且簡化了陰極結構，降低了製造難度和成本。 综上所述，本發明符合發明專利要件，爰依法提出專 利申請。惟，以上所述者僅為本發明之較佳實施方式，本 發明之範圍並不以上述實施方式為限，舉凡熟習本案技藝 之人士援依本發明之精神所作之等效修飾或變化，皆應涵 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之二極型場發射像素管之示 意圖。 【主要元件符號說明】 二極型場發射像素管 10 出光部 120 殼體 12 螢光物質 14 陽極層 16 陰極發射體 18 碳奈米線 180 支撐柱 182 9 1337370 陽極電極 20 陰極電極 22 吸氣劑 24 排氣孔 26Exciting the tip of the electrons. In the real environment, the external electric field is used in the traditional field emission electron source. The micro-key metal tip and the material end are generally used as the electron emission end. With the development of nanotechnology, the carbon nanotube tube has recently been used as the electron emission end. . Theoretically, since the nanotubes have a very small diameter and a large aspect ratio, they have a large field enhancement factor under the action of an external electric field. However, in practical applications, for example, in a flat field emission display, the overall macroscopic field emission enhancement factor of the carbon nanotube flat film fails to reach the value of a single nucleus tube, resulting in a higher emission voltage and field emission current. The cathode manufacturing process in the form of a small density 'and a carbon nanotube film is complicated and costly. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a field emission device that has a large emission current density and is easy to assemble and operate. A two-pole field emission pixel tube includes: a hollow housing'. The housing has a light exiting portion, and an inner wall of the light exiting portion is sequentially formed with a fluorescent substance and an anode layer, wherein: the inside of the housing is vacuum Sealed, and a cathode emitter is disposed inside the casing opposite to the light exiting portion, and the tip end of the cathode 6 1337370 is a carbon nanowire. Compared with the prior art, the diode-type field emission pixel tube utilizes the excellent field emission performance of the carbon nanowire to improve the luminance, reduce the emission voltage, and simplify the cathode structure, thereby reducing manufacturing difficulty and cost. [Embodiment] Hereinafter, the present invention will be further described in detail with reference to the accompanying drawings. The present embodiment provides a diode-type field emission pixel tube. Please refer to FIG. 1 '. The field emission pixel tube 10 includes a hollow housing 12 having a light exit portion 120. The inner wall of the light exit portion is sequentially formed. The phosphor material 14 and the anode layer 16 have a cathode emitter 18' opposite to the light exit portion 120. The tip of the cathode emitter is a carbon nanotube line 18A. The interior of the housing 12 is vacuum sealed. In this embodiment, the housing is a hollow cylinder, and the material of the housing is quartz stone or glass. It can be understood that the housing can also be a hollow cube, a triangular prism or other polygonal prisms, and the light-emitting surface of the housing can be a flat surface or a spherical surface or an aspheric surface, and can be selected by a person skilled in the art according to actual conditions. The phosphor material 14 is deposited on the inner wall of the light exit portion 12, and the camping material 14 may be white phosphor powder or color phosphor powder, such as red, green, blue phosphor powder, etc. White or colored visible light can be emitted when bombarding the fluorescent substance 14. The anode layer 16 is plated on the inner wall of the light exit portion 120 on which the camping material 14 is deposited and covers the phosphor material 14 to function as a conductive. The anode layer 16 is an aluminum film and has good electrical conductivity. The cathode emitter 18 includes a cathode support 182 that is perpendicular to the light exit portion 120. The cathode branch column 182 is a ▲ 7 1337370. Conductive, thermally conductive and a certain strength of the wire, in the pole column! 82 is a copper wire. In the embodiment, the length of the negative carbon nanowire 18 为 is 0.1 mm to 1 〇 ^ π is 1 micro-to 1 mm. The carbon nanowire, line 180 is immersed in an alcohol-like state and then subjected to a heat treatment in a vacuum, and is dried with silver paste at the end of the column 182 opposite the anode layer 16. ^ Sublimed carbon nanowire 18G conductivity and mechanical properties: The field emission pixel tube 10 further includes an anode electrode and two cathode electrodes 22. The anode electrode 2G and the anode layer 16 extend from the housing 12 to the outside of the housing 12. The cathode electrode & _ = the emitter 18 is electrically connected and extends through the housing 12 to the shell 12. The second::: shell. The field emission pixel tube 1G further includes a getter 24 for adsorbing field emission. The residual gas in the pixel tube 'maintains the vacancy of the field emission pixel tube. The getter 24 may be an evaporable getter metal film which is formed on the inner wall of the casing 12 of the static pole r pole 22 by means of a high frequency heating button after the body 12 is sealed. It is necessary to ensure that the getter film covers the anode layer 16' during the coating without causing a short circuit between the anode electrodes. The domain agent 24 is non-coffee = electrically on the inner wall of the casing 12 adjacent to the cathode electrode 22. The field emission pixel tube 1 further includes a hole 26 externally connected to the vacuum pump for evacuating the casing 12 to seal the time = the exhaust hole 26 causes the field emission pixel tube 1 () to reach a predetermined degree of vacuum Further, the final package is carried out in 1337370. When the field emission pixel tube 10 is operated, a voltage is applied between the anode electrode 22 and the cathode electrode 24 to form an electric field, and the tip end of the cathode emitter 18, that is, the carbon nanowire 18, is applied by an electric field. The electrons are emitted, and the electrons penetrate the anode layer 16 to bombard the phosphor material 14 to emit visible light. A part of the light is directly emitted from the light exit portion 120, and a portion is incident on the anode layer 16, and the anode layer 16 reflects the light and finally passes through the light exit portion. A plurality of such field emission pixel tubes 1 are arranged to be used for illumination or information display. Compared with the prior art, the two-pole field emission pixel tube utilizes the excellent field emission performance of the carbon nanowire. The illuminance of the luminescence reduces the emission voltage and simplifies the cathode structure, which reduces the manufacturing difficulty and cost. In summary, the invention complies with the invention patent requirements, and patents are filed according to law. The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention should be covered. BRIEF DESCRIPTION OF THE DRAWINGS [FIG. 1] FIG. 1 is a schematic diagram of a two-pole field emission pixel tube according to an embodiment of the present invention. [Main element symbol description] Dipole field emission pixel tube 10 light exit portion 120 shell Body 12 Fluorescent material 14 Anode layer 16 Cathode emitter 18 Carbon nanowire 180 Support column 182 9 1337370 Anode electrode 20 Cathode electrode 22 Getter 24 Vent hole 26
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