1337368 九、發明說明: 【發明所屬之技術領域】 本發明係關於一種場發射燈,特別係有關於一種使用 於液晶顯示裝置的背光燈之平面發光型場發射燈。 【先前技術】 習知液晶顯示裝置的背光光源多使用冷陰極螢光燈。 但螢光燈發光效率不高,所以能量損失大。此外,螢光 燈因使用水銀,使用過的螢光燈若不被適當地處理,將 危害環境。因此,無上述缺點的場發射燈作為液晶顯示 裝置的背光燈的實施例就顯得格外受嗯目。 列舉幾個並簡單地說明如 習知的場發射燈之實施例 后。請參考圖8(a)所示燈源為場發射燈為三極管構造之 剖示圖。此燈源係作為投射型液晶顯示裝置的投射器光 源使用。圖8(b)所示側視圖的場發射燈請參考參考文獻i 。一奈米碳薄膜108以化學蒸鍍法形成於陰極導體上。此 奈米碳管或石墨奈米結晶等薄膜可高效率地放射出冷陰 極電子。圖8(c)所示場發射燈的剖示圖請參考專利文獻】 。該燈管120為2極管或3極管構造之場發射燈。從燈管容器内 側或下側可以連接各電極,所以,可將各燈管相互接近配置。 由於從燈管120内部與下方可遠植久带技& rJ連接各電極,所以每個燈源 可互相靠近配置。 圖8(d)所示場發射燈的側視圖揭示於專利文獻2。係一 奈米碳管(CNT)的場發射電極亮燈之平面㈣色燈4 -6· 1337368BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field emission lamp, and more particularly to a planar light-emitting field emission lamp for a backlight used in a liquid crystal display device. [Prior Art] Conventionally, a backlight source of a liquid crystal display device uses a cold cathode fluorescent lamp. However, the fluorescent lamp has low luminous efficiency, so the energy loss is large. In addition, due to the use of mercury in fluorescent lamps, used fluorescent lamps, if not properly treated, will endanger the environment. Therefore, the field emission lamp which does not have the above disadvantages is particularly advantageous as an embodiment of the backlight of the liquid crystal display device. A few and briefly illustrate embodiments of conventional field emission lamps. Please refer to Fig. 8(a) for a diagram showing the lamp source as a triode structure. This light source is used as a projector light source of a projection type liquid crystal display device. For the field emission lamp of the side view shown in Figure 8(b), please refer to reference i. A nano carbon film 108 is formed on the cathode conductor by chemical vapor deposition. This thin film such as a carbon nanotube or a graphite nanocrystal can efficiently emit cold cathode electrons. For a cross-sectional view of the field emission lamp shown in Fig. 8(c), please refer to the patent literature. The lamp tube 120 is a field emission lamp constructed in a 2-pole tube or a 3-pole tube. The electrodes can be connected from the inside or the lower side of the tube container, so that the tubes can be placed close to each other. Since the electrodes can be connected from the inside of the tube 120 to the lower side and the electrodes can be connected to each other, each of the lamps can be arranged close to each other. A side view of the field emission lamp shown in Fig. 8(d) is disclosed in Patent Document 2. The plane of the field emission electrode of a carbon nanotube (CNT) is illuminated (four) color lamp 4 -6· 1337368
係ί二個間隔開的燈泡室所構成。於基板 ,成射極層°基板上有三個營光體105R、105g、105B 於各螢光體係以奈米管射極層所射出的電子產生红綠 2的三原色光。奈米管射極層,係以碳或鑽石等条米尺 寸的中空纖維與黏合劑聚料以網印法形成。這是二種低 成本法。平面型彩色燈可被應用於液晶顯示裝置的背光 燈,如此,液晶顯示裝置將可小型化且低成本。圖9⑷ 所不剖示圖的場發射燈揭示於參考文獻2。玻璃-石夕⑸ 玻璃構造及玻璃-玻璃構造可藉由靜電接著法形成。利用 此方法,將矽基板的電場放射元件配列密封於真空容器 中’構成場發射燈。 專利文獻3、4,係如圖9 (b)所示,揭示一種利用場發 射陣列,具有照明像素之液晶顯示裝置。此場發射陣列 係為了個別照明各個像素而使用。亦可利用於照明整 個顯示裝置之背光燈。場發射陣列利用於背光燈之液晶 顯示裝置,其與使用螢光燈之情形比較,將更小型、發 光效率與輝度皆尚、哥命長。此場發射陣列,由於可產 生所有顏色的光,所以液晶顯示裝置不需使用濾光片。 專利文獻1美國專利第6008595號說明書 專利文獻2美國專利第6U6 5 90號說明書 專利文獻3美國專利第5646702號說明書 專利文獻4特表平第10_508120號公報 非專利文獻 1 A. N. Obraztsov, et al·;,,Field emission 1337368 characteristics of nano structured thin film carbon materials”,Applied Surface Science 215,(2003) 214-221. 非專利文獻 2 D. J. Lee et al.; ’’Vacuum Sealing ofField -Emission Arrays Using Field-Assisted Bonding Method”, SID’98, 589-592,(1 998). 非專利文獻 3 A. N. Obraztsov, et al.; ”CVD growth and field emission properties of nanostructured carbon films”,J. Phys. D; Appl. Phys. 35,(2002) 357-362· 非專利文獻 4 A. N. Obraztsov,et al.; "Chemical vapor deposition of carbon films: in-situ plasma diagnostics”,The system consists of two spaced apart bulb chambers. On the substrate and the emitter layer, three campers 105R, 105g, and 105B are generated in the respective phosphor systems by the electrons emitted from the emitter layer of the nanotubes to generate red and green three primary colors. The emitter layer of the nanotube tube is formed by screen printing using a hollow fiber of a meter size such as carbon or diamond and a binder. This is two low cost methods. The flat type color lamp can be applied to a backlight of a liquid crystal display device, and thus, the liquid crystal display device can be miniaturized and low in cost. The field emission lamp of Fig. 9(4), which is not shown in the drawings, is disclosed in reference 2. Glass-Shi Xi (5) The glass structure and the glass-glass structure can be formed by electrostatic bonding. With this method, the electric field radiating element of the crucible substrate is arranged in a sealed manner in a vacuum vessel to constitute a field emission lamp. Patent Documents 3 and 4, as shown in Fig. 9(b), disclose a liquid crystal display device having illumination pixels for use in a field emission array. This field emission array is used to individually illuminate individual pixels. It can also be used to illuminate the backlight of the entire display unit. The field emission array is used for a liquid crystal display device of a backlight, which is smaller, has a higher luminous efficiency and brightness than a fluorescent lamp, and has a long life. This field emission array does not require the use of a filter because it can produce light of all colors. Patent Document 1 US Patent No. 6008595 Patent Document 2 US Patent No. 6U6 5 90 Specification Patent Document 3 US Patent No. 5,664,702 Patent Document 4 Special Table No. 10_508120 Non-Patent Document 1 AN Obraztsov, et al. , Field emission 1337368 characteristics of nano structured thin film carbon materials”, Applied Surface Science 215, (2003) 214-221. Non-Patent Document 2 DJ Lee et al.; ''Vacuum Sealing of Field - Emission Arrays Using Field-Assisted Bonding Method", SID'98, 589-592, (1 998). Non-Patent Document 3 AN Obraztsov, et al.; "CVD growth and field emission properties of nanostructured carbon films", J. Phys. D; Appl. Phys. 35, (2002) 357-362. Non-patent literature 4 AN Obraztsov, et al.; "Chemical vapor deposition of carbon films: in-situ plasma diagnostics",
Carbon 41 (2003), 836-839.Carbon 41 (2003), 836-839.
明 谷 J 本發明之一目㈣用以解決如上所述傳統方法的問題 。傳統的場發射燈,其利用於液晶顯示裝置之平面發光 燈時有壽命不長之問題。這是因爲平面狀發光燈,^射 :子之射極為點狀’所以陰極的電流密度大,沉重的負 荷造成壽命短。而亘古旦A人α A 、 圓筒狀hi田 線狀陰極燈,發光面為 固请狀’其利用於液晶顯示裝置的背光燈時,厚度太厚 :本:明之目的即在於解決上述之習知技術上的問: 以使知液晶顯示裝f帛# > $ & ^ 實現。 $置用岐之平面型場發射燈長壽命得以 為了解決上述課題,本 發月揭不一種場發射燈其構 -8- 造至少包含平面狀的陰極側玻璃基板、陰極側玻璃基板 上平行排列的複數條直線狀陰極導體、陰極側玻璃基板 對面方向所配置、對應各陰極導體溝漕的陽極側玻璃基 板、溝漕所设置的陽極導體、塗佈於陽極導體上的螢光 體、及收藏陰極側玻璃基板與陽極側玻璃基板的真空容 器。此外,陰極導體的陽極側表面係藉由CVD法形成碳 皮膜。 本發明藉由如上述之構造,可實現最適合液晶顯示裝 置背光燈用途之長壽命平面發光型場發射燈。 【實施方式】 有關本發明之較佳實施例1,請參照圖1〜圖3,本發明 係以場發射燈為實施例,其係在平面狀陰極側玻璃基板 上配置複數條直線狀陰極導体再以CVD法形成碳皮膜形 成於其上,而面對該陰極玻璃基板之陽極板上則設置有 對應於各陰極導體之溝漕’而該溝漕内設有陽極導體, 並將螢光體塗抹於該陽極導體上,一真空容器則容置該 陰極側玻璃基板與陽極側玻璃板。 說明本發明實施例1之場發射燈的構造與製法。圖1為 本發明實施例之場發射燈的立體圖與部分剖視圖。圖 2(a)為場發射燈的部分橫截面示意圖,圖2(b)為場發射燈 的部分橫戴面示意圖。圖3為場發射燈的俯視示意圖,各 β分的比率專與貫際並不完全相同。於圖1〜圖3,陰極 側玻璃基板I為一平面狀玻璃基板。陽極側玻璃基板2為 1337368 具有溝漕的玻璃基板。陽極側玻璃基板2與陰極側玻璃基 板】對向配置。陰極導體3為陰極側玻璃基板上平行排列 的直線狀電極。陽極導體4為蒸鍵於溝漕的紹電極。螢& 體5塗佈於為陽極導體上。陰極側玻璃基板與陽極側玻$ .. 基板再封裝於一真空容器6。溝漕7係為了設置陽極而% 成於陽極側玻璃基板2。碳皮膜8係為了提高電子放射效 率而藉由CVD法於陰極導體上。 於平面狀陰極側玻璃基板丨上,等間隔平行排列複數條 # 直線狀的鎳(Ni)之陰極導體3。陰極導體3除了犯之外, 亦可使用鐵(Fe)或銅(Cu)等。相對於溝漕7的尺寸,陰極 導體3的粗細相當細’將使光線均勾地放射。為使輝度相 同,亦可使用散光板或偏光板。於陰極導體3的陽極側表 · 面藉由CVD法形成石墨的碳皮膜8。碳皮膜8的厚度為2 ^ 〜3em。適當地控制CVD法的條件,將可使陰極導體3 厌皮膜8的電子放射點密度為1 〇7/ cm2。有關c vD法形 成碳皮膜的方法’可參照非專利文獻丨或非專利文獻域 非專利文獻4等。 響 、溝漕7設置於陽極側玻璃基板2且對應各陰極導體3。於 溝漕7上則蒸鍍鋁以形成陽極導體4。陽極導體4的厚度為 1〜2 // m。陽極導體兼具反射板之功能。於陽極導體4, 塗佈可產生白光的螢光體5 ^螢光體的厚度為5〜7#m。 榮光體’其於低電壓用途時使用ZnG2CdQ8S:Ag,α(紅) 、Zn〇.62Cd0.98S:Ag’ C1(綠)、ZnS:Ag,八丨(藍)。於高電壓 -10- 1337368 用途時使用 Y2〇3:Eu(紅)、Gd202S:Tb(綠)、ZnS:Ag(藍) 〇 陰極導體3與陽極導體4的電極間距離約為1〇〜20"m ,亦可擴大至1 0mm左右。因此,溝漕7的尺寸將與其相 同程度。再使陰極側玻璃基板】與陽極側玻璃基板2密接 ’容置於真空容器6。亦可不使用真空容器6,直接熔接 陰極側玻璃基板1與陽極側玻璃基板2,使其真空後崈封 。真空度為丨〇-丨〜1〇·3 t〇rr。整體大小約為i〇cmxi〇cm 左右’亦可擴大至丨mxirn左右。 說明如上述所構成的本發明實施例之場發射燈的動作 。於陰極導體3與陽極導體4間供給單極性的脈衝電壓。 電壓為250〜500V’電流約為lmA。電壓亦可提高至1〇kv 左右。頻率為5kHz。脈衝寬度為3〜8" sec。開始放 電電壓為IV/ 陰極的電流密度為】〇〇mA/cm2(i〇v / // m時)。允燈用電源的基本構造可與先前的場發射 燈的構造相同。亮燈用電源,其可設置一組陰極導體3 與陽極導體4、或對各複數組分別設置陰極導體3與陽極 導體4,亦可對所有組設置一共通的陰極導體]與陽極 體4 〇 對陰極導體3與陽極導體4間供給電壓時,從陰椏導體3 上的碳皮膜,藉由電場放射,飛出冷陰極電子,撞擊螢 光體5,進而產生光。從螢光體5所產生的光,係從陰極 側玻璃基板1直接射出,與同時於陽極導體4反射而=陰 1337368 極側玻璃基板1射出。輝度,其單色約為二十萬cd/m2 ,白色約為三萬cd/ m2。發光效率約為30%。燈的壽命 約五萬小時。如上述構造’發光面為平面狀,將可增加 場放射燈之舞命。 如上所述,本發明實施例1係一種場發射燈,其構造為 於平面狀陰極側玻璃基板上,平行配複數條直線狀陰極 導體再藉由CVD法形成碳皮膜;於陰極惻玻璃基板對向 配置的陽極側玻璃基板設置對應各陰極導體的溝漕;於 溝漕設置陽極導體;於陽極導體上塗佈螢光體;於真空 容器收藏陰極側玻璃基板與陽極側玻璃基板。此將可實 現液晶顯示裝置用途的長壽命背光燈。 本發明之貫施例2,為一場發射燈,其在平面型陰極 側玻璃基板上,格子狀配置有複數個直線狀陰極導體再 以CVD法將碳皮膜形成於表面,在與陰極側玻璃基板對 向配置之陽極側玻璃基板設置透明陽極導體,在陽極導 體上之一面塗佈螢光體、將陰極側玻璃基板及陽極側玻 璃基板收容於真空容器中。 、 以下說明本發明之實施例2的場發射燈之構造與製 法二,4為本發明之實施例2之場發射燈的俯視圖與橫截 面示思圖與立體圖。圖4 ( a )為陰極側玻璃基板之俯視 =。®1( b )為陰極側玻璃基板與陽極側玻璃基板之橫 其,不t圖。圖4 ( C )為陰極侧玻璃基板與陽極側玻璃 二反之桜戴面示意圖。這些均為示意圖,各部比例等與 貫際並不相同。 〃 在圖4中’陰極側玻璃基板1,為平面型之玻璃基板 •12-Ming Gu J. One of the inventions (4) is to solve the problems of the conventional method as described above. The conventional field emission lamp has a problem that the life of the liquid crystal display device is not long when it is used. This is because the planar light-emitting lamp has a very high current density, and the heavy load causes a short life. The 亘古旦 A person α A , the cylindrical hi field linear cathode lamp, the light-emitting surface is a solid shape. When it is used in the backlight of a liquid crystal display device, the thickness is too thick: the purpose of the present invention is to solve the above-mentioned habits. Know the technical question: In order to make the LCD display device f帛# > $ & ^ implementation. The long life of the flat field emission lamp used for the purpose of solving the above problem is not disclosed in this month. A field emission lamp is constructed in a manner that comprises at least a planar cathode-side glass substrate and a cathode-side glass substrate arranged in parallel. a plurality of linear cathode conductors, a cathode side glass substrate disposed in a direction opposite to each other, an anode side glass substrate corresponding to each cathode conductor groove, an anode conductor provided in the groove, a phosphor coated on the anode conductor, and a collection A vacuum container for the cathode side glass substrate and the anode side glass substrate. Further, the anode side surface of the cathode conductor is formed into a carbon film by a CVD method. According to the present invention, the long-life planar light-emitting field emission lamp which is most suitable for the backlight of a liquid crystal display device can be realized by the above configuration. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1 to FIG. 3, a field emission lamp is used as an embodiment in which a plurality of linear cathode conductors are disposed on a planar cathode side glass substrate. Forming a carbon film on the cathode film by a CVD method, and providing an anode conductor corresponding to each cathode conductor on the anode plate facing the cathode glass substrate, and providing an anode conductor in the trench The anode conductor is coated on the anode conductor, and the vacuum side container accommodates the cathode side glass substrate and the anode side glass plate. The construction and manufacturing method of the field emission lamp of Embodiment 1 of the present invention will be described. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view and a partial cross-sectional view of a field emission lamp in accordance with an embodiment of the present invention. Fig. 2(a) is a partial cross-sectional view of the field emission lamp, and Fig. 2(b) is a partial cross-sectional view of the field emission lamp. Fig. 3 is a top plan view of the field emission lamp, and the ratio of each β point is not exactly the same as the continuity. In Figs. 1 to 3, the cathode side glass substrate I is a flat glass substrate. The anode side glass substrate 2 is a 1337368 glass substrate having a gully. The anode side glass substrate 2 and the cathode side glass substrate are disposed opposite to each other. The cathode conductor 3 is a linear electrode arranged in parallel on the cathode side glass substrate. The anode conductor 4 is a drain electrode that is steamed to the gully. The firefly & body 5 is coated on an anode conductor. The cathode side glass substrate and the anode side glass are further packaged in a vacuum container 6. The gully 7 is formed on the anode-side glass substrate 2 in order to provide an anode. The carbon film 8 is formed on the cathode conductor by a CVD method in order to improve electron emission efficiency. On the planar cathode-side glass substrate, a plurality of linear nickel (Ni) cathode conductors 3 are arranged in parallel at equal intervals. In addition to the cathode conductor 3, iron (Fe), copper (Cu), or the like can be used. With respect to the size of the gully 7, the thickness of the cathode conductor 3 is relatively thin, which will cause the light to be radiated. For the same brightness, a diffuser or a polarizing plate can also be used. A carbon film 8 of graphite is formed on the anode side surface of the cathode conductor 3 by a CVD method. The carbon film 8 has a thickness of 2 ^ 3 to 3 cm. By appropriately controlling the conditions of the CVD method, the electron emission point density of the anode conductor 8 of the cathode conductor 3 can be made 1 〇 7 / cm 2 . The method for forming a carbon film by the c vD method can be referred to the non-patent document 非 or the non-patent literature field non-patent document 4 or the like. The ring and the groove 7 are provided on the anode side glass substrate 2 and correspond to the respective cathode conductors 3. On the gully 7, aluminum is vapor-deposited to form the anode conductor 4. The thickness of the anode conductor 4 is 1 to 2 // m. The anode conductor also functions as a reflector. The thickness of the phosphor 5 ^ phosphor which is applied to the anode conductor 4 to produce white light is 5 to 7 #m. The glory body uses ZnG2CdQ8S: Ag, α (red), Zn〇.62Cd0.98S: Ag' C1 (green), ZnS: Ag, gossip (blue) for low voltage applications. For high voltage -10- 1337368 use Y2〇3:Eu (red), Gd202S:Tb (green), ZnS:Ag (blue) 〇The distance between the cathode conductor 3 and the anode conductor 4 is about 1〇~20" ;m can also be expanded to about 10 mm. Therefore, the size of the gully 7 will be the same. Further, the cathode side glass substrate is placed in close contact with the anode side glass substrate 2 and placed in the vacuum vessel 6. Alternatively, the cathode side glass substrate 1 and the anode side glass substrate 2 may be directly welded without using the vacuum container 6, and vacuum-sealed. The degree of vacuum is 丨〇-丨~1〇·3 t〇rr. The overall size is about i〇cmxi〇cm or so, and it can be expanded to about 丨mxirn. The operation of the field emission lamp of the embodiment of the present invention constructed as described above will be explained. A unipolar pulse voltage is supplied between the cathode conductor 3 and the anode conductor 4. The voltage is 250~500V' current is about lmA. The voltage can also be increased to around 1〇kv. The frequency is 5 kHz. The pulse width is 3~8" sec. The current discharge voltage at the beginning of the IV/cathode is 〇〇mA/cm2 (i〇v / // m). The basic configuration of the power supply for the lamp can be the same as that of the previous field emission lamp. A power supply for lighting, which may be provided with a set of cathode conductor 3 and anode conductor 4, or a cathode conductor 3 and an anode conductor 4 for each complex array, or a common cathode conductor and anode body for all groups. When a voltage is supplied between the cathode conductor 3 and the anode conductor 4, the carbon film on the cathode conductor 3 is radiated by the electric field, and the cold cathode electrons are emitted to hit the phosphor 5 to generate light. The light generated from the phosphor 5 is directly emitted from the cathode-side glass substrate 1, and is simultaneously emitted from the anode conductor 4 and is output to the cathode side glass substrate 1. The luminance has a monochrome of about 200,000 cd/m2 and a white color of about 30,000 cd/m2. The luminous efficiency is about 30%. The life of the lamp is about 50,000 hours. As described above, the light-emitting surface is planar, which increases the life of the field radiation lamp. As described above, Embodiment 1 of the present invention is a field emission lamp which is configured to form a carbon film on a planar cathode side glass substrate by a plurality of linear cathode conductors in parallel and a carbon film by a CVD method; A groove corresponding to each cathode conductor is disposed on the disposed anode side glass substrate; an anode conductor is disposed on the groove; a phosphor is coated on the anode conductor; and a cathode side glass substrate and an anode side glass substrate are stored in the vacuum container. This will enable long life backlights for liquid crystal display applications. Embodiment 2 of the present invention is a field emission lamp in which a plurality of linear cathode conductors are arranged in a lattice shape on a planar cathode side glass substrate, and a carbon film is formed on the surface by a CVD method, and a cathode side glass substrate A transparent anode conductor is disposed on the anode-side glass substrate disposed, and a phosphor is coated on one surface of the anode conductor, and the cathode-side glass substrate and the anode-side glass substrate are housed in a vacuum container. The structure and method 2 of the field emission lamp of Embodiment 2 of the present invention will now be described. 4 is a plan view, a cross-sectional view and a perspective view of a field emission lamp of Embodiment 2 of the present invention. Figure 4 (a) is a top view of the cathode side glass substrate. ®1(b) is a transverse direction between the cathode side glass substrate and the anode side glass substrate. Figure 4 (C) is a schematic view of the cathode side glass substrate and the anode side glass. These are schematic diagrams, and the proportions of the various sections are not the same as the ones. 〃 In Figure 4, the cathode side glass substrate 1 is a flat glass substrate.