200819883 九、發明說明： 【發明所屬之技術領域】 本發明係有關一種平面燈源，特別是一種顯示哭之平面 燈源。 w 【先前技術】 平面燈源因具有均勻性且能夠提供大面積的面光源，已被廣泛 的應用作為顯示面板的背光源。習知一種平面燈源如第i圖所示兴包 含上、下二基板12、14，複數金屬電極16形成於;某板14 上，一介電層18設置於下基板14的上表面並覆蓋^ 電極16,介電層18的上表面及上基板12的下表面分別塗佈 一螢光層20(fluorescent layer)。另於上、下基板12、14之間 設置複數間隔壁22(spacei·)，並有放電氣體（圖中未示）填充於 上、下基板12、14之間’藉由金屬電極16充電以電離放電氣體， 被％離之放電氣體經能1轉移以產生紫外線，之後利用紫外線激發螢 光層20而產生白光。 ^ 隨著顯示面板往大尺寸的方向發展，搭配平面燈源為一降低成本 的方法，然而上述之平面燈源的發光效率仍不足以當背光使用，無法 滿足現今追求高發光效率的要求。 【發明内容】 為了解決上述問題，本發明目的之一係提出一種具有奈 米石反官設計之平面燈源，利用奈米碳管（Carb〇n Nan〇 Tube， CNT)的場發射特性，在相同的驅動電壓下，使產生更多的電 離之放電氣體及紫外線，以達到增加亮度的功效。 5 200819883 本杳月目的之一係提供一種平面燈源，具有省電之優 點0 •為了達到上述目的，本發明一實施例之平面燈源，包 ^ ·· 一上基板，其下表面設置H光層；-下基板設置於上基 2下方上基板與下基板之間形成一放電空間，下基板包括至少一 I極對叹置在下基板之上表面；_介電層覆蓋電極對；-奈米碳管 層設置在該介電層上；及n光層妓在下基板的上表面、介 電層及奈米碳管層之側壁上；以及—氣體充填在放電空間中。 ^本發明另一實施例之平面燈源，包括一上基板；一下基板 «又置於上基板下方且形成_放電空間；至少—電㈣憤置在下基板 之上表面；至少一電極設置在上基板之下表面且對應於電極對之 間，介電層覆蓋電極對與電極；一奈米碳管層設置在介電層上； 螢光層ηχ置在上基板及下基板之相對表面、介電層及奈米碳管層 之側壁上；以及一氣體充填在放電空間中。 【實施方式】 第2圖所示為本發明一實施例平面燈源之剖面結構示意 圖。於本實施例中，一平面燈源3〇包含一上基板32及一下 基板34，上、下基板32、34係相對設置並形成一放電空間 35，且放電空間35中填充有放電氣體（圖中未示），一般為使 用h性氣體’於上基板32的下表面設置一第一勞光層43， 又下基板34包括至少一金屬電極對36、36,設置於下基板34 之上表面；一介電層38覆蓋於對應的金屬電極對36、36,上， 用來保護並隔絕金屬電極對36、36,； 一奈米碳管層40係設 置在介電層38的表面，其中奈米碳管層40係由介電層材料及 奈米碳管粉末等物質混合而成，使得奈米碳管粉末能夠直接接觸放電 200819883 氣體，並有一第二螢光層44設置於下基板34未覆蓋介電層38的 上表面、介電層38及奈米碳管層40的相對二側壁。 接續上述說明，介電層38的厚度小於或等於300微米， 而奈米碳管層40的厚度為5微米至300微米，且奈米碳管層 40之奈米碳管粉末及介電層材料的重量比為100:1至 1:100000，其中介電層材料係由玻璃陶瓷材料，如氧化矽或 氧化鉛等金屬氧化物，及有機樹脂，如乙基纖維素等混合而 成；另外在上、下基板32、34之間可設置有複數間隔壁（圖 中未示），用來維持上、下基板32、34的固定間距，又上、 下基板32、34常用者為玻璃材質。 由於奈米碳管係呈尖端狀，且能直接接觸到放電氣體， 當金屬電極施加高電壓時，在尖端處會有較多電荷累積，即 有較高之電場，致使附近的放電氣體迅速被電離，放出紫外 光激發螢光層，進而產生白光；藉由此種尖端放電效應，本 發明與傳統一般平面燈源相較，在相同的消耗功率下，本發 明可具有較高之亮度；或在達到相同亮度的前提下，本發明 具有省電之功效。 第3圖為本發明另一實施例平面燈源之剖面結構示意 圖，平面燈源30包含一上基板32及一下基板34，上、下基 板32、34係相對設置並形成一放電空間35，且放電空間35 中填充有放電氣體（圖中未示），一般為使用惰性氣體，於下 基板34之上表面設置至少一金屬電極對36、36’，且上基板 32之下表面設置一金屬電極37位於金屬電極對36、36’之 間，以與金屬電極對36、36’錯開對應，一介電層38分別覆 蓋於金屬電極對36、36’與金屬電極37上，用來保護並隔絕 金屬電極對36、36’與金屬電極37 ; —奈米碳管層40分別設 置在介電層38的表面，其中奈米碳管層40係由介電層材料及 7 200819883 奈米碳管粉末混合而成，使得奈米碳管粉末能夠直接接觸放電氣體， 並有一螢光層45設置於上、下基板32、34未覆蓋介電層38的下、 上表面、介電層38及奈米碳管層40的相對二側壁之表面。 其中，介電層38的厚度小於或等於300微米，而奈米碳管層 40的厚度為5微米至300微米，且奈米碳管層40之奈米碳 管粉末與介電層材料的重量混合比例為100:1至1:100000 ; 此平面燈源的發光原理與上述實施例皆相同，故在此不再贅 述。 上述應用於平面燈源之基板結構，其製作係在一基板依 序形成金屬電極對、介電層後，再覆蓋上一層混有奈米碳管 粉末的奈米碳管層，最後再於基板未覆蓋介電層的表面、介 電層的二側壁及奈米碳管層的二側壁形成螢光層即可。 綜上所述，本發明藉由奈米碳管所具有的尖端結構及其 場發射特性，在相同的驅動電壓下，使產生的電漿及紫外線 增多，以達到增加亮度的功效，進而具有省電之優點。 以上所述之實施例僅係為說明本發明之技術思想及特 點，其目的在使熟習此項技藝之人士能夠瞭解本發明之内容 並據以實施，當不能以之限定本發明之專利範圍，即大凡依 本發明所揭示之精神所作之均等變化或修飾，仍應涵蓋在本 發明之專利範圍内。 【圖式簡單說明】 第1圖所示為習知平面燈源之結構示意圖。 第2圖所示為根據本發明一實施例之剖面結構示意圖。 第3圖所示為根據本發明另一實施例之剖面結構示意圖。 200819883 【主要元件符號說明】 10 平面燈源 12 上基板 14 下基板 16 金屬電極 18 介電層 20 螢光層 22 間隔壁 30 平面燈源 32 上基板 34 下基板 35 放電空間 36、36， 金屬電極對 37 金屬電極 38 介電層 40 奈米碳管層 43 第一螢光層 44 第二螢光層 45 螢光層 9200819883 IX. DESCRIPTION OF THE INVENTION: FIELD OF THE INVENTION The present invention relates to a planar light source, and more particularly to a flat light source for displaying crying. w [Prior Art] The flat light source has been widely used as a backlight for display panels because of its uniformity and ability to provide a large-area surface light source. A planar light source is provided as shown in FIG. i, including upper and lower substrates 12 and 14, and a plurality of metal electrodes 16 are formed on a plate 14 , and a dielectric layer 18 is disposed on the upper surface of the lower substrate 14 and covered. The electrode 16, the upper surface of the dielectric layer 18 and the lower surface of the upper substrate 12 are respectively coated with a fluorescent layer. Further, a plurality of partition walls 22 (spacei·) are disposed between the upper and lower substrates 12 and 14, and a discharge gas (not shown) is filled between the upper and lower substrates 12 and 14 to be charged by the metal electrode 16 The ionized discharge gas is transferred by the discharge gas 1 to generate ultraviolet rays, and then the phosphor layer 20 is excited by ultraviolet rays to generate white light. ^ With the development of the display panel in the direction of large size, the use of a flat light source is a cost-reducing method. However, the above-mentioned planar light source has insufficient luminous efficiency to be used as a backlight, and cannot meet the requirements for high luminous efficiency. SUMMARY OF THE INVENTION In order to solve the above problems, one of the objects of the present invention is to provide a planar light source having a reversed-aquarium design using a field emission characteristic of a carbon nanotube (Carb〇n Nan〇Tube, CNT). Under the same driving voltage, more ionized discharge gas and ultraviolet rays are generated to achieve the effect of increasing brightness. 5 200819883 One of the purposes of this month is to provide a flat light source with the advantages of power saving. 0. In order to achieve the above object, a planar light source according to an embodiment of the present invention includes an upper substrate, and a lower surface is provided with H. a light layer; a lower substrate is disposed between the upper substrate and the lower substrate to form a discharge space, and the lower substrate includes at least one I pole pair on the upper surface of the lower substrate; the dielectric layer covers the electrode pair; The carbon nanotube layer is disposed on the dielectric layer; and the n-light layer is on the upper surface of the lower substrate, the dielectric layer and the sidewall of the carbon nanotube layer; and - the gas is filled in the discharge space. The planar light source of another embodiment of the present invention includes an upper substrate; the lower substrate « is further disposed under the upper substrate and forms a discharge space; at least - the electrical (four) is placed on the upper surface of the lower substrate; at least one electrode is disposed on the upper substrate; a lower surface of the substrate and corresponding to the pair of electrodes, the dielectric layer covers the electrode pair and the electrode; a carbon nanotube layer is disposed on the dielectric layer; the phosphor layer η is disposed on the opposite surface of the upper substrate and the lower substrate, The electrical layer and the sidewall of the carbon nanotube layer; and a gas filled in the discharge space. [Embodiment] Fig. 2 is a schematic cross-sectional view showing a planar light source according to an embodiment of the present invention. In this embodiment, a planar light source 3A includes an upper substrate 32 and a lower substrate 34. The upper and lower substrates 32 and 34 are oppositely disposed and form a discharge space 35, and the discharge space 35 is filled with a discharge gas (Fig. The first working layer 43 is generally disposed on the lower surface of the upper substrate 32, and the lower substrate 34 includes at least one metal electrode pair 36, 36 disposed on the upper surface of the lower substrate 34. A dielectric layer 38 overlies the corresponding pair of metal electrodes 36, 36 for protecting and isolating the pair of metal electrodes 36, 36; a carbon nanotube layer 40 is disposed on the surface of the dielectric layer 38, wherein The carbon nanotube layer 40 is formed by mixing a dielectric layer material and a carbon nanotube powder, so that the carbon nanotube powder can directly contact the discharge 200819883 gas, and a second phosphor layer 44 is disposed on the lower substrate 34. The upper surface of the dielectric layer 38, the dielectric layer 38, and the opposite sidewalls of the carbon nanotube layer 40 are not covered. Following the above description, the thickness of the dielectric layer 38 is less than or equal to 300 micrometers, and the thickness of the carbon nanotube layer 40 is 5 micrometers to 300 micrometers, and the carbon nanotube powder of the carbon nanotube layer 40 and the dielectric layer material. The weight ratio is from 100:1 to 1:100,000, wherein the dielectric layer material is made of a glass ceramic material, such as a metal oxide such as cerium oxide or lead oxide, and an organic resin such as ethyl cellulose; A plurality of partition walls (not shown) may be disposed between the upper and lower substrates 32 and 34 for maintaining a fixed pitch of the upper and lower substrates 32 and 34, and the upper and lower substrates 32 and 34 are usually made of glass. Since the carbon nanotubes are tip-shaped and can directly contact the discharge gas, when a high voltage is applied to the metal electrode, there is more charge accumulation at the tip, that is, a higher electric field, so that the nearby discharge gas is quickly Ionizing, emitting ultraviolet light to excite the phosphor layer to produce white light; by virtue of such tip discharge effect, the present invention can have higher brightness at the same power consumption compared to conventional general planar light sources; or The invention has the effect of saving electricity on the premise of achieving the same brightness. 3 is a cross-sectional structural view of a planar light source according to another embodiment of the present invention. The planar light source 30 includes an upper substrate 32 and a lower substrate 34. The upper and lower substrates 32 and 34 are oppositely disposed and form a discharge space 35, and The discharge space 35 is filled with a discharge gas (not shown), generally using an inert gas, at least one metal electrode pair 36, 36' is disposed on the upper surface of the lower substrate 34, and a metal electrode is disposed on the lower surface of the upper substrate 32. 37 is located between the metal electrode pairs 36, 36' to be offset from the metal electrode pairs 36, 36'. A dielectric layer 38 is respectively covered on the metal electrode pairs 36, 36' and the metal electrode 37 for protection and isolation. The metal electrode pairs 36, 36' and the metal electrode 37; the carbon nanotube layer 40 are respectively disposed on the surface of the dielectric layer 38, wherein the carbon nanotube layer 40 is composed of a dielectric layer material and 7 200819883 carbon nanotube powder The mixture is made so that the carbon nanotube powder can directly contact the discharge gas, and a fluorescent layer 45 is disposed on the lower and upper surfaces of the upper and lower substrates 32, 34 not covering the dielectric layer 38, the dielectric layer 38 and the nano layer a table of opposite side walls of the carbon tube layer 40 . Wherein, the thickness of the dielectric layer 38 is less than or equal to 300 micrometers, and the thickness of the carbon nanotube layer 40 is 5 micrometers to 300 micrometers, and the weight of the carbon nanotube powder and the dielectric layer material of the carbon nanotube layer 40 The mixing ratio is 100:1 to 1:100,000; the principle of illumination of the planar light source is the same as that of the above embodiment, and therefore will not be described herein. The substrate structure applied to the planar light source is formed by sequentially forming a pair of metal electrodes and a dielectric layer on a substrate, and then covering a layer of carbon nanotubes mixed with carbon nanotube powder, and finally on the substrate. The surface of the dielectric layer, the two sidewalls of the dielectric layer, and the two sidewalls of the carbon nanotube layer may be formed to form a phosphor layer. In summary, the present invention utilizes the tip structure of the carbon nanotubes and its field emission characteristics to increase the generated plasma and ultraviolet rays at the same driving voltage to achieve the effect of increasing brightness, thereby saving power. The advantages. The embodiments described above are merely illustrative of the technical spirit and the features of the present invention, and the objects of the present invention can be understood by those skilled in the art, and the scope of the present invention cannot be limited thereto. That is, the equivalent variations or modifications made by the spirit of the present invention should still be included in the scope of the present invention. [Simple description of the drawing] Fig. 1 is a schematic view showing the structure of a conventional planar light source. Fig. 2 is a schematic cross-sectional view showing an embodiment of the present invention. Figure 3 is a schematic cross-sectional view showing another embodiment of the present invention. 200819883 [Main component symbol description] 10 Planar light source 12 Upper substrate 14 Lower substrate 16 Metal electrode 18 Dielectric layer 20 Fluorescent layer 22 Partition wall 30 Flat light source 32 Upper substrate 34 Lower substrate 35 Discharge space 36, 36, Metal electrode Pair 37 metal electrode 38 dielectric layer 40 carbon nanotube layer 43 first phosphor layer 44 second phosphor layer 45 phosphor layer 9