1309740 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種冷陰極螢光燈及背光模組，尤指一 種用於液晶顯示裝置之具均勻出光度之冷陰極螢光燈及採 用該冷陰極螢光燈之背光模組。 【先前技術】 由於液a日顯不面板中之液晶本身不具發光特性，為達 到顯示效果’須給液晶顯示面板提供一背光模組，其功能 在於向液晶顯示面板提供輝度充分且分佈均勻之面光源， 其運作原理為：光線自光源射出後進入導光板，經由導光 板底面之散射單元反射並由導光板之光出射面輸出，配合 擴散板及棱鏡片的增強效果，提供輝度充分且均勾之面光 源分佈。 請參閱第一圖，係一種先前 一種先前技狀冷陰極榮紐^⑽1309740 IX. The invention relates to a cold cathode fluorescent lamp and a backlight module, and more particularly to a cold cathode fluorescent lamp with uniform light output for a liquid crystal display device and The backlight module of the cold cathode fluorescent lamp. [Prior Art] Since the liquid crystal in the panel does not have the light-emitting property itself, in order to achieve the display effect, a backlight module must be provided to the liquid crystal display panel, and the function thereof is to provide the liquid crystal display panel with a sufficient brightness and uniform distribution. The light source, the operation principle is: the light enters the light guide plate after being emitted from the light source, is reflected by the scattering unit on the bottom surface of the light guide plate, and is output by the light exit surface of the light guide plate, and cooperates with the reinforcing effect of the diffusion plate and the prism sheet to provide sufficient brightness and uniform hook The surface light source is distributed. Please refer to the first figure, which is a previous type of prior art cold cathode glory ^ (10)
度权羽，便侍無效贫无段II3光綠出射率低， 燈外壁112射 無法射出，且 老較厚，因而亮 造成冷陰極榮 光燈11中部亮度較高，兩側亮度較低。 $ 請參閱第二圖’係一種先前技術之昔也 月九挺組。該背光 1309740 ί組1包括前述之冷陰極㈣燈11及導光板12。從冷陰極螢 光燈U射出之光線，經過導光板12從其出射面124出射後入 射至擴散板（圖未示）’同時，從導光板u之底面m出射之 ^線被反射板⑽未示）反射而返回導歧㈣，然:後再自 ^出射面124出射並被擴散板轉換成均勻分佈之面光源，最 後再通過稜鏡板（目未示)發射至液晶面板上。 如僅使冷陰極螢光燈之長度與導光板！2長度相同，則 因無效發光段113之存在導致#光模組現暗區⑵，通常Duquan Yu, the waiter is ineffective, the segment II3 light green emission rate is low, the outer wall 112 of the lamp can not be shot, and the old is thicker, so the bright cathode glory 11 has higher brightness in the middle and lower brightness on both sides. $ Please refer to the second figure, which is a group of prior art. The backlight 1309740 ί group 1 includes the aforementioned cold cathode (four) lamp 11 and the light guide plate 12. The light emitted from the cold cathode fluorescent lamp U is emitted from the light exiting surface 124 through the light guide plate 12 and then incident on the diffusing plate (not shown). Meanwhile, the light emitted from the bottom surface m of the light guiding plate u is reflected by the reflecting plate (10). The reflection is returned to the guide (4), but then it is emitted from the exit surface 124 and converted into a uniformly distributed surface light source by the diffusion plate, and finally emitted to the liquid crystal panel through a seesaw (not shown). For example, only the length of the cold cathode fluorescent lamp and the light guide plate! 2 The length is the same, due to the existence of the invalid light-emitting segment 113, the light module is now dark (2), usually
為解決此問題，在裝配背光模組1時會將冷陰極螢光燈U 加長，使有效發光段長度朗應之導光板長度相同，這種 做法使得背光模組整體裝配面積變大，因此，會造成生產 成本上升。 有鑑於此，提供一種具有較高出光均勻度之冷陰極榮 光燈及背光模組實為必要。 【發明内容】 本發明之目的在於提供_種具有較高出光均勾度之 冷陰極螢光燈。 本發明之另一 燈之背光模組。 目的在於提供一種使用上述冷陰極螢光 干乂狂頁他例之冷陰極螢光燈為一封閉玻管， 該玻管内壁塗覆螢光體，玻管填充水銀蒸氣，1中玻管运 端之外表面分別刻有複數V形槽結構，該_槽結構的了] 角為75°〜115°。 —導光板，係用 本發明一較佳實施例之背光模組包括 1309740 以引導光源發出之光束，該導光板包括至少—入射面、一 與入射面相連之出射面及—相對出射面之底面；—位於; 光板光入射面一側之上述之冷陰極螢光燈。 、 職於无剛技術，本發明之優點為 陰極螢光燈出光均勻’從而、;肖m模組之暗影區，使得 光利用率得以提高，且由於冷陰㈣光燈與導光板長度相 同，使得整個背光模組裝配面積減小，成本降低。 【實施方式】 ^ 請參閱第三圖，係本發明冷陰極螢光燈21之剖視圖， 該冷陰極螢光燈21為一封閉玻管215，該玻管内壁2ιι塗覆 螢光體（圖未示）’玻管215内填充水銀蒸氣（圖未示），其中 玻管215兩端之外表面分別刻有複數v形槽214結構。 V形槽214結構均勻分佈’其係藉由精密機械加工而 成或藉由微影蝕刻而製得。該V形槽214之節距L為 10〜20/zm(微米）’其頂角為75。〜115。。其中，該v形槽214 之每一節距L係等距分佈。工作時，光線^自冷陰極螢光燈 玻管内壁211發出，而v形槽214結構與出光面212形成一定 角度，從而減小光線0與出光面212之入射角，當光線^^到達 V形槽214時發生折射自冷陰極螢光燈出光面212射出，降 低了光線在出光面212上發生全反射之情況 ，從而提高了冷 陰極螢光燈21兩端處之出光輝度。 再清參閱第四圖，係本發明之背光模組，該背光模組2 包括本發明之冷陰極螢光燈21及一導光板22。該冷陰極螢 光燈21係用以發出光束’該導光板22引導該冷陰極螢光燈 1309740 21發出光束之傳輸方向，將其轉換為面光源出射。該導光 板22係平板形，採用壓克力、玻璃或聚碳酸酯等透明材質 製成，其包括一入射面221、與入射面221相連之出射面（圖 未示）及與出射面相對之底面223。該入射面221係用以接收 冷陰極螢光燈21發出之光線。導光板22之底面223設置複數 網點224，以提高導光板22出射光線之輝度及均勻性。該網 點224之大小係沿遠離入射面221之方向遞增，其為®球 狀。該網點224亦可為圓柱狀、正方體、金字塔形或其他合 適之形狀。該網點224可以印刷或射出成型等方式分佈於導 光板22之底面223。另，亦可於底面223設置複數V形槽以 替代該複數網點224。 本發明之背光模組可有其他變更設計，例如可在其入 射面上藉由電子束蒸鑛或化學氣相沈積法等方法锻覆一層 增透膜或抗反射膜，為使入射光實現彩色化，可於入射面 鍍覆一層螢光層，底面亦可設有霧狀剔花或咬花以替代該 複數網點，该導光板形狀不限於平板形，亦可為楔形。 由於本發明冷陰極螢光燈兩端無效發光段刻有V形 槽，光線出射，降低了光線全反射的情況，提高冷陰極 螢光燈之出光輝度，且，本發明之冷陰極螢光燈無須另外 加長使有效發光區域與導光板等長，從而減小背光模組體 積，降低生產成本。 綜上所述，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例，本發 明之範圍並不以上述實施例為限，舉凡熟習本案技藝之人 1309740 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】 第一圖係先前技術冷陰極螢光燈之剖面圖。 第二圖係先前技術背光模組之立體圖。 第三圖係本發明冷陰極螢光燈之剖面圖。 第四圖係本發明背光模組之平面圖。 【主要元件符號說明】 導光板 22 冷陰極螢光燈 21 入射面 221 V形槽 214 背光模組 2 底面 223 網點 224 玻管内壁 211 出光面 212 封閉玻管 215 10In order to solve this problem, the cold cathode fluorescent lamp U is lengthened when the backlight module 1 is assembled, so that the length of the effective light-emitting section is the same as that of the light guide plate. This makes the overall assembly area of the backlight module larger. Will cause an increase in production costs. In view of this, it is necessary to provide a cold cathode glory lamp and a backlight module having high light uniformity. SUMMARY OF THE INVENTION An object of the present invention is to provide a cold cathode fluorescent lamp having a high light-emitting uniformity. Another backlight module of the present invention. The purpose of the invention is to provide a cold cathode fluorescent lamp using the above-mentioned cold cathode fluorescent dry sputum as a closed glass tube, the inner wall of the glass tube is coated with a phosphor, the glass tube is filled with mercury vapor, and the middle glass tube is transported. The outer surfaces are engraved with a plurality of V-shaped groove structures respectively, and the angle of the groove structure is 75° to 115°. a light guide plate, wherein the backlight module of the preferred embodiment of the present invention comprises 1309740 for guiding a light beam emitted from a light source, the light guide plate comprising at least an entrance surface, an exit surface connected to the incident surface, and a bottom surface opposite to the exit surface ;——The above-mentioned cold cathode fluorescent lamp located on the light incident side of the light plate. The advantage of the present invention is that the cathode fluorescent lamp emits light uniformly, thereby; the shadow area of the Xiaom module enables the light utilization rate to be improved, and since the cold cathode (four) light and the light guide plate have the same length, The assembly area of the entire backlight module is reduced, and the cost is reduced. [Embodiment] ^ Please refer to the third drawing, which is a cross-sectional view of the cold cathode fluorescent lamp 21 of the present invention. The cold cathode fluorescent lamp 21 is a closed glass tube 215, and the inner wall of the glass tube is coated with a phosphor (Fig. The glass tube 215 is filled with mercury vapor (not shown), wherein the outer surfaces of the two ends of the glass tube 215 are respectively engraved with a plurality of v-shaped grooves 214. The V-shaped grooves 214 are uniformly distributed in structure, which is produced by precision machining or by lithography. The pitch L of the V-shaped groove 214 is 10 to 20 / zm (micrometer)' and its apex angle is 75. ~115. . Wherein, each pitch of the v-shaped grooves 214 is equidistantly distributed. During operation, the light is emitted from the inner wall 211 of the cold cathode fluorescent lamp glass tube, and the structure of the v-shaped groove 214 forms an angle with the light exit surface 212, thereby reducing the incident angle of the light 0 and the light exit surface 212, when the light reaches ^V When the groove 214 is refracted, it is emitted from the light-emitting surface 212 of the cold cathode fluorescent lamp, which reduces the total reflection of the light on the light-emitting surface 212, thereby improving the light-emitting brightness at both ends of the cold cathode fluorescent lamp 21. Referring to the fourth figure, a backlight module of the present invention includes the cold cathode fluorescent lamp 21 and a light guide plate 22 of the present invention. The cold cathode fluorescent lamp 21 is for emitting a light beam. The light guide plate 22 guides the cold cathode fluorescent lamp 1309740 21 to emit a light beam, and converts it into a surface light source. The light guide plate 22 is formed in a flat plate shape and is made of a transparent material such as acryl, glass or polycarbonate, and includes an incident surface 221, an exit surface (not shown) connected to the incident surface 221, and an opposite surface to the exit surface. Bottom 223. The incident surface 221 is for receiving light from the cold cathode fluorescent lamp 21. The bottom surface 223 of the light guide plate 22 is provided with a plurality of dots 224 to improve the brightness and uniformity of the light emitted from the light guide plate 22. The size of the dots 224 is increased in a direction away from the incident surface 221, which is a spherical shape. The dots 224 can also be cylindrical, cube-shaped, pyramidal or other suitable shapes. The dots 224 may be distributed on the bottom surface 223 of the light guide plate 22 by printing or injection molding. Alternatively, a plurality of V-shaped grooves may be provided in the bottom surface 223 to replace the plurality of dots 224. The backlight module of the present invention may have other modified designs, for example, an anti-reflection film or an anti-reflection film may be forged on the incident surface by electron beam evaporation or chemical vapor deposition to achieve coloration of the incident light. The entrance surface may be coated with a fluorescent layer, and the bottom surface may be provided with a fog-like deciduous flower or a bite flower instead of the plurality of dots. The shape of the light guide plate is not limited to a flat plate shape, and may also be a wedge shape. Since the ineffective light-emitting section of the cold cathode fluorescent lamp of the invention is engraved with a V-shaped groove, the light is emitted, the total light reflection is reduced, the light-emitting brightness of the cold cathode fluorescent lamp is improved, and the cold cathode fluorescent lamp of the invention is The length of the effective light-emitting area and the light guide plate are not required to be lengthened, thereby reducing the volume of the backlight module and reducing the production cost. In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiments, and those skilled in the art will be able to make equivalent modifications or changes according to the spirit of the present invention. All should be covered by the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS The first figure is a cross-sectional view of a prior art cold cathode fluorescent lamp. The second figure is a perspective view of a prior art backlight module. The third figure is a cross-sectional view of the cold cathode fluorescent lamp of the present invention. The fourth figure is a plan view of the backlight module of the present invention. [Main component symbol description] Light guide plate 22 Cold cathode fluorescent lamp 21 Incident surface 221 V-shaped groove 214 Backlight module 2 Bottom surface 223 Dot 224 Glass tube inner wall 211 Light-emitting surface 212 Closed glass tube 215 10