P53970054TW 29485twf.doc/d 六、發明說明： 【發明所屬之技術領域】 本發明是有關於-種發光裝置，且特別是有關於一種 使用多個發光條以形成光場的薄型燈箱。 【先前技術】 近年來，由於發光二極體的發光效率不斷提升，使得 發光二極體在許多領域已漸漸取代日光燈與白幟燈泡，例 如舄要咼速反應的掃描器燈源、液晶顯示器的背光源戋前 光源汽車的儀表板照明、交通號誌燈、—般的照明設備， 以及4又衫機的光源荨。由於發光二極體的發光現象不是藉 由加熱發光或放電發光，而是屬於冷性發光，因此發光二 極體的壽命長達十萬小時以上。此外，發光二極體更具有 反應速度快（約為HT9秒）、體積小、低用電量、低污染、 高可靠度、適合量產等優點，所以發光二極體所能應用的 領域十分廣泛。然而，由於發光二極體為點光源、且具有 很強的指向性，使其應用受到限制。 目前已經有人將發光二極體應用於顯示器的背光模 組中。也就是以發光二極體作為背光模組的光源。然而， 由於發光二極體點光源具有很強的指向性，要使發光二極 體所發出的光能夠均勻混光以構成一個均勻的面光源，設 置在這些發光二極體上方的擴散板往往需與這些發光二極 體維持足夠的距離。如：美國發明專利US6,654,088「Liquid crystal display device」說明了一種燈箱，在燈管間設置凸 P53970054TW 29485twf.doc/d 錐狀之單-反射結構’藉由改變錐狀頂角、高度及燈管間 距來增加絲_中與㈣化。但是，其燈箱間距須維持 在約Umm，才可達到良好的均句化效果，導致燈箱無法 進步/#化。因此’背光模組整體的厚度無法再減少，因 而影響顯示器薄化的發展。 【發明内容】 一本發明提供一種薄型燈箱，其可以克服傳統利用發光 一極體作為光源時會有厚度無法進一步薄化的問題。 本發明提出一種薄型燈箱，其包括一框架、多個發光 條以及一蓋板。框架具有一底部、多個側壁以及由底部與 側壁所構成的一谷納空間。發光條設置於框架的容納空間 内八中母發光條包括一導光條以及至少一光源。導光 條具有至少一光出射面與至少一光入射面，且導光條除了 光入射面以外的至少一表面上具有多個微結構。光源配置 於導光條的光入射面旁，其中光源所產生的光進入導光條 之後，微結構會破壞其全反射而使光線從光出射面射出。 盍板架設於框架上且覆蓋在發光條的上方，其中蓋板與框: 架的底部之間的距離小於1〇公釐。 在本發明之一實施例中，上述之蓋板上具有擴散圖 案。 在本發明之一實施例中，上述具有擴散圖案之蓋板的 霧度為介於70%〜90%。 在本發明之一實施例中，上述之薄型燈箱更包括一擴 1360619 P53970054TW 29485twf.d〇c/d 散膜，貼附於蓋板的表面上。 在本發明之一實施例中，上述擴散膜與蓋板的整體霧 度為介於70%〜90%。 在本發明之一實施例中，上述之框架的底部具有反射 性質。 在本發明之一實施例中，上述之薄型燈箱中的導光條 更包括一反射層，位於導光條除了光出射面以及光入射面 以外的表面。 • · - . · · .- 在本發明之一實施例中，上述之相鄰的微結構之間具 有間距，且所述間距隨著遠離光入射面的方向而遞減。 在本發明之一實施例中，上述之微結構的尺寸隨著遠 離光入射面的方向而增大。 本發明另提出一種薄型燈箱，其包括一框架、多組發 光條以及一盍板。框架具有一底部、多個側壁以及由底部 與側壁所構成的谷納空間。多組發光條設置於框架的容 納空間内，其中每一組發光條包括一第一發光條以及一第 二發光條，第一與第二發光條緊鄰設置，且相鄰的兩組發 光條之間相距一固定距離，其中第__與第二發光條分別包 括一導光條以及至少一光源。導光條具有至少一光出射面 與至少一光入射面，導光條除了光入射面以外的至少一表 面上具有多個微結構。光源配置於導光條的光入射面旁， 其中光源所產生的光進入導光條之後，微結構會破壞其全 反射而使光線從光出射面射出。蓋板架設於框架上且覆蓋 在發光條的上方’其中蓋板與框架的底部之間的距離小於 1360619 P53970054TW 29485twf.doc/d 10公釐。 在本發明之-實施例中，上述之第—發光條與第二發 光仏的一端相接觸且其另一端相分離，且第—發光條與二 發光條之間具有一夾角，其介於4〇〜no度。 ' 在本發明之-實施例中，上述之第一ς光條與第二發 光條並排平躺在框架的底部》 在本發明之-實施例中，上述之第一發光條與第二發 光條彼此背對背直立排列於框架的底部。 在本發明之一實施例中，上述之蓋板上具有擴散圖 案。 ' 在本發明之一實施例中，上述具有擴散圖案之蓋板的 霧度為介於70%〜90%。 在本發明之一實施例中’上述之薄型燈箱，更包括一 擴政膜，貼附於羞板的表面上。 在本發明之一實施例中，上述擴散膜與蓋板的整體霧 度為介於70%〜90%。 在本發明之一實施例中’上述之框架的底部具有反射 性質。 在本發明之一實施例中，上述之薄型燈箱中的導光條 更包括一反射層，位於導光條除了光出射面以及光入射面 以外的表面。 在本發明之一實施例中，上述之相鄰的微結構之間具 有間距，且所述間距隨著遠離光入射面的方向而遞減。 在本發明之一實施例中，上述之微結構的尺寸隨著遠 1360619 P53970054TW 29485twf.doc/d 離光入射面的方向而增大。 ㈣本發明之薄型燈箱内所採用的發光條上具有特 殊的言又計’其可喊光_發出的紐在射料光條之後 產生特定的光場分佈。0此，上述發光條所產生的光線可 在很短距離即能產生均勻的混光效果，因而 整體厚度。 ΘP53970054TW 29485twf.doc/d VI. Description of the Invention: [Technical Field] The present invention relates to a light-emitting device, and more particularly to a thin light box using a plurality of light-emitting strips to form a light field. [Prior Art] In recent years, due to the increasing luminous efficiency of light-emitting diodes, light-emitting diodes have gradually replaced fluorescent lamps and white light bulbs in many fields, such as scanner light sources for idling reactions, liquid crystal displays. The backlight of the front light source car dashboard lighting, traffic lights, general lighting equipment, and the light source of the 4 and the machine. Since the luminescence phenomenon of the illuminating diode is not by heating luminescence or discharge luminescence but by cold luminescence, the life of the illuminating diode is as long as 100,000 hours or more. In addition, the light-emitting diode has the advantages of fast response speed (about HT9 seconds), small volume, low power consumption, low pollution, high reliability, and suitable for mass production, so the field of application of the light-emitting diode is very widely. However, since the light-emitting diode is a point light source and has strong directivity, its application is limited. Light-emitting diodes have been used in backlight modules for displays. That is to say, the light-emitting diode is used as the light source of the backlight module. However, since the light-emitting diode point light source has strong directivity, the light emitted by the light-emitting diode can be uniformly mixed to form a uniform surface light source, and the diffusion plate disposed above the light-emitting diodes is often A sufficient distance from these light-emitting diodes is required. For example, US Patent No. 6,654,088 "Liquid crystal display device" describes a light box with a convex P53970054TW 29485twf.doc/d tapered single-reflective structure between the tubes. By changing the cone angle, height and lamp The tube spacing is used to increase the filament _ medium and (four). However, the spacing of the light boxes must be maintained at about Umm to achieve a good uniformization effect, resulting in a failure of the light box to progress. Therefore, the thickness of the entire backlight module can no longer be reduced, thus affecting the development of thinning of the display. SUMMARY OF THE INVENTION One invention provides a thin type light box which overcomes the problem that the thickness cannot be further thinned when the light-emitting one body is used as a light source. The present invention provides a thin light box that includes a frame, a plurality of light strips, and a cover. The frame has a bottom, a plurality of side walls, and a valley space formed by the bottom and the side walls. The light-emitting strip is disposed in the receiving space of the frame. The eight-in-home light-emitting strip comprises a light guiding strip and at least one light source. The light guiding strip has at least one light emitting surface and at least one light incident surface, and the light guiding strip has a plurality of microstructures on at least one surface other than the light incident surface. The light source is disposed beside the light incident surface of the light guide strip, and after the light generated by the light source enters the light guide strip, the microstructure destroys the total reflection and causes the light to exit from the light exit surface. The seesaw is erected on the frame and covers the upper of the light strip, wherein the distance between the cover and the frame: the bottom of the frame is less than 1 mm. In an embodiment of the invention, the cover plate has a diffusion pattern thereon. In an embodiment of the invention, the cover having the diffusion pattern has a haze of from 70% to 90%. In an embodiment of the invention, the thin light box further comprises a diffuser 1360619 P53970054TW 29485twf.d〇c/d attached to the surface of the cover. In an embodiment of the invention, the diffusing film and the cover have an overall haze of from 70% to 90%. In an embodiment of the invention, the bottom of the frame has a reflective property. In an embodiment of the invention, the light guiding strip in the thin light box further includes a reflective layer on a surface of the light guiding strip except the light exiting surface and the light incident surface. • In one embodiment of the invention, the adjacent microstructures have a spacing therebetween and the spacing decreases as the direction away from the light entrance surface. In one embodiment of the invention, the dimensions of the microstructures described above increase with distance from the plane of incidence of the light. The invention further provides a thin light box comprising a frame, a plurality of sets of light strips and a seesaw. The frame has a bottom, a plurality of side walls, and a valley space formed by the bottom and the side walls. The plurality of sets of light-emitting strips are disposed in the receiving space of the frame, wherein each set of the light-emitting strips comprises a first light-emitting strip and a second light-emitting strip, the first and second light-emitting strips are disposed adjacent to each other, and the two adjacent light-emitting strips are disposed The distance between the first __ and the second illuminating strip includes a light guiding strip and at least one light source. The light guiding strip has at least one light emitting surface and at least one light incident surface, and the light guiding strip has a plurality of microstructures on at least one surface other than the light incident surface. The light source is disposed beside the light incident surface of the light guiding strip. After the light generated by the light source enters the light guiding strip, the microstructure destroys the total reflection and causes the light to be emitted from the light emitting surface. The cover is erected on the frame and covers the upper side of the light strip. The distance between the cover and the bottom of the frame is less than 1360619 P53970054TW 29485twf.doc/d 10 mm. In an embodiment of the invention, the first light-emitting strip is in contact with one end of the second light-emitting raft and the other end thereof is separated, and the first light-emitting strip and the second light-emitting strip have an angle between 〇~no degrees. In the embodiment of the present invention, the first light bar and the second light bar are lying side by side at the bottom of the frame. In the embodiment of the present invention, the first light bar and the second light bar are They are arranged upright back to each other at the bottom of the frame. In an embodiment of the invention, the cover plate has a diffusion pattern thereon. In an embodiment of the invention, the cover having the diffusion pattern has a haze of from 70% to 90%. In an embodiment of the invention, the thin light box described above further includes a stretch film attached to the surface of the board. In an embodiment of the invention, the diffusing film and the cover have an overall haze of from 70% to 90%. In one embodiment of the invention, the bottom of the frame described above has reflective properties. In an embodiment of the invention, the light guiding strip in the thin light box further includes a reflective layer on a surface of the light guiding strip except the light exiting surface and the light incident surface. In one embodiment of the invention, the adjacent microstructures have a spacing therebetween and the spacing decreases as the direction away from the light entrance surface. In one embodiment of the invention, the dimensions of the microstructures described above increase with distance from the light incident surface of 1360619 P53970054TW 29485twf.doc/d. (d) The illuminating strip used in the thin type light box of the present invention has a special slogan that its squeaking light emits a specific light field distribution after the illuminating strip. 0, the light generated by the above-mentioned illuminating strip can produce a uniform light mixing effect at a short distance, and thus the overall thickness. Θ
為讓本發明之上述特徵和優點能更明顯易懂，下文 舉實施例，並配合所附圖式作詳細說明如下。 寻 【實施方式】 圖1A是根據本發明一實施例之薄型燈箱的剖面示惫 圖。請參照圖1A，本實施例之薄膜燈箱包括框架1〇、笋 光條12以及蓋板14。在一較佳實施例中，在蓋板μ上更 包括設置有光學膜組16。 框架10具有一底部l〇a、多個側壁i〇b以及由底部 10a與側壁l〇b所構成的一容納空間s。在本實施例令，枢 架10的底部10a具有反射性質。在其他的實施例中，樞架 10的底部10a及側壁10b都具有反射性質。 蓋板14架設於框架10上且覆蓋在發光條12的上方。 特別是，蓋板14與框架10的底部10a之間的距離D小於 1〇公釐。在一實施例中，蓋板14具有擴散性質，也就是 說，蓋板14本身為具有擴散圖案的設計。在一實施例中， 具有擴散圖案之蓋板14的霧度為介於70%〜90%。在另〜 實施例中，蓋板14可為單純的透明蓋板，而且在蓋板14 1360619 P53970054TW 29485twf.doc/d 表面更包括覆盍有一擴散膜，換言之，在蓋板14上方的光 學膜組16之中有一層膜層為擴散膜。在一實施例中，此擴 散膜與蓋板的整體霧度為介於70%〜90%。一般而言，目前 現有的直下式燈箱擴散板霧度約大於90%。然而，本實施 例所使用之具有擴散圖案之蓋板或者是蓋板與擴散膜之整 體格度低於90% (約為70%〜90%)，因此本實施例之具 有擴散圖案之蓋板或者是蓋板與擴散膜之整體霧度較目前 現有的直下式燈箱擴散板霧度低》 另外，本發明不特別限制光學膜組16中的光學膜片 的數目，其可以是一片、兩片或是兩片以上，且其除了可 以是擴散膜之外，還可以是增亮膜等等。在本實施例之圖 式是以兩片光學膜片為例來說明，但其並非用以限定本發 明。 另外，發光條12設置於框架1〇的容納空間s内。在 圖1A之實施例中，發光條12是各自排列於框架1〇的底 部。然而，本發明不限於此，在其他的實施例中，發光條 12還可是其他種的排列方式，詳細說明如下。 圖1B是根據本發明另一實施例之薄型燈箱的剖面示 意圖。圖1B之薄型燈箱與圖ία之薄型燈箱之結構相似， 不同之處在於圖1B之薄型燈箱内的發光條可分成多組發 光條，母一組發光條12包括一第一發光條12a以及一第二 發光條12b。第一發光條12a與第二發光條nb緊鄰設置。 相鄰的兩組發光條12之間則是相距一固定距離。特別是， 在圖1B的實施例中，第一發光條12a與第二發光條i2b P53970054TW 29485twf.d〇c/d 的一端相接觸且其另一端相分離，且第一發光條12&與二 發光條12b之間具有一夾角，其介於4〇〜13〇度。換言之， 第一發光條12a與第二發光條12b是以，，八，，字形的方式排 列在一起，且兩者之間的夾角是介於4〇〜13〇度。 圖1C是根據本發明另一實施例之薄型燈箱的剖面示 意圖。圖1C之薄型燈箱與圖1B之薄型燈箱之結構相似， 不同之處在於圖1B之薄型燈箱内的第一發光條12a與第 二發光條12b彼此背對背直立排列於框架1〇的底部1〇&。 圖1D是根據本發明另一實施例之薄型燈箱的剖面示 意圖。圖1D之薄型燈箱與圖1B之薄型燈箱之結構相似， 不同之處在於圖1D之薄型燈箱内的第一發光條12a與第 二發光條12b是並排平躺在框杂1〇的底部1〇a。 接下來將詳細說明上述圖1A至圖1D之薄型燈箱内 的發光條的詳細結構。請參照圖2，每一個發光條12(或發 光條12a、12b)包括一導光條120以及至少一光源n〇。導 光條120具有至少一光出射面122與至少一光入射面 124’且導光條120除了光入射面124以外的至少一表面上 具有多個微結構126。光源110配置於導光條126的光入 射面124旁’其中光源11〇所產生的光線H〇a進入導光條 120之後’微結構126會破壞其全反射而使光線從光出射 面122射出。 更詳細的說明是，由於導光條120在除了光入射面124 以外的至少一表面具有多個微結構126，因此當光源11〇 所產生的光線ll〇a由光入射面124進入導光條120後，大 1360619 P53970054TW 29485twf.doc/d 部分的光線將以全反射的方式在導光條12〇内傳遞，且刊 光線遇到具有微結構126的表面，而具有微結構126的表 面將會破壞全反射而使光線ll〇b由光出射面122射出。換 言之，在本實施例中，由於微結構126的存在，光線不會 只在導光體120的前後兩端發光，而是主要會由配置有微 結構126的對應表面（即光出射面122)射出。 在本只施例中，微結構126是突出於導光條12〇的結 構型態，其例如是半圓柱體、半橢圓柱體、多角柱體、球 狀體或是角椎體。但本發明不限於此，在其他實施例中， 微結構也可以是凹入導光條的結構型態，如圖3所示。在 圖3所緣示的微結構126是溝槽型態的微結構，其可以是 半圓柱溝槽、半_㈣槽、球狀結構溝I衫角柱溝槽。 在一實施例中，每一微結構126與導光條120之間的截面 面積小於W，較佳的是介於4 mm2〜5〇〇nm2 ， =構m的高度小於上述截面面積的開根號。值得一提 ^ 1由調整微結構126的高度還可以控制光線的發散 开二 =光條120的截面可以是多邊形、圓形、橢圓 :或疋不規則形。例如，在圖2及圖3的實施例中 外型為方柱形。當然，㈣条120的外型亦可以 2圖4A至4E所示之三角柱、扭曲枝、圓柱、多邊形柱 或平板。另外，導光條12〇具有可撓性曾 ，或是不可恢復性導光體。若導光：;2== 性的，那麼其在經扭曲或形變之後，就會固定復 1360619 P53970054TW 29485twf.doc/d 除非再有外力使其產生形變。若導光條120是可恢復性 的’表示其在經扭曲或形變之後，將需透過其他的固定裝 置將此形狀固定’否則將會自行恢復成原來的形狀。無論 是採用可恢復或不可恢復的導光體，其都是可任意扭曲或 是形變的。在一實施例中，導光條120的可彎曲程度為可 撓曲弧度曲率半徑小於30 cm。此外，導光條12〇的材質 為透光性材料’其例如是紫外光固化樹脂或是矽膠。 另外，請參照圖2與圖3，為了使光源11〇所產生的 光線能夠從導光條120之光出射面122均勻射出，相鄰的 微結構126之間具有一間距d，且間距d是隨著遠離光入 射面124的方向而遞減。在另一實施例中，為了使光源ι1〇 所產生的光線能夠從導光條120之光出射面122均勻射 出’微結構126的尺寸是隨著遠離光入射面124的方向而 增大。在一實施例中，微結構126之間的間距d是小於 5mm ’較佳的是介於5mm〜ΙΟ/zm。值得注意的是，藉由 調整微結構126之間的間距(也就是微結構的密度），還可 以調整光射出的強度。 值得一提的是，光源110可以是單一個發光二極體(如 圖2與圖3所示）或發光二極體陣列，其是以嵌入或是貼附 的方式’配置於導光條12〇的光入射面124旁。當然，所 屬技術領域中具有通常知識者可視實際需要，而選擇適當 的光源11 〇。 另外’根據本發明之其他實施例，發光條12可進一 步包括一反射層15。在圖1A至圖1D之實施例中，反射 12 1360619 P53970054TW 294S5twf.doc/d 層15是覆蓋於導光條120之底部表面。然本發明不限於 此’在其他的實施例中’反射層15可以覆蓋除了光出射面 122以及光入射面124以外的表面。換言之，上述之發光 條12可以是單面出光或是多面出光’因此可視實際的產品 設計而於導光條120的一表面、兩表面或三表面設置反射 層’或者是完全不設置反射層’使其他的表面作為光出射 面。值得一提的是’上述之反射層可直接以貼附的方式覆 蓋在導光條120除了光出射面122以及光入射面124以外 的表面’也可以使用反射鑛_ 處理，直接鍛在導光條12 〇 除了光出射面122以及光入射面124以外的表面。 上述各實施例所描述的導光條120的光出射面122是 平面’然在本發明中’導光條120的光出射面122還可以 是曲面或是波浪面，以下將舉幾個實例來說明。如圖5所 示，導光條120為彎曲條狀形狀，其是γ方向的扭曲’因 而光射出面122為彎曲面。在圖6中，導光條丨2〇是另一 種彎曲條狀形狀’其是z方向的扭曲，因而光射出面122 為平面。在圖7中，導光條120為圓柱扭曲條狀形狀，且 微結構126沿著柱狀表面設置’因此光將從為配置有微結 構126的區域射出，因而整個柱狀表面都會發光。在囷8 中，導光條！20的光射出© 122 ^皮浪面，“線自“ 狀的光射出面122射出時，會呈現出多層次的發光效果。 在圖9及圖1G t，分別示意光出射面可以為内^曲面或外 凸曲面。 以下將例舉三個實例來說明薄型燈箱之光場分佈以 I S3 13 1360619 P53970054TW 29485twf.doc/dThe above described features and advantages of the present invention will be more apparent from the following description. [Embodiment] Fig. 1A is a cross-sectional view showing a thin type light box according to an embodiment of the present invention. Referring to Figure 1A, the film light box of the present embodiment includes a frame 1 , a bamboo strip 12 and a cover 14. In a preferred embodiment, the cover film μ further includes an optical film set 16 disposed thereon. The frame 10 has a bottom portion 10a, a plurality of side walls i〇b, and a receiving space s formed by the bottom portion 10a and the side wall 10b. In the present embodiment, the bottom portion 10a of the pivot frame 10 has reflective properties. In other embodiments, both the bottom 10a and the side walls 10b of the pivot 10 have reflective properties. The cover plate 14 is mounted on the frame 10 and covers the upper side of the light-emitting strip 12. In particular, the distance D between the cover 14 and the bottom 10a of the frame 10 is less than 1 mm. In one embodiment, the cover plate 14 has a diffusing nature, that is, the cover plate 14 itself is of a design having a diffusing pattern. In one embodiment, the cover 14 having the diffusion pattern has a haze of between 70% and 90%. In another embodiment, the cover 14 can be a simple transparent cover, and the cover 14 1460619 P53970054TW 29485twf.doc/d surface further includes a diffusion film, in other words, an optical film set above the cover 14. One of the layers 16 is a diffusion film. In one embodiment, the overall haze of the diffuser film and the cover sheet is between 70% and 90%. In general, the current direct-type light box diffuser has a haze of more than 90%. However, the cover plate having the diffusion pattern used in this embodiment or the cover plate and the diffusion film have an overall degree of less than 90% (about 70% to 90%), so the cover plate having the diffusion pattern of this embodiment Alternatively, the overall haze of the cover plate and the diffusion film is lower than that of the conventional direct-type light box diffusion plate. In addition, the present invention does not particularly limit the number of optical films in the optical film group 16, which may be one piece or two pieces. Or two or more, and in addition to being a diffusion film, it may be a brightness enhancement film or the like. The embodiment of the present invention is illustrated by taking two optical films as an example, but it is not intended to limit the present invention. Further, the light-emitting strip 12 is disposed in the accommodation space s of the frame 1A. In the embodiment of Fig. 1A, the light-emitting strips 12 are each arranged at the bottom of the frame 1A. However, the present invention is not limited thereto, and in other embodiments, the light-emitting strips 12 may be arranged in other kinds as described in detail below. Fig. 1B is a schematic cross-sectional view of a thin type light box in accordance with another embodiment of the present invention. The thin type light box of FIG. 1B is similar in structure to the thin type light box of FIG. 1A, except that the light strip in the thin type light box of FIG. 1B can be divided into a plurality of sets of light strips, and the set of light strips 12 includes a first strip 12a and a The second light bar 12b. The first light bar 12a and the second light bar nb are disposed in close proximity. The adjacent two sets of light-emitting strips 12 are separated by a fixed distance. In particular, in the embodiment of FIG. 1B, the first light strip 12a is in contact with one end of the second light strip i2b P53970054TW 29485twf.d〇c/d and the other end thereof is separated, and the first light strip 12 & The light strips 12b have an angle between 4 and 13 degrees. In other words, the first illuminating strip 12a and the second illuminating strip 12b are arranged in a manner of, eight, and zigzag, and the angle between the two is between 4 〇 and 13 〇. Fig. 1C is a cross-sectional view of a thin type light box in accordance with another embodiment of the present invention. The thin type light box of FIG. 1C is similar in structure to the thin type light box of FIG. 1B, except that the first light strip 12a and the second light strip 12b in the thin type light box of FIG. 1B are arranged back to back from each other upright at the bottom of the frame 1〇&; Fig. 1D is a cross-sectional view of a thin type light box in accordance with another embodiment of the present invention. The thin type light box of Fig. 1D is similar in structure to the thin type light box of Fig. 1B, except that the first light strip 12a and the second light strip 12b in the thin type light box of Fig. 1D are placed side by side at the bottom of the frame. a. Next, the detailed structure of the light-emitting strip in the thin type light box of the above-mentioned Figs. 1A to 1D will be described in detail. Referring to Figure 2, each of the light strips 12 (or the light strips 12a, 12b) includes a light guide strip 120 and at least one light source n. The light guiding strip 120 has at least one light emitting surface 122 and at least one light incident surface 124' and the light guiding strip 120 has a plurality of microstructures 126 on at least one surface except the light incident surface 124. The light source 110 is disposed beside the light incident surface 124 of the light guiding strip 126. After the light H〇a generated by the light source 11〇 enters the light guiding strip 120, the microstructure 126 will destroy its total reflection and emit light from the light exit surface 122. . In more detail, since the light guiding strip 120 has a plurality of microstructures 126 on at least one surface other than the light incident surface 124, the light ll 〇 a generated by the light source 11 由 enters the light guiding strip from the light incident surface 124. After 120, the light of the portion 1360619 P53970054TW 29485twf.doc/d will be transmitted in the light guide strip 12〇 in a total reflection manner, and the ray will encounter the surface having the microstructure 126, and the surface having the microstructure 126 will The total reflection is destroyed and the light ray 〇b is emitted from the light exit surface 122. In other words, in the present embodiment, due to the presence of the microstructure 126, the light does not emit light only at the front and rear ends of the light guide body 120, but mainly by the corresponding surface (ie, the light exit surface 122) where the microstructure 126 is disposed. Shoot out. In the present embodiment, the microstructure 126 is a structural pattern that protrudes from the light guiding strip 12A, and is, for example, a semi-cylindrical, semi-elliptical cylinder, polygonal cylinder, spheroid or horn. However, the present invention is not limited thereto. In other embodiments, the microstructure may also be a structural type of a concave light guiding strip, as shown in FIG. The microstructure 126 shown in Figure 3 is a trench-type microstructure which may be a semi-cylindrical trench, a semi- (four) trench, or a spherical trench I. In one embodiment, the cross-sectional area between each microstructure 126 and the light guiding strip 120 is less than W, preferably between 4 mm 2 and 5 〇〇 nm 2 , and the height of the structure m is smaller than the opening of the cross-sectional area. number. It is worth mentioning that ^1 can also control the divergence of light by adjusting the height of the microstructure 126. The cross section of the light strip 120 can be a polygon, a circle, an ellipse: or an irregular shape. For example, in the embodiment of Figs. 2 and 3, the outer shape is a square cylinder shape. Of course, the shape of the (four) strip 120 can also be a triangular prism, a twisted branch, a cylinder, a polygonal column or a flat plate as shown in Figs. 4A to 4E. In addition, the light guiding strip 12 has a flexible or a non-recoverable light guiding body. If the light guide: 2== sex, then after twisting or deformation, it will be fixed 1360619 P53970054TW 29485twf.doc/d unless there is any external force to make it deform. If the light guiding strip 120 is recoverable, it means that after being twisted or deformed, it will need to be fixed by other fixing means. Otherwise, it will return to its original shape by itself. Whether it is a recoverable or non-recoverable light guide, it can be arbitrarily twisted or deformed. In one embodiment, the light guide strip 120 is bendable to a degree of curvature of less than 30 cm. Further, the material of the light guiding strip 12A is a light transmissive material, which is, for example, an ultraviolet curable resin or a silicone rubber. In addition, referring to FIG. 2 and FIG. 3, in order to enable the light generated by the light source 11 to be uniformly emitted from the light exit surface 122 of the light guiding strip 120, the adjacent microstructures 126 have a spacing d between them, and the spacing d is Decreasing with the direction away from the light incident surface 124. In another embodiment, the light generated by the source ι1 能够 can be uniformly emitted from the light exit surface 122 of the light guiding strip 120. The size of the microstructure 126 increases with the direction away from the light incident surface 124. In one embodiment, the spacing d between the microstructures 126 is less than 5 mm', preferably between 5 mm and ΙΟ/zm. It is worth noting that by adjusting the spacing between the microstructures 126 (i.e., the density of the microstructures), the intensity of the light exit can also be adjusted. It is worth mentioning that the light source 110 can be a single light-emitting diode (as shown in FIG. 2 and FIG. 3 ) or a light-emitting diode array, which is disposed on the light guide strip 12 in an embedded or attached manner. Next to the light incident surface 124 of the crucible. Of course, those having ordinary knowledge in the technical field can select an appropriate light source 11 可视 according to actual needs. Further, in accordance with other embodiments of the present invention, the light strip 12 can further include a reflective layer 15. In the embodiment of Figures 1A through 1D, the reflective layer 12 1360619 P53970054TW 294S5twf.doc/d layer 15 is overlying the bottom surface of the light guiding strip 120. However, the present invention is not limited to this. In other embodiments, the reflective layer 15 may cover surfaces other than the light exit surface 122 and the light incident surface 124. In other words, the above-mentioned light-emitting strips 12 can be single-sided light-emitting or multi-faceted light. Therefore, a reflective layer can be disposed on one surface, two surfaces or three surfaces of the light guiding strip 120, or a reflective layer can be disposed at all, depending on the actual product design. Make other surfaces as the light exit surface. It is worth mentioning that the above-mentioned reflective layer can directly cover the surface of the light guiding strip 120 except the light exit surface 122 and the light incident surface 124 in a manner of attachment. The strip 12 has a surface other than the light exit surface 122 and the light incident surface 124. The light exit surface 122 of the light guide strip 120 described in the above embodiments is a plane. However, in the present invention, the light exit surface 122 of the light guide strip 120 may also be a curved surface or a wave surface. Several examples will be given below. Description. As shown in Fig. 5, the light guiding strip 120 has a curved strip shape which is a twist in the γ direction, and thus the light emitting surface 122 is a curved surface. In Fig. 6, the light guiding strip 丨2〇 is another curved strip shape 'which is a twist in the z direction, and thus the light exiting surface 122 is a flat surface. In Fig. 7, the light guiding strip 120 has a cylindrically twisted strip shape, and the microstructure 126 is disposed along the cylindrical surface so that light will be emitted from the area where the microstructure 126 is disposed, and thus the entire columnar surface will emit light. In 囷8, the light guide! The light of 20 is emitted from the source of 122. The surface of the light is emitted from the light-emitting surface 122, which gives a multi-layered luminous effect. In Fig. 9 and Fig. 1G t, respectively, the light exit surface can be an inner curved surface or a convex curved surface. Three examples will be exemplified below to illustrate the light field distribution of a thin light box. I S3 13 1360619 P53970054TW 29485twf.doc/d
及強度分佈’且此三個實施例皆以每一發光條的長度為 150mm且厚度為2mm ’並在對應於光出射面的表面上具 有V型微結構，同時在該表面上設置一反射層。每一發光 條的導光條兩端分別設置一光源。導光條上之相鄰的V型 微結構之間的間距由導光條兩端往導光條的中央逐漸線性 遞減（由0.25mm逐漸遞減成0.17mm)，且V型微結構深度And the intensity distribution' and the three embodiments each have a length of 150 mm and a thickness of 2 mm' and each has a V-shaped microstructure on the surface corresponding to the light exit surface, and a reflective layer is disposed on the surface. . A light source is disposed at each end of each of the light guiding strips of each of the light strips. The spacing between adjacent V-shaped microstructures on the light guiding strip is gradually decreasing linearly from the ends of the light guiding strip to the center of the light guiding strip (gradually decreasing from 0.25 mm to 0.17 mm), and the V-shaped microstructure depth
是由導光條兩端往導光條的中央逐漸線性遞增（由3um逐 漸遞增成5um)。 實例1 貝例1為如圖1B之具有排列成，，八，，字形的發光條之 薄型燈箱。在本實例中的每一組發光條的夾角為6〇度，且 每二發光條之V型微結構頂角為9〇〜120度之間。此薄型 燈箱之光場分佈如圖11A所示，其#錄B為光場在χ ^向的剖面，且曲線R為光場在γ方向的剖面。另外，此 薄型燈相之光場強度分佈如圖UB所示，其中圖UB中的It is gradually linearly increased from the two ends of the light guiding strip to the center of the light guiding strip (increasing from 5um to 5um). Example 1 Shell Example 1 is a thin light box having light-emitting strips arranged in an octagonal shape, as shown in Fig. 1B. The angle of each set of light strips in this example is 6 degrees, and the V-shaped microstructure apex angle of each of the two light strips is between 9 〇 and 120 degrees. The light field distribution of the thin light box is as shown in Fig. 11A, where #录B is the cross section of the light field in the χ direction, and the curve R is the cross section of the light field in the γ direction. In addition, the light field intensity distribution of this thin lamp phase is shown in Figure UB, where Figure UB
X轴表示薄型燈㈣位置，γ軸表示光場強度。 實例2 實例2為如圖1C之發光條彼此背對背直立排列之薄 本實例中ί每—發光條之V型微結構頂角為 〜 又之間。此薄型燈箱之光場分佈如圖12A所示，The X axis represents the position of the thin lamp (four) and the γ axis represents the intensity of the light field. Example 2 Example 2 is that the light-emitting strips of Fig. 1C are arranged side by side in an upright manner. In this example, the V-shaped microstructure apex angle of each of the light-emitting strips is between ~. The light field distribution of the thin light box is as shown in Fig. 12A.
/、曲線B為光場在χ方向的剖面且曲線r為光場在Y/, curve B is the cross section of the light field in the x direction and the curve r is the light field in the Y
方向的剖面。另外，此薄型燈箱之錢強度分佈如圖12B 所不，其中® 12B巾的X轴表示薄型燈箱的位置，Y軸表 示光場強度。 軸衣 153 14 1360619 P53970054TW 29485twf.doc/d 實例3 貝例3為如圖id之發光條並排平躺之薄型燈箱。在 本實例中的每一組發光條之v型微結構頂角為大於14〇 度。此薄型燈箱之光場分佈如圖13Α所示’其中曲線β為 光場在X方向的剖面，且曲線尺為光場在¥方向的剖面。 另外，此薄型燈箱之光場強度分佈如圖13Β所示其中圖 13Β中的X轴表示薄型燈箱的位置，γ軸表示光場強度。 综上所述，本發明之燈箱結構内的發光條是由導光絛 以及光源所構成，透過導光條以及導光條上的微結構的設 計可以使光源的光線在射出導光條之後具有特殊的光場分 佈，因而各發光條所發出的光線可以在很短的距離内即達 到良好的混光效果。因此，燈箱的蓋板及光學膜組與發光 條之間的距離可以縮減，以達到降低燈箱的整體厚度的目 的。 舉例而言’以目前使用發光二極體作為顯示器之直下 式背光模組為例，其擴散板與框架底部之間的距離不可低 於18mm，才能夠確保發光二極體的混光均 僂 統背光模組中的燈箱厚度至少有18麵以上3』3 明之發光條可以使蓋板或光學膜組與框架底部之間的距 縮短至10公釐以下，換言之，本發明之燈箱厚度可縮減至 10公釐以下。 雖然本發明已以實施例揭露如上，祕並_以限定 本發明’任何所屬技術領域巾具有通常知識者，在不脫離 本發明之精神和範圍内’當可作些許之更動與潤飾，故本 IS1 15 1360619 P53970054TW 29485twf.doc/d 發明之保護範㈣視後社申料财㈣所界定者為準。 【圖式簡單說明】 μ圖1A至圖1D是根據本發明之數個實施例的薄型燈 箱的剖面示意圖。 圖2至圖3是根據本發明之實施例之薄型燈箱内的發 光條的結構示意圖。 圖4Α至圖4Ε是根據本發明之實施例之發光條的導光 條結構示意圖。 圖5至圖10為本發明多個實施例之發光條之光場示 意圖。 圖11Α至圖11Β分別為根據本發明一實施例之薄型燈 箱之光場分佈圖以及光場強度分佈圖。 圖12Α至圖12Β分別為根據本發明一實施例之薄型燈 箱之光場分佈圖以及光場強度分佈圖。 圖13Α至圖13Β分別為根據本發明一實施例之薄型燈 箱之光場分佈圖以及光場強度分佈圖。 【主要元件符號說明】 10 :框架 10a :底部 10b :侧壁 12 :發光條 14 ·盖板 15 :反射層 1360619 P53970054TW 29485twf.doc/d 16 :光學膜組 S :容納空間 D :距離 110 :光源 110a、110b :光線 120 :導光條 122 :光出射面 124 :光入射面.. 126 :微結構 d :間距The profile of the direction. In addition, the weight intensity distribution of the thin light box is as shown in Fig. 12B, wherein the X axis of the ® 12B towel indicates the position of the thin light box, and the Y axis indicates the light field intensity. Shaft 153 14 1360619 P53970054TW 29485twf.doc/d Example 3 Shell example 3 is a thin light box with the light strips as shown in Figure id lying side by side. The v-shaped microstructure apex angle of each set of illuminating strips in this example is greater than 14 。. The light field distribution of the thin light box is as shown in Fig. 13' where the curve β is a section of the light field in the X direction, and the curve ruler is a section of the light field in the direction of the ¥. In addition, the light field intensity distribution of the thin light box is as shown in Fig. 13A, wherein the X axis in Fig. 13A indicates the position of the thin light box, and the γ axis indicates the light field intensity. In summary, the light bar in the light box structure of the present invention is composed of a light guide and a light source. The light passing through the light guide bar and the light guide bar can design the light of the light source to have a light bar after exiting the light guide bar. The special light field distribution, so that the light emitted by each light bar can achieve a good light mixing effect within a short distance. Therefore, the distance between the cover of the light box and the optical film group and the light strip can be reduced to achieve the purpose of reducing the overall thickness of the light box. For example, in the case of a direct-lit backlight module that uses a light-emitting diode as a display, the distance between the diffuser plate and the bottom of the frame must not be less than 18 mm to ensure the light-mixing of the light-emitting diodes. The thickness of the light box in the backlight module is at least 18 or more. The light-emitting strip can shorten the distance between the cover or the optical film group and the bottom of the frame to less than 10 mm. In other words, the thickness of the light box of the present invention can be reduced to 10 mm or less. The present invention has been disclosed in the above embodiments, and the present invention is not limited to the spirit and scope of the invention, and may be modified and retouched without departing from the spirit and scope of the invention. IS1 15 1360619 P53970054TW 29485twf.doc/d The protection model of the invention (4) shall be subject to the definition of the post-property application (4). BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A to Fig. 1D are schematic cross-sectional views of a thin lamp box in accordance with several embodiments of the present invention. 2 to 3 are structural views of a light-emitting strip in a thin type light box according to an embodiment of the present invention. 4A to 4B are schematic views showing the structure of a light guiding strip of a light-emitting strip according to an embodiment of the present invention. 5 through 10 are schematic illustrations of light fields of a light strip in accordance with various embodiments of the present invention. 11A to 11B are respectively a light field distribution diagram and a light field intensity distribution diagram of a thin type light box according to an embodiment of the present invention. 12A to 12B are respectively a light field distribution diagram and a light field intensity distribution diagram of a thin type light box according to an embodiment of the present invention. 13A to 13B are respectively a light field distribution diagram and a light field intensity distribution diagram of a thin type light box according to an embodiment of the present invention. [Main component symbol description] 10: Frame 10a: Bottom 10b: Side wall 12: Light-emitting strip 14 • Cover 15: Reflective layer 1360619 P53970054TW 29485twf.doc/d 16 : Optical film set S: accommodation space D: Distance 110: Light source 110a, 110b: light 120: light guide bar 122: light exit surface 124: light incident surface: 126: microstructure d: pitch