200540476 九、發明說明： 【發明所屬之技術領域】 本發明係關於一薄發光面板，其包括一發光窗及一位於 其對面之後壁及至少一光導入邊緣以用於將來自一光源之 光舞合於該發光面板。 本發明亦係關於一種具有上述發光面板之照明系統。 【先前技術】 此等發光面板本身已知，且其亦表示邊緣發光面板。其 ί 可尤其用作（圖片）顯不裝置（諸如用於電視機及監視器）中 的月光發射面板。此等發光面板尤其適合用作非發射性顯 示器（諸如液晶顯示裝置，其亦表示為LCD面板）之背光: 其可用於（攜帶型）電腦或（攜帶型）電話。 一具有像素規則圖案之基板，其200540476 IX. Description of the invention: [Technical field to which the invention belongs] The present invention relates to a thin light-emitting panel, which includes a light-emitting window and a rear wall opposite to the light-emitting window and at least one light introduction edge for dancing light from a light source Combined with the light-emitting panel. The invention also relates to a lighting system having the above-mentioned light-emitting panel. [Prior Art] These light emitting panels are known per se, and they also represent edge light emitting panels. It can be used especially as a moonlight emission panel in (picture) display devices such as televisions and monitors. These light-emitting panels are particularly suitable for backlighting non-emissive displays, such as liquid crystal display devices, which are also referred to as LCD panels: they can be used in (portable) computers or (portable) telephones. A substrate with a regular pattern of pixels, which
該等顯示裝置通常包括一具有像素 中每一像素均由至少一電極控制。M 電路以在（圖片）顯示裝置之（圖片）顯 99097.doc 200540476 用為將此等發光面板用於照明廣告板。 在開篇中所提及之發光面板中，所用光源通常為一管狀 低壓水銀蒸汽放電燈，例如一或若干個所謂之冷陰極螢光 燈（CCFL) ’其中在操作過程中由光源發射的光被耦合於充 當光波導管之發光面板。此波導管通常構成一較薄且為平 面之面板，其由（例如）合成樹脂或玻璃製成，且其中光在 (全）内反射的影響下被傳送穿過光波導管。 作為一替代性光源，此發光面板亦可具有複數個發光二 極體（LED)。通常在鄰近發光面板之光透射邊緣表面處或 與其相切處提供此等光源，在此情況下源於光源的光在操 作過私中入射於該光透射邊緣表面上並使其自身分佈於面 板内。 用於知、明影像顯示裝置之發光面板自國際專利申請案 WO-A 01/88 430中已知。該已知之影像顯示裝置包括一光 調變面板、一配置於該光調變面板對面之照明裝置及一連 接至該照明裝置之光源。該照明裝置包括至少一分離層， 忒分離層具有平行於該光調變面板而延伸之至少一平面及These display devices usually include a pixel having each pixel controlled by at least one electrode. The M circuit is used to display the (picture) on the (picture) display device. 99097.doc 200540476 This light-emitting panel is used to illuminate advertising boards. In the light-emitting panel mentioned in the opening paragraph, the light source used is usually a tubular low-pressure mercury vapor discharge lamp, such as one or several so-called cold-cathode fluorescent lamps (CCFL), where the light emitted by the light source during operation is Coupled to a light emitting panel that acts as a light waveguide. This waveguide usually constitutes a thin and flat panel made of, for example, synthetic resin or glass, and in which light is transmitted through the optical waveguide under the influence of (total) internal reflection. As an alternative light source, the light-emitting panel may also have a plurality of light-emitting diodes (LEDs). These light sources are usually provided adjacent to or tangential to the light-transmitting edge surface of the light-emitting panel, in which case light originating from the light source incident on the light-transmitting edge surface during operation and distributes itself to the panel Inside. A light-emitting panel for an image display device is known from the international patent application WO-A 01/88 430. The known image display device includes a light modulation panel, a lighting device disposed opposite the light modulation panel, and a light source connected to the lighting device. The lighting device includes at least one separation layer, and the 忒 separation layer has at least one plane extending parallel to the light modulation panel and
-位於背離該+面之一側上的鋸齒狀表面。職齒狀表面 包a諸夕鋸齒狀並列凸起，其各自由第一及第二分離表面 分界，其中該第一分離表面與平面圍成一銳内角，且該第 二分離表面與平面圍成一_肖。該已知發光面板之一缺 點為發光面板之效率相對較低。 【發明内容】 本毛月所具有之其目標為完全或部分地消除上述缺點 99097.doc 200540476 根據本發明，用於此目的之開篇中所提及的種類之發光面 板包括： 一發光窗及一位於該發光窗對面之後壁， 至少一光導入邊緣，其用於將來自一光源之光耦合於發 光面板’其中光在操作過程中在發光面板内傳播。 發光面板，其具有複數個狹縫以用於將光自發光面板耦 合出，-A jagged surface on the side facing away from the + face. The tooth-shaped surface includes a zigzag side-by-side protrusion, each of which is delimited by a first and a second separation surface, wherein the first separation surface forms an acute inner angle with the plane, and the second separation surface forms a plane with the plane. One_Xiao. One disadvantage of the known light-emitting panel is that the efficiency of the light-emitting panel is relatively low. [Summary of the Invention] The goal of this month is to completely or partially eliminate the above disadvantages 99097.doc 200540476 According to the present invention, the types of light-emitting panels mentioned in the opening paragraph for this purpose include: a light-emitting window and a Located at the rear wall opposite to the light emitting window, at least one light introduction edge is used to couple light from a light source to the light emitting panel, wherein the light is propagated in the light emitting panel during operation. A light-emitting panel having a plurality of slits for coupling light from the light-emitting panel,
狹縫’其自後壁延伸至發光窗， 狹縫中之材料，其具有一不同於發光面板之折射率的折 射率。 在此專利申請案中，將一狹縫理解為發光面板内之一相 、皆狹乍之開口，5亥狹縫穿過發光面板而自後壁延伸至發光 窗。 x 因為狹縫中之材料具有一不同於發光面板材料之折射率 、斤射率所以光自發光面板被耦合出。在發光面板與狹 縫之間的介面處的折射率之變化導致反射，從而致使光被 麵合出發光面板。 藉由根據本發明之措施獲得一尤其緊湊之發光面板。藉 此尤其在(圖片)顯示裝置之情形中實現了相對高的效率。 根據本發明之發光面板之一較佳實施例的特徵為光藉由 兄反射：大體上自發光面板被耦合出。在已知發光面板 中’通常猎由使用光散射來獲取光之均一性。光散射 :它漫射結構產生發光面板之半透明但並非透明之發光 由由於知用了政射光’所以用作（背光）發光體之已知發 99097.doc 200540476The slit 'extends from the back wall to the light-emitting window, and the material in the slit has a refractive index different from the refractive index of the light-emitting panel. In this patent application, a slit is understood as a phase in the light-emitting panel, which is a narrow opening, and the 50-hour slit passes through the light-emitting panel and extends from the rear wall to the light-emitting window. x Because the material in the slit has a refractive index and emissivity different from those of the light-emitting panel material, light is coupled out of the light-emitting panel. The change in the refractive index at the interface between the light-emitting panel and the slit causes reflection, thereby causing light to be combined into the light-emitting panel. By means of the measures according to the invention, a particularly compact light-emitting panel is obtained. As a result, relatively high efficiency is achieved, especially in the case of (picture) display devices. A preferred embodiment of the light-emitting panel according to the present invention is characterized in that light is reflected by the sibling: substantially self-emitting panel is coupled out. In the known light-emitting panel, the light homogeneity is usually obtained by using light scattering. Light Scattering: Its diffuse structure produces translucent but not transparent luminescence of a light-emitting panel. It is known as a (backlight) luminous body due to the use of political light. 99097.doc 200540476
光面板的效率被限制至大約50%，此對於一般照明應用而 言太低。基於光散射之已知發光面板的另一缺點為光被發 射為所謂的朗伯發射體（具有較大表面積）。朗伯發射使發 光面板不適合用於一般照明目的且效率很低。此外，若用 於自發光面板耦合光之機制為漫射，則不能使用關於光方 向之貧訊。當光被漫散射時，發射光之方向被隨機化，從 而使得在朝面板之前表面及後表面的方向之間沒有差異。 因此，基於光散射之已知發光面板自發光窗以及自後壁或 多或少等同地發射，除非在後壁位置處使用一鏡面以阻擋 彼方向上之光的發射。 藉由採用大體上之鏡面反射，當朝發光面板看時可看見 光源或該等個別光源。當使用多個離散光源（諸如led) 4 ’此等光源之亮度在各個狹縫中被"反射”，從而造成閃 光效應。此閃光效應給予發光面板一動態特徵，因為當觀 察者改變他/她相對於發光面板的位置時，光源似乎移 動。藉由應用具有各種顏色之離散光源而大體上增強此閃 光效應。 在將鏡面反射用於將光自發光面板耦合出之另一優點為 產生了一大體上透明之發光體，其大體上僅在一方向上發 射光，意即，該發光面板僅自發光窗發射光且實際上沒^ 光自該發光面板之後壁發射。以此方式，產生了一種，，遮 光板，，或，，光簾”。對於觀眾而言，可在一自後壁朝發光窗 之方向上（意即在由發光面板照明之區域的方向上）透視發 光面板，同時在相反方向上觀眾主要觀察光源在發光面板 99097.doc 200540476 t之各個狭縫處的反射。若光源亮度相對較高，則此等反 射可具有之結果為當觀眾設法在一自發光窗朝後壁之方向 上透視發光面板時，其無法看見發光面板後面之事物。 基於光散射之發光面板僅部分透明。基於鏡面反射之發 光面板則大體上透明。可清楚地透視根據本發明之發光面 板。透明發光面板使得能夠設計及製造具有新穎且逑人外 觀之新穎類別的發光體。根據本發明，基於光學透明之發 光面板的發光面板為一簡單、堅固且易於使用的單件光 ，瓦。 較佳地，發光面板之狹縫填充有一介電材料。由於狹縫 中之介電材料的折射率不同於發光面板材料的折射率，所 以光自發光面板耦合出。在發光面板與狹縫中之介電材料 之間的介面處的折射率之改變引起反射，從而致使光耦合 出發光面板。 根據本發明之發光面板之一極有利實施例的特徵為狹縫 • 填充有空氣。根據定義，空氣折射率為1。發光面板的折 射率通常為約丨·5，其取決於發光面板的材料。在發光面 板與狹縫中之空氣之間的介面處的折射率之改變引起反 射’從而致使光耦合出發光面板。 根據本發明之發光面板之一較佳實施例的特徵為狹縫大 體上為平*。不難製造具有平面狹縫之發光面板，例如可 藉由田射切割而製得。較佳地，該等狹縫相對於彼此大體 j平仃。不難製造具有平面平行之狹縫的發光面板，例如 藉由雷射切割而製得。 99097.doc -10- 200540476 狹縫在發光面板中的定向決定了光自發光面板轉合出的 位置。為此’根據本發明之發光面板的一較佳實施例之特 徵為將狹缝定向於發光面板中，以促使狹縫至光導入邊緣 的距離自發光窗朝後壁遞減。以此方式入射於光導入邊緣 處之光在狹縫處反射，且在發光窗處自發光面板耦合出。 在該發光面板之-較佳實施例中，該等狹縫以與發光窗 上之法線具有角度α之方式排列，其中該角度在1〇。如8〇〇 範圍内。較佳地，該角度《在30。^^4〇。範圍内。當該等狹 縫填充有空氣時，30。^〇^4〇。角度範圍尤為適合。選擇一 在30。至40。範圍内的角度能夠獲得一大體上對稱之光分 佈。 在該發光面板之-有利實施例中，可獲得由發光窗發射 之光的大體上均一的通量密度。為此，根據本發明之發光 面板之一較佳實施例的特徵為狹縫長度及狹縫之間的間距 相對於光導入邊緣而變化。較佳地，相對於光導入邊緣， φ 狹縫長度增加而狹縫之間的間距減小。在接近光導入邊緣 處，將光耦合出發光面板之係數選擇得相對低，因為此部 分發光面板中可獲得相對多的通量。在離光導入邊緣距離 較遠之距離處，將光耦合出發光面板之係數選擇得較大， 因為已耦合出了部分光通量。 在根據本發明之發光面板之一替代性實施例中，在一平 行於光導入邊緣之線中的狹縫數目隨離光導入邊緣之距離 而增加，使得在離光導入邊緣具有相同距離處狹縫的總有 效長度增加。以此方式，狹縫數目及狹縫長度作為離光導 99097.doc -11 - 200540476 入邊緣之距離的函數而增加。 根據本發明之發光面板之另一較佳實施例的特徵為該發 光面板包括位於光導入邊緣對面之另一邊緣’該另一邊緣 具有-鏡面反射器或一漫反射器。鏡面反射使光能夠自發 光面板耦合出亦能在發光面板之後壁處耦合出。漫反射使 光能夠在發光面板之後壁處自發光面板漫射性地耦合出。 在後一情況下，發光窗處之光完全透明而由後壁發射之光 則被漫射性地發射。 在發光面板之一較佳實施例中，該發光面板具有一感測 器，其用於量測在操作過程中由發光面板發射之光的光學 性能。以此方式，獲得了對發光面板之光輸出的動態控 制此外，该感測器亦可用於調整由個別光源發射的光以 (例如）補償溫度效應。 根據本發明之發光面板的另一較佳實施例之特徵為發光 面板包括另一導入邊緣，其用於將光自另一光源耦合於發 光面板忒另導入邊緣位於該光導入邊緣對面，該後壁 充田另一發光窗。若藉由獨立光源而在兩個導入邊緣處將 光耦合於發光面板，則源自一邊緣的光僅被導引至發光面 板之-側(發光窗），且來自另一導入邊緣的光由充當該另 一發光窗之後壁發射。若（舉例而言）將發光面板水平安 裝，則部分光被導引朝向天花板（間接環境照明），且另一 W /刀光被導引遠離天花板（功能直接照明）。此外，可獨立 地控制導引於兩個方向上的光(強度、顏色)。 本毛月亦係、關於一具有上文所提及的發光面#反之照明系 99097.doc 200540476 統。根據本發明，一具有開篇中所提及之種類的發光面板 之a明系統的特徵為：光導入邊緣與單一光源或與複數個 光源相關聯。較佳地，該等複數個光源包括具有不同光發 射波長之至少兩個發光二極體（LED)。顏色可藉由適當地 使用LED而以所要之方式混合，（例如）以形成具有所要色 溫之白光。該等LED較佳地包括本身已知之紅、綠及藍 led的組合，或者（例如）紅、綠、藍及琥珀色led的組 a具有二種光發射波長之LED亦可藉由兩個具有不同光 發射波長的LED實現，其中該等類型中之一類型的LED(部 分地）具有一磷光體，使得LED之光發射被磷光體轉化成具 有第三所要之光發射波長的光。紅、綠及藍LED之本身已 知的組合使其可獨立於顯示裝置之狀態而實現顏色改變。 使用LED具有另一優點：可獲得動態照明的可能性。為 此在其中一個邊緣表面處存在一用於量測在操作過程中 由光源發射之光的光學性能的感測器。 由於發光二極體之光通量被改變，所以可調整由led發 射之光的量。對光通量之此控制通常以能效方式進行。可 在無明顯功效損耗的情況下使led變暗。較佳地，由發光 一極體發射之光的強度可變化以回應於所要之照度級或回 應於環境光級。 較佳地，該等發光二極體各自具有一至少為10 的光 通量。具有如此高輸出的LED亦表示為LED電源封裝。使 用此高效率、高輸出之LED具有之特定優點為一所要之相 對高的光輸出所需之LED的數目相對少。此有利於待製造 99097.doc -13- 200540476 之發光面板的緊湊結構及效率。使用led之另一優點為一 具有LED之發光面板的相對很長的有效壽命、相對低的能 源成本及低維護成本。 【實施方式】 圖1根據本發明之一實施例示意性地展示了一包括發光 面板1之明糸統的側面正視圖。該發光面板1由一光透射 材料製成。發光面板1可由（例如）合成樹脂、由丙烯、由聚 碳酸脂、由PMMA(例如珀斯佩克斯有機玻璃）或由玻璃製 ^ 造而成。在操作過程中，利用全内反射（TIR)將光傳送穿 過發光面板1。該面板具有一前壁或發光窗2及一與其相對 之後壁3。此外，在發光面板丨之發光窗2與後壁3之間存在 至少一光導入邊緣4以用於將來自光源6B，6G，6R之光耦 合於發光面板1，其中在操作過程中光在發光面板丨中傳 播。在圖1之實施例中，光導入邊緣4與複數個光源6β， 6G，6R(例如，諸多個發光二極體（led))相關聯。該等 • led較佳地安裝於一（金屬芯子）印刷電路板上。當在此（金 屬芯子）印刷電路板（PCB)上提供電源LED時，由該等LED 產生之熱量可不難由PCB藉由熱傳導而移除。在一替代實 知例中，光導入邊緣4僅與-光源（圖！中未展示）相關聯， 例如一管狀低壓水銀蒸汽放電燈，例如一或 冷陰極螢光燈（CCFL)。 根據本發明，發光面板1具有複數個狹縫8，8,，8，，...以 用於將光自發光面板⑴耦合出。狹縫8, 8，，8，，自後辟3 延伸至發光窗2。為激勵光麵合出發光面板】，狹縫8，二 99097.doc -14- 200540476 8’’.·.中之材料具有一不同於發光 率。 坂1之折射率的折射 在圖1之實例中，狹縫8，8，，8，，埴亡士 _.·具兄有空氣。在一 代性實施例中，該等狹縫填充有一介 曰 ^ V+ Λ.. 才在發光面板 與狹縫中之介電材料之間的介面處的折射率之改 ^ 射’從而致使光耦合出發光面板。 反 狹縫在發光面板中之定向判定了光自發光面板^ 的位置。在圖1之實例中，該等狹縫8，8， 5 8 ···相對於彼 此大體上平行。此外，該等狹縫8，8,，8，， ^ 5 ··.疋向於發光面 中以促使狹縫8’ 8’，8"·..至光導入邊緣4之距離自發光 窗2朝後壁3遞減。以此方式入射於光導入邊緣斗處的^在 狹縫8, 8，，8，，.··處反射，且在發光窗2處自發光面板丨耦合 出。 〇 較佳地，光藉由鏡面反射而大體上自發光面板1輪合 出。以此方式，發光面板大體上透明。可清晰地看透圖工 中的發光面板1。透明發光面板使得能夠設計及製造具有 新穎且迷人外觀的新穎類別之發光體。 為獲得由發光窗1發射之光的大體上均一的通量密产， 狹縫8，8,，8，，.·.的長度及狹縫8，8,，8，，···之間的間距相 對於光導入邊緣4變化。在圖1中，可看見作為相對於光導 入邊緣4之距離的函數，狹縫8，8,，8，，···之長度增加，而 狹縫8 ’ 8’ ’ 8…之間的間距遞減（亦見圖3)。在接近光導 入邊緣4處，將光耦合出發光面板1之係數選擇得相對低， 因為在此部分發光面板1中可獲得相對多的通量。在離光 99097.doc -15- 200540476 導入邊緣4較遠的距離處，將光耦合出發光面板丨之係數選 擇侍較大’因為已搞合出了部分光通量。 在一替代實施例巾，該發光面板具有位於光導入邊緣4 對面之另一光導入邊緣5，該另一邊緣5具有一鏡面反射器 或-漫反射器。在又-實施例中，發光面板包括另一用於 將來自另-光源（圖1中未展示）之光輕合於發光面板的導入 邊緣，該另一導入邊緣位於該光導入邊緣對面。在後一實 施例中’後壁3充當另一發光窗。 、 發光面板!可進一步具有一感測器1〇，其用於量測在操 作過程中由發光面板i發射之光的光學性能。感測器1〇搞 接至電子控制器⑷中未展示)，以用於適當地調適光源 6B ’ 6G ’ 6R之光通量。可藉由感測器1〇及電子控制器實 :-反饋機構，以用於影響自發光面板⑶合出之光的品 質及量。以此方式，獲得了對發光面板k光輸出的動態 控制此外，感測器10亦可用於調整由個別光源發射的 光二（例如）以補償溫度效應。在一替代性實施例中，在發 光窗上提供感測器。 圖2不思性地展示了如圖}所示之照明系統的細節的截面 圖"展不了諸多光射線。該等光射線產生於光源6g。圖 2中展示了 一用於在光導入邊緣*之方向上混合並引導光射 、本的引V腔15。引導腔15之一内壁可具有—反射表面，該 射表面較佳地具有鏡面反射性。為便於追蹤圖2中的光 、、、 ^諸夕箚頭來指該等光射線。在圖2中，光在狹縫 8，8，， ···之位置處自發光面板1被耦合出。狹縫8，8,，… 99097.doc -16- 200540476 自後壁3延伸至發光窗2。 在圖2中，狹縫8，8，，…以相對於發光窗2上之法線“具 有角度α之方式排列，其中該角度在1〇。仏$8〇。範圍内。較 佳地，該角度°^在3〇%〇^40。範圍内。當狹縫8，8,，…填充 有空氣時，30%〇^40。角度範圍尤為適合。選擇在3〇。至4〇。 範圍内的角度使得能夠獲得一大體上對稱之光分佈。倘若 發光面板1由ΡΜΜΑ(η=1_49)製成且狹縫8，8,，…填充有空 氣（η=ι)，則較佳地將角度以選擇為約36。。在角度以之此值 下，由發光® 1發射之光關於法線丨8而與發光窗2大體上對 稱。在法線18周圍可獲得光之最大強度，且在法線18之左 側及右側處由發光面板丨的發光窗2發射相當量的光通量。 圖3根據本發明之一實施例示意性地展示了發光面板^中 之狹縫8，8’，8"，…的一典型配置。在鄰近光導入邊緣4 處相對較高數目之狹縫8，8,，8，，，…具有相對較短的長 度。在離光導入邊緣4具有較遠距離處，狹縫8，8，， 8” ’…的數目遞減而長度則逐漸增加。在接近光導入邊緣 4處，將光耦合出發光面板丨之係數相對低，而在離光導入 邊緣4具有較遠距離處，將光耦合出發光面板丨之係數則相 對較大。以此方式，獲得了由發光窗2發射之光的大體上 均一之通量密度。 在如圖3所示之發光面板的實施例中，在一平行於光導 入邊緣之線中的狹縫的數目隨離光導入邊緣之距離而增 加，使得在離光導入邊緣具有相同距離處的狹縫之總有效 長度增加。以此方式’狹縫之數目及狹縫之長度作為離光 99097.doc 17 200540476 導入邊緣之距離的函數而增加。 f發光面板之一替代實施例中，狹縫填充有具有不同折 射指數的材料。此為用於控制光耦合出發光面板的另一方 牛例而g，藉由選擇具有合適折射指數的適當材料， 狹縫之長度可作為至光導入邊緣之距離的函數而相同，其 中折射率的變化判定了自發光面板耦合出光的百分數。 根據本發明之發光面板為—具有相對高發光功效之尤為 緊湊的發光面板。 ’應注意到，上述實施例說明了本發明而非限制本發明， 且热習此項技術者可在不脫離附加之申請專利範圍的前提 下旎夠設計許多替代實施例。在該等申請專利範圍中，置 於括號之間的任何參考符號均不應解釋為限制該申請專利 範圍。動詞”包含”及其動詞變化形式之使用並不排斥存在 除申請專利範圍中所陳述的彼等元件或步驟之外的元件咬 步驟。元件前之冠詞”一 ”並不排斥存在複數個此等元件。 Φ 本發明可藉由包括若干不同元件之硬體及藉由經適當程式 化之電腦來建構。在列舉若干構件的裝置申請專利範圍 中，可糟由硬體之同一物件來體現此等構件中之若干構 件。事實為在相互不同之相關申請專利範圍中所陳述的特 定措施並不指示不能有利地使用此等措施之一組。 【圖式簡單說明】 圖1為根據本發明之一實施例一包括一發光面板之照明 系統的側面正視圖； 圖2為如圖1中所示之照明系統的細節的截面視圖，其展 99097.doc -18 - 200540476 示了諸多光射線，及 圖3為根據本發明之一實施例發光面板中之狹縫的典型 酉己置。 該等圖僅為概略圖，且並未按比例繪製。某些尺寸出於 清晰之目的可被特別強烈地誇示。同等組件在該等圖中已 被給予了盡可能多的參考數字。 【主要元件符號說明】The efficiency of light panels is limited to about 50%, which is too low for general lighting applications. Another disadvantage of known light-emitting panels based on light scattering is that the light is emitted as a so-called Lambertian emitter (with a large surface area). Lambertian emission makes the light-emitting panel unsuitable for general lighting purposes and inefficient. In addition, if the mechanism used to couple the light from the self-luminous panel is diffuse, it is not possible to use a poor signal about the direction of the light. When light is diffusely scattered, the direction of the emitted light is randomized so that there is no difference between the directions toward the front surface and the rear surface of the panel. Therefore, known light-emitting panels based on light scattering emit more or less equally from self-illuminating windows and from the rear wall unless a mirror is used at the position of the rear wall to block the emission of light in that direction. By using a substantially specular reflection, the light source or the individual light sources can be seen when looking at the light emitting panel. When multiple discrete light sources (such as LEDs) are used 4 'the brightness of these light sources is " reflected in each slit ", thereby causing a flash effect. This flash effect gives the light-emitting panel a dynamic characteristic because when an observer changes his / The light source seems to move when she is positioned relative to the light-emitting panel. This flash effect is substantially enhanced by applying discrete light sources with various colors. Another advantage of using specular reflection to couple light from the light-emitting panel is that A substantially transparent luminous body that emits light only in one direction, meaning that the light-emitting panel emits light only from the light-emitting window and virtually no light is emitted from the rear wall of the light-emitting panel. In this way, a A kind of, sunshade, or, light curtain. " For the viewer, the light-emitting panel can be seen through from the back wall toward the light-emitting window (meaning in the direction of the area illuminated by the light-emitting panel), while in the opposite direction, the audience mainly observes the light source on the light-emitting panel 99097.doc 200540476 t Reflection at each slit. If the brightness of the light source is relatively high, these reflections can have the result that when the viewer tries to see through the light-emitting panel in a direction from the light-emitting window toward the rear wall, he cannot see what is behind the light-emitting panel. Light-emitting panels based on light scattering are only partially transparent. The luminescent panel based on specular reflection is substantially transparent. The light emitting panel according to the present invention can be clearly seen. Transparent light-emitting panels make it possible to design and manufacture light-emitting bodies with novel and unobtrusive new categories. According to the present invention, a light-emitting panel based on an optically transparent light-emitting panel is a simple, robust, and easy-to-use one-piece light tile. Preferably, the slit of the light-emitting panel is filled with a dielectric material. Since the refractive index of the dielectric material in the slit is different from that of the light-emitting panel material, light is coupled out of the light-emitting panel. A change in the refractive index at the interface between the light-emitting panel and the dielectric material in the slit causes reflection, thereby causing light to be coupled out of the light-emitting panel. One very advantageous embodiment of the light-emitting panel according to the invention is characterized in that the slits are filled with air. By definition, the refractive index of air is 1. The refractive index of a light-emitting panel is usually about 5 · 5, which depends on the material of the light-emitting panel. A change in the refractive index at the interface between the light-emitting panel and the air in the slit causes reflection ', thereby causing light to be coupled out of the light-emitting panel. A preferred embodiment of the light emitting panel according to the present invention is characterized in that the slits are substantially flat *. It is not difficult to manufacture a light-emitting panel with a flat slit, for example, it can be produced by field-cutting. Preferably, the slits are substantially parallel to each other. It is not difficult to manufacture a light-emitting panel having slits that are parallel to each other, for example, by laser cutting. 99097.doc -10- 200540476 The orientation of the slits in the light-emitting panel determines where the light is turned from the light-emitting panel. To this end, a preferred embodiment of the light-emitting panel according to the present invention is characterized in that the slit is oriented in the light-emitting panel so that the distance from the slit to the edge of the light introduction decreases from the light-emitting window toward the rear wall. The light incident on the light introduction edge in this way is reflected at the slit and is coupled out of the light emitting panel at the light emitting window. In a preferred embodiment of the light-emitting panel, the slits are arranged in such a manner as to have an angle α with a normal line on the light-emitting window, where the angle is 10. Such as within the range of 800. Preferably, the angle is "at 30." ^^ 4〇. Within range. When the slits are filled with air, 30. ^ 〇 ^ 4〇. The angular range is particularly suitable. Choose one at 30. To 40. Angles in the range can achieve a substantially symmetrical light distribution. In this advantageous embodiment of the light emitting panel, a substantially uniform flux density of the light emitted by the light emitting window can be obtained. For this reason, a preferred embodiment of the light emitting panel according to the present invention is characterized in that the length of the slits and the interval between the slits are changed with respect to the edge of the light introduction. Preferably, the length of the φ slit is increased and the pitch between the slits is decreased with respect to the light introduction edge. The coefficient for coupling light out of the light-emitting panel near the edge of the light introduction is selected to be relatively low, because a relatively large amount of flux can be obtained in this part of the light-emitting panel. At a longer distance from the edge where the light is introduced, the coefficient for coupling light out of the light-emitting panel is chosen to be larger because a portion of the light flux has been coupled. In an alternative embodiment of the light-emitting panel according to the present invention, the number of slits in a line parallel to the light-introducing edge increases with the distance from the light-introducing edge, so that it is narrow at the same distance from the light-introducing edge. The total effective length of the seam increases. In this way, the number of slits and the length of the slits are increased as a function of the distance from the light guide 99097.doc -11-200540476 into the edge. Another preferred embodiment of the light emitting panel according to the present invention is characterized in that the light emitting panel includes another edge 'opposite to the light introduction edge, and the other edge has a specular reflector or a diffuse reflector. The specular reflection enables light to be coupled out of the light emitting panel as well as at the rear wall of the light emitting panel. Diffuse reflection enables light to be diffusely coupled out of the light emitting panel at the rear wall of the light emitting panel. In the latter case, the light at the light emission window is completely transparent and the light emitted from the back wall is diffusely emitted. In a preferred embodiment of the light-emitting panel, the light-emitting panel has a sensor for measuring the optical performance of light emitted by the light-emitting panel during operation. In this way, dynamic control of the light output of the light-emitting panel is obtained. In addition, the sensor can also be used to adjust the light emitted by individual light sources to, for example, compensate for temperature effects. Another preferred embodiment of the light-emitting panel according to the present invention is characterized in that the light-emitting panel includes another lead-in edge for coupling light from another light source to the light-emitting panel. The other lead-in edge is located opposite the light-leading edge. Bi Chongtian another illuminated window. If light is coupled to the light-emitting panel at two leading edges by independent light sources, the light from one edge is only guided to the-side (light-emitting window) of the light-emitting panel, and the light from the other leading edge is Acting as the other illuminated window, the wall is emitted. If (for example) a light-emitting panel is mounted horizontally, part of the light is directed towards the ceiling (indirect ambient lighting) and another W / knife light is directed away from the ceiling (functional direct lighting). In addition, light (intensity, color) guided in both directions can be controlled independently. This month is also related to a lighting system with the above-mentioned luminous surface. Conversely, the lighting system is 99097.doc 200540476. According to the present invention, a lighting system having a light-emitting panel of the kind mentioned in the opening paragraph is characterized in that the light introduction edge is associated with a single light source or with a plurality of light sources. Preferably, the plurality of light sources include at least two light emitting diodes (LEDs) having different light emission wavelengths. Colors can be mixed in a desired manner by using LEDs appropriately, for example, to form white light with a desired color temperature. The LEDs preferably include a combination of red, green, and blue LEDs known per se, or, for example, a group a of red, green, blue, and amber LEDs having two types of light emission wavelengths. LEDs with different light emission wavelengths are realized, wherein one of these types of LEDs (partially) has a phosphor, so that the light emission of the LED is converted by the phosphor into light having a third desired light emission wavelength. The known combination of red, green and blue LEDs makes it possible to achieve color changes independently of the state of the display device. Using LEDs has another advantage: the possibility of obtaining dynamic lighting. For this purpose there is a sensor at one of the edge surfaces for measuring the optical performance of the light emitted by the light source during operation. Since the light flux of the light-emitting diode is changed, the amount of light emitted by the LED can be adjusted. This control of the luminous flux is usually performed in an energy efficient manner. The LED can be dimmed without significant power loss. Preferably, the intensity of the light emitted by the light-emitting polar body may be varied in response to a desired illumination level or in response to an ambient light level. Preferably, the light-emitting diodes each have a luminous flux of at least 10. LEDs with such high output are also referred to as LED power packages. A particular advantage of using this high-efficiency, high-output LED is that the number of LEDs required for a relatively high light output is relatively small. This is conducive to the compact structure and efficiency of the light-emitting panel to be manufactured 99097.doc -13- 200540476. Another advantage of using LEDs is the relatively long effective life of a light-emitting panel with LEDs, relatively low energy costs, and low maintenance costs. [Embodiment] Fig. 1 schematically shows a side elevational view of a bright system including a light emitting panel 1 according to an embodiment of the present invention. The light emitting panel 1 is made of a light transmitting material. The light-emitting panel 1 may be made of, for example, synthetic resin, acrylic, polycarbonate, PMMA (such as Perth Perspex), or glass. During operation, total internal reflection (TIR) is used to transmit light through the light-emitting panel 1. The panel has a front wall or light-emitting window 2 and a rear wall 3 opposite thereto. In addition, there is at least one light introduction edge 4 between the light-emitting window 2 and the rear wall 3 of the light-emitting panel, for coupling light from the light sources 6B, 6G, 6R to the light-emitting panel 1, wherein the light is emitted during operation Spread in the panel. In the embodiment of FIG. 1, the light introduction edge 4 is associated with a plurality of light sources 6β, 6G, 6R (for example, a plurality of light emitting diodes). These • LEDs are preferably mounted on a (metal core) printed circuit board. When power LEDs are provided on this (metal core) printed circuit board (PCB), the heat generated by these LEDs can be easily removed by the PCB through thermal conduction. In an alternative known example, the light introduction edge 4 is only associated with a light source (not shown in Figure!), Such as a tubular low-pressure mercury vapor discharge lamp, such as a cold cathode fluorescent lamp (CCFL). According to the present invention, the light-emitting panel 1 has a plurality of slits 8, 8, 8 ,, ..., for coupling light out of the light-emitting panel ⑴. The slits 8, 8, 8, 8 extend from the rear edge 3 to the light-emitting window 2. In order to stimulate the light surface to close the light-emitting panel], the material in the slit 8, 2 99097.doc -14- 200540476 8 '' ... has a different luminous rate. Refraction of the refractive index of Saka 1 In the example of FIG. 1, the slits 8, 8, 8, 8, and 埴 __ have air. In a one-generation embodiment, the slits are filled with a dielectric ^ V + Λ .. The refractive index of the interface between the light-emitting panel and the dielectric material in the slit is changed to cause coupling of light. Illuminated panel. The orientation of the reverse slit in the light-emitting panel determines the position of light from the light-emitting panel ^. In the example of FIG. 1, the slits 8, 8, 5 8 are substantially parallel with respect to each other. In addition, the slits 8,8,8 ,, ^ 5 ··. 疋 are oriented in the light emitting surface to promote the slits 8 '8', 8 " ... to the light introduction edge 4 from the light emitting window 2 Decreases towards the rear wall 3. In this way, the light incident at the edge of the light introduction edge is reflected at the slits 8, 8, 8 ,, ..., and is coupled out from the light emitting panel 2 at the light emitting window 2. 〇 Preferably, the light is substantially emitted from the light-emitting panel in one round by specular reflection. In this way, the light emitting panel is substantially transparent. The light-emitting panel 1 in the drawing can be clearly seen. Transparent light-emitting panels make it possible to design and manufacture a new type of light-emitting body with a novel and attractive appearance. In order to obtain a substantially uniform flux density of the light emitted by the light-emitting window 1, the length of the slits 8, 8, 8 ,, ...., and the slits 8, 8, 8, 8, ... The pitch varies with respect to the light introduction edge 4. In FIG. 1, it can be seen that as a function of the distance from the light introduction edge 4, the length of the slits 8, 8, 8,, ... increases, and the spacing between the slits 8 '8' '8 ... Decreasing (see also Figure 3). Near the light guide edge 4, the coefficient for coupling light out of the light-emitting panel 1 is selected to be relatively low, since a relatively large amount of flux can be obtained in this part of the light-emitting panel 1. At a distance far from the light introduction edge 4 of the 99097.doc -15-200540476, the coefficient for coupling light out of the light-emitting panel is relatively large, because part of the light flux has been matched. In an alternative embodiment, the light emitting panel has another light introduction edge 5 opposite to the light introduction edge 4, and the other edge 5 has a specular reflector or a diffuse reflector. In yet another embodiment, the light-emitting panel includes another lead-in edge for light-combining light from another-light source (not shown in FIG. 1) on the light-emitting panel, and the other lead-in edge is located opposite the light-leading edge. In the latter embodiment, the 'rear wall 3 serves as another light emitting window. The light-emitting panel! May further have a sensor 10 for measuring the optical performance of light emitted by the light-emitting panel i during operation. The sensor 10 is connected to an electronic controller (not shown) to appropriately adjust the luminous flux of the light source 6B '6G' 6R. The sensor 10 and the electronic controller can be used to implement a feedback mechanism for influencing the quality and quantity of light emitted from the light-emitting panel ⑶. In this way, dynamic control of the k-light output of the light-emitting panel is obtained. In addition, the sensor 10 can also be used to adjust the light emitted by individual light sources (for example) to compensate for temperature effects. In an alternative embodiment, a sensor is provided on the light emitting window. Fig. 2 is a cross-sectional view showing the details of the lighting system shown in Fig.} Without a lot of light rays. These light rays are generated from the light source 6g. Figure 2 shows a V-guide cavity 15 for mixing and guiding light in the direction of the light introduction edge *. One of the inner walls of the guide cavity 15 may have a reflective surface, which is preferably specularly reflective. In order to facilitate the tracking of the light in FIG. 2, Zhu Xi gimmick refers to these light rays. In Fig. 2, light is coupled out of the light emitting panel 1 at the positions of the slits 8, 8, .... The slits 8,8 ,, ... 99097.doc -16- 200540476 extend from the rear wall 3 to the light-emitting window 2. In FIG. 2, the slits 8, 8,... Are arranged in such a manner as to have an angle α with respect to the normal on the light-emitting window 2, where the angle is in the range of 10 ° to 80 °. Preferably, the The angle ° ^ is in the range of 30% 〇 ^ 40. When the slits 8, 8 ,, ... are filled with air, 30% ^ 40. The angle range is particularly suitable. The selection is in the range of 30% to 40%. The angle makes it possible to obtain a substantially symmetrical light distribution. If the light-emitting panel 1 is made of PMMA (η = 1_49) and the slits 8, 8,, ... are filled with air (η = ι), the angle is preferably The choice is about 36. At this value of the angle, the light emitted by Glow ® 1 is approximately symmetrical with the light window 2 about the normal line 8. The maximum intensity of light can be obtained around the normal line 18, and A considerable amount of light flux is emitted from the light-emitting window 2 of the light-emitting panel 丨 on the left and right sides of the normal line 18. Fig. 3 schematically illustrates the slits 8, 8 ', 8 " A typical configuration of ... a relatively high number of slits 8,8,8 ,, ... are relatively short in length near the light-introduction edge 4. Degrees. At a greater distance from the light introduction edge 4, the number of the slits 8, 8, 8, 8 "'... decreases gradually while the length gradually increases. The coefficient for coupling light out of the light-emitting panel 丨 near the light-introduction edge 4 is relatively low, and the coefficient for coupling light out of the light-emitting panel 丨 at a relatively long distance from the light-introduction edge 4 is relatively large. In this manner, a substantially uniform flux density of the light emitted by the light emitting window 2 is obtained. In the embodiment of the light-emitting panel shown in FIG. 3, the number of the slits in a line parallel to the light-introducing edge increases with the distance from the light-introducing edge, so that at the same distance from the light-introducing edge, The total effective length of the slit is increased. In this way, the number of slits and the length of the slits are increased as a function of the distance from the leading edge of the light 99097.doc 17 200540476. In an alternative embodiment of the f light-emitting panel, the slits are filled with materials having different refractive indices. This is another example for controlling the coupling of light out of the light-emitting panel. By selecting an appropriate material with a suitable refractive index, the length of the slit can be the same as a function of the distance to the edge of the light introduction. The change determines the percentage of light emitted from the light emitting panel. The light-emitting panel according to the present invention is an especially compact light-emitting panel having a relatively high light-emitting effect. It should be noted that the above-mentioned embodiments illustrate the invention rather than limit the invention, and those skilled in the art can adequately design many alternative embodiments without departing from the scope of the appended patent application. In the scope of such patent applications, any reference signs placed between parentheses shall not be construed as limiting the scope of the patent application. The use of the verb "comprise" and its conjugations does not exclude the presence of element biting steps other than those stated in the scope of the patent application. The article "a" before an element does not exclude the presence of a plurality of such elements. Φ The present invention can be constructed by hardware including several different components and by a suitably programmed computer. In the scope of the patent application for a device that lists several components, the same object in hardware can be used to reflect some of these components. The fact that certain measures are recited in mutually different dependent patent applications does not indicate that a group of such measures cannot be used to advantage. [Brief description of the drawings] FIG. 1 is a side elevation view of a lighting system including a light-emitting panel according to an embodiment of the present invention; FIG. 2 is a detailed cross-sectional view of the lighting system shown in FIG. .doc -18-200540476 shows many light rays, and FIG. 3 is a typical arrangement of slits in a light emitting panel according to an embodiment of the present invention. The figures are schematic and are not drawn to scale. Certain dimensions can be particularly strongly exaggerated for clarity. Equivalent components have been given as many reference numbers in these figures as possible. [Description of main component symbols]
1 發光面板 2 發光窗 3 後壁 4 光導入邊緣 5 另一光導入邊緣 6B 光源 6G 光源 6R 光源 8 狹縫 8’ 狹縫 8，， 狹縫 10 感測器 15 引導腔 18 發光窗上之法線 99097.doc 19-1 Light panel 2 Light window 3 Back wall 4 Light introduction edge 5 Another light introduction edge 6B Light source 6G Light source 6R Light source 8 Slot 8 'Slot 8, Slot 10 Sensor 15 Guide cavity 18 Method on the light window Line 99097.doc 19-