578436 A7 B7 〇9473twf.d〇c/006 五、發明說明（/ ) 本發明是有關於一種有機電激發光二極體顯示元 件，且特別是有關於一種具有光吸收層之有機電激發光二 極體顯示元件。 通訊產業已成爲現今的主流產業，特別是攜帶型的 各式通訊產品更是發展的重點，而平面顯示器爲人與機器 的溝通介面，因此顯得特別重要。現在應用在平面顯示器 的技術主要有下列幾種：電漿顯示器（Plasma Display Panel，PDP)、液晶顯示器(Liquid Crystal Display，LCD)、 無機電致發光顯示器（Electro-luminescent Display)、發光 二極體（Light Emitting Diode，LED)、真空螢光顯示器 (Vacuum Fluorescent Display)、場致發射顯示器（Field Emission Display，FED)以及電變色顯示器(Electro-chromic Display)等。然而，相較於其他平面顯示技術，有機電激 發光二極體（Organic Light Emitting Diode，OLED)以其自 發光、無視角依存、省電、製程簡易、低成本、低操作溫 度範圍、高應答速度以及全彩化等優點而具有極大的應用 潛力’可望成爲下一代的平面顯示器。 第1圖繪示爲習知有機電激發光二極體顯示元件之 剖面示意圖。請參照第1圖，習知有機電激發光二極體顯 示元件主要係由一透明基板100、多個條狀之透明陽極 102、一有機官能層104以及多個條狀之金屬陰極106所 組成。其中，透明基板100通常使用玻璃基板；透明陽極 102之材質通常爲氧化銦錫等透明導電材質；有機官能層 1〇4通常爲多層有機薄膜，其（有機官能層104)通常包 3 本紙張尺度適用中國國家標準（CNS)A4規烙（210x297公坌） (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製578436 A7 B7 〇9473twf.d〇c / 006 V. Description of the invention (/) The present invention relates to an organic electroluminescent photodiode display element, and in particular to an organic electroluminescent photodiode with a light absorbing layer Display element. The communication industry has become the mainstream industry today, especially the various portable communication products are the focus of development, and the flat panel display is the communication interface between man and machine, so it is particularly important. The technologies currently applied to flat-panel displays include the following: Plasma Display Panel (PDP), Liquid Crystal Display (LCD), Electro-luminescent Display, and Light-Emitting Diodes (Light Emitting Diode, LED), Vacuum Fluorescent Display, Field Emission Display (FED), and Electro-chromic Display. However, compared to other flat display technologies, Organic Light Emitting Diodes (OLEDs) are self-luminous, have no viewing angle dependence, save power, have a simple process, low cost, low operating temperature range, and high response speed. And full color and other advantages and has great application potential 'is expected to become the next generation of flat-panel displays. FIG. 1 is a schematic cross-sectional view of a conventional organic electroluminescent diode display element. Referring to FIG. 1, a conventional organic electroluminescent diode display element is mainly composed of a transparent substrate 100, a plurality of strip-shaped transparent anodes 102, an organic functional layer 104, and a plurality of strip-shaped metal cathodes 106. Among them, the transparent substrate 100 is usually a glass substrate; the material of the transparent anode 102 is usually a transparent conductive material such as indium tin oxide; the organic functional layer 104 is usually a multi-layer organic thin film, and the (organic functional layer 104) usually includes 3 paper sizes. Applicable to Chinese National Standard (CNS) A4 (210x297 cm) (Please read the precautions on the back before filling out this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs
I ·1 I I 1 «I H 9 ϋ «I ϋ ϋ ϋ I ϋ β ϋ ^1 ·1 n 1 ·1 n n ϋ ϋ ϋ I ϋ ϋ n n n n n n n ϋ I 578436 09473twf.doc/006 _ B7 五、發明說明（乙） (請先閱讀背面之注意事項再填寫本頁) 含有電洞注入層、電洞傳輸層、有機電激發光層、電子傳 輸層以及電子注入層等多層薄膜；而金屬陰極1〇6之材質 通常是銘、銘或鎂-銀合金等。 對於任何顯示元件而言，全亮與全暗的亮度比値是 決定其識別度好壞的重大因素，此亮度比値爲一般所稱之 對比度（Contrast Ratio，CR)，若對比越大則表示其識別度 越佳，而對比度的定義如下式（1)所示：I · 1 II 1 «IH 9 ϋ« I ϋ ϋ ϋ I ϋ β ϋ ^ 1 · 1 n 1 · 1 nn ϋ ϋ ϋ I ϋ ϋ nnnnnnn ϋ I 578436 09473twf.doc / 006 _ B7 V. Description of the invention (B ) (Please read the precautions on the back before filling out this page) Contains multi-layer films such as hole injection layer, hole transport layer, organic electroluminescent layer, electron transport layer, and electron injection layer; and the material of metal cathode 106 It is usually an inscription, an inscription, or a magnesium-silver alloy. For any display element, the brightness ratio 全 between full light and full darkness is a major factor that determines its recognition. This brightness ratio 値 is generally called the Contrast Ratio (CR). If the contrast is larger, it means The better its recognition, and the definition of contrast is shown in the following formula (1):
Cr = L 喊 υ" + Ramh ^ sub,Off + Ramfy__________(1) 其中’ Lsub ()n爲畫素（pixel)被點売時的亮度，Lsub()ff爲 畫素未被點亮時的亮度，而Ramb爲外界光線進入顯示元件 內被反射出的亮度，假設畫素被點亮時的亮度爲10〇，而 未被點亮時亮度爲1，則根據式（1)可計算出外界光線進入 顯示元件內被反射出的亮度與顯示元件的對比度之間的關 係。 經濟部智慧財產局員工消費合作社印製 弟2圖即繪不習知有機電激發光二極體顯示元件中對 比度與外界亮度之間的關係圖。由第2圖中可明顯的看出， 當外界光線從有機電激發光二極體顯示反射的量越多時， 其對比度會越小，亦即顯示元件的識別度會越差。然而， 對於習知有機電激發光二極體顯示元件而言，其在強外界 光線之下的識別效果似乎不盡理想，因此如何增加顯示元 件的對比度以獲得較佳的識別度是目前仍須進一步突破的 課題之一。 4 本紙張尺度適用中國國家標準（CNS)A4規恪（210 X 297公釐） 578436 09473twf.doc/006 A7 ---- B7 五、發明說明（> ) LUXELL公司製作出具有光干涉層（〇ptical Interference Layer)的有機電激發光二極體顯示元件，其主 要在有機電激發光二極體顯示元件中，有機發光層與金屬 陰極之間加入一厚度很薄的金屬半穿透層以及一透明材料 層’此透明材料層通常爲金屬氧化物，藉由上述結構的光 學破壞性干涉效應可將外界光線的反射率降至1%以下， 進而有效地提升顯示元件的對比度。 然而，有機電激發光二極體顯示元件中的有機官能 層部份是採用蒸鍍的方式形成，但在光干涉層中的透明材 料層（金屬氧化物）會使用濺鍍的方式進行鍍膜，因此， 上述方法最大的缺點如下： 1·必須不同機台進行有機發光層以及光干涉層的鍍 製。 2. 藉由不同機台進行鍍膜的結果會產生膜層彼此之間 應力匹配的問題，進而導致良率下降、製程成本增加。 3. 光干涉層以濺鍍方式鍍製，由於濺鍍製程中離子轟 擊(Ion Bombardment)帶有很大的能量，此離子轟擊的能量 容易破壞已鍍製完成的有機發光層。 4. 由於光干涉層以濺鍍方式鍍製，但濺鍍設備（機台） 的投資較爲昂貴。 因此，本發明的目的在提出一種具有光吸收層之有 機電激發光二極體顯示元件’可大幅度降低外界光線從有 機電激發光二極體顯示元件中反射的量，以有效的提升在 強光下的對比度，進而增加顯示元件的識別效果。 5 本纸張尺度適用中國國家標準（CNS)A4規恪（210x 297公笼） f請先閱讀背面之注意ί項再填寫本頁} 言· 經濟部智慧財產局員工消費合作社印製 ^_I 經濟部智慧財產局員工消費合作社印製 578436 〇9473twf.d〇c/〇〇6 A7 ________ B7 發明說明（q：) $發明的另一目的在提出一種具有光吸收層之有機 電^敷胃光二極體顯示元件，其中的光吸收層係採用蒸鍍的 行製作，與有機發光層的鍍膜製程相容，製程較爲 胃胃’ s不會有濺鍍製程造成有機發光層被破壞的問題。 明的再一目的在提出一種具有光吸收層之有機 胃丨敷#光二極體顯示元件，其中的光吸收層係爲一般有機 電:¾¾光:二極體皆會使用之材質，因此不需要額外增加其 他的蒸鍍材料與設備。 爲達本發明之上述目的，提出一種有機電激發光二 極體顯示元件主要係由一透明基板、多個陽極、一有機官 能層'一光吸收層以及多個陰極所構成。其中，陽極係配 置於透明基板上。有機官能層係配置於透明基板上並覆蓋 住陽極’光吸收層係配置於有機官能層上，而陰極則配置 於光吸收層上。藉由光吸收層以改善外界光線的反射現 象’進一步增加顯示元件的對比度。 本發明中，陽極與陰極例如爲條狀之結構，且陽極 的延伸方向係垂直於陰極的延伸方向。光吸收層係由一有 機材質層與一半穿透層所構成，有機材質層之例如爲具有 電子傳導能力之有機化合物（Organic Compounds)或是有機 金屬化合物（Organometallic Compounds)，其材質例如爲 CuPc (Copper phthalocyanine)，而半穿透層例如係以厚度 較薄之金屬構成，其材質例如爲鋁金屬(Alumirmm)。 本發明中，有機官能層例如係由一電洞注入層、一 電洞傳輸層、一有機電激發光層、一電子傳輸層以及一電 6 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐) -------丨丨丨丨丨i丨丨丨丨丨訂·丨丨丨丨丨丨丨線 (請先閱讀背面之注意事項再填寫本頁) 578436 09473twf.doc/006 A7 B7 經濟部智慧財產局員工消費合作社印製 五、發明說明（f ) 子注入層所構成。 爲讓本發明之上述目的、特徵、和優點能更明顯易 懂，下文特舉一較佳實施例，並配合所附圖式，作詳細說 明如下： 圖式之簡單說明： 第1圖繪示爲習知有機電激發光二極體顯示元件之 剖面示意圖； 第2圖繪示爲習知有機電激發光二極體顯示元件中 對比度與外界亮度之間的關係圖； 第3圖繪示爲有機電激發光二極體顯示元件中外界 光線反射的示意圖； 第4圖繪示爲依照本發明一較佳實施例有機電激發 光二極體顯示元件之剖面示意圖； 第5圖繪示爲有機電激發光二極體顯示元件中對比 度與外界亮度之間的關係圖；以及 第6圖繪示爲依照本發明一較佳實施例有機電激發 光二極體顯示元件之製作流程圖。 圖式之標示說明： 100、200、300 :透明基板 102、202、302 :透明陽極 104、204、304 :有機官能層 106、206、308 :金屬陰極 306 :光吸收層 306a :有機材質層 7 (請先閱讀背面之注意事項再填寫本頁) - 訂---------線' 本紙張尺度適用中國國家標準（CNS)A4規恪（210x 297公釐〉 578436 A7 B7 〇9473twf.doc/006 五、發明說明（ί) 306b :半穿透層 S400 :提供透明基材 S402 :形成透明陽極 S404 :蒸鍍有機官能層 S406 :蒸鍍光吸收層 S408 :形成陰極 W,、W2、W3 :反射光線 h、L2、L3 :光線 較佳實施例 第3圖繪示爲有機電激發光二極體顯示元件中外界 光線反射的示意圖。請參照第3圖’有機電激發光二極體 顯示元件主要係由一透明基板200、多個條狀之透明陽極 202、一有機官能層204以及多個條狀之金屬陰極206所 組成。其中，有機官能層2〇4的折射率n!和透明陽極202 的折射率n2非常接近，而有機官能層204的折射率a例 如大於透明基板200的折射率n3，其中Πι約爲1.7左右， n2約介於1.8至2.0之間，而n3約爲1.5左右，且n3大於 外界空氣的折射率(《1)。 有機電激發光顯示元件中的光線係由有機官能層204 所產生，所產生光線的行進方向雖爲任意方向，但金屬陰 極2〇6可視爲一反射層，因此光線僅能朝透明基板200方 向傳出。 朝透明基板200方向傳出的光線通常會受到外界光 線的影響，而使其辨識度不如預期。其中，外界光線進入 8 本紙張尺度適用中國國家標準（CNS)A4規丨各（210 X 297公餐） --II — — — - — — I — — — — — — — I— ^ ·11111111 (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印裂 578436 09473 twf. doc/006 A7 B7 五、潑明說明（、7 ) 有機電激發光顯示元件時，主要會在空氣與透明基板200 的介面、透明基板200與透明陽極202的界面以及有機官 能層204與金屬陰極206的界面產生反射，再朝透明基板 200方向傳出。 空氣與透明基板200介面的反射光線Wi約佔4%， 透明基板200與透明陽極202介面的反射光線W2約佔 0.8%，而有機官能層204與金屬陰極206介面的反射光線 W3則超過90%。由此可知，大部份的反射光線是由金屬 陰極206的反射而產生的。換言之，有機官能層204與金 屬陰極206之間的界面是反射光線的主要來源。 第4圖繪示爲依照本發明一較佳實施例有機電激發 光二極體顯示元件之剖面示意圖。請參照第4圖，本發明 之有機電激發光二極體顯示元件主要係由一透明基板 300、多個條狀之透明陽極302、一有機官能層304、光吸 收層306以及多個條狀之金屬陰極308所組成。其中，透 明基板300通常使用玻璃基板；透明陽極302之材質通常 爲氧化銦錫等透明導電材質；有機官能層304通常爲多層 有機薄膜，其（有機官能層304)通常包含有電洞注入層、 電洞傳輸層、有機電激發光層、電子傳輸層以及電子注入 層等多層薄膜；而金屬陰極308之材質通常是鋁、鈣或鎂 -銀合金等。 光吸收層306係由一有機材質層306a與一半穿透層 306b所構成。其中，有機材質層306a之例如爲具有電子 傳導能力之有機化合物(Organic Compounds)或是有機金屬 9 (請先閱讀背面之注意事項再填寫本頁) --------訂---------線. 經濟部智慧財產局員工消費合作社印製 本紙張尺度適用中國國家標準（CNS)yVl規烙（210x297公釐） 578436 09473twf.doc/006 A7 B7 經濟部智慧財產局員工消費合作社印製 五、發明說明（<?) 化合物（Organometallic Compounds)，而半穿透層 306b 例 如係以厚度較薄之金屬構成。此外，有機材質層306a之 材質例如爲CuPc (Copper phthalocyanine)，而半穿透層 306b之材質例如爲銘金屬（Aluminum)。由上述有機材質層 306a與半穿透層306b所構成光吸收層306具有光學干涉 的效果，其藉由光學破壞性干涉效應可使得外界光線的反 射率下降，進而有效地提升顯示元件的對比度。 換言之，外界光線入射至半穿透層306b與有機官能 層304之界面時，會有部份光線L,被反射，而部份光線 穿透的現象。穿透半穿透層306b之光線會被陰極308反 射而折回，而被陰極308反射而折回的光線同樣會有部份 光線L2穿透，而部份光線反射的現象。此外，半穿透層306b 與金屬陰極308之間可能會發生多次反射後才由元件出 射，如光線L3。本實施例中，藉由調整有機材質層306a 的厚度，使得光線Im、光線L2、光線L3彼此間的光程差 滿足破壞性干涉的條件，進而讓反射光線的強度降到最 低，達到提高對比的目的。 第5圖繪示爲有機電激發光二極體顯示元件中對比 度與外界亮度之間的關係圖。請參照第5圖，由圖中可以 輕易得知，本發明具有光吸收層之有機電激發光二極體顯 示元件，其在對比度的表現上會優於傳統有機電激發光二 極體顯示元件。 第6圖繪示爲依照本發明一較佳實施例有機電激發 光二極體顯示元件之製作流程圖。請參照第6圖，本發明 (請先閱讀背面之注意事項再填寫本頁) mm§ I mm— mB§ mmmmw · ϋ I ί ϋ 線· 本纸張尺度適用中國國家標準（CNS)A4規烙（210x297公:g ) 578436 A7 B7 09473twf.doc/006 五、發明說明（]) 有機電激發光二極體顯示元件之製作主要包含下列步驟： 提供透明基材S400、形成透明陽極S402、蒸鍍有機官能 層S404、蒸鍍光吸收層S406以及形成陰極S408。 本發明在蒸鍍有機官能層S404之後，仍繼續使用蒸 鍍設備進行蒸鍍光吸收層S406的動作。其中，光吸收層306 中的有機材質層306a與半穿透層306b所採用的材質皆爲 有機電激發光二極體皆會使用之材質，因此不需要額外增 加其他的蒸鍍材料與設備。 綜上所述，本發明之有機電激發光二極體顯示元件 至少具有下列優點： 1·本發明之有機電激發光二極體顯示元件可大幅度降 低外界光線從有機電激發光二極體顯示元件中反射的量， 以有效的提升在強光下的對比度，進而增加顯示元件的識 別效果。 2·本發明之有機電激發光二極體顯示元件中，光吸收 層係採用蒸鍍的方式進行製作，其與有機發光層的鍍膜製 程相容，且製程較爲簡單。 3·本發明之有機電激發光二極體顯示元件中，光吸收 層係採用蒸鍍的方式進行製作，不會有濺鍍製程造成有機 發光層被破壞的問題。 雖然本發明已以一較佳實施例揭露如上，然其並非 用以限定本發明，任何熟習此技藝者，在不脫離本發明之 精神和範圍內，當可作各種之更動與潤飾，因此本發明之 保護範圍當視後附之申請專利範圍所界定者爲準。 11 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公餐) · _ — (請先閲讀背面之注意事項再填寫本頁} ;#------- —訂---------線· 經濟部智慧財產局員工消費合作社印製Cr = L shout + Ramh ^ sub, Off + Ramfy __________ (1) where 'Lsub () n is the brightness when the pixel is clicked, and Lsub () ff is the brightness when the pixel is not lit , And Ramb is the brightness reflected by the external light entering the display element. Assuming that the brightness of the pixel is 10 and the brightness is 1 when it is not lit, the external light can be calculated according to formula (1). The relationship between the brightness reflected into the display element and the contrast of the display element. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, the second picture is the relationship between the contrast in the organic electroluminescent diode display element and the external brightness. It can be clearly seen from FIG. 2 that when the external light is reflected from the organic electroluminescent diode more, the contrast will be smaller, that is, the recognition degree of the display element will be worse. However, for a conventional organic electroluminescent diode display element, its recognition effect under strong external light does not seem to be satisfactory. Therefore, how to increase the contrast of the display element to obtain a better recognition degree still needs to be further improved. One of the breakthrough topics. 4 This paper size applies the Chinese National Standard (CNS) A4 (210 X 297 mm) 578436 09473twf.doc / 006 A7 ---- B7 V. Description of the invention (>) LUXELL has produced a light interference layer ( 〇ptical Interference Layer) organic electroluminescent diode display element, which is mainly in the organic electroluminescent diode display element, a thin metal semi-transparent layer and a transparent layer are added between the organic light emitting layer and the metal cathode Material layer 'This transparent material layer is usually a metal oxide. The optical destructive interference effect of the above structure can reduce the reflectance of external light to less than 1%, thereby effectively improving the contrast of the display element. However, the organic functional layer part of the organic electroluminescent diode display element is formed by evaporation, but the transparent material layer (metal oxide) in the light interference layer is coated by sputtering, so The biggest disadvantages of the above method are as follows: 1. The organic light emitting layer and the light interference layer must be plated on different machines. 2. As a result of coating by different machines, the problem of stress matching between the film layers will occur, which will lead to a decrease in yield and an increase in process costs. 3. The light interference layer is plated by sputtering. Because the ion bombardment (Ion Bombardment) in the sputtering process has a large amount of energy, the energy of this ion bombardment can easily destroy the organic light-emitting layer that has been plated. 4. Because the light interference layer is plated by sputtering, the investment in sputtering equipment (machine) is more expensive. Therefore, the object of the present invention is to propose an organic electroluminescent diode display element with a light absorbing layer, which can greatly reduce the amount of external light reflected from the organic electroluminescent diode display element, so as to effectively enhance the strong light Lower contrast, which in turn increases the recognition effect of the display element. 5 This paper size applies the Chinese National Standard (CNS) A4 (210x 297 male cage) f Please read the note on the back before filling this page} Words · Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economy ^ _I Economy Printed by the Consumer Cooperatives of the Ministry of Intellectual Property Bureau 578436 〇9473twf.d〇c / 〇〇6 A7 ________ B7 Description of Invention (q :) $ Another purpose of the invention is to propose an organic electric device with a light-absorbing layer The light-absorbing layer is made of a vapor-deposited line, which is compatible with the coating process of the organic light-emitting layer. The manufacturing process is relatively stomach-and-gas's. There is no problem that the organic light-emitting layer is damaged by the sputtering process. Another purpose of Ming is to propose an organic stomach with a light absorbing layer. #Light diode display elements, where the light absorbing layer is a general organic electricity: ¾ ¾ light: materials are used for diodes, so no need Additional additional evaporation materials and equipment. In order to achieve the above object of the present invention, an organic electroluminescent diode display element is proposed, which is mainly composed of a transparent substrate, a plurality of anodes, an organic functional layer, a light absorbing layer, and a plurality of cathodes. Among them, the anode system is disposed on a transparent substrate. The organic functional layer is disposed on the transparent substrate and covers the anode. The light absorbing layer is disposed on the organic functional layer, and the cathode is disposed on the light absorbing layer. The use of a light absorbing layer to improve the reflection of external light 'further increases the contrast of the display element. In the present invention, the anode and the cathode are, for example, strip-shaped structures, and the extension direction of the anode is perpendicular to the extension direction of the cathode. The light absorbing layer is composed of an organic material layer and a semi-transmissive layer. The organic material layer is, for example, organic compounds or organic metal compounds with electronic conductivity, and the material is, for example, CuPc ( Copper phthalocyanine), and the semi-transmissive layer is made of, for example, a thin metal, and the material is, for example, aluminum metal (Alumirmm). In the present invention, the organic functional layer is composed of, for example, a hole injection layer, a hole transport layer, an organic electro-excitation light layer, an electron transport layer, and an electrical layer. The paper size is applicable to the Chinese National Standard (CNS) A4 specification ( 210 X 297 mm) ------- 丨 丨 丨 丨 丨 丨 丨 丨 丨 Booking 丨 丨 丨 丨 丨 丨 丨 Line (Please read the precautions on the back before filling this page) 578436 09473twf. doc / 006 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs V. Invention Description (f) Sub-injection layer. In order to make the above-mentioned objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is given below in conjunction with the accompanying drawings for detailed description as follows: Brief description of the drawings: FIG. 1 shows Is a schematic cross-sectional view of a conventional organic electroluminescent diode display element; FIG. 2 is a diagram illustrating a relationship between contrast and external brightness in a conventional organic electroluminescent diode display element; FIG. 3 is an organic electroluminescent diode Schematic diagram of external light reflection in an excitation light diode display element; FIG. 4 is a schematic cross-sectional view of an organic electrical excitation light diode display element according to a preferred embodiment of the present invention; FIG. 5 is an organic electrical excitation light diode display FIG. 6 is a diagram showing the relationship between the contrast and the external brightness in a volume display element; and FIG. 6 is a flowchart illustrating a method for fabricating an organic electroluminescent diode display element according to a preferred embodiment of the present invention. Description of the drawings: 100, 200, 300: transparent substrates 102, 202, 302: transparent anodes 104, 204, 304: organic functional layers 106, 206, 308: metal cathodes 306: light absorption layers 306a: organic material layers 7 (Please read the precautions on the back before filling out this page)-Order --------- Line 'This paper size applies Chinese National Standard (CNS) A4 (210x 297 mm> 578436 A7 B7 〇9473twf .doc / 006 V. Description of the invention (ί) 306b: Semi-transmissive layer S400: Provide transparent substrate S402: Form transparent anode S404: Evaporate organic functional layer S406: Evaporate light absorbing layer S408: Form cathode W ,, W2 , W3: reflected light h, L2, L3: preferred embodiment of light Figure 3 shows a schematic diagram of external light reflection in an organic electroluminescent diode display element. Please refer to Fig. 3 'Organic electroluminescent diode display The device is mainly composed of a transparent substrate 200, a plurality of strip-shaped transparent anodes 202, an organic functional layer 204, and a plurality of strip-shaped metal cathodes 206. Among them, the refractive index n! Of the organic functional layer 204 and the transparency The refractive index n2 of the anode 202 is very close, while that of the organic functional layer 204 The emissivity a is, for example, larger than the refractive index n3 of the transparent substrate 200, where Πm is about 1.7, n2 is about 1.8 to 2.0, and n3 is about 1.5, and n3 is greater than the refractive index of the outside air (<1). The light in the organic electroluminescent display element is generated by the organic functional layer 204. Although the traveling direction of the generated light is arbitrary, the metal cathode 206 can be regarded as a reflective layer, so the light can only be directed to the transparent substrate 200. Outgoing. The light coming out of the transparent substrate 200 is usually affected by external light, making it less recognizable. Among them, the external light entering 8 paper standards is applicable to Chinese National Standard (CNS) A4 regulations 丨 each (210 X 297 Public Meal) --II — — — — — — I — — — — — — I — ^ 11111111 (Please read the precautions on the back before filling this page) The Intellectual Property Bureau of the Ministry of Economic Affairs ’s Consumer Cooperatives printed 578436 09473 twf. Doc / 006 A7 B7 V. Introduce (、 7) When organic electro-excitation light display elements are used, the interface between air and transparent substrate 200 and the interface between transparent substrate 200 and transparent anode 202 The interface between the organic functional layer 204 and the metal cathode 206 is reflected, and then it is transmitted toward the transparent substrate 200. The reflected light Wi at the interface between the air and the transparent substrate 200 accounts for about 4%, and the reflected light W2 at the interface between the transparent substrate 200 and the transparent anode 202 is about It accounts for 0.8%, and the reflected light W3 at the interface between the organic functional layer 204 and the metal cathode 206 exceeds 90%. It can be seen that most of the reflected light is generated by the reflection of the metal cathode 206. In other words, the interface between the organic functional layer 204 and the metal cathode 206 is the main source of reflected light. FIG. 4 is a schematic cross-sectional view of an organic electroluminescent diode display device according to a preferred embodiment of the present invention. Please refer to FIG. 4. The organic electroluminescent diode display element of the present invention is mainly composed of a transparent substrate 300, a plurality of strip-shaped transparent anodes 302, an organic functional layer 304, a light absorption layer 306, and a plurality of strip-shaped Composed of metal cathode 308. Among them, the transparent substrate 300 is usually a glass substrate; the material of the transparent anode 302 is usually a transparent conductive material such as indium tin oxide; the organic functional layer 304 is usually a multilayer organic thin film, and the (organic functional layer 304) generally includes a hole injection layer, Multilayer films such as a hole transport layer, an organic electro-optic layer, an electron transport layer, and an electron injection layer; and the material of the metal cathode 308 is usually aluminum, calcium, or a magnesium-silver alloy. The light absorbing layer 306 is composed of an organic material layer 306a and a semi-transmissive layer 306b. Among them, the organic material layer 306a is, for example, organic compounds having electronic conductivity (Organic Compounds) or organic metal 9 (please read the precautions on the back before filling this page) -------- Order --- ------ line. Printed by the Consumers' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. The paper size is applicable to the Chinese National Standard (CNS) yVl (210x297 mm) 578436 09473twf.doc / 006 A7 B7 Employees of the Intellectual Property Bureau of the Ministry of Economic Affairs The Consumer Cooperative printed 5. Invention Organometallic Compounds, and the semi-transmissive layer 306b was made of a thinner metal, for example. The material of the organic material layer 306a is, for example, CuPc (Copper phthalocyanine), and the material of the semi-transmissive layer 306b is, for example, aluminum. The light absorbing layer 306 composed of the organic material layer 306a and the semi-transmissive layer 306b has the effect of optical interference. The optical destructive interference effect can reduce the reflectance of external light, thereby effectively improving the contrast of the display element. In other words, when the external light is incident on the interface between the semi-transmissive layer 306b and the organic functional layer 304, a part of the light L may be reflected and a part of the light may penetrate. The light penetrating the semi-transmissive layer 306b will be reflected by the cathode 308 and turned back, and the light reflected by the cathode 308 and turned back will also partially penetrate the light L2 and partially reflect. In addition, there may be multiple reflections between the semi-transmissive layer 306b and the metal cathode 308 before being emitted by the element, such as light L3. In this embodiment, by adjusting the thickness of the organic material layer 306a, the optical path difference between the light Im, the light L2, and the light L3 satisfies the condition of destructive interference, thereby reducing the intensity of the reflected light to a minimum and improving the contrast. the goal of. Fig. 5 is a graph showing the relationship between the contrast ratio and the external brightness in an organic electroluminescent diode display element. Please refer to FIG. 5. It can be easily understood from the figure that the organic electroluminescent diode display element having a light absorbing layer according to the present invention has better contrast performance than the conventional organic electroluminescent diode display element. FIG. 6 is a flowchart illustrating a method for fabricating an organic electroluminescent diode display device according to a preferred embodiment of the present invention. Please refer to Figure 6, the present invention (please read the precautions on the back before filling out this page) mm§ I mm— mB§ mmmmw · ϋ I ί ϋ line · This paper size applies Chinese National Standard (CNS) A4 regulations (210x297 male: g) 578436 A7 B7 09473twf.doc / 006 V. Description of the invention (]) The production of organic electroluminescent diode display elements mainly includes the following steps: Provide a transparent substrate S400, form a transparent anode S402, and evaporate organic The functional layer S404, the vapor-absorbing light absorbing layer S406, and the cathode S408 are formed. In the present invention, after the organic functional layer S404 is vapor-deposited, the operation of vapor-depositing the light-absorbing layer S406 is continued using vapor deposition equipment. Among them, the organic material layer 306a and the semi-transmissive layer 306b in the light absorbing layer 306 are all materials used by organic electro-luminescent diodes, so there is no need to add other evaporation materials and equipment. In summary, the organic electroluminescent diode display element of the present invention has at least the following advantages: 1. The organic electroluminescent diode display element of the present invention can greatly reduce external light from the organic electroluminescent diode display element The amount of reflection effectively improves the contrast under strong light, thereby increasing the recognition effect of the display element. 2. In the organic electroluminescent diode display device of the present invention, the light absorption layer is made by evaporation, which is compatible with the coating process of the organic light emitting layer, and the manufacturing process is relatively simple. 3. In the organic electroluminescent diode display device of the present invention, the light absorbing layer is produced by vapor deposition, and there is no problem that the organic light emitting layer is damaged due to the sputtering process. Although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make various changes and decorations without departing from the spirit and scope of the present invention. The scope of protection of the invention shall be determined by the scope of the attached patent application. 11 This paper size applies to China National Standard (CNS) A4 specifications (210 X 297 meals) · _ — (Please read the precautions on the back before filling this page}; # ------- —Order --- ------ Line Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs