1272865 (1) 玖、發明說明 【發明所屬之技術領域】 本發明係有關一種具有局精細、可靠性優、攜帶刑終 麵機和產業用5十測益之顯不等能廣大應用範圍的有機電激 發光顯示器。 【先前技術】1272865 (1) 玖, invention description [Technical field to which the invention belongs] The present invention relates to a wide range of applications with fineness, reliability, portability, and industrial use. Electromechanical excitation light display. [Prior Art]
近年開發使用薄膜電晶體（TFT)之驅動方式的彩色有 機電激發光顯示器。光取出至形成TFT的基板側的方式 乃利用配線部分的光之遮光效果，爲了不提高開口率，最 近則是將光取出至與形成TFT之基板相反的這一側，開 發出所謂的頂部發射方式。In recent years, a color electromechanical excitation light display using a thin film transistor (TFT) driving method has been developed. The manner in which the light is taken out to the side of the substrate on which the TFT is formed is the light-shielding effect of the light in the wiring portion. In order not to increase the aperture ratio, the light is recently taken out to the side opposite to the substrate on which the TFT is formed, and a so-called top emission is developed. the way.
一方面，於圖案化之螢光體吸收有機電激發光元件的 發光，進一步開發出由各個螢光體發出多色螢光的色彩變 換方式。該方式是藉著兼作TFT驅動使用的頂部發射方 式，進而包括能提供高精細、高亮度之有機電激發光顯示 器的可能性。揭示於日本特開平第1 1 — 2 5 1 05 9號公報、 特開平第2000 - 77 1 9 1號公報的彩色顯示裝置係爲此種方 式之一例。 【發明內容】 [發明欲解決之課題] 使用色彩變換方式的頂部發射顯示器之構造係有機電 激發光元件和色彩變換濾光片（色彩變換層單體或彩色濾 -4- (2) 1272865* 光片層與色彩變換層的積層體）是藉由配設在其間的柱狀 間隙調整層，面對有機電激發光元件之上部側的透明電極 ，具有一定間隙而配設的構造，揭示於日本特開平第11 —2974 7 7號公報中。並於該間隙塡充絕緣油等的構造乃 揭示於日本實開平第3 - 923 98號公報中。 但是藉由柱狀構造物（支柱）設有一定間隙的構成，在 有機電激發光層與色彩變換濾光片之間存在折射率大不相 同的氣體層（空隙），在氣體層與有機電激發光元件的界面 ，或是氣體層與色彩變換濾光片的界面的光之反射變大， 光的取出效率降低。而在間隙注入絕緣油等的構成，雖然 可緩和相關的反射問題，但顯示器之製造製程複雜化方面 ，會損及到原本完全固體裝置的有機電激發光顯示器之優 點的耐衝撃性，就稱不上是最佳的構成。 解決該些問題的構成係藉由透明樹脂層互相強固貼合 有機電激發光元件和面對該有機電激發光元件之上部的透 明電極的色彩變換濾光片的構成亦揭示於日本特許第 2766095號中。但於該構造中，接著有機電激發光元件與 色彩變換濾光片的工程’或是放置所形成的顯示器的環境 溫度變化等所產生的熱應力和振動、壓力等的機械性應力 ，而使電激發光元件受到剝離等損傷的問題。 更於曰本特開平第11— 121164號公報中揭示，於有 機電激發光元件與色彩變換濾光片之間，以結合層作爲色 彩變換濾光片側而積層屬於樹脂薄膜的基底薄膜、和同樣 屬於樹脂薄膜的結合層的構成。但於諸公報中記載當作結 -5· (3) 1272865 合層的作用，而平坦化色彩變換濾光片的段差，和作爲色 彩變換濾光片與基底薄膜的緩衝膜的功能。然而該公報並 未針對色彩變換濾光片與有機電激發光元件的間隙調整做 考量。而是只當作與基底薄膜的緩衝膜之功能，對於緩和 加諸在重要的有機電激發光元件的應力亦無啓發性。更如 本發明欲針對具備有TFT的有機電激發光顯示器解決固 有的問題，因爲該公報的發明本身並不具備TFT故未談 及。 [用以解決課題之手段] 若按照本發明，爲達成上述目的， 在基板上具備有：由源極及汲極所形成的薄膜電晶體 、和積層形成在該薄膜電晶體的上部由連接在前述源極或 汲極的導電性薄膜材料所形成的第一電極、至少由有機電 激發光層、透明導電性薄膜材料所形成的上部透明電極的 第二電極、至少一層以上鈍化層，利用前述薄膜電晶體驅 動的有機電激發光元件，形成在透明支持基板上的色彩變 換層單體或彩色濾光片層和色彩變換層的積層體是面對前 述有機電激發光元件的第二電極側而配置的有機電激發光 顯示器中， 其在色彩變換層單體或彩色濾光片層和色彩變換層的 積層體之前述第二電極側，積層而設有楊氏率相異之至少 兩種的被覆層，使該被覆層中的前述第二電極側的被覆層 密著於前述鈍化層的表面，同時密封接著前述基板與支持 -6- (4) 1272865 基板之外周所形成。尙且，使用彩色濾光片層與色彩變換 層的積層體的情形下，例如由有機電激發光元件發光的光 爲藍色的時候，對藍色而言，僅爲彩色濾光片層，對綠色 與紅色而言，爲彩色濾光片層與色彩變換層的積層體。 就本發明來看，楊氏率相異的至少兩種被覆層中，楊 氏率最小的被覆層，以在有機電激發光元件的顯示區域內 密著於前述鈍化層的表面所形成的爲佳。 像這樣，本發明係爲形成TFT的基板和至少形成屬 於色彩變換層的支持基板的透明基板，在兩者基板間於透 明基板側沒有空間的面對間隙調整用的被覆層，於基板側 (有機電激發光元件側）沒有空間的面對應力緩和用的被覆 層，特別是藉由楊氏率小的應力緩和用的被覆層，在與鈍 化層的界面，顯示性能不會受到不良影響，就能避免產生 氣體的空隙。亦即，楊氏率最小的被覆層是在顯示區域內 密著於鈍化層，埋設因TFT配線所引起的凹凸而產生的 空間’且針對有機電激發光顯示器緩和由環境所施加的熱 應力和機械性應力。因TFT基板之配線引起的凹凸爲1〜 2μιη左右，埋設該凹凸的楊氏率最小之被覆層的厚度以2 〜4μηι最適合。 【實施方式】 [發明的實施形態] 針對本發明之有機電激發光顯示器於以下做說明。 以下說明中，說明第一電極爲陽極、第二電極爲陰極 (6) 1272865 明（透過率約爲50%以上），介著該陰極而發光。尙且，在 本詳細說明書中稱爲有機電激發光層的情形，亦包括正電 洞注入層、正電洞傳遞層、電子注入層的情形。 透明的陰極是以鋰、鈉等的鹼金屬、鉀、鈣、鎂、緦 等的鹼土類金屬，或是由該些氟化物等所形成的電子注入 性的金屬、與其他金屬的合金和化合物的極薄膜（1 Onm以 下）作爲電子注入層，在其上形成ITO或是IZO等的透明 導電膜的構成。 有機電激發光層的各層材料係使用公開已知者。例如 有機電激發光層欲由監色得到監綠色的發光，例如最好使 用苯并噻唑系、苯并咪唑系、苯并噁唑系等的螢光增白劑 、金屬螯合化氧鎗化合物、苯乙烯基苯系化合物、芳香族 二次甲基系化合物等。 3 :鈍化層 有機電激發光元件上的鈍化層，使用具有電氣絕緣性 ’且相對於水份、低分子成份具有遮蔽性，可視區域之透 明性高（在 400〜700nm的範圍，透過率 50%以上），最好 具有2H以上之膜硬度的材料。 例如可使用 SiOx，SiNx，SiNxOy，AlOx，TiOx， TaOx ’ ZnOx等的無機氧化物、無機氮化物等。該鈍化層 的形成方法只要不會讓有機電激發光元件受到不良影響， 就沒有特別限制，可用濺鍍法、CVD法、真空蒸鍍法等 形成。只要對元件沒有直接影響，也可用浸塗法等慣用的 手法形成。 -9- (7) 1272865 上述的鈍化層也可爲單層，但複數的層是積層’水份 遮蔽等其效果更大。 積層的鈍化層厚度以〇 · 1〜5 μιη爲佳。 4 :被覆層 被覆層也可形成在有機電激發光元件側’但有機電激 發光元件係利用對熱、紫外光較弱的材料所構成的緣故’ 對其上面形成的時候會發生各種限制。因而形成在對熱、 紫外光較強的色彩變換層上面會更理想。 鈍化層側最外的被覆層能不損及色彩變換層之功能的 形成在色彩變換層的上部，且具有高彈性者爲佳，可視區 域之透明性高（在400〜700nm的範圍，透過率50%以上） 、Tgl00°C以上、表面硬度以鉛筆硬度爲2H以上，在色 彩變換層上平滑的形成塗膜，只要是不會令色彩變換層的 功能降低的材料即可，例如舉例有：醯亞胺變性矽樹脂（ 參考日本特開平第5 一 134112號公報等）、無機金屬化合 物（TiO，Abo;，Si〇2等）分散於丙嫌基、聚醯亞胺、矽樹 脂等中者（參考日本特開平第5 — 119306號公報等）、紫外 線硬化型樹脂爲具有環氧變性丙烯酸酯樹脂（參考日本特 開平第7 - 48424號公報）、丙烯酸酯單體和低聚物與聚合 物的混合物的反應性乙烯基之樹脂、光阻劑樹脂（參考曰 本特開平第6 — 3 009 1 0號公報、特開平9_33 〇793號公報 等）、無機化合物的溶膠、凝膠法（參考日本月刊顯示器 1997年3卷7號等）、氟系樹脂（參考日本特開平第5 — 3 64 7 5號公報等）等的光硬化型樹脂及/或熱硬化型樹脂 -10- (8) 1272865 。楊氏率以0.3 MPa以上爲佳。該被覆層是爲 目所述的間隙保持在一定的設計，楊氏率爲〇 的話，間隙會因外部應力而不能保持在一定。 鈍化層最外側的被覆層例如舉例有：像是 、尼龍6 — 6的聚醯胺樹脂，在單位構造中不 高分子材料、矽膠、凝膠、各種合成橡膠等。 以楊氏率0.3 MPa以下的材料爲佳，更好是0 的材料。但O.OIMPa以下，因在層之形成時無 ，所以須爲0.01 MPa以上的材料。 連光阻劑也當作原料，不含剛直基的直鏈 含有功能基數3以下的單體，硬化物之3次元 會太高就能使用。或是連上述以外的光阻劑， 射或加熱量減弱，且在交聯密度不會太高的狀 當作應力緩和層就很適用。 5 :色彩變換濾光片（色彩變換層中彩色濾i 1)有機螢光染料 於本發明中，用於色彩變換層中的有機螢 吸收從發光體發出之藍色至藍綠色區域的光， 域之螢光的螢光染料例如舉例有：鹼性蕊香紅 香紅3 B、鹼性蕊香紅1 〇 1、鹼性蕊香紅1 1 〇、 紅、鹼性紫色Π、鹼性紅色2等的鹼性蕊香 深藍系染料、1—乙基一 2 — [4 —（p—二甲胺基 )一 1 3 — 丁二烯]一吡啶鑰全氯乙烯（吡啶1)等 料，或是噁嗪系染料等。進而各種染料（直接 了將課題項 • 3MPa以下 先用尼龍6 含剛直基的 具體而言， • 1 Μ P a以下* 法保持形狀 狀低聚物和 交聯密度不 只要是光照 態下使用， 长片） 光染料係爲 發出紅色區 B、鹼性蕊 硫鹼性蕊香 紅系染料、 苯基三羥基 的吡啶系染 染料、酸性 -11 - (9) 1272865 染料、鹼性染料、分散染料等）亦只 〇 吸收從發光體發出之藍色至藍綠 發出綠色區域之螢光的螢光染料舉例 唑基）—7-二乙胺基香豆素（香豆素 ，或是屬於香豆素系染料系染料的_ 色溶劑1 1、黃色溶劑1 1 6等的萘二 進而各種染料（直接染料、酸性染料 料等）亦只要有螢光性就可使用。 2) 黑色遮罩樹脂 其次，用於本發明之色彩變換濾 光硬化性或光熱倂用型硬化性樹脂進 使其產生基種、離子種而予聚合或交 的樹脂。 3) 彩色濾光片層 只有色彩變換層無法得到充分的 濾光片層與上述色彩變換層的積層體 度以1〜1·5μηι爲佳。 實施例 以下參照第1圖說明本發明的一 發明實施例之有機電激發光顯示器的 是本發明的比較例。 [TF丁基板 1 ， 2 ， 3] 要有螢光性就可使用 色區域的光，而當作 丨有：3 -（2’ 一苯并噻 6)等的香豆素系染料 含性黃色5 1，甚至黃 甲醯亞胺系染料等。 、鹼性染料、分散染 光片的基體樹脂是將 行光及/或熱處理， 聯之不溶解、不融化 色純度時，形成彩色 。彩色濾光片層的厚 實施例。第1圖是本 斷面槪略圖。第2圖 -12- (10) 1272865 如第1圖所示，在玻璃基板1形成底部閘極型的TFT ，且在陽極3連接TFT之源極的構成。 陽極3是介著形成在圖未示的TFT上的絕緣膜之接 觸孔，於下部形成連接在源極的鋁，在其上部表面形成 IZO(InZnO) 〇 設鋁的目的是爲了反射來自發光層的發光，並自頂部 效率良好的放出光，同時減低電氣電阻。鋁膜的厚度爲 3 0 0nm。設有上部之IZO的目的是爲了提高工作函數，效 率良好的注入電洞。IZO的厚度爲200nm。 [有機電激發光層4] 利用陽極3 /正電洞注入層/正電洞傳遞層/有機電 激發光層/電子注入層/陰極5構成有機電激發光元件（ 有機電激發光層4是由該構成，除了兩電極以外的四層構 成）。 將形成陽極3的基板1安裝在電阻加熱蒸鍍裝置內， 且不破壞真空地依序成膜正電洞注入層、正電洞傳遞層、 有機電激發光層、電子注入層。於成膜之際，真空槽內壓 會減壓至1 X 1 (T4Pa。正電洞注入層是積層lOOnm的銅 菁（CuPc)。正電洞傳遞層是積層20nm的4，4 —雙（N-(l 一萘基）一 N —苯胺基）聯苯（α - NPD)。有機電激發光層是 積層30nm4，4—雙 （2，2’一二苯基乙烯基）聯苯（〇?乂8〇 。電子注入層是積層20nm的銘螯合（Alq)。 之後，用金屬遮罩，以不破壞真空地形成透明的陰極 -13- (11) 1272865 透明的陰極5係藉由利用共同蒸鍍法將電子注入所需 要之工作函數小的金屬Mg/ Ag成膜爲膜厚2nm，且在其 上利用濺鍍法將IZO膜成膜爲膜厚200nm所形成。 [鈍化層6] 鈍化層6是利用濺鍍法將SiONx膜堆積3 00nm。 [彩色濾光片層9] 在透明（玻璃）基板12上利用旋塗法塗佈藍色濾光片 材料（富士 HANTOEREKUTORONIKUSUKUNOROJI 製：彩 色嵌鑲CB— 700 1 )後，利用微縮法實施圖案化，且形成膜 厚ΙΟμιη的線條圖案。 以同樣的彩色濾光片材料系，將紅、綠的彩色濾光片 層（圖未示）利用旋塗法塗佈在上述透明基板12上後，利 用微縮法實施圖案化，且形成膜厚1.5 nm的線條圖案。 [色彩變換層10] 綠色螢光染料是將香豆素6(0.7重量部）溶解於溶劑的 乙酸乙二醇丁醚酯（PGMEA) 120重量部。加入光聚合性樹 脂的「V25gPA/ P5」100重量部（商品名、新日鐵化成工 業股份有限公司）使其溶解，得到塗佈液。將該塗佈溶液 用旋塗法塗佈在透明基板12上的綠色彩色濾光片上，且 利用微縮法實施圖案化，形成膜厚1 Ομιη的線條圖案。 紅色螢光染料是將香豆素6(0.6重量部）、鹼性蕊香紅 6G(0.3重量SB)、鹼性紫色11(0.3重量部）溶解於溶劑的 PGMEA。力□入光聚合性樹脂的V25gPA / P5之100重量部 使其溶解，得到塗佈液。將該塗佈溶液用旋塗法塗佈在透 -14- (12) 1272865 明基板1 2的紅色彩色濾光片上’且利用微縮法實施圖案 化，形成膜厚1 Ο μιη的線條圖案。 在各色的色彩變換層10之間形成黑色遮罩Π (厚度 10 μιη)。熱傳導率高的黑色遮罩是在色彩變換層壁面先利 用可形成格子狀圖案的遮罩的濺鍍法形成5 00nm氧化鉻 。其次，使用同樣的遮罩，利用濺鍍法將SiN膜，以同膜 厚的方式形成在R，G，B之子像素的周邊。像素的間距 爲0.3x0.3mm，各色的子像素形狀爲0.1x0.3mm。 [第一被覆層7 ] 在色彩變換層1〇的上面利用旋塗法塗佈ZPN1 10 0(日 本ΖΕΟΝ製）（楊氏率約5MPa)，然後用微縮法圖案化，形 成在色彩變換層10的上部。自色彩變換層10表面起的厚 度爲3 μιη。 [第二被覆層8] 將應力緩和用且覆蓋TFT配線之凹凸的矽凝膠（東麗 DAUKONINGU製）利用網版印刷法塗佈在第一被覆層7 之上（楊氏率約0.05 MPa)。網版印刷時爲4〜5μπι的厚度 ’但經由施加壓力而貼合的工程，則成爲約1 / 2的厚度 〇 矽凝膠的塗佈方法並不限於網版印刷法，儘可能滴下 需要量即可，而且也能使用可形成薄層的邊緣塗佈、條紋 塗佈的手法。 [貼合] 將在如此所得到的TFT2形成有機電激發光元件與鈍 -15- (13) 1272865 化層6的基板1、和形成彩色濾光片層9、色彩變換層1 Ο 、黑色遮罩11、第一被覆層7、第二被覆層8的透明基板 1 2，利用UV硬化型的密封樹脂1 3貼合。密封樹脂1 3可 使用像這樣的UV硬化型環氧樹脂或UV硬化型丙烯基樹 脂。On the other hand, in the case where the patterned phosphor absorbs the light emitted from the organic electroluminescence element, a color conversion method in which multicolor fluorescence is emitted from each of the phosphors is further developed. This method is based on the top emission mode which is also used as a TFT driver, and further includes the possibility of providing a high-definition, high-brightness organic electroluminescence display. A color display device disclosed in Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. 2000-77 119. SUMMARY OF THE INVENTION [Problems to be Solved by the Invention] The structure of a top emission display using a color conversion method is an organic electroluminescence element and a color conversion filter (color conversion layer unit or color filter -4- (2) 1272865* The laminated body of the light-transmissive layer and the color-converting layer is a structure in which a columnar gap adjusting layer disposed therebetween faces the transparent electrode on the upper side of the organic electroluminescence element, and has a certain gap, and is disclosed in Japanese Patent Laid-Open No. 11-2974 7-7. The structure in which the insulating oil or the like is filled in the gap is disclosed in Japanese Laid-Open Patent Publication No. 3-92398. However, since the columnar structure (pillar) is provided with a certain gap, a gas layer (gap) having a refractive index greatly different between the organic electroluminescence layer and the color conversion filter is present, and the gas layer and the organic electricity are present in the gas layer and the organic electricity. The interface of the excitation element or the reflection of light at the interface between the gas layer and the color conversion filter becomes large, and the light extraction efficiency is lowered. In the case where the insulating oil or the like is injected into the gap, the related reflection problem can be alleviated, but the manufacturing process of the display is complicated, and the impact resistance of the organic electroluminescent display of the completely solid device is impaired. Not the best composition. A configuration for solving such a problem is a configuration in which a color conversion filter in which a transparent resin layer is strongly bonded to an organic electroluminescence element and a transparent electrode facing an upper portion of the organic electroluminescence element is disclosed in Japanese Patent No. 2766095 No. However, in this configuration, the mechanical stress of the organic electroluminescence element and the color conversion filter is followed by the thermal stress generated by the environmental temperature change of the display formed, and the mechanical stress such as vibration and pressure. The electroluminescent device is subject to damage such as peeling. Further, in Japanese Laid-Open Patent Publication No. H11-121164, a base film which is a resin film is laminated between an organic electroluminescence element and a color conversion filter with a bonding layer as a color conversion filter side, and The composition of the bonding layer which also belongs to the resin film. However, in the publications, it is described that the junction of the junction -5·(3) 1272865 functions as a layer, and the step of the color conversion filter is flattened, and the function as a buffer film of the color conversion filter and the base film. However, this publication does not consider the gap adjustment between the color conversion filter and the organic electroluminescent element. Rather, it functions only as a buffer film for the underlying film, and is not instructive for mitigating stress applied to important organic electroluminescent elements. More specifically, the present invention is intended to solve the problem inherent to an organic electroluminescent display having a TFT, and the invention of the publication itself does not have a TFT and is not mentioned. [Means for Solving the Problems] According to the present invention, in order to achieve the above object, a thin film transistor formed of a source and a drain and a laminate formed on an upper portion of the thin film transistor are connected to the substrate. a first electrode formed of the source or the drain conductive thin film material, a second electrode of the upper transparent electrode formed of at least the organic electroluminescent layer and the transparent conductive thin film material, and at least one passivation layer, The thin film transistor-driven organic electroluminescence element, the color conversion layer unit or the color filter layer and the color conversion layer formed on the transparent support substrate are facing the second electrode side of the organic electroluminescence element In the arranged organic electroluminescent display, at least two of the second electrode side of the layer of the color conversion layer or the color filter layer and the color conversion layer are stacked, and at least two different Young's rates are provided. The coating layer is such that the coating layer on the second electrode side of the coating layer is adhered to the surface of the passivation layer while sealing the substrate and the support -6-(4) 1272865 The periphery of the substrate is formed. Further, in the case of using a laminated body of a color filter layer and a color conversion layer, for example, when the light emitted by the organic electroluminescence element is blue, for blue, it is only a color filter layer. For green and red, it is a layered body of a color filter layer and a color conversion layer. In the present invention, in the at least two coating layers having different Young's rates, the coating layer having the smallest Young's ratio is formed by adhering to the surface of the passivation layer in the display region of the organic electroluminescent device. good. As described above, the present invention is a substrate on which a TFT is formed and a transparent substrate on which at least a support substrate belonging to a color conversion layer are formed, and a coating layer for gap adjustment having no space on the transparent substrate side between the substrates is provided on the substrate side ( On the side of the organic electroluminescence element side, the coating layer for stress relaxation, which has no space, in particular, the coating layer for stress relaxation with a small Young's rate, the display performance is not adversely affected at the interface with the passivation layer. It is possible to avoid the generation of gas voids. That is, the coating layer having the smallest Young's rate is adhered to the passivation layer in the display region, embedding the space due to the unevenness caused by the TFT wiring, and mitigating the thermal stress applied by the environment for the organic electroluminescence display and Mechanical stress. The unevenness due to the wiring of the TFT substrate is about 1 to 2 μm, and the thickness of the coating layer having the smallest Young's ratio in which the unevenness is buried is preferably 2 to 4 μm. [Embodiment] [Embodiment of the Invention] An organic electroluminescent display of the present invention will be described below. In the following description, the first electrode is an anode, and the second electrode is a cathode (6) 1272865 (transmittance is about 50% or more), and emits light through the cathode. Further, the case of the organic electroluminescent layer in the present specification also includes the case of the positive hole injection layer, the positive hole transmission layer, and the electron injection layer. The transparent cathode is an alkali metal such as lithium or sodium, an alkaline earth metal such as potassium, calcium, magnesium or barium, or an electron injecting metal formed of such a fluoride or the like, and an alloy and compound with other metals. The electrode thin film (1 Onm or less) is used as an electron injecting layer, and a transparent conductive film such as ITO or IZO is formed thereon. The materials of the various layers of the organic electroluminescent layer are known to use. For example, an organic electroluminescent layer is intended to emit green light by monitoring color. For example, a fluorescent whitening agent such as a benzothiazole system, a benzimidazole system or a benzoxazole system, or a metal chelate oxygen lance compound is preferably used. A styrylbenzene compound, an aromatic secondary methyl compound, or the like. 3: The passivation layer on the passivation layer organic electroluminescence element is electrically insulating and has a shielding property with respect to moisture and low molecular components, and the transparency of the visible region is high (in the range of 400 to 700 nm, the transmittance is 50). More than %), preferably a material having a film hardness of 2H or more. For example, an inorganic oxide such as SiOx, SiNx, SiNxOy, AlOx, TiOx, TaOx'ZnO or the like, an inorganic nitride or the like can be used. The method for forming the passivation layer is not particularly limited as long as it does not adversely affect the organic electroluminescence device, and can be formed by a sputtering method, a CVD method, a vacuum deposition method, or the like. As long as it does not directly affect the component, it can be formed by a conventional method such as dip coating. -9- (7) 1272865 The passivation layer described above may also be a single layer, but a plurality of layers are laminated, and water opacity is more effective. The thickness of the passivation layer of the laminate is preferably 〇 1 to 5 μηη. 4: Coating layer The coating layer may be formed on the side of the organic electroluminescence element, but the organic electroluminescence element is formed of a material which is weak to heat or ultraviolet light. When it is formed on the upper surface, various restrictions occur. Therefore, it is more desirable to form a color conversion layer which is stronger against heat and ultraviolet light. The outermost coating layer on the side of the passivation layer can be formed on the upper portion of the color conversion layer without impairing the function of the color conversion layer, and is preferably high in elasticity, and the transparency of the visible region is high (in the range of 400 to 700 nm, transmittance) 50% or more), Tgl00°C or more, and a surface hardness of 2H or more in pencil hardness, and a smooth formation of a coating film on the color conversion layer, as long as it does not degrade the function of the color conversion layer, for example, for example: A quinone imine-modified oxime resin (refer to Japanese Laid-Open Patent Publication No. 5-134112, etc.), an inorganic metal compound (TiO, Abo;, Si〇2, etc.) dispersed in a propylene group, a polyimine, a ruthenium resin, or the like. (Refer to JP-A-H05-119306, etc.), and an ultraviolet-curable resin having an epoxy-modified acrylate resin (refer to Japanese Laid-Open Patent Publication No. 7-48424), an acrylate monomer, and an oligomer and a polymer. Reactive vinyl resin and photoresist resin of the mixture (refer to Japanese Patent Application Laid-Open No. Hei 6- 3 009 1 0, JP-A-9-33, 793, etc.), sol and gel method of inorganic compounds (Refer to Japanese Journal of Display, 1997, Vol. 3, No. 7, etc.), photocurable resin and/or thermosetting resin such as fluororesin (refer to Japanese Patent Laid-Open No. 5-3647). 8) 1272865. The Young's rate is preferably 0.3 MPa or more. The coating layer is maintained in a constant design for the gap described above, and if the Young's ratio is 〇, the gap may not be maintained due to external stress. Examples of the outermost coating layer of the passivation layer include, for example, a polyamide 6-6 polyamine resin, which is not a polymer material, a silicone rubber, a gel, or various synthetic rubbers in a unit structure. A material having a Young's rate of 0.3 MPa or less is preferable, and a material of 0 is more preferable. However, below O.OIMPa, since it is not formed at the time of formation of a layer, it is required to be 0.01 MPa or more. The photoresist is also used as a raw material, and a straight chain containing no straight chain has a monomer having a functional group of 3 or less, and the third dimension of the cured product is too high to be used. Or a photoresist other than the above, the amount of radiation or heating is weakened, and it is suitable as a stress relieving layer in a case where the crosslinking density is not too high. 5: color conversion filter (color filter i 1 in the color conversion layer) organic fluorescent dye in the present invention, the organic fluorescent material used in the color conversion layer absorbs light from the blue to blue-green region emitted from the luminous body, Examples of fluorescent dyes of the field are: basic ruthenium red fragrant red 3 B, basic ruthenium red 〇 1, alkaline ruthenium red 1 1 〇, red, alkaline purple Π, alkaline red 2, etc., basic scented dark blue dye, 1-ethyl-2-(4-(p-dimethylamino)-1,3-butadiene]-pyridyl-perchloro-vinyl chloride (pyridine 1), Or an oxazine dye. Further, various dyes (directly subject to the subject item: 3 MPa or less, firstly using nylon 6 containing a rigid straight base, • 1 Μ P a below * method to maintain the shape of the oligomer and crosslink density not only in the light state, Long film) Light dyes are red zone B, basic sulphur base ruthenium dye, phenyl trihydroxy pyridine dye, acid -11 - (9) 1272865 dye, basic dye, disperse dye Etc.) 萤 基 基 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 Naphthalene dyes such as γ color solvent 1 1 and yellow solvent 1 16 , etc., and various dyes (direct dyes, acid dyes, etc.) can also be used as long as they have fluorescing properties. 2) Black mask resin followed by A resin for use in the color conversion filter-curing property or the photo-heat-curing type curable resin of the present invention to generate a base or an ion species to be polymerized or exchanged. 3) Color filter layer Only the color conversion layer cannot obtain a sufficient filter layer and the color conversion layer is preferably 1 to 1·5 μηι. EXAMPLES Hereinafter, a comparative example of the present invention will be described with reference to Fig. 1 for an organic electroluminescent display according to an embodiment of the present invention. [TF butyl plate 1, 2, 3] To be fluorescent, the light in the color region can be used, and as the coumarin: 3 -(2'-benzothiazepine 6), etc. 5 1, even yellow formazan dyes. The base resin of the basic dye and the dispersion dyeing sheet is colored when it is subjected to light and/or heat treatment, and is not dissolved or melted in color purity. Thickness of the color filter layer. Figure 1 is a sketch of this section. Fig. 2 -12- (10) 1272865 As shown in Fig. 1, a bottom gate type TFT is formed on the glass substrate 1, and a source of the TFT is connected to the anode 3. The anode 3 is a contact hole formed through an insulating film formed on a TFT not shown, and forms aluminum connected to the source at the lower portion, and forms IZO (InZnO) on the upper surface thereof. The purpose of the aluminum is to reflect the light-emitting layer. The luminescence, and the efficient emission of light from the top, while reducing electrical resistance. The thickness of the aluminum film was 300 nm. The purpose of the upper IZO is to improve the working function and the injection hole with good efficiency. The thickness of IZO is 200 nm. [Organic Electroluminescence Layer 4] An organic electroluminescence element is formed by using an anode 3 / positive hole injection layer / positive hole transfer layer / organic electroluminescence layer / electron injection layer / cathode 5 (organic electroluminescence layer 4 is According to this configuration, four layers other than the two electrodes are formed). The substrate 1 on which the anode 3 is formed is mounted in a resistance heating vapor deposition apparatus, and a positive hole injection layer, a positive hole transmission layer, an organic electroluminescence layer, and an electron injection layer are sequentially formed without breaking the vacuum. At the time of film formation, the pressure in the vacuum chamber is decompressed to 1 X 1 (T4Pa. The positive hole injection layer is a layer of 100 nm copper cyanine (CuPc). The positive hole transfer layer is a layer of 20 nm 4,4 - double ( N-(l-naphthyl)-N-anilino)biphenyl (α-NPD). The organic electroluminescent layer is a layer of 30 nm 4,4-bis(2,2'-diphenylvinyl)biphenyl (〇乂8〇. The electron injecting layer is a 20nm layer of chelating (Alq). After that, it is covered with a metal to form a transparent cathode without breaking the vacuum.-13- (11) 1272865 Transparent cathode 5 is utilized In the co-evaporation method, a metal Mg/Ag having a small work function required for electron injection was formed into a film thickness of 2 nm, and an IZO film was formed thereon by a sputtering method to have a film thickness of 200 nm. [Passive layer 6] The passivation layer 6 is formed by depositing 300 nm of the SiONx film by sputtering. [Color filter layer 9] The blue filter material is coated on the transparent (glass) substrate 12 by spin coating (Fuji HANTOEREKUTORONIKUSUKUNOROJI system: color mosaic After setting CB-700 1 ), patterning is performed by the micro-diffusion method, and a line pattern of a film thickness ΙΟμιη is formed. In the light sheet material, a red and green color filter layer (not shown) is applied onto the transparent substrate 12 by spin coating, and then patterned by a micron method to form a line pattern having a film thickness of 1.5 nm. [Color Conversion Layer 10] The green fluorescent dye is a weight portion of 120 parts of ethylene glycol butyl ether acetate (PGMEA) in which coumarin 6 (0.7 parts by weight) is dissolved in a solvent. "V25gPA/P5 to which a photopolymerizable resin is added." 100 parts by weight (trade name, Nippon Steel Chemical Industry Co., Ltd.) was dissolved to obtain a coating liquid, and the coating solution was applied onto a green color filter on the transparent substrate 12 by spin coating. The patterning is performed by a micro-diffusion method to form a line pattern having a film thickness of 1 Ομιη. The red fluorescent dye is coumarin 6 (0.6 parts by weight), basic ruthenium 6G (0.3 weight SB), and alkaline purple 11 ( 0.3 parts by weight of PGMEA dissolved in a solvent. The solution was dissolved in 100 parts by weight of V25gPA / P5 of the photopolymerizable resin to obtain a coating liquid. The coating solution was applied by spin coating to the through--14- (12) 1272865 on the red color filter of the substrate 1 2' and using miniaturization Patterning is performed to form a line pattern having a film thickness of 1 μm. A black mask 厚度 (thickness 10 μm) is formed between the color conversion layers 10 of the respective colors. A black mask having a high thermal conductivity is used first in the color conversion layer wall surface. The sputtering method of the mask forming the lattice pattern forms 5,000 nm chromium oxide. Next, using the same mask, the SiN film is formed in the same thickness as the sub-pixels of R, G, and B by sputtering. . The pitch of the pixels is 0.3 x 0.3 mm, and the shape of the sub-pixels of each color is 0.1 x 0.3 mm. [First Coating Layer 7] ZPN1 10 0 (manufactured by Nippon Paint Co., Ltd.) (Young's ratio of about 5 MPa) was applied onto the upper surface of the color conversion layer 1 by spin coating, and then patterned by a micronization method to form a color conversion layer 10 The upper part. The thickness from the surface of the color conversion layer 10 is 3 μm. [Second coating layer 8] A ruthenium gel (manufactured by Toray DAUKONINGU) for stress relaxation and covering the unevenness of the TFT wiring is coated on the first coating layer 7 by a screen printing method (Young's rate is about 0.05 MPa). . In the case of screen printing, the thickness is 4 to 5 μm. However, the bonding method by applying pressure is about 1/2. The coating method of the gel is not limited to the screen printing method, and the required amount is dripped as much as possible. Yes, and it is also possible to use a method of edge coating and strip coating which can form a thin layer. [Finishing] The substrate 2 of the organic electroluminescent device and the blunt-15-(13) 1272865 layer 6 is formed on the TFT 2 thus obtained, and the color filter layer 9, the color conversion layer 1 Ο , and the black mask are formed. The cover 11, the first cover layer 7, and the transparent substrate 1 2 of the second cover layer 8 are bonded together by a UV-curable sealing resin 13 . As the sealing resin 13, a UV curable epoxy resin or a UV curable acryl based resin can be used.
此時第二被覆層8係爲與鈍化層6密著但不接著的狀 態。此乃一旦接著的話，會在自外部受到應力時，密著力 最弱的電激發光元件側會形成剝離等缺陷的緣故。 尙且，本實施例係形成兩層被覆層，但進而形成楊氏 率小的第三被覆層而密著於鈍化層，更完整除去界面凹凸 之空間的構成亦可。 比較例 第一被覆層（透明樹脂接著層7)是用負型光阻劑JNPC 一 48 (JSR製），其次不設第二被覆層，而用聚碳酸酯接著 透明基板1 2與基板1。其他條件與實施例1相同。 評估 針對下記項目進行評估。結果於表1示之。 •熱循環試驗：製作的顯示器於熱循環試驗（- 40 °C « 95 °C、120循環、溫度昇降時間5分鐘以內 )中，確認有無形狀異常。 -16- (14) 1272865 【表1】 實施例 比較例 熱循環 形狀沒有變化 發光元件發生剝離 [發明效果] 若按照本發明即可得到以下效果。At this time, the second coating layer 8 is in a state of being adhered to the passivation layer 6 but not being continued. If this is done, if stress is applied from the outside, defects such as peeling may form on the side of the electroluminescent element having the weakest adhesion. Further, in the present embodiment, a two-layer coating layer is formed, but a third coating layer having a small Youngs ratio is formed to adhere to the passivation layer, and a space in which the interface unevenness is more completely removed may be employed. Comparative Example The first coating layer (transparent resin adhesive layer 7) was a negative-type photoresist JNPC-48 (manufactured by JSR), and secondly, a second coating layer was not provided, and polycarbonate was used to bond the transparent substrate 12 to the substrate 1. Other conditions are the same as in the first embodiment. Evaluation Evaluate for the following items. The results are shown in Table 1. • Thermal cycle test: The display was confirmed to have a shape abnormality in a thermal cycle test (- 40 °C « 95 °C, 120 cycles, temperature rise and fall time within 5 minutes). -16- (14) 1272865 [Table 1] Example Comparative Example Thermal cycle shape did not change Light-emitting element peeled off [Effect of the Invention] According to the present invention, the following effects can be obtained.
首先，色彩變換濾光片與黑色遮罩不一定要以相同的 厚度形成，而且雖然會在圖案化時產生位移，並在圖案與 圖案之間形成凹部，但相關的凹凸可藉由第一被覆層加以 平坦化。加上，可藉由該第一被覆層來調整色彩變換濾光 片（色彩變換層）與有機電激發光元件的間隙。First, the color conversion filter and the black mask do not have to be formed with the same thickness, and although displacement occurs during patterning, and a concave portion is formed between the pattern and the pattern, the relevant unevenness can be covered by the first coating. The layers are flattened. Further, the gap between the color conversion filter (color conversion layer) and the organic electroluminescence element can be adjusted by the first coating layer.
更藉由楊氏率小（靈敏）的第二被覆層，具有TFT之元 件所特有的問題，就能根據TFT基板的配線覆蓋細小的 凹凸，於鈍化層的界面，防止顯示性能受到不良影響產生 氣體空隙。更且，第二被覆層也具有應力緩和的作用，對 於因熱應力等的外部環境所產生的應力，提供可靠性高的 有機電激發光顯示器。 【圖式簡單說明】 第1圖係表示本發明之有機電激發光顯示器構成的斷 面槪略圖。 第2圖係表示本發明之比較例構成的斷面槪略圖。 -17- (15) 1272865 [圖號說明]Further, the second coating layer having a small Young's rate (sensitive) has a problem unique to the TFT element, and it is possible to cover fine irregularities according to the wiring of the TFT substrate, and prevent the display performance from being adversely affected at the interface of the passivation layer. Gas gap. Further, the second coating layer also has a function of stress relaxation, and provides a highly reliable organic electroluminescence display for stress generated by an external environment such as thermal stress. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing the structure of an organic electroluminescent display of the present invention. Fig. 2 is a schematic sectional view showing the configuration of a comparative example of the present invention. -17- (15) 1272865 [Illustration of the figure]
1 基板 2 TFT 3 陽極 4 有機電激發光層 5 陰極 6 鈍化層 7 第一被覆層 8 第二被覆層 9 彩色濾光片層 10 色彩變換層 11 黑色遮罩 12 透明基板 13 密封樹脂 -18-1 substrate 2 TFT 3 anode 4 organic electroluminescent layer 5 cathode 6 passivation layer 7 first coating layer 8 second coating layer 9 color filter layer 10 color conversion layer 11 black mask 12 transparent substrate 13 sealing resin -18-