201237526 六、發明說明： 【發明所屬之技術領域】 本發明係關於與彩色濾光片一體化的微膠囊型電泳顯 示面板，關於一種多色顯示面板，該多色顯示面板由下述 結構構成：在微膠囊中封入電泳油墨，將形成的微膠囊層 配置在一組相向的電極板間，該一組相向的電極板的一個 是具有彩色濾光片層的透明基板，然後通過使用合適的彩 色濾光片，期待提高圖像質量。 【先前技術】 近年來，隨著資訊設備的發達，資訊顯示也具有各種 各樣的形態。作爲可變資訊的顯示面板，主流是CRT(陰極 射線管）或使用背光的液晶。但CRT或使用背光型的液晶顯 示器等發光型顯示器，在長時間使用時，眼睛的負擔大， 看起來疲勞，不適用於長時間連續閱讀文書等之用途。 另外，不使用背光的類型的液晶顯示器，由於使用偏 光板導致圖像明顯較暗，具有視覺性差的問題。此外，這 些顯示器的顯示圖像沒有記憶性，在停止供應電能的同 時，顯示圖像消失。需要一種即使長時間使用，看東西的 眼睛也不會疲勞，視覺性良好，耗電量少，而且具有圖像 記憶性的顯示器。 因此，作爲對眼睛負擔小的反射型顯示裝置，例如專 利文獻1所公開的內容中，提出了一種電泳式顯示面板， 其具有一組相向的電極以及設置在該電極間的電泳式顯示 層。該電泳式顯示面板和印刷的紙面同樣地通過反射光顯 -4- 201237526 示文字或圖像，所以對眼睛的負擔少，適合長時間持續觀 看畫面的作業。 該電泳式顯示面板是基於下述原理進行的：在分散了 帶電粒子的分散液上施加電壓而改變電場，從而使帶電粒 子移動，可以顯示圖像。電泳式顯示面板中，將著色的帶 電粒子封入微膠囊，將微膠囊配置在一組相向的電極間中 而形成的微膠囊型電泳式顯示面板，具有低運行電壓、高 柔韌性等優點，正被實用化、進一步開發。 除了所謂的PDA(便攜資訊終端）或電子書等可以攜帶 的資訊設備的顯示器以外，會在今後進一步普及的是：報 紙以及書、雜誌、海報等印刷品、以及從印表機等輸出到 紙上的硬拷貝，向顯示器進行顯示轉換，此時適用該電泳 式面板。該電泳式面板結構上一般是以黑白顯示爲主的兩 色顯示，爲了顯示上述雜誌或彩色印刷品，近年來需求多 色彩化。 爲了使該電泳式面板多色彩化，公開了使用兩種以上 的多色電泳粒子，例如在專利文獻2中是通過照相平版法 形成圖案，在專利文獻3中除了照相平版法以外還使用噴 墨法，將電泳粒子配置在預先確定的像素內的技術。另外， 在專利文獻4中公開了 一種顯示面板，該顯示面板通過預 先形成的收納微膠囊的盒框架，將多個微膠囊準確地設置 在所希望的位置上，從而可以多種顏色顯示。但是，將多 種顏色的微膠囊配置在預先確定的像素中的方法與普通的 201237526 光阻劑等相比，實際情況是步驟多、複雜，技術困難多。 因此，在專利文獻5中發表了通過將彩色濾光片基板 貼合到黑白電泳式顯示面板上，從而使微膠囊和像素間不 需要位置精度的可以多色顯示的方式。但是，該方式由於 在作爲反射型顯示面板的黑白電泳式顯示面板上’貼合另 外製造的彩色濾光片基板，所以必須在中間插入貼合用的 黏結層，所以其顯示亮度低下，此外由於彩色濾光片基板 的貼合困難，還具有生產性低下的問題。此外，由於濾色 層和電泳層式顯示層間存在距離，因此根據觀看角度會產 生顏色的視覺差異，導致丟掉了無觀察角度影響這樣的電 子紙的優點。 因此，本發明的發明人發現通過在彩色濾光片的透明 電極層上直接層疊微膠囊油墨，可圖謀顯示亮度和視角之 提升。但是，彩色濾光片層的膜厚變化對反射濃度的影響 變得更大。另外，分散了的微膠囊的塗敷液的觸變性 (thixotropy)(以下，稱爲觸變性）非常高。因此，在塗布塗 敷液時，由於底層的不均勻，暫時產生的不均勻的塗布斑 在乾燥前的狀態下，也沒有平面化、均勻化。因此’爲了 〇 在全部顯示畫面中進行不均勻的高精度的彩色顯示’觀看 側的彩色濾光片的平滑性很重要，該觀看側由作爲微膠囊 的被塗布基材的透明電極層的底層構成。 [先前技術文獻] [專利文獻] 201237526 [專利文獻1]日本特公昭50-015115號公報 [專利文獻2]日本特開2002-365668號公報 [專利文獻3]曰本特開2003-156770號公報 [專利文獻4]曰本特開2003-295234號公報 [專利文獻5]日本特開2003-161964號公報 【發明内容】 [所欲解決之課題] 本發明是鑒於上述問題提出的，課題在於提供一種多 色顯示面板’其可以改善在多色顯示微膠囊型電泳式顯示 面板中’顯示亮度低下以及視角狹窄化的問題，而且顯示 質量的均質性優異。 [解決課題之手段] 本發明的發明人對上述問題進行認真的硏究，結果發 現通過將彩色濾光片層的平滑性調節在一定範圍內，可容 易均勻地塗布微膠囊油墨，濃度不均少，可以得到其圖像 質量有望提高的多色顯示面板，從而完成了本發明。 也就是，本發明申請專利範圍第1項的發明是一種多 色顯示面板，該多色顯示面板是以透明基板、彩色濾光片 層、透明電極層、微膠囊層、黏結劑層、背面電極板的順 序層疊構成的，前述微膠囊層直接層疊在前述透明電極層 上，前述微膠囊層是將微膠囊分散到黏結劑樹脂中構成 的，前述微膠囊封入了在透明分散介質中分’散電泳粒子而 得到的分散液，通過施加電壓而產生的電場改變來改變光 學的反射性質；前述背面電極板是在基材上配置像素電極 201237526 形成的電極板；其特徵在於： 在多色顯示面板中，前述彩色濾光片層的膜厚在0.5~2.0μηι 的範圍內，顯示畫面內的像素間以及像素內的級差（膜厚差） 爲0.3 μπι以內，鄰接的各像素之間沒有重疊，而且梯形的 各像素的頂部邊緣是離像素邊界5.0 μηι以內。 另外，本發明的申請專利範圍第2項的發明是申請專 利範圍第1項所記載的多色顯示面板，其特徵在於：前述 電泳粒子是具有兩種不同表面電荷的粒子，其中一種是著 色粒子，另一種是白色粒子。 在本發明的多色顯示面板中，通過在膜厚差少、平滑 性高的彩色濾光片層上所具有的透明電極層上直接形成微 膠囊層，容易均勻地塗布微膠囊油墨，而且作爲顯示表面 的微膠囊層和彩色濾光片層的距離配置得非常接近，可以 得到顯·示質量提高的多色顯示面板。另外，得到以下多色 顯示面板，其是反射型顯示面板，光二次通過而產生的、 由彩色濾光片層的膜厚差引起的顏色濃度不均少。 另外，與貼合另外製造的彩色濾光片基板形成的現有 的顯示面板相比，本發明的結構中，在微膠囊層和彩色濾 光片層間存在不需要黏結劑等的層，由微膠囊層反射的反 射光通過最低限度的層，顯示亮度比前述現有的顯示面板 更高。 另外，由於彩色濾光片層和微膠囊層的距離分開而觀 察到的微膠囊層的顯示和彩色濾光片的顏色偏差，也是通 過使微膠囊接近彩色濾光片層，從而沒有觀察到前述那樣 201237526 的視覺差，沒有引起視角的狹窄。 另外，在本發明的多色顯示面板中，彩色濾光片層的 平滑性高，其上形成的透明電極層平滑，容易使其成對形 成的像素電極層的間隔保持一定，所以在微膠囊上施加均 勻的電壓，沒有顯示不均，提高圖像顯示質量。 【實施方式】 對本發明的多色顯示面板，基於其一個實施態樣如下 詳細說明。 第1圖是通過剖面說明本發明的一個實施方案的多色 顯示面板的結構例的簡圖，第2圖是通過其放大的剖面進 行說明的示意圖。如第1圖和第2圖所示，本發明的多色 顯示面板是在透明基板（1)上具有彩色濾光片層（2)和透明 電極層（4)，而且層疊帶微膠囊的彩色濾光片和背面電極板 的剖面結構，其中帶微膠囊的彩色濾光片是在前述透明電 極層（4)上直接層疊微膠囊層（1〇)形成的，微膠囊層（1〇)是 將微膠囊（5)分散到黏結劑樹脂（1 1)中形成的，微膠囊（5)封 入了在透明分散介質中分散有電泳粒子的分散液，通過施 加電壓而產生的電場改變而改變光學的反射性質；背面電 極板是由在前述微膠囊層（10)上通過黏結劑層（16)配置像 素電極（30)的背面基材（50)形成的。 另外，雖然沒有圖示，但是根據需要，可以在微膠囊 層（10)上’設置用於減少微膠囊（5)的凹凸的只外塗了黏結 劑樹脂的表面平滑層。 201237526 作爲透明基板（1)，可以使用鈉鈣玻璃、低鹼硼矽酸玻 璃、無鹼硼矽酸鋁玻璃等玻璃板，或聚對苯二甲酸乙二酯 (PET)和聚碳酸酯、聚醯亞胺、聚萘二甲酸乙二酯、聚醚颯、 丙烯酸樹脂、聚氯乙烯等樹脂板。 在本發明的多色顯示面板中，彩色濾光片層（2)的平面 圖案形狀沒有特別的限定，可以適當使用合適的形狀，例 如將微細帶（條紋）狀的濾光片段平行或交叉配置，或者將 微細的濾光片段以縱橫一定的陣列配置而構成。例如，並 不限於如第4圖所示的大量使用組合了 RGBW的像素結 構。本發明中使用的彩色濾光片層（2)中，設置多個著色圖 案，圖像區域分別配置著色像素。著色像素是在每個像素 上將透射光著色，一般配列相當於光的三原色的紅色（R)、 綠色（G)、藍色（B)這三種顏色，或者黃色（Y)、品紅（M)、 青色（C)的3原色的著色像素。另外，此處，W是光隔板等 中使用的透明樹脂，爲了能夠利用更多反射光、提高亮度， 和著色像素組合使用，在構成本發明的多色顯示面板的彩 色濾光片層中，不使用普通的黑色矩陣。 在本發明的多色顯示面板中，彩色濾光片層（2)的剖面 形狀如第3圖所示，由微膠囊油墨的塗布適應性和圖像顯 示性質，調節爲一定的形狀。彩色濾光片層的膜厚爲 0·5~2·0μιη，較佳爲0.7〜1 ·3μιη的範圍。在本發明的多色顯 示面板中，由於光兩次通過彩色濾光片層，所以爲了確保 亮度，使用膜厚比透過型的更薄，或者具有透過率高的顏 -10- 201237526 色性質的著色樹脂。在膜厚小於0·5μιη時，無法保持必要 的著色濃度以及和透明基板的黏結性的平衡。另外，在膜 厚超過2·0μιη時，具有無法抑制顯影等中膜厚變化的問題。 顯示畫面內的像素間的級差（膜厚差）爲〇·3μιη以內、 較佳爲0.1 μ m。如果像素間的級差超過0 · 3 μ m，則確認有顏 色濃度差，.或者在微膠囊油墨的塗布膜上產生起伏這樣的 不均勻，會影響圖像顯示。該膜厚差可以通過抗蝕劑油墨 的組成、曝光條件以及顯影條件等控制。 另外，在使用背光的液晶顯示面板用彩各濾光片中， 爲了避免對比度和混色，各像素圖案間使用黑色矩陣 (BM)，另外，在不使用BM時，爲了避免光透過，還使鄰 接的像素之間重疊。因此，像素的邊緣突起，在其高度超 過0.3 μιη時，微膠囊油墨產生偏差，影響塗布面的均勻性。 因此，對本發明的彩色濾光片而言，不使像素之間重疊。 各像素最終的剖面形狀通常爲梯形，鄰接的各像素之間是 通過其梯形的底部邊緣接觸或略微偏離的狀態，並不重 疊，而且，梯形的各像素的頂部邊緣離開像素邊界5. Ομιη 以內，較佳爲3.5 μιη以內。通過形成這種剖面形狀，可以 形成下述這樣的顯示面板：像素沒有突起、微膠囊油墨沒 有偏向一方地塗布，同時可以抑制表面起伏所見的圖像不 均的產生；而且反射光的利用效率良好、亮度高。 該彩色濾光片層的製造一般如下進行：將在感光性樹 脂上分散混入顏料或染料等著色劑形成的著色感光性樹脂 -11 - 201237526 或透明的感光性樹脂，通過旋塗法或無旋塗布法，在玻璃 基板上以均勻的厚度塗布，乾燥除去剩餘的溶劑後，通過 照相平版法對該抗蝕膜以所希望形狀的光罩，通過鄰近曝 光（接近曝光）等使用超高壓水銀燈，照射活性能量線，固 化（負型）或提高鹼溶解度（正型），除去鹼溶液等溶解的部 分’以進行顯影、後烘焙，重複進行必要數量的這種操作。 另外’在本發明中，上述製造方法沒有特別的限定。 然後，在彩色濾光片層（2)上根據需要將表面硏磨、平 整化後，設置透明電極層（4)。可以作爲透明電極材料使用 的材料，例如是ITO等氧化銦類、氧化錫類、氧化鋅類這 樣的具有透明性的導電性氧化物等。該透明電極可以使用 蒸鍍法、濺鍍法、CVD法等現有技術形成。 以下，對構成本發明的多色顯示面板的帶微膠囊的彩 色濾光片的顯示原理進行槪要描述。 如第2圖所示，背面基材（50)上的像素電極（30)連接各 個像素電極的開關元件（未表示），可以在其和透明電極層（4) 之間施加正負的電壓。爲了顯示圖像，通常，像素電極（30) 連接有源矩陣型驅動方式的電^結構的電源。如果在像素 電極（30)上施加電壓，則施加在微膠囊層（10)上的電場會變 化。在像素電極（30)爲正極時，微膠囊（5)內的帶負電的粒 子向背面的像素電極（3 0)側移動，帶正電的粒子移動到前 面的透明電極層（4)側。同樣地，如果像素電極（30)爲負極， 則帶正電的粒子移動到像素電極側，帶負電的粒子往透明 -12- 201237526 電極層4側移動。這裏，例如假設黑色粒子帶正電，白色 粒子帶負電，則顯示顔色是往前面的透明電極層（4)側移動 的粒子的顏色，來自觀_側的光在其上反射，反射光通過 相向的彩色濾光片層的著色圖案，可以帶顏色地顯示所希 望的文字或圖像。 接著，進一步說明本發明的多色顯示面板使用的材 料、部件。 形成帶微膠囊的彩色濾光片時使用的微膠囊（5)，由著 色粒子（6)、白色粒子（7)、透明分散介質（8)和微膠囊殻（9) 構成。 一般來說，微膠囊型電泳式顯示面板中使用的微膠囊 通過篩分法或比重分離法等精製，平均粒徑是30〜ΙΟΟμιη， 此外，相對於膠囊的平均粒徑，具有前後1 0 μιτι以內的粒 徑的微膠囊的比例至少超過50%。本發明的多色顯示面板 中使用的微膠囊，在微膠囊層中調節爲前述粒度分佈。 微膠囊分散液使用醇等水類溶劑，如果沒有特別的問 題，使用水。 作爲分散介質（8)，從帶電粒子可良好、穩定地帶電的 絕緣性液體，也就是實質上不溶於水的有機溶劑中選擇。 例如可以列舉出十二烷醇、十一烷醇等長鏈醇類溶劑，二 丁基酮、甲基異丁基酮等多碳酮類，戊烷、己烷、辛烷等 脂肪烴，環己烷、甲基環己烷等脂環烴，苯、甲苯、二甲 苯、己基苯、丁基苯、辛基苯、壬基苯、癸基苯、--院 -13- 201237526 基苯、十二烷基苯、十三烷基苯、十四烷基苯等具有長鏈 烷基的苯類等芳烴，或二氯甲烷 '氯仿、四氯化碳、1，2-二氯乙烷等幽代烴以及矽油、橄欖油等各種油類的任意一 種單一成分或者它們的混合物。 作爲著色粒子（6)的黑色電泳粒子中，除了苯胺黑、碳 黑等黑色顏料以外，還可以使用玻璃或樹脂等的細微粉 末、以及它們的複合體等。另外，在通過彩色濾光片進行 多色顯示的本發明的多色顯示面板中，通常使用採用了碳 黑的黑色粒子。另外，作爲白色粒子（7)的白色電泳粒子使 用公知的氧化鈦、二氧化矽、氧化鋁、氧化鋅等白色無機 顏料’乙酸乙烯酯乳狀液等有機化合物以及它們的複合體 等。 另外，著色粒子（6)和白色粒子（7)根據需要可以使用各 種表面活性劑、分散劑、有機和無機化合物、金屬等處理 粒子的表面，從而不僅可以賦予所希望的表面電荷，而且 可以提高透明分散介質（8)中的分散穩定性。 將著色粒子（6)和白色粒子（7)分散到透明分散介質（8) 中的分散液A使用混合凝聚法等相分離法、表面聚合法、 原位聚合（in-situ)法、溶解分散冷卻法等公知的方法封入微 膠囊中。微膠囊的殻（9)例如是橡膠或明膠的膜。作爲形成 微膠囊的材料，優選充分透過光的材料，具體地，可以列 舉出尿素-甲醛樹脂、三聚氰胺-甲醛樹脂、聚酯樹脂、聚 氨酯樹脂 '聚乙烯樹脂、聚苯乙烯樹脂、聚醯胺樹脂、丙 -14- 201237526 烯酸酯樹脂、甲基丙烯酸酯樹脂、醋酸乙烯酯樹脂、橡膠、 明膠等。它們可以單獨或混合兩種以上使用。 在分散了精製的粒徑分佈不同的微膠囊分散液中，混 合增稠劑、表面活性劑和黏結劑樹脂（1 1 )等，調配微膠囊 油墨。在微膠囊油墨的黏結劑樹脂（11)使用聚乳酸、酣醒 樹脂、聚丙烯樹脂、丙烯酸樹脂、聚氨酯樹脂等介電體樹 脂。另外’調配兩種以上的微膠囊油墨後，將它們混合時， 爲了防止混合後的油墨密度變化，將混合的油墨的密度調 節爲相等。 微膠囊層（10)按如下方式形成：如前所述，將前述微 膠囊油墨直接塗布在透明基板（1)的透明電極層（4)上，透明 基板（1)由玻璃基板或樹脂基板構成，並預先設置了彩色濾 光片層（2)、透明電極層（4)。塗布使用絲網印刷方式、微凹 版塗布器、接觸輥塗覆機、逗號塗布器 '狹縫式塗布機、 鋼絲棒塗布器、簾式塗布器等塗布裝置進行，在本發明中 可以較佳使用縫模塗布機。 像上述那樣形成的微膠囊層（10)由於表面具有凹凸， 所以難以使夾住微膠囊的電極間的距離一定。因此，可以 在微膠囊層（10)上塗布表面平滑化油墨，形成表面平滑 層。通過形成該表面平滑層，可以將黏結劑直接塗布在表 面平滑層上。這可以避免下述問題：如果沒有表面平滑層， 直接塗布黏結劑，在微膠囊層（10)上具有針孔等未塗布的 位置，則黏結劑直接接觸彩色濾光片側的透明電極層（4)， -15- 201237526 介電常數變化，難以在微膠囊上施加電壓，顯示不明確。 表面平滑化油墨是作爲黏結劑的樹脂在溶劑中分散形 成的。作爲黏結劑成分，較佳爲和微膠囊油墨中使用的黏 結劑樹脂成分或黏結劑層中使用的黏結劑成分介電常數相 同的樹脂。特別是，最佳和微膠囊油墨、黏結劑層中使用 的黏結劑樹脂成分相同，而且和表面平滑化油墨的黏結劑 樹脂成分也相同。如果使用介電常數不同的樹脂，則在電 極間層疊介電常數不同的樹脂，而且各樹脂的厚度根據在 該部分所具有的微膠囊的尺寸，形成不同的狀態。如果這 樣，則由於各樹脂的介電常數的不同，施加在微膠囊上的 電壓難以在全部畫面區域保持均勻。 作爲表面平滑化油墨的溶劑，可以使用微膠囊油墨中 使用的溶劑，也可以使用其他醇等水性溶劑。表面平滑化 油墨使用簾式塗布器、縫模塗布機等塗布裝置塗布。刮刀 塗布等切斷塗布液的塗布方式由於使微膠囊層內的微膠囊 破裂，所以無法使用。 表面平滑層的厚度較佳爲1〇〜30μηι。在ΙΟμιη以下時， 微膠囊由於表面的凹凸而不平滑。而在30μπι以上時，電 極間距離寬，會造成驅動電壓升高。 如上形成表面平滑層，使溶劑充分蒸發，形成帶微膠 囊的彩色濾光片。該帶微膠囊的彩色濾光片和在背面基材 配置了像素電極的背面電極板貼合、進行層疊，從而完成 本發明的電泳式多色顯示面板，該貼合中，通過黏結劑層 -16 * 201237526 使彩色濾光片的著色圖案（像素）和背面電極的像素電極位 置重合。 可以作爲黏結劑使用的物質，較佳爲聚胺基甲酸酯類 黏結劑、丙烯酸樹脂類黏結劑等合成樹脂類黏結劑。特佳 使用高.介電體樹脂的黏結劑。 黏結劑還可以直接塗布到上述微膠囊層或像.素電極 上，在本發明的製造方法中，較佳在矽膜和樹脂基板間形 成了導電層的樹脂玻璃基板上，塗布使用了和前述微膠囊 油墨中使用的黏結劑樹脂同樣成分的黏結劑，作爲黏結劑 片而適當使用。通過使用和微膠囊油墨中使用的黏結劑樹 脂同樣成分的黏結劑，可以舉出下述優點：提高與樹脂介 面的親和性，不會產生剝離，而且由於介電常數類似，所 以施加在微膠囊上的電壓容易在面內保持一定。 另外，通過使用在矽膜和樹脂基板間形成了導電層的 樹脂剝離基板，進行所謂的彩色濾光片電泳顯示方式的前 面板的驅動評價、質量確認。該彩色濾光片電泳顯示方式 的前面板爲在帶微膠囊的彩色濾光片上層疊碾壓上述黏結 劑片形成的多層基板。另外，這裏的導電層由於不需要透 明性，所以可以是蒸鍍、電沉積銅、鋁等金屬形成的薄膜， 以及塗布形成導電性聚合物的膜。 [實施例] 以下’對本發明的具體實施例進行說明。 <實施例1 > -17- 201237526 將用聚乙烯樹脂覆蓋表面的平均粒徑3 μπι的氧化鈦粉 末（白色粒子）和通過氯化烷基三甲基銨表面處理的平均粒 徑4μιη的碳黑粉末（黑色粒子）在透明分散介質四氯乙烯中 分散，得到分散液Α。在這種情況下，白色粒子帶負電， 黑色粒子帶正電。 接著，在水中溶解明膠和聚苯乙烯磺酸鈉，製備水溶 液，和分散液A混合，將液溫調節到40°C後，邊保持液溫， 邊通過均化器攪拌，得到O/W乳狀液。 接著，將得到的0/W乳狀液和在水中溶解了阿拉伯樹 膠的水溶液使用分散器在4(TC下混合，邊將液溫維持在 4〇°C邊使用醋酸，將溶液的pH調節爲4,通過複合凝聚法 形成以明膠-阿拉伯樹膠爲殼材的微膠囊》 然後，將液溫降低到5°C後，加入37質量％福馬林溶 液，使微膠囊殻的壁材固化，得到封入了分散白色粒子（氧 化鈦粒子）和黑色粒子（碳黑粒子）的分散液A的微膠囊。 篩分這樣得到的微膠囊，使粒徑大小一致，以使平均 粒徑爲40μιη，而且30〜50μιη的粒徑的微膠囊的比例是50% 以上。 接著，以使上述粒徑一致的微膠囊爲固體成分，調節 固體成分40質量％的微膠囊的水分散液。將該水分散液、 固體成分25質量％的聚氨酯類黏結劑（CP-7 05 0、DIC株式 會社製造）、表面活性劑、增稠劑和純水混合，製造微膠囊 油墨。 -18- 201237526 另一方面，通過以下方法製造彩色濾光片。這裏的份 _全部是質量份。首先，以環己酮爲溶劑，使50份甲基丙烯 酸丁酯、20份甲基丙烯酸甲酯、30份丙烯酸共聚，製造丙 烯酸樹脂。 對該丙烯酸樹脂25份，以溶劑爲47份的比例，製造 丙烯酸樹脂溶液，在其中混合20份紅色顏料（Pigment Red 22)，通過珠磨分散1小時。之後，再通過分散器混合作爲 感光性單體的4份二季戊四醇、4份六丙烯酸酯和作爲光 聚合引發劑的0.3份二（2,4,6-三甲基苯甲醯基）-苯基膦氧 化物，製備紅色光致抗蝕材料。 將該紅色光致抗蝕材料旋塗到縱400mmx橫320mm、 厚度0.7 mm的透明玻璃基板上，在常溫下放置5分鐘，使 膜表面平滑後，在70 °C下乾燥20分鐘，形成紅色的光致 抗蝕層。201237526 VI. Description of the Invention: [Technical Field] The present invention relates to a microcapsule type electrophoretic display panel integrated with a color filter, and relates to a multicolor display panel which is constituted by the following structure: The electrophoretic ink is sealed in the microcapsule, and the formed microcapsule layer is disposed between a pair of opposing electrode plates, one of which is a transparent substrate having a color filter layer, and then by using suitable color Filters are expected to improve image quality. [Prior Art] In recent years, with the development of information equipment, information display has various forms. As a display panel of variable information, the mainstream is a CRT (cathode ray tube) or a liquid crystal using a backlight. However, a CRT or a light-emitting display such as a backlit liquid crystal display has a large burden on the eyes and looks tired when used for a long period of time, and is not suitable for use in a continuous reading instrument for a long time. In addition, a liquid crystal display of a type that does not use a backlight has a problem that the image is significantly dark due to the use of a polarizing plate, and has a problem of poor visibility. In addition, the display images of these displays have no memory, and the display image disappears while the supply of power is stopped. There is a need for a display that is not fatigued, has good visibility, consumes less power, and has image memory, even when used for a long time. Therefore, as a reflective display device having a small eye burden, for example, as disclosed in Patent Document 1, an electrophoretic display panel having a pair of opposing electrodes and an electrophoretic display layer disposed between the electrodes is proposed. In the same manner as the printed paper surface, the electrophoretic display panel displays text or images by reflecting light -4- 201237526, so that the burden on the eyes is small, and it is suitable for the operation of viewing the screen for a long time. The electrophoretic display panel is based on the principle that a voltage is applied to a dispersion in which charged particles are dispersed to change an electric field, whereby charged particles are moved, and an image can be displayed. In the electrophoretic display panel, a microcapsule-type electrophoretic display panel in which colored charged particles are enclosed in microcapsules and microcapsules are arranged in a pair of opposing electrodes has the advantages of low operating voltage, high flexibility, and the like. It has been put into practical use and further developed. In addition to the display of portable information devices such as PDAs (portable information terminals) or e-books, it will be further popular in the future: newspapers, prints of books, magazines, posters, etc., and output from printers to paper. Hard copy, display conversion to the display, this electrophoretic panel is applied at this time. The electrophoretic panel structure is generally a two-color display mainly composed of black and white display, and in order to display the above-mentioned magazine or color print, it has been demanded in many colors in recent years. In order to multi-color the electrophoretic panel, it is disclosed to use two or more kinds of multi-color electrophoretic particles, for example, in Patent Document 2, a pattern is formed by photolithography, and in Patent Document 3, an inkjet is used in addition to the photolithography method. A technique in which electrophoretic particles are disposed in predetermined pixels. Further, Patent Document 4 discloses a display panel which can accurately display a plurality of microcapsules at a desired position by a previously formed cartridge frame for accommodating microcapsules, thereby being displayable in a plurality of colors. However, the method of arranging microcapsules of a plurality of colors in predetermined pixels is more complicated, complicated, and technically difficult than the conventional 201237526 photoresist. For this reason, Patent Document 5 discloses a method in which a color filter substrate is bonded to a black-and-white electrophoretic display panel so that multi-color display is not required between the microcapsules and the pixels. However, in this method, since a separately manufactured color filter substrate is bonded to a black-and-white electrophoretic display panel as a reflective display panel, it is necessary to insert a bonding layer for bonding in the middle, so that the display brightness is low, and The color filter substrate is difficult to bond and has a problem of low productivity. In addition, since there is a distance between the color filter layer and the electrophoretic layer display layer, a visual difference in color is generated depending on the viewing angle, resulting in the loss of the advantage of such an electronic paper having no observation angle. Therefore, the inventors of the present invention have found that by directly laminating the microcapsule ink on the transparent electrode layer of the color filter, it is possible to exhibit an increase in brightness and viewing angle. However, the influence of the film thickness change of the color filter layer on the reflection density becomes larger. Further, the thixotropy (hereinafter referred to as thixotropic) of the coating liquid of the dispersed microcapsules is extremely high. Therefore, when the coating liquid is applied, uneven coating spots which are temporarily generated due to unevenness of the underlayer are not planarized or homogenized in the state before drying. Therefore, it is important to perform smoothness of the color filter on the viewing side in order to perform uneven high-precision color display in all display screens, which is the bottom layer of the transparent electrode layer as the coated substrate of the microcapsules. Composition. [PRIOR ART DOCUMENT] [Patent Document 1] Japanese Patent Publication No. JP-A-2005-156776 (Patent Document 3) JP-A-2002-365668 (Patent Document 3) [Patent Document 4] JP-A-2003-295234 [Patent Document 5] JP-A-2003-161964 SUMMARY OF INVENTION [Problem to be Solved] The present invention has been made in view of the above problems, and an object thereof is to provide A multi-color display panel which can improve the problem of low display brightness and narrow viewing angle in a multi-color display microcapsule type electrophoretic display panel, and is excellent in uniformity of display quality. [Means for Solving the Problem] The inventors of the present invention have earnestly studied the above problems, and as a result, it has been found that by adjusting the smoothness of the color filter layer within a certain range, the microcapsule ink can be easily and uniformly applied, and the density is uneven. The present invention has been completed by obtaining a multicolor display panel whose image quality is expected to be improved. That is, the invention of claim 1 of the present invention is a multicolor display panel which is a transparent substrate, a color filter layer, a transparent electrode layer, a microcapsule layer, a binder layer, and a back electrode. The microcapsule layer is directly laminated on the transparent electrode layer, and the microcapsule layer is formed by dispersing the microcapsules in a binder resin, and the microcapsules are enclosed in a transparent dispersion medium. a dispersion obtained by electrophoresing particles, which changes an optical reflection property by applying a voltage to change an optical reflection property; the back electrode plate is an electrode plate formed by disposing a pixel electrode 201237526 on a substrate; and is characterized by: a multicolor display panel The film thickness of the color filter layer is in the range of 0.5 to 2.0 μm, and the level difference (film thickness difference) between pixels in the display screen and in the pixel is 0.3 μm or less, and there is no overlap between adjacent pixels. And the top edge of each pixel of the trapezoid is within 5.0 μηι from the pixel boundary. Further, the invention of claim 2 is the multicolor display panel according to the first aspect of the invention, wherein the electrophoretic particle is a particle having two different surface charges, one of which is a colored particle. The other is white particles. In the multicolor display panel of the present invention, the microcapsule layer is directly formed on the transparent electrode layer provided on the color filter layer having a small difference in film thickness and high smoothness, and the microcapsule ink is easily applied uniformly, and The distance between the microcapsule layer and the color filter layer of the display surface is arranged very close, and a multicolor display panel with improved display quality can be obtained. Further, the following multi-color display panel is obtained, which is a reflective display panel, and the color density unevenness caused by the difference in film thickness of the color filter layer caused by the light passing twice is small. Further, in the structure of the present invention, a layer which does not require a binder or the like exists between the microcapsule layer and the color filter layer, and is composed of microcapsules, as compared with the conventional display panel formed by laminating a separately manufactured color filter substrate. The reflected light reflected by the layer passes through the minimum layer, and the display brightness is higher than the aforementioned conventional display panel. In addition, the display of the microcapsule layer and the color deviation of the color filter observed due to the separation of the distance between the color filter layer and the microcapsule layer are also obtained by bringing the microcapsules close to the color filter layer, thereby not observing the foregoing. The visual difference of 201237526 did not cause the narrowness of the angle of view. Further, in the multicolor display panel of the present invention, the color filter layer has high smoothness, and the transparent electrode layer formed thereon is smooth, and it is easy to keep the interval of the pixel electrode layers formed in pairs constant, so that the microcapsules are in the microcapsules. A uniform voltage is applied to the display, and unevenness is not displayed, thereby improving the image display quality. [Embodiment] The multicolor display panel of the present invention will be described in detail below based on an embodiment thereof. Fig. 1 is a schematic view showing a configuration example of a multicolor display panel according to an embodiment of the present invention, and Fig. 2 is a schematic view showing an enlarged cross section. As shown in FIGS. 1 and 2, the multicolor display panel of the present invention has a color filter layer (2) and a transparent electrode layer (4) on a transparent substrate (1), and is laminated with color of microcapsules. a cross-sectional structure of the filter and the back electrode plate, wherein the color filter with microcapsules is formed by directly laminating a microcapsule layer (1 〇) on the transparent electrode layer (4), and the microcapsule layer (1 〇) is The microcapsules (5) are dispersed in the binder resin (11), and the microcapsules (5) are sealed with a dispersion in which electrophoretic particles are dispersed in a transparent dispersion medium, and the electric field generated by applying a voltage changes to change the optical The reflective property is formed by a back substrate (50) on which the pixel electrode (30) is disposed on the aforementioned microcapsule layer (10) via a binder layer (16). Further, although not shown, a surface smoothing layer coated with only a binder resin for reducing the unevenness of the microcapsules (5) may be provided on the microcapsule layer (10) as needed. 201237526 As the transparent substrate (1), glass plates such as soda lime glass, low alkali borosilicate glass, alkali-free borosilicate glass, or polyethylene terephthalate (PET) and polycarbonate can be used. A resin plate such as quinone imine, polyethylene naphthalate, polyether oxime, acrylic resin, or polyvinyl chloride. In the multicolor display panel of the present invention, the planar pattern shape of the color filter layer (2) is not particularly limited, and a suitable shape can be suitably used, for example, a microstrip (striped) filter segment is parallel or crossed. Configuration, or a fine filter segment is configured in a vertical and horizontal array. For example, it is not limited to a large number of pixel structures in which RGBW is combined as shown in Fig. 4. In the color filter layer (2) used in the present invention, a plurality of coloring patterns are provided, and colored pixels are arranged in the image areas. The colored pixels are colored with transmitted light on each pixel, and are generally arranged in three colors of red (R), green (G), and blue (B) corresponding to the three primary colors of light, or yellow (Y), magenta (M). ), the colored pixels of the three primary colors of cyan (C). Here, W is a transparent resin used in a light-blocking plate or the like, and is used in combination with colored pixels in order to utilize more reflected light and increase brightness, in the color filter layer constituting the multicolor display panel of the present invention. , do not use the ordinary black matrix. In the multicolor display panel of the present invention, the cross-sectional shape of the color filter layer (2) is adjusted to a constant shape as shown in Fig. 3 by the coating suitability and image display properties of the microcapsule ink. The film thickness of the color filter layer is from 0.5 to 2.0 μm, preferably from 0.7 to 1 ·3 μm. In the multicolor display panel of the present invention, since the light passes through the color filter layer twice, in order to secure the brightness, the film thickness is thinner than that of the transmissive type, or the light transmittance is high. Colored resin. When the film thickness is less than 0.5 μm, the balance between the necessary coloring concentration and the adhesion to the transparent substrate cannot be maintained. Further, when the film thickness exceeds 2.0 μm, there is a problem that the film thickness change in development or the like cannot be suppressed. The level difference (film thickness difference) between the pixels in the display screen is within 〇3 μmη, preferably 0.1 μm. If the level difference between the pixels exceeds 0 · 3 μ m, it is confirmed that there is a difference in color density, or unevenness such as undulation on the coating film of the microcapsule ink affects image display. The difference in film thickness can be controlled by the composition of the resist ink, exposure conditions, development conditions, and the like. Further, in the color filter for a liquid crystal display panel using a backlight, in order to avoid contrast and color mixture, a black matrix (BM) is used between each pixel pattern, and when BM is not used, in order to avoid light transmission, a neighbor is also used. The pixels overlap. Therefore, when the edge of the pixel is raised, when the height exceeds 0.3 μm, the microcapsule ink is deviated, which affects the uniformity of the coated surface. Therefore, for the color filter of the present invention, the pixels are not overlapped. The final cross-sectional shape of each pixel is generally trapezoidal, and the adjacent pixels are in contact with or slightly offset from the bottom edge of the trapezoid, and do not overlap, and the top edge of each pixel of the trapezoid is away from the pixel boundary 5. Ομιη Preferably, it is within 3.5 μηη. By forming such a cross-sectional shape, it is possible to form a display panel in which the pixels are not protruded, the microcapsule ink is applied without being biased toward one side, and the occurrence of image unevenness seen by surface undulations can be suppressed; and the utilization efficiency of the reflected light is good. ,High Brightness. The color filter layer is generally produced by dispersing a coloring photosensitive resin -11 - 201237526 formed of a coloring agent such as a pigment or a dye onto a photosensitive resin, or a transparent photosensitive resin by spin coating or spin-free. The coating method is applied to a glass substrate at a uniform thickness, and after drying to remove the remaining solvent, the resist film is formed into a desired shape by a photolithography method, and an ultrahigh pressure mercury lamp is used by proximity exposure (proximity exposure) or the like. Irradiation of the active energy ray, curing (negative) or increasing the alkali solubility (positive type), removing the dissolved portion of the alkali solution or the like for development, post-baking, and repeating the necessary number of such operations. Further, in the present invention, the above production method is not particularly limited. Then, the surface of the color filter layer (2) is honed and planarized as needed, and then a transparent electrode layer (4) is provided. A material which can be used as a transparent electrode material is, for example, a transparent conductive oxide such as indium oxide such as ITO, tin oxide or zinc oxide. The transparent electrode can be formed by a conventional technique such as a vapor deposition method, a sputtering method, or a CVD method. Hereinafter, the principle of display of the color filter with microcapsules constituting the multicolor display panel of the present invention will be briefly described. As shown in Fig. 2, the pixel electrode (30) on the back substrate (50) is connected to a switching element (not shown) of each pixel electrode, and a positive and negative voltage can be applied between the pixel electrode (30) and the transparent electrode layer (4). In order to display an image, generally, the pixel electrode (30) is connected to a power supply of an active matrix type driving type. If a voltage is applied to the pixel electrode (30), the electric field applied to the microcapsule layer (10) changes. When the pixel electrode (30) is a positive electrode, the negatively charged particles in the microcapsule (5) move toward the pixel electrode (30) side of the back surface, and the positively charged particles move to the front side of the transparent electrode layer (4). Similarly, if the pixel electrode (30) is a negative electrode, the positively charged particles move to the pixel electrode side, and the negatively charged particles move toward the transparent -12-201237526 electrode layer 4 side. Here, for example, assuming that the black particles are positively charged and the white particles are negatively charged, the display color is the color of the particles moving toward the front transparent electrode layer (4) side, and the light from the view side is reflected thereon, and the reflected light passes through the opposite direction. The colored pattern of the color filter layer can display the desired text or image in color. Next, the materials and components used in the multicolor display panel of the present invention will be further described. The microcapsules (5) used in forming the color filter with microcapsules are composed of colored particles (6), white particles (7), a transparent dispersion medium (8), and a microcapsule shell (9). In general, the microcapsules used in the microcapsule-type electrophoretic display panel are refined by a sieving method or a specific gravity separation method, and the average particle diameter is 30 ΙΟΟμιη, and, in addition, with respect to the average particle diameter of the capsule, there are 1 0 μm τι The proportion of the microcapsules having a particle diameter within at least exceeds 50%. The microcapsules used in the multicolor display panel of the present invention are adjusted to the aforementioned particle size distribution in the microcapsule layer. The microcapsule dispersion uses an aqueous solvent such as an alcohol, and if there is no particular problem, water is used. The dispersion medium (8) is selected from an insulating liquid in which charged particles are excellent and stably charged, that is, an organic solvent which is substantially insoluble in water. For example, a long-chain alcohol solvent such as lauryl alcohol or undecyl alcohol, a polycarbone such as dibutyl ketone or methyl isobutyl ketone, or an aliphatic hydrocarbon such as pentane, hexane or octane may be mentioned. Alicyclic hydrocarbons such as hexane and methylcyclohexane, benzene, toluene, xylene, hexylbenzene, butylbenzene, octylbenzene, mercaptobenzene, mercaptobenzene,--院-13- 201237526 base benzene, ten An aromatic hydrocarbon such as a benzene group having a long-chain alkyl group such as a dialkylbenzene, a tridecylbenzene or a tetradecylbenzene, or a methylene chloride such as chloroform, carbon tetrachloride or 1,2-dichloroethane. A hydrocarbon or a single component of various oils such as eucalyptus oil or olive oil or a mixture thereof. In the black electrophoretic particles of the colored particles (6), in addition to black pigments such as aniline black and carbon black, fine powders such as glass or resin, and composites thereof may be used. Further, in the multicolor display panel of the present invention which performs multicolor display by a color filter, black particles using carbon black are generally used. Further, as the white electrophoretic particles of the white particles (7), known organic compounds such as a white inorganic pigment such as titanium oxide, ceria, alumina or zinc oxide, and a vinyl acetate emulsion, and a composite thereof are used. Further, the colored particles (6) and the white particles (7) may be treated with various surfactants, dispersants, organic and inorganic compounds, metals, and the like as needed, so that not only the desired surface charge but also the surface charge can be imparted. Dispersion stability in the transparent dispersion medium (8). The dispersion A in which the colored particles (6) and the white particles (7) are dispersed in the transparent dispersion medium (8) is subjected to a phase separation method such as a hybrid coacervation method, a surface polymerization method, an in-situ polymerization method, and a dissolution dispersion. A known method such as a cooling method is enclosed in the microcapsules. The shell (9) of the microcapsule is, for example, a film of rubber or gelatin. As a material for forming the microcapsules, a material that sufficiently transmits light is preferable, and specific examples thereof include urea-formaldehyde resin, melamine-formaldehyde resin, polyester resin, urethane resin, polyethylene resin, polystyrene resin, and polyamide resin. , C-14-201237526 acrylate resin, methacrylate resin, vinyl acetate resin, rubber, gelatin, etc. They may be used alone or in combination of two or more. The microcapsule ink is blended in a microcapsule dispersion in which the refined particle size distribution is dispersed, by mixing a thickener, a surfactant, and a binder resin (1 1 ). In the binder resin (11) of the microcapsule ink, a dielectric resin such as polylactic acid, awake resin, polypropylene resin, acrylic resin, or urethane resin is used. Further, when two or more types of microcapsule inks are blended, when they are mixed, the density of the mixed inks is adjusted to be equal in order to prevent a change in ink density after mixing. The microcapsule layer (10) is formed as follows: the microcapsule ink is directly coated on the transparent electrode layer (4) of the transparent substrate (1) as described above, and the transparent substrate (1) is composed of a glass substrate or a resin substrate. And a color filter layer (2) and a transparent electrode layer (4) are provided in advance. The coating is carried out by a coating device such as a screen printing method, a micro gravure coater, a contact roll coater, a comma coater, a slit coater, a wire bar coater, a curtain coater, etc., and can be preferably used in the present invention. Slot die coater. Since the microcapsule layer (10) formed as described above has irregularities on the surface, it is difficult to make the distance between the electrodes sandwiching the microcapsules constant. Therefore, a surface smoothing ink can be applied on the microcapsule layer (10) to form a surface smoothing layer. By forming the surface smoothing layer, the bonding agent can be directly coated on the surface smoothing layer. This can avoid the problem that if there is no surface smoothing layer, the adhesive is directly applied, and the microcapsule layer (10) has an uncoated position such as a pinhole, the adhesive directly contacts the transparent electrode layer on the side of the color filter ( 4), -15- 201237526 The dielectric constant changes, it is difficult to apply a voltage on the microcapsules, and the display is not clear. The surface smoothing ink is formed by dispersing a resin as a binder in a solvent. The binder component is preferably a resin having the same dielectric constant as that of the binder component used in the microcapsule ink or the binder component used in the binder layer. In particular, the optimum composition of the binder resin used in the microcapsule ink and the adhesive layer is the same as that of the surface smoothing ink. When a resin having a different dielectric constant is used, a resin having a different dielectric constant is laminated between the electrodes, and the thickness of each resin is different depending on the size of the microcapsules present in the portion. If this is the case, the voltage applied to the microcapsules is difficult to maintain uniformity over the entire screen area due to the difference in dielectric constant of each resin. As the solvent of the surface smoothing ink, a solvent used in the microcapsule ink may be used, or an aqueous solvent such as another alcohol may be used. Surface smoothing The ink is applied using a coating device such as a curtain coater or a slit coater. The coating method of cutting the coating liquid such as doctor blade coating cannot be used because the microcapsules in the microcapsule layer are broken. The thickness of the surface smoothing layer is preferably from 1 〇 to 30 μm. When it is below ΙΟμηη, the microcapsules are not smooth due to the unevenness of the surface. On the other hand, when the distance is more than 30 μm, the distance between the electrodes is wide, which causes the driving voltage to rise. The surface smoothing layer is formed as above to sufficiently evaporate the solvent to form a microcapsule-containing color filter. The color filter with microcapsules and the back electrode plate on which the pixel electrode is disposed on the back substrate are bonded and laminated, thereby completing the electrophoretic multicolor display panel of the present invention, in which the adhesive layer is passed through - 16 * 201237526 The color pattern (pixel) of the color filter and the pixel electrode position of the back electrode are overlapped. The material which can be used as the binder is preferably a synthetic resin binder such as a polyurethane binder or an acrylic binder. It is especially good to use a high dielectric resin binder. The bonding agent may be directly applied to the microcapsule layer or the pixel electrode. In the manufacturing method of the present invention, it is preferably coated on the Plexiglas substrate on which the conductive layer is formed between the ruthenium film and the resin substrate. A binder of the same composition as the binder resin used in the microcapsule ink is suitably used as a binder sheet. By using a binder having the same composition as the binder resin used in the microcapsule ink, there are the advantages that the affinity with the resin interface is improved, peeling does not occur, and since the dielectric constant is similar, it is applied to the microcapsules. The voltage on it is easy to maintain a certain amount in the plane. Further, by peeling the substrate with a resin in which a conductive layer is formed between the ruthenium film and the resin substrate, driving evaluation and quality confirmation of the front panel of the so-called color filter electrophoretic display system are performed. The front panel of the color filter electrophoretic display method is a multilayer substrate formed by laminating and laminating the above-mentioned adhesive sheet on a color filter with microcapsules. Further, since the conductive layer herein does not require transparency, it may be a film formed by vapor deposition, electrodeposition of copper, aluminum or the like, and a film formed by coating a conductive polymer. [Examples] Hereinafter, specific examples of the invention will be described. <Example 1 > -17- 201237526 A titanium oxide powder (white particles) having an average particle diameter of 3 μm on the surface and an average particle diameter of 4 μm by surface treatment with alkyltrimethylammonium chloride were covered with a polyethylene resin. The carbon black powder (black particles) was dispersed in a transparent dispersion medium of tetrachloroethylene to obtain a dispersion enthalpy. In this case, the white particles are negatively charged and the black particles are positively charged. Next, the gelatin and sodium polystyrene sulfonate are dissolved in water to prepare an aqueous solution, and the dispersion A is mixed. After the liquid temperature is adjusted to 40 ° C, the liquid temperature is maintained, and the mixture is stirred by a homogenizer to obtain O/W milk. Liquid. Next, the obtained 0/W emulsion and an aqueous solution in which gum arabic was dissolved in water were mixed at 4 (TC) using a disperser, while maintaining the liquid temperature at 4 ° C, acetic acid was used to adjust the pH of the solution to 4. Forming microcapsules containing gelatin-araden gum as a shell material by a complex coacervation method. Then, after the liquid temperature is lowered to 5 ° C, a 37 mass% formalin solution is added to solidify the wall material of the microcapsule shell to obtain a seal. The microcapsules of the dispersion liquid A of the white particles (titanium oxide particles) and the black particles (carbon black particles) are dispersed. The microcapsules thus obtained are sieved to have the same particle size so that the average particle diameter is 40 μm, and 30~ The ratio of the microcapsules having a particle diameter of 50 μm is 50% or more. Next, the microcapsules having the same particle diameter are used as a solid component, and an aqueous dispersion of microcapsules having a solid content of 40% by mass is adjusted. A urethane-based binder (CP-7 05 0, manufactured by DIC Corporation) containing a component of 25% by mass, a surfactant, a thickener, and pure water were mixed to produce a microcapsule ink. -18- 201237526 On the other hand, the following method was used. A color filter was produced. The parts herein were all parts by mass. First, 50 parts of butyl methacrylate, 20 parts of methyl methacrylate, and 30 parts of acrylic acid were copolymerized with cyclohexanone as a solvent to prepare an acrylic resin. An acrylic resin solution was prepared in an amount of 47 parts by weight of the acrylic resin, and 20 parts of a red pigment (Pigment Red 22) was mixed therein, and dispersed by bead milling for 1 hour. Thereafter, it was mixed by a disperser as a photosensitive property. Red photoinhibition was prepared by using 4 parts of dipentaerythritol, 4 parts of hexaacrylate, and 0.3 parts of bis(2,4,6-trimethylbenzylidene)-phenylphosphine oxide as a photopolymerization initiator. The red photoresist material was spin-coated on a transparent glass substrate having a length of 400 mm x 320 mm and a thickness of 0.7 mm, and allowed to stand at room temperature for 5 minutes to smooth the surface of the film, and then dried at 70 ° C for 20 minutes. A red photoresist layer is formed.
然後，在該紅色光致抗鈾層上如第4(b)圖所示，形成 6面顯示畫面是縱97.28mmx橫128.08mm的6型顯示面 板，如第 4(a)圖所示，將對應於子像素尺寸爲 151μίηχ153μιη、由 RGBW 構成的像素尺寸是 3 0 2 μιηχ 3 06 μιη 的像素長寬的圖案的光掩模設置在紅色曝光的位置，通過 超高壓水銀燈，以曝光量1 50m】/cm2的條件密合曝光。曝 光後，以lKg/cm2的噴出壓力噴出霧狀的溫度2(TC的1% 碳酸鈉水溶液，進行20秒鐘噴霧顯影，除去未曝光部位， 露出玻璃基板。將顯影處理後的玻璃基板乾燥後，在23(TC -19- 201237526 下加熱1小時，進行固膜處理，得到膜厚1 · 1 μ m的紅色圖 案。 接著，在形成該紅色圖案的玻璃基板上，使用綠色顏 料（PigmentGreen7)作爲顏色材料，以和前述紅色光致抗触 劑同樣的成分製造綠色光致抗蝕材料，使用該材料形成綠 色光致抗蝕層。然後，將與前述同樣的光掩模移動設置在 形成綠色圖案的位置上，以曝光量爲200m J/cm2的條件密 合曝光。曝光後，以lKg/cm2的噴出壓力噴出霧狀的溫度 爲2 0°C的1 %碳酸鈉水溶液，進行30秒鐘噴霧顯影，除去 未曝光部位，露出玻璃基板。將顯影處理後的玻璃基板乾 燥後，和前述同樣地在23 0°C下加熱1小時，進行固膜處 理，得到膜厚爲1.2 μηι的綠色圖案。 然後，和前述同樣地，使用藍色顏料（Pigment Blue 15:6) 作爲顏色材料，使用藍色光致抗鈾材料形成藍色光致抗蝕 層。然後，將和前述同樣的光掩膜移動設置在形成藍色圖 案的位置上，密合曝光、進行顯影，除去未曝光的部位、 露出玻璃基板。將顯影處理後的玻璃基板乾燥後，和前述 同樣地，在23 0°C下加熱1小時進行固膜處理，得到膜厚 爲1 . 1 μηι的藍色圖案。 接著，使用只除去著色顏料的感光性丙烯酸樹脂，進 行和上述同樣的操作，得到膜厚爲1 . 1 μηι的W(透明）圖案。 RGBW各個子像素和鄰接的各像素之間沒有重疊，而且以 底部邊緣接觸的形式形成，即使是分開的情況下，最大分 -20- 201237526 開在Ι.Ομπι以下。另外，頂部邊緣都離開像素邊界在3.3μηι &內°另外’各像素間以及像素內的級差（膜厚差）最大是 0.1 5 μηι。 像這樣’得到下述基板：在玻璃基板上形成6面顯示 畫面縱97.28 mm X橫128.08 mm的6型面板，形成具有子像 素大小爲 15ΐμηιχΐ53μηι、由 RGBW構成的像素大小是 3 02μιη>< 306μηι的圖案的彩色濾光片層。接著，不進行硏磨 處理’在該彩色濾光片層和露出的玻璃基板的整面上，通 過濺鍍法形成厚度150nm的由ΙΤΟ形成的透明電極層。 接著’使用縫模塗布機，將前述微膠囊油墨直接塗布 到形成前述彩色濾光片層的透明玻璃基板上的透明電極層 上。塗布是通過擠壓模具形成爲微膠囊層的厚度是40μιη， 微膠囊之間沒有重合，粒徑大的微膠囊壓入微膠囊層的狀 態進行的。塗布後，在60°C下乾燥1 〇分鐘，得到帶微膠 囊的彩色濾光片。 然後，在上述的帶微膠囊的彩色濾光片的微膠囊層 上，使用縫模塗布機，重疊塗布作爲表面平滑化用油墨的 固體成分25質量％的聚胺基甲酸酯類黏結劑（CP-7050，DIC 股份有限公司製造），進行乾燥，得到帶有表面平滑層的帶 微膠囊彩色濾光片。 另外，在一面上蒸鍍100nm厚的鋁作爲導電層，然後’ 在其上設置了矽類剝離塗層的50Km厚的聚對苯二甲酸乙 二酯片的剝離塗布面側’塗布25μιη厚的聚酯-聚氨酯類黏 -21- 201237526 結劑，調節黏結劑片。 接著，在上述帶表面平滑層的帶微膠囊的彩色濾光片 上，貼合上述黏結片，得到帶有6面6型顯示畫面的彩色 濾光片電泳顯示方式前面板。在該狀態下，在透明電極層 和導電層上施加電壓，進行微膠囊層的運行確認。 接著，對該彩色濾光片電泳顯示方式前面板，留下聚 酯-聚氨酯類黏結劑的黏結劑層，將設置了矽類剝離塗層的 5 Ομηι厚的聚對苯二甲酸乙二酯片剝離，在彩色濾光片的定 位標記上重合，在對應於彩色濾光片的6型的帶有6面的 背面電極板的像素電極面，以0.5 0ΜΡ的壓力貼合，然後， 將6面的顯示畫面分別成片，得到作爲本發明的帶彩色濾 光片的微膠囊型電泳顯示面板的多色顯示面板。該背面電 極板在作爲TFT基板的玻璃基板上具有由IT Ο構成的像素 電極，該IT Ο爲使用薄膜電晶體形成的有源矩陣型驅動方 式的電路結構的ITO。 在製造的實施例1的各顯示面板上，由標準電壓電流 產生裝置（橫河電機股份有限公司製造），在前面的透明電 極和背面的像素電極間施加約± 1 5 V的電壓，評價實際顯示 性質。另外，使用色彩色差計CR-400(KonicaMinolta公司 製造），測定彩色顯示時（白色顯示時）和黑色顯示時的反射 率，以對比度=彩色時（白色時）反射率/黑色時的反射率評價 對比度。此外，通過相同裝置測定視覺亮度L*。 結果是，實施例1的顯示面板是6個顯示面板的亮度 -22- 201237526 都高，在相同對比度下可以實現多色顯示。沒有檢測出微 膠囊油墨的塗布不均引起的圖像不均或6個面板間的顏色 濃度不同。此外，任一個顯示面板在正面和橫向觀察時都 沒有顏色不勻，還可以進行改善了視覺角度導致的顏色視 差的優異的顏色顯示。 【圖式簡單說明】 第1圖通過剖面說明本發明的多色顯示面板的一個實 施形態的結構簡圖。 第2圖通過放大的剖面說明本發明的多色顯示面板的 一個實施形態的結構的示意圖。 第3圖說明構成本發明的多色顯示面板的彩色濾光片 的一個例子的剖面放大示意圖。 第4圖構成本發明的多色顯示面板的彩色濾光片的一 個實施例的放大平面說明圖。 【主要元件符號說明】 1 透明基板 2 (RGB)彩色濾光片層 4 透明電極層 5 微膠囊 6 著色粒子 7 白色粒子 8 透明分散介質 9 微膠囊殻 -23- 201237526 10 微 膠 囊 層 11 黏 結 劑 樹脂 16 黏 結 劑 層 30 像 素 電 極 50 背 面 基 材 -24Then, as shown in FIG. 4(b), on the red photo-induced uranium layer, a 6-type display panel having a 6-side display screen of 97.28 mm x 128.08 mm in length is formed, as shown in FIG. 4(a), A photomask corresponding to a pattern of a pixel length and width of a pixel size of 151 μίη 153 μιη, which is composed of RGBW, is set at a red exposure position, and is passed through an ultrahigh pressure mercury lamp at an exposure amount of 1 50 m. The condition of /cm2 is close to exposure. After the exposure, a mist-like temperature 2 (1% sodium carbonate aqueous solution of TC was sprayed at a discharge pressure of 1 kg/cm 2 , and spray development was performed for 20 seconds to remove the unexposed portion, thereby exposing the glass substrate. After drying the developed glass substrate The film was heated at 23 (TC -19-201237526 for 1 hour, and subjected to solid-state treatment to obtain a red pattern having a film thickness of 1 · 1 μm. Next, a green pigment (Pigment Green 7) was used as a glass substrate on which the red pattern was formed. a color material, a green photoresist material is produced by the same composition as the aforementioned red photo-anti-contact agent, and a green photoresist layer is formed using the material. Then, the same photomask as described above is moved to form a green pattern. At the position of the exposure, the exposure was carried out under the conditions of an exposure amount of 200 m J/cm 2 . After the exposure, a mist of a 1% sodium carbonate aqueous solution having a temperature of 20 ° C was sprayed at a discharge pressure of 1 kg/cm 2 for 30 seconds. After development, the unexposed portion was removed to expose the glass substrate. After the glass substrate after the development treatment was dried, the film was heated at 23 ° C for 1 hour in the same manner as above to carry out a solid film treatment to obtain a film thickness of 1.2 μ. Then, a blue pigment (Pigment Blue 15:6) is used as a color material, and a blue photoresist layer is used to form a blue photoresist layer. Then, the same light as above is formed. The mask is moved at a position where the blue pattern is formed, and is exposed to light and developed, and the unexposed portion is removed to expose the glass substrate. After the developed glass substrate is dried, the film is dried at 23 ° C in the same manner as described above. The film was subjected to a solid film treatment for 1 hour to obtain a blue pattern having a film thickness of 1.1 μm. Next, a photosensitive acrylic resin containing only the coloring pigment was removed, and a film thickness of 1. 1 μηι was obtained by the same operation as described above. W (transparent) pattern. There is no overlap between each sub-pixel of RGBW and each adjacent pixel, and it is formed in the form of contact at the bottom edge. Even in the case of separation, the maximum score -20-201237526 is below Ι.Ομπι. In addition, the top edge is away from the pixel boundary in 3.3μηι &°°, and the difference between the pixels and the pixel (difference in film thickness) is 0.1 5 μηι max. 'The following substrate was obtained: a 6-type panel having a vertical display of 97.28 mm X and a width of 128.08 mm on a glass substrate was formed on the glass substrate, and a pattern having a sub-pixel size of 15 ΐμηιχΐ53 μηι and a pixel size of RGBW of 3 02 μηη>< 306 μη was formed. Then, the color filter layer is not subjected to honing treatment. On the entire surface of the color filter layer and the exposed glass substrate, a transparent electrode layer made of tantalum having a thickness of 150 nm is formed by sputtering. The aforementioned microcapsule ink was directly applied onto the transparent electrode layer on the transparent glass substrate on which the color filter layer was formed, using a slit die coater. The coating was carried out by extruding a mold so that the thickness of the microcapsule layer was 40 μm, the microcapsules did not overlap, and the microcapsules having a large particle diameter were pressed into the microcapsule layer. After coating, it was dried at 60 ° C for 1 , to obtain a color filter with microcapsules. Then, on the microcapsule layer of the above-described microcapsule-containing color filter, a polyurethane-based adhesive (CP) having a solid content of 25% by mass as a surface smoothing ink was superposed and applied using a slit die coater. -7050, manufactured by DIC Corporation, and dried to obtain a microcapsule color filter with a smooth surface layer. In addition, 100 nm thick aluminum was vapor-deposited on one side as a conductive layer, and then the peel-coated side of the 50-m thick polyethylene terephthalate sheet on which the bismuth-based release coating was provided was coated with a thickness of 25 μm. Polyester-Polyurethane Viscose-21- 201237526 Additive, adjust the adhesive sheet. Next, the above-mentioned bonded sheet was bonded to the color filter with microcapsules having the surface smoothing layer to obtain a color filter electrophoretic display type front panel having a six-sided 6-type display screen. In this state, a voltage is applied to the transparent electrode layer and the conductive layer to confirm the operation of the microcapsule layer. Next, the color filter electrophoretic display front panel is left with a polyester-polyurethane-based adhesive layer, and a 5 Ομη thick polyethylene terephthalate sheet provided with a bismuth-based release coating is provided. Peeling, superimposed on the positioning marks of the color filter, and bonding on the pixel electrode surface of the 6-type back electrode plate of the type 6 corresponding to the color filter at a pressure of 0.5 ΜΡ, and then, 6 sides The display screens are each sliced to obtain a multi-color display panel as a microcapsule-type electrophoretic display panel with a color filter of the present invention. This back electrode plate has a pixel electrode made of IT 在 on a glass substrate as a TFT substrate, and this IT ITO is an ITO of an active matrix type driving circuit structure formed using a thin film transistor. On each of the display panels of the first embodiment manufactured, a voltage of about ± 15 V was applied between the front transparent electrode and the pixel electrode on the back side by a standard voltage current generating device (manufactured by Yokogawa Electric Co., Ltd.), and the actual value was evaluated. Display properties. In addition, the color difference meter CR-400 (manufactured by Konica Minolta Co., Ltd.) was used to measure the reflectance at the time of color display (in the case of white display) and black display, and the reflectance at the time of contrast = color (white) and reflectance at black. Contrast. Further, the visual brightness L* was measured by the same device. As a result, the display panel of the first embodiment has a brightness of -22-201237526 for all six display panels, and multi-color display can be realized under the same contrast. Image unevenness due to uneven coating of the microcapsule ink or color density between the six panels was not detected. Further, any of the display panels has no color unevenness when viewed from the front and the lateral direction, and an excellent color display which improves the color parallax caused by the visual angle can be performed. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing a schematic configuration of an embodiment of a multicolor display panel of the present invention. Fig. 2 is a schematic view showing the configuration of an embodiment of the multicolor display panel of the present invention by an enlarged cross section. Fig. 3 is a cross-sectional enlarged view showing an example of a color filter constituting the multicolor display panel of the present invention. Fig. 4 is an enlarged plan explanatory view showing an embodiment of a color filter of the multicolor display panel of the present invention. [Main component symbol description] 1 Transparent substrate 2 (RGB) Color filter layer 4 Transparent electrode layer 5 Microcapsule 6 Colored particles 7 White particles 8 Transparent dispersion medium 9 Microcapsule shell -23- 201237526 10 Microcapsule layer 11 Adhesive Resin 16 Adhesive Layer 30 Pixel Electrode 50 Back Substrate-24