JP6241859B2 - アクティブマトリクス型表示パネルの製造方法とアクティブマトリクス型表示パネル - Google Patents
アクティブマトリクス型表示パネルの製造方法とアクティブマトリクス型表示パネル Download PDFInfo
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- JP6241859B2 JP6241859B2 JP2016529016A JP2016529016A JP6241859B2 JP 6241859 B2 JP6241859 B2 JP 6241859B2 JP 2016529016 A JP2016529016 A JP 2016529016A JP 2016529016 A JP2016529016 A JP 2016529016A JP 6241859 B2 JP6241859 B2 JP 6241859B2
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- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
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- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
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- H01L29/78693—Thin film transistors, i.e. transistors with a channel being at least partly a thin film having a semiconductor body comprising an oxide semiconductor material, e.g. zinc oxide, copper aluminium oxide, cadmium stannate the semiconducting oxide being amorphous
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- H10K59/127—Active-matrix OLED [AMOLED] displays comprising two substrates, e.g. display comprising OLED array and TFT driving circuitry on different substrates
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- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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Description
本発明者等は、図14の二点鎖線で囲んだ部分に示すような問題、即ち、TFT層における上部電極908とアノード電極911との間に金属酸化膜922が介挿し、これにより上部電極908とアノード911とのコンタクト不良が生じるメカニズムを次のように解明した。
本発明の一態様に係るアクティブマトリクス型表示パネルの製造方法は、 (i)基板上にTFT層を形成する工程と、(ii)TFT層上に平坦化層を形成する工程と、(iii)平坦化層上に表示素子部を形成する工程と、
を備える。
[数1] 70%×T0≦T1≦150%×T0
上記[数1]の関係を満たすように時間T1を規定することにより、コンタクト孔内での水滴の残存を防ぎ、上部電極等の表面の酸化を防ぎながら、上部電極等と下部電極との間に介挿されることになるフッ素を含む膜の膜厚を制限して、TFT層の上部電極等と表示素子部の下部電極との良好なコンタクトを確保することができる。
1.表示パネル10およびこれを含む表示装置1の製造方法
本発明の実施の形態に係る表示パネル10およびこれを含む表示装置1の製造方法について、図面を用い説明する。なお、以下では、表示パネル10の製造方法について、(1)TFT層の形成工程、(2)平坦化層の形成工程、(3)表示素子部の形成工程に便宜的に分けて説明を行う。
(1)TFT層の形成工程
先ず、TFT層の形成工程について、図1の(a)部〜(e)部、図2の(a)部〜(d)部、および図3の(a)部を用い説明する。
(2)平坦化層の形成工程
次に、平坦化層の形成、および平坦化層へのコンタクト孔開設について、図3の(b)部〜(c)部、および図4の(a)部〜(b)部を用い説明する。
(3)表示素子部の形成
次に、平坦化層110上への表示素子部の形成について、図4の(c)部、図5の(a)部〜(c)部、および図6(a)を用い説明する。
(4)表示装置1の形成
次に、図6(b)に示すように、上記のような過程を経て完成した表示パネル10に対して、駆動・制御回路部20を接続することで表示装置1が完成する。駆動・制御回路部20は、一例として、4つの駆動回路21〜24と、1つの制御回路25とから構成されている。ただし、駆動・制御回路部20の構成については、これに限られるものではない。例えば、駆動回路については、2つであってもよいし、また、表示パネル10に対する配置形態についても、表示パネル10の外周2辺に沿って、4つの駆動回路あるいは2つの駆動回路が配置されていてもよく、さらには、外周1辺に沿って全ての駆動回路が配置されていてもよい。
2.各部の構成材料
(1)基板100,119
基板100,119の構成材料としては、例えば、ガラス基板、石英基板、シリコン基板、硫化モリブデン、銅、亜鉛、アルミニウム、ステンレス、マグネシウム、鉄、ニッケル、金、銀などの金属基板、ガリウム砒素基などの半導体基板、プラスチック基板等を採用することができる。
ゲート電極101の構成材料としては、例えば、銅(Cu)を含み構成されている。例えば、銅(Cu)からなる層とモリブデン(Mo)からなる層との積層体を採用することができる。
ゲート絶縁層102の構成としては、例えば、酸化シリコン(SiO)と窒化シリコン(SiN)との積層体を採用することができる。ただし、ゲート絶縁層102の構成は、これに限定されるものではなく、 ゲート絶縁層102の構成材料としては、例えば、電気絶縁性を有する材料であれば、公知の有機材料や無機材料のいずれも用いることができる。
チャネル層103の構成としては、アモルファス酸化インジウムガリウム亜鉛(IGZO)からなる層を採用することができる。チャネル層103の構成材料は、これに限定されるものではなく、インジウム(In)、ガリウム(Ga)、亜鉛(Zn)から選択される少なくとも一種を含む酸化物半導体を採用することができる。
チャネル保護層104の構成としては、酸化シリコン(SiO)からなる層を採用することができる。ただし、チャネル保護層104の構成材料は、これに限定されるものではなく、例えば、酸窒化シリコン(SiON)、窒化シリコン(SiN)、あるいは酸化アルミニウム(AlOx)を用いることができる。また、上記のような材料を用いた層を複数積層することで構成することもできる。
ソース電極105およびドレイン電極106の構成としては、銅マンガン(CuMn)とモリブデン(Mo)との積層体を採用することができる。
層間絶縁層107の構成としては、酸化シリコン(SiO)からなる層を採用することができる。
上部電極108の構成としては、ソース電極105およびドレイン電極106などと同様に、銅マンガン(CuMn)とモリブデン(Mo)との積層体を採用することができる。ここで、上部電極108においては、Cuからなる層がZ軸方向上部となる構成となっている。
パッシベーション層109の構成としては、窒化シリコン(SiN)からなる層を採用することができる。
平坦化層110の構成は、ポリイミドからなる層を採用することができる。ただし、ポリイミドからなる層以外にも、ポリアミド、アクリル系樹脂材料などの有機化合物からなる層を採用することもできる。
アノード111は、銀(Ag)またはアルミニウム(Al)を含む金属材料から構成されている。トップエミッション型の本実施の形態に係る表示パネル10の場合には、その表面部が高い反射性を有することが好ましい。
バンク112は、樹脂等の有機材料を用い形成されており絶縁性を有する。バンク112の形成に用いる有機材料の例としては、アクリル系樹脂、ポリイミド系樹脂、ノボラック型フェノール樹脂等があげられる。バンク112は、有機溶剤耐性を有することが好ましい。さらに、バンク112は、製造工程中において、エッチング処理、ベーク処理など施されることがあるので、それらの処理に対して過度に変形、変質などをしないような耐性の高い材料で形成されることが好ましい。また、表面に撥水性をもたせるために、表面をフッ素処理することもできる。
有機発光機能層113における有機発光層としては、ホールと電子とが注入され再結合されることにより励起状態が生成され発光する機能を有する。有機発光層の形成に用いる材料は、湿式印刷法を用い成膜できる発光性の有機材料を用いることが必要である。
カソード114は、例えば、酸化インジウムスズ(ITO)若しくは酸化インジウム亜鉛(IZO)などを用い形成される。本実施の形態のように、トップエミッション型の本実施の形態に係る表示パネル10の場合においては、光透過性の材料で形成されることが必要となる。光透過性については、透過率が80[%]以上とすることが好ましい。
封止層115は、有機発光層などの有機層が水分に晒されたり、空気に晒されたりすることを抑制する機能を有し、例えば、窒化シリコン(SiN)、酸窒化シリコン(SiON)などの材料を用い形成される。また、窒化シリコン(SiN)、酸窒化シリコン(SiON)などの材料を用い形成された層の上に、アクリル樹脂、シリコーン樹脂などの樹脂材料からなる封止樹脂層を設けてもよい。
カラーフィルタ層117としては、赤色(R)、緑色(G)、青色(B)の各色の波長域の可視光を選択的に透過する、公知の材料から構成される。例えば、アクリル樹脂をベースに形成されている。
ブラックマトリクス層118は、例えば、光吸収性および遮光性に優れる黒色顔料を含む紫外線硬化樹脂材料から構成されている。具体的な紫外線硬化樹脂材料としては、例えば、アクリル樹脂等がある。
3.コンタクト孔110a,109aの開設
次に、上記のような製造過程の内、平坦化層110およびパッシベーション層109へのコンタクト孔110a,109aの開設工程について、図7から図9を用い詳細説明を行う。
図7の(a)部に示すように、表示パネル10の製造過程において、層間絶縁層107、上部電極108、パッシベーション層1090、および平坦化層1100をZ軸方向下側から順に積層形成する。このとき、本実施例では、パッシベーション層1090の層厚を100[nm]とし、平坦化層1100の層厚を4.5[μm]としている。
Pressure=15〜50[mTorr](例えば、30[mTorr])
Source,Bias=3000[W]
なお、上記条件中におけるガス流量の単位(sccm)については、温度0[℃]で1013[hPa](1[atm])での値である。
例えば、時間T0が35[sec.]と仮定した場合には、時間T1を24.5[sec.]以上87.5[sec.]以下とすることができる。
一方、図9の(a)部に示すように、層間絶縁層807および上部電極808が順に積層され、その上に積層されたパッシベーション層8091および平坦化層810にコンタクト孔810a,8091aを開設する。比較例においても、平坦化層810へのコンタクト孔810aの開設にはリソグラフィを用い、パッシベーション層8091へのコンタクト孔8091aの開設にはドライエッチングを用いる。
上記実施例に係る製造方法を用いてコンタクト孔を開設した場合と、比較例に係る製造方法を用いてコンタクト孔を開設した場合とについて、コンタクト孔を臨む周囲の状態を説明する。
上記実施例に係る製造方法を用いコンタクト孔を開設した場合には、図10(a)に示すように、コンタクト孔の底に露出する上部電極108の表面108cには金属酸化膜が被覆されていることはない。図10(b)に示すように、断面を見ても、コンタクト孔110a,109aの底には、上部電極108の表面108cが露出し、金属酸化膜の被覆はない。
一方、図10(c)に示すように、比較例に係る製造方法を用いコンタクト孔を開設した場合には、コンタクト孔の底に露出する上部電極808の表面808bの一部(コンタクト孔の内縁に近い部分)の上に金属酸化膜(CuOX膜)が形成されている。図10(d)に示すように、断面を見ても、コンタクト孔の底には、上部電極808の表面808bの一部を被覆するように金属酸化膜(CuOX膜)822が形成されている。
4.上部電極108の表面のフッ化膜121による被覆
上記のように、上記実施の形態に係る製造方法では、コンタクト孔109aの開設工程において、オーバーエッチングを実行することで、上部電極108の表面もフッ化膜121で被覆されることになる(図8の二点鎖線で囲んだ部分を参照)。このため、上部電極108とアノード111とのコンタクトの観点から、間に介挿されることになるフッ化膜121について検討した。
変形例に係る表示パネル15の構成について、図13を用い説明する。図13では、表示パネル15の一部構成だけを抜き出して図示している。また、図13においては、上記実施の形態と同じ構成部分には同一の符号を付している。
上記実施の形態および変形例では、SiNからなるパッシベーション層109,159を採用したが、本発明は、これに限定を受けない。フッ素系のガスでドライエッチング可能な材質の層であれば採用することが可能である。そして、複数の層を積層してなるパッシベーション層を採用することもできる。
10、15.表示パネル
20.駆動・制御回路部
21〜24.駆動回路
25.制御回路
100,119.基板
101.ゲート電極
102.ゲート絶縁層
103.チャネル層
104,1040.チャネル保護層
105,155.ソース電極
106.ドレイン電極
107,1070.層間絶縁層
108.上部電極
109,159,1090,1091.パッシベーション層
109a.コンタクト下孔
110,160,1100.平坦化層
110a.コンタクト上孔
111,161.アノード
112.バンク
113.有機発光機能層
114.カソード
115.封止層
116.樹脂層
117.カラーフィルタ層
118.ブラックマトリクス層
120,121.フッ化膜
500.水滴
Claims (8)
- 基板上にTFT層を形成する工程と、
前記TFT層上に平坦化層を形成する工程と、
前記平坦化層上に表示素子部を形成する工程と、
を備え、
前記TFT層を形成する工程には、ソース電極もしくはドレイン電極、またはその一方の電極に接続された接続用電極の何れかの電極を被覆するパッシベーション層を、前記平坦化層と境界を接する状態で形成するサブ工程が含まれ、
前記表示素子部を形成する工程には、前記平坦化層と境界を接する状態で下部電極を形成するサブ工程が含まれ、
前記何れかの電極と前記下部電極との接続は、
底部に前記パッシベーション層の表面が露出するまで、前記平坦化層にコンタクト孔を開設し、
前記平坦化層のコンタクト孔の底部に露出するパッシベーション層に対して、フッ素を含むガスを用いたドライエッチングにより、前記平坦化層のコンタクト孔に連通し、底部に前記何れかの電極が露出するコンタクト孔を開設し、
前記コンタクト孔の底に前記何れかの電極が露出した後、前記パッシベーション層における前記コンタクト孔を臨む内壁面に対し、組成中にフッ素を含む撥液膜を形成し、
前記下部電極を形成するサブ工程で、前記コンタクト孔を臨む前記平坦化層および前記パッシベーション層の内壁面に沿って、前記下部電極を形成する
ことによりなされる
ことを特徴とするアクティブマトリクス型表示パネルの製造方法。 - 前記撥液膜の形成は、前記コンタクト孔の底に前記何れかの電極の表面が露出した後、さらに前記パッシベーション層における前記コンタクト孔を臨む内壁面を前記ガスに晒すことにより行われる
請求項1記載のアクティブマトリクス型表示パネルの製造方法。 - 前記コンタクト孔の開設を開始してから、前記コンタクト孔の底に前記何れかの電極の表面が露出するまでの時間をT0とし、
前記撥液膜の形成のために、前記パッシベーション層における前記コンタクト孔を臨む内壁面を前記ガスに晒す時間をT1とするとき、
70%×T0≦T1≦150%×T0
の関係を満たす
請求項2記載のアクティブマトリクス型表示パネルの製造方法。 - 前記撥液膜の形成後においては、前記コンタクト孔の底に露出する前記何れかの電極の表面に、フッ素を含む電極被膜が形成されてなり、
前記前記撥液膜の形成のために、前記パッシベーション層における前記コンタクト孔を臨む内壁面を前記ガスに晒す時間T1は、前記電極被膜の膜厚が3nm以下となるように規定されている
請求項2記載のアクティブマトリクス型表示パネルの製造方法。 - 前記組成中にフッ素を含む撥液膜の形成後であって、前記下部電極の形成前において、
前記コンタクト孔内を含む前記平坦化層および前記パッシベーション層の表面を水を含む洗浄液で洗浄し、
前記コンタクト孔内を含む前記平坦化層および前記パッシベーション層の表面に対し、エアーまたはガスを吹き付けて、前記コンタクト孔内を含む前記平坦化層および前記パッシベーション層の表面に残る前記洗浄液を除去する
請求項1記載のアクティブマトリクス型表示パネルの製造方法。 - 前記何れかの電極は、銅もしくは銅合金を用い形成されている
請求項1記載のアクティブマトリクス型表示パネルの製造方法。 - 基板上に、TFT層、平坦化層、および表示素子部がこの順に形成されてなるアクティブマトリクス型表示パネルであって、
前記TFT層には、ソース電極もしくはドレイン電極、またはその一方の電極に接続された接続用電極の何れかの電極と、当該何れかの電極を被覆し、前記平坦化層を境界を接するパッシベーション層とが含まれており、
前記表示素子部には、前記平坦化層と境界を接する状態で形成されてなる下部電極が含まれ、
前記下部電極は、前記平坦化層および前記パッシベーション層を連続して貫通するコンタクト孔を通し、前記平坦化層および前記パッシベーション層における前記コンタクト孔を臨む内壁面に沿って一部が形成されることにより、前記コンタクト孔の底で前記何れかの電極に対して電気的に接続されており、
前記平坦化層および前記パッシベーション層における前記コンタクト孔を臨む内壁面と、前記下部電極との間には、フッ素を含む膜が介挿されており、
前記コンタクト孔の底において、前記下部電極と前記何れかの電極との間には、フッ素を含む電極被膜が介挿されている
ことを特徴とするアクティブマトリクス型表示パネル。 - 前記電極被膜の膜厚は、3nm以下である
請求項7記載のアクティブマトリクス型表示パネル。
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