JP6779109B2 - 薄膜トランジスタ基板及びその製造方法、並びに、表示装置 - Google Patents
薄膜トランジスタ基板及びその製造方法、並びに、表示装置 Download PDFInfo
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- JP6779109B2 JP6779109B2 JP2016225657A JP2016225657A JP6779109B2 JP 6779109 B2 JP6779109 B2 JP 6779109B2 JP 2016225657 A JP2016225657 A JP 2016225657A JP 2016225657 A JP2016225657 A JP 2016225657A JP 6779109 B2 JP6779109 B2 JP 6779109B2
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- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—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
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Description
<TFT基板の構成>
まず、図1及び図2を参照して、本発明の実施の形態1に係るTFT基板2001の構成について説明する。なお、本実施の形態1以降の実施の形態で説明する構成要素のうち、本実施の形態1と同じまたは類似する構成要素については同じ参照符号を付し、異なる構成要素について主に説明する。
以下、図4〜図21を用いて本実施の形態1のTFT基板2001の製造方法について説明する。図4、図6、図8、図10、図12、図14、図16、図18及び図20は、本実施の形態1のTFT基板の製造方法を示す平面工程図であり、図5、図7、図9、図11、図13、図15、図17、図19及び図21は、それぞれ平面工程図のX−X’線、Y−Y’線及びZ−Z’線での断面構成を示す断面工程図である。
以上のように構成された本実施の形態1によれば、R着色層51、G着色層61及びB着色層71がいずれも、各々から分離独立していない突起パターン51a,61a,71aを有するので、密着力不良による剥離が生じにくい。またTFT15の上方には1層の着色層ではなく2層からなる着色積層体が遮光層として配設されている。このため、一の遮光層に含まれる二つの着色層のうち、一方の着色層にパターン欠損が発生したとしても他方の着色層でTFT15を覆うことができる。
<TFT基板の構成>
本発明の実施の形態2は、上述した実施の形態1のTFT基板2001において、3色のカラーフィルタ層の形状を変えたものである。図22は、本実施の形態2に係るTFT基板3001の画素表示領域の一部の平面構成を示す平面図であり、図23は、図22におけるX−X’線での断面構成を示す断面図である。なお、以下においては、TFT基板3001は、光透過型のTNモードまたはVAモードのLCDなどの表示装置に備えられるものとし、実施の形態1と同一の部分については、同一符号を付している。
以上のように構成された本実施の形態2によれば、R着色層51、G着色層61及びB着色層71がいずれも、各々から分離独立していない部分突起パターンを有するので、密着力不良による剥離が生じにくい。またTFT15の上方には1層の着色層ではなく3層からなる着色積層体が遮光層として配設されている。このため、一の遮光層に含まれる三つの着色層のうち、一の着色層にパターン欠損が発生したとしても残りの着色層でTFT15を覆うことができる。また、遮光層3050〜3070の高さを、実施の形態1に係る遮光層2050〜2070の高さよりも高くすることができるので、柱状スペーサを形成する際の感光樹脂の塗布膜厚をより薄くすることができ、その結果として、生産性をより高めることができる。
<TFT基板の構成>
本発明の実施の形態3は、図1及び図2に示す実施の形態1のTFT基板2001に、新たに第4の絶縁膜として平坦化絶縁膜を備える点が異なる。なお、この平坦化絶縁膜は、3色の着色層51〜71上に配設され、平坦化された上面を有する樹脂絶縁層である。
以下、図4〜図17に加え、図25〜図28を用いて本実施の形態3のTFT基板4001の製造方法について説明する。なお、図4〜図17は、実施の形態1の製造方法と共通している。図4、図6、図8、図10、図12、図14、図16、図25及び図27は、本実施の形態3のTFT基板の製造方法を示す平面工程図であり、図5、図7、図9、図11、図13、図15、図17、図26及び図28は、それぞれ平面工程図のX−X’線、Y−Y’線及びZ−Z’線での断面構成を示す断面工程図である。また図面において、実施の形態1と同一の部分については、同一符号を付している。
以上のように構成された本実施の形態3によれば、R着色層51、G着色層61及びB着色層71がいずれも、各々から分離独立していない突起パターンを有するので、密着力不良による剥離が生じにくい。またTFT15の上方には1層の着色層ではなく2層からなる着色積層体が遮光層として配設されている。このため、一の遮光層に含まれる二つの着色層のうち、一方の着色層にパターン欠損が発生したとしても他方の着色層でTFT15を覆うことができる。
以上の実施の形態1〜3においては、本発明を縦電界型の光透過型のTNモードもしくはVAモードの液晶表示装置に使用されるTFT基板に適用した例を説明した。これに対し、以下の実施の形態4では、本発明を、横電界型の光透過型のFFS(Fringe Field Switching)モードの液晶表示装置に使用されるTFT基板に適用した例を説明する。
本実施の形態4のFFSモードのTFT基板は、例えば本実施の形態3で示したTFT基板に、さらに第5の絶縁膜である層間絶縁膜と、当該層間絶縁膜上にスリット状の開口部を有する対向電極とが追加された基板である。
上述した実施の形態1〜4においては、液晶を駆動するための走査信号及び表示信号を供給する駆動回路が、TFT基板に外付けされる構成を想定していた。これに対して、高い移動度を有する酸化物半導体をチャネル層に用いるTFT基板においては、以下で説明するように、画素TFTと同様のTFTを含み、画素TFTを駆動する駆動回路が、TFT基板のうちの画素表示領域の周辺部上に配設されてもよい。つまり、駆動回路内蔵型TFT基板であってもよい。このような構成によれば、画素TFTと、TFTを含む駆動回路とを並行して形成することが可能となる。
図32は、駆動回路内蔵型TFT基板である本変形例に係るTFT基板6001の構成の概略を説明する平面図である。図32に示すように、TFT基板6001の上主面は、複数の画素がマトリックス状に配列された画素表示領域である表示領域40と、表示領域40と隣接する額縁領域50とに大きく分けられる。なお、図32には、アライメントマーク89も図示されている。
上述した実施の形態1〜4においては、半導体チャネル層15aの上に、第2の絶縁膜からなるチャネル保護膜107を形成した薄膜トランジスタを示した。しかしこれに限ったものではなく、チャネル保護膜107を形成せずに、半導体チャネル層15aの上に第2の導電膜からなるソース電極8、ドレイン電極11等を直接形成するようにしてもよい。この場合は、チャネル保護膜107を形成する工程を省略することができるので、生産効率を向上させることができる。
Claims (9)
- 基板上に配設された複数のゲート配線と、
前記複数のゲート配線を覆うゲート絶縁膜と、
前記ゲート絶縁膜によって前記複数のゲート配線と絶縁された状態で、平面視にて前記複数のゲート配線と交差する複数のソース配線と、
前記複数のゲート配線と前記複数のソース配線とが交差する複数の交差点にそれぞれ対応させてマトリックス状に配設され、それぞれがチャネル層として酸化物半導体層を有する複数の第1薄膜トランジスタと、
マトリックス状に配設され、前記複数の第1薄膜トランジスタとそれぞれ電気的に接続された複数の画素電極と、
前記複数の画素電極のうちの一方向に隣り合う2以上の画素電極とそれぞれ平面視で重なる複数色の着色層と
を備え、
前記複数色の着色層のうちの少なくとも2色の着色層のそれぞれが有する端部であって平面視で互いに重なる端部を含む着色積層体が、前記第1薄膜トランジスタの前記チャネル層の上部を覆い、
前記複数色の着色層は、赤色着色層、緑色着色層、及び、青色着色層であり、
前記着色積層体の最下層は、前記赤色着色層または前記緑色着色層であり、
前記着色積層体に含まれる前記端部は、
前記複数色の着色層のうちの3色の着色層のそれぞれが有する端部であっていずれもが平面視で重なる端部であり、
前記複数色の着色層は前記一方向に周期的に配設され、
前記3色の着色層は、
第1着色層と、前記第1着色層に対して前記一方向に位置する第2着色層と、前記第2着色層に対して前記一方向に位置する第3着色層とを含み、
前記第1着色層は、前記第1着色層の前記端部として用いられ、前記一方向に突出する第1突起パターンを有し、
前記第2着色層は、前記第2着色層の前記端部として用いられ、前記一方向に突出する第2突起パターンを有し、
前記第2突起パターンは、
第1部分と、
平面視において前記第1部分よりも太い第2部分と
を含み、
前記第1着色層の前記第1突起パターンの一部と、前記第2着色層の前記第2突起パターンの前記第2部分と、前記第3着色層の前記端部とが平面視において重なる、薄膜トランジスタ基板。 - 基板上に配設された複数のゲート配線と、
前記複数のゲート配線を覆うゲート絶縁膜と、
前記ゲート絶縁膜によって前記複数のゲート配線と絶縁された状態で、平面視にて前記複数のゲート配線と交差する複数のソース配線と、
前記複数のゲート配線と前記複数のソース配線とが交差する複数の交差点にそれぞれ対応させてマトリックス状に配設され、それぞれがチャネル層として酸化物半導体層を有する複数の第1薄膜トランジスタと、
マトリックス状に配設され、前記複数の第1薄膜トランジスタとそれぞれ電気的に接続された複数の画素電極と、
前記複数の画素電極のうちの一方向に隣り合う2以上の画素電極とそれぞれ平面視で重なる複数色の着色層と
を備え、
前記複数色の着色層のうちの少なくとも2色の着色層のそれぞれが有する端部であって平面視で互いに重なる端部を含む着色積層体が、前記第1薄膜トランジスタの前記チャネル層の上部を覆い、
前記着色積層体の最下層は、波長400nm以下の光をカットする着色層であり、
前記着色積層体に含まれる前記端部は、
前記複数色の着色層のうちの3色の着色層のそれぞれが有する端部であっていずれもが平面視で重なる端部であり、
前記複数色の着色層は前記一方向に周期的に配設され、
前記3色の着色層は、
第1着色層と、前記第1着色層に対して前記一方向に位置する第2着色層と、前記第2着色層に対して前記一方向に位置する第3着色層とを含み、
前記第1着色層は、前記第1着色層の前記端部として用いられ、前記一方向に突出する第1突起パターンを有し、
前記第2着色層は、前記第2着色層の前記端部として用いられ、前記一方向に突出する第2突起パターンを有し、
前記第2突起パターンは、
第1部分と、
平面視において前記第1部分よりも太い第2部分と
を含み、
前記第1着色層の前記第1突起パターンの一部と、前記第2着色層の前記第2突起パターンの前記第2部分と、前記第3着色層の前記端部とが平面視において重なる、薄膜トランジスタ基板。 - 請求項1または請求項2に記載の薄膜トランジスタ基板であって、
前記着色積層体は、
前記薄膜トランジスタ基板と対向基板とを離間する柱状スペーサの土台として機能する、薄膜トランジスタ基板。 - 請求項1から請求項3のうちのいずれか1項に記載の薄膜トランジスタ基板であって、
前記複数色の着色層上に配設され、平坦化された上面を有する樹脂絶縁層をさらに備え、
前記画素電極は前記樹脂絶縁層の前記上面上に配設されている、薄膜トランジスタ基板。 - 請求項1から請求項4のうちのいずれか1項に記載の薄膜トランジスタ基板であって、
前記基板上に前記複数の第1薄膜トランジスタと離間して配設された第2薄膜トランジスタを含み、前記複数の第1薄膜トランジスタを駆動する駆動回路と、
前記複数色の着色層と離間して配設され、前記複数色の着色層と同じ複数色を有する別の複数色の着色層と
をさらに備え、
前記駆動回路の前記第2薄膜トランジスタは、チャネル層として酸化物半導体層を有し、
前記別の複数色の着色層のうちの少なくとも2色の着色層のそれぞれが有する端部であって平面視で互いに重なる端部を含む別の着色積層体が、前記第2薄膜トランジスタの前記チャネル層を覆う、薄膜トランジスタ基板。 - 請求項1から請求項5のうちのいずれか1項に記載の薄膜トランジスタ基板を備える、表示装置。
- 複数のゲート配線を基板上に形成する工程と、
前記複数のゲート配線を覆うゲート絶縁膜を形成する工程と、
前記複数のゲート配線の一部である複数のゲート電極と平面視にて重なるように、それぞれが複数の第1薄膜トランジスタのチャネル層となる複数の酸化物半導体層を前記ゲート絶縁膜上に形成する工程と、
前記ゲート絶縁膜によって前記複数のゲート配線と絶縁された状態で平面視にて前記複数のゲート配線と交差し、前記複数の酸化物半導体層と複数のソース電極を介して電気的に接続された複数のソース配線を形成する工程と、
マトリックス状に配列され、一方向に隣り合う複数色の着色層を形成する工程と、
前記複数色の着色層とそれぞれ平面視で重なり、前記複数の第1薄膜トランジスタとそれぞれ電気的に接続された複数の画素電極を形成する工程と、
を備え、
前記複数色の着色層のうちの少なくとも2色の着色層のそれぞれが有する端部であって平面視で互いに重なる端部を含む着色積層体が、前記第1薄膜トランジスタの前記チャネル層の上部を覆い、
前記複数色の着色層は、赤色着色層、緑色着色層、及び、青色着色層であり、
前記着色積層体の最下層は、前記赤色着色層または前記緑色着色層であり、
前記着色積層体に含まれる前記端部は、
前記複数色の着色層のうちの3色の着色層のそれぞれが有する端部であっていずれもが平面視で重なる端部であり、
前記複数色の着色層は前記一方向に周期的に配設され、
前記3色の着色層は、
第1着色層と、前記第1着色層に対して前記一方向に位置する第2着色層と、前記第2着色層に対して前記一方向に位置する第3着色層とを含み、
前記第1着色層は、前記第1着色層の前記端部として用いられ、前記一方向に突出する第1突起パターンを有し、
前記第2着色層は、前記第2着色層の前記端部として用いられ、前記一方向に突出する第2突起パターンを有し、
前記第2突起パターンは、
第1部分と、
平面視において前記第1部分よりも太い第2部分と
を含み、
前記第1着色層の前記第1突起パターンの一部と、前記第2着色層の前記第2突起パターンの前記第2部分と、前記第3着色層の前記端部とが平面視において重なる、薄膜トランジスタ基板の製造方法。 - 複数のゲート配線を基板上に形成する工程と、
前記複数のゲート配線を覆うゲート絶縁膜を形成する工程と、
前記複数のゲート配線の一部である複数のゲート電極と平面視にて重なるように、それぞれが複数の第1薄膜トランジスタのチャネル層となる複数の酸化物半導体層を前記ゲート絶縁膜上に形成する工程と、
前記ゲート絶縁膜によって前記複数のゲート配線と絶縁された状態で平面視にて前記複数のゲート配線と交差し、前記複数の酸化物半導体層と複数のソース電極を介して電気的に接続された複数のソース配線を形成する工程と、
マトリックス状に配列され、一方向に隣り合う複数色の着色層を形成する工程と、
前記複数色の着色層とそれぞれ平面視で重なり、前記複数の第1薄膜トランジスタとそれぞれ電気的に接続された複数の画素電極を形成する工程と、
を備え、
前記複数色の着色層のうちの少なくとも2色の着色層のそれぞれが有する端部であって平面視で互いに重なる端部を含む着色積層体が、前記第1薄膜トランジスタの前記チャネル層の上部を覆い、
前記着色積層体の最下層は、波長400nm以下の光をカットする着色層であり、
前記着色積層体に含まれる前記端部は、
前記複数色の着色層のうちの3色の着色層のそれぞれが有する端部であっていずれもが平面視で重なる端部であり、
前記複数色の着色層は前記一方向に周期的に配設され、
前記3色の着色層は、
第1着色層と、前記第1着色層に対して前記一方向に位置する第2着色層と、前記第2着色層に対して前記一方向に位置する第3着色層とを含み、
前記第1着色層は、前記第1着色層の前記端部として用いられ、前記一方向に突出する第1突起パターンを有し、
前記第2着色層は、前記第2着色層の前記端部として用いられ、前記一方向に突出する第2突起パターンを有し、
前記第2突起パターンは、
第1部分と、
平面視において前記第1部分よりも太い第2部分と
を含み、
前記第1着色層の前記第1突起パターンの一部と、前記第2着色層の前記第2突起パターンの前記第2部分と、前記第3着色層の前記端部とが平面視において重なる、薄膜トランジスタ基板の製造方法。 - 請求項7または請求項8に記載の薄膜トランジスタ基板の製造方法であって、
複数色の有色フィルムの貼付、露光及び現像を行うことによって、前記複数色の着色層を形成する、薄膜トランジスタ基板の製造方法。
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