JP6891502B2 - 電気光学装置、電子機器 - Google Patents
電気光学装置、電子機器 Download PDFInfo
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- JP6891502B2 JP6891502B2 JP2017004880A JP2017004880A JP6891502B2 JP 6891502 B2 JP6891502 B2 JP 6891502B2 JP 2017004880 A JP2017004880 A JP 2017004880A JP 2017004880 A JP2017004880 A JP 2017004880A JP 6891502 B2 JP6891502 B2 JP 6891502B2
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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- G02F1/134309—Electrodes characterised by their geometrical arrangement
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- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
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- G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
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- H10D1/042—Manufacture or treatment of capacitors having no potential barriers using deposition processes to form electrode extensions
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- H10D1/60—Capacitors
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- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/67—Thin-film transistors [TFT]
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- H10D30/6715—Thin-film transistors [TFT] having supplementary regions or layers in the thin films or in the insulated bulk substrates for controlling properties of the device characterised by the properties of the source or drain regions, e.g. compositions or sectional shapes characterised by the doping profiles, e.g. having lightly-doped source or drain extensions
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- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
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- H10D30/67—Thin-film transistors [TFT]
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- H10D30/60—Insulated-gate field-effect transistors [IGFET]
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- H10D30/674—Thin-film transistors [TFT] characterised by the active materials
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- H10D30/6745—Polycrystalline or microcrystalline silicon
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- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D86/00—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates
- H10D86/01—Manufacture or treatment
- H10D86/021—Manufacture or treatment of multiple TFTs
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- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D86/00—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates
- H10D86/40—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs
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- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D86/00—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates
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- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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Description
この構成によれば、トレンチの内側に設けられた第1容量電極に対する配線として導電層を利用できることから、配線構造を簡素化できる。
この構成によれば、容量素子の電気容量をさらに大きくすることができる。
この構成によれば、容量素子の電気容量をより大きくすることができる。
この構成によれば、トランジスターの半導体層に入射する光を容量素子によって遮光することができ、トランジスターにおける光リーク電流の発生を抑制して、安定した動作状態が得られる電気光学装置を提供できる。
この方法によれば、トレンチの内側において第1容量電極は導電層と接するように形成されるため、第1容量電極の配線として導電層を利用し配線構造が簡素化された容量素子を有する電気光学装置を製造することができる。
この方法によれば、さらに大きな電気容量を有する容量素子を形成することができる。
この方法によれば、より大きな電気容量を有する容量素子を形成することができる。
本適用例によれば、電気光学装置は画素に印加された画像信号に基づく電位を保持可能な所望の電気容量を有する容量素子を備えているので、優れた表示品質を有し見栄えのよい表示が可能な電子機器を提供することができる。
<電気光学装置>
まず、本実施形態の電気光学装置としての液晶装置の構成について、図1〜図3を参照して説明する。図1は液晶装置の構成を示す概略平面図、図2は図1に示す液晶装置のH−H’線に沿った概略断面図、図3は液晶装置の電気的な構成を示す等価回路図である。
図4に示すように、液晶装置100における画素Pは、例えば平面視で略四角形(略正方形)の開口領域を有する。開口領域は、X方向とY方向とに延在し格子状に設けられた遮光性の非開口領域により囲まれている。
次に、素子基板10におけるTFT30及び保持容量16の構成について、図5〜図7を参照して説明する。図5は素子基板におけるTFT及び保持容量の配置を示す概略平面図である。
半導体層30aの第1ソース・ドレイン領域30sの端部及び第2ソース・ドレイン領域30dの端部と、第1絶縁膜41との間には下地層41aが設けられている。下地層41aは、例えば高温ポリシリコンなどを用いて形成される。下地層41aを形成することにより、半導体層30aの第1ソース・ドレイン領域30sの端部及び第2ソース・ドレイン領域30dの端部が嵩上げされ、コンタクトホール31,32を形成する際に、上記端部がエッチングされて電気的な接続が損なわれることを防止している。
次に、本実施形態の電気光学装置の製造方法の一例として、液晶装置100の製造方法について説明する。液晶装置100の製造方法における特徴部分は、保持容量16の形成方法にあるため、保持容量16及びこれに関連する構成の形成方法について、図8〜図18を参照して説明する。図8は液晶装置の製造方法を示すフローチャート、図9〜図18は液晶装置の製造方法における工程を説明するための図である。なお、図13を除く図9〜図18は、図5のA−A’線に沿った製造過程における素子基板の構造を示す概略断面図、図13は導電層に対するボトル型トレンチの配置を示す概略平面図である。
なお、基材10s上に第1遮光層51やTFT30を形成する工程、走査線3として機能する第3遮光層53を形成する工程などは、公知の方法を適用することができる。また、保持容量16を形成した後の、データ線6として機能する配線層56a、容量線7として機能する配線層57a、画素電極15などの形成方法もまた公知の方法を適用することができる。
(1)積層された第1絶縁層45と第2絶縁層46とに対して異方性エッチングによって形成されたトレンチ45tに保持容量16を形成する場合に比べて、第1絶縁層45を等方性エッチングして幅を拡張したトレンチ45tに保持容量16を形成するので、保持容量16の断面がボトル状となる。したがって、第1容量電極16a、第1容量絶縁膜16b、第2容量電極16cはボトル型トレンチ45tの内側に庇のようにはみ出した第2絶縁層46の表面にも形成されるので、第1容量絶縁膜16bを挟んで対向する容量電極の面積が増える。すなわち、従来よりも大きな電気容量を有する保持容量16を備えた液晶装置100を提供あるいは製造することができる。
次に第2実施形態の液晶装置について、図19及び図20を参照して説明する。図19は第2実施形態の液晶装置の素子基板におけるTFT及び保持容量の配置を示す概略平面図、図20は図19のC−C’線に沿った素子基板の構造を示す概略断面図である。
第2実施形態の液晶装置200は、上記第1実施形態の液晶装置100に対して、保持容量16の構成を異ならせたものである。したがって、上記第1実施形態の液晶装置100と同じ構成には同じ符号を付して詳細な説明は省略する。
<電子機器>
次に、上記各実施形態の液晶装置が適用された電子機器として、投射型表示装置を例に挙げて図21を参照して説明する。図21は電子機器としての投射型表示装置の構成を示す概略図である。
ダイクロイックミラー1105で反射した緑色光(G)は、リレーレンズ1204を経由して液晶ライトバルブ1220に入射する。
ダイクロイックミラー1105を透過した青色光(B)は、3つのリレーレンズ1201,1202,1203と2つの反射ミラー1107,1108とからなる導光系を経由して液晶ライトバルブ1230に入射する。
Claims (7)
- 基板と、
前記基板に積層された絶縁性の第1層と、
画素ごとに前記第1層に設けられたトレンチと、
前記第1層に積層され、平面視で前記トレンチの内側にはみ出すように設けられ、前記トレンチに連通する開口部を有する第2層と、
前記トレンチ及び前記開口部の少なくとも内側に、第1容量電極、第1容量絶縁膜、第2容量電極の順に積層された容量素子と、を有し、
前記第1容量電極、前記第1容量絶縁膜及び前記第2容量電極は、それぞれ前記第2層の前記トレンチの内側にはみ出す部分を覆うと共に、前記トレンチの互いに対向する側面に沿って設けられ、
前記第1層の層厚は、前記第2層の層厚よりも厚く、
前記基板と平行な第1の方向において、前記開口部の幅よりも、前記トレンチの互いに対向する側面のうち一方の側面に沿って設けられた前記第2容量電極と、前記トレンチの互いに対向する側面のうち他方の側面に沿って設けられた前記第2容量電極との間隔のほうが大きい、電気光学装置。 - 前記第2層は、前記トレンチの内側にはみ出す部分において、前記トレンチ側とは反対側の第1面と、前記第1面と交差する第2面と、前記第2面と交差する前記トレンチ側の第3面と、を有し、
前記第1容量電極は、前記第2層の前記第1面、前記第2面及び前記第3面に沿って設けられ、
前記第1容量絶縁膜は、前記第2層の前記第1面、前記第2面及び前記第3面に沿って、前記第1容量電極を覆うように設けられ、
前記第2容量電極は、前記第2層の前記第1面、前記第2面及び前記第3面に沿って、前記第1容量絶縁膜を覆うように設けられる、請求項1に記載の電気光学装置。 - 前記基板と前記第1層との間に、前記第1容量電極に接する導電層を有する、請求項1に記載の電気光学装置。
- 前記容量素子は、前記トレンチ及び前記開口部の少なくとも内側に設けられた、前記第1容量電極、前記第1容量絶縁膜、前記第2容量電極、第2容量絶縁膜、第3容量電極を含む、請求項1または請求項2に記載の電気光学装置。
- 前記第1容量絶縁膜及び前記第2容量絶縁膜のうち少なくとも一方は、高誘電率膜である、請求項4に記載の電気光学装置。
- 前記基板と前記容量素子との間に、画素ごとに設けられたトランジスターを有し、
前記トレンチは平面視で前記トランジスターの半導体層と重なっている、請求項1乃至5のいずれか一項に記載の電気光学装置。 - 請求項1乃至6のいずれか一項に記載の電気光学装置を備えた、電子機器。
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