JP2011141522A - 液晶表示装置、及び当該液晶表示装置を具備する電子機器 - Google Patents
液晶表示装置、及び当該液晶表示装置を具備する電子機器 Download PDFInfo
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- JP2011141522A JP2011141522A JP2010229412A JP2010229412A JP2011141522A JP 2011141522 A JP2011141522 A JP 2011141522A JP 2010229412 A JP2010229412 A JP 2010229412A JP 2010229412 A JP2010229412 A JP 2010229412A JP 2011141522 A JP2011141522 A JP 2011141522A
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- layer
- oxide semiconductor
- insulating layer
- liquid crystal
- oxide
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Abstract
【解決手段】表示部に複数の画素を有し、複数のフレーム期間で表示を行う液晶表示装置であって、フレーム期間は、書き込み期間及び保持期間を有し、書き込み期間において、複数の画素のそれぞれに、画像信号を入力した後、保持期間において、複数の画素が有するトランジスタをオフ状態にして、少なくとも30秒間、画像信号を保持させる。画素は、酸化物半導体層でなる半導体層を具備し、酸化物半導体層は、キャリア濃度が1×1014/cm3未満である。
【選択図】図1
Description
薄膜トランジスタを用いて液晶表示装置の画素を構成する例を以下に説明する。本実施の形態では、一例として、液晶表示装置における画素が有する薄膜トランジスタ(以下、TFTともいう)及び当該TFTに接続された画素電極として機能する電極(単に画素電極ともいう)について示し、説明する。なお画素とは、表示装置の各画素に設けられた各素子、例えば薄膜トランジスタ、画素電極として機能する電極、及び配線等の電気的な信号により表示を制御するための素子で構成される素子群、のことをいう。なお画素は、カラーフィルター等を含むものであっても良く、一画素によって、明るさを制御できる色要素一つ分としてもよい。よって、一例として、RGBの色要素からなるカラー表示装置の場合には、画像の最小単位は、Rの画素とGの画素とBの画素との三画素から構成されるものとなり、複数の画素によって画像を得ることができるものとなる。ただし、本発明の一態様は、カラー表示の表示装置に限定されるものではなく、モノクロ表示の表示装置としてもよい。
本実施の形態は、本明細書で開示する液晶表示装置に適用できる薄膜トランジスタの例を示す。本実施の形態で示す薄膜トランジスタ410は、実施の形態1の薄膜トランジスタ106として用いることができる。
本実施の形態は、本明細書で開示する液晶表示装置に適用できる薄膜トランジスタの他の例を示す。なお、実施の形態2と同一部分又は同様な機能を有する部分、及び工程は、実施の形態2と同様とすればよく、その繰り返しの説明は省略する。また同じ箇所の詳細な説明も省略する。本実施の形態で示す薄膜トランジスタ460は、実施の形態1の薄膜トランジスタ106として用いることができる。
本実施の形態は、本明細書で開示する液晶表示装置に適用できる薄膜トランジスタの他の例を示す。なお、実施の形態2と同一部分又は同様な機能を有する部分、及び工程は、実施の形態2と同様とすればよく、その繰り返しの説明は省略する。また同じ箇所の詳細な説明も省略する。本実施の形態で示す薄膜トランジスタ425、426は、実施の形態1の薄膜トランジスタ106として用いることができる。
本実施の形態は、本明細書で開示する液晶表示装置に適用できる薄膜トランジスタの例を示す。
本実施の形態は、本明細書で開示する液晶表示装置に適用できる薄膜トランジスタの他の例を示す。本実施の形態で示す薄膜トランジスタ310は、実施の形態1の薄膜トランジスタ106として用いることができる。
本実施の形態は、本明細書で開示する液晶表示装置に適用できる薄膜トランジスタの他の例を示す。本実施の形態で示す薄膜トランジスタ360は、実施の形態1の薄膜トランジスタ106として用いることができる。
本実施の形態は、本明細書で開示する液晶表示装置に適用できる薄膜トランジスタの他の例を示す。本実施の形態で示す薄膜トランジスタ350は、実施の形態1の薄膜トランジスタ106として用いることができる。
本実施の形態は、本明細書で開示する液晶表示装置に適用できる薄膜トランジスタの他の例を示す。本実施の形態で示す薄膜トランジスタ380は、実施の形態1の薄膜トランジスタ106として用いることができる。
本実施の形態は、本明細書で開示する液晶表示装置に適用できる薄膜トランジスタの他の例を示す。本実施の形態で示す薄膜トランジスタは、実施の形態2乃至8の薄膜トランジスタに適用することができる。
液晶表示装置の一形態に相当する液晶表示パネルの外観及び断面について、図15を用いて説明する。図15は、第1の基板4001上に形成された薄膜トランジスタ4010、4011、及び液晶素子4013を、第2の基板4006との間にシール材4005によって封止した、パネルの平面図であり、図15(B)は、図15(A)または図15(C)のM−Nにおける断面図に相当する。
本実施の形態においては、上記実施の形態で説明した液晶表示装置を具備する電子機器の例について説明する。
本実施の形態では、酸化物半導体を用いたボトムゲート型のトランジスタの動作原理について説明する。
本実施の形態では、評価用素子(TEGとも呼ぶ)を用いたオフ電流の測定値について以下に説明する。
本実施の形態では、本発明の一態様である液晶表示装置における走査線駆動回路及び信号線駆動回路を構成するシフトレジスタの構成について図25に一例を示す。
101 配線
102 配線
103 酸化物半導体層
104 容量線
105 画素電極
106 薄膜トランジスタ
Claims (6)
- 表示部に複数の画素を有し、複数のフレーム期間で表示を行う液晶表示装置であって、
前記フレーム期間は、書き込み期間及び保持期間を有し、
前記書き込み期間において、前記複数の画素のそれぞれに、画像信号を入力した後、前記保持期間において、前記複数の画素が有するトランジスタをオフ状態にして、少なくとも30秒間、前記画像信号を保持させることを特徴とする液晶表示装置。 - 表示部に複数の画素を有し、複数のフレーム期間で表示を行う液晶表示装置であって、
前記フレーム期間は、書き込み期間及び保持期間を有し、
前記書き込み期間において、複数回の極性の反転した電圧の画像信号を前記画素に入力した後、前記保持期間において、前記複数の画素のトランジスタをオフ状態にして、少なくとも30秒間、前記画像信号を保持させることを特徴とする液晶表示装置。 - 請求項2において、
前記保持期間における前記複数の画素に保持される電圧の極性は、前記書き込み期間に供給した前記複数回の極性の反転した電圧の画像信号のうち、最後に供給した極性の画像信号であることを特徴とする液晶表示装置。 - 請求項1乃至3のいずれか一において、前記トランジスタは、酸化物半導体でなる半導体層を有し、
前記酸化物半導体は、キャリア濃度が1×1014/cm3未満であることを特徴とする液晶表示装置。 - 請求項4において、前記トランジスタのチャネル幅1μmあたりのオフ電流は、1×10−17A以下であることを特徴とする液晶表示装置。
- 請求項1乃至5のいずれか一に記載の液晶表示装置を具備する電子機器。
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