JP5937779B2 - 液晶表示装置 - Google Patents
液晶表示装置 Download PDFInfo
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- JP5937779B2 JP5937779B2 JP2010229412A JP2010229412A JP5937779B2 JP 5937779 B2 JP5937779 B2 JP 5937779B2 JP 2010229412 A JP2010229412 A JP 2010229412A JP 2010229412 A JP2010229412 A JP 2010229412A JP 5937779 B2 JP5937779 B2 JP 5937779B2
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- oxide semiconductor
- layer
- insulating layer
- transistor
- oxide
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- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/7869—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
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- G02F2201/123—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode pixel
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- G—PHYSICS
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- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
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- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
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- G09G2310/0286—Details of a shift registers arranged for use in a driving circuit
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- G—PHYSICS
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/08—Details of timing specific for flat panels, other than clock recovery
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
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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 (5)
- 表示部に画素を有し、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、
前記画素は、トランジスタと、前記トランジスタと電気的に接続された画素電極とを有し、
前記画素電極は、透光性を有し、
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、Inと、Gaと、Znと、を有し、
前記酸化物半導体は、キャリア濃度が1×10 14 /cm 3 未満となるように、真性化又は実質的に真性化されたものであり、
前記トランジスタに1〜10Vの間のいずれかのドレイン電圧を印加した場合、チャネル幅1μmあたりのオフ電流は、1×10−17A以下であり、
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、前記画素に、画像信号を書き込んだ後、前記保持期間において、前記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10秒間、再度、画像信号を書き込まないことを特徴とする液晶表示装置。 - 表示部に画素を有し、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、
前記画素は、トランジスタと、前記トランジスタと電気的に接続された画素電極とを有し、
前記画素電極は、透光性を有し、
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、Inと、Gaと、Znと、を有し、
前記酸化物半導体は、キャリア濃度が1×10 14 /cm 3 未満となるように、高純度化されたものであり、
前記トランジスタに1〜10Vの間のいずれかのドレイン電圧を印加した場合、チャネル幅1μmあたりのオフ電流は、1×10−17A以下であり、
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、前記画素に、画像信号を書き込んだ後、前記保持期間において、前記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10秒間、再度、画像信号を書き込まないことを特徴とする液晶表示装置。 - 表示部に画素を有し、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、
前記画素は、トランジスタと、前記トランジスタと電気的に接続された画素電極とを有し、
前記画素電極は、透光性を有し、
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、Inと、Gaと、Znと、を有し、
前記酸化物半導体は、キャリア濃度が1×10 14 /cm 3 未満となるように、真性化又は実質的に真性化されたものであり、
前記トランジスタに1〜10Vの間のいずれかのドレイン電圧を印加した場合、チャネル幅1μmあたりのオフ電流は、1×10−17A以下であり、
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、前記画素に、画像信号を書き込んだ後、前記保持期間において、前記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、再度、画像信号を書き込まないことを特徴とする液晶表示装置。 - 表示部に画素を有し、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、
前記画素は、トランジスタと、前記トランジスタと電気的に接続された画素電極とを有し、
前記画素電極は、透光性を有し、
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、Inと、Gaと、Znと、を有し、
前記酸化物半導体は、キャリア濃度が1×10 14 /cm 3 未満となるように、高純度化されたものであり、
前記トランジスタに1〜10Vの間のいずれかのドレイン電圧を印加した場合、チャネル幅1μmあたりのオフ電流は、1×10−17A以下であり、
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、前記画素に、画像信号を書き込んだ後、前記保持期間において、前記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、再度、画像信号を書き込まないことを特徴とする液晶表示装置。 - 請求項1乃至請求項4のいずれか一において、
前記画素は、保持容量を有し、
前記保持容量は、液晶容量に対して、1/3以下の容量値を有することを特徴とする液晶表示装置。
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