JP2008241782A - 表示装置及びその駆動方法と電子機器 - Google Patents
表示装置及びその駆動方法と電子機器 Download PDFInfo
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Abstract
【解決手段】ライトスキャナ4は、走査線WSに制御信号を印加してサンプリングトランジスタTr1をオンし信号電位のサンプリングを開始した後走査線WSに印加した制御信号を解除してサンプリングトランジスタTr1をオフする。ドライブスキャナ5は、サンプリングトランジスタTr1がオンしてからオフするまでの映像信号書込期間のなかで、走査線DSにパルス状の制御信号を印加してスイッチングトランジスタTr4を限られた補正時間だけオンし、ドライブトランジスタTrdの移動度に対する一回目の補正を行う。この後映像信号の信号電位が高くない場合映像信号書込期間の最後で追加の補正時間分二回目の補正を画素容量Csに保持された信号電位にかける一方、映像信号の信号電位が高い場合には二回目の補正がかからない様にする。
【選択図】図2
Description
Ids=(1/2)μ(W/L)Cox(Vgs−Vth)2・・・式1
このトランジスタ特性式1において、Idsはソース/ドレイン間に流れるドレイン電流を表わしており、画素回路では発光素子に供給される出力電流である。Vgsはソースを基準としてゲートに印加されるゲート電圧を表わしており、画素回路では上述した入力電圧である。Vthはトランジスタの閾電圧である。又μはトランジスタのチャネルを構成する半導体薄膜の移動度を表わしている。その他Wはチャネル幅を表わし、Lはチャネル長を表わし、Coxはゲート容量を表わしている。このトランジスタ特性式1から明らかな様に、薄膜トランジスタは飽和領域で動作する時、ゲート電圧Vgsが閾電圧Vthを超えて大きくなると、オン状態となってドレイン電流Idsが流れる。原理的に見ると上記のトランジスタ特性式1が示す様に、ゲート電圧Vgsが一定であれば常に同じ量のドレイン電流Idsが発光素子に供給される。従って、画面を構成する各画素に全て同一のレベルの映像信号を供給すれば、全画素が同一輝度で発光し、画面の一様性(ユニフォーミティ)が得られるはずである。
Ids=kμ(Vgs−Vth)2=kμ(Vsig−ΔV)2・・・式2
上記式2において、k=(1/2)(W/L)Coxである。この特性式2からVthの項がキャンセルされており、発光素子ELに供給される出力電流IdsはドライブトランジスタTrdの閾電圧Vthに依存しない事が分かる。基本的にドレイン電流Idsは映像信号の信号電圧Vsigによって決まる。換言すると、発光素子ELは映像信号Vsigに応じた輝度で発光する事になる。その際Vsigは負帰還量ΔVで補正されている。この補正量ΔVは丁度特性式2の係数部に位置する移動度μの効果を打ち消すように働く。したがって、ドレイン電流Idsは実質的に映像信号Vsigのみに依存する事になる。
Claims (6)
- 画素アレイ部とこれを駆動する駆動部とからなり、
前記画素アレイ部は、行状の第1走査線及び第2走査線と、列状の信号線と、これらが交差する部分に配された行列状の画素と、各画素に給電する電源ライン及び接地ラインとを備え、
前記駆動部は、各第1走査線に順次第1の制御信号を供給して画素を行単位で線順次走査する第1スキャナと、該線順次走査に合わせて各第2走査線に順次第2の制御信号を供給する第2スキャナと、該線順次走査に合わせて列状の信号線に映像信号を供給する信号セレクタとを備え、
前記画素は、発光素子と、サンプリングトランジスタと、ドライブトランジスタと、スイッチングトランジスタと、画素容量とを含み、
前記サンプリングトランジスタは、そのゲートが該第1走査線に接続し、そのソースが該信号線に接続し、そのドレインが該ドライブトランジスタのゲートに接続し、
前記ドライブトランジスタ及び前記発光素子は該電源ラインと接地ラインとの間で直列に接続して電流路を形成し、
前記スイッチングトランジスタは該電流路に挿入されるとともに、そのゲートが該第2走査線に接続し、
前記画素容量は、該ドライブトランジスタのソースとゲートの間に接続している表示装置であって、
前記サンプリングトランジスタは、該第1走査線から供給された第1の制御信号に応じてオンし、該信号線から供給された映像信号の信号電位をサンプリングして該画素容量に保持し、
前記スイッチングトランジスタは、該第2走査線から供給された第2の制御信号に応じオンして該電流路を導通状態にし、
前記ドライブトランジスタは、該画素容量に保持された信号電位に応じて駆動電流を該導通状態に置かれた電流路を通って該発光素子に流し、
前記第1スキャナは、第1走査線に第1の制御信号を印加して該サンプリングトランジスタをオンし信号電位のサンプリングを開始した後第1走査線に印加した第1の制御信号を解除して該サンプリングトランジスタをオフし、
前記第2スキャナは、該サンプリングトランジスタがオンしてからオフするまでの映像信号書込期間のなかで、第2走査線にパルス状の第2の制御信号を印加して該スイッチングトランジスタを限られた補正時間だけオンし、該ドライブトランジスタの移動度に対する一回目の補正を該画素容量に保持された該信号電位にかけ、この後該映像信号の信号電位が高くない場合該映像信号書込期間の最後で追加の補正時間分二回目の補正を該画素容量に保持された該信号電位にかける一方、該映像信号の信号電位が高い場合には二回目の補正がかからない様にすることを特徴とする表示装置。 - 前記第1スキャナが該第1走査線に印加した該第1の制御信号を解除して該サンプリングトランジスタをオフするオフタイミングに前後して、前記第2スキャナは第2の制御信号を所定のオンタイミングで第2走査線に印加して該スイッチングトランジスタをオンするとともに、
前記第1スキャナは、該オフタイミングで該サンプリングトランジスタをオフするとき、第1の制御信号の立下り波形に傾斜をつけることで、該信号線に供給される映像信号の信号電位が高くない時該オンタイミングよりも該オフタイミングが後になるようにして二回目の補正がかかる様にし、該信号線に供給される映像信号の信号電位が高い時該オンタイミングよりも該オフタイミングが先になるようにして二回目の補正がかからない様にしたことを特徴とする請求項1記載の表示装置。 - 前記第1スキャナは、該第1制御信号の立下り波形に傾斜をつけることで、映像信号の信号電位が下がるほど追加の補正時間が長くなる様にしたことを特徴とする請求項2記載の表示装置。
- 前記第1スキャナは、該第1の制御信号を出力するための出力バッファを有しており、
前記出力バッファは、外部のパルス電源から供給される電源パルスに含まれる立下り波形を抜き取って、該第1の制御信号として第1走査線に出力することを特徴とする請求項2記載の表示装置。 - 画素アレイ部とこれを駆動する駆動部とからなり、
前記画素アレイ部は、行状の第1走査線及び第2走査線と、列状の信号線と、これらが交差する部分に配された行列状の画素と、各画素に給電する電源ライン及び接地ラインとを備え、
前記駆動部は、各第1走査線に順次第1の制御信号を供給して画素を行単位で線順次走査する第1スキャナと、該線順次走査に合わせて各第2走査線に順次第2の制御信号を供給する第2スキャナと、該線順次走査に合わせて列状の信号線に映像信号を供給する信号セレクタとを備え、
前記画素は、発光素子と、サンプリングトランジスタと、ドライブトランジスタと、スイッチングトランジスタと、画素容量とを含み、
前記サンプリングトランジスタは、そのゲートが該第1走査線に接続し、そのソースが該信号線に接続し、そのドレインが該ドライブトランジスタのゲートに接続し、
前記ドライブトランジスタ及び前記発光素子は該電源ラインと接地ラインとの間で直列に接続して電流路を形成し、
前記スイッチングトランジスタは該電流路に挿入されるとともに、そのゲートが該第2走査線に接続し、
前記画素容量は、該ドライブトランジスタのソースとゲートの間に接続している表示装置の駆動方法であって、
該第1走査線から供給された第1の制御信号に応じて前記サンプリングトランジスタがオンし、該信号線から供給された映像信号の信号電位をサンプリングして該画素容量に保持し、
該第2走査線から供給された第2の制御信号に応じ前記スイッチングトランジスタがオンして該電流路を導通状態にし、
該画素容量に保持された信号電位に応じて前記ドライブトランジスタが駆動電流を該導通状態に置かれた電流路を通って該発光素子に流し、
前記第1スキャナは、第1走査線に第1の制御信号を印加して該サンプリングトランジスタをオンし信号電位のサンプリングを開始した後第1走査線に印加した第1の制御信号を解除して該サンプリングトランジスタをオフし、
前記第2スキャナは、該サンプリングトランジスタがオンしてからオフするまでの映像信号書込期間のなかで、第2走査線にパルス状の第2の制御信号を印加して該スイッチングトランジスタを限られた補正時間だけオンし、該ドライブトランジスタの移動度に対する一回目の補正を該画素容量に保持された該信号電位にかけ、この後該映像信号の信号電位が高くない場合該映像信号書込期間の最後で追加の補正時間分二回目の補正を該画素容量に保持された該信号電位にかける一方、該映像信号の信号電位が高い場合には二回目の補正がかからない様にすることを特徴とする表示装置の駆動方法。 - 請求項1に記載された表示装置を備えた電子機器。
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TW097108886A TW200901132A (en) | 2007-03-26 | 2008-03-13 | Display apparatus, driving method therefor and electronic apparatus |
US12/076,785 US8319706B2 (en) | 2007-03-26 | 2008-03-24 | Display apparatus and driving method with first and second time correction of pixel drive transistor |
KR1020080027405A KR20080087708A (ko) | 2007-03-26 | 2008-03-25 | 표시 장치 및 그 구동 방법과, 전자 기기 |
CN200810084543A CN100594535C (zh) | 2007-03-26 | 2008-03-25 | 显示设备、其驱动方法以及电子设备 |
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JP5386994B2 (ja) * | 2009-01-09 | 2014-01-15 | ソニー株式会社 | 表示装置および電子機器 |
US9047815B2 (en) * | 2009-02-27 | 2015-06-02 | Semiconductor Energy Laboratory Co., Ltd. | Method for driving semiconductor device |
SG189366A1 (en) * | 2010-10-20 | 2013-05-31 | Bionano Genomics Inc | Systems and methods for assessing biomolecule characteristics |
KR20120062251A (ko) | 2010-12-06 | 2012-06-14 | 삼성모바일디스플레이주식회사 | 화소 및 이를 이용한 유기전계발광 표시장치 |
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CN104282269B (zh) | 2014-10-17 | 2016-11-09 | 京东方科技集团股份有限公司 | 一种显示电路及其驱动方法和显示装置 |
CN104282270B (zh) | 2014-10-17 | 2017-01-18 | 京东方科技集团股份有限公司 | 栅极驱动电路、显示电路及驱动方法和显示装置 |
EP4207294A4 (en) * | 2021-04-01 | 2024-01-03 | Boe Technology Group Co Ltd | LIGHT EMITTING SUBSTRATE AND DISPLAY DEVICE |
CN113380182B (zh) * | 2021-04-21 | 2022-05-03 | 电子科技大学 | 一种栅控类mos发光led像素驱动电路 |
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JP3613253B2 (ja) | 2002-03-14 | 2005-01-26 | 日本電気株式会社 | 電流制御素子の駆動回路及び画像表示装置 |
JP4195337B2 (ja) | 2002-06-11 | 2008-12-10 | 三星エスディアイ株式会社 | 発光表示装置及びその表示パネルと駆動方法 |
JP2004093682A (ja) | 2002-08-29 | 2004-03-25 | Toshiba Matsushita Display Technology Co Ltd | El表示パネル、el表示パネルの駆動方法、el表示装置の駆動回路およびel表示装置 |
JP3832415B2 (ja) | 2002-10-11 | 2006-10-11 | ソニー株式会社 | アクティブマトリクス型表示装置 |
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