JP5056265B2 - 表示装置および電子機器 - Google Patents
表示装置および電子機器 Download PDFInfo
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- JP5056265B2 JP5056265B2 JP2007211624A JP2007211624A JP5056265B2 JP 5056265 B2 JP5056265 B2 JP 5056265B2 JP 2007211624 A JP2007211624 A JP 2007211624A JP 2007211624 A JP2007211624 A JP 2007211624A JP 5056265 B2 JP5056265 B2 JP 5056265B2
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Description
図1は、本発明が適用されるアクティブマトリクス型表示装置の構成の概略を示すシステム構成図である。ここでは、一例として、デバイスに流れる電流値に応じて発光輝度が変化する電流駆動型の電気光学素子、例えば有機EL素子(有機電界発光素子)を画素(画素回路)の発光素子として用いたアクティブマトリクス型有機EL表示装置の場合を例に挙げて説明する。
図2は、画素(画素回路)20の具体的な構成例を示す回路図である。
Ids=(1/2)・μ(W/L)Cox(Vgs−Vth)2 ……(1)
図3は、画素20の断面構造の一例を示す断面図である。図3に示すように、画素20は、駆動トランジスタ22、書き込みトランジスタ23等の画素回路が形成されたガラス基板201上に絶縁膜202、絶縁平坦化膜203およびウインド絶縁膜204が順に形成され、当該ウインド絶縁膜204の凹部204Aに有機EL素子21が設けられた構成となっている。
続いて、上記構成の画素20を行列状に2次元配置してなる本適用例に係るアクティブマトリックス型有機EL表示装置10の基本的な回路動作について、図4のタイミング波形図を用いて説明する。
次に、時刻t4で第二補正用走査信号AZ2が“H”レベルから“L”レベルに遷移すると、スイッチングトランジスタ26が非導通状態になる。その後、時刻t5で発光駆動信号DSが“H”レベルから“L”レベルに遷移すると、スイッチングトランジスタ24が導通状態になる。これにより、電源電位Vccpからスイッチングトランジスタ24を通して駆動トランジスタ22には、そのゲート−ソース間電圧Vgsに応じた値の電流が流れる。
続いて、時刻t8で書き込み信号WSが“L”レベルから“H”レベルに遷移すると、書き込みトランジスタ23が導通状態となって映像信号の信号電圧Vsigがサンプリングし、画素内に書き込む。この映像信号の書き込みにより、駆動トランジスタ22のゲート電位Vgが信号電圧Vsigになる。
ΔVs=ΔVg×{Cs/(Coled+Cs+Csub)} ……(2)
その後、書き込みトランジスタ23が導通状態のまま、時刻t9で発光駆動信号DSが“H”レベルから“L”レベルに遷移すると、スイッチングトランジスタ24が導通状態になる。これにより、電源電位Vccpから駆動トランジスタ22への電流供給が開始される。ここで、Vofs−Vth<Vthelと設定しておくことにより、有機EL素子21が逆バイアス状態におかれる。
時刻t10で書き込み信号WSが“L”レベルになり、書き込みトランジスタ23が非導通状態になることにより、移動度補正期間Tが終了し、発光期間に入る。この発光期間では、駆動トランジスタ22のソース電位Vsは、有機EL素子21の駆動電圧まで上昇する。
Ids=kμ(Vgs−Vth)2
=kμ(Vsig−ΔVs)2 ……(3)
上記の式(4)において、k=(1/2)(W/L)Coxである。
ここで、画素20を構成する5つのトランジスタ22〜26、保持容量27および補助容量28と、書き込み走査線31、発光制御走査線32および第一,第二補正用走査線33,34の各配線のレイアウトについて考える。
図5は、画素20の一般的なレイアウトのときの構成素子の配置を示す回路図である。図6にその平面パターンを模式的に示す。
このように、駆動トランジスタ22のゲート電極への配線パターン306が書き込み走査線31および発光制御走査線32の各配線パターンと交差すると、その交差部分において絶縁膜(図3の絶縁膜202に相当)を介して寄生容量が生じる。この寄生容量は、駆動トランジスタ22のゲート電極に付く寄生容量(Cp)となる(図2参照)。
Gbst=ΔVg/ΔVs=Cs/(Cs+Cp) ……(4)
なる式で表わされる。式(4)から明らかなように、駆動トランジスタ22のゲート電極に寄生容量が付き、その容量値Cpが大きくなればなるほど、ブートストラップゲインGbstが低下する。
そこで、本実施形態では、画素20を構成する5つのトランジスタ22〜26、保持容量27および補助容量28と、書き込み走査線31、発光制御走査線32および第一,第二補正用走査線33,34の各配線のレイアウト、特に書き込み走査線31および発光制御走査線32の各配線のレイアウトを工夫することにより、駆動トランジスタ22のゲート電極に寄生容量が付かないようにしている。
図7は、本発明の一実施形態に係るレイアウト構成を採るときの画素20の構成素子の配置を示す回路図である。図8にその平面パターンを模式的に示す。図7および図8において、図5および図6と同等部分には同一符号を付して示している。
以上の説明および図7、図8から明らかなように、本実施形態では、駆動トランジスタ22に加えて、当該駆動トランジスタ22のゲート電極に接続された書き込みトランジスタ23およびスイッチングトランジスタ25を少なくとも有する画素構成の有機EL表示装置10において、書き込み走査線31、好ましくは書き込み走査線31および発光制御走査線32について、駆動トランジスタ22のゲート電極につながる配線パターン、即ち駆動トランジスタ22のゲート電極と書き込みトランジスタ23のソース電極およびスイッチングトランジスタ25のドレイン電極を電気的に接続する配線パターン306と交差しない配線構造としている。
上記実施形態では、駆動トランジスタ22および書き込みトランジスタ23以外に、3つのスイッチングトランジスタ24〜26を有する5Trの画素構成の有機EL表示装置に適用した場合を例に挙げて説明したが、本発明はこの適用例に限られるものではなく、駆動トランジスタ22に加えて、当該駆動トランジスタ22のゲート電極に接続された書き込みトランジスタ23およびスイッチングトランジスタ25を少なくとも有する画素構成の有機EL表示装置全般に対して適用可能である。
以上説明した本発明による表示装置は、一例として、図9〜図13に示す様々な電子機器、例えば、デジタルカメラ、ノート型パーソナルコンピュータ、携帯電話等の携帯端末装置、ビデオカメラなど、電子機器に入力された映像信号、若しくは、電子機器内で生成した映像信号を、画像若しくは映像として表示するあらゆる分野の電子機器の表示装置に適用することが可能である。
Claims (3)
- 電気光学素子と、映像信号を書き込む書き込みトランジスタと、前記書き込みトランジスタによって書き込まれた前記映像信号を保持する保持容量と、前記保持容量に保持された前記映像信号に基づいて前記電気光学素子を駆動する駆動トランジスタと、前記駆動トランジスタのゲート電極に前記映像信号の基準となる基準電位を選択的に書き込むスイッチングトランジスタとを含む画素が行列状に配置された画素アレイ部と、
前記画素アレイ部の画素行ごとに配線され、前記書き込みトランジスタのゲート電極に印加する書き込み信号を伝送する書き込み走査線と、
前記画素アレイ部の画素行ごとに、前記画素の構成素子が配置される領域の外側に配線され、前記スイッチングトランジスタのゲート電極に印加する補正用走査信号を伝送する補正用走査線とを備え、
前記書き込み走査線は、前記補正用走査線のさらに外側に配線され、当該書き込み走査線の配線層と異なる配線層に形成された配線パターンを介して前記書き込みトランジスタのゲート電極と電気的に接続されており、
前記書き込み走査線の配線構造を前記駆動トランジスタのゲート電極につながる配線パターンと交差しないようにした表示装置。 - 前記画素は、前記電気光学素子の発光/非発光を制御する発光制御トランジスタを構成素子としてさらに有し、
前記発光制御トランジスタのゲート電極に印加する発光駆動信号を伝送する発光制御走査線は、前記画素の構成素子が配置される領域を挟んで前記書き込み走査線と反対側に配線され、当該発光制御走査線の配線層と異なる配線層に形成された配線パターンを介して前記発光制御トランジスタのゲート電極と電気的に接続されている請求項1に記載の表示装置。 - 電気光学素子と、映像信号を書き込む書き込みトランジスタと、前記書き込みトランジスタによって書き込まれた前記映像信号を保持する保持容量と、前記保持容量に保持された前記映像信号に基づいて前記電気光学素子を駆動する駆動トランジスタと、前記駆動トランジスタのゲート電極に前記映像信号の基準となる基準電位を選択的に書き込むスイッチングトランジスタとを含む画素が行列状に配置された画素アレイ部と、
前記画素アレイ部の画素行ごとに配線され、前記書き込みトランジスタのゲート電極に印加する書き込み信号を伝送する書き込み走査線と、
前記画素アレイ部の画素行ごとに、前記画素の構成素子が配置される領域の外側に配線され、前記スイッチングトランジスタのゲート電極に印加する補正用走査信号を伝送する補正用走査線とを備え、
前記書き込み走査線は、前記補正用走査線のさらに外側に配線され、当該書き込み走査線の配線層と異なる配線層に形成された配線パターンを介して前記書き込みトランジスタのゲート電極と電気的に接続されており、
前記書き込み走査線の配線構造を前記駆動トランジスタのゲート電極につながる配線パターンと交差しないようにした表示装置を有する電子機器。
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JP5130667B2 (ja) * | 2006-07-27 | 2013-01-30 | ソニー株式会社 | 表示装置 |
JP4259556B2 (ja) * | 2006-09-13 | 2009-04-30 | セイコーエプソン株式会社 | 電気光学装置および電子機器 |
TWI442368B (zh) * | 2006-10-26 | 2014-06-21 | Semiconductor Energy Lab | 電子裝置,顯示裝置,和半導體裝置,以及其驅動方法 |
JP2008257086A (ja) * | 2007-04-09 | 2008-10-23 | Sony Corp | 表示装置、表示装置の製造方法および電子機器 |
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