JP4930501B2 - 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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- JP4930501B2 JP4930501B2 JP2008325072A JP2008325072A JP4930501B2 JP 4930501 B2 JP4930501 B2 JP 4930501B2 JP 2008325072 A JP2008325072 A JP 2008325072A JP 2008325072 A JP2008325072 A JP 2008325072A JP 4930501 B2 JP4930501 B2 JP 4930501B2
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- pixel
- transistor
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- organic
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- H—ELECTRICITY
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- H10K59/10—OLED displays
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- H10K59/126—Shielding, e.g. light-blocking means over the TFTs
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- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G09G3/3275—Details of drivers for data electrodes
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- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3266—Details of drivers for scan electrodes
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Description
カラー画像を形成する単位となる1つの画素を構成する複数の副画素が隣接して配置された表示装置において、
前記複数の副画素のうち、少なくとも最も波長が短い発光を得る第1副画素に隣接する第2副画素は、
当該第2副画素を形成するトランジスタのチャネル長またはチャネル幅よりも長い幅をもって少なくとも前記第1副画素との間に配置された遮光体を有する
構成となっている。
1.実施形態(画素の遮光レイアウト)
1−1.実施例1
1−2.実施例2
2.変形例
3.適用例(電子機器)
[システム構成]
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ものとする。
図2は、本適用例に係る有機EL表示装置10に用いられる画素(画素回路)20の具体的な構成例を示す回路図である。
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等を含む駆動回路が形成されたガラス基板201上に形成されている。具体的には、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がその順に形成され、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。ここでは、駆動回路の各構成素子のうち、駆動トランジスタ22のみを図示し、他の構成素子については省略している。
次に、上記構成の画素20が行列状に2次元配置されてなる有機EL表示装置10の回路動作について、図4のタイミング波形図を基に図5および図6の動作説明図を用いて説明する。
図4のタイミング波形図において、時刻t1以前は、前のフレーム(フィールド)における有機EL素子21の発光期間となる。この前フレームの発光期間では、電源供給線32の電位DSが第1電源電位(以下、「高電位」と記述する)Vccpにあり、また、書込みトランジスタ23が非導通状態にある。
時刻t1になると、線順次走査の新しいフレーム(現フレーム)に入る。そして、図5(B)に示すように、電源供給線32の電位DSが高電位Vccpから、信号線33の基準電位Vofsに対してVofs−Vthよりも十分に低い第2電源電位(以下、「低電位」と記述する)Viniに切り替わる。
次に、時刻t3で、図5(D)に示すように、電源供給線32の電位DSが低電位Viniから高電位Vccpに切り替わると、駆動トランジスタ22のゲート電圧Vgが保たれた状態で閾値補正処理が開始される。すなわち、ゲート電圧Vgから駆動トランジスタ22の閾値電圧Vthを減じた電位に向けて駆動トランジスタ22のソース電圧Vsが上昇を開始する。
次に、時刻t5で、図6(B)に示すように、信号線33の電位が基準電位Vofsから映像信号の信号電圧Vsigに切り替わる。続いて、時刻t6で、走査線31の電位WSが高電位側に遷移することで、図6(C)に示すように、書込みトランジスタ23が導通状態になって映像信号の信号電圧Vsigをサンプリングし、当該信号電圧Vsigを画素20内に書き込む。
次に、時刻t7で走査線31の電位WSが低電位側に遷移することで、図6(D)に示すように、書込みトランジスタ23が非導通状態となる。これにより、駆動トランジスタ22のゲート電極は、信号線33から電気的に切り離されるためにフローティング状態になる。
ここで、駆動トランジスタ22の閾値補正(即ち、閾値キャンセル)の原理について説明する。閾値補正処理は、先述したように、駆動トランジスタ22のゲート電圧Vgの初期化電位Vofsを基準として当該電位Vofsから駆動トランジスタ22の閾値電圧Vthを減じた電位に向かって、駆動トランジスタ22のソース電圧Vsを変化させる処理である。
Ids=(1/2)・μ(W/L)Cox(Vgs−Vth)2 ……(1)
ここで、Wは駆動トランジスタ22のチャネル幅、Lはチャネル長、Coxは単位面積当たりのゲート容量である。
Ids=(1/2)・μ(W/L)Cox(Vsig−Vofs−ΔV)2
……(2)
続いて、駆動トランジスタ22の移動度補正の原理について説明する。移動度補正処理は、先述したように、駆動トランジスタ22に流れるドレイン−ソース間電流Idsに応じた補正量ΔVで駆動トランジスタ22のゲート−ソース間の電位差に負帰還をかける処理である。この移動度補正処理により、駆動トランジスタ22のドレイン−ソース間電流Idsの移動度μに対する依存性を打ち消すことができる。
ここで、有機EL素子21の発光時、特に白表示時の書込みトランジスタ23の動作点について考える。先述した回路動作から明らかなように、映像信号の信号電圧Vsigの書込みが終わり、書込みトランジスタ23が非導通状態になった後は、ブートストラップ動作によって駆動トランジスタ22のゲート電圧Vgがソース電圧Vsの上昇に連動して上昇する。このため、駆動トランジスタ22のゲート電圧Vgは信号電圧Vsigよりも高い電圧になる。
そこで、本実施形態では、カラー画像を形成する単位となる1つの画素を構成する複数の副画素が隣接して配置された有機EL表示装置において、次のような画素の遮光レイアウト構造を採るようにする。すなわち、複数の副画素のうち、少なくとも最も波長が短い発光を得る第1副画素に隣接する第2副画素に対して、当該第2副画素を形成するトランジスタのチャネル長またはチャネル幅よりも大きい幅を有する遮光体を第1副画素との間に設けた遮光レイアウト構造とする。
図14は、実施例1に係る遮光レイアウト構造を示す平面図である。ここでは、一例として、RGBの画素(副画素)20R,20G,20Bが、B画素20Bを真ん中にしてその両側にRGの各画素20R,20Gが配置された色配列となっている。図15に、図14のA−A´線に沿った断面構造を示す。
図16は、実施例1の変形例1に係る遮光レイアウト構造を示す平面図であり、図中、図14と同等部分には同一符号を付して示している。本変形例1に係る遮光レイアウト構造は、B画素20Bが両側に隣接するRGの各画素20R,20Gとの間に、書込みトランジスタ23のチャネル幅よりも大きい幅の遮光体303B−1,3303B−2を有する構成となっている。
図17は、実施例1の変形例2に係る遮光レイアウト構造を示す平面図であり、図中、図16と同等部分には同一符号を付して示している。本変形例2に係る遮光レイアウト構造は、GBRの画素20G,20B,20Rの各々について、書込みトランジスタ23の左右上下の4方向において遮光体303−1〜303−4で遮光する構成となっている。
図18は、実施例1の変形例3に係る遮光レイアウト構造を示す断面図であり、図中、図15と同等部分には同一符号を付して示している。本変形例3に係る遮光レイアウト構造は、遮光体303Gの下端部を基板上のゲート絶縁膜232(図3の絶縁膜202に相当)に埋設した構成となっている。
図19は、実施例1の変形例4に係る遮光レイアウト構造を示す断面図であり、図中、図15と同等部分には同一符号を付して示している。本変形例4に係る遮光レイアウト構造は、遮光体303Gの下端部を駆動トランジスタ22のソース電極の配線305と電気的に接続した構成となっている。
図20は、実施例2に係る遮光レイアウト構造を示す断面図であり、図中、図15と同等部分には同一符号を付して示している。
上記実施形態では、有機EL素子21の駆動回路が、基本的に、駆動トランジスタ22および書込みトランジスタ23の2つのトランジスタ(Tr)を有する2Tr構成の場合を例に挙げて説明したが、本発明はこの2Tr構成への適用に限られるものではない。2Tr以外には、例えば、有機EL素子21の発光/非発光を制御するトランジスタを有したり、駆動トランジスタ22のゲート電極に基準電位Vofsを選択的に書き込むスイッチングトランジスタを有したりする画素構成など、種々の画素構成のものが考えられる。
以上説明した本発明による表示装置は、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 (8)
- カラー画像を形成する単位となる1つの画素を構成する複数の副画素が隣接して配置され、
前記複数の副画素は、映像信号を書き込む書込みトランジスタと、当該書込みトランジスタによって書き込まれた前記映像信号に応じて電気光学素子を駆動する駆動トランジスタとを有するとともに、前記駆動トランジスタに流れる電流に応じた補正量で当該駆動トランジスタのゲート−ソース間の電位差に負帰還をかけることによって前記駆動トランジスタの移動度を補正する移動度補正処理の機能を有し、
前記複数の副画素のうち、少なくとも最も波長が短い発光を得る第1副画素に隣接する第2副画素は、当該第2副画素の前記書込みトランジスタのチャネル長またはチャネル幅よりも大きい幅をもって、前記電気光学素子のアノード電極と同じ層に副画素の各々を取り囲むように配線された補助配線の下に、前記第2副画素の長手方向に対して平行に配置された遮光体を有する
表示装置。 - 前記移動度補正処理は、前記書込みトランジスタによる前記映像信号の書込み処理と並行して行われる
請求項1に記載の表示装置。 - 前記移動度補正処理は、前記駆動トランジスタのソース電圧を上昇させながら行われる
請求項1または請求項2に記載の表示装置。 - 前記遮光体は、前記第1副画素の発光から前記書込みトランジスタを光学的に覆うように配置されている
請求項1乃至請求項3のいずれか1項に記載の表示装置。 - 前記遮光体の材質は、前記第2副画素内の電気光学素子のアノード電極を構成する金属配線と同じ材質である
請求項1乃至請求項4のいずれか1項に記載の表示装置。 - 前記遮光体の材質は、前記補助配線と同じ材質である
請求項1に記載の表示装置。 - 前記第1副画素は、当該第1副画素の前記書込みトランジスタのチャネル長またはチャネル幅よりも大きい幅をもって前記第2副画素との間に配置された遮光体を有する
請求項1乃至請求項6のいずれか1項に記載の表示装置。 - カラー画像を形成する単位となる1つの画素を構成する複数の副画素が隣接して配置され、
前記複数の副画素は、映像信号を書き込む書込みトランジスタと、当該書込みトランジスタによって書き込まれた前記映像信号に応じて電気光学素子を駆動する駆動トランジスタとを有するとともに、前記駆動トランジスタに流れる電流に応じた補正量で当該駆動トランジスタのゲート−ソース間の電位差に負帰還をかけることによって前記駆動トランジスタの移動度を補正する移動度補正処理の機能を有し、
前記複数の副画素のうち、少なくとも最も波長が短い発光を得る第1副画素に隣接する第2副画素は、当該第2副画素の前記書込みトランジスタのチャネル長またはチャネル幅よりも大きい幅をもって、前記電気光学素子のアノード電極と同じ層に副画素の各々を取り囲むように配線された補助配線の下に、前記第2副画素の長手方向に対して平行に配置された遮光体を有する
表示装置を有する電子機器。
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| US12/591,865 US8451258B2 (en) | 2008-12-22 | 2009-12-03 | Display apparatus and electronic apparatus |
| TW098142909A TWI528542B (zh) | 2008-12-22 | 2009-12-15 | 顯示設備及電子設備 |
| CN2009102613396A CN101777304B (zh) | 2008-12-22 | 2009-12-21 | 显示装置及电子装置 |
| CN201210339208.7A CN102903327B (zh) | 2008-12-22 | 2009-12-21 | 显示装置及电子装置 |
| KR1020090128879A KR20100074054A (ko) | 2008-12-22 | 2009-12-22 | 표시 장치 및 전자 기기 |
| US13/895,394 US8593441B2 (en) | 2008-12-22 | 2013-05-16 | Display apparatus and electronic apparatus |
| US14/054,916 US8896642B2 (en) | 2008-12-22 | 2013-10-16 | Display apparatus and electronic apparatus |
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| KR1020140120390A KR101624413B1 (ko) | 2008-12-22 | 2014-09-11 | 표시 장치 및 전자 기기 |
| US14/553,164 US9129928B2 (en) | 2008-12-22 | 2014-11-25 | Display apparatus and electronic apparatus |
| US14/813,839 US9653528B2 (en) | 2008-12-22 | 2015-07-30 | Display apparatus and electronic apparatus |
| KR1020160059479A KR101701087B1 (ko) | 2008-12-22 | 2016-05-16 | 표시 장치 및 전자 기기 |
| KR1020160174610A KR101802379B1 (ko) | 2008-12-22 | 2016-12-20 | 표시 장치 및 전자 기기 |
| US15/486,242 US10347668B2 (en) | 2008-12-22 | 2017-04-12 | Display apparatus and electronic apparatus |
| KR1020170156447A KR101955532B1 (ko) | 2008-12-22 | 2017-11-22 | 표시 장치 및 전자 기기 |
| KR1020180043530A KR101955522B1 (ko) | 2008-12-22 | 2018-04-13 | 표시 장치 및 전자 기기 |
| KR1020190023203A KR102004674B1 (ko) | 2008-12-22 | 2019-02-27 | 표시 장치 |
| US16/435,880 US10490576B2 (en) | 2008-12-22 | 2019-06-10 | Display apparatus and electronic apparatus |
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| JP2008309910A (ja) * | 2007-06-13 | 2008-12-25 | Sony Corp | 表示装置、表示装置の駆動方法および電子機器 |
| US8247276B2 (en) * | 2009-02-20 | 2012-08-21 | Semiconductor Energy Laboratory Co., Ltd. | Thin film transistor, method for manufacturing the same, and semiconductor device |
| JP5573686B2 (ja) * | 2011-01-06 | 2014-08-20 | ソニー株式会社 | 有機el表示装置及び電子機器 |
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