JP2010160378A - 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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Abstract
【解決手段】本発明は、有機EL素子のアノード電極と駆動トランジスタ1Bのソース電極とが接続され、駆動トランジスタ1Bのゲート電極と書き込みトランジスタ1Aのソース電極またはドレイン電極とが接続され、駆動トランジスタ1Bのゲート−ソース電極間に保持容量1Cが接続され、有機EL素子のアノード電極とカソード電極との間に補助容量1Jが接続される回路構成を含む画素が基板上に行列状に配置された画素アレイ部を備え、隣接する画素のうち一方の画素から他方の画素の領域へ一方の画素の補助容量1Jが入り込む構成で、補助容量1Jの有機EL素子側に配置される電極が有機EL素子のカソード電極と導通している表示装置である。
【選択図】図15
Description
1.本実施形態の前提となる表示装置(システム構成、画素回路、回路動作)
2.従来の画素構造での問題点(画素回路、レイアウト、寄生容量を構成する回路図、タイミングチャート)
3.本実施形態の構成例(システム構成、配線構造の例)
4.適用例(電子機器への各種適用例)
[システム構成]
図1は、本実施形態の前提とな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。
図2は、画素(画素回路)の具体的な構成例を示す回路図である。
次に、上記構成の有機EL表示装置100の回路動作について、図3のタイミング波形図を基に、図4〜図6の動作説明図を用いて説明する。なお、図4〜図6の動作説明図では、図面の簡略化のために、書き込みトランジスタ1Aをスイッチのシンボルで図示している。また、有機EL素子1Dは容量成分を持っていることから、当該EL容量1Iについても図示している。
図3のタイミング波形図において、時刻t1以前は有機EL素子1Dが発光状態にある(発光期間)。この発光期間では、電源供給線DSLの電位DSが第1電位Vcc_Hにあり、また、書き込みトランジスタ1Aが非導通状態にある。
そして、時刻t1になると、線順次走査の新しいフィールドに入り、図4(B)に示すように、電源供給線DSLの電位DSが第1電位(以下、「高電位」と記述する)Vcc_Hから、信号線DTLの信号線基準電位Vo−Vthよりも十分に低い第2電位(以下、「低電位」と記述する)Vcc_Lに切り替わる。
次に、時刻t3で、図4(D)に示すように、電源供給線DSLの電位DSが低電位Vcc_Lから高電位Vcc_Hに切り替わると、駆動トランジスタ1Bのソース電位Vsが上昇を開始し、1回目の閾値補正期間に入る。この1回目の閾値補正期間において、駆動トランジスタ1Bのソース電位Vsが上昇することによって駆動トランジスタ1Bのゲート-ソース間電圧Vgsが所定の電位Vx1になり、この電位Vx1が保持容量1Cに保持される。
時刻t5で次の水平期間に入り、図5(B)に示すように、走査線WSLの電位WSが低電位側から高電位側に遷移し、書き込みトランジスタ1Aが導通状態となると同時に、水平駆動回路103から信号線DTLに対して信号電圧Vinに代えて信号線基準電位Voが供給され、2回目の閾値補正期間に入る。
時刻t7で次の水平期間に入り、図5(D)に示すように、走査線WSLの電位WSが低電位側から高電位側に遷移し、書き込みトランジスタ1Aが導通状態となると同時に、水平駆動回路103から信号線DTLに対して信号電圧Vinに代えて信号線基準電位Voが供給され、3回目の閾値補正期間に入る。
次に、時刻t8で走査線WSLの電位WSが低電位側に遷移することで、図6(A)に示すように、書き込みトランジスタ1Aが非導通状態となり、同時に、信号線DTLの電位がオフセット電圧Voから映像信号の信号電圧Vinに切り替わる。
次に、時刻t10で走査線WSLの電位WSが低電位側に遷移することで、図6(C)に示すように、書き込みトランジスタ1Aが非導通状態となる。これにより、駆動トランジスタ1Bのゲート電極は信号線DTLから切り離されてフローティング状態になる。
[画素回路]
図7は、従来の画素構造における回路図である。画素101は、有機EL素子1D、駆動トランジスタ1B、書き込みトランジスタ1A、保持容量1Cおよび補助容量1Jを有する。
図8は、従来の画素構造を説明する模式平面図である。図8では、R(赤)の画素、G(緑)の画素、B(青)の画素の配置構成を示している。各画素は、水平方向(図中横方向)に延びる電源供給線DSLと走査線WSLとの間に構成され、垂直方向(図中縦方向)に延びる信号線DTLによってRGB各画素の領域が区切られている。
図12は、寄生容量を説明する回路図である。信号線DTLは書き込みトランジスタ1Aと接続され、書き込みトランジスタ1Aのソース電極またはドレイン電極が駆動トランジスタ1Bのゲート電極(ノードg)に接続されている。
図13は、映像信号のサンプリング期間および移動度補正期間の動作を説明するタイミングチャートである。ここでは、B(青)画素のサンプリング電位(発光輝度)の違いによるG(緑)画素の発光輝度の変動を説明する。
(Vsig−Vo)×Cs/(Cs+Coled_G+Csub_G)…式1
となり、寄生容量Cpの影響を受けない。
(Vsig−Vo)×Cs/(Cs+Coled_G+Csub_G+Cp)…式2
となり、寄生容量Cpの影響を受けることになる。
[システム構成]
図14は、本実施形態の一例を示すシステム構成図である。図14に示すように、有機EL表示装置100は、画素(PXLC)101が行列状(マトリクス状)に2次元配置されてなる画素アレイ部102と、当該画素アレイ部102の周辺に配置され、各画素101を駆動する駆動部とを有する構成となっている。画素101を駆動する駆動部としては、例えば、水平駆動回路103、書き込み走査回路104および電源供給走査回路105が設けられている。
図15は、本実施形態の画素構造の一例(その1)を説明する模式平面図である。図15では、R(赤)の画素、G(緑)の画素、B(青)の画素の配置構成を示している。各画素は、水平方向(図中横方向)に延びる電源供給線DSLと走査線WSLとの間に構成され、垂直方向(図中縦方向)に延びる信号線DTLによってRGB各画素の領域が区切られている。
図18は、本実施形態の画素構造の一例(その2)を説明する模式断面図である。この模式断面図は、図15におけるA−A線断面図となっている。この画素構造では、B(青)の画素からG(緑)の画素の領域へB(青)の画素の補助容量1Jが入り込む構成で、この補助容量1JとG(緑)の画素のアノード電極AD−Gとの間にシールド電極SDが設けられたものである。
以上説明した本実施形態に係る表示装置は、本体筐体に設けられることで種々の電子機器として適用可能である。一例として、図19〜図23に示す様々な電子機器に適用される。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 (6)
- 電気光学素子の第1電極と駆動トランジスタのソース電極とが接続され、前記駆動トランジスタのゲート電極と書き込みトランジスタのソース電極またはドレイン電極とが接続され、前記駆動トランジスタのゲート−ソース電極間に保持容量が接続され、前記電気光学素子の第1電極と第2電極との間に補助容量が接続される回路構成を含む画素が基板上に行列状に配置された画素アレイ部を備え、
隣接する画素のうち一方の画素から他方の画素の領域へ前記一方の画素の前記補助容量が入り込む構成で、前記補助容量の前記電気光学素子側に配置される電極が前記電気光学素子の第2電極と導通している
表示装置。 - 前記駆動トランジスタのゲート電極および前記補助容量の前記基板側に配置される電極が第1配線層に設けられ、
画素に映像信号を送る信号線が第2配線層に設けられ、
前記補助容量の前記電気光学素子側に配置される電極が前記第1配線層と前記第2配線層との間に配置される中間層に設けられている
請求項1記載の表示装置。 - 前記中間層はポリシリコンによって構成される
請求項2記載の表示装置。 - 前記電気光学素子は、有機EL(Electro Luminescence)素子であり、
前記第1電極はアノード電極であり、
前記第2電極はカソード電極である
請求項1から3のうちいずれか1項に記載の表示装置。 - 電気光学素子の第1電極と駆動トランジスタのソース電極とが接続され、前記駆動トランジスタのゲート電極と書き込みトランジスタのソース電極またはドレイン電極とが接続され、前記駆動トランジスタのゲート−ソース電極間に保持容量が接続され、前記電気光学素子の第1電極と第2電極との間に補助容量が接続される回路構成を含む画素が基板上に行列状に配置された画素アレイ部を備え、
隣接する画素のうち一方の画素から他方の画素の領域へ前記一方の画素の前記補助容量が入り込む構成で、前記補助容量と前記他方の画素の前記電気光学素子の第1電極との間に前記電気光学素子の第2電極と導通するシールド電極が設けられている
表示装置。 - 本体筐体に表示装置を備えており、
前記表示装置として、
電気光学素子の第1電極と駆動トランジスタのソース電極とが接続され、前記駆動トランジスタのゲート電極と書き込みトランジスタのソース電極またはドレイン電極とが接続され、前記駆動トランジスタのゲート−ソース電極間に保持容量が接続され、前記電気光学素子の第1電極と第2電極との間に補助容量が接続される回路構成を含む画素が基板上に行列状に配置された画素アレイ部を備え、
隣接する画素のうち一方の画素から他方の画素の領域へ前記一方の画素の前記補助容量が入り込む構成で、前記補助容量の前記電気光学素子側に配置される電極が前記電気光学素子の第2電極と導通している
電子機器。
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JP2009003201A JP5386994B2 (ja) | 2009-01-09 | 2009-01-09 | 表示装置および電子機器 |
US12/654,090 US8344388B2 (en) | 2009-01-09 | 2009-12-10 | Display device and electronic apparatus |
EP20090252888 EP2207205A3 (en) | 2009-01-09 | 2009-12-23 | Display device and electronic apparatus |
EP12196031.4A EP2610911A3 (en) | 2009-01-09 | 2009-12-23 | Display device and electronic apparatus |
TW098144785A TWI437540B (zh) | 2009-01-09 | 2009-12-24 | 顯示器及電子裝置 |
KR1020100001174A KR101504779B1 (ko) | 2009-01-09 | 2010-01-07 | 표시 장치 및 전자 기기 |
CN2010100003124A CN101794550B (zh) | 2009-01-09 | 2010-01-08 | 显示装置和电子设备 |
US13/688,581 US8921865B2 (en) | 2009-01-09 | 2012-11-29 | Display device and electronic apparatus |
US14/541,482 US9368065B2 (en) | 2009-01-09 | 2014-11-14 | Display device and electronic apparatus |
US15/139,791 US9653025B2 (en) | 2009-01-09 | 2016-04-27 | Display device and electronic apparatus |
US15/492,657 US10019944B2 (en) | 2009-01-09 | 2017-04-20 | Display device and electronic apparatus |
US16/005,460 US10607541B2 (en) | 2009-01-09 | 2018-06-11 | Display device and electronic apparatus |
US16/803,040 US11004390B2 (en) | 2009-01-09 | 2020-02-27 | Display device and electronic apparatus |
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US20100176400A1 (en) | 2010-07-15 |
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EP2610911A2 (en) | 2013-07-03 |
EP2207205A3 (en) | 2012-08-08 |
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KR20100082722A (ko) | 2010-07-19 |
TW201033974A (en) | 2010-09-16 |
CN101794550A (zh) | 2010-08-04 |
US20170221416A1 (en) | 2017-08-03 |
US10019944B2 (en) | 2018-07-10 |
EP2610911A3 (en) | 2013-07-24 |
US20130093801A1 (en) | 2013-04-18 |
US20180301086A1 (en) | 2018-10-18 |
US20160240137A1 (en) | 2016-08-18 |
EP2207205A2 (en) | 2010-07-14 |
US9653025B2 (en) | 2017-05-16 |
US9368065B2 (en) | 2016-06-14 |
US20150070342A1 (en) | 2015-03-12 |
JP5386994B2 (ja) | 2014-01-15 |
US8344388B2 (en) | 2013-01-01 |
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