JP5251034B2 - 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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- JP5251034B2 JP5251034B2 JP2007211623A JP2007211623A JP5251034B2 JP 5251034 B2 JP5251034 B2 JP 5251034B2 JP 2007211623 A JP2007211623 A JP 2007211623A JP 2007211623 A JP2007211623 A JP 2007211623A JP 5251034 B2 JP5251034 B2 JP 5251034B2
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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
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—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
- 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]
- G09G3/3225—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] using an active matrix
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- G09G3/20—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
- 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]
- G09G3/3225—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] using an active matrix
- G09G3/3233—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] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—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
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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]
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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]
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- G09G3/3258—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] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
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- G09G3/20—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
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- 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]
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Description
図1は、本発明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)20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10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乃至図6の動作説明図を用いて説明する。なお、図4乃至図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23をスイッチのシンボルで図示している。また、有機EL素子21は容量成分を持っていることから、当該EL容量25についても図示している。
図3のタイミングチャートにおいて、時刻t1以前は有機EL素子21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32の電位DSが第1電位Vccpにあり、また、書き込みトランジスタ23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32の電位DSが第1電位(以下、「高電位」と記述する)Vccpから、信号線33のオフセット電圧Vofs−Vthよりも十分に低い第2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4(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22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22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24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31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23が導通状態となると同時に、水平駆動回路60から信号線33に対して信号電圧Vsigに代えてオフセット電圧Vofs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31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23が導通状態となると同時に、水平駆動回路60から信号線33に対して信号電圧Vsigに代えてオフセット電圧Vofs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31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23が非導通状態となり、同時に、信号線33の電位がオフセット電圧Vofsから映像信号の信号電圧Vsigに切り替わる。
次に、時刻t10で走査線31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から切り離されてフローティング状態になる。
ここで、駆動トランジスタ22の閾値補正の原理について説明する。駆動トランジスタ22は、飽和領域で動作するように設計されているために定電流源として動作する。これにより、有機EL素子21には駆動トランジスタ22から、次式(1)で与えられる一定のドレイン−ソース間電流(駆動電流)Idsが供給される。
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)
で表される。
次に、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。図8に、駆動トランジスタ22の移動度μが相対的に大きい画素Aと、駆動トランジスタ22の移動度μが相対的に小さい画素Bとを比較した状態で特性カーブを示す。駆動トランジスタ22をポリシリコン薄膜トランジスタなどで構成した場合、画素Aや画素Bのように、画素間で移動度μがばらつくことは避けられない。
上述したように、閾値補正および移動度補正の各補正機能を有する有機EL表示装置10において、高精細化に伴って画素サイズの微細化が進むと、有機EL素子21を形成する電極のサイズが小さくなり、それに伴って有機EL素子21の容量成分の容量値が小さくなる。すると、有機EL素子21の容量成分の容量値が下がった分だけ、映像信号の信号電圧Vsigの書込みゲインが低下する。
Vgs=Vsig×{1−Cs/(Cs+Cel)} ……(3)
なる式で表わされる。
G=1−Cs/(Cs+Cel) ……(4)
となる。この式(4)から明らかなように、有機EL素子21の容量成分の容量値Celが低下すると、その分だけ書込みゲインGが低下することがわかる。
G=1−Cs/(Cs+Cel+Csub) ……(5)
なる式で表わされる。
t=(Cel+Csub)×ΔV/Ids ……(6)
なる式で決まる。この式(6)から明らかなように、補助容量の容量値Csubによって移動度補正期間tを調整することができる。
図10は、補助容量を有する画素構成を示す回路図であり、図中、図2と同等部分には同一符号を付して示している。
そこで、本実施形態では、有機EL素子21のカソード電極となる共通電源供給線34と電気的に接続され、有機EL素子21のアノード電極と同じレイヤ(アノードレイヤ)において、図14に示すように、画素アレイ部30の行列状の画素配列に対して例えば行状に(画素行ごとに)配線された固定電位(カソード電位)の補助電極35を積極的に活用し、当該補助電極35に対して補助容量26の他方の電極を画素20ごとに電気的に接続する(コンタクトをとる)ことによって補助容量26を形成するようにしたことを特徴としている。
図15は、補助容量26を有する画素20のレイアウト構造を模式的に示す平面図である。
図16は、実施例1に係る画素20Aの断面構造を示す断面図である。図16の断面図は、図15のA−A線矢視断面図である。
図17は、実施例2に係る画素20Bの断面構造を示す断面図であり、図中、図16と同等部分には同一符号を付して示している。図17の断面図は、図15のA−A線矢視断面図である。
図18は、実施例3に係る画素20Cの断面構造を示す断面図であり、図中、図16および図17と同等部分には同一符号を付して示している。図18の断面図は、図15のA−A線矢視断面図である。
以上説明したように、映像信号の書込みゲインを十分に確保するために補助容量26を画素20個々が有する有機EL表示装置において、行列状の画素配列に対して行状、列状または格子状に配線され、固定電位が与えられた補助電極35に対して、補助容量26の他方の電極262(262A,26AB)を画素20ごとに接続することで、TFTレイヤ207でカソード配線を設けなくても、他方の電極262に固定電位を与えることができる。これにより、配線抵抗を抑えつつ固定電位に対して補助容量26を形成することができるため、配線抵抗に起因して発生する横クロストークを抑えることができ、よって表示画像の画質向上を図ることができる。
以上説明した本発明による表示装置は、一例として、図19〜図23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 (8)
- アノード電極とカソード電極との間に配された電気光学素子と、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、隣接する画素行に属する前記走査線と近接して配線され、前記駆動トランジスタのドレイン電極に対して第1電位と当該第1電位よりも低い第2電位とを選択的に与える電源供給線と、
前記アノード電極と同じ層において、前記画素アレイ部の行列状の画素配列に対して行状、列状または格子状に配線された補助電極とを備え、
前記補助電極は、前記カソード電極と電気的に接続され、
前記画素は、一方の電極が前記駆動トランジスタのソース電極に接続され、他方の電極が前記補助電極に対して画素ごとに設けられたコンタクト部を介して接続された補助容量を有する表示装置。 - 前記補助容量は、一方の電極が前記駆動トランジスタのソース領域およびドレイン領域を形成する半導体層によって形成され、他方の電極が金属材料によって前記半導体層と対向して形成されている請求項1に記載の表示装置。
- 前記他方の電極は、前記電源供給線と同じ配線層に形成され、当該配線層と前記半導体層との間に介在する層間絶縁膜を介して前記一方の電極と対向している請求項2に記載の表示装置。
- 前記他方の電極は、前記駆動トランジスタのゲート電極と同じ配線層に形成され、当該配線層と前記半導体層との間に介在するゲート絶縁膜を介して前記一方の電極と対向している請求項2に記載の表示装置。
- 前記他方の電極は、電気的に接続された第1電極および第2電極からなり、
前記第1電極は、前記駆動トランジスタのゲート電極と同じ配線層に形成され、当該配線層と前記半導体層との間に介在するゲート絶縁膜を介して前記一方の電極と対向し、
前記第2電極は、前記電源供給線と同じ配線層に形成され、当該配線層と前記半導体層の間に介在する層間絶縁膜を介して前記一方の電極と対向している請求項2に記載の表示装置。 - 前記補助電極は、前記アノード電極を形成する電極層によって形成されている請求項1に記載の表示装置。
- 前記補助容量は、一方の電極が前記駆動トランジスタのソース領域およびドレイン領域を形成する半導体層によって形成され、他方の電極が金属材料によって前記半導体層と対向して形成され、
前記補助電極と前記補助容量の他方の電極とは、平坦化膜に形成される前記コンタクト部を介して電気的に接続されている請求項6に記載の表示装置。 - アノード電極とカソード電極との間に配された電気光学素子と、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、隣接する画素行に属する前記走査線と近接して配線され、前記駆動トランジスタのドレイン電極に対して第1電位と当該第1電位よりも低い第2電位とを選択的に与える電源供給線と、
前記アノード電極と同じ層において、前記画素アレイ部の行列状の画素配列に対して行状、列状または格子状に配線された補助電極とを備え、
前記補助電極は、前記カソード電極と接続され、
前記画素は、一方の電極が前記駆動トランジスタのソース電極に接続され、他方の電極が前記補助電極に対して画素ごとに設けられたコンタクト部を介して接続された補助容量を有する表示装置を具備する電子機器。
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CN2008102109785A CN101404140B (zh) | 2007-08-15 | 2008-08-15 | 显示设备和电子装置 |
US14/067,491 US9189994B2 (en) | 2007-08-15 | 2013-10-30 | Display device and electronic equipment |
KR20140096235A KR101493655B1 (ko) | 2007-08-15 | 2014-07-29 | 표시 장치 및 전자 기기 |
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-
2007
- 2007-08-15 JP JP2007211623A patent/JP5251034B2/ja not_active Expired - Fee Related
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2008
- 2008-07-18 TW TW097127502A patent/TWI409754B/zh not_active IP Right Cessation
- 2008-08-07 KR KR20080077285A patent/KR101489000B1/ko active IP Right Grant
- 2008-08-12 US US12/190,366 patent/US20090046040A1/en not_active Abandoned
- 2008-08-15 CN CN2008102109785A patent/CN101404140B/zh active Active
-
2013
- 2013-10-30 US US14/067,491 patent/US9189994B2/en active Active
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2014
- 2014-07-29 KR KR20140096235A patent/KR101493655B1/ko active IP Right Grant
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KR20090017978A (ko) | 2009-02-19 |
US10872560B2 (en) | 2020-12-22 |
CN101404140A (zh) | 2009-04-08 |
JP2009047764A (ja) | 2009-03-05 |
KR101489000B1 (ko) | 2015-02-02 |
CN101404140B (zh) | 2010-12-15 |
KR20150008021A (ko) | 2015-01-21 |
US9189994B2 (en) | 2015-11-17 |
KR101567734B1 (ko) | 2015-11-09 |
US20090046040A1 (en) | 2009-02-19 |
KR101493655B1 (ko) | 2015-02-13 |
TWI409754B (zh) | 2013-09-21 |
US20180261153A1 (en) | 2018-09-13 |
US20160035278A1 (en) | 2016-02-04 |
KR20140110815A (ko) | 2014-09-17 |
TW200915270A (en) | 2009-04-01 |
US20140049456A1 (en) | 2014-02-20 |
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