JPWO2016035295A1 - 表示装置及びその駆動方法 - Google Patents
表示装置及びその駆動方法 Download PDFInfo
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- JPWO2016035295A1 JPWO2016035295A1 JP2016546303A JP2016546303A JPWO2016035295A1 JP WO2016035295 A1 JPWO2016035295 A1 JP WO2016035295A1 JP 2016546303 A JP2016546303 A JP 2016546303A JP 2016546303 A JP2016546303 A JP 2016546303A JP WO2016035295 A1 JPWO2016035295 A1 JP WO2016035295A1
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Abstract
Description
実施の形態における表示装置1について、図面を用いて説明する。
本実施の形態に係る表示装置1は、表示部2と、電源部3と、データ線駆動回路40と、走査線駆動回路50と、制御回路60とを備える。
図2は、本実施の形態に係る表示部2を説明する部分平面図である。また、図3は、図2のA−A’線に沿って切断した断面図であり、図4は、図2のB−B’線に沿って切断した断面図である。図2には、1つの画素20を含む表示部2の一部が表されている。画素20は、図2に示されるように、例えば、赤色表示用のサブ画素20Rと、緑色表示用のサブ画素20Gと、青色表示用のサブ画素20Bと、接続部20Cとを有している。また、図2には、サブ画素ごとに離間して配置された陽極121と、サブ画素列ごとに配置して設けられ、サブ画素を区画するバンク122と、画素20ごとに配置された補助配線131と、駆動回路層と陽極121とを電気接続するビア120とが表されている。
図5は、本実施の形態に係る画素の回路構成の一例を示す図である。同図に示されるサブ画素20Rは、駆動回路層11と、有機EL層12とを備える。駆動回路層11は、データ線212と、走査線211と、正電源配線221と、スイッチトランジスタ203と、駆動トランジスタ202と、保持容量素子204とを有する。また、有機EL層12は、有機EL素子201を有する。なお、図5に示されるサブ画素20G及び20Bも、サブ画素20Rと同様の回路構成を有するが、図5においては、サブ画素20G及び20Bの駆動回路層11の回路構成の記載は省略されている。サブ画素20R、サブ画素20G及びサブ画素20Bを含む画素20は、表示部2に、行列状に配置されている。
以下、本実施の形態の要部である制御回路60の構成について説明する。本実施の形態に係る制御回路60においては、透明陰極127と補助配線131との間において発生する電圧降下量Vdropの変動に伴う各有機EL素子201に流れる電流量の変動を抑制するために階調信号を補正する構成を備える。
次に、上述の階調信号補正を適用した場合における各サブ画素に流れる電流の測定結果について説明する。
以上のように、本実施の形態に係る表示装置1の駆動方法の一態様は、階調信号GLR、GLG及びGLBを出力する制御回路60と、有機EL素子201、及び、階調信号GLRに応じた電流Ipix(R)を有機EL素子201に供給するための駆動トランジスタ202を有するサブ画素20R、有機EL素子201、及び、階調信号GLGに応じた電流Ipix(G)を有機EL素子201に供給するための駆動トランジスタ202を有するサブ画素20G、並びに、有機EL素子201、及び、階調信号GLBに応じた電流Ipix(B)を有機EL素子201に供給するための駆動トランジスタ202を有するサブ画素20Bを備える表示部2と、サブ画素20R、20G及び20Bに共通する電流経路を介して、サブ画素20R、20G及び20Bに電源電圧を印加する電源部3と、を備える表示装置の駆動方法である。そして当該駆動方法は、電流Ipix(R)、Ipix(G)及びIpix(B)が、それぞれ各有機EL素子201に同時に供給される場合に、上記共通する電流経路において生じる電圧降下による、電流Ipix(R)、Ipix(G)及びIpix(B)の減少を補うように、階調信号GLR、GLG及びGLBに基づいて、階調信号GLR、GLG及びGLBを補正するステップを含む。
以上、本発明の表示装置及びその駆動方法について、実施の形態に基づいて説明してきたが、本発明に係る表示装置は、上記実施の形態に限定されるものではない。実施の形態における任意の構成要素を組み合わせて実現される別の実施の形態や、実施の形態に対して本発明の主旨を逸脱しない範囲で当業者が思いつく各種変形を施して得られる変形例や、本実施の形態に係る表示装置を内蔵した各種機器も本発明に含まれる。
2 表示部
3 電源部
10 基板
11 駆動回路層
12 有機EL層
20 画素
20B、20G、20R サブ画素
20C 接続部
30 給電線
40 データ線駆動回路
50 走査線駆動回路
60 制御回路
111 ゲート電極
112 ゲート絶縁層
113 半導体層
114 ソース電極
115 ドレイン電極
116 層間絶縁層
120 ビア
121 陽極
122 バンク
123 正孔注入層
124 正孔輸送層
125 有機発光層
126 電子輸送層
127 透明陰極
131 補助配線
201 有機EL素子
202 駆動トランジスタ
203 スイッチトランジスタ
204 保持容量素子
211 走査線
212 データ線
221 正電源配線
300 電流演算部
301、302、303、401、501、502、503 LUT
400 電圧降下量演算部
500 補正量演算部
600 加算部
Claims (18)
- 第1の階調信号及び第2の階調信号を出力する制御回路と、
電流駆動型発光素子である第1の発光素子、及び、前記第1の階調信号に応じた第1の電流を前記第1の発光素子に供給するための第1の駆動トランジスタを有する第1の画素、並びに、電流駆動型発光素子である第2の発光素子、及び、前記第2の階調信号に応じた第2の電流を前記第2の発光素子に供給するための第2の駆動トランジスタを有する第2の画素を備える表示部と、
前記第1の画素及び前記第2の画素に共通する電流経路を介して、前記第1の画素及び前記第2の画素に電源電圧を印加する電源部と、を備える表示装置の駆動方法であって、
前記駆動方法は、
前記第1の電流及び前記第2の電流が、それぞれ前記第1の発光素子及び前記第2の発光素子に同時に供給される場合に、前記電流経路において生じる電圧降下による、前記第1の電流の減少を補うように、前記第1の階調信号及び前記第2の階調信号に基づいて、前記第1の階調信号を補正するステップを含む
表示装置の駆動方法。 - 前記補正するステップは、
前記第1の階調信号及び前記第2の階調信号に基づいて、前記電流経路において生じる電圧降下量を求めるステップと、
前記電圧降下量に基づいて、前記第1の階調信号を補正する量を求めるステップとを含む
請求項1に記載の表示装置の駆動方法。 - 前記第1の発光素子及び前記第2の発光素子は、一方の電極を共有し、
前記電流経路は前記電極と電気的に接続された補助配線を含み、
前記電圧降下量は、前記電極から前記補助配線の間において発生する電圧降下の量である
請求項2に記載の表示装置の駆動方法。 - 前記電圧降下量は、前記第1の電流及び前記第2の電流の和と正の相関を有する
請求項2又は3に記載の表示装置の駆動方法。 - 前記第1の電流及び前記第2の電流は、それぞれ、前記第1の階調信号及び前記第2の階調信号と正の相関を有する
請求項1〜4のいずれか1項に記載の表示装置の駆動方法。 - 前記第1の階調信号を補正するステップにおける前記第1の階調信号の補正量に対応する前記電源電圧の補正量は、前記第1の階調信号と正の相関を有する
請求項1〜5のいずれか1項に記載の表示装置の駆動方法。 - 前記制御回路は、さらに第3の階調信号を出力し、
前記表示部は、電流駆動型発光素子である第3の発光素子、及び、前記第3の階調信号に応じた第3の電流を前記第3の発光素子に供給するための第3の駆動トランジスタを有する第3の画素をさらに備え、
前記電源部は、前記第1の画素、前記第2の画素及び前記第3の画素に共通する前記電流経路を介して、前記第1の画素、前記第2の画素及び前記第3の画素に前記電源電圧を印加し、
前記第1の発光素子、前記第2の発光素子及び前記第3の発光素子は、それぞれ、赤色表示用発光素子、緑色表示用発光素子及び青色表示用発光素子であり、
前記補正するステップは、前記第1の電流、前記第2の電流及び前記第3の電流が、それぞれ前記第1の発光素子、前記第2の発光素子及び前記第3の発光素子に同時に供給される場合に、前記電流経路において生じる電圧降下による、前記第1の電流の減少を補うように、前記第1の階調信号、前記第2の階調信号及び前記第3の階調信号に基づいて、前記第1の階調信号を補正するステップを含む
請求項1に記載の表示装置の駆動方法。 - 前記補正するステップにおいて、
前記第1の発光素子及び前記第2の発光素子に、それぞれ、前記第1の階調信号及び前記第2の階調信号に応じた電流が同時に供給される場合における前記第1の電流が、前記第1の発光素子だけに前記第1の階調信号に応じた電流が供給される場合における前記第1の電流の80%以上となるように、前記第1の階調信号を補正する
請求項1又は7に記載の表示装置の駆動方法。 - 前記補正するステップにおいて、
前記第1の発光素子及び前記第2の発光素子に、それぞれ、前記第1の階調信号及び前記第2の階調信号に応じた電流が同時に供給され、かつ、前記第1の階調信号が中輝度以上の階調である場合における前記第1の電流が、前記第1の発光素子だけに前記第1の階調信号に応じた電流が供給される場合における前記第1の電流の80%以上となるように、前記第1の階調信号を補正する
請求項1又は7に記載の表示装置の駆動方法。 - 第1の階調信号及び第2の階調信号を出力する制御回路と、
電流駆動型発光素子である第1の発光素子、及び、前記第1の階調信号に応じた第1の電流を前記第1の発光素子に供給するための第1の駆動トランジスタを有する第1の画素、並びに、電流駆動型発光素子である第2の発光素子、及び、前記第2の階調信号に応じた第2の電流を前記第2の発光素子に供給するための第2の駆動トランジスタを有する第2の画素を備える表示部と、
前記第1の画素及び前記第2の画素に共通する電流経路を介して、前記第1の画素及び前記第2の画素に電源電圧を印加する電源部と、を備える表示装置であって、
前記制御回路は、
前記第1の電流及び前記第2の電流が、それぞれ前記第1の発光素子及び前記第2の発光素子に同時に供給される場合に、前記電流経路において生じる電圧降下による、前記第1の電流の減少を補うように、前記第1の階調信号及び前記第2の階調信号に基づいて、前記第1の階調信号を補正する
表示装置。 - 前記制御回路は、
前記第1の階調信号及び前記第2の階調信号に基づいて、前記電流経路において生じる電圧降下量を求め、かつ、前記電圧降下量に基づいて、前記第1の階調信号を補正する量を求める
請求項10に記載の表示装置。 - 前記第1の発光素子及び前記第2の発光素子は、一方の電極を共有し、
前記電流経路は前記電極と電気的に接続された補助配線を含み、
前記電圧降下量は、前記電極から前記補助配線の間において発生する電圧降下の量である
請求項11に記載の表示装置。 - 前記電圧降下量は、前記第1の電流及び前記第2の電流の和と正の相関を有する
請求項11又は12に記載の表示装置。 - 前記第1の電流及び前記第2の電流は、それぞれ、前記第1の階調信号及び前記第2の階調信号と正の相関を有する
請求項10〜13のいずれか1項に記載の表示装置。 - 前記第1の階調信号の補正量に対応する前記電源電圧の補正量は、前記第1の階調信号と正の相関を有する
請求項10〜14のいずれか1項に記載の表示装置。 - 前記制御回路は、さらに第3の階調信号を出力し、
前記表示部は、電流駆動型発光素子である第3の発光素子、及び、前記第3の階調信号に応じた第3の電流を前記第3の発光素子に供給するための第3の駆動トランジスタを有する第3の画素をさらに備え、
前記電源部は、前記第1の画素、前記第2の画素及び前記第3の画素に共通する前記電流経路を介して、前記第1の画素、前記第2の画素及び前記第3の画素に前記電源電圧を印加し、
前記第1の発光素子、前記第2の発光素子及び前記第3の発光素子は、それぞれ、赤色表示用発光素子、緑色表示用発光素子及び青色表示用発光素子であり、
前記制御回路は、
前記第1の電流、前記第2の電流及び前記第3の電流が、それぞれ前記第1の発光素子、前記第2の発光素子及び前記第3の発光素子に同時に供給される場合に、前記電流経路において生じる電圧降下による、前記第1の電流の減少を補うように、前記第1の階調信号、前記第2の階調信号及び前記第3の階調信号に基づいて、前記第1の階調信号を補正する
請求項10に記載の表示装置。 - 前記制御回路は、
前記第1の発光素子及び前記第2の発光素子に、それぞれ、前記第1の階調信号及び前記第2の階調信号に応じた電流が同時に供給される場合における前記第1の電流が、前記第1の発光素子だけに前記第1の階調信号に応じた電流が供給される場合における前記第1の電流の80%以上となるように、前記第1の階調信号を補正する
請求項10又は16に記載の表示装置。 - 前記制御回路は、
前記第1の発光素子及び前記第2の発光素子に、それぞれ、前記第1の階調信号及び前記第2の階調信号に応じた電流が同時に供給され、かつ、前記第1の階調信号が中輝度以上の階調である場合における前記第1の電流が、前記第1の発光素子だけに前記第1の階調信号に応じた電流が供給される場合における前記第1の電流の80%以上となるように、前記第1の階調信号を補正する
請求項10又は16に記載の表示装置。
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