JP6232595B2 - 表示装置及びその制御方法 - Google Patents
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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]
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- 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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- G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
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- Computer Hardware Design (AREA)
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of El Displays (AREA)
Description
[1.表示装置の基本構成]
図1は、一般的なアクティブマトリクス型表示装置の表示部の状態遷移図である。同図には、ある画素列における、画素行(ライン)ごとの書き込み期間及び非書き込み期間が表されている。縦方向は画素行を、また、横軸は経過時間を示す。ここで、書き込み期間とは、各画素へ信号電圧を供給するために、データ線が使用されている期間のことである。この書き込み期間内において、信号電圧の書き込み動作が画素行順に実行される。本表示装置の画素回路では、書き込み期間において容量素子への電圧保持と駆動トランジスタのゲートへの電圧印加とが同時に行われるため、当該書き込み動作の後、続けて発光動作が実行される。
図3は、実施の形態に係る表示部の有する一画素の回路構成及びその周辺回路との接続を示す図である。同図における画素100は、有機EL素子110と、駆動トランジスタ120と、選択トランジスタ130と、スイッチトランジスタ140と、検査トランジスタ150と、容量素子160とを備える。また、画素100には、正電源線170、負電源線180、データ線31、走査線21、ならびに、制御線22及び23が接続されている。また、画素100は、走査線21、制御線22及び23を介して走査線駆動回路20に接続され、また、データ線31を介して電圧発生部30及び電流検出部40に接続されている。
次に、図2に記載された画素100の周辺回路の構成について説明する。
次に、実施の形態に係る表示装置1の制御方法について説明をする。本制御方法により、有機EL素子110の特性の検出が可能となる。本実施の形態に係る表示装置の制御方法は、(a)画素回路内のリセット動作、(b)映像信号データを反映した信号電圧の書き込み、(c)信号電圧に対応した発光動作、(d)発光期間における有機EL素子110のアノード電圧の高速測定、(e)黒挿入動作、を実行する。
Itk>0の場合:Vt(k+1)=Vtk−|Vtk−Vt(k−1)|/2
Vt0=Vamax、Vt1=Vamax/2 (式1)
以上のように、本実施の形態に係る表示装置の一態様は、電流が流れることにより発光する有機EL素子110と、容量素子160と、容量素子160に保持された電圧に応じた電流を有機EL素子110に流す駆動トランジスタ120と、電圧検出線と、電圧検出線と有機EL素子110のアノード電極との導通及び非導通を切り替える検査トランジスタ150と、電圧検出線に、有機EL素子110のアノード電圧を測定するための調査電圧を供給する電圧発生部30と、電圧発生部30から調査電圧が電圧検出線に印加された状態で、検査トランジスタ150を導通状態にしたときの検査トランジスタ150を流れる電流を検出する電流検出部40と、電流検出部40で検出された電流が流れる方向に基づいて調査電圧の電圧値を更新し、当該更新された調査電圧を電圧発生部30に出力させる制御部50とを備える。
以上実施の形態について述べてきたが、本発明の表示装置及びその制御方法は、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、本発明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。
10 表示部
20 走査線駆動回路
21 走査線
22、23 制御線
30 電圧発生部
31 データ線
32、33、44 スイッチ
40、41 電流検出部
42 反転増幅器
43、160 容量素子
50 制御部
51 計測制御部
52 判定部
53 記憶部
100 画素
110 有機EL素子
120 駆動トランジスタ
130 選択トランジスタ
140 スイッチトランジスタ
150 検査トランジスタ
170 正電源線
180 負電源線
Claims (6)
- 電流が流れることにより発光する発光素子と、
容量素子と、
前記容量素子に保持された電圧に応じた電流を前記発光素子に流す駆動トランジスタと、
電圧検出線と、
前記電圧検出線と前記発光素子の一方の電極との導通及び非導通を切り替えるスイッチ素子と、
前記電圧検出線に、前記発光素子の一方の電極の電圧を測定するための調査電圧を供給する電圧発生部と、
前記電圧発生部から前記調査電圧が前記電圧検出線に印加された状態で、前記スイッチ素子を導通状態にしたときの前記スイッチ素子を流れる電流を検出する電流検出部と、
前記電流検出部で検出された前記電流が流れる方向に基づいて前記調査電圧の電圧値を更新し、当該更新された前記調査電圧を前記電圧発生部に出力させる制御部とを備える
表示装置。 - 前記制御部は、
前記スイッチ素子の導通及び非導通のタイミングを制御する計測制御部と、
前記電流検出部で検出された前記電流の方向が前記電圧検出線から前記一方の電極へ向かう方向である場合、前記調査電圧を減少させ、前記電流検出部で検出された前記電流の方向が前記一方の電極から前記電圧検出線へ向かう方向である場合、前記調査電圧を増加させる判定部とを備え、
前記判定部は、前記調査電圧の変化率が閾値以下となった場合、当該調査電圧を前記発光素子の前記一方の電極の電圧測定値と判定する
請求項1に記載の表示装置。 - さらに、
前記電圧検出線と前記容量素子との導通及び非導通を切り替える選択トランジスタと、
前記駆動トランジスタ及び前記発光素子に流れる電流の経路上に配置され、当該電流を流す、及び、流さない、を切り替えるスイッチトランジスタとを備え、
前記電圧検出線は、前記容量素子に保持される信号電圧を供給するデータ線であり、
前記制御部は、前記容量素子に前記信号電圧を書き込む期間では、前記選択トランジスタを導通状態にして前記電圧検出線から前記信号電圧を前記容量素子に書き込み、前記発光素子が発光している期間では、前記スイッチトランジスタを導通状態にし、かつ、前記スイッチ素子を導通状態にして前記スイッチ素子を流れる電流の方向を検出する
請求項2に記載の表示装置。 - 前記発光素子と前記駆動トランジスタと前記容量素子とを含む画素を複数有し、
複数の前記画素は行列状に配置されており、
前記制御部は、
前記データ線に出力される前記画素ごとに対応した前記信号電圧を、前記判定部で前記一方の電極の電圧測定値と判定された前記調査電圧に基づいて補正する
請求項3に記載の表示装置。 - 電流が流れることにより発光する発光素子と、容量素子と、前記容量素子に保持された電圧に応じた電流を前記発光素子に流す駆動トランジスタとを備える表示装置の制御方法であって、
電圧検出線と発光素子の一方の電極とが非導通の状態で、前記電圧検出線に前記発光素子の電圧を測定するための調査電圧を供給する電圧供給ステップと、 前記調査電圧が前記電圧検出線に印加された状態で、前記電圧検出線と前記発光素子の一方の電極との導通及び非導通を切り替えるスイッチ素子を導通状態にして前記スイッチ素子を流れる電流を検出する電流検出ステップと、
前記電流検出ステップで検出された前記電流が流れる方向に基づいて前記調査電圧の電圧値を更新する電圧更新ステップとを含む
表示装置の制御方法。 - 前記電圧供給ステップ、前記電流検出ステップ、及び前記電圧更新ステップを、この順で複数回繰り返し、
k(kは2以上の自然数)回目の前記電圧供給ステップでは、前記k回目の調査電圧を前記電圧検出線に供給し、
前記k回目の前記電流検出ステップでは、前記スイッチ素子を流れる前記k回目の前記電流を検出し、
前記k回目の前記電圧更新ステップでは、前記電流が流れる方向に基づいて前記k回目の調査電圧の電圧値を更新して(k+1)回目の調査電圧を生成するとともに、前記(k+1)回目の調査電圧と前記k回目の調査電圧との電圧差が所定値以下となった場合に、前記(k+1)回目の調査電圧を前記発光素子の前記一方の電極の電圧測定値と判定する
請求項5に記載の表示装置の制御方法。
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