JP5483860B2 - 有機発光ダイオード表示装置 - Google Patents
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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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Description
図3において横軸は試料用A−Si:H TFTのゲート電圧[V]であり縦軸は試料用A−Si:H TFTのソース電極とドレーン電極の間の電流[A]を示す。
本発明の第2実施形態による有機発光ダイオード表示装置では第1実施形態と同一に電流データを階調別で制御することは難しいから、比較的高いレベルを持つ基準電流を利用して補償のための電圧値をセッティングして、このセッティングされた電圧値をダウンスケーリングさせて実際有機発光ダイオードに流れる駆動電流を形成する。しかし、第2実施形態による有機発光ダイオード表示装置では駆動素子のゲート電極の電位を基準電圧で固定させて、駆動素子のソース電極の電位を補償のための電圧値でセッティングすることと共にこのセッティングされた電圧を上向き変動させて駆動電流をダウンスケーリングさせる。
本発明の第3実施形態に係る有機発光ダイオード表示装置では第2実施形態と同じく電流データを階調別で制御することは難しいから、比較的高いレベルを持つ基準電流を利用して補償のための電圧値をセッティングして、このセッティングされた電圧値をダウンスケーリングさせて実際有機発光ダイオードに流れる駆動電流を形成する。しかし、第3実施形態に係る有機発光ダイオード表示装置では駆動素子のゲート電極の電位を高電位駆動電圧で固定させて、駆動素子のソース電極の電位を補償のための電圧値でセッティングすることと共にこのセッティングされた電圧を上向き変動させて駆動電流をダウンスケーリングさせる。
本発明の第4実施形態に係る有機発光ダイオード表示装置では第1実施形態と同じく駆動素子のソース電極の電位を補償のための電圧値でセッティングして固定させて駆動素子のゲート電極の電位を既に供給された基準電圧から下向き/上向き変動させて駆動電流をダウン/アップスケーリングさせる。ただ、第4実施形態に係る有機発光ダイオード表示装置は駆動素子のしきい電圧の劣化を最小化するために一画素内に駆動素子をデュアルで構成して一定期間を周期的に交互に駆動される二つのスキャン信号を利用して駆動素子を交互に駆動させる。
Claims (13)
- データラインと、
前記データラインと交差されてスキャンパルスが供給される第1及び第2ゲートラインと、
高電位駆動電圧を発生する高電位駆動電圧源と、
低電位駆動電圧を発生する低電位駆動電圧源と、
前記高電位駆動電圧源と前記低電位駆動電圧源の間に流れる電流によって発光される発光素子と、
前記高電位駆動電圧源と前記発光素子の間に並列接続された第1及び第2駆動素子であって、各々のドレイン電極に前記高電位駆動電圧源が接続され、各々のゲート-ソース間電圧によって前記発光素子に流れる電流を制御する第1及び第2駆動素子と、
前記第1ゲートラインからの第1スキャンパルスに応じて、前記第1駆動素子のゲート電極に第1電圧を印加して前記第1駆動素子をターンオンさせると共に前記第1駆動素子に基準電流を前記発光素子を介さずに前記低電位駆動電圧源に向けて流すことにより前記第1駆動素子のソース電圧をセンシング電圧でセッティングした後、前記第1駆動素子のゲート-ソース間電圧を階調に応じて調節して保持し、前記第1駆動素子のゲート電極又はソース電極の電位を変化させて前記保持したゲート-ソース間電圧を減らす、または増やして前記発光素子に印加されるべき電流をスケーリングし、前記第2ゲートラインからの第2スキャンパルスに応じて、前記第2駆動素子のゲート電極に前記第1電圧を印加して前記第2駆動素子をターンオンさせると共に前記第2駆動素子に基準電流を前記発光素子を介さずに前記低電位駆動電圧源に向けて流して前記第2駆動素子のソース電圧を前記センシング電圧でセッティングした後、前記第2駆動素子のゲート-ソース間電圧を階調に応じて調節して保持し、前記第2駆動素子のゲート電極又はソース電極の電位を変化させて前記保持したゲート-ソース間電圧を減らす、または増やして前記発光素子に印加される電流をスケーリングする駆動電流安定化回路を備え、
前記第1駆動素子と前記第2駆動素子がk(kは自然数)フレーム期間で周期的に交互に駆動され、
前記第1スキャンパルスは第1の幅を持つ第1の第1スキャンパルスと第2の幅を持つ第2の第1スキャンパルスを含み、前記第2スキャンパルスは前記第1の幅を持つ第1の第2スキャンパルスと前記第2の幅を持つ第2の第2スキャンパルスを含み、
前記第1の第1スキャンパルスと前記第2の第1スキャンパルスはそれぞれ前記データラインを通じて供給される負極性データ電圧に同期されてkフレームで周期的に交互に発生され、前記第1の第2スキャンパルスと前記第2の第2スキャンパルスはそれぞれ前記データラインを通じて供給される正極性データ電圧に同期されて前記kフレームで周期的に交互に発生されることを特徴とする有機発光ダイオード表示装置。 - 前記第1電圧は前記高電位駆動電圧と前記低電位駆動電圧の間の電圧で決まる基準電圧に固定されることを特徴とする、請求項1記載の有機発光ダイオード表示装置。
- 前記第1電圧は前記高電位駆動電圧であることを特徴とする、請求項1記載の有機発光ダイオード表示装置。
- 前記第1及び第2駆動素子の各駆動素子について、前記駆動電流安定化回路は第1期間の間、前記駆動素子のソース電圧をセンシング電圧でセッティングした後、第2期間の間、前記駆動素子のゲート-ソース間電圧を調節して、
前記発光素子は前記第1及び第2期間の間にはターンオフされる一方、前記第2期間に続く第3期間の間にはターンオンされ、
前記第1期間はハイ論理電圧で維持される前記スキャンパルスの前半部区間であり、
前記第2期間はハイ論理電圧で維持される前記スキャンパルスの後半部区間であり、
前記第3期間は前記スキャンパルスがロー論理電圧で維持される区間であることを特徴とする、請求項1記載の有機発光ダイオード表示装置。 - 前記第1及び第2駆動素子の各駆動素子について、前記駆動素子のソース電極の電位は前記センシング電圧に固定される一方、前記駆動素子のゲート電極の電位は前記第1電圧から下向きに変動され、
前記データラインと平行に形成されるセンシングラインをさらに備え、
前記駆動電流安定化回路は、
前記データライン及び前記センシングラインと前記第1ゲートラインの交差領域内で前記第1ゲートライン、前記第1駆動素子及び前記発光素子に接続される第1セル駆動回路と、
前記データライン及び前記センシングラインと前記第2ゲートラインの交差領域内で前記第2ゲートライン、前記第2駆動素子及び前記発光素子に接続される第2セル駆動回路と、
前記データライン及び前記センシングラインを介して前記第1及び第2セル駆動回路に接続されるデータ駆動回路を備えることを特徴とする、請求項4記載の有機発光ダイオード表示装置。 - 前記データ駆動回路は、
前記第1期間の間、前記第1電圧を前記データラインに供給した後、前記第2期間の間、前記第1電圧からデータ変動分だけ下向きに変動されたデータ電圧を前記データラインに供給する第1データ駆動器と、
前記第1期間の間、前記センシングラインに前記基準電流を流して前記駆動素子のソース電圧をセッティングした後、前記第2期間の間、前記セッティングされた駆動素子のソース電圧を一定に維持させる第2データ駆動器を備えることを特徴とする、請求項5記載の有機発光ダイオード表示装置。 - 前記第1データ駆動器は、
前記高電位駆動電圧と前記低電位駆動電圧の間の電圧で決まる基準電圧を発生する基準電圧源と、
前記基準電圧と前記データ電圧を交互に発生するデータ発生部と、
前記データ発生部からの前記基準電圧及びデータ電圧を安定化させて前記データラインに出力する第1バッファーを備え、
前記データ発生部は外部メモリーから供給される駆動時間による前記駆動素子の移動度偏差分を考慮して前記データ変動分を抽出して、前記基準電圧からこのデータ変動分を減算して前記データ電圧を発生し、
前記第2データ駆動器は、
前記基準電流を発生させるための基準電流源と、
前記センシング電圧を一定に維持させる第2バッファーと、
前記第1期間の間、前記基準電流源と前記第2バッファーの入力端の間の電流パスを形成する一方、前記第2期間の間には前記基準電流源と前記第2バッファーの入力端の間の電流パスを遮断する第1スイッチと、
前記第1期間の間前記センシングラインと前記基準電流源の間の電流パスを形成して、前記第2期間の間前記センシングラインと前記第2バッファーの出力端の間の電流パスを形成する第2スイッチを備えることを特徴とする、請求項6記載の有機発光ダイオード表示装置。 - 前記第1及び第2駆動素子各々のゲート電極の電位は前記第1電圧に固定される一方、前記第1及び第2駆動素子各々のソース電極の電位は前記センシング電圧から上向きに変動されることを特徴とする、請求項1記載の有機発光ダイオード表示装置。
- 前記第1電圧が供給される基準電圧供給配線をさらに備えることを特徴とする、請求項8記載の有機発光ダイオード表示装置。
- 前記第1セル駆動回路は、第1ノードを通じて前記第1駆動素子のゲート電極と接続された一方の電極と、第2ノードを通じて前記第1駆動素子のソース電極に接続された他方の電極を持つ第1ストレージキャパシターと、前記第1ゲートラインからの第1スキャンパルスに応答して前記データラインと前記第1ノードの間の電流パスを切り替える第1スイッチTFTと、前記第1スキャンパルスに応答して前記センシングラインと前記第2ノードの間の電流パスを切り替える第2スイッチTFTを備えて、
前記第2セル駆動回路は、第3ノードを通じて前記第2駆動素子のゲート電極と接続された一方の電極と、第4ノードを通じて前記第2駆動素子のソース電極に接続された他方の電極を持つ第2ストレージキャパシターと、前記第2ゲートラインからの第2スキャンパルスに応答して前記データラインと前記第3ノードの間の電流パスを切り替える第3スイッチTFTと、前記第2スキャンパルスに応答して前記センシングラインと前記第4ノードの間の電流パスを切り替える第4スイッチTFTを備える、請求項5記載の有機発光ダイオード表示装置。 - 前記データラインと前記第1ゲートラインの交差領域内で前記第1ゲートライン、前記第1駆動素子及び前記発光素子に接続される第1セル駆動回路と、
前記データラインと前記第2ゲートラインの交差領域内で前記第2ゲートライン、前記第2駆動素子及び前記発光素子に接続される第2セル駆動回路とを備え、
前記第1セル駆動回路は、第1ノードを通じて前記第1駆動素子のゲート電極と接続された一方の電極と、第2ノードを通じて前記第1駆動素子のソース電極に接続された他方の電極を持つ第1ストレージキャパシターと、前記第1ゲートラインからの第1スキャンパルスに応答して前記基準電圧供給配線と前記第1ノードの間の電流パスを切り替える第1スイッチTFTと、前記第1スキャンパルスに応答して前記データラインと前記第2ノードの間の電流パスを切り替える第2スイッチTFTを備え、
前記第2セル駆動回路は、第3ノードを通じて前記第2駆動素子のゲート電極と接続された一方の電極と、第4ノードを通じて前記第2駆動素子のソース電極に接続された他方の電極を持つ第2ストレージキャパシターと、前記第2ゲートラインからの第2スキャンパルスに応答して前記基準電圧供給配線と前記第3ノードの間の電流パスを切り替える第3スイッチTFTと、前記第2スキャンパルスに応答して前記データラインと前記第4ノードの間の電流パスを切り替える第4スイッチTFTを備える、請求項9記載の有機発光ダイオード表示装置。 - 前記データラインと前記第1ゲートラインの交差領域内で前記第1ゲートライン、前記第1駆動素子及び前記発光素子に接続される第1セル駆動回路と、
前記データラインと前記第2ゲートラインの交差領域内で前記第2ゲートライン、前記第2駆動素子及び前記発光素子に接続される第2セル駆動回路とを備え、
前記第1セル駆動回路は、第1ノードを通じて前記第1駆動素子のゲート電極と接続された一方の電極と、第2ノードを通じて前記第1駆動素子のソース電極に接続された他方の電極を持つ第1ストレージキャパシターと、前記第1ゲートラインからの第1スキャンパルスに応答して前記高電位駆動電圧源と前記第1ノードの間の電流パスを切り替える第1スイッチTFTと、前記第1スキャンパルスに応答して前記データラインと前記第2ノードの間の電流パスを切り替える第2スイッチTFTを備え、
前記第2セル駆動回路は、第3ノードを通じて前記第2駆動素子のゲート電極と接続された一方の電極と、第4ノードを通じて前記第2駆動素子のソース電極に接続された他方の電極を持つ第2ストレージキャパシターと、前記第2ゲートラインからの第2スキャンパルスに応答して前記高電位駆動電圧源と前記第3ノードの間の電流パスを切り替える第3スイッチTFTと、前記第2スキャンパルスに応答して前記データラインと前記第4ノードの間の電流パスを切り替える第4スイッチTFTを備える、請求項8記載の有機発光ダイオード表示装置。 - 前記第1の幅は前記第2の幅よりも小さいことを特徴とする請求項1記載の有機発光ダイオード表示装置。
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US8305303B2 (en) | 2012-11-06 |
US20120327065A1 (en) | 2012-12-27 |
KR100939211B1 (ko) | 2010-01-28 |
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ES2556650T3 (es) | 2016-01-19 |
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