JP2008165166A - 有機電界発光表示装置、画素、及び有機電界発光表示装置の駆動方法 - Google Patents
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Abstract
【解決手段】データ信号の供給を受けるデータ線と、走査信号の供給を受ける走査線と、発光制御信号の供給を受ける発光制御線と、電流がシンクされるように電流通路を提供する電流シンク線と、直前走査線Sn−1及び現在走査線Snと接続される複数の画素140と、走査線に走査信号を順次に供給し、発光制御線に発光制御信号を順次に供給する走査駆動部110と、直前走査線Sn−1に走査信号が供給される時には、電流シンク線を通じて所定の電流をシンクして画素140を1次充電し、現在走査線Snに走査信号が供給される時には、データ線に電圧データ信号を供給して画素140を2次充電させるデータ駆動部120と、を備える。
【選択図】図2
Description
120 データ駆動部
130 画素部
140 画素
150 タイミング制御部
120 電流源
121 電流源
122 データ信号生成部
142 画素回路
MD 駆動トランジスタ
M1 第1トランジスタ
M2 第2トランジスタ
M3 第3トランジスタ
M4 第4トランジスタ
M5 第5トランジスタ
C1 第1キャパシタ
C2 第2キャパシタ
N1 第1ノード
N2 第2ノード
OLED 有機発光ダイオード
ELVDD 第1電源
ELVSS 第2電源
Claims (20)
- データ信号の供給を受けるデータ線と、
走査信号の供給を受ける走査線と、
発光制御信号の供給を受ける発光制御線と、
電流がシンクされるように電流通路を提供する電流シンク線と、
前記データ線、前記走査線、前記発光制御線、及び前記電流シンク線によって区画された領域に形成され、直前走査線及び現在走査線と接続される複数の画素と、
前記走査線に走査信号を順次に供給し、前記発光制御線に発光制御信号を順次に供給する走査駆動部と、
前記直前走査線に走査信号が供給される時には、前記電流シンク線を通じて所定の電流をシンクして前記画素を1次充電し、前記現在走査線に走査信号が供給される時には、前記データ線に電圧データ信号を供給して前記画素を2次充電させるデータ駆動部と、
を備えることを特徴とする、有機電界発光表示装置。 - 前記所定の電流の電流値は、前記電流シンク線の負荷キャパシタンスを充電することができる電流値に設定されることを特徴とする、請求項1に記載の有機電界発光表示装置。
- 前記所定の電流の電流値は、前記画素が最大輝度に発光する時に、それぞれの前記画素に含まれる有機発光ダイオードに供給される電流値と同じか、または高い値に設定されることを特徴とする、請求項2に記載の有機電界発光表示装置。
- 前記データ駆動部は、前記電流シンク線ごとに設置されて前記所定の電流をシンクするための電流源を有することを特徴とする、請求項2または3に記載の有機電界発光表示装置。
- 前記データ駆動部は、各々の前記電流シンク線に共通に接続されて前記所定の電流をシンクするための電流源を有することを特徴とする、請求項2または3に記載の有機電界発光表示装置。
- それぞれの前記画素は、有機発光ダイオードを含み、1次充電された電圧及び2次充電された電圧を1つの電圧に変換し、変換された前記1つの電圧に対応する電流を前記有機発光ダイオードに供給することを特徴とする、請求項1〜5のいずれかに記載の有機電界発光表示装置。
- それぞれの前記画素は、
前記有機発光ダイオードに電流を供給する駆動トランジスタと、
前記現在走査線に走査信号が供給される時に、第1ノードにデータ信号を供給する第1トランジスタと、
前記第1ノードと第1電源との間に接続される第2キャパシタと、
前記直前走査線に走査信号が供給される時に、前記電流シンク線と前記駆動トランジスタの第2電極とを電気的に接続させる第2トランジスタと、
前記直前走査線に走査信号が供給される時に、前記駆動トランジスタの、ゲート電極と第2電極とを電気的に接続させる第3トランジスタと、
前記駆動トランジスタのゲート電極と前記第1ノードとの間に接続され、前記発光制御線に発光制御信号が供給されない時にターンオンする第4トランジスタと、
前記駆動トランジスタのゲート電極と前記第1電源との間に接続される第1キャパシタと、
を有することを特徴とする、請求項6に記載の有機電界発光表示装置。 - 前記直前走査線に走査信号が供給される時には、前記第1キャパシタに前記駆動トランジスタの閾値電圧及び移動度を補償することができる電圧が1次充電され、前記現在走査線に走査信号が供給される時には、前記第2キャパシタに前記データ信号に対応する電圧が2次充電されることを特徴とする、請求項7に記載の有機電界発光表示装置。
- 前記第4トランジスタがターンオンする時に、前記第1キャパシタ及び前記第2キャパシタに充電された電圧が1つの電圧に変換され、前記駆動トランジスタは変換された前記1つの電圧に対応する電流を前記有機発光ダイオードに供給することを特徴とする、請求項8に記載の有機電界発光表示装置。
- i(iは自然数)番目の前記発光制御線に供給される発光制御信号は、i−1番目の前記走査線及びi番目の前記走査線に供給される走査信号と重畳して供給されることを特徴とする、請求項7〜9のいずれかに記載の有機電界発光表示装置。
- それぞれの前記画素は、前記駆動トランジスタと前記有機発光ダイオードとの間に接続され、前記発光制御信号が供給されない時にターンオンする第5トランジスタをさらに備えることを特徴とする、請求項7に記載の有機電界発光表示装置。
- 有機発光ダイオードと、
前記有機発光ダイオードに電流を供給するための駆動トランジスタと、
現在走査線に走査信号が供給される時にデータ信号を伝達する第1トランジスタと、
第1電源と前記駆動トランジスタのゲート電極との間に接続される第2キャパシタと、
電流シンク線と前記駆動トランジスタの第2電極との間に接続され、直前走査線に走査信号が供給される時にターンオンする第2トランジスタと、
前記駆動トランジスタのゲート電極と第2電極との間に接続される第3トランジスタと、
前記駆動トランジスタのゲート電極と前記第1電源との間に、前記第2キャパシタと並列に接続される第1キャパシタと、
前記駆動トランジスタのゲート電極と前記第2キャパシタとの間に接続され、発光制御線に発光制御信号が供給されない時にターンオンする第4トランジスタと、
を備えることを特徴とする、画素。 - 前記直前走査線に走査信号が供給される時には、前記電流シンク線にシンクされる所定の電流によって前記第1キャパシタが充電され、前記現在走査線に走査信号が供給される時には、前記データ信号によって前記第2キャパシタが充電されることを特徴とする、請求項12に記載の画素。
- 前記発光制御信号が供給されない時に前記第4トランジスタがターンオンし、前記第1キャパシタに充電された電圧及び前記第2キャパシタに充電された電圧が1つの電圧に変換されることを特徴とする、請求項13に記載の画素。
- 前記駆動トランジスタは、変換された前記1つの電圧に対応する電流を前記有機発光ダイオードに供給することを特徴とする、請求項14に記載の画素。
- 駆動トランジスタと前記有機発光ダイオードとの間に接続され、前記発光制御信号が供給されない時にターンオンする第5トランジスタをさらに備えることを特徴とする、請求項12〜15のいずれかに記載の画素。
- 直前走査線に走査信号が供給される期間の間、それぞれの画素に含まれる駆動トランジスタを経由して所定の電流をシンクし、それぞれの前記画素に含まれる第1キャパシタに電圧を充電する段階と、
現在走査線に走査信号が供給される期間の間、前記画素にデータ信号を供給し、それぞれの前記画素に含まれる第2キャパシタに電圧を充電する段階と、
前記第1キャパシタ及び前記第2キャパシタに充電された電圧を1つの電圧に変換する段階と、
変換された前記1つの電圧に対応する電流をそれぞれの前記画素に含まれる有機発光ダイオードに供給する段階と、
を含むことを特徴とする、有機電界発光表示装置の駆動方法。 - 前記所定の電流の電流値は、電流シンク線の負荷キャパシタンスを充電することができる電流値に設定されることを特徴とする、請求項17に記載の有機電界発光表示装置の駆動方法。
- 前記所定の電流の電流値は、前記画素が最大輝度に発光される時に前記有機発光ダイオードに供給される電流値と同じか、または高い値に設定されることを特徴とする、請求項18に記載の有機電界発光表示装置の駆動方法。
- 前記1つの電圧に変換する段階は、
前記第1キャパシタと前記第2キャパシタとを電気的に接続させることによって行うことを特徴とする、請求項17〜19のいずれかに記載の有機電界発光表示装置の駆動方法。
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EP1939848A2 (en) | 2008-07-02 |
TWI384449B (zh) | 2013-02-01 |
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