JP6175718B2 - 駆動方法および表示装置 - Google Patents
駆動方法および表示装置 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 31
- 239000003990 capacitor Substances 0.000 claims description 81
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- 238000005401 electroluminescence Methods 0.000 description 101
- 238000010586 diagram Methods 0.000 description 22
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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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- G09G3/22—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
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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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- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
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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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- G09G2310/00—Command of the display device
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- Control Of El Displays (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Description
本実施の形態において、本開示の一態様に係る表示装置の発光素子として有機EL(Electroluminescence)素子を用いる場合について説明する。
(基準電圧電源線68の電圧VREF)<電圧VEL+(EL素子66の順方向電流閾値電圧)+(駆動トランジスタ61の閾値電圧)
図3に示す時刻t0〜時刻t1の期間T21は、スイッチ64のみを導通状態として、節点Bの電位を安定させる(節点Bの電位を初期化電源線71の電圧VINIに設定する)ための期間である。
図3に示す時刻t1〜時刻t2の期間T22は、駆動トランジスタ61の閾値電圧補償を行うためにドレイン電流を流すのに必要な電圧を駆動トランジスタ61のソースゲート間に印加する初期化期間である。
図3に示す時刻t2〜時刻t3の期間T23は、スイッチ64とイネーブルスイッチ65とが同時に導通状態とならないようにするための期間である。
次に、図3の時刻t3〜時刻t4の期間T24は、駆動トランジスタ61の閾値電圧を補償する閾値補償期間である。
図3に示す時刻t4〜時刻t5の期間T25は、閾値補償動作を終了させるための期間である。
図3に示す時刻t5〜時刻t6の期間T26は、スイッチ63を非導通状態(オフ状態)にすることで、Data線76を介して供給されたデータ信号電圧と基準電圧電源線68の電圧VREFとが同時に節点Aに印加されるのを防止する期間である。
次に、図3の時刻t6〜時刻t7の期間T27は、Data線76から表示階調に応じた映像信号電圧(データ信号電圧)を画素回路60にスイッチ62を介して取り込み、蓄積容量67に書き込む書込期間である。
図3に示す時刻t7〜時刻t8の期間T28は、スイッチ62を確実に非導通にさせるための期間である。
次に、図3に示す時刻t8〜時刻t9の期間T29は、発光期間である。
図3に示す時刻t9〜時刻t0の期間T30は、すべてのスイッチを非導通状態として、節点Aおよび節点Bの電位を、期間T21で必要な電圧に近い電圧まで変化させるための期間である。
2 表示パネル制御回路
3 走査線駆動回路
5 データ線駆動回路
6、6A 表示パネル
30、32、33 フレキ部分
31、31A、31B ドライバIC
60 画素回路
61 駆動トランジスタ
62、63、64 スイッチ
65 イネーブルスイッチ
66 EL素子
67 蓄積容量
68 基準電圧電源線
69 ELアノード電源線
70 ELカソード電源線
71 初期化電源線
72 Scan線
73 Ref線
74 Init線
75 Enable線
76 Data線
Claims (5)
- マトリクス状に配置された複数の表示画素を有する表示装置の駆動方法であって、
前記複数の表示画素の各々は、
発光素子と、
電圧を保持するための蓄積容量と、
ゲート電極が前記蓄積容量の第1電極と導通し、ソース電極が前記蓄積容量の第2電極および前記発光素子のアノードと導通している、駆動トランジスタと、
第1電源線と前記駆動トランジスタのドレイン電極との導通および非導通を切り換える第1スイッチと、
第2電源線と前記蓄積容量の前記第1電極との導通および非導通を切り換える第2スイッチと、
データ信号電圧を供給するための信号線と前記蓄積容量の前記第1電極との導通および非導通を切り換える第3スイッチと、
前記蓄積容量の前記第2電極と第4電源線との導通および非導通を切り換える第4スイッチと、を備え、
前記複数の表示画素の各々は、
前記第1スイッチおよび前記第3スイッチを非導通、かつ、前記第2スイッチおよび前記第4スイッチを導通に切り換えた後の期間であって前記駆動トランジスタを初期化する初期化期間と、前記第1スイッチおよび前記第2スイッチを導通、かつ、前記第3スイッチおよび前記第4スイッチを非導通に切り換えた後の期間であって前記駆動トランジスタの閾値電圧を補償する閾値電圧補償期間とを有し、
前記複数の表示画素の各々において、
前記初期化期間前に前記第1スイッチ、前記第2スイッチ、前記第3スイッチおよび前記第4スイッチのうち前記第4スイッチのみ導通に切り換えることで第1期間を開始し、前記第2スイッチを導通に切り換えることで前記第1期間に続く前記初期化期間を開始し、
前記第1期間は、前記閾値電圧補償期間よりも長く、前記閾値電圧補償期間の1.6〜4倍の長さであり、前記蓄積容量の前記第2電極の電位を前記第2電源線の電圧近傍の電圧まで低下させる、
駆動方法。 - 前記第4電源線は、前記第1電源線および前記第2電源線と直交する方向に配置されている、
請求項1に記載の駆動方法。 - 前記複数の表示画素の各々において、
前記第1期間前に前記第1スイッチを非導通に切り換えることで、前記発光素子を発光させる期間を終了させて、前記第1スイッチ、前記第2スイッチ、前記第3スイッチおよび前記第4スイッチが非導通に切り換えられた第2期間を開始し、
前記第4スイッチを導通に切り換えることで前記第2期間に続く前記第1期間を開始する、
請求項1または2に記載の駆動方法。 - 前記第1スイッチ、前記第2スイッチ、前記第3スイッチ、前記第4スイッチおよび前記駆動トランジスタは、Nチャンネル薄膜トランジスタである、
請求項1〜3のいずれか1項に記載の駆動方法。 - マトリクス状に配置された複数の表示画素を有する表示装置であって、
前記複数の表示画素の各々は、
発光素子と、
電圧を保持するための蓄積容量と、
ゲート電極が前記蓄積容量の第1電極と導通し、ソース電極が前記蓄積容量の第2電極および前記発光素子のアノードと導通している、駆動トランジスタと、
第1電源線と前記駆動トランジスタのドレイン電極との導通および非導通を切り換える第1スイッチと、
第2電源線と前記蓄積容量の前記第1電極との導通および非導通を切り換える第2スイッチと、
データ信号電圧を供給するための信号線と前記蓄積容量の前記第1電極との導通および非導通を切り換える第3スイッチと、
前記蓄積容量の前記第2電極と第4電源線との導通および非導通を切り換える第4スイッチと、
前記第1スイッチおよび前記第3スイッチが非導通、かつ、前記第2スイッチおよび前記第4スイッチが導通に切り換えられて前記駆動トランジスタが初期化される初期化期間と、前記第1スイッチおよび前記第2スイッチが導通、かつ、前記第3スイッチおよび前記第4スイッチが非導通に切り換えられて前記駆動トランジスタの閾値電圧が補償される閾値電圧補償期間とを実行する制御部とを備え、
前記第4電源線は、前記第1電源線および前記第2電源線と直交する方向に配置されており、
前記制御部は、さらに、
前記複数の表示画素の各々において、前記初期化期間前に前記第4スイッチのみ導通に切り換えることで第1期間を開始させ、前記第2スイッチを導通に切り換えることで前記第1期間に続く前記初期化期間を開始させ、前記第1期間は、前記閾値電圧補償期間よりも長く、前記閾値電圧補償期間の1.6〜4倍の長さになるよう制御することで、前記蓄積容量の前記第2電極の電位を前記第2電源線の電圧近傍の電圧まで低下させる、
表示装置。
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