TWI250496B - Driving method for current driven active matrix organic light emitting diode pixel - Google Patents
Driving method for current driven active matrix organic light emitting diode pixel Download PDFInfo
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- TWI250496B TWI250496B TW092116779A TW92116779A TWI250496B TW I250496 B TWI250496 B TW I250496B TW 092116779 A TW092116779 A TW 092116779A TW 92116779 A TW92116779 A TW 92116779A TW I250496 B TWI250496 B TW I250496B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- 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]
- G09G3/3225—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] using an active matrix
- G09G3/3233—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] using an active matrix with pixel circuitry controlling the current through the light-emitting element
- G09G3/3241—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] using an active matrix with pixel circuitry controlling the current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
- G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
- Electroluminescent Light Sources (AREA)
Description
1250496 五、發明說明(1) 發明所屬之技術領域 本發明是有關於一種主動矩陣有機發光二極體像素; 特別是有關於一種電流驅動之主動矩陣有機發光二極體像 素驅動方法。 先前技術 隨著資訊科技的發達,各式各樣如電腦、行動電話、 個人數位助理(P D A )及數位相機等資訊設備,均不斷地 推陳出新。在這些資訊設備中,顯示器始終扮演著舉足輕 重之地位,而平面顯示器(Flat Panel Display)由於具有 薄型化、輕量化及省電之特性,乃逐漸地受到歡迎。 在各種平面顯示器中,主動矩陣有機發光二極體 (Active Matrix Organic Emitting Diode ,簡稱 AM0LED)_ 顯示器因具有視角廣、色彩對比效果好、輕薄、響應速度 快及成本低等優點,故十分適用於如電子時鐘、行動電 話、個人數位助理及數位相機等顯示器之應用。 請參看第1圖所示,其為一種電壓驅動之主動矩陣有 機發光二極體像素示意圖。圖中顯示,此主動矩陣有機發 光二極體像素包括:切換開關薄膜電晶體1 1 〇、驅動薄膜 電晶體1 2 0、電容1 3 0及有機發光二極體1 4 0。其顯示灰階 是由資料線上之電壓所決定,當掃描線掃描至此像素時, 會導通切換開關薄膜電晶體1 1 0 ,以將資料線上之電壓傳 送至驅動薄膜電晶體1 2 0之閘極,獲得閘極電壓V g以驅動 所需電流流經有機發光二極體1 4 0顯示,而流經有機發光《I 二極體(0LED)之電流Id —般如下式所示:
11260twf.ptd 第 5 頁 1250496 五、發明說明(2)
Id = (l/2)k(Vgs-Vth)(Vgs-Vth) ..........(1) 然而,由於不同像素之驅動薄膜電晶體1 2 0的臨界電 壓Vth與遷移率(mobility)會因為製程之不均而不同,以 致在相同灰階電壓下,流經有機發光二極體1 4 0的電流I d 也會不同,造成畫面顯示不均勻之情形。 ^ 於是,乃發展出一種電流驅動之主動矩陣有機發光二 極體像素。請參看第2圖所示,其為習知之一種電流驅動 之主動矩陣有機發光二極體像素示意圖。圖中顯示,此主 動矩陣有機發光二極體像素包括:第一薄膜電晶體2 1 0、 第二薄膜電晶體2 2 0 '第三薄膜電晶體2 3 0、電容2 4 0、驅 ^ 動薄膜電晶體2 5 0及有機發光二極體2 6 0。操作時,首先經 由掃描線之掃描控制訊號以導通第一薄膜電晶體2 1 0與第 二薄膜電晶體2 2 0 ,使電流源提供之電流流經第二薄膜電 晶體2 2 0,並對電容2 4 0充電5此時,記憶之閘極電壓會促 使流經第一薄膜電晶體2 1 0與第三薄膜電晶體2 3 0之電流等 於電流源之電流。然後,當掃描線之掃描控制訊號切斷時 (SCAN OFF ),運用先前記憶之閘極電壓,以控制驅動薄 膜電晶體2 5 0,使流經有機發光二極體2 6 0之電流等於電流 源之電流,而顯示所需之亮度。 然而,當此種電流驅動之主動矩陣有機發光二極體像 素在顯示灰階變化極大之前後畫框(f r a m e )時,卻可能遭《I 遇電容2 4 0上記憶之閘極電壓放電不及’導致畫面顯示不
11260twf.ptd 第6頁 1250496 五、發明說明(3) 正確之情形。例如,假設在第η個晝框時,所需之電流源 電流為2 0微安培,因而在電容2 4 0上儲存一個電壓V η,但 在第η + 1個畫框時,所需之電流源電流僅1微安培,於是電 容2 4 0上儲存之電壓必須在極短的時間内放電到V η + 1 ,造 成放電不及之情形。 發明内容 有鑑於此,本發明提供一種電流驅動之主動矩陣有機 發光二極體像素驅動方法,其可在主動矩陣有機發光二極 體像素的資料更新前,提供一預充電訊號至驅動之電流 源,使電容可以經由放電路徑放電,以避免放電不及之問 題產生。 為達上述及其他目的,本發明提供一種電流驅動之主 動矩陣有機發光二極體像素驅動方法,該方法包括下列步 驟:更新驅動主動矩陣有機發光二極體像素之一電流源的 電流值;導通電流源對主動矩陣有機發光二極體像素之一 電容的充電路徑;在導通電流源對主動矩陣有機發光二極 體像素之電容的充電路徑初期,提供一預充電訊號至電流 源,使電容放電;以及完成對電容之充電,並切斷電流源 對主動矩陣有機發光二極體像素之電容的充電路徑。 其中,提供之預充電訊號可以設定為使電容放電至一 預設電位值。 由上述之說明中可知,應用本發明所提供之一種電流 驅動之主動矩陣有機發光二極體像素驅動方法,則可在主 動矩陣有機發光二極體像素的資料更新前,提供一預充電
1 1260twf. pt.d 第7頁 1250496 五、發明說明(4) 訊號至驅動之電流源,使電容可以經由放電路徑先行放 電,以避免放電不及之問題產生。 為讓本發明之上述和其他目的、特徵和優點能更明顯 易懂,下文特以較佳實施例,並配合所附圖式,作詳細說 明如下。 實施方式 · 請參考第3圖所示,其為根據本發明較佳實施例之一 ~ 種電流驅動之主動矩陣有機發光二極體像素驅動方法流程 圖。如前所述,為了避免此種電流驅動之主動矩陣有機發 光二極體像素在顯示灰階變化極大之前後畫框(f r a m e ) 時,因記憶之問極電壓放電不及’導致畫面顯不不正確!之 問題,因此,流程圖中之步驟S 3 3 0提供一預充電訊號至電0 流源,以便可以使電容先行放電,其方法流程將配合第2 圖之電路來說明。 如第2圖所示,因為此種電流驅動之主動矩陣有機發 光二極體像素的顯示灰階是由電流源的電流大小來表示 的,因此在晝面顯示時,必須更新驅動主動矩陣有機發光 二極體像素之電流源的電流值(S 3 1 0 ),以更新主動矩陣 有機發光二極體像素之顯示資料值。 之後,經由掃描線之掃描控制訊號S c a η - 0 η以導通第 一薄膜電晶體2 1 0與第二薄膜電晶體2 2 0 ,也就是導通電容 2 4 0的充電路徑(S 3 2 0 ),此時,控制系統也另提供一預 充電訊號P r e - C h a r g e至電流源,使電容2 4 0可以先行放電 θα 3 3 0 ) 。 此一步 驟較佳 地可以 設定為 使電容 2 4 0 放電至
11260twf.ptd 第8頁 1250496_^ 五、發明說明(5) 一預設電位值,以利於後續充電工作之完成。 然後,控制使電流源提供之電流流經第二薄膜電晶體 2 2 0,並對電容2 4 0充電,以使記憶之閘極電壓促使流經第 一薄膜電晶體2 1 0與第三薄膜電晶體2 3 0之電流等於電流源 之電流,並切斷掃描線之掃描控制訊號(S C A N 0 F F ),也 就是關閉第一薄膜電晶體2 1 0與第二薄膜電晶體2 2 0 ,以切 斷電容2 4 0的充電路徑(S 3 4 0 ),並運用先前記憶之閘極 — 電壓,控制驅動薄膜電晶體2 5 0,使流經有機發光二極體 _ 2 6 0之電流等於電流源之電流,而顯示所需之亮度。有關 掃描控制訊號S c a η - 0 η與預充電訊號P r e - C h a r g e的操作時 序,可參考第4圖之時序圖所示。 故知,本發明因在主動矩陣有機發光二極體像素的資0 料更新前,會提供一預充電訊號P r e - C h a r g e至驅動的電流 源,使電容2 4 0可以經由放電路徑先行放電,故可避免放 電不及之問題的產生。 雖然本發明已以較佳實施例揭露如上,然其並非用以 限定本發明,任何熟習此技藝者,在不脫離本發明之精神 和範圍内,當可作各種之更動與潤飾,因此本發明之保護 範圍當視後附之申請專利範圍所界定者為準。
11260t.wf.ptd 第9頁 1250496__ 圖式簡單說明 第1圖係顯示一種電壓驅動之主動矩陣有機發光二極 體像素示意圖; 第2圖係顯示一種電流驅動之主動矩陣有機發光二極 體像素示意圖; 第3圖係顯示根據本發明較佳實施例之一種電流驅動 之主動矩陣有機發光二極體像素驅動方法流程圖;以及 第4圖係顯示根據本發明較佳實施例之掃描控制訊號 與預充電訊號時序圖。 圖式標示說明: 110 切 換 開 關薄 膜 電晶體 120 > 250 驅動 專膜電晶體 130 、240 電容 140 〜260 有機發光二極體 210 第 一 薄 膜電 晶 體 220 第 二 薄 膜電 晶 體 230 第 三 薄 膜電 晶 體 S3 1 0 S340 方法步驟
11260twf.ptd 第10頁
Claims (1)
- T9^04Q6 六、申請專利範圍 1 · 一種電流驅動之主動矩陣有機發光二極體像素驅動 方法,包括下列步驟: 更新驅動該主動矩陣有機發光二極體像素之一電流源 的電流值; 導通該電流源對該主動矩陣有機發光二極體像素之一 電容的充電路徑; 在導通該電流源對該主動矩陣有機發光二極體像素之 ’ 該電容的充電路徑初期,提供一預充電訊號至該電流源, _ 使該電容放電;以及 完成對該電容之充電,並切斷該電流源對該主動矩陣 有機發光二極體像素之該電容的充電路徑。 2 β如申請專利範圍第1項所述之電流驅動之主動矩陣 4 有機發光二極體像素驅動方法,其中該預充電訊號會使該 電容放電至一預設電位值。11260twf.ptd 第11頁
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US10/604,818 US7429969B2 (en) | 2003-06-20 | 2003-08-19 | Method for driving a current-driven active matrix organic light emitting diode pixel |
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CN103927985A (zh) * | 2014-04-01 | 2014-07-16 | 深圳市华星光电技术有限公司 | 一种oled显示器的像素驱动电路、阵列基板以及相应显示器 |
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TWI424408B (zh) * | 2005-08-12 | 2014-01-21 | Semiconductor Energy Lab | 半導體裝置,和安裝有該半導體裝置的顯示裝置和電子裝置 |
US8390536B2 (en) * | 2006-12-11 | 2013-03-05 | Matias N Troccoli | Active matrix display and method |
KR100893481B1 (ko) * | 2007-11-08 | 2009-04-17 | 삼성모바일디스플레이주식회사 | 유기전계발광 표시장치 및 그 구동방법 |
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CN103280183B (zh) * | 2013-05-31 | 2015-05-20 | 京东方科技集团股份有限公司 | 一种amoled像素电路及驱动方法 |
CN104347047B (zh) * | 2014-11-11 | 2016-09-07 | 深圳市华星光电技术有限公司 | 阵列基板、显示设备及其驱动方法 |
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JP3767877B2 (ja) * | 1997-09-29 | 2006-04-19 | 三菱化学株式会社 | アクティブマトリックス発光ダイオード画素構造およびその方法 |
EP1130565A4 (en) * | 1999-07-14 | 2006-10-04 | Sony Corp | ATTACK CIRCUIT AND DISPLAY INCLUDING THE SAME, PIXEL CIRCUIT, AND ATTACK METHOD |
JP2002244617A (ja) * | 2001-02-15 | 2002-08-30 | Sanyo Electric Co Ltd | 有機el画素回路 |
US6876350B2 (en) * | 2001-08-10 | 2005-04-05 | Semiconductor Energy Laboratory Co., Ltd. | Display device and electronic equipment using the same |
TW594628B (en) * | 2002-07-12 | 2004-06-21 | Au Optronics Corp | Cell pixel driving circuit of OLED |
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Cited By (2)
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CN103927985A (zh) * | 2014-04-01 | 2014-07-16 | 深圳市华星光电技术有限公司 | 一种oled显示器的像素驱动电路、阵列基板以及相应显示器 |
CN103927985B (zh) * | 2014-04-01 | 2016-04-06 | 深圳市华星光电技术有限公司 | 一种oled显示器的像素驱动电路、阵列基板以及相应显示器 |
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US7429969B2 (en) | 2008-09-30 |
US20040257314A1 (en) | 2004-12-23 |
TW200501009A (en) | 2005-01-01 |
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