TWI475541B - 有機發光二極體顯示裝置 - Google Patents

有機發光二極體顯示裝置 Download PDF

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Publication number
TWI475541B
TWI475541B TW101134846A TW101134846A TWI475541B TW I475541 B TWI475541 B TW I475541B TW 101134846 A TW101134846 A TW 101134846A TW 101134846 A TW101134846 A TW 101134846A TW I475541 B TWI475541 B TW I475541B
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Taiwan
Prior art keywords
transistor
voltage
adjustment signal
coupled
light emitting
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TW101134846A
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English (en)
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TW201413681A (zh
Inventor
Bo Jhang Sun
Chin Hai Huang
Szu Chi Huang
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Chunghwa Picture Tubes Ltd
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Priority to TW101134846A priority Critical patent/TWI475541B/zh
Priority to US13/706,362 priority patent/US9262960B2/en
Publication of TW201413681A publication Critical patent/TW201413681A/zh
Application granted granted Critical
Publication of TWI475541B publication Critical patent/TWI475541B/zh
Priority to US14/945,404 priority patent/US9524672B2/en
Priority to US15/334,298 priority patent/US9773453B2/en

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    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
    • G09G3/3208Control 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]
    • G09G3/3225Control 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
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    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
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    • G09G3/3291Details 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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  • 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

有機發光二極體顯示裝置
本發明是有關於一種顯示裝置,且特別是有關於一種有機發光二極體顯示裝置。
隨著科技的進步,平面顯示器成為近年來最受矚目的顯示技術。其中,有機發光二極體(organic light emitting diode,OLED)顯示器因其自發光、廣視角、省電、製程簡易、低成本、低溫度操作範圍、高應答速度以及全彩化等優點而具有極大的應用潛力,可望成為下一代的平面顯示器之主流。
為了控制有機發光二極體的發光亮度,有機發光二極體通常會串接一電晶體。透過控制電晶體的導通程度,可控制流經有機發光二極體的電流,進而控制有機發光二極體的發光亮度。一般而言,在對畫素進行程式化時,會希望將與有機發光二極體耦接的電晶體的閘極與源極間的電壓控制為等於臨界電壓,以便後序進行編碼補償。因此,如何透過電路設計或調整驅動方式使與有機發光二極體耦接的電晶體的閘極與源極間的電壓等於臨界電壓成為驅動有機發光二極體的一個重要課題。
本發明提供一種有機發光二極體顯示裝置,可提升其 顯示品質。
本發明提出一種有機發光二極體顯示裝置,包括一電源電路及一畫素。電源電路用以提供一第一電壓。畫素包括:一第一電晶體、一第二電晶體、一第三電晶體、一第四電晶體、一第五電晶體、一電容及一有機發光二極體。第一電晶體的第一端接收一資料電壓,第一電晶體的控制端接收一掃描信號。電容的第一端耦接第一電晶體的第二端。第二電晶體的第一端接收第一電壓,第二電晶體的控制端耦接電容的第二端。第三電晶體的第一端耦接第二電晶體的控制端,第三電晶體的控制端接收掃描信號,第三電晶體的第二端耦接第二電晶體的第二端。第四電晶體的第一端耦接第二電晶體的第二端,第四電晶體的控制端接收一發光信號。有機發光二極體,與第二電晶體及第四電晶體串聯耦接於第一電壓與一第二電壓之間。第五電晶體的第一端接收一初始電壓,第五電晶體的控制端接收發光信號,第五電晶體的第二端耦接電容的第一端。在一程式化期間,致能掃描信號且禁能發光信號,並且電源電路調整第一電壓的電壓準位或電流以加速第二電晶體的控制端的電壓準位達到一目標電壓。
在本發明之一實施例中,調整第一電壓的一調整期間小於程式化期間。
在本發明之一實施例中,當第一電晶體、第二電晶體、第三電晶體、第四電晶體及第五電晶體分別為一P型電晶體時,第一電壓為一系統高電壓,第二電壓為一接地 電壓。
在本發明之一實施例中,目標電壓為系統高電壓減去第二電晶體的一臨界電壓。
在本發明之一實施例中,電源電路包括一第一電源供應單元及一第一多工器。第一電源供應單元用以提供一第一參考電壓及一第二參考電壓,第二參考電壓高於第一參考電壓。第一多工器耦接第一電源供應單元以接收第一參考電壓及第二參考電壓,且接收一調整信號。當調整信號為致能時,第一多工器依據調整信號輸出第二參考電壓以作為系統高電壓;當調整信號為禁能時,第一多工器依據調整信號輸出第一參考電壓以作為系統高電壓。
在本發明之一實施例中,調整信號致能於調整系統高電壓的一調整期間。
在本發明之一實施例中,第一多工器包括一第六電晶體及一第七電晶體。第六電晶體的第一端接收第一參考電壓,第六電晶體的控制端接收調整信號,第六電晶體的第二端耦接第二電晶體的第一端。第七電晶體的第一端接收第二參考電壓,第七電晶體的控制端接收調整信號,第七電晶體的第二端耦接第二電晶體的第一端。其中,第六電晶體及第七電晶體分別為一P型電晶體及一N型電晶體。
在本發明之一實施例中,當第一電晶體、第二電晶體、第三電晶體、第四電晶體及第五電晶體分別為一N型電晶體時,第一電壓為一系統低電壓,第二電壓為一系統高電壓。
在本發明之一實施例中,目標電壓為系統低電壓與第二電晶體的一臨界電壓的總和。
在本發明之一實施例中,電源電路包括一第二電源供應單元及一第二多工器。第二電源供應單元用以提供一第三參考電壓及一第四參考電壓,第四參考電壓低於第三參考電壓。第二多工器耦接第二電源供應單元以接收第三參考電壓及第四參考電壓,且接收一調整信號。當調整信號為致能時,第二多工器依據調整信號輸出第四參考電壓以作為系統低電壓;當調整信號為禁能時,第二多工器依據調整信號輸出第三參考電壓以作為系統低電壓。
在本發明之一實施例中,調整信號致能於調整系統低電壓的一調整期間。
在本發明之一實施例中,第二多工器包括一第八電晶體及一第九電晶體。第八電晶體的第一端接收第三參考電壓,第八電晶體的控制端接收調整信號,第八電晶體的第二端耦接第二電晶體的第一端。第九電晶體的第一端接收第四參考電壓,第九電晶體的控制端接收調整信號,第九電晶體的第二端耦接第二電晶體的第一端。其中,第八電晶體及第九電晶體分別為一P型電晶體及一N型電晶體。
在本發明之一實施例中,電源電路包括一第三電源供應單元及一第三多工器。第三電源供應單元用以提供第一電壓及一參考電流,且參考電流為一固定電流。第三多工器,耦接第三電源供應單元以接收第一電壓及參考電流,且接收一調整信號。當調整信號為致能時,第二多工器依 據調整信號輸出參考電流至第二電晶體的第一端;當調整信號為禁能時,第二多工器依據調整信號輸出第一電壓至第二電晶體的第一端。
在本發明之一實施例中,調整信號致能於調整第一電壓的一調整期間。
在本發明之一實施例中,第三多工器包括一第十電晶體及一第十一電晶體。第十電晶體的第一端接收第一電壓,第十電晶體的控制端接收調整信號,第十電晶體的第二端耦接第二電晶體的第一端。第十一電晶體的第一端接收參考電流,第十一電晶體的控制端接收調整信號,第十一電晶體的第二端耦接第二電晶體的第一端。其中,第十電晶體及第十一電晶體分別為一P型電晶體及一N型電晶體。
在本發明之一實施例中,在一發光期間,禁能掃描信號且致能發光信號。
在本發明之一實施例中,有機發光二極體顯示裝置,更包括一資料驅動器,用以提供資料電壓。
在本發明之一實施例中,有機發光二極體顯示裝置,更包括一掃描驅動器,用以提供掃描信號及發光信號。
基於上述,本發明實施例的有機發光二極體顯示裝置,在程式化期間,調整第一電壓的電壓準位或電流,以加速第二電晶體的控制端的電壓準位達到目標電壓。藉此,可降低每一畫素的取樣錯誤率,進而提升有機發光二極體顯示裝置的顯示品質。其中,取樣錯誤率為發光期間 中第二電晶體的閘極的實際電壓準位與預期的電壓準位的誤差值。
為讓本發明之上述特徵和優點能更明顯易懂,下文特舉實施例,並配合所附圖式作詳細說明如下。
圖1為依據本發明第一實施例的有機發光二極體顯示裝置的系統示意圖。請參照圖1,在本實施例中,有機發光二極體顯示裝置100包括時序控制器110、掃描驅動器120、資料驅動器130、電源電路140及顯示面板150。掃描驅動器120耦接時序控制器110及顯示面板150,且受控於時序控制器110提供多個掃描信號SC1及多個發光信號SEM1至顯示面板150。資料驅動器130耦接時序控制器110及顯示面板150,且受控於時序控制器110提供多個資料電壓VDT1至顯示面板150。
電源電路140耦接顯示面板150,且提供系統高電壓VDD1(對應第一電壓)及接地電壓GND(對應第二電壓)至顯示面板150。顯示面板150具有多個畫素PX1,且每一畫素PX1接收系統高電壓VDD1、接地電壓GND、對應的資料電壓VDT1、對應的掃描信號SC1及對應的發光信號SEM1。
每一畫素PX1包括多個電晶體T1~T5(對應第一電晶體至第五電晶體)、電容C1及有機發光二極體OLD1,其中電晶體T1~T5皆為P型電晶體。電晶體T1的源極(對 應第一端)接收對應的資料電壓VDT1,電晶體T1的閘極(對應控制端)接收對應的掃描信號SC1。電容C1的第一端耦接電晶體T1的汲極(對應第二端)。電晶體T2的源極(對應第一端)接收系統高電壓VDD1,電晶體T2的閘極(對應控制端)耦接電容C1的第二端。電晶體T3的源極(對應第一端)耦接電晶體T2的閘極,電晶體T3的閘極(對應控制端)接收對應的掃描信號SC1,電晶體T3的汲極(對應第二端)耦接電晶體T2的汲極(對應第二端)。電晶體T4的源極(對應第一端)耦接電晶體T2的汲極,電晶體T4的閘極(對應控制端)接收對應的發光信號SEM1。有機發光二極體OLD1的陽極耦接電晶體T4的汲極,有機發光二極體OLD1的陰極耦接接地電壓GND。電晶體T5的源極(對應第一端)接收初始電壓Vint1,電晶體T5的閘極(對應控制端)接收對應的發光信號SEM1,電晶體T5的汲極(對應第二端)耦接電容C1的第一端。
在本實施例中,有機發光二極體OLD1順向耦接於電晶體T4的汲極與接地電壓GND之間,但在其他實施例中,有機發光二極體OLD1可順向耦接於系統高電壓VDD1與電晶體T2的源極之間,亦即有機發光二極體OLD1與電晶體T2及T4串聯耦接於系統高電壓VDD1與接地電壓GND之間即可。
圖2A為圖1依據本發明第一實施例的驅動波形示意圖。圖2B為圖2A的畫素於程式化期間的等效示意圖。請 參照圖1、圖2A及圖2B,在此以單一畫素PX1為例,並且,其中每一發光信號SEM1的電壓準位設定為相反於對應的掃描信號SC1。在程式化期間PP1中,掃描驅動器120會致能對應的掃描信號SC1(在此掃描信號SC1的致能準位以低電壓準位為例)且禁能對應的發光信號SEM1(在此發光信號SEM1的禁能準位以高電壓準位為例),並且資料驅動器130會設定對應的資料電壓VDT1的電壓準位。此時,電晶體T1及T3會受控於對應的掃描信號SC1而導通(on),電晶體T4及T5會受控於對應的發光信號SEM1而不導通(off)。其中,電晶體T2的閘極的電壓準位會低於系統高電壓VDD1,電晶體T2的閘極的電壓準位與系統高電壓VDD1之間的壓差會大於等於電晶體T2的臨界電壓,因此電晶體T2會導通,並且電晶體T2的閘極的電壓準位會受經由導通的電晶體T2及T3所傳送的電流Id1開始充電而升高,以致於影響了電晶體T2的導通狀態,但電晶體T2的閘極的電壓準位與系統高電壓VDD1之間的壓差仍會大於等於電晶體T2的臨界電壓。
在發光期間PE1中,掃描驅動器120會禁能對應的掃描信號SC1(在此掃描信號SC1的禁能準位以高電壓準位為例)且致能對應的發光信號SEM1(在此發光信號SEM1的致能準位以低電壓準位為例),並且資料驅動器130會重置對應的資料電壓VDT1的電壓準位。此時,電晶體T1及T3會受控於對應的掃描信號SC1而不導通(off),電晶體T4及T5會受控於對應的發光信號SEM1而導通 (on),其中電晶體T2的導通程度會對應於電晶體T2的閘極的電壓準位,而電晶體T2的閘極的電壓準位決定於初始電壓Vint1及電容C1的跨壓。
如圖2B所示,在程式化期間PP1,流經電容C1的電流Ic會等於流經電晶體T2的電流Id1,並且電流Id1會受制於電晶體T2的閘極的電壓準位,其關係式的推演可參照下述:
其中Id1(t)為電流Id1的瞬間電流大小,Ic(t)為電流Ic的瞬間電流大小,VG(t)為電晶體T2的閘極的瞬間電壓準位,C為電容C1的電容值,VDT為資料電壓VDT1的電壓大小,k0 為電晶體T2的電流係數,電壓準位VDD為系統高電壓VDD1的電壓大小,Vth為電晶體T2的臨界電壓,I0 為初始電流,Cs為一常數。
依據上述,在t=∞的情況下,電晶體T2的閘極的電壓準位會等於VDD-|Vth|(亦即系統高電壓VDD1減去電晶體T2的臨界電壓Vth,對應目標電壓)。然而,當電晶體T2的閘極的電壓準位越高時,電晶體T2的電洞遷移率(hole mobility)及電子遷移率(electron mobility)會降低,以至於在限定的時間內,電晶體T2的閘極的電壓準位無 法達到VDD-|Vth|。
在本實施例中,為了加速電晶體T2的閘極的電壓準位達到系統高電壓VDD1減去電晶體T2的臨界電壓Vth,可控制電源電路140在調整期間PA1內會調高系統高電壓VDD1的電壓準位。其中,調整期間PA1在此設定為程式化期間PP1的一半,本發明實施例不以此為限,但調整期間PA1會小於程式化期間PP1。
圖2C為圖2B的系統高電壓提升及未提高時電晶體的閘極電壓曲線對比示意圖。請參照圖2A及圖2C,曲線210為對應未提高系統高電壓VDD1,曲線220為對應提高後的系統高電壓VDD1,並且程式化期間PP1以5微秒為例。在調高系統高電壓VDD1的電壓準位後,電晶體T2的閘極的電壓準位上升所朝向的電壓準位為調高後的系統高電壓VDD1的電壓準位減去電晶體T2的臨界電壓Vth,因此可加速電晶體T2的閘極的電壓準位達到系統高電壓VDD1減去電晶體T2的臨界電壓Vth,進而可降低每一畫素PX1的取樣錯誤率。其中,取樣錯誤率為發光期間PE1中電晶體T2的閘極的實際電壓準位與預期的電壓準位的誤差值。
圖3為圖1依據本發明第一實施例的電源電路的電路示意圖。請參照圖1及圖3,在本實施例中,電源電路140a包括第一電源供應單元310及第一多工器320。第一電源供應單元310提供第一參考電壓VR1、第二參考電壓VR2及接地電壓GND,其中第二參考電壓VR2高於第一參考 電壓VR1。第一多工器320耦接第一電源供應單元310以接收第一參考電壓VR1及第二參考電壓VR2,且接收調整信號SA1。當調整信號SA1致能於調整系統高電壓VDD1的調整期間(如圖2A所示PA1)時(在此調整信號SA1的致能準位以高電壓準位為例),第一多工器320依據調整信號SA1輸出第二參考電壓VR2以作為系統高電壓VDD1;反之,當調整信號SA1為禁能時(在此調整信號SA1的禁能準位以低電壓準位為例),第一多工器320依據調整信號SA1輸出第一參考電壓VR1以作為系統高電壓VDD1。其中,調整信號SA1可以由一控制電路所產生,例如時序控制器110,但本發明實施例不以此為限。
進一步來說,在本實施例中,第一多工器320包括電晶體T6及T7(對應第六電晶體及第七電晶體),其中電晶體T6為P型電晶體,電晶體T7為N型電晶體。電晶體T6的源極(對應第一端)接收第一參考電壓VR1,電晶體T6的閘極(對應控制端)接收調整信號SA1,電晶體T6的汲極(對應第二端)耦接電晶體T2的源極。電晶體T7的汲極(對應第一端)接收第二參考電壓VR2,電晶體T7的閘極(對應控制端)接收調整信號SA1,電晶體T7的源極(對應第二端)耦接電晶體T2的源極。
當調整信號SA1為致能時(在此調整信號SA1的致能準位以高電壓準位為例),電晶體T6會不導通,而電晶體T7會導通,以致於第二參考電壓VR2會輸出至電晶體T2的源極作為系統高電壓VDD1;當調整信號SA1為 禁能時(在此調整信號SA1的禁能準位以低電壓準位為例),電晶體T6會導通,而電晶體T7會不導通,以致於第一參考電壓VR1會輸出至電晶體T2的源極作為系統高電壓VDD1。
圖4為圖1依據本發明第二實施例的畫素的電路示意圖。請參照圖1、圖3及圖4,在圖3的實施例中,多工器320為配置於電源電路140a中。在本實施例中,畫素PX2大致相同於畫素PX1所示,其不同之處在於將多工器320的電晶體T6及T7配置於畫素PX2中,亦即電源電路140可僅配置第一電源供應單元310,而其耦接關係可參照上述實施例,在此則不再贅述。
圖5A為依據本發明第三實施例的有機發光二極體顯示裝置的系統示意圖。請參照圖5A,在本實施例中,有機發光二極體顯示裝置500包括時序控制器510、掃描驅動器520、資料驅動器530、電源電路540及顯示面板550。掃描驅動器510耦接時序控制器510及顯示面板550,且受控於時序控制器510提供多個掃描信號SC2及多個發光信號SEM2至顯示面板550。資料驅動器530耦接時序控制器510及顯示面板550,且受控於時序控制器510提供多個資料電壓VDT2至顯示面板550。
電源電路540耦接顯示面板550,且提供系統高電壓VDD2(對應第二電壓)及系統低電壓VSS(對應第一電壓)至顯示面板550。顯示面板550具有多個畫素PX3,且每一畫素PX3接收系統高電壓VDD2、系統低電壓 VSS、對應的資料電壓VDT2、對應的掃描信號SC2及對應的發光信號SEM2。
每一畫素PX3包括多個電晶體T8~T12(對應第一電晶體至第五電晶體)、電容C2及有機發光二極體OLD2,其中電晶體T8~T12皆為N型電晶體。電晶體T8的汲極(對應第一端)接收對應的資料電壓VDT2,電晶體T8的閘極(對應控制端)接收對應的掃描信號SC2。電容C2的第一端耦接電晶體T8的源極(對應第二端)。電晶體T9的閘極(對應控制端)耦接電容C2的第二端。電晶體T10的源極(對應第一端)耦接電晶體T9的閘極,電晶體T10的閘極(對應控制端)接收對應的掃描信號SC2,電晶體T10的汲極(對應第二端)耦接電晶體T9的汲極(對應第二端)。電晶體T11的源極(對應第一端)耦接電晶體T9的汲極(對應第二端),電晶體T11的閘極(對應控制端)接收對應的發光信號SEM2,電晶體T11的汲極(對應第二端)接收系統高電壓VDD2。有機發光二極體OLD2的陽極耦接電晶體T9的源極(對應第一端),有機發光二極體OLD2的陰極耦接系統低電壓VSS。電晶體T12的汲極(對應第一端)接收初始電壓Vint2,電晶體T12的閘極(對應控制端)接收對應的發光信號SEM2,電晶體T12的汲極(對應第二端)耦接電容C2的第一端。其中,電晶體T9的源極透過有機發光二極體OLD2接收系統低電壓VSS。
在本實施例中,有機發光二極體OLD2順向耦接於電 晶體T9的源極與系統低電壓VSS之間,但在其他實施例中,有機發光二極體OLD2可順向耦接於系統高電壓VDD2與電晶體T11的汲極之間,亦即有機發光二極體OLD2與電晶體T9及T11串聯耦接於系統高電壓VDD2與系統低電壓VSS之間即可。
圖5B為圖5A依據本發明第三實施例的驅動波形示意圖。在此以單一畫素PX3為例,其中每一發光信號SEM2的電壓準位設定為相反於對應的掃描信號SC2。在程式化期間PP2中,掃描驅動器520會致能對應的掃描信號SC2(在此掃描信號SC2的致能準位以高電壓準位為例)且禁能對應的發光信號SEM2(在此發光信號SEM2的禁能準位以低電壓準位為例),並且資料驅動器530會設定對應的資料電壓VDT2的電壓準位。此時,電晶體T8及T10會受控於對應的掃描信號SC2而導通(on),電晶體T11及T12會受控於對應的發光信號SEM2而不導通(off)。其中,電晶體T9的閘極的電壓準位會高於系統低電壓VSS,且電晶體T9的閘極的電壓準位與系統低電壓VSS之間的壓差會大於等於電晶體T9的臨界電壓,因此電晶體T9會導通,並且電晶體T9的閘極的電壓準位會經由導通的電晶體T9及T10接收到系統低電壓VSS而開始放電並降低,以致於影響了電晶體T9的導通狀態,但電晶體T9的閘極的電壓準位與系統低電壓VSS之間的壓差仍會大於等於電晶體T9的臨界電壓。
在發光期間PE2中,掃描驅動器520會禁能對應的掃 描信號SC2(在此掃描信號SC2的禁能準位以低電壓準位為例)且致能對應的發光信號SEM2(在此發光信號SEM2的致能準位以高電壓準位為例),並且資料驅動器530會重置對應的資料電壓VDT2的電壓準位。此時,電晶體T8及T10會受控於對應的掃描信號SC2而不導通(off),電晶體T11及T12會受控於對應的發光信號SEM2而導通(on),其中電晶體T9的導通程度會對應於電晶體T9的閘極的電壓準位,而電晶體T9的閘極的電壓準位決定於初始電壓Vint2及電容C2的跨壓。
在本實施例中,為了加速電晶體T9的閘極的電壓準位達到系統低電壓VSS與電晶體T9的臨界電壓Vth的總和(即目標電壓),可控制電源電路540在調整期間PA2內調低系統低電壓VSS的電壓準位。其中,調整期間PA2在此設定為程式化期間PP2的一半,本發明實施例不以此為限,但調整期間PA2會小於程式化期間PP2。
圖6為圖5A依據本發明第三實施例的電源電路的電路示意圖。請參照圖5A及圖6,在本實施例中,電源電路540a包括第二電源供應單元610及第二多工器620。第二電源供應單元610提供第三參考電壓VR3、第四參考電壓VR4及系統高電壓VDD2,其中第四參考電壓VR4低於第三參考電壓VR3。第二多工器620耦接第二電源供應單元610以接收第三參考電壓VR3及第四參考電壓VR4,且接收調整信號SA2。當調整信號SA2致能於調整系統低電壓VSS的調整期間(如圖5B所示PA2)時(在此調整信號 SA2的致能準位以高電壓準位為例),第二多工器620依據調整信號SA2輸出第四參考電壓VR4以作為系統低電壓VSS;反之,當調整信號SA2為禁能時(在此調整信號SA2的禁能準位以低電壓準位為例),第二多工器620依據調整信號SA2輸出第三參考電壓VR3以作為系統低電壓VSS。其中,調整信號SA2可以由一控制電路所產生,例如時序控制器510,但本發明實施例不以此為限。
進一步來說,在本實施例中,第二多工器620包括電晶體T13及T14(對應第八電晶體及第九電晶體),其中電晶體T13為P型電晶體,電晶體T14為N型電晶體。電晶體T13的源極(對應第一端)接收第三參考電壓VR3,電晶體T13的閘極(對應控制端)接收調整信號SA2,電晶體T13的汲極(對應第二端)耦接有機發光二極體OLD2的陰極。電晶體T14的汲極(對應第一端)接收第四參考電壓VR4,電晶體T14的閘極(對應控制端)接收調整信號SA2,電晶體T14的源極(對應第二端)耦接有機發光二極體OLD2的陰極。
當調整信號SA2為致能時(在此調整信號SA2的致能準位以高電壓準位為例),電晶體T13會不導通,而電晶體T14會導通,以致於第四參考電壓VR4會輸出至耦接有機發光二極體OLD2的陰極作為系統低電壓VSS;當調整信號SA2為禁能時(在此調整信號SA2的禁能準位以低電壓準位為例),電晶體T13會導通,而電晶體T14會不導通,以致於第三參考電壓VR3會輸出至耦接有機發光 二極體OLD2的陰極作為系統低電壓VSS。
圖7為圖5A依據本發明第四實施例的畫素的電路示意圖。請參照圖5A、圖6及圖7,在圖6的實施例中,多工器620為配置於電源電路540a中。在本實施例中,畫素PX4大致相同於畫素PX3所示,其不同之處在於將多工器620的電晶體T13及T14配置於畫素PX4中,亦即電源電路540可僅配置第二電源供應單元610,而其耦接關係可參照上述實施例,在此則不再贅述。
在上述實施例中,為透過調整電壓的方式加速與有機發光二極體耦接的電晶體的閘極的電壓準位達到目標電壓,但在其他實施例中,亦可調整流進與有機發光二極體耦接的電晶體的電流來實現。
圖8為圖1依據本發明第一實施例的電源電路的電路示意圖。請參照圖1及圖8,在本實施例中,電源電路140b包括第三電源供應單元810及第三多工器820。第三電源供應單元810提供系統高電壓VDD1、參考電流IR1及接地電壓GND,其中參考電流IR1為一固定電流,並且可透過電流鏡或類似的方式來產生。第三多工器820耦接第三電源供應單元810以接收系統高電壓VDD1及參考電流IR1,且接收調整信號SA3。當調整信號SA3致能於調整系統高電壓VDD1的調整期間(如圖2A所示PA1)時(在此調整信號SA3的致能準位以高電壓準位為例),第三多工器820依據調整信號SA3輸出參考電流IR1;反之,當調整信號SA3為禁能時(在此調整信號SA3的禁能準位 以低電壓準位為例),第三多工器820依據調整信號SA3輸出系統高電壓VDD1。其中,調整信號SA3可以由一控制電路所產生,例如時序控制器110,但本發明實施例不以此為限。
進一步來說,在本實施例中,第三多工器820包括電晶體T15及T16(對應第十電晶體及第十一電晶體),其中電晶體T15為P型電晶體,電晶體T16為N型電晶體。電晶體T15的源極(對應第一端)接收系統高電壓VDD1,電晶體T15的閘極(對應控制端)接收調整信號SA3,電晶體T15的汲極(對應第二端)耦接電晶體T2的源極。電晶體T16的汲極(對應第一端)接收參考電流IR1,電晶體T16的閘極(對應控制端)接收調整信號SA3,電晶體T16的源極(對應第二端)耦接電晶體T2的源極。
當調整信號SA3為致能時(在此調整信號SA3的致能準位以高電壓準位為例),電晶體T15會不導通,而電晶體T16會導通,以致於參考電流IR1會輸出至電晶體T2的源極;當調整信號SA3為禁能時(在此調整信號SA3的禁能準位以低電壓準位為例),電晶體T15會導通,而電晶體T16會不導通,以致於系統高電壓VDD1會輸出至電晶體T2的源極。
圖9為圖1依據本發明第五實施例的畫素的電路示意圖。請參照圖1、圖8及圖9,在圖8的實施例中,多工器820為配置於電源電路140b中。在本實施例中,畫素PX5大致相同於畫素PX1所示,其不同之處在於將多工器820 的電晶體T15及T16配置於畫素PX5中,亦即電源電路140可僅配置第三電源供應單元810,而其耦接關係可參照上述實施例,在此則不再贅述。
綜上所述,本發明實施例的有機發光二極體顯示裝置,在程式化期間,調整系統高電壓或系統低電壓的電壓準位或電流,以加速耦接有機發光二極體的電晶體的閘極的電壓準位達到目標電壓。藉此,可降低每一畫素的取樣錯誤率,進而提升有機發光二極體顯示裝置的顯示品質。其中,取樣錯誤率為發光期間中耦接有機發光二極體的電晶體的閘極的實際電壓準位與預期的電壓準位的誤差值。
雖然本發明已以實施例揭露如上,然其並非用以限定本發明,任何所屬技術領域中具有通常知識者,在不脫離本發明之精神和範圍內,當可作些許之更動與潤飾,故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。
100、500‧‧‧有機發光二極體顯示裝置
110、510‧‧‧時序控制器
120、520‧‧‧掃描驅動器
130、530‧‧‧資料驅動器
140、140a、140b、540、540a‧‧‧電源電路
150、550‧‧‧顯示面板
210、220‧‧‧曲線
310‧‧‧第一電源供應單元
320‧‧‧第一多工器
610‧‧‧第二電源供應單元
620‧‧‧第二多工器
810‧‧‧第三電源供應單元
820‧‧‧第三多工器
C1、C2‧‧‧電容
GND‧‧‧接地電壓
Ic、Id1‧‧‧電流
IR1‧‧‧參考電流
OLD1、OLD2‧‧‧有機發光二極體
PA1、PA2‧‧‧調整期間
PE1、PE2‧‧‧發光期間
PP1、PP2‧‧‧程式化期間
PX1~PX5‧‧‧畫素
SA1、SA2、SA3‧‧‧調整信號
SC1、SC2‧‧‧掃描信號
SEM1、SEM2‧‧‧發光信號
T1~T16‧‧‧電晶體
VDD‧‧‧電壓準位
VDD1、VDD2‧‧‧系統高電壓
VDT1、VDT2‧‧‧資料電壓
Vint1、Vint2‧‧‧初始電壓
VR1‧‧‧第一參考電壓
VR2‧‧‧第二參考電壓
VR3‧‧‧第三參考電壓
VR4‧‧‧第四參考電壓
VSS‧‧‧系統低電壓
Vth‧‧‧臨界電壓
圖1為依據本發明第一實施例的有機發光二極體顯示裝置的系統示意圖。
圖2A為圖1依據本發明第一實施例的驅動波形示意圖。
圖2B為圖2A的畫素於程式化期間的等效示意圖。
圖2C為圖2B的系統高電壓提升及未提高時電晶體的閘極電壓曲線對比示意圖。
圖3為圖1依據本發明第一實施例的電源電路的電路 示意圖。
圖4為圖1依據本發明第二實施例的畫素的電路示意圖。
圖5A為依據本發明第三實施例的有機發光二極體顯示裝置的系統示意圖。
圖5B為圖5A依據本發明第三實施例的驅動波形示意圖。
圖6為圖5A依據本發明第三實施例的電源電路的電路示意圖。
圖7為圖5A依據本發明第四實施例的畫素的電路示意圖。
圖8為圖1依據本發明第一實施例的電源電路的電路示意圖。
圖9為圖1依據本發明第五實施例的畫素的電路示意圖。
100‧‧‧有機發光二極體顯示裝置
110‧‧‧時序控制器
120‧‧‧掃描驅動器
130‧‧‧資料驅動器
140‧‧‧電源電路
150‧‧‧顯示面板
C1‧‧‧電容
GND‧‧‧接地電壓
OLD1‧‧‧有機發光二極體
PX1‧‧‧畫素
SC1‧‧‧掃描信號
SEM1‧‧‧發光信號
T1~T5‧‧‧電晶體
VDD1‧‧‧系統高電壓
VDT1‧‧‧資料電壓
Vint1‧‧‧初始電壓

Claims (18)

  1. 一種有機發光二極體顯示裝置,包括:一電源電路,用以提供一第一電壓;以及一畫素,包括:一第一電晶體,該第一電晶體的第一端接收一資料電壓,該第一電晶體的控制端接收一掃描信號;一電容,該電容的第一端耦接該第一電晶體的第二端;一第二電晶體,該第二電晶體的第一端接收該第一電壓,該第二電晶體的控制端耦接該電容的第二端;一第三電晶體,該第三電晶體的第一端耦接該第二電晶體的控制端,該第三電晶體的控制端接收該掃描信號,該第三電晶體的第二端耦接該第二電晶體的第二端;一第四電晶體,該第四電晶體的第一端耦接該第二電晶體的第二端,該第四電晶體的控制端接收一發光信號;一有機發光二極體,與該第二電晶體及該第四電晶體串聯耦接於該第一電壓與一第二電壓之間;以及一第五電晶體,該第五電晶體的第一端接收一初始電壓,該第五電晶體的控制端接收該發光信號,該第五電晶體的第二端耦接該電容的第一端;其中,在一程式化期間,致能該掃描信號且禁能該發光信號,並且該電源電路調整該第一電壓的電壓準位或電流以加速該第二電晶體的控制端的電壓準位達到一目標電 壓。
  2. 如申請專利範圍第1項所述之有機發光二極體顯示裝置,其中調整該第一電壓的一調整期間小於該程式化期間。
  3. 如申請專利範圍第1項所述之有機發光二極體顯示裝置,其中當該第一電晶體、該第二電晶體、該第三電晶體、該第四電晶體及該第五電晶體分別為一P型電晶體時,該第一電壓為一系統高電壓,該第二電壓為一接地電壓。
  4. 如申請專利範圍第3項所述之有機發光二極體顯示裝置,其中該目標電壓為該系統高電壓減去該第二電晶體的一臨界電壓。
  5. 如申請專利範圍第3項所述之有機發光二極體顯示裝置,其中該電源電路包括:一第一電源供應單元,用以提供一第一參考電壓及一第二參考電壓,該第二參考電壓高於該第一參考電壓;一第一多工器,耦接該第一電源供應單元以接收該第一參考電壓及該第二參考電壓,且接收一調整信號,當該調整信號為致能時,該第一多工器依據該調整信號輸出該第二參考電壓以作為該系統高電壓,當該調整信號為禁能時,該第一多工器依據該調整信號輸出該第一參考電壓以作為該系統高電壓。
  6. 如申請專利範圍第5項所述之有機發光二極體顯示裝置,其中該調整信號致能於調整該系統高電壓的一調 整期間。
  7. 如申請專利範圍第5項所述之有機發光二極體顯示裝置,其中第一多工器包括:一第六電晶體,該第六電晶體的第一端接收該第一參考電壓,該第六電晶體的控制端接收該調整信號,該第六電晶體的第二端耦接該第二電晶體的第一端;以及一第七電晶體,該第七電晶體的第一端接收該第二參考電壓,該第七電晶體的控制端接收該調整信號,該第七電晶體的第二端耦接該第二電晶體的第一端;其中,該第六電晶體及第七電晶體分別為一P型電晶體及一N型電晶體。
  8. 如申請專利範圍第1項所述之有機發光二極體顯示裝置,其中當該第一電晶體、該第二電晶體、該第三電晶體、該第四電晶體及該第五電晶體分別為一N型電晶體時,該第一電壓為一系統低電壓,該第二電壓為一系統高電壓。
  9. 如申請專利範圍第8項所述之有機發光二極體顯示裝置,其中該目標電壓為該系統低電壓與該第二電晶體的一臨界電壓的總和。
  10. 如申請專利範圍第8項所述之有機發光二極體顯示裝置,其中該電源電路包括:一第二電源供應單元,用以提供一第三參考電壓及一第四參考電壓,該第四參考電壓低於該第三參考電壓;一第二多工器,耦接該第二電源供應單元以接收該第 三參考電壓及該第四參考電壓,且接收一調整信號,當該調整信號為致能時,該第二多工器依據該調整信號輸出該第四參考電壓以作為該系統低電壓,當該調整信號為禁能時,該第二多工器依據該調整信號輸出該第三參考電壓以作為該系統低電壓。
  11. 如申請專利範圍第10項所述之有機發光二極體顯示裝置,其中該調整信號致能於調整該系統低電壓的一調整期間。
  12. 如申請專利範圍第11項所述之有機發光二極體顯示裝置,其中第二多工器包括:一第八電晶體,該第八電晶體的第一端接收該第三參考電壓,該第八電晶體的控制端接收該調整信號,該第八電晶體的第二端耦接該第二電晶體的第一端;以及一第九電晶體,該第九電晶體的第一端接收該第四參考電壓,該第九電晶體的控制端接收該調整信號,該第九電晶體的第二端耦接該第二電晶體的第一端;其中,該第八電晶體及第九電晶體分別為一P型電晶體及一N型電晶體。
  13. 如申請專利範圍第1項所述之有機發光二極體顯示裝置,其中該電源電路包括:一第三電源供應單元,用以提供該第一電壓及一參考電流,該參考電流為一固定電流;一第三多工器,耦接該第三電源供應單元以接收該第一電壓及該參考電流,且接收一調整信號,當該調整信號 為致能時,該第三多工器依據該調整信號輸出該參考電流至該第二電晶體的第一端,當該調整信號為禁能時,該第三多工器依據該調整信號輸出該第一電壓至該第二電晶體的第一端。
  14. 如申請專利範圍第13項所述之有機發光二極體顯示裝置,其中該調整信號致能於調整該第一電壓的一調整期間。
  15. 如申請專利範圍第13項所述之有機發光二極體顯示裝置,其中第三多工器包括:一第十電晶體,該第十電晶體的第一端接收該第一電壓,該第十電晶體的控制端接收該調整信號,該第十電晶體的第二端耦接該第二電晶體的第一端;以及一第十一電晶體,該第十一電晶體的第一端接收該參考電流,該第十一電晶體的控制端接收該調整信號,該第十一電晶體的第二端耦接該第二電晶體的第一端;其中,該第十電晶體及第十一電晶體分別為一P型電晶體及一N型電晶體。
  16. 如申請專利範圍第1項所述之有機發光二極體顯示裝置,其中在一發光期間,禁能該掃描信號且致能該發光信號。
  17. 如申請專利範圍第1項所述之有機發光二極體顯示裝置,更包括一資料驅動器,用以提供該資料電壓。
  18. 如申請專利範圍第1項所述之有機發光二極體顯示裝置,更包括一掃描驅動器,用以提供該掃描信號及該發光信號。
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US14/945,404 US9524672B2 (en) 2012-09-21 2015-11-18 Organic light emitting diode display apparatus with power circuit to accelerate a voltage level
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