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TWI652665B - 像素驅動電路 - Google Patents

像素驅動電路 Download PDF

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Publication number
TWI652665B
TWI652665B TW107105664A TW107105664A TWI652665B TW I652665 B TWI652665 B TW I652665B TW 107105664 A TW107105664 A TW 107105664A TW 107105664 A TW107105664 A TW 107105664A TW I652665 B TWI652665 B TW I652665B
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transistor
terminal
signal
gate terminal
driving circuit
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TW107105664A
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English (en)
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TW201935452A (zh
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鄭貿薰
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友達光電股份有限公司
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Priority to TW107105664A priority Critical patent/TWI652665B/zh
Priority to CN201810408895.0A priority patent/CN108597451B/zh
Priority to US16/227,586 priority patent/US10672326B2/en
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Publication of TWI652665B publication Critical patent/TWI652665B/zh
Publication of TW201935452A publication Critical patent/TW201935452A/zh

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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
    • 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]
    • 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]
    • 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]
    • G09G3/3266—Details of drivers for scan electrodes
    • 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
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0465—Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
    • 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
    • G09G2300/0814—Several active elements per pixel in active matrix panels used for selection purposes, e.g. logical AND for partial update
    • 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
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • 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
    • G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving

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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)

Abstract

像素驅動電路具有第一電晶體，透過第一端或閘極端接收資料訊號。第二電晶體的第一端連接於第一電晶體的第一端，閘極端連接第二電晶體的第二端。第三電晶體的第二端連接第二電晶體的第二端，閘極端接收第一掃描訊號。第四電晶體的第一端連接第一電晶體的閘極端，閘極端接收第一掃描訊號。第五電晶體的第二端連接第一電晶體的第一端，閘極端接收第二掃描訊號。第六電晶體的第一端連接第一電晶體的第二端，閘極端接收第二掃描訊號。發光二極體的陽極端連接第六電晶體的第二端。電容連接第一電晶體的第一端與閘極端之間。

Description

像素驅動電路
本發明係關於一種像素驅動電路；具體而言，本發明係關於一種具有發光二極體顯示裝置的像素驅動電路。
一般而言，發光二極體顯示裝置中具有資料電路、掃描電路、像素驅動電路。像素驅動電路根據資料電路提供的資料訊號及掃描電路提供的掃描訊號驅動發光二極體發光。一般而言，發光二極體的驅動電流係與資料訊號及像素驅動電路中電晶體的臨界電壓有關；然而前述臨界電壓往往因製程因素存在偏異而影響發光二極體實際亮度。
為解決上述問題，現有的有機發光二極體顯示裝置或有提出像素驅動電路的改善設計以消除臨界電壓的影響。然而，現有的改善設計通常需要多個控制訊號，因此所需電路佈局面積較大且面板邊框的電路結構較為複雜。此外，現有的改善設計在電路操作時可能存在直流靜態電流路徑，這將造成額外的功率消耗。因此，現有有機發光二極體顯示裝置的電路結構仍有待改進。
像素驅動電路包含第一電晶體，透過第一端或閘極端接收資料訊號。第二電晶體的第一端連接於第一電晶體的第一端，閘極端連接第二電晶體的第二端。第三電晶體的第二端連接第二電晶體的第二端，閘極端接收第一掃描訊號。第四電晶體的第一端連接第一電晶體的閘極端，閘極端接收第一掃描訊號。第五電晶體的第二端連接第一電晶體的第一端，閘極端接收第二掃描訊號。第六電晶體的第一端連接第一電晶體的第二端，閘極端接收第二掃描訊號。發光二極體的陽極端連接第六電晶體的第二端。電容連接第一電晶體的第一端與閘極端之間。
本發明之一目的在於提供一種像素驅動電路，可提供穩定的驅動電流。
本發明之一目的在於提供一種像素驅動電路，可窄化顯示面板週邊區，並降低功率消耗。
10,10A,10B,10C,10D,10E‧‧‧像素驅動電路
102‧‧‧發光二極體
C‧‧‧電容
DATA‧‧‧資料訊號
EM‧‧‧掃描訊號
OVDD‧‧‧供應電壓
OVSS‧‧‧供應電壓
S‧‧‧掃描訊號
T1~T7‧‧‧電晶體
VREF‧‧‧參考訊號
圖1為本發明像素驅動電路之一實施例示意圖。
圖2為像素驅動電路的訊號示意圖。
圖3A及圖3B為對應圖2所繪示像素驅動電路於不同操作方式示意圖。
圖4及圖5為像素驅動電路具有單一掃描訊號之不同實施例示意圖。
圖6為像素驅動電路之另一實施例示意圖。
圖7及圖8為像素驅動電路具有單一掃描訊號之不同實施例示意圖。
以下將以圖式及詳細敘述清楚說明本揭示內容之精神，任何所屬技術領域中具有通常知識者在瞭解本揭示內容之實施例後，當可由本揭示內容所教示之技術，加以改變及修飾，其並不脫離本揭示內容之精神與範圍。
關於本文中所使用之『第一』、『第二』、...等，並非特別指稱次序或順位的意思，亦非用以限定本發明，其僅為了區別以相同技術用語描述的元件或操作。
關於本文中所使用之『電性耦接』，可指二或多個元件相互直接作實體或電性接觸，或是相互間接作實體或電性接觸，而『電性耦接』還可指二或多個元件相互操作或動作。
關於本文中所使用之『包含』、『包含』、『具有』、『含有』等等，均為開放性的用語，即意指包含但不限於。
關於本文中所使用之『及/或』，係包含所述事物的任一或全部組合。
關於本文中所使用之用詞(terms)，除有特別註明外，通常具有每個用詞使用在此領域中、在此揭露之內容中與特殊內容中的平常意義。某些用以描述本揭露之用詞將於下或在此說明書的別處討論，以提供本領域技術人員在有關本揭露之描述上額外的引導。
下文依本發明之像素驅動電路，特舉實施例配合所附圖式作詳細說明，但所提供之實施例並非用以限制本發明所涵蓋的範圍。
本發明係提供一種像素驅動電路，可用於例如有機發光二極體顯示器。請參考圖1，圖1為本發明像素驅動電路之一實施例示意圖。如圖1所示，像素驅動電路10可具有電晶體T1~T5及電晶體T7、電容C， 以及發光二極體102。上述電晶體T1~T5及T7，例如為薄膜電晶體，各電晶體包含包含第一端、第二端、閘極端。電晶體T4透過其第一端接收資料訊號。電晶體T2的第一端電性連接於電晶體T4的第一端，而閘極端則連接電晶體T2的第二端。電晶體T3的第一端接收第一電壓訊號，第二端連接第二電晶體的第二端。第三電晶體的閘極端接收掃描訊號S，並根據第一掃描訊號導通第三電晶體。在此實施例，第一電壓訊號為資料訊號DATA，且第二電壓訊號為參考訊號VREF，資料訊號DATA的電壓位準大於參考訊號VREF的電壓位準。電晶體T5的第一端電性連接電晶體T4的閘極端，第二端接收第二電壓訊號(VREF)。電晶體T5的閘極端接收掃描訊號S，並根據掃描訊號S導通電晶體T5。電晶體T1的第一端接收供應電壓OVDD，第二端電性連接電晶體T4的第一端。電晶體T1的閘極端接收另一掃描訊號EM。電晶體T7的第一端電性連接電晶體T4的第二端，而電晶體T7的閘極端接收掃描訊號EM。發光二極體102包含陽極端及陰極端。陽極端電性連接電晶體T7的第二端，陰極端接收另一供應電壓OVSS。電容C係電性連接於電晶體T4的第一端與閘極端之間。
像素驅動電路10的操作請一併參考圖2、圖3A、圖3B。圖2為像素驅動電路10的訊號示意圖。圖3A及圖3B為對應圖2所繪示像素驅動電路10於不同操作方式示意圖。如圖2所示，在期間D1，掃描訊號S自高電壓準位改變為低電壓準位，掃描訊號EM自低電壓準位改變為高電壓準位。如圖3A所示，此時電晶體T1與電晶體T7為關斷狀態，而電晶體T3與電晶體T5為導通狀態。電晶體T4的閘極端(A點)放電至VREF。電晶體T4的第一端(B點)於前一階段為具有供應電壓OVDD之高電位，在期間D1則放電至資料訊號DATA與電晶體T2臨界電壓之絕對值Vth_T2的和(亦即DATA+|Vth_T2|)。
接著如圖2所示，在期間D2，掃描訊號S自低電壓準位改變為高電壓準位，掃描訊號EM自高電壓準位改變為低電壓準位。如圖3B所示，此時電晶體T3與電晶體T5為關斷狀態，而電晶體T1與電晶體T7為導通狀態。電晶體T4的閘極端(A點)變成浮接狀態，電晶體T4的第一端(B點)充電到供應電壓OVDD之電壓值，藉此B點電壓變動量將直接反映在A點上。發光二極體102根據流經電晶體T1、T4、T7的驅動電流I發光。
舉例而言，B點電壓變動量例如為(OVDD-DATA-|Vth_T2|)，因此A點在期間D2具有(VREF+OVDD-DATA-|Vth_T2|)。此時電晶體T1的第一端(B點)電位為OVDD，閘極端(A點)電位為VREF+OVDD-DATA-|Vth_T2|。電容C於期間D2維持B點與A點的電壓差。故驅動電流符合：I=(1/2)k(DATA-VREF)2。應理解，驅動電流一般係與供應電壓以及驅動電晶體的臨界電壓值有關，而藉由前述實施例之設計，在驅動電流中消除了供應電壓及驅動電晶體臨界電壓值的影響。如此一來，可確保驅動電流不受製程偏異及供應電壓變化的影響，藉此可提供穩定的驅動電流，提高顯示品質。
在圖1、圖3A、圖3B繪示之實施例中，電晶體T2與電晶體T4為同類型電晶體，較佳具有相同的臨界電壓值(亦即Vth_T2=Vth_T4)，藉此同一像素內的驅動電晶體具有均勻的臨界電壓值，以於期間D1、D2提供操作穩定性。進一步而言，當電晶體T1~T5、T7為同類型電晶體(例如P型電晶體)時，掃描訊號S與掃描訊號EM的波型大體上反相，兩者形成互補的訊號。相較於現有技術掃描訊號的數量減少，藉此可簡化電路設計以減少電路佈局面積。
此外，於一實施例，像素驅動電路更包含電晶體T6。電晶體T6可以例如為薄膜電晶體，包含第一端、第二端、閘極端。如圖3A所 示，電晶體T6的第一端電性連接該電晶體T5的第二端，用以接收第二電壓訊號(VREF)，第二端電性連接發光二極體102的陽極端。電晶體T6的閘極端用以接收掃描訊號S。如圖2及圖3A，在期間D1，像素驅動電路10根據掃描訊號S導通電晶體T6並重置發光二極體102的陽極端。如圖3B所示，在期間D2，電晶體T6則為關斷狀態。藉此，在期間D1將發光二極體102的陽極端拉到一個低電位(VREF)，確保發光二極體102在期間D1不發光。於一實施例，參考訊號VREF係小於供應電壓OVSS與發光二極體102導通電壓之和，參考訊號VREF的位準例如可將設為等於供應電壓OVSS，但不限於此。
請參考圖4及圖5，圖4及圖5為本發明之另一實施例像素驅動電路10A之電路示意圖。其中電晶體元電的連接關係大體上相似。值得一提的是，與前述實施例的差異在於，圖4所繪示之像素驅動電路10A與圖5所繪示之像素驅動電路10B具有單一掃描訊號。請先看到圖4，如圖4所示，電晶體T1、T3、T5、T7的閘極端皆接收掃描訊號S，於另一實施例中，電晶體T6的閘極端亦接收掃描訊號S。詳言之，電晶體T1與電晶體T7為同類型電晶體(例如N型電晶體)。電晶體T3與電晶體T5為同類型電晶體，與電晶體T1具有不同類型(例如P型電晶體)時，掃描訊號整合為相同的掃描訊號源。藉此進一步簡化電路設計，減少電路佈局面積。於另一實施例，可採用電晶體T1、T7的閘極端所接收的掃描訊號與電晶體T3、T5的閘極端所接收的掃描訊號彼此獨立，但兩掃描訊號輸出波型大體上同相。
如圖5所示，於又一實施例中，電晶體T1、T3、T5、T7的閘極端皆接收掃描訊號EM，另外，電晶體T6的閘極端亦接收掃描訊號EM。詳言之，電晶體T1與電晶體T7為P型電晶體，而電晶體T3與電晶 體T5為N型電晶體，掃描訊號整合為相同的掃描訊號源。藉此進一步簡化電路設計，減少電路佈局面積。於另一實施例，可採用電晶體T1、T7的閘極端所接收的掃描訊號與電晶體T3、T5的閘極端所接收的掃描訊號彼此獨立，但兩掃描訊號輸出波型大體上同相。藉由上述電路設計可減少電路佈局面積，且在操作過程不會產生直流靜態電流路徑，可減少功率消耗。
圖6為像素驅動電路10C之另一實施例示意圖。如圖6所示，像素驅動電路10C包含電晶體T1~T5及電晶體T7、電容C，以及發光二極體102。電晶體T4透過其閘極端接收資料訊號DATA。電晶體T2的第一端電性連接於電晶體T4的第一端，而閘極端則連接電晶體T2的第二端。電晶體T3的第一端接收第一電壓訊號，第二端連接電晶體T2的第二端。電晶體T3的閘極端接收掃描訊號S，並根據掃描訊號S導通電晶體T3。在此實施例，第一電壓訊號為參考訊號VREF，且第二電壓訊號為資料訊號DATA，資料訊號DATA的電壓位準小於參考訊號VREF的電壓位準。電晶體T5的第一端電性連接電晶體T4的閘極端，第二端接收第二電壓訊號(DATA)。電晶體T5的閘極端接收掃描訊號S，並根據掃描訊號S導通電晶體T5。電晶體T1的第一端接收供應電壓OVDD，第二端電性連接電晶體T4的第一端。電晶體T1的閘極端接收另一掃描訊號EM。電晶體T7的第一端電性連接電晶體T4的第二端，而電晶體T7的閘極端接收掃描訊號EM。發光二極體102包含陽極端及陰極端。陽極端電性連接電晶體T7的第二端，陰極端接收另一供應電壓OVSS。電容係電性連接於電晶體T4的第一端與閘極端之間。
如上述，資料訊號DATA的電壓位準小於參考訊號VREF的電壓位準，舉例而言，此實施例中資料訊號DATA的電壓位準可設定為負值。類似地，採用如圖2所示的訊號操作，在期間D1，掃描訊號S自高電 壓準位改變為低電壓準位，掃描訊號EM自低電壓準位改變為高電壓準位。在期間D1，電晶體T1與電晶體T7為關斷狀態，而電晶體T3與電晶體T5為導通狀態。電晶體T4的閘極端(A點)放電至資料訊號DATA。電晶體T4的第一端(B點)於前一階段為具有供應電壓OVDD之高電位，在期間D1則放電至參考訊號與電晶體T2臨界電壓之絕對值Vth_T2的和(亦即VREF+|Vth_T2|)。
接著在期間D2，掃描訊號S自低電壓準位改變為高電壓準位，掃描訊號EM自高電壓準位改變為低電壓準位。在期間D2，電晶體T3與電晶體T5為關斷狀態，而電晶體T1與電晶體T7為導通狀態。電晶體T4的閘極端(A點)變成浮接狀態，電晶體T4的第一端(B點)充電到供應電壓OVDD之電壓值，藉此B點電壓變動量將直接反映在A點上。發光二極體102根據流經電晶體T1、T4、T7的驅動電流發光。
舉例而言，B點電壓變動量例如為(OVDD-VREF-|Vth_T2|)，因此A點在期間D2具有(DATA+OVDD-VREF-|Vth_T2|)。此時電晶體T1的第一端(B點)電位為OVDD，閘極端(A點)電位為DATA+OVDD-VREF-|Vth_T2|。電容C於期間D2維持B點與A點的電壓差。故驅動電流符合：I=(1/2)k(VREF-DATA)2。應理解，驅動電流一般係與供應電壓以及驅動電晶體的臨界電壓值有關，而藉由前述實施例之設計，在驅動電流中消除了供應電壓及驅動電晶體臨界電壓值的影響。如此一來，可確保驅動電流不受製程偏異及供應電壓變化的影響，藉此可提供穩定的驅動電流，提高顯示品質。
在圖6繪示之實施例中，電晶體T1與電晶體T2為同類型電晶體，較佳具有相同的臨界電壓值(亦即Vth_T2=Vth_T4)，藉此同一像素內的驅動電晶體具有均勻的臨界電壓值，以於期間D1、D2提供操作穩定性。 進一步而言，當電晶體T1~T5、T7為同類型電晶體(例如P型電晶體)時，掃描訊號S與掃描訊號EM的波型大體上反相，兩者形成互補的訊號。相較於現有技術掃描訊號的數量減少，藉此可簡化電路設計以減少電路佈局面積。
此外，於一實施例，像素驅動電路更包含電晶體T6。電晶體T6包含第一端、第二端、閘極端。如圖6所示，電晶體T6的第一端電性連接該電晶體T3的第一端，用以接收第一電壓訊號(VREF)，第二端電性連接發光二極體102的陽極端。電晶體T6的閘極端用以接收掃描訊號S。在期間D1，像素驅動電路10C根據掃描訊號S導通電晶體T6並重置發光二極體102的陽極端。在期間D2，電晶體T6則為關斷狀態。藉此，在期間D1將發光二極體102的陽極端拉到一個低電位(VREF)，確保發光二極體102在期間D1不發光。於一實施例，參考訊號VREF係小於OVSS與發光二極體導通電壓之和，例如可將設為OVSS，但不限於此。
圖7及圖8為像素驅動電路10D及像素驅動電路10E具有單一掃描訊號之不同實施例示意圖。與圖6實施例的差異在於，圖7所繪示之像素驅動電路10D與圖8所繪示之像素驅動電路10E具有單一掃描訊號。如圖7所示，電晶體T1、T3、T5、T7的閘極端皆接收掃描訊號S，另外，電晶體T6的閘極端亦接收掃描訊號S。詳言之，電晶體T1與電晶體T7為同類型電晶體(例如N型電晶體)。電晶體T3與電晶體T5為同類型電晶體且與電晶體T1具有不同類型(例如P型電晶體)時，掃描訊號整合為相同的掃描訊號源。藉此進一步簡化電路設計，減少電路佈局面積。於另一實施例，可採用電晶體T1、T7的閘極端所接收的掃描訊號與電晶體T3、T5的閘極端所接收的掃描訊號彼此獨立，但兩掃描訊號輸出波型大體上同相。
如圖8所示，電晶體T1、T3、T5、T7的閘極端皆接收掃描訊號EM，另外，電晶體T6的閘極端亦接收掃描訊號EM。詳言之，電晶體T1與電晶體T7為P型電晶體，而電晶體T3與電晶體T5為N型電晶體，掃描訊號整合為相同的掃描訊號源。藉此進一步簡化電路設計，減少電路佈局面積。於另一實施例，可採用電晶體T1、T7的閘極端所接收的掃描訊號與電晶體T3、T5的閘極端所接收的掃描訊號彼此獨立，但兩掃描訊號輸出波型大體上同相。藉由上述電路設計可減少電路佈局面積，且在操作過程不會產生直流靜態電流路徑，可減少功率消耗。
本發明已由上述相關實施例加以描述，然而上述實施例僅為實施本發明之範例。必需指出的是，已揭露之實施例並未限制本發明之範圍。相反地，包含於申請專利範圍之精神及範圍之修改及均等設置均包含於本發明之範圍內。

Claims (10)

  1. 一種像素驅動電路，包含：一第一電晶體，包含：一第一端；一第二端；一閘極端，該第一電晶體透過該第一端或該閘極端接收一資料訊號；一第二電晶體，包含：一第一端，電性連接於該第一電晶體的該第一端；一第二端；一閘極端，連接該第二電晶體的該第二端；一第三電晶體，包含：一第一端，接收一第一電壓訊號；一第二端，連接該第二電晶體的該第二端；一閘極端，接收一第一掃描訊號，並根據該第一掃描訊號導通該第三電晶體；一第四電晶體，包含：一第一端，電性連接該第一電晶體的該閘極端；一第二端，接收一第二電壓訊號；一閘極端，接收該第一掃描訊號，並根據該第一掃描訊號導通該第四電晶體；一第五電晶體，包含：一第一端，用以接收一第一供應電壓；一第二端，電性連接該第一電晶體的該第一端；一閘極端，用以接收一第二掃描訊號；一第六電晶體，包含：一第一端，電性連接該第一電晶體的該第二端；一第二端；一閘極端，用以接收該第二掃描訊號；一發光二極體，包含：一陽極端電性連接該第六電晶體的該第二端；一陰極端接收一第二供應電壓；以及一電容，電性連接於該第一電晶體的該第一端與該閘極端之間。
  2. 如請求項1所述之像素驅動電路，更包含一第七電晶體，包含：一第一端；一第二端，電性連接該發光二極體的該陽極端；一閘極端，用以接收該第一掃描訊號，根據該第一掃描訊號導通該第七電晶體並重置該發光二極體的該陽極端。
  3. 如請求項1所述之像素驅動電路，其中該第一電壓訊號為該資料訊號，且該第二電壓訊號為一參考訊號，該資料訊號的電壓位準大於該參考訊號的電壓位準。
  4. 如請求項3所述之像素驅動電路，更包含一第七電晶體，包含：一第一端，電性連接該第四電晶體的該第二端，用以接收該第二電壓訊號；一第二端，電性連接該發光二極體的該陽極端；一閘極端，用以接收該第一掃描訊號或該第二掃描訊號。
  5. 如請求項1所述之像素驅動電路，其中該第一電壓訊號為一參考訊號，且該第二電壓訊號為該資料訊號，該資料訊號的電壓位準小於該參考訊號的電壓位準。
  6. 如請求項5所述之像素驅動電路，更包含一第七電晶體，包含：一第一端，電性連接該第三電晶體的該第一端，用以接收該第一電壓訊號；一第二端，電性連接該發光二極體的該陽極端；一閘極端，用以接收該第一掃描訊號或該第二掃描訊號。
  7. 如請求項1所述之像素驅動電路，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、該第五電晶體與該第六電晶體為同類型電晶體時，該第一掃描訊號與該第二掃描訊號的波型大體上反相。
  8. 如請求項1所述之像素驅動電路，其中當該第五電晶體與該第六電晶體為同類型電晶體，該第三電晶體與該第四電晶體為同類型電晶體且與該第五電晶體具有不同類型時，該第一掃描訊號與該第二掃描訊號的波型大體上同相。
  9. 如請求項1所述之像素驅動電路，其中該第一電晶體與該第二電晶體為同類型電晶體。
  10. 如請求項1所述之像素驅動電路，其中當該第五電晶體與該第六電晶體為關斷狀態時，該第三電晶體與該第四電晶體為導通狀態。
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