TWI569247B - Active matrix organic light emitting diode pixel unit and its driving method, active matrix organic light emitting diode display device - Google Patents

Active matrix organic light emitting diode pixel unit and its driving method, active matrix organic light emitting diode display device Download PDF

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TWI569247B
TWI569247B TW104131858A TW104131858A TWI569247B TW I569247 B TWI569247 B TW I569247B TW 104131858 A TW104131858 A TW 104131858A TW 104131858 A TW104131858 A TW 104131858A TW I569247 B TWI569247 B TW I569247B
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transistor
scan control
light emitting
organic light
emitting diode
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TW104131858A
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TW201618069A (zh
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Nan Yang
Hui Zhu
si-ming Hu
Xiu-Qi Huang
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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
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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
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    • 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]
    • G09G3/3275—Details of drivers for data electrodes
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    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
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    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
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    • H10K59/131—Interconnections, e.g. wiring lines or terminals
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Description

主動式矩陣有機發光二極體像素單元及其驅動方法、主動式矩陣有機發光二極體顯示裝置
本發明有關於平板顯示裝置技術領域，特別有關於一種主動式矩陣有機發光二極體像素單元及其驅動方法、主動式矩陣有機發光二極體顯示裝置。
近年來，已經開發出相較於陰極射線管來說重量輕且體積小的各種類型的平板顯示裝置。在各種類型的平板顯示裝置中，由於主動式矩陣有機發光顯示裝置(AMOLED)使用自發光的有機發光二極體(OLED)來顯示圖像，通常具有回應時間短，使用低功率消耗進行驅動，相對更好的亮度和顏色純度的特性，所以有機發光顯示裝置已經成為下一代顯示裝置的焦點。
對於大型主動式矩陣有機發光顯示裝置，包括位於掃描線和資料線的交叉區域的多個像素。每個像素包括有機發光二極體和用於驅動該有機發光二極體的像素電路。像素電路通常包括開關電晶體、驅動電晶體和儲存電容器。主動式矩陣有機發光顯示裝置的像素的特性受到驅動電晶體之間的差異和開關電晶體的漏電流的不利因素的影響，因此藉由這樣的多個像素顯示的圖像的品質均勻性和一致性較差。
請參考圖1，其為主動式矩陣有機發光顯示裝置的傳統像素的電路圖。如圖1所示，主動式矩陣有機發光顯示裝置的傳 統像素10包括有機發光二極體(OLED)14，以及已經連接至資料線Dm和掃描控制線Sn以控制有機發光二極體(OLED)14的像素電路12。
具體的，像素電路12包括連接在第一電源ELVDD和有機發光二極體(OLED)14的陽極之間的第二電晶體M2(即驅動電晶體)、連接在第二電晶體M2的閘極和資料線Dm之間的第一電晶體M1(即開關電晶體)以及連接在第二電晶體M2的閘極與第一電源ELVDD之間的電容器Cs，其中第一電晶體M1的閘極連接至掃描控制線Sn。有機發光二極體(OLED)14的陽極連接至像素電路12，並且有機發光二極體(OLED)14的陰極連接至第二電源ELVSS。有機發光二極體(OLED)14發出具有與像素電路12所提供的電流對應的亮度的光。
當向掃描控制線Sn提供掃描信號時，像素電路12對應於資料線Dm供應的資料信號來控制供給有機發光二極體(OLED)14的電流量。具體的，第一電晶體M1的閘極連接至掃描控制線Sn，並且第一電晶體M1的源極(或汲極)連接至資料線Dm，第一電晶體M1的汲極(或源極)連接至電容器Cs的一個端子。當從掃描控制線Sn向第一電晶體M1提供掃描控制信號時，第一電晶體M1導通，並且從資料線Dm供應的資料信號被供給電容器Cs。電容器Cs的一個端子連接至第二電晶體M2的閘極，並且電容器Cs的另一個端子連接至第一電源ELVDD。與資料信號對應的電壓被充入到電容器Cs。此時，與資料信號對應的電壓被儲存到電容器Cs。
第二電晶體M2的閘極連接至電容器Cs的一個端子，並且第二電晶體M2的源極連接至第一電源ELVDD，第二電晶體M2 的汲極連接至有機發光二極體(OLED)14的陽極。第二電晶體M2對從第一電源ELVDD藉由有機發光二極體(OLED)14流到第二電源ELVSS的電流進行控制，該電流對應於儲存在電容器Cs中的電壓。
傳統像素10藉由對應於電容器Cs中所充入的電壓對有機發光二極體(OLED)14供應電流來控制有機發光二極體(OLED)14的亮度，顯示具有預定亮度的圖像。然而，在這種傳統的主動式矩陣有機發光顯示裝置中，由於第二電晶體M2的臨界值電壓變化和第一電晶體M1的漏電流，很難顯示具有均勻亮度的圖像。
例如在不同像素中由於第二電晶體M2的臨界值電壓的差異，使得在加入相同的閘極驅動電壓時流過有機發光二極體(OLED)的電流不一致，造成有機發光二極體(OLED)的亮度的不一致，各個像素回應同一資料信號，產生具有不同亮度的光，從而很難顯示具有均勻亮度的圖像。
本發明的目的在於提供一種主動式矩陣有機發光二極體像素單元及其驅動方法、主動式矩陣有機發光二極體顯示裝置，以解決現有的主動式矩陣有機發光二極體顯示裝置亮度不均勻的問題。
為解決上述技術問題，本發明提供一種主動式矩陣有機發光二極體像素單元，該主動式矩陣有機發光二極體像素單元用於與第一掃描控制線、第二掃描控制線、第三掃描控制線、第四掃描控制線及資料線連接，該主動式矩陣有機發光二極體像素單元包 括：像素電路及與該像素電路連接的有機發光二極體；該像素電路包括：電容器、與該電容器的一個端子連接的初始化單元、資料寫入單元及發光控制單元；其中，該電容器的另一個端子連接至第一掃描控制線，該初始化單元連接至第二掃描控制線，該資料寫入單元連接至第三掃描控制線及資料線，該發光控制單元連接至第四掃描控制線。
可任選的，在所述的主動式矩陣有機發光二極體像素單元中，該初始化單元包括第一電晶體及第七電晶體，該第一電晶體的源極/汲極與該第七電晶體的汲極/源極連接，該第一電晶體的閘極及該第七電晶體的閘極連接至第二掃描控制線，該第七電晶體的源極/汲極連接該電容器的該一個端子。
可任選的，在所述的主動式矩陣有機發光二極體像素單元中，該第一電晶體的汲極/源極連接至第三掃描控制線或者第一電源。
可任選的，在所述的主動式矩陣有機發光二極體像素單元中，該資料寫入單元包括第二電晶體、第三電晶體、第四電晶體及第八電晶體，該第二電晶體的源極/汲極與該第三電晶體的汲極/源極連接，該第二電晶體的汲極/源極連接至資料線，該第三電晶體的閘極與該第四電晶體的源極/汲極連接至該電容器的該一個端子，該第四電晶體的汲極/源極與該第八電晶體的源極/汲極連接，該第四電晶體的閘極及該第八電晶體的閘極連接至第三掃描控制線。
可任選的，在所述的主動式矩陣有機發光二極體像素單元中，該發光控制單元包括第五電晶體、第三電晶體及第六電晶 體，該第五電晶體的源極/汲極與該第三電晶體的汲極/源極連接，該第五電晶體的汲極/源極連接至第一電源，該第五電晶體的閘極連接至第四掃描控制線，該第三電晶體的源極/汲極與該第六電晶體的汲極/源極連接，該第六電晶體的閘極連接至第四掃描控制線。
可任選的，在所述的主動式矩陣有機發光二極體像素單元中，該有機發光二極體的陽極與該第六電晶體的源極/汲極連接，該有機發光二極體的陰極連接至第二電源，其中第一電源的電壓高於第二電源的電壓。
可任選的，在所述的主動式矩陣有機發光二極體像素單元中，該第一電晶體、第二電晶體、第三電晶體、第四電晶體、第五電晶體、第六電晶體、第七電晶體及第八電晶體均為PMOS電晶體或者均為NMOS電晶體。
本發明還提供一種主動式矩陣有機發光二極體像素單元的驅動方法，該主動式矩陣有機發光二極體像素單元的驅動方法包括：初始化階段：將掃描控制信號提供給第一掃描控制線及第二掃描控制線，初始化單元導通，對第三電晶體的閘極初始化；資料寫入階段：將掃描控制信號提供給第三掃描控制線，資料寫入單元導通，將資料信號對應的電壓儲存至電容器；以及發光階段：將掃描控制信號提供給第四掃描控制線，發光控制單元導通，使有機發光二極體發光。
可任選的，在所述的主動式矩陣有機發光二極體像素單元的驅動方法中，初始化階段：將掃描控制信號提供給第一掃描控制線及第二掃 描控制線，藉由第一電晶體和第七電晶體對第三電晶體的閘極初始化；資料寫入階段：將掃描控制信號提供給第三掃描控制線，藉由第二電晶體、第三電晶體、第四電晶體及第八電晶體將資料信號對應的電壓儲存至電容器；以及發光階段：將掃描控制信號提供給第四掃描控制線，藉由第五電晶體、第三電晶體及第六電晶體使有機發光二極體發光。
本發明還提供一種主動式矩陣有機發光二極體顯示裝置，包括：多個如上所述的主動式矩陣有機發光二極體像素單元，該主動式矩陣有機發光二極體顯示裝置還包括掃描驅動器及資料驅動器和多條資料線；多個主動式矩陣有機發光二極體像素單元以陣列排列，每個主動式矩陣有機發光二極體像素單元藉由第一掃描控制線、第二掃描控制線、第三掃描控制線及第四掃描控制線與該掃描驅動器連接，每個主動式矩陣有機發光二極體像素單元藉由資料線與該資料驅動器連接。在本發明提供的主動式矩陣有機發光二極體像素單元及其驅動方法、主動式矩陣有機發光二極體顯示裝置中，藉由初始化單元對第三電晶體的閘極初始化；藉由資料寫入單元將資料信號對應的電壓儲存至電容器；藉由發光控制單元實現有機發光二極體發光，由此避免漏電流或者臨界值電壓的差異對電容器的影響，使得主動式矩陣有機發光二極體顯示裝置亮度均勻。
10‧‧‧像素
12‧‧‧像素電路
14‧‧‧有機發光二極體(OLED)
20‧‧‧主動式矩陣有機發光二極體像素單元
22‧‧‧像素電路
24‧‧‧有機發光二極體(OLED)
30‧‧‧掃描控制器
40‧‧‧資料驅動器
Cs‧‧‧電容器
D1‧‧‧資料線
D2‧‧‧資料線
Dm‧‧‧資料線
ELVDD‧‧‧第一電源
ELVSS‧‧‧第二電源
M1‧‧‧第一電晶體
M2‧‧‧第二電晶體
M3‧‧‧第三電晶體
M4‧‧‧第四電晶體
M5‧‧‧第五電晶體
M6‧‧‧第六電晶體
M7‧‧‧第七電晶體
M8‧‧‧第八電晶體
N1‧‧‧節點
N2‧‧‧節點
N3‧‧‧節點
N4‧‧‧節點
S01‧‧‧第一掃描控制線
S02‧‧‧第二掃描控制線
S03‧‧‧第三掃描控制線
S04‧‧‧第四掃描控制線
S11‧‧‧第一掃描控制線
S12‧‧‧第二掃描控制線
S13‧‧‧第三掃描控制線
S14‧‧‧第四掃描控制線
Sn‧‧‧掃描控制線
Sn1‧‧‧第一掃描控制線
Sn2‧‧‧第二掃描控制線
Sn3‧‧‧第三掃描控制線
Sn4‧‧‧第四掃描控制線
圖1是主動式矩陣有機發光顯示裝置的傳統像素的電路圖；圖2是本發明一實施例的主動式矩陣有機發光二極體像素單元 的電路圖；圖3是本發明另一實施例的主動式矩陣有機發光二極體像素單元的電路圖；圖4是本發明的主動式矩陣有機發光二極體像素單元的驅動信號時序圖；以及圖5是本發明實施例的主動式矩陣有機發光二極體顯示裝置的框結構示意圖。
以下結合附圖和具體實施例對本發明提出的主動式矩陣有機發光二極體像素單元及其驅動方法、主動式矩陣有機發光二極體顯示裝置作進一步詳細說明。根據下面說明和請求項，本發明的優點和特徵將更清楚。需說明的是，附圖均採用非常簡化的形式且均使用非精準的比例，僅用以方便、清晰地輔助說明本發明實施例的目的。
請參考圖2，其為本發明一實施例的主動式矩陣有機發光二極體像素單元的電路圖。如圖2所示，該主動式矩陣有機發光二極體像素單元20與掃描控制線連接，該掃描控制線包括第一掃描控制線Sn1、第二掃描控制線Sn2、第三掃描控制線Sn3及第四掃描控制線Sn4，該主動式矩陣有機發光二極體像素單元20包括：像素電路22及與該像素電路22連接的有機發光二極體(OLED)24；該像素電路22包括：電容器Cs，與該電容器Cs的一個端子連接的初始化單元、資料寫入單元及發光控制單元；其中，該電容器Cs的另一個端子連接至第一掃描控制線Sn1，該初始化單元連接至第二掃描控制線Sn2，該資料寫入單元連接至第三掃描控制線Sn3及資料線 Dm，該發光控制單元連接至第四掃描控制線Sn4。
具體的，該初始化單元包括第一電晶體M1及第七電晶體M7，該第一電晶體M1的源極/汲極與該第七電晶體M7的汲極/源極連接(即該第一電晶體M1和該第七電晶體M7串聯)，該第一電晶體M1的閘極及該第七電晶體M7的閘極連接至第二掃描控制線Sn2，該第七電晶體M7的源極/汲極連接該電容器Cs的一個端子。在本申請實施例中，該第一電晶體M1的汲極/源極連接至第三掃描控制線Sn3，在本申請的另一實施例中，該第一電晶體M1的汲極/源極也可以連接至第一電源ELVDD，例如圖3中所示。
該資料寫入單元包括第二電晶體M2、第三電晶體M3、第四電晶體M4及第八電晶體M8，該第二電晶體M2的源極/汲極與該第三電晶體M3的汲極/源極連接，該第二電晶體M2的汲極/源極連接至資料線Dm，該第三電晶體M3的閘極與該第四電晶體M4的源極/汲極連接至該電容器的該一個端子，該第四電晶體M4的汲極/源極與該第八電晶體M8的源極/汲極連接(即該第四電晶體M4和該第八電晶體M8串聯)，該第四電晶體M4的閘極及該第八電晶體M8的閘極連接至第三掃描控制線Sn3。
該發光控制單元包括第五電晶體M5、第三電晶體M3及第六電晶體M6，該第五電晶體M5的源極/汲極與該第三電晶體M3的汲極/源極連接，該第五電晶體M5的汲極/源極連接至第一電源ELVDD，該第五電晶體M5的閘極連接至第四掃描控制線Sn4，該第三電晶體M3的源極/汲極與該第六電晶體M6的汲極/源極連接，該第六電晶體M6的閘極連接至第四掃描控制線Sn4。
為了便於描述該像素電路22中一些節點的電位變 化，將電容器Cs與第三電晶體M3、第四電晶體M4以及第七電晶體M7之間的連接點設為節點N1；將第二電晶體M2、第三電晶體M3以及第五電晶體M5之間的連接點設為節點N2；將第三電晶體M3、第六電晶體M6以及第八電晶體M8之間的連接點設為節點N3；將電容器Cs與第一掃描控制線Sn1之間的一連接點作為節點N4。
在本申請實施例中，該有機發光二極體24的陽極與該第六電晶體M6的源極/汲極連接，該有機發光二極體24的陰極連接至第二電源ELVSS，其中第一電源ELVDD的電壓高於第二電源ELVSS的電壓。
在本申請實施例中，該第一電晶體M1、第二電晶體M2、第三電晶體M3、第四電晶體M4、第五電晶體M5、第六電晶體M6、第七電晶體M7及第八電晶體M8均為PMOS電晶體或者均為NMOS電晶體。
接下去，將以該第一電晶體M1、第二電晶體M2、第三電晶體M3、第四電晶體M4、第五電晶體M5、第六電晶體M6、第七電晶體M7及第八電晶體M8均為PMOS電晶體為例，敘述主動式矩陣有機發光二極體像素單元20的工作狀態。
在本申請實施例中，該主動式矩陣有機發光二極體像素單元20的驅動方法包括：初始化階段：將掃描控制信號提供給第一掃描控制線及第二掃描控制線，初始化單元導通，對第三電晶體的閘極初始化；資料寫入階段：將掃描控制信號提供給第三掃描控制線，資料寫入單元導通，將資料信號對應的電壓儲存至電容器；以及發光階段：將掃描控制信號提供給第四掃描控制線，發光控制 單元導通，使有機發光二極體發光。
具體的，請結合圖4和圖2，其中，圖4為本發明實施例的主動式矩陣有機發光二極體像素單元的驅動信號時序圖，在此僅示出了一幀期間的驅動信號。
具體的，在設置為初始化階段的第一時間段t1期間，首先第一掃描控制線Sn1、第三掃描控制線Sn3、第四掃描控制線Sn4接入高電位信號，第二掃描控制線Sn2接入低電位信號；接著第二掃描控制線Sn2接入信號跳變為高電位信號，第一掃描控制線Sn1接入信號跳變為低電位信號。因此，藉由第一掃描控制線Sn1接入信號由低電位跳變為高電位時，節點N1電位拉高，節點N4電位變為高電位；第一電晶體M1和第七電晶體M7藉由第二掃描控制線Sn2接入低電位而導通，將第三掃描控制線Sn3接入的高電位信號提供給節點N1；接著第二掃描控制線Sn2接入信號變為高電位，第一電晶體M1和第七電晶體M7關斷；第一掃描控制線Sn1接入信號由高電位跳變為低電位時，利用電容器兩端電壓差暫態不能跳變原理，節點N1電位由高電位被拉低。
在第一時間段t1期間，可藉由第一電晶體M1和第七電晶體M7將節點N1電位拉高，利用電容器Cs耦合，再將節點N1電位拉低，從而在每一幀中第一節點N1可被恒定地復位。
接著，在設置為資料寫入階段的第二時間段t2期間，將第三掃描控制線Sn3接入低電位信號。由此，第二電晶體M2、第四電晶體M4和第八電晶體M8回應第三掃描控制線Sn3的低電位信號而導通。藉由第八電晶體M8和第四電晶體M4而使第三電晶體M3導通(在此，第三電晶體M3相當於一個二極體)。由於第一節點N1 在第一時間段t1期間被初始化，所以第三電晶體M3作為二極體被正向連接。
因此，經第二電晶體M2、第八電晶體M8和第四電晶體M4將提供給資料線Dm的資料信號Vm提供給第二節點N2。此時，由於第三電晶體M3被作為二極體連接，所以與資料信號Vm和第三電晶體M3的臨界值電壓之間的差值相應的電壓被提供給第一節點N1。提供給第二節點N2的電壓對電容器Cs充電。
接著，在設置為發光階段的第三時間段t3期間，第四掃描控制線Sn4接入信號由高電位跳變為低電位。由此，第五電晶體M5和第六電晶體M6藉由第四掃描控制線Sn4的接入信號而導通。因此，驅動電流沿第一電源ELVDD經第五電晶體M5、第三電晶體M3、第六電晶體M6和有機發光二極體(OLED)24的路徑流到第二電源ELVSS。即有機發光二極體(OLED)24發光。
這裡，第三電晶體M3回應於提供給第三電晶體M3的臨界值電壓相應的電壓儲存在電容器Cs中，所以在第二時間段t2期間對於第三電晶體M3的臨界值電壓進行補償。同時，在第三時間段t3期間，第一電晶體M1接入第三掃描控制線Sn3輸出的高電位(對於圖3中的主動式矩陣有機發光二極體像素單元而言，第一電晶體M1接入第一電源ELVDD，可任選的，第一電晶體M1還可以接入其他的高電位信號)，由於，在第三時間段t3期間，連接N1節點的電路主要有兩條漏電流支路，一條藉由第一電晶體M1、第七電晶體M7電晶體，另一條藉由第四電晶體M4、第八電晶體M8，而藉由第一電晶體M1(第一電晶體M1作為開關電晶體)的源極連接到一個高電位，由此可以降低N1節點的漏電流。此外，在將高電位掃描控 制信號提供給第四掃描控制線Sn4的時間段，即第一時間段t1和第二時間段t2期間，第六電晶體M6截止，從而可防止驅動電流被提供給有機發光二極體(OLED)24。
綜上可見，藉由初始化單元對驅動電晶體的閘極(即第三電晶體的閘極)初始化；藉由資料寫入單元將資料信號對應的電壓儲存至電容器；藉由發光控制單元實現有機發光二極體發光，由此避免漏電流或者臨界值電壓的差異對電容器的影響，從而能夠使得主動式矩陣有機發光二極體顯示裝置亮度均勻。
相應的，本實施例還提供一種主動式矩陣有機發光二極體顯示裝置。具體的，請參考圖5，其為本發明實施例的主動式矩陣有機發光二極體顯示裝置的框結構示意圖。如圖5所示，該主動式矩陣有機發光二極體顯示裝置包括：多個如上所述的主動式矩陣有機發光二極體像素單元20，掃描驅動器30及資料驅動器40；多個主動式矩陣有機發光二極體像素單元20以陣列排列，每個主動式矩陣有機發光二極體像素單元20藉由第一掃描控制線、第二掃描控制線、第三掃描控制線及第四掃描控制線(S01、S02、S03、S04、S11、S12、S13、S14......Sn1、Sn2、Sn3、Sn4)與該掃描驅動器30連接，每個主動式矩陣有機發光二極體像素單元20藉由資料線(D1、D2......Dm)與該資料驅動器40連接。
其中，掃描驅動器30產生與外部提供(例如，從定時控制單元提供)的掃描控制信號相應的掃描控制信號。將由掃描控制器30產生的掃描控制信號分別藉由第一掃描控制線、第二掃描控制線、第三掃描控制線及第四掃描控制線順序地提供給主動式矩陣有機發光二極體像素單元20。
資料驅動器40產生與外部提供(例如，從定時控制單元提供)的資料控制信號相應的資料信號。將由資料驅動器40產生的資料信號藉由資料線D1至Dm與掃描控制信號同步地提供給主動式矩陣有機發光二極體像素單元20。
每個主動式矩陣有機發光二極體像素單元20藉由初始化單元對第三電晶體的閘極初始化；藉由資料寫入單元將資料信號對應的電壓儲存至電容器；藉由發光控制單元實現有機發光二極體發光，由此避免漏電流或者臨界值電壓的差異對電容器的影響，從而可以最終使得主動式矩陣有機發光二極體顯示裝置亮度均勻。
上述描述僅是對本發明較佳實施例的描述，並非對本發明範圍的任何限定，本發明領域的普通技術人員根據上述揭示內容做的任何變更、修飾，均屬於請求項的保護範圍。
20‧‧‧主動式矩陣有機發光二極體像素單元
22‧‧‧像素電路
24‧‧‧有機發光二極體(OLED)
Cs‧‧‧電容器
Dm‧‧‧資料線
ELVDD‧‧‧第一電源
ELVSS‧‧‧第二電源
M1‧‧‧第一電晶體
M2‧‧‧第二電晶體
M3‧‧‧第三電晶體
M4‧‧‧第四電晶體
M5‧‧‧第五電晶體
M6‧‧‧第六電晶體
M7‧‧‧第七電晶體
M8‧‧‧第八電晶體
N1‧‧‧節點
N2‧‧‧節點
N3‧‧‧節點
N4‧‧‧節點
Sn1‧‧‧第一掃描控制線
Sn2‧‧‧第二掃描控制線
Sn3‧‧‧第三掃描控制線
Sn4‧‧‧第四掃描控制線

Claims (10)

  1. 一種主動式矩陣有機發光二極體像素單元，該主動式矩陣有機發光二極體像素單元用於與一第一掃描控制線、一第二掃描控制線、一第三掃描控制線、一第四掃描控制線及一資料線連接，該主動式矩陣有機發光二極體像素單元包括：一像素電路及與該像素電路連接的一有機發光二極體；該像素電路包括：一電容器、與該電容器的一個端子連接的一初始化單元、一資料寫入單元及一發光控制單元；該電容器的另一個端子連接至該第一掃描控制線，該初始化單元連接至該第二掃描控制線，該資料寫入單元連接至該第三掃描控制線及該資料線，該發光控制單元連接至該第四掃描控制線。
  2. 如請求項1之主動式矩陣有機發光二極體像素單元，其中，該初始化單元包括一第一電晶體及一第七電晶體，該第一電晶體的源極/汲極與該第七電晶體的汲極/源極連接，該第一電晶體的閘極及該第七電晶體的閘極連接至該第二掃描控制線，該第七電晶體的源極/汲極連接該電容器的該一個端子。
  3. 如請求項2之主動式矩陣有機發光二極體像素單元，其中，該第一電晶體的汲極/源極連接至該第三掃描控制線，或者該第一電晶體的汲極/源極連接至一第一電源。
  4. 如請求項2之主動式矩陣有機發光二極體像素單元，其中，該資料寫入單元包括一第二電晶體、一第三電晶體、一第四電晶體及一第八電晶體，該第二電晶體的源極/汲極與該第三電晶體的汲極/源極連接，該第二電晶體的汲極/源極連接至該資料線，該第三電晶體的閘極與該第四電晶體的源極/汲極連接至該電容器的該一個端子，該第四電晶體的汲極/源極與該第八電晶體的源極/汲極連接， 該第四電晶體的閘極及該第八電晶體的閘極連接至該第三掃描控制線。
  5. 如請求項4之主動式矩陣有機發光二極體像素單元，其中，該發光控制單元包括一第五電晶體、該第三電晶體及一第六電晶體，該第五電晶體的源極/汲極與該第三電晶體的汲極/源極連接，該第五電晶體的汲極/源極連接至該第一電源，該第五電晶體的閘極連接至該第四掃描控制線，該第三電晶體的源極/汲極與該第六電晶體的汲極/源極連接，該第六電晶體的閘極連接至該第四掃描控制線。
  6. 如請求項5之主動式矩陣有機發光二極體像素單元，其中，該有機發光二極體的陽極與該第六電晶體的源極/汲極連接，該有機發光二極體的陰極連接至一第二電源，其中該第一電源的電壓高於該第二電源的電壓。
  7. 如請求項6之主動式矩陣有機發光二極體像素單元，其中，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、該第六電晶體、該第七電晶體及該第八電晶體均為PMOS電晶體或者均為NMOS電晶體。
  8. 一種主動式矩陣有機發光二極體像素單元的驅動方法，其包括下列步驟：一初始化階段：將一掃描控制信號提供給一第一掃描控制線及一第二掃描控制線，一初始化單元導通，對一第三電晶體的閘極初始化；一資料寫入階段：將該掃描控制信號提供給一第三掃描控制線，一資料寫入單元導通，將一資料信號對應的電壓儲存至一電容器；以及 一發光階段：將該掃描控制信號提供給一第四掃描控制線，一發光控制單元導通，使一有機發光二極體發光。
  9. 如請求項8之主動式矩陣有機發光二極體像素單元的驅動方法，其中，該初始化階段：將該掃描控制信號提供給該第一掃描控制線及該第二掃描控制線，藉由一第一電晶體和一第七電晶體對一第三電晶體的閘極初始化；該資料寫入階段：將該掃描控制信號提供給該第三掃描控制線，藉由一第二電晶體、一第三電晶體、一第四電晶體及一第八電晶體將該資料信號對應的電壓儲存至該電容器；以及該發光階段：將該掃描控制信號提供給該第四掃描控制線，藉由一第五電晶體、該第三電晶體及一第六電晶體使該有機發光二極體發光。
  10. 一種主動式矩陣有機發光二極體顯示裝置，包括：複數個請求項1至7中任一項之主動式矩陣有機發光二極體像素單元，該主動式矩陣有機發光二極體顯示裝置還包括一掃描驅動器及一資料驅動器和複數條資料線；該複數個主動式矩陣有機發光二極體像素單元以陣列排列，每個主動式矩陣有機發光二極體像素單元藉由該第一掃描控制線、該第二掃描控制線、該第三掃描控制線及該第四掃描控制線與該掃描驅動器連接，每個主動式矩陣有機發光二極體像素單元藉由該資料線與該資料驅動器連接。
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US10453385B2 (en) 2019-10-22
KR20170066516A (ko) 2017-06-14
CN105448235B (zh) 2018-01-26
KR101930493B1 (ko) 2018-12-19
US20170213504A1 (en) 2017-07-27
JP6502482B2 (ja) 2019-04-17
CN105448235A (zh) 2016-03-30
TW201618069A (zh) 2016-05-16
EP3200180B1 (en) 2023-12-20
WO2016045590A1 (zh) 2016-03-31
JP2017531821A (ja) 2017-10-26
EP3200180A4 (en) 2017-09-13

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