TW201905884A - 資料驅動器及有機發光顯示裝置 - Google Patents

資料驅動器及有機發光顯示裝置

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Publication number
TW201905884A
TW201905884A TW106142266A TW106142266A TW201905884A TW 201905884 A TW201905884 A TW 201905884A TW 106142266 A TW106142266 A TW 106142266A TW 106142266 A TW106142266 A TW 106142266A TW 201905884 A TW201905884 A TW 201905884A
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Taiwan
Prior art keywords
data
compensation
voltage
latch
input
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TW106142266A
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English (en)
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TWI665653B (zh
Inventor
金泰勳
權奇泰
金奎珍
金池娥
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南韓商Lg顯示器股份有限公司
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    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • 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]
    • G09G3/3275Details of drivers for data electrodes
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • 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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    • G09G3/30Control 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
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    • 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]
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    • G09G3/3258Control 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 voltage across the light-emitting element
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • 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]
    • G09G3/3275Details of drivers for data electrodes
    • 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
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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    • GPHYSICS
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    • G09G2300/0828Several active elements per pixel in active matrix panels forming a digital to analog [D/A] conversion circuit
    • GPHYSICS
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    • G09G2310/0264Details of driving circuits
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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

本發明係關於一種資料驅動器及一種有機發光顯示裝置,該資料驅動器包括:一輸入單元,被配置以接收一輸入資料;一補償資料產生器,被配置以藉由將一補償值施加至該輸入資料產生一補償資料;一轉換器單元,被配置以將該輸入資料轉換為一影像資料電壓並將該補償資料轉換為一補償資料電壓;以及一輸出單元,被配置以將該影像資料電壓和該補償資料電壓分別輸出到該有機發光顯示裝置的一資料線。

Description

資料驅動器及有機發光顯示裝置
本發明係關於一種主動矩陣型有機發光顯示裝置。
主動矩陣型電致發光顯示裝置包括自發光有機發光二極體(Organic Light Emitting Diode,OLED),具有反應時間快、發光效率高、亮度高、視角寬的優點。
作為自發光元件的OLED包括:陽極電極;陰極電極;以及有機化合物層,形成在陽極電極與陰極電極之間。該有機化合物層包括電洞注入層HIL、電洞傳輸層HTL、發光層EML、電子傳輸層ETL以及電子注入層EIL。當驅動電壓施加至陽極電極及陰極電極時,穿越過電洞傳輸層HTL的電洞以及穿越過電子傳輸層ETL的電子移動至發光層EML並且形成激子。因此,發光層EML產生可見光。
有機發光顯示裝置包括驅動薄膜電晶體(Thin Flim Transistor,TFT),以控制在OLED中流動的驅動電流。驅動TFT較佳被設計為在每一個像素處具有相同的電特性,例如臨界電壓和遷移率。然而,由於製程條件和驅動環境,每一個像素的電特性並不一致。為此,根據相同資料電壓的驅動電流在每一個像素處是不同的,這導致像素之間的亮度差異。為了解決這個問題,具有一影像品質補償技術,其用於感測每一個像素中驅動TFT的特性參數(閾值、遷移率)並基於感測結果適當地補償輸入資料,以便減少亮度的不一致性。
影像品質補償技術的一種內部補償方法是控制像素結構和操作時序,以消除驅動TFT的電子特性在有機發光二極體發光時的影響。基本上,內部補償方法是當驅動TFT的閘極電壓以預定位準增加至飽和時,以源極跟隨方法執行採樣。為了使驅動TFT的閘極電壓達到預定的位準,需要足夠長的時 間。然而,由於顯示面板一般具有大螢幕和高解析度,所以對一條像素線進行採樣的時間會減少,因此不能平順地執行採樣操作。
根據一個實施例,提供一種用於有機發光顯示裝置的資料驅動器,該資料驅動器包括:一輸入單元,被配置以接收一輸入資料;一補償資料產生器,被配置以藉由將一補償值施加至該輸入資料產生一補償資料;一轉換器單元,被配置以將該輸入資料轉換為一影像資料電壓並將該補償資料轉換為一補償資料電壓;以及一輸出單元,被配置以將該影像資料電壓和該補償資料電壓分別輸出到該有機發光顯示裝置的一資料線。
根據另一個實施例,提供一種包括根據本發明實施例的資料驅動器的有機發光顯示裝置。
1H‧‧‧一個水平周期
10‧‧‧顯示面板
11‧‧‧時序控制器
12‧‧‧資料驅動器
13‧‧‧閘極驅動器
14‧‧‧資料線
15‧‧‧閘極線
100‧‧‧補償值設定單元
120‧‧‧補償資料產生器
BF‧‧‧輸出緩衝器
CC‧‧‧補償電路
Cst‧‧‧儲存電容器
DAC‧‧‧數位至類比轉換器
DAC1‧‧‧第一數位至類比轉換器
DAC2‧‧‧第二數位至類比轉換器
Data‧‧‧影像資料
DCLK‧‧‧點時脈訊號
DDC‧‧‧資料控制訊號
DE‧‧‧資料致能訊號
DL‧‧‧資料線
DT‧‧‧驅動薄膜電晶體
EM(n)‧‧‧第n發光訊號
GDC‧‧‧閘極控制訊號
GL‧‧‧閘極線
GND‧‧‧低電位電源線
Hsync‧‧‧水平同步訊號
INIT‧‧‧初始化電源線
Latch1‧‧‧第一鎖存器
Latch2‧‧‧第二鎖存器
Mdata‧‧‧補償資料
MLatch1‧‧‧第一補償鎖存器
MLatch2‧‧‧第二補償鎖存器
MVdata‧‧‧補償資料電壓
N1‧‧‧第一節點
N2‧‧‧第二節點
N3‧‧‧第三節點
N4‧‧‧第四節點
OLED‧‧‧有機發光二極體
P‧‧‧像素
S1‧‧‧第一控制訊號
S2‧‧‧第二控制訊號
SCAN(n)‧‧‧第(n)掃描訊號
SCAN(n-1)‧‧‧第(n-1)掃描訊號
SL1‧‧‧第一閘極線
SL2‧‧‧第二閘極線
SW‧‧‧開關電晶體
SW1‧‧‧第一開關
SW2‧‧‧第二開關
Te‧‧‧發光週期
Ti‧‧‧初始化週期
Ts‧‧‧採樣週期
Ts1‧‧‧第一採樣週期
Ts2‧‧‧第二採樣週期
T1‧‧‧第一電晶體
T2‧‧‧第二電晶體
T3‧‧‧第三電晶體
T4‧‧‧第四電晶體
T5‧‧‧第五電晶體
T6‧‧‧第六電晶體
Vdata‧‧‧資料電壓
VDD‧‧‧高電位驅動電壓
Vinit‧‧‧初始化電壓
Vsam、Vsat‧‧‧電壓
VSS‧‧‧低電位驅動電壓
Vsync‧‧‧垂直同步訊號
Vth‧‧‧臨界電壓
α‧‧‧補償值
△V‧‧‧採樣偏差
此等所附圖式,其包括於此構成本說明書之一部分,以提供本發明進一步瞭解,而說明本發明之實施例,且與此等說明一起用於解釋本發明之原理。在該些圖式中:圖1係說明根據本發明一實施例之有機發光顯示裝置的圖式;圖2係說明像素的示例的圖式;圖3係為根據本發明一實施例之像素的電路圖;圖4係說明用於驅動圖3所示之像素的閘極訊號的時序的圖式;圖5係說明圖3所示之第一節點的電壓變化的圖式;圖6係說明根據本發明第一實施例之資料驅動器的電路圖;圖7係說明圖6所示之第一控制訊號和第二控制訊號的時序的圖式;圖8係說明本發明第一實施例在初始化週期和採樣週期的第一節點的電壓變化的圖式;圖9係說明根據本發明第二實施例之資料驅動器的電路圖;以及圖10係根據本發明第三實施例之資料驅動器的電路圖。
現在參考本發明之實施例,並參考所附圖式作出詳細說明。在可能之處,相似的元件符號用於代表相同或相似的元件。需要注意的是,如果確定習知技術會誤解本發明的實施例,將忽略對習知技術的詳細描述。
以下將參照附圖對本發明的實施例進行說明。
圖1係說明根據本發明一實施例之有機發光顯示裝置的圖式。
參照圖1,根據本發明實施例的有機發光顯示裝置包括:顯示面板10;資料驅動器12;閘極驅動器13;以及時序控制器11。
複數條資料線14和複數條閘極線15在顯示面板10上相互交叉,並且像素P以矩陣形式設置在交叉處。每一個像素P從圖中未示出的電源供應器提供有高電位驅動電壓VDD和低電位驅動電壓VSS。
基於諸如垂直同步訊號Vsync、水平同步訊號Hsync、點時脈訊號DCLK和資料致能訊號DE的時序訊號,時序控制器11產生用於控制資料驅動器12之操作時序的資料控制訊號DDC以及用於控制閘極驅動器13之操作時序的閘極控制訊號GDC。
另外,時序控制器11包含補償值設定單元100。補償值設定單元100計算從資料驅動器12輸出的補償資料電壓的倍率。補償資料電壓是用於在感測週期感測驅動薄膜電晶體(Thin Flim Transistor,TFT)的臨界電壓的過程中的過驅動(Over Driving),並且稍後將提供其詳細描述。
在補償週期期間,資料驅動器12向像素P提供感測資料電壓、將通過資料線14從顯示面板10接收到的感測電壓轉換為數位值,並將該數位值提供給時序控制器11。在影像顯示週期期間,資料驅動器12將影像顯示資料電壓提供給資料線14。
閘極驅動器13可以基於來自時序控制器11的閘極控制訊號GDC產生閘極訊號,並且閘極訊號可以包括掃描訊號和發光訊號。根據像素結構,閘極訊號可以為不同的,並且在補償週期期間施加的閘極訊號和在影像顯示週期期間施加的閘極訊號的時序是不同的。閘極驅動器13可以通過板內閘極驅動器(Gate-driver In Panel,GIP)製程直接形成在顯示面板10上。
在圖2中,(a)和(b)係說明根據本發明一實施例之像素結構的示例。
參照圖2中的(a),一個像素包括:開關電晶體SW;驅動TFT DT;補償電路CC;以及有機發光二極體(Organic Light Emitting Diode,OLED)。由於驅動TFT DT所形成的驅動電流操作OLED以發光。
響應於通過第一閘極線GL提供的閘極訊號,開關電晶體SW執行開關操作,使得通過第一資料線DL所提供的資料訊號被儲存在電容器Cst中作為資料電壓。根據儲存在電容器Cst中的資料電壓,操作驅動TFT DT以使得驅動電流在高電位電源線VDD與低電位電源線GND之間流動。補償電路CC是用於補償驅動TFT DT的臨界電壓的電路。另外,連接到開關電晶體SW或驅動TFT DT的電容器Cst可以位於補償電路CC的內部。
補償電路CC包括一個或多個TFT以及一電容器。補償電路CC的配置可以根據補償方法而變化,並且在此省略其詳細示例和描述。
另外,如圖2的(b)所示,當包含補償電路CC時,像素還可以包括訊號線和電源線,以便在驅動補償TFT的同時提供特定的訊號或電源(圖中未示出)。該額外的訊號線可以被定義為用於驅動包含在像素中的補償TFT的第二閘極線SL2,並且在圖2(a)中的第一閘極線GL可以被定義為在圖2(b)中的第一閘極線SL1。另外,所增加的電源線可以被定義為用於將像素的特定節點初始化為特定電壓的初始化電源線INIT。然而,這些僅僅是示例性的,並且本發明不限於此。
圖3係說明執行內部補償的像素的示例的圖式。將在下文描述在圖3所示之在像素內實現的內部補償方法。
參照圖3,根據本發明一實施例的像素包含:驅動TFT DT;第一電晶體至第六電晶體T1至T6;以及儲存電容器Cst。
基於其源極-閘極電壓,驅動TFT DT控制將被施加到OLED的驅動電流。驅動TFT DT包含:閘極電極,連接到第一節點N1;源極電極,連接到第三節點N3;以及汲極電極,連接到第二節點N2。響應於第n掃描訊號SCAN(n),第一電晶體T1連接第一節點N1和第二節點N2。響應於第n掃描訊號SCAN(n),第二電晶體T2連接資料線14和第三節點N3。響應於第n發光訊號EM(n),第三電晶體T3連接第三節點N3和高電位驅動電壓VDD的輸入端子。響應於第n發光訊號EM(n),第四電晶體T4連接第二節點N2和第四節點N4。響應於第(n-1)掃描訊號SCAN(n-1),第五電晶體T5連接 第一節點N1和初始化電壓Vinit的輸入端子。響應於第n掃描訊號SCAN(n),第六電晶體T6連接初始化電壓Vinit的輸入端子和第四節點N4。另外,儲存電容器Cst連接在第一節點N1與高電位驅動電壓VDD的輸入端之間。
圖4係說明用於驅動圖3所示之像素的閘極訊號的時序的圖式。參考圖3和圖4,像素的操作如下所述。
在初始化週期Ti中,響應於第(n-1)掃描訊號SCAN(n-1),第五電晶體T5連接第一節點N1和初始化電壓Vinit的輸入端子。結果,第一節點N1被初始化為初始化電壓Vinit。初始化電壓Vinit可以被選擇在足以低於OLED的操作電壓的一電壓範圍內,並且可以被設置為等於或低於低電位驅動電壓VSS。
在採樣週期Ts中,第一電晶體T1、第二電晶體T2和第六電晶體T6響應於第n掃描訊號SCAN(n)而導通。結果,第一電晶體T1在第一節點N1與第二節點N2之間建立二極體連接。第二電晶體T2將第三節點N3充電至通過資料線14所提供的資料電壓Vdata。第六電晶體T6將第四節點N4充電至初始化電壓Vinit。
在採樣週期Ts中,電流在驅動TFT DT的源極電極與汲極電極之間流動,因此,第二節點N2的電壓變成Vdata-| Vth |,其代表將驅動TFT DT的臨界電壓Vth的絕對值從資料電壓Vdata減去所得之一數值。第一節點N1成為與第二節點N2相同的電壓。
在發光週期Te中,響應於第n發光訊號EM(n),第三電晶體T3將高電位驅動電壓VDD提供給第三節點N3。第四電晶體T4導通以連接第二節點N2和第四節點N4。在發光週期Te中,由於驅動TFT DT的一設定的閘極-源極電壓,產生從第三節點N3到第二節點N2的旁路的電流。
在發光週期Te中在OLED中流動的電流IOLED可以由等式1來說明,如下所示。
【等式1】IOLED=k/2(Vgs-Vth)2=k/2(Vg-Vs-Vth)2=k/2{(Vdata-|Vth|)-VDD-Vth)}2
此時,Vth<0,且因此,等式1可以總結為「k/2(Vdata-VDD)2」。
在等式1中,k/2代表由驅動TFT DT的電子遷移率、寄生電容和通道容量所確定的比例常數。在發光週期Te期間,流入OLED的驅動電流不受驅動TFT DT的臨界電壓Vth的影響。
為了排除在發光週期Te期間內部補償電路的操作中驅動TFT DT的臨界電壓Vth的影響的任何可能性,第一節點應該充分地被飽和在Vdata-| Vth |的一數值。
然而,隨著顯示面板10的解析度增加,用於驅動一條像素線的一個水平周期1H減少,據此,採樣週期Ts也減少。如圖5所示,如果在一個水平周期1H的採樣週期期間第一節點N1未能飽和到一足夠的數值時,則可能會有採樣偏差△V,這可能導致內部補償的誤差。
根據本發明的補償值設定單元100和資料驅動器12能夠在較短的採樣週期內更精確地採樣驅動TFT的臨界電壓。以下提供其描述。
時序控制器11設定用於產生補償資料電壓的補償值α。該補償值α可以計算為一比例值,該比例值為在一個水平週期1H的採樣週期中充入第一節點N1的電壓Vsam相對於第一節點N1處於一足夠長之採樣週期Ts時之飽和時的電壓值Vsat的比例值。也就是說,補償值α被計算為「Vsat/Vsam」。在第一水平週期1H期間在第一節點N1中改變的電壓Vsam等於或小於第一節點N1飽和的電壓值Vsat,因此補償值α大於1。補償值α可以針對每一個灰階設定為相同或不同。
圖1係說明補償值設定單元100被包含在時序控制器11中的示例,但是補償值設定單元100可以被包含在一額外的積體電路(Integrated Circuit,IC)中。
圖6係說明根據本發明第一實施例之資料驅動器的電路圖。圖6係說明將資料電壓輸出到一條資料線的示例。
參照圖6,根據第一實施例的資料驅動器12包括:鎖存單元Latch1、Latch2;第一開關SW1;第一數位至類比轉換器DAC1;補償資料產生器120;補償鎖存單元MLatch1、MLatch2;第二開關SW2;第二數位至類比轉換器DAC2;以及輸出緩衝器BF。鎖存單元Latch1、Latch2包含第一鎖存器Latch1和第二鎖存器Latch2,並且補償鎖存單元MLatch1、MLatch2包含第一補償鎖存器MLatch1和第二補償鎖存器MLatch2。
第一鎖存器Latch1採樣並鎖存從時序控制器11接收的數位影像資料Data,並同時輸出所有鎖存的資料。第二鎖存器Latch2鎖存從第一鎖存器Latch1接收的影像資料Data,並且同時輸出與其他源極驅動器的第二鎖存器Latch2同步之所有鎖存的影像資料。
響應於第一控制訊號S1,第一開關SW1連接第二鎖存器Latch2和第一數位至類比轉換器DAC1。
第一數位至類比轉換器DAC1將從第二鎖存器Latch2接收的影像資料Data轉換成類比資料電壓Vdata。
補償資料產生器120藉由將補償值α施加至從第一鎖存器Latch1接收的資料來產生補償資料Mdata。補償資料Mdata可以由資料乘以補償值α來產生。補償資料產生器120將補償資料Mdata輸出到第一補償鎖存器MLatch1。
第一補償鎖存器MLatch1採樣並鎖存從補償資料產生器120接收到的補償資料Mdata,並同時輸出所有鎖存的資料。
第二補償鎖存器MLatch2鎖存從第一補償鎖存器MLatch1接收到的補償資料Mdata,並同時輸出與其他源極驅動器的第二補償鎖存器MLatch2同步之所有鎖存的補償資料。
響應於第二控制訊號S2,第二開關SW2可以連接第二補償鎖存器MLatch2和第二數位至類比轉換器DAC2。
第二數位至類比轉換器DAC2將從第二補償鎖存器MLatch2接收的補償資料Mdata轉換成類比補償資料電壓MVdata。
輸出緩衝器BF向資料線DL提供來自第一數位至類比轉換器DAC1的資料電壓Vdata或來自第二數位至類比轉換器DAC2的補償資料電壓MVdata。
圖7係說明圖6所示之第一控制訊號和第二控制訊號的時序圖。圖8係說明根據本發明第一實施例在初始化週期和採樣週期中的第一節點的電壓變化的圖。第一實施例中之用於驅動像素的閘極訊號與比較範例的閘極訊號相同。也就是說,圖4所示的閘極訊號可以用於驅動圖3所示的像素。
參考圖3、圖4、圖6、圖8,以下描述通過補償資料電壓的使用的採樣操作。
在初始化週期Ti中,響應於第(n-1)掃描訊號SCAN(n-1),第五電晶體T5連接第一節點N1和初始化電壓Vinit的輸入端子。結果,第一節點N1被初始化為初始化電壓Vinit。初始化電壓Vinit可以被選擇為在足以低於OLED的操作電壓的電壓範圍內,並且可以被設定為等於或低於低電位驅動電壓VSS。
在第一採樣週期Ts1和第二採樣週期Ts2中,第一電晶體T1、第二電晶體T2和第六電晶體T6響應於第n掃描訊號SCAN(n)而導通。因此,第一電晶體T1在第一節點N1與第二節點N2之間建立二極體連接。
在第一採樣週期Ts1期間,第二控制訊號S2變成一導通電壓。結果,第二數位至類比轉換器DAC2從第二補償鎖存器MLatch2接收補償資料Mdata,並且產生補償資料電壓MVdata。在第一採樣週期Ts1期間,輸出緩衝器BF將補償資料電壓MVdata輸出到資料線DL。
第二電晶體T2將第三節點N3充電至通過資料線DL所提供的資料電壓Vdata。補償資料電壓MVata具有大於資料電壓Vdata的一數值,因此,在第一採樣週期Ts1期間,第三節點N3被充電到大於資料電壓Vdata的一數值。結果,由於過驅動效應,第一採樣週期Ts1中的第一節點N1的電壓具有大於充電到第三節點N3的資料電壓Vdata的一數值。
在第二採樣週期Ts2期間,第二控制訊號S2變為一截止電壓,並且第一控制訊號S1變成導通電壓。因此,第一數位至類比轉換器DAC1從第一鎖存器Latch1接收影像資料,並產生影像資料電壓Vdata。在第二採樣週期Ts2期間,輸出單元BF將影像資料電壓Vdata輸出到資料線DL。
第二電晶體T2將第三節點N3充電到通過資料線DL所提供的資料電壓。影像資料電壓Vdata具有小於補償資料電壓MVdata的一數值,因此在第二採樣週期Ts2期間將第一節點N1充電至電壓的速度減小。更詳細地說,因為影像資料電壓Vdata是與由時序控制器11接收的影像資料Data對應的電壓,所以可以在第二採樣週期Ts2之後將第一節點N1精確地採樣到具有Vdata-| Vth |之數值的電壓,該Vdata-| Vth |對應於所期望的灰階。
在發光週期Te中,由於驅動TFT DT的一設定的閘極-源極電壓,產生從第三節點N3到第二節點N2的旁路電流,並且OLED發出具有期望的灰階的光。
如上所述,根據本發明的資料驅動器12藉由使用施加了補償值α的補償資料電壓MVdata在第一採樣週期Ts1期間執行採樣操作,並且因此採樣操作可以很快地執行。因此,即使一個水平周期1H減少,但是驅動TFT DT的閘極-源極電壓可以在採樣週期期間被採樣為具有反映臨界電壓之精確值的電壓Vsat。也就是說,如果一個水平周期1H減少,則在採樣週期Ts1、Ts2期間,第一節點N1被充電到Vsam的電壓位準,因此,採樣操作可能被不準確地執行。然而,根據本發明,由於第一採樣週期Ts1的過驅動,可以將第一節點N1的電壓採樣到具有反映驅動TFT DT的臨界電壓之準確值的電壓Vsat。
具體來說,預期本發明在不增加驅動頻率的情況下具有過驅動效果。因此,如果簡單地通過增加資料電壓來執行採樣,則要採樣的電壓值可能會超過期望的位準。為了防止這個問題,需要將在採樣週期中施加的資料電壓控制在與輸入影像資料相對應的位準。然而,用於確定有機發光顯示裝置中的採樣週期的掃描訊號的脈衝寬度長度最小地對應於一個水平週期,因此,為了執行採樣兩次,需要增加驅動頻率。
反之,本發明被實現為使得資料驅動器12在一個水平週期1H內分別輸出影像資料Data的影像資料電壓Vdata以及反映補償值α的補償資料電壓MVdata。因此,可以在不增加驅動頻率並改變掃描訊號的時序的同時,執行過驅動。
圖9係說明根據本發明第二實施例之資料驅動器的電路圖。
參考圖9,根據本發明第二實施例的資料驅動器12包括:鎖存單元Latch1;第一開關SW1;第一數位至類比轉換器DAC1;補償資料產生器120;補償鎖存單元MLatch1;第二開關SW2;第二數位至類比轉換器DAC2;以及輸出緩衝器BF。即,在第二實施例中,鎖存單元Latch1和補償鎖存單元MLatch1中的每一個被實現為單個鎖存器。在第一實施例和第二實施例中的鎖存單元的數量可以根據資料驅動器的時序控制器的設計而變化。在第二實施例中,補償鎖存單元MLatch1的操作與第一實施例中描述的相同,資料驅動器輸出補償資料電壓的時序與第一實施例中描述的相同。
圖10係說明根據本發明第三實施例之資料驅動器的電路圖。
參照圖10,根據本發明第三實施例的資料驅動器12包括:鎖存單元Latch1、Latch2;第一開關SW1;補償資料產生器120;補償鎖存單元 MLatch1、MLatch2;第二開關SW2;數位至類比轉換器DAC;以及輸出緩衝器BF。鎖存單元Latch1、Latch2包含第一鎖存器Latch1和第二鎖存器Latch2,並且補償鎖存單元MLatch1,MLatch2包含第一補償鎖存器MLatch1和第二補償鎖存器MLatch2。當第一開關SW1導通時,數位至類比轉換器DAC將從第二鎖存器Latch2接收的影像資料Data轉換為類比資料電壓Vdata。當第二開關SW2導通時,數位至類比轉換器DAC將從第二補償鎖存器MLatch2接收到的補償資料Mdata轉換為類比補償資料電壓MVdata。
因此,在第三實施例中,可以在影像資料電壓Vdata或補償資料電壓MVdata之間選擇性地產生,並且藉由使用一個數位至類比轉換器DAC來輸出所選擇的電壓。
與第二實施例中相同,在圖10所示之鎖存單元和補償鎖存單元中的每一個可以被實現為單個鎖存器。
雖然本發明之實施例以示例性之實施例揭露如上,然而本領域之技術人員應當意識到在不脫離本發明所附之申請專利範圍所揭示之本發明之精神和範圍的情況下,所作之更動與潤飾,均屬本發明之專利保護範圍之內。尤其是,在本發明、圖式以及所附申請專利範圍的範圍內,對主題結合配置的組成部分及/或配置可作出各種變化與修飾。除對組成部分及/或配置做出的變化與修飾之外,可替代的用途對本領域技術人員而言將是顯而易見的。

Claims (11)

  1. 一種用於有機發光顯示裝置的資料驅動器,該資料驅動器包括:一輸入單元,被配置以接收一輸入資料;一補償資料產生器,被配置以藉由將一補償值施加至該輸入資料產生一補償資料;一轉換器單元,被配置以將該輸入資料轉換為一影像資料電壓並將該補償資料轉換為一補償資料電壓;以及一輸出單元,被配置以將該影像資料電壓和該補償資料電壓分別輸出到該有機發光顯示裝置的一資料線。
  2. 如申請專利範圍第1項所述之資料驅動器,其中,該輸出單元被配置以在一個水平周期內分別地輸出該影像資料電壓和該補償資料電壓,用於驅動該有機發光顯示裝置的一條像素線。
  3. 如申請專利範圍第1項所述之資料驅動器,其中,該補償資料產生器被配置以藉由將該補償值乘以該輸入資料來產生該補償資料。
  4. 如申請專利範圍第1項所述之資料驅動器,其中,從該有機發光顯示裝置的一時序控制器接收該輸入資料和該補償值。
  5. 如申請專利範圍第1項所述之資料驅動器,其中,該輸出單元包括一輸出緩衝器,該輸出緩衝器被配置以向該資料線施加該影像資料電壓或該補償資料電壓。
  6. 如申請專利範圍第1項所述之資料驅動器,其中,該轉換器單元包含:一第一數位至類比轉換器,用於將該輸入資料轉換成該影像資料電壓;以及一第二數位至類比轉換器,用於將該補償資料轉換成該補償資料電壓。
  7. 如申請專利範圍第1項所述之資料驅動器,其中,該轉換器單元包含: 一共用數位至類比轉換器,用於將該輸入資料轉換成該影像資料電壓並將該補償資料轉換成該補償資料電壓。
  8. 如申請專利範圍第1項所述之資料驅動器,其中,該輸入單元包含:一鎖存器,被配置以鎖存該輸入資料並將該輸入資料提供給該補償資料產生器。
  9. 如申請專利範圍第1項所述之資料驅動器,包括:至少一個輸入鎖存器,用於鎖存該輸入資料;以及至少一個補償鎖存器,用於鎖存該補償資料。
  10. 如申請專利範圍第9項所述之資料驅動器,進一步包括:一第一開關,被配置以連接該輸入鎖存器和該轉換器單元以響應一第一控制訊號;以及一第二開關,被配置以連接該補償鎖存器和該轉換器單元以響應一第二控制訊號。
  11. 一種有機發光顯示裝置,包括如申請專利範圍第1項至第10項中任一項所述之資料驅動器。
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