CN105609050B - 像素补偿电路及amoled显示装置 - Google Patents
像素补偿电路及amoled显示装置 Download PDFInfo
- Publication number
- CN105609050B CN105609050B CN201610004123.1A CN201610004123A CN105609050B CN 105609050 B CN105609050 B CN 105609050B CN 201610004123 A CN201610004123 A CN 201610004123A CN 105609050 B CN105609050 B CN 105609050B
- Authority
- CN
- China
- Prior art keywords
- transistor
- luminescent device
- electric capacity
- drain electrode
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229920001621 AMOLED Polymers 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000004020 luminiscence type Methods 0.000 claims abstract description 24
- 230000005611 electricity Effects 0.000 claims description 9
- 230000003287 optical effect Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- 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
- G09G3/3258—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 voltage across 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]
- 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
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0421—Structural details of the set of electrodes
- G09G2300/0426—Layout of electrodes and connections
-
- 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
- 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
-
- 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
- G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select 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
- G09G2300/08—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
- G09G2300/0871—Several active elements per pixel in active matrix panels with level shifting
-
- 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
- G09G2310/0254—Control of polarity reversal in general, other than for liquid crystal displays
- G09G2310/0256—Control of polarity reversal in general, other than for liquid crystal displays with the purpose of reversing the voltage across a light emitting or modulating element within a pixel
-
- 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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0238—Improving the black level
-
- 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
Landscapes
- 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
本发明涉及一种像素补偿电路及AMOLED显示装置。所述像素补偿电路包括数据信号写入模块、高电压写入模块、第一基准电压生成模块、驱动晶体管、电容和发光器件;所述数据信号写入模块在发光器件发光前与所述电容的第一端连接;所述高电压写入模块在发光器件发光过程中与电容的第一端连接;所述第一基准电压生成模块在发光器件发光前与电容的第二端、发光器件的阳极和驱动晶体管的漏极连接;所述驱动晶体管的栅极与电容的第二端连接,源极与高电压写入模块连接,漏极与发光器件的阳极连接;所述发光器件的阴极与公共接地电极连接。上述像素补偿电路可以避免发光器件在发光过程中的亮度发生变化,提高发光过程中的亮度均一性。
Description
技术领域
本发明涉及显示技术领域,具体地,涉及一种像素补偿电路及AMOLED显示装置。
背景技术
平面显示装置具有机身薄、省电、无辐射等众多优点,因而得到了广泛的应用。现有的平面显示装置主要包括液晶显示装置(LiquidCrystal Display,以下称为LCD)及有机发光二极管(Organic Light Emitting Diode,以下称为OLED)显示装置。
OLED显示装置通过自发光实现显示,因而其不需背光源,具有对比度高、厚度小、视角广、反应速度快、可被制成柔性显示面板、使用温度范围广、构造及制程较简单等优异特性,被视为可以取代LCD的下一代显示装置。
OLED按照驱动方式可以分为无源矩阵型OLED(Passive MatrixOLED,PMOLED)和有源矩阵型OLED(Active Matrix OLED,AMOLED)两大类,即直接寻址和薄膜晶体管(ThinFilm Transistor,TFT)矩阵寻址两类。其中,PMOLED的功耗较高,阻碍了其在大尺寸显示装置中的应用,所以PMOLED通常用作小尺寸的显示装置。而AMOLED因其高发光效能,通常用作高清晰度的大尺寸显示装置。
图1为现有的AMOLED像素电路的电路图。在AMOLED显示装置的显示区域内,像素被设置成包括多行、多列的矩阵状,每一像素通常采用由两个薄膜晶体管与一个电容(Capacitor)组成的像素电路进行驱动,即采用2T1C的驱动方式。具体地,第一晶体管T1的栅极电性连接栅线Scan,源极电性连接数据信号线DATA,漏极与第二晶体管T2的栅极及电容C的一端电性连接;第二晶体管T2的源极电性连接高电压信号端VDD,漏极电性连接有机发光二级管D的阳极;有机发光二级管D的阴极电性连接公共接地电极VSS;电容C的一端电性连接第一晶体管T1的漏极,另一端电性连接第二晶体管T2的源极。显示时,栅线Scan控制第一晶体管T1打开,数据信号线DATA的数据信号电压经过第一晶体管T1进入到第二晶体管T2的栅极及电容C,然后第一晶体管T1闭合,由于电容C作用,第二晶体管T2的栅极电压仍可继续保持数据信号电压,使得第二晶体管T2处于导通状态,高电压信号端VDD与数据信号电压对应的驱动电流通过第二晶体管T2进入有机发光二级管D,驱动有机发光二级管D发光。
上述AMOLED显示装置中,有机发光二极管D根据第二晶体管T2在饱和状态下产生的电流驱动;而由于TFT制程上的不均匀性,各像素中第二晶体管T2的临界电压不同,以及,由于第二晶体管T2的阈值电压Vth在有机发光二极管D发光过程中会发生不同程度的漂移,在采用上述2T1C驱动电路进行驱动时,各像素的亮度均一性很差,造成显示不均等不良。
发明内容
本发明旨在至少解决现有技术中存在的技术问题之一,提出了一种像素补偿电路及AMOLED显示装置,其可以避免发光器件在发光过程中的亮度发生变化,提高发光过程中的亮度均一性。
为实现本发明的目的而提供一种像素补偿电路,其包括数据信号写入模块、高电压写入模块、第一基准电压生成模块、驱动晶体管、电容和发光器件;所述数据信号写入模块在发光器件发光前与所述电容的第一端连接;所述高电压写入模块在发光器件发光过程中与电容的第一端连接;所述第一基准电压生成模块在发光器件发光前与电容的第二端、发光器件的阳极和驱动晶体管的漏极连接;所述驱动晶体管的栅极与电容的第二端连接,源极与高电压写入模块连接,漏极与发光器件的阳极连接;所述发光器件的阴极与公共接地电极连接。
其中,所述数据信号写入模块包括数据信号线和第一晶体管;所述第一晶体管的控制极与栅线连接,源极与数据信号线连接,漏极与所述电容的第一端连接。
其中,所述高电压写入模块包括高电压信号端和第二晶体管;所述第二晶体管的控制极与发光信号端连接,源极与高电压信号端连接,漏极与所述电容的第一端连接。
其中,所述第一基准电压生成模块包括基准电流端和第三晶体管、第四晶体管;所述第三晶体管的控制极与栅线连接,源极与基准电流端连接,漏极与第四晶体管的源极、驱动晶体管的漏极和发光器件的阳极连接;所述第四晶体管的控制极与栅线连接,漏极与所述电容的第二端连接。
其中,所述发光器件为OLED。
其中,所述像素补偿电路还包括电压清除模块,所述电压清除模块连接在驱动晶体管的漏极和发光器件的阳极之间,其用于向发光器件的阳极输入第二基准电压。
其中,所述电压清除模块包括第二基准电压信号端和第五晶体管、第六晶体管;所述第五晶体管的控制极与发光信号端连接,源极与驱动晶体管的漏极连接,漏极与发光器件的阳极连接;所述第六晶体管的控制极与栅线连接,源极与第二基准电压信号端连接,漏极与发光器件的阳极连接。
作为另一个技术方案,本发明还提供一种AMOLED显示装置,其包括上述像素补偿电路。
本发明具有以下有益效果:
本发明提供的像素补偿电路,其通过第一基准电压生成模块在发光器件发光前阶段向电容的第二端以及驱动晶体管的栅极写入电压,且该电压包含驱动晶体管的阈值电压;使发光器件的发光阶段,所生成的驱动电流与驱动晶体管的阈值电压无关,这样驱动晶体管的制程工艺的均匀性,以及其阈值电压在发光过程中的漂移不会对发光器件的发光亮度造成影响,从而可以避免发光器件在发光过程中的亮度发生变化,提高发光过程中的亮度均一性。而且,在发光器件的发光阶段,所述电容保持悬置状态,使其两端的电压差,即驱动晶体管的栅极和源极之间的差值保持不变,从而使所述驱动电流不会因高电压信号端的变化而变动,从而进一步避免发光器件在发光过程中的亮度发生变化,提高发光过程中的亮度均一性。
本发明提供的AMOLED显示装置,采用本发明提供的上述像素补偿电路,可以避免每个像素内的发光器件在一帧画面中的发光亮度发生变化,以及,避免各像素内的驱动晶体管的制程工艺造成各像素内发光器件发光亮度的不均匀,从而提高显示效果和显示均匀性。
附图说明
附图是用来提供对本发明的进一步理解,并且构成说明书的一部分,与下面的具体实施方式一起用于解释本发明,但并不构成对本发明的限制。在附图中:
图1为现有的AMOLED像素电路的电路图;
图2为本发明第一实施方式中像素补偿电路的电路图;
图3为图2所示像素补偿电路中各信号的时序图;
图4为t1阶段的等效电路图;
图5为t2阶段的等效电路图;
图6为本发明第二实施方式中像素补偿电路的电路图。
具体实施方式
以下结合附图对本发明的具体实施方式进行详细说明。应当理解的是,此处所描述的具体实施方式仅用于说明和解释本发明,并不用于限制本发明。
本发明提供一种像素补偿电路的多个实施方式。图2为本发明第一实施方式中像素补偿电路的电路图。如图2所示,在本实施方式中,所述像素补偿电路包括数据信号写入模块1、高电压写入模块2、第一基准电压生成模块3、驱动晶体管DTFT、电容C和发光器件4。所述数据信号写入模块1在发光器件4发光前与所述电容C的第一端连接;所述高电压写入模块2在发光器件4发光过程中与电容C的第一端连接;所述第一基准电压生成模块3在发光器件4发光前与电容C的第二端、发光器件的阳极和驱动晶体管DTFT的漏极连接;所述驱动晶体管DTFT的栅极与电容C的第二端连接,源极与高电压写入模块2连接,漏极与发光器件4的阳极连接;所述发光器件4的阴极与公共接地电极VSS连接。所述发光器件4具体可以为OLED(有机发光二极管)。
具体地,如图2所示,所述数据信号写入模块1包括数据信号线DATA和第一晶体管T1;所述第一晶体管T1的控制极(即栅极)与栅线Scan连接,源极与数据信号线DATA连接,漏极与所述电容C的第一端连接。所述高电压写入模块2包括高电压信号端VDD和第二晶体管T2;所述第二晶体管T2的控制极(即栅极)与发光信号端EM连接,源极与高电压信号端VDD连接,漏极与所述电容C的第一端连接。所述第一基准电压生成模块3包括基准电流端If和第三晶体管T3、第四晶体管T4;所述第三晶体管T3的控制极(即栅极)与栅线Scan连接,源极与基准电流端If连接,漏极与第四晶体管T4的源极、驱动晶体管DTFT的漏极、发光器件4的阳极连接;所述第四晶体管T4的控制极(即栅极)与栅线Scan连接,漏极与所述电容C的第二端连接。
在本实施方式中,所述第一晶体管T1、第二晶体管T2、第三晶体管T3、第四晶体管T4以及驱动晶体管DTFT为P型晶体管;在此情况下,各信号的时序如图3所示。下面结合图3所示的时序对图2所示像素补偿电路驱动发光器件发光的过程进行详细描述。
在第一阶段t1,该阶段为发光器件4不发光阶段;具体地,栅线Scan所输出的扫描信号为低电平,发光信号端EM输出的发光信号为高电平,数据信号线DATA输出的数据信号为高电平。在此情况下,第一晶体管T1开启,第二晶体管T2关闭,第三晶体管T3和第四晶体管T4开启,此时等效的电路图如图4所示。参看图4,数据信号线DATA与电容C的第一端连通,其将数据信号输入至电容C的第一端,使电容C的第一端的电压为VDATA;同时,高电压信号端VDD与驱动晶体管DTFT的源极连接,使驱动晶体管DTFT的源极的电压等于VDD。
而基准电流端If则与电容C的第二端连通,也即,与驱动晶体管DTFT的栅极连通。基准电流端If具有基准电流If,该基准电流If为设定值。在基准电流端If具有基准电流If的情况下,基准电流If满足以下公式(1):
If=k(Vgs-Vth)2·········(1)
其中,k为与驱动晶体管DTFT有关的常数;Vth为驱动晶体管DTFT的阈值电压;Vgs为驱动晶体管DTFT的栅极与源极之间的电压差,即Vgs=Vg-Vs,而Vg为驱动晶体管DTFT的栅极电压,Vs为驱动晶体管DTFT的源极电压。
而在t1阶段,驱动晶体管DTFT的源极电压为VDD,因此,上述公式(1)可以变换为下述公式(2):
If=k(Vg-VDD-Vth)2·········(2)
根据上述公式(2),可以计算得出驱动晶体管DTFT的栅极电压Vg:
该计算出的电压Vg即为t1阶段驱动晶体管DTFT的栅极的电压,即由基准电流端If写入到电容C的第二端上的电压。
在实际中,通过设定基准电流If的值,可以控制写入到电容C的第二端以及驱动晶体管DTFT的栅极的电压Vg的大小,使所述驱动晶体管DTFT的栅极在的t1阶段保持所需的电压。
如图4所示,在t1阶段,发光器件4的阳极也与基准电流端If,以及电容C的第二端连接,因此,所述电压Vg也会写入到发光器件4的阳极上,清除上一帧画面结束时发光器件4的阳极所保持的电压,从而使所述发光器件4在本帧画面中的发光亮度准确,而不会出现偏差。
根据上述内容,在t1阶段,电容C两端的电压差Δs为:
在第二阶段t2,该阶段为发光器件4的发光阶段;具体地,栅线Scan所输出的扫描信号为高电平,发光信号端EM所输出的发光信号为低电平,数据信号线DATA所输出的数据信号为低电平,在此情况下,第一晶体管T1关闭,第二晶体管T2开启,第三晶体管T3和第四晶体管T4关闭,此时等效的电路图如图5所示。参看图5,高电压信号端VDD与电容C的第一端连通,其向电容C的第一端写入电压,使电容C的第一端由VDATA变为VDD;此外,在本阶段,VDD还保持与驱动晶体管DTFT的源极的连接,因此,驱动晶体管DTFT的源极的电压保持为VDD。另一方面,在该t2阶段,电容C的第二端处于悬置(floating)状态,在电容C的第一端由VDATA变为VDD时,电容C第二端的电压会相应变化,以维持电容C两端的电压不变,即电容C两端的电压差Δs仍为:
而电容C第一端的电压与驱动晶体管DTFT的源极的电压相等,电容C第二端的电压与驱动晶体管DTFT的栅极的电压相等,因此,驱动晶体管DTFT的栅极和源极之间的电压差Vgs与上述Δs的值相等。
至此,可以得出,在该t2阶段,根据驱动晶体管DTFT而生成的用以驱动发光器件4发光的电流:
根据所述公式(5),驱动发光器件4发光的电流IOLED与驱动晶体管DTFT的阈值电压Vth无关,因此,驱动晶体管DTFT的制程工艺的均匀性,以及其阈值电压Vth在发光过程中的漂移不会对发光器件4的发光亮度造成影响,从而可以避免发光器件4在发光过程中的亮度发生变化,提高发光过程中的亮度均一性。
另外,在t2阶段,由于电容C处于floating状态,当高电压信号端VDD的电压变化时,驱动晶体管DTFT的栅极和源极之间的电压差Vgs会维持不变,从而所生成的驱动电流IOLED也不会因而VDD的电压变化而变动,从而可以进一步确保驱动电流IOLED保持稳定,避免发光器件4在发光过程中的亮度发生变化,提高发光过程中的均一性。
图6为本发明第二实施方式中像素补偿电路的电路图。如图6所示,与上述第一实施方式不同的是,本实施方式中,所述像素补偿电路还包括电压清除模块5,所述电压清除模块5连接在驱动晶体管DTFT的漏极和发光器件4的阳极之间,其用于向发光器件4的阳极输入第二基准电压Vi。
具体地,所述电压清除模块5包括第二基准电压信号端Vi和第五晶体管T5、第六晶体管T6;所述第五晶体管T5的控制极与发光信号端EM连接,源极与驱动晶体管DTFT的漏极连接,漏极与发光器件4的阳极连接;所述第六晶体管T6的控制极与栅线连接,源极与第二基准电压信号端Vi连接,漏极与发光器件4的阳极连接。
本实施方式中,各信号的时序与上述第一实施方式中各信号的时序相同。具体地,在t1阶段,第五晶体管T5关闭,第六晶体管T6开启,在此情况下,驱动晶体管DTFT和电容C的第二端,与发光器件4之间断开连接,第二基准电压信号端Vi与发光器件4的阳极连接,因此,在本实施方式中,t1阶段,输入至发光器件4的阳极,用以清除发光器件4的阳极在上一帧画面中的电压的为第二基准电压Vi,而不是上述第一实施方式中的电压Vg。
与上述第一实施方式相比,本实施方式中,采用单独的电压清除模块5在t1阶段清除发光器件4的阳极上的电压;使所述第一基准电压生成模块3只需向电容C的第二端写入电压,确保电容C两端的电压差Δs满足所述公式(4),而无需向发光器件4的阳极写入电压。首先,这样在确定基准电流If的值时,无需考虑清除发光器件4的阳极电压,从而可以更加容易地确定基准电流If的值;其次,这样就可以独立地控制电压清除模块5写入到发光器件4的阳极的电压,以及第一基准电压生成模块3写入到电容C的第二端的电压,控制方式更加简单,可靠性更高。
综上所述,本发明第一和第二实施方式提供的像素补偿电路,其通过第一基准电压生成模块3在发光器件4发光前阶段向电容C的第二端以及驱动晶体管DTFT的栅极写入电压,且该电压包含驱动晶体管DTFT的阈值电压Vth;使发光器件4的发光阶段,所生成的驱动电流与驱动晶体管DTFT的阈值电压无关,这样驱动晶体管DTFT的制程工艺的均匀性,以及其阈值电压Vth在发光过程中的漂移不会对发光器件4的发光亮度造成影响,从而可以避免发光器件4在发光过程中的亮度发生变化,提高发光过程中的亮度均一性。而且,在发光器件4的发光阶段,所述电容C保持悬置状态,使其两端的电压差,即驱动晶体管DTFT的栅极和源极之间的差值保持不变,从而使所述驱动电流不会因高电压信号端VDD的变化而变动,从而进一步避免发光器件4在发光过程中的亮度发生变化,提高发光过程中的亮度均一性。
作为另一个技术方案,本发明还提供一种AMOLED显示装置的实施方式。在本实施方式中,所述AMOLED显示装置包括上述第一或第二实施方式中所述的像素补偿电路。
本发明实施方式提供的AMOLED显示装置,采用本发明上述实施方式提供的像素补偿电路,可以避免每个像素内的发光器件在一帧画面中的发光亮度发生变化,以及,避免各像素内的驱动晶体管的制程工艺造成各像素内发光器件发光亮度的不均匀,从而提高显示效果和显示均匀性。
可以理解的是,以上实施方式仅仅是为了说明本发明的原理而采用的示例性实施方式,然而本发明并不局限于此。对于本领域内的普通技术人员而言,在不脱离本发明的精神和实质的情况下,可以做出各种变型和改进,这些变型和改进也视为本发明的保护范围。
Claims (7)
1.一种像素补偿电路,其特征在于,包括数据信号写入模块、高电压写入模块、第一基准电压生成模块、驱动晶体管、电容和发光器件;
所述数据信号写入模块在发光器件发光前与所述电容的第一端连接;所述高电压写入模块在发光器件发光过程中与电容的第一端连接;
所述第一基准电压生成模块在发光器件发光前与电容的第二端、发光器件的阳极和驱动晶体管的漏极连接;
所述驱动晶体管的栅极与电容的第二端连接,源极与高电压写入模块连接,漏极与发光器件的阳极连接;
所述发光器件的阴极与公共接地电极连接;
所述高电压写入模块包括高电压信号端和第二晶体管;所述第二晶体管的控制极与发光信号端连接,源极与高电压信号端连接,漏极与所述电容的第一端连接;所述第二晶体管的源极与所述驱动晶体管的源极连接。
2.根据权利要求1所述的像素补偿电路,其特征在于,所述数据信号写入模块包括数据信号线和第一晶体管;所述第一晶体管的控制极与栅线连接,源极与数据信号线连接,漏极与所述电容的第一端连接。
3.根据权利要求1所述的像素补偿电路,其特征在于,所述第一基准电压生成模块包括基准电流端和第三晶体管、第四晶体管;所述第三晶体管的控制极与栅线连接,源极与基准电流端连接,漏极与第四晶体管的源极、驱动晶体管的漏极和发光器件的阳极连接;所述第四晶体管的控制极与栅线连接,漏极与所述电容的第二端连接。
4.根据权利要求1所述的像素补偿电路,其特征在于,所述发光器件为OLED。
5.根据权利要求1所述的像素补偿电路,其特征在于,所述像素补偿电路还包括电压清除模块,所述电压清除模块连接在驱动晶体管的漏极和发光器件的阳极之间,其用于向发光器件的阳极输入第二基准电压。
6.根据权利要求5所述的像素补偿电路,其特征在于,所述电压清除模块包括第二基准电压信号端和第五晶体管、第六晶体管;所述第五晶体管的控制极与发光信号端连接,源极与驱动晶体管的漏极连接,漏极与发光器件的阳极连接;所述第六晶体管的控制极与栅线连接,源极与第二基准电压信号端连接,漏极与发光器件的阳极连接。
7.一种AMOLED显示装置,其特征在于,包括权利要求1~6任意一项所述的像素补偿电路。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201610004123.1A CN105609050B (zh) | 2016-01-04 | 2016-01-04 | 像素补偿电路及amoled显示装置 |
US15/503,101 US10192485B2 (en) | 2016-01-04 | 2016-07-04 | Pixel compensation circuit and AMOLED display device |
PCT/CN2016/088313 WO2017117939A1 (zh) | 2016-01-04 | 2016-07-04 | 像素补偿电路及amoled显示装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201610004123.1A CN105609050B (zh) | 2016-01-04 | 2016-01-04 | 像素补偿电路及amoled显示装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN105609050A CN105609050A (zh) | 2016-05-25 |
CN105609050B true CN105609050B (zh) | 2018-03-06 |
Family
ID=55988941
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201610004123.1A Active CN105609050B (zh) | 2016-01-04 | 2016-01-04 | 像素补偿电路及amoled显示装置 |
Country Status (3)
Country | Link |
---|---|
US (1) | US10192485B2 (zh) |
CN (1) | CN105609050B (zh) |
WO (1) | WO2017117939A1 (zh) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105609050B (zh) * | 2016-01-04 | 2018-03-06 | 京东方科技集团股份有限公司 | 像素补偿电路及amoled显示装置 |
TWI601279B (zh) * | 2016-08-22 | 2017-10-01 | 群創光電股份有限公司 | 發光二極體觸控顯示裝置 |
CN107799068B (zh) * | 2016-08-31 | 2020-09-11 | 乐金显示有限公司 | 有机发光显示器 |
CN106448567B (zh) * | 2016-12-08 | 2020-06-05 | 合肥鑫晟光电科技有限公司 | 像素驱动电路、驱动方法、像素单元和显示装置 |
CN106448557B (zh) * | 2016-12-26 | 2019-05-03 | 深圳市华星光电技术有限公司 | 发光驱动电路及有机发光显示器 |
CN106558287B (zh) * | 2017-01-25 | 2019-05-07 | 上海天马有机发光显示技术有限公司 | 有机发光像素驱动电路、驱动方法及有机发光显示面板 |
CN106940981A (zh) * | 2017-05-04 | 2017-07-11 | 成都晶砂科技有限公司 | 单晶硅晶体管cmos驱动显示的像素补偿电路及显示设备 |
CN107086024A (zh) * | 2017-05-04 | 2017-08-22 | 成都晶砂科技有限公司 | 单晶硅晶体管cmos驱动显示的像素补偿电路及显示设备 |
CN106940982A (zh) * | 2017-05-04 | 2017-07-11 | 成都晶砂科技有限公司 | 单晶硅cmos晶体管驱动显示的像素补偿电路 |
CN107274825B (zh) * | 2017-08-18 | 2020-11-24 | 上海天马微电子有限公司 | 显示面板、显示装置、像素驱动电路及其控制方法 |
CN107945764B (zh) * | 2018-01-08 | 2020-06-09 | 惠科股份有限公司 | 显示面板的驱动电路、显示装置及显示面板的驱动方法 |
CN108538247A (zh) | 2018-04-23 | 2018-09-14 | 京东方科技集团股份有限公司 | 像素电路及其驱动方法、显示面板和显示设备 |
CN108695370B (zh) * | 2018-05-21 | 2021-10-22 | 京东方科技集团股份有限公司 | Oled基板及制作方法、显示装置 |
JP7344892B2 (ja) * | 2018-09-12 | 2023-09-14 | 株式会社半導体エネルギー研究所 | 表示装置 |
US11227536B2 (en) | 2019-03-22 | 2022-01-18 | Apple Inc. | Systems and methods for performing in-frame cleaning |
US11442572B2 (en) | 2019-10-17 | 2022-09-13 | Samsung Electronics Co., Ltd. | Touch display controller and touch display system including the same |
CN110956923B (zh) * | 2019-12-24 | 2021-05-07 | 上海奕瑞光电子科技股份有限公司 | 低温多晶硅平板探测器像素电路及平板探测方法 |
TW202211195A (zh) | 2020-08-12 | 2022-03-16 | 日商半導體能源研究所股份有限公司 | 顯示裝置、其工作方法以及電子裝置 |
CN114203061A (zh) * | 2021-11-09 | 2022-03-18 | 北京奕斯伟计算技术有限公司 | 显示面板及其驱动方法、显示装置 |
Family Cites Families (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI273541B (en) * | 2003-09-08 | 2007-02-11 | Tpo Displays Corp | Circuit and method for driving active matrix OLED pixel with threshold voltage compensation |
CA2490848A1 (en) * | 2004-11-16 | 2006-05-16 | Arokia Nathan | Pixel circuit and driving method for fast compensated programming of amoled displays |
EP2383721B1 (en) | 2004-11-16 | 2015-04-08 | Ignis Innovation Inc. | System and Driving Method for Active Matrix Light Emitting Device Display |
CA2523841C (en) | 2004-11-16 | 2007-08-07 | Ignis Innovation Inc. | System and driving method for active matrix light emitting device display |
CA2503283A1 (en) | 2005-04-08 | 2006-10-08 | Ignis Innovation Inc. | Method for scaled current programming of amoled displays |
JP2006285116A (ja) * | 2005-04-05 | 2006-10-19 | Eastman Kodak Co | 駆動回路 |
KR101194861B1 (ko) * | 2006-06-01 | 2012-10-26 | 엘지디스플레이 주식회사 | 유기발광다이오드 표시소자 |
KR20100134125A (ko) | 2008-04-18 | 2010-12-22 | 이그니스 이노베이션 인크. | 발광 소자 디스플레이에 대한 시스템 및 구동 방법 |
CA2686497A1 (en) * | 2008-12-09 | 2010-02-15 | Ignis Innovation Inc. | Low power circuit and driving method for emissive displays |
KR101056228B1 (ko) * | 2009-03-02 | 2011-08-11 | 삼성모바일디스플레이주식회사 | 유기전계발광 표시장치 |
TW201316315A (zh) * | 2011-10-05 | 2013-04-16 | Wintek Corp | 發光元件驅動電路及其相關的畫素電路與應用 |
KR101463651B1 (ko) * | 2011-10-12 | 2014-11-20 | 엘지디스플레이 주식회사 | 유기발광 표시장치 |
KR20140067583A (ko) | 2012-11-27 | 2014-06-05 | 엘지디스플레이 주식회사 | 유기 발광 다이오드 표시장치 및 그 구동 방법 |
CN103021333B (zh) * | 2012-12-11 | 2016-01-20 | 昆山工研院新型平板显示技术中心有限公司 | 有机发光显示器的像素电路及其驱动方法 |
CN103474022A (zh) * | 2013-08-22 | 2013-12-25 | 京东方科技集团股份有限公司 | 一种像素电路及其驱动方法、阵列基板和显示装置 |
CN103839520B (zh) * | 2014-02-28 | 2017-01-18 | 京东方科技集团股份有限公司 | 像素电路及其驱动方法、显示面板和显示装置 |
CN203882588U (zh) * | 2014-06-13 | 2014-10-15 | 京东方科技集团股份有限公司 | 像素驱动电路、阵列基板及显示装置 |
CN103996379B (zh) * | 2014-06-16 | 2016-05-04 | 深圳市华星光电技术有限公司 | 有机发光二极管的像素驱动电路及像素驱动方法 |
CN104078005B (zh) * | 2014-06-25 | 2017-06-09 | 京东方科技集团股份有限公司 | 像素电路及其驱动方法和显示装置 |
CN104091563B (zh) * | 2014-06-27 | 2016-03-09 | 京东方科技集团股份有限公司 | 像素电路及其驱动方法、有机发光显示面板及显示装置 |
CN104318898B (zh) * | 2014-11-11 | 2017-12-08 | 京东方科技集团股份有限公司 | 像素电路、驱动方法和显示装置 |
CN104680977A (zh) * | 2015-03-03 | 2015-06-03 | 友达光电股份有限公司 | 一种用于高分辨率amoled的像素补偿电路 |
CN104732926B (zh) * | 2015-04-03 | 2017-03-22 | 京东方科技集团股份有限公司 | 一种像素电路、有机电致发光显示面板及显示装置 |
CN104751799B (zh) * | 2015-04-10 | 2016-12-14 | 京东方科技集团股份有限公司 | 像素电路及其驱动方法、显示装置 |
CN106710516A (zh) * | 2015-08-26 | 2017-05-24 | 上海和辉光电有限公司 | 显示装置、像素驱动电路及其驱动方法 |
CN105118438B (zh) * | 2015-09-21 | 2017-07-25 | 京东方科技集团股份有限公司 | 像素驱动电路、方法、像素电路和显示装置 |
TWI566222B (zh) * | 2015-12-08 | 2017-01-11 | 友達光電股份有限公司 | 顯示裝置及其控制方法 |
CN105609050B (zh) * | 2016-01-04 | 2018-03-06 | 京东方科技集团股份有限公司 | 像素补偿电路及amoled显示装置 |
CN105448244B (zh) | 2016-01-04 | 2018-04-06 | 京东方科技集团股份有限公司 | 像素补偿电路及amoled显示装置 |
-
2016
- 2016-01-04 CN CN201610004123.1A patent/CN105609050B/zh active Active
- 2016-07-04 WO PCT/CN2016/088313 patent/WO2017117939A1/zh active Application Filing
- 2016-07-04 US US15/503,101 patent/US10192485B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
WO2017117939A1 (zh) | 2017-07-13 |
US20180114487A1 (en) | 2018-04-26 |
CN105609050A (zh) | 2016-05-25 |
US10192485B2 (en) | 2019-01-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN105609050B (zh) | 像素补偿电路及amoled显示装置 | |
CN105448244B (zh) | 像素补偿电路及amoled显示装置 | |
US20240119897A1 (en) | Pixel Circuit and Driving Method Therefor and Display Panel | |
CN107068060B (zh) | Amoled像素驱动电路及像素驱动方法 | |
CN105427809B (zh) | 像素补偿电路及amoled显示装置 | |
CN104658482B (zh) | Amoled像素驱动电路及像素驱动方法 | |
CN204680360U (zh) | 一种像素电路及显示装置 | |
US9472135B2 (en) | AMOLED (active matrix organic light emitting diode) panel driving circuit and driving method | |
CN107358915A (zh) | 一种像素电路、其驱动方法、显示面板及显示装置 | |
CN106504701B (zh) | Amoled像素驱动电路及像素驱动方法 | |
WO2015188533A1 (zh) | 像素驱动电路、驱动方法、阵列基板及显示装置 | |
KR20140071600A (ko) | 화소 회로와 그 구동 방법 및 이를 이용한 유기발광표시장치 | |
CN107481675A (zh) | 像素驱动电路及其驱动方法、阵列基板及显示装置 | |
CN104123908A (zh) | 发光元件驱动电路及其相关的像素电路与应用 | |
CN105427805A (zh) | 像素驱动电路、方法、显示面板和显示装置 | |
CN107301845A (zh) | 像素驱动电路及其驱动方法 | |
CN107123397B (zh) | Amoled像素驱动电路及像素驱动方法 | |
CN105096826A (zh) | 一种像素电路及其驱动方法、阵列基板、显示装置 | |
CN108335671B (zh) | Amoled像素驱动电路及驱动方法 | |
CN106782322A (zh) | Amoled像素驱动电路及amoled像素驱动方法 | |
CN105139805A (zh) | 一种像素驱动电路及其驱动方法、显示装置 | |
CN107093405B (zh) | Amoled像素驱动电路及像素驱动方法 | |
WO2019047701A1 (zh) | 像素电路及其驱动方法、显示装置 | |
WO2017118036A1 (zh) | 像素驱动电路及其驱动方法、显示装置 | |
CN108987453B (zh) | 像素结构、驱动方法、像素电路和显示面板 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
GR01 | Patent grant | ||
GR01 | Patent grant |