CN105788531A - Oled显示面板的驱动电路 - Google Patents

Oled显示面板的驱动电路 Download PDF

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CN105788531A
CN105788531A CN201610345482.3A CN201610345482A CN105788531A CN 105788531 A CN105788531 A CN 105788531A CN 201610345482 A CN201610345482 A CN 201610345482A CN 105788531 A CN105788531 A CN 105788531A
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control signal
light emitting
display panel
emitting diode
organic light
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李�浩
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to CN201610345482.3A priority Critical patent/CN105788531A/zh
Priority to US15/119,382 priority patent/US10210802B2/en
Priority to PCT/CN2016/086428 priority patent/WO2017197701A1/zh
Publication of CN105788531A publication Critical patent/CN105788531A/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
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    • 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
    • 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]
    • G09G3/3275—Details of drivers for data electrodes

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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 El Displays (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

本发明提供一种OLED显示面板的驱动电路，设置有多个控制信号输出单元(10)、与呈阵列式排布的多个像素发光驱动单元(20)，所述多个控制信号输出单元(10)分别接收反映OLED显示面板不同显示区域内有机发光二级管老化信息的不同的反馈控制信号，每一控制信号输出单元(10)根据其接收到的反馈控制信号对应向像素发光驱动单元(20)输出一可调变发光控制信号，实现了根据OLED的老化程度来自适应调整相应像素发光驱动单元(20)在一帧画面周期内的发光时间，能够补偿由OLED老化导致的亮度降低，改善OLED显示面板的亮度不均问题。

Description

OLED显示面板的驱动电路
技术领域
本发明涉及OLED显示技术领域，尤其涉及一种OLED显示面板的驱动电路。
背景技术
有机发光二极管(OrganicLightEmittingDisplay，OLED)显示面板如OLED电视具有自发光、驱动电压低、响应时间短、清晰度与对比度高、近180°视角、使用温度范围宽，可实现柔性显示与大面积全色显示等诸多优点，被业界公认为是最有发展潜力的显示面板，越来越被市场所接受。
OLED是电流驱动器件，当有电流流过OLED时，OLED发光，但随着工作时间的增长，OLED会由于老化引起发光效率衰减，发光亮度下降，OLED显示面板则随之表现出亮度不均匀(Mura)的问题。
图1所示为一种现有的OLED驱动电路，包括：第一薄膜晶体管T1、第二薄膜晶体管T2、第三薄膜晶体管T3、电容Cs、及有机发光二极管D1，其中第一薄膜晶体管T1的栅极输入一发光控制信号EM10，用于控制有机发光二极管D1的发光时间，第二薄膜晶体管T2用于驱动有机发光二级管D1发光，设n、m均为正整数，第三薄膜晶体管T3的栅极输入OLED像素所在行对应的第n条扫描信号Scan(n)，源极输入OLED像素所在列对应的第m条数据信号Data(m)，用于对电容Cs进行预充电。
图2为图1所示驱动电路对应的时序图，一帧画面周期被划分为预充电时间与发光时间：在预充电时间，脉冲形式的扫描信号Scan(1)至Scan(n)逐条提供，发光控制信号EM10控制OLED显示面板内所有的第一薄膜晶体管T1截止使得有机发光二极管D1不发光，数据信号Data(1)至Data(m)分别输入对应的像素驱动电路，完成对整帧像素的预充电；在发光时间，发光控制信号EM10控制OLED显示面板内所有的第一薄膜晶体管T1导通，使得所有的有机发光二极管D1同时发光。图3示意出了上述现有的OLED驱动电路在图2所示的时序下其预充电时间与发光时间在一帧画面周期内的占空比，由图3可知，发光时间在一帧画面周期内的占空比较小，从而OLED显示面板的发光时间较短，帧画面亮度较低，如果需要提高亮度则要加大电流，此举会加速OLED的老化，而且该驱动电路对整个OLED显示面板只设置了一个时间固定的发光控制信号EM10，无法补偿由OLED老化导致的亮度降低，也无法改善OLED显示面板的亮度不均问题。
发明内容
本发明的目的在于提供一种OLED显示面板的驱动电路，能够补偿由OLED老化导致的亮度降低，改善OLED显示面板的亮度不均问题。
为实现上述目的，本发明提供一种OLED面板的驱动电路，包括：多个控制信号输出单元、呈阵列式排布的多个像素发光驱动单元、自上而下对应第n行像素发光驱动单元设置的沿水平方向延伸的第n条扫描线，及自左至右对应第m列像素发光驱动单元设置的沿竖直方向延伸的第m条数据线，n与m均为正整数；
所述像素发光驱动单元包括数个薄膜晶体管、有机发光二极管、及至少一个电容，用于驱动其内的有机发光二级管发光；
所述多个控制信号输出单元分别接收反映OLED显示面板不同显示区域内有机发光二级管老化信息的不同的反馈控制信号，每一控制信号输出单元根据其接收到的反馈控制信号对应向至少一个像素发光驱动单元输出一可调变发光控制信号，调整相应像素发光驱动单元在一帧画面周期内的发光时间；有机发光二级管老化越严重，相应可调变发光控制信号控制像素发光驱动单元在一帧画面周期内的发光时间越长。
对应一行像素发光驱动单元设置一个控制信号输出单元；第n个控制信号输出单元接收反映OLED显示面板第n行像素内有机发光二级管老化信息的第n条反馈控制信号，对应向第n行像素发光驱动单元输出第n条可调变发光控制信号，调整该第n行像素发光驱动单元在一帧画面周期内的发光时间。
所述像素发光驱动单元包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、电容、及有机发光二极管；对于第n行第m列像素发光驱动单元，第一薄膜晶体管的栅极接入所述第n条可调变发光控制信号，源级接入电源正电压，漏级电性连接于第二薄膜晶体管的源级；第二薄膜晶体管的栅极电性连接于节点，漏级电性连接于有机发光二极管的阳极；第三薄膜晶体管的栅极接入第n条扫描线传输的扫描信号，源级接入第m条数据线传输的数据信号，漏级电性连接于节点；电容的一端电性连接于节点，另一端电性连接于有机发光二极管的阳极；有机发光二极管的阴极接地。
所述第n条反馈控制信号与第n条可调变发光控制信号均为单脉冲信号，二者电位相反。
可选的，各个薄膜晶体管为N型薄膜晶体管，在第n行像素的预充电时间，第n条反馈控制信号为高电位，第n条可调变发光控制信号为低电位，在第n行像素发光驱动单元的发光时间，第n条反馈控制信号为低电位，第n条可调变发光控制信号高电位。
第n条反馈控制信号的高电位持续时间由第n行像素发光驱动单元内有机发光二级管的老化信息决定。
可选的，各个薄膜晶体管为P型薄膜晶体管，在第n行像素的预充电时间，第n条反馈控制信号为低电位，第n条可调变发光控制信号为高电位，在第n行像素的发光时间，第n条反馈控制信号为高电位，第n条可调变发光控制信号低电位。
第n条反馈控制信号的低电位持续时间由第n行像素发光驱动单元内有机发光二级管的老化信息决定。
本发明的有益效果：本发明提供的一种OLED显示面板的驱动电路，设置有多个控制信号输出单元、与呈阵列式排布的多个像素发光驱动单元，所述多个控制信号输出单元分别接收反映OLED显示面板不同显示区域内有机发光二级管老化信息的不同的反馈控制信号，每一控制信号输出单元根据其接收到的反馈控制信号对应向像素发光驱动单元输出一可调变发光控制信号，实现了根据OLED的老化程度来自适应调整相应像素发光驱动单元在一帧画面周期内的发光时间，能够补偿由OLED老化导致的亮度降低，改善OLED显示面板的亮度不均问题。
附图说明
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图中，
图1为一种现有的OLED驱动电路的电路图；
图2为图1所示的OLED驱动电路的时序图；
图3为图1所示的OLED驱动电路在图2所示的时序下其预充电时间与发光时间在一帧画面周期内的占空比的示意图；
图4为OLED发光效率随时间变化的曲线图；
图5为在保证亮度不降低的情况下OLED发光时间占空比与OLED发光效率之间的关系曲线图；
图6为本发明的OLED显示面板的驱动电路的架构示例图；
图7为本发明的OLED显示面板的驱动电路内像素驱动发光单元的电路示例图；
图8为针对图6所示OLED显示面板的驱动电路示例，相邻三个控制信号输出单元输入的反馈控制信号与输出的可调变发光控制信号的示意图；
图9为受图8所示的相邻三条可调变发光控制信号控制的相邻三行像素的发光时间的示意图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
本发明提供一种OLED显示面板的驱动电路。
设计构思该OLED显示面板的驱动电路的出发点是基于：如图4所示，OLED的发光效率会随着其工作时间的增长，老化程度的加剧而衰减，从而造成OLED发光亮度下降；那么如果要在OLED发光效率不同的情况下保证其亮度不降低，解决途径可以如图5所示，通过改变OLED发光时间的占空比使得OLED发光时间与OLED发光效率相适应，以保证亮度不降低，即若OLED发光效率越高、老化程度越轻，则OLED发光时间的占空比越小，相应OLED发光时间越短，而若OLED发光效率越低、老化程度越严重，则OLED发光时间的占空比越大，相应OLED发光时间越长。
请参阅图6，本发明的OLED显示面板的驱动电路包括多个控制信号输出单元10、呈阵列式排布的多个像素发光驱动单元20、自上而下对应第n行像素发光驱动单元20设置的沿水平方向延伸的第n条扫描线30，及自左至右对应第m列像素发光驱动单元20设置的沿竖直方向延伸的第m条数据线40，n与m均为正整数。
所述扫描线30用于传输扫描信号，数据线40用于传输数据信号。
所述像素发光驱动单元20包括数个薄膜晶体管、有机发光二极管D1、及至少一个电容，用于驱动其内的有机发光二级管D1发光。
所述多个控制信号输出单元10分别接收反映OLED显示面板不同显示区域内有机发光二级管老化信息的不同的反馈控制信号，每一控制信号输出单元10根据其接收到的反馈控制信号对应向至少一个像素发光驱动单元20输出一可调变发光控制信号，调整相应像素发光驱动单元20在一帧画面周期内的发光时间。有机发光二级管D1老化越严重，相应可调变发光控制信号控制像素发光驱动单元20在一帧画面周期内的发光时间越长，从而补偿由OLED老化导致的亮度降低，改善OLED显示面板的亮度不均问题。
为便于电路布局，如图6的示例，优选对应一行像素发光驱动单元20设置一个控制信号输出单元10，第n个控制信号输出单元10接收反映OLED显示面板第n行像素内有机发光二级管老化信息的第n条反馈控制信号SFB(n)，对应向第n行像素发光驱动单元20输出第n条可调变发光控制信号EM(n)，调整该第n行像素发光驱动单元20在一帧画面周期内的发光时间。当然，本发明并不局限于对应一行像素发光驱动单元20设置一个控制信号输出单元10，也可以对应一个或几个像素发光驱动单元20设置一个控制信号输出单元10，以便控制补偿更加精确。
具体地，所述像素发光驱动单元20可如图7的示例包括第一薄膜晶体管T1、第二薄膜晶体管T2、第三薄膜晶体管T3、电容Cs1、及有机发光二极管D1；对于第n行第m列像素发光驱动单元20，第一薄膜晶体管T1的栅极接入所述第n条可调变发光控制信号EM(n)，源级接入电源正电压VDD，漏级电性连接于第二薄膜晶体管T2的源级；第二薄膜晶体管T2的栅极电性连接于节点A，漏级电性连接于有机发光二极管D1的阳极；第三薄膜晶体管T3的栅极接入第n条扫描线30传输的扫描信号Scan(n)，源级接入第m条数据线40传输的数据信号Data(m)，漏级电性连接于节点A；电容Cs的一端电性连接于节点A，另一端电性连接于有机发光二极管D1的阳极；有机发光二极管D1的阴极接地。当然，所述像素发光驱动单元20的电路结构并不仅限于此，还可另外增加能够补偿阈值电压漂移的薄膜晶体管、电容等元件。
所述第一薄膜晶体管T1的栅极受第n条可调变发光控制信号EM(n)的控制有针对性的控制其所在像素发光驱动单元20的有机发光二极管D1的发光时间；第二薄膜晶体管T2用于驱动有机发光二级管D1发光；第三薄膜晶体管T3用于对电容Cs进行预充电。各个薄膜晶体管可如图7的示例均为N型薄膜晶体管，当然也可以均为P型薄膜晶体管，只需要根据N型薄膜晶体管、P型薄膜晶体管的不同驱动特性来相应改变各信号的电位高低即可。
进一步地，所述第n条反馈控制信号SFB(n)与第n条可调变发光控制信号EM(n)均为单脉冲信号，二者电位相反。
请同时参阅图8与图9，若各个薄膜晶体管为N型薄膜晶体管，在第n行像素的预充电时间，第n条反馈控制信号SFB(n)为高电位，且第n条反馈控制信号SFB(n)的高电位持续时间由第n行像素发光驱动单元20内有机发光二级管的老化信息决定，老化程度越严重，第n条反馈控制信号SFB(n)的高电位持续时间越短，相应第n条可调变发光控制信号EM(n)为低电位，控制第一薄膜晶体管T1的截止时间越短，有机发光二极管D1不发光；在第n行像素的发光时间，第n条反馈控制信号SFB(n)为低电位，第n条可调变发光控制信号EM(n)高电位，有机发光二极管D1发光，由于在一帧画面周期内，前期的预充电时间越短，占空比越小，则后期的发光时间越长，占空比越大，通过增加有机发光二极管D1的发光时间补偿了由老化导致的亮度降低，还能够改善OLED显示面板的亮度不均问题。
结合图7、图8、与图9，不同的控制信号输出单元10根据各自接收到的反映OLED显示面板不同行像素内有机发光二级管老化信息的反馈控制信号SFB(n-1)、SFB(n)、SFB(n+1)的不同而输出不同的可调变发光控制信号EM(n-1)、EM(n)、EM(n+1)，使得不同行像素的发光时间不同，实现了根据OLED的老化程度来自适应调整相应像素在一帧画面周期内的发光时间。
同理，若各个薄膜晶体管为P型薄膜晶体管，则在第n行像素的预充电时间，第n条反馈控制信号SFB(n)为低电位，且第n条反馈控制信号SFB(n)的低电位持续时间由第n行像素发光驱动单元20内有机发光二级管的老化信息决定，第n条可调变发光控制信号EM(n)为高电位；在第n行像素的发光时间，第n条反馈控制信号SFB(n)为高电位，第n条可调变发光控制信号EM(n)低电位。
综上所述，本发明的OLED显示面板的驱动电路，设置有多个控制信号输出单元、与呈阵列式排布的多个像素发光驱动单元，所述多个控制信号输出单元分别接收反映OLED显示面板不同显示区域内有机发光二级管老化信息的不同的反馈控制信号，每一控制信号输出单元根据其接收到的反馈控制信号对应向像素发光驱动单元输出一可调变发光控制信号，实现了根据OLED的老化程度来自适应调整相应像素发光驱动单元在一帧画面周期内的发光时间，能够补偿由OLED老化导致的亮度降低，改善OLED显示面板的亮度不均问题。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明后附的权利要求的保护范围。

Claims (8)

1.一种OLED显示面板的驱动电路，其特征在于，包括多个控制信号输出单元(10)、呈阵列式排布的多个像素发光驱动单元(20)、自上而下对应第n行像素发光驱动单元(20)设置的沿水平方向延伸的第n条扫描线(30)，及自左至右对应第m列像素发光驱动单元(20)设置的沿竖直方向延伸的第m条数据线(40)，n与m均为正整数；
所述像素发光驱动单元(20)包括数个薄膜晶体管、有机发光二极管(D1)、及至少一个电容，用于驱动其内的有机发光二级管(D1)发光；
所述多个控制信号输出单元(10)分别接收反映OLED显示面板不同显示区域内有机发光二级管老化信息的不同的反馈控制信号，每一控制信号输出单元(10)根据其接收到的反馈控制信号对应向至少一个像素发光驱动单元(20)输出一可调变发光控制信号，调整相应像素发光驱动单元(20)在一帧画面周期内的发光时间；有机发光二级管(D1)老化越严重，相应可调变发光控制信号控制像素发光驱动单元(20)在一帧画面周期内的发光时间越长。
2.如权利要求1所述的OLED显示面板的驱动电路，其特征在于，对应一行像素发光驱动单元(20)设置一个控制信号输出单元(10)；第n个控制信号输出单元(10)接收反映OLED显示面板第n行像素内有机发光二级管老化信息的第n条反馈控制信号(SFB(n))，对应向第n行像素发光驱动单元(20)输出第n条可调变发光控制信号(EM(n))，调整该第n行像素发光驱动单元(20)在一帧画面周期内的发光时间。
3.如权利要求2所述的OLED显示面板的驱动电路，其特征在于，所述像素发光驱动单元(20)包括第一薄膜晶体管(T1)、第二薄膜晶体管(T2)、第三薄膜晶体管(T3)、电容(Cs1)、及有机发光二极管(D1)；对于第n行第m列像素发光驱动单元(20)，第一薄膜晶体管(T1)的栅极接入所述第n条可调变发光控制信号(EM(n))，源级接入电源正电压(VDD)，漏级电性连接于第二薄膜晶体管(T2)的源级；第二薄膜晶体管(T2)的栅极电性连接于节点(A)，漏级电性连接于有机发光二极管(D1)的阳极；第三薄膜晶体管(T3)的栅极接入第n条扫描线(30)传输的扫描信号(Scan(n))，源级接入第m条数据线(40)传输的数据信号(Data(m))，漏级电性连接于节点(A)；电容(Cs)的一端电性连接于节点(A)，另一端电性连接于有机发光二极管(D1)的阳极；有机发光二极管(D1)的阴极接地。
4.如权利要求2所述的OLED显示面板的驱动电路，其特征在于，所述第n条反馈控制信号(SFB(n))与第n条可调变发光控制信号(EM(n))均为单脉冲信号，二者电位相反。
5.如权利要求4所述的OLED显示面板的驱动电路，其特征在于，各个薄膜晶体管为N型薄膜晶体管，在第n行像素的预充电时间，第n条反馈控制信号(SFB(n))为高电位，第n条可调变发光控制信号(EM(n))为低电位，在第n行像素的发光时间，第n条反馈控制信号(SFB(n))为低电位，第n条可调变发光控制信号(EM(n))高电位。
6.如权利要求5所述的OLED显示面板的驱动电路，其特征在于，第n条反馈控制信号(SFB(n))的高电位持续时间由第n行像素发光驱动单元(20)内有机发光二级管的老化信息决定。
7.如权利要求4所述的OLED显示面板的驱动电路，其特征在于，各个薄膜晶体管为P型薄膜晶体管，在第n行像素的预充电时间，第n条反馈控制信号(SFB(n))为低电位，第n条可调变发光控制信号(EM(n))为高电位，在第n行像素的发光时间，第n条反馈控制信号(SFB(n))为高电位，第n条可调变发光控制信号(EM(n))低电位。
8.如权利要求7所述的OLED显示面板的驱动电路，其特征在于，第n条反馈控制信号(SFB(n))的低电位持续时间由第n行像素发光驱动单元(20)内有机发光二级管的老化信息决定。
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