CN105913805A - 一种amoled显示的像素驱动电路结构 - Google Patents

一种amoled显示的像素驱动电路结构 Download PDF

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CN105913805A
CN105913805A CN201610394540.1A CN201610394540A CN105913805A CN 105913805 A CN105913805 A CN 105913805A CN 201610394540 A CN201610394540 A CN 201610394540A CN 105913805 A CN105913805 A CN 105913805A
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driving
pipe
pixel
tft3
electric capacity
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胡双
史永胜
宁青菊
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Shaanxi University of Science and Technology
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Shaanxi University of Science and Technology
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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
    • G09G3/3258—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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

本发明公开了一种AMOLED显示的像素驱动电路结构，由N行N列像素单元连接组成，每一行中的像素单位采用3个TFT，且每一行的所有像素单元共同拥有一个电容，每个像素单元增加一个驱动电压信号线。本发明不仅可以应用于恒定电流结构，而且可以用于源极跟随结构，以及不仅可以采用单晶硅TFT，而且可以采用多晶硅TFT。本发明相比传统的像素驱动电路，电容的数量得以减少，减少了器件使用量，降低了成本，电路更加简单。

Description

一种AMOLED显示的像素驱动电路结构
【技术领域】
本发明属于AMOLED显示领域，具体涉及一种AMOLED显示的像素驱动电路结构。
【背景技术】
有源矩阵有机发光显示面板(Active Matrix/Organic Light Emitting Diode,AMOLED)作为第三代显示技术有着高亮度、宽视角、响应速度快等优势。其中，该技术的像素电路包括恒定电流结构和源极跟随结构两种，传统的这两种像素单元由2T1C，即两个薄膜晶体管(Thin Film Transistor)和一个电容(Capacitor)组成，整个显示屏由N行N列该像素单元以及驱动像素单元电路的行扫描信号线、列Vdd信号线和数据电压信号线组成。随着该显示技术的发展，显示屏则向着更薄、更轻、响应速度更快的方向发展，人们逐渐研究并改进着像素单元电路结构。
【发明内容】
本发明的目的在于改进传统的两种像素单元驱动电路，提供一种AMOLED显示的像素驱动电路结构。
为了实现上述目的，本发明所采用的方案是：
一种AMOLED显示的像素驱动电路结构，包括若干结构相同的像素单元驱动电路，每个像素单元驱动电路均包括开关管TFT1、驱动管TFT2以及驱动管TFT3；开关管TFT1的栅极接扫描信号电压Vscan，源极接数据信号电压Vdata，漏极分别接驱动管TFT2的栅极和驱动管TFT3的源极；驱动管TFT2的源极接OLED的阴极，漏极接地；驱动管TFT3的栅极接驱动电压信号VMN，VMN为第M行第N列的像素单元中驱动电容C充放电的驱动信号电压；同一行像素单元驱动电路的驱动管TFT3的漏极均连接至电容C的同一侧，电容C的另一侧接地。
本发明还提出一种AMOLED显示的像素驱动电路结构，其特征在于，包括若干结构相同的像素单元驱动电路，每个像素单元驱动电路均包括开关管TFT1、驱动管TFT2以及驱动管TFT3；开关管TFT1的栅极接扫描信号电压Vscan，源极接数据信号电压Vdata，漏极分别接驱动管TFT2的栅极和驱动管TFT3的源极；驱动管TFT2的漏极接OLED的阳极，源极接电源电压Vdd，OLED的阴极接地；驱动管TFT3的栅极接驱动电压信号VMN，VMN为第M行第N列的像素单元中驱动电容C充放电的驱动信号电压；同一行像素单元驱动电路的驱动管TFT3的漏极均连接至电容C的同一侧，电容C的另一侧接电源电压Vdd。
与现有技术相比，本发明具有以下有益效果：
本发明由N行N列像素单元连接组成，每一行中的像素单位采用3个TFT，且每一行的所有像素单元共同拥有一个电容，每个像素单元增加一个驱动电压信号线。本发明不仅可以应用于恒定电流结构，而且可以用于源极跟随结构，以及不仅可以采用单晶硅TFT，而且可以采用多晶硅TFT。本发明相比传统的像素驱动电路，电容的数量得以减少，减少了器件使用量，降低了成本，电路更加简单。
【附图说明】
图1为本发明的像素驱动恒定电流结构；
图2为本发明的像素驱动源极跟随结构；
其中，如图1和图2所示，TFT1为开关管，TFT2、TFT3均为驱动管，C为电容，OLED为有机发光二极管，Vscan为扫描信号电压，Vdata为数据信号电压，Vdd为提供像素电路的电源电压，V11为第一行第一列的像素单元中驱动C充放电的信号电压，V12为第一行第二列的像素单元中驱动C放电的信号电压。
【具体实施方式】
下面结合附图对本发明做进一步详细描述：
参见图1，本发明AMOLED显示的像素驱动电路结构，由N行N列的改进型像素单元驱动电路构成，包括恒定电流结构或源极跟随结构；其中，每一行中的像素单元采用3个TFT，且每一行的所有像素单元共同拥有一个电容；每一个像素单元增加一个驱动电压信号线，该驱动电压信号线的目的在于驱动电容充电和放电；像素单元中的TFT包括单晶硅TFT和多晶硅TFT两种。
实施例1
恒定电流结构：包括若干结构相同的像素单元驱动电路，每个像素单元驱动电路均包括开关管TFT1、驱动管TFT2以及驱动管TFT3；开关管TFT1的栅极接扫描信号电压Vscan，源极接数据信号电压Vdata，漏极分别接驱动管TFT2的栅极和驱动管TFT3的源极，开关管TFT1控制数据信号电压Vdata的写入；驱动管TFT2的源极接OLED的阴极，漏极接地，驱动管TFT2驱动OLED发光；驱动管TFT3的栅极接驱动电压信号VMN，VMN为第M行第N列的像素单元中驱动电容C充放电的驱动信号电压，驱动管TFT3控制电容C的充放电；同一行像素单元驱动电路的驱动管TFT3的漏极均连接至电容C的同一侧，电容C的另一侧接地。
实施例2
源极跟随结构：包括若干结构相同的像素单元驱动电路，每个像素单元驱动电路均包括开关管TFT1、驱动管TFT2以及驱动管TFT3；开关管TFT1的栅极接扫描信号电压Vscan，源极接数据信号电压Vdata，漏极分别接驱动管TFT2的栅极和驱动管TFT3的源极，开关管TFT1控制数据信号电压Vdata的写入；驱动管TFT2的漏极接OLED的阳极，源极接电源电压Vdd，OLED的阴极接地，驱动管TFT2驱动OLED发光；驱动管TFT3的栅极接驱动电压信号VMN，VMN为第M行第N列的像素单元中驱动电容C充放电的驱动信号电压，驱动管TFT3控制电容C的充放电；同一行像素单元驱动电路的驱动管TFT3的漏极均连接至电容C的同一侧，电容C的另一侧接电源电压Vdd。
本发明的原理：
如图1和2所示，本发明中像素单元电路包括开关管TFT1、驱动管TFT2、驱动管TFT3、电容C、OLED、数据信号电压Vdata、提供像素电路的电源电压Vdd、扫描线信号电压Vscan以及驱动电容C充放电的V11和驱动电容C放电的V12，依次类推，第一行其他列也具有驱动其所在位置的像素单元C放电的信号电压V1N。
当处于预充电阶段，给扫描线信号电压Vscan、数据信号电压Vdata和V11信号电压，开关管TFT1和驱动管TFT3处于打开状态，电容C充电至电源电压Vdd。
当像素单元处于持续发光阶段时，给V11、V12……V1N和Vdd信号电压，驱动管TFT2和驱动管TFT3打开，电容C放电，当一行中第N列的像素单元需要OLED发光时，此时给像素单元中所在的V1N信号电压，从而电容给所在位置的像素单元放电，使得该像素单元的OLED发光。
以上内容仅为说明本发明的技术思想，不能以此限定本发明的保护范围，凡是按照本发明提出的技术思想，在技术方案基础上所做的任何改动，均落入本发明权利要求书的保护范围之内。

Claims (2)

1.一种AMOLED显示的像素驱动电路结构，其特征在于，包括若干结构相同的像素单元驱动电路，每个像素单元驱动电路均包括开关管TFT1、驱动管TFT2以及驱动管TFT3；开关管TFT1的栅极接扫描信号电压Vscan，源极接数据信号电压Vdata，漏极分别接驱动管TFT2的栅极和驱动管TFT3的源极；驱动管TFT2的源极接OLED的阴极，漏极接地；驱动管TFT3的栅极接驱动电压信号VMN，VMN为第M行第N列的像素单元中驱动电容C充放电的驱动信号电压；同一行像素单元驱动电路的驱动管TFT3的漏极均连接至电容C的同一侧，电容C的另一侧接地。
2.一种AMOLED显示的像素驱动电路结构，其特征在于，包括若干结构相同的像素单元驱动电路，每个像素单元驱动电路均包括开关管TFT1、驱动管TFT2以及驱动管TFT3；开关管TFT1的栅极接扫描信号电压Vscan，源极接数据信号电压Vdata，漏极分别接驱动管TFT2的栅极和驱动管TFT3的源极；驱动管TFT2的漏极接OLED的阳极，源极接电源电压Vdd，OLED的阴极接地；驱动管TFT3的栅极接驱动电压信号VMN，VMN为第M行第N列的像素单元中驱动电容C充放电的驱动信号电压；同一行像素单元驱动电路的驱动管TFT3的漏极均连接至电容C的同一侧，电容C的另一侧接电源电压Vdd。
CN201610394540.1A 2016-06-06 2016-06-06 一种amoled显示的像素驱动电路结构 Pending CN105913805A (zh)

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