CN104464618A - Amoled驱动装置及驱动方法 - Google Patents
Amoled驱动装置及驱动方法 Download PDFInfo
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Abstract
本发明提供一种AMOLED驱动装置及驱动方法。该AMOLED驱动装置包括:一控制模块(1)、一电压模块(2)和一显示面板(3);所述控制模块(1)包括一时序控制单元(11)、一数据输出单元(12)、一黑画面输出单元(13)及一数据输出选择单元(14);所述电压模块(2)包括一Gamma等电压单元(21)及一OLED驱动电压单元(22)。所述时序控制单元(11)产生帧控制信号(Frame_ctr),用于控制数据输出选择单元(14)及OLED驱动电压单元(22),使得一个帧输出正常影像,另一帧输出黑画面,且在黑画面输出期间把预设正电位切换连接至电源负电位上,能够避免产生残影显示缺陷,并有效抑制第二晶体管阈值电压的偏移。
Description
技术领域
本发明涉及显示技术领域,尤其涉及一种AMOLED驱动装置及驱动方法。
背景技术
平面显示器件具有机身薄、省电、无辐射等众多优点,得到了广泛的应用。现有的平面显示器件主要包括液晶显示器件(Liquid Crystal Display,LCD)及有机发光二极管显示器件(Organic Light Emitting Display,OLED)。
有机发光二极管显示器件由于同时具备自发光,不需背光源、对比度高、厚度薄、视角广、反应速度快、可用于挠曲性面板、使用温度范围广、构造及制程较简单等优异特性,被认为是下一代平面显示器的新兴应用技术。
OLED按照驱动类型可分为无源OLED(PMOLED)和有源OLED(AMOLED)。AMOLED属于主动显示类型,在其显示面板上制作有呈阵列式分布的像素结构。
AMOLED的像素结构一般以两个晶体管搭配一个存储电容来存储电荷,以控制有机发光二极管的亮度表现;有机发光二极管是一种电流驱动元件,其根据流经的电流大小不同而产生不同程度的亮光。
图1所示为AMOLED像素结构的示意图,该像素结构包括驱动部分和发光部分,其中驱动部分包括:第一晶体管T1、第二晶体管T2、及存储电容CS,发光部分包括一有机发光二极管D。第一晶体管T1的漏极接收数据信号Data,栅极接收扫描信号Scan,源极电性连接于第二晶体管T2的栅极,扫描信号Scan控制该第一晶体管T1是否导通。第二晶体管T2漏极电性连接于电源正电位OVDD、源极电性连接于有机发光二极管D的正极。有机发光二极管D的负极电性连接于电源负电位OVSS;电容CS的一端电性连接于第二晶体管T2的栅极,另一端电性连接于第二晶体管T2的漏极。
采用现有的AMOLED驱动装置进行驱动时,相邻的两帧正常画面依次进行显示。当扫描信号Scan为低电平信号时,第一晶体管T1关断,使存储电容CS两端的电压无法通过第一晶体管T1放掉,理论上存储电容CS两端的电压维持不变,第二晶体管T2使有机发光二极管D继续维持发光,直到下一帧数据信号Data到来,如此循环,很容易造成当前帧显示的数据信号受上一帧数据信号的干扰,出现残影显示缺陷,且当显示同一个画面时间过久时,很容易造成第二晶体管T2的阈值电压出现偏移。
发明内容
本发明的目的在于提供一种AMOLED驱动装置,能够避免残影显示缺陷,解决当显示同一个画面时间过久时,容易造成第二晶体管的阈值电压出现偏移的问题。
本发明的目的还在于提供一种AMOLED驱动方法,能够避免残影显示缺陷,解决当显示同一个画面时间过久时,容易造成第二晶体管的阈值电压出现偏移的问题。
为实现上述目的,本发明首先提供一种AMOLED驱动装置,包括:一控制模块、一电压模块和一显示面板;所述控制模块包括一时序控制单元、一数据输出单元、一黑画面输出单元及一数据输出选择单元;所述电压模块包括一Gamma等电压单元及一OLED驱动电压单元;
所述显示面板具有多个呈阵列式排布的像素结构,每一像素结构包括一第一晶体管、一第二晶体管、一存储电容、及一有机发光二极管;
所述时序控制单元产生帧控制信号,用于控制数据输出选择单元;当帧控制信号为高电平时,所述数据输出选择单元向显示面板输出正常影像信号;当帧控制信号为低电平时,所述数据输出选择单元向显示面板输出黑画面;当一个帧输出正常影像信号时,则相邻的下一个帧输出黑画面;
所述时序控制单元产生的帧控制信号还用于控制OLED驱动电压单元,所述OLED驱动电压单元向有机发光二极管提供一电源正电位及一电源负电位;当所述帧控制信号为高电平,输出正常影像信号时,所述电源负电位与OLED驱动电压单元输出的预设负电位相连;当所述帧控制信号为低电平,输出黑画面时,电源负电位与OLED驱动电压单元输出的预设正电位相连;所述预设正电位高于电源正电位。
所述AMOLED驱动装置的输入频率为60HZ,输出频率提高到120HZ。
所述Gamma等电压单元提供扫描驱动电路和数据驱动电路所需的电压。
所述时序控制单元还产生扫描控制信号和数据控制信号。
所述时序控制单元接收来自于低压差分信号中的时钟信号和有效显示数据选通信号;所述数据输出单元接收来自于低压差分信号中的正常影像信号。
所述第一晶体管的漏极接收数据信号,栅极接收扫描信号,源极电性连接于第二晶体管的栅极;所述第二晶体管的漏极电性连接于电源正电位,源极电性连接于有机发光二极管的正极;有机发光二极管的负极电性连接于电源负电位;电容的一端电性连接于第二晶体管的栅极,另一端电性连接于第二晶体管的漏极。
相邻两帧的数据信号为正常影像信号与黑画面信号交替。
相邻两帧之间所述电源正电位与电源负电位的相位相反。
本发明还提供一种AMOLED驱动方法,其特征在于,包括:
步骤1、提供一控制模块、一电压模块及一显示面板;向所述控制模块输入一低压差分信号;
所述控制模块包括一时序控制单元、一数据输出单元、一黑画面输出单元和一数据输出选择单元;所述电压模块包括一Gamma等电压单元及一OLED驱动电压单元;
输入频率为60HZ;
步骤2、通过步骤1中输入的低压差分信号向时序控制单元发送时钟信号和有效显示数据选通信号,向数据输出单元发送正常影像信号;
步骤3、所述时序控制单元接收到时钟信号和有效显示数据选通信号后,向显示面板发送一扫描控制信号和一数据控制信号,并向数据输出选择单元及OLED驱动电压单元发送一帧控制信号;
步骤4、所述数据输出选择单元根据接收到的帧控制信号向显示面板交替输出正常影像信号、黑画面信号;输出频率提高到120HZ;
所述OLED驱动电压单元根据接收到的帧控制信号控制有机发光二极管的电源负电位交替切换连接至预设负电位、预设正电位;所述预设正电位高于电源正电位。
本发明的有益效果:本发明提供的AMOLED驱动装置及驱动方法,通过时序控制单元产生帧控制信号,利用该帧控制信号控制一个帧输出正常影像,另一帧输出黑画面,输出黑画面时可对上一帧存储电容进行放电,从而避免产生残影显示缺陷;同时,在黑画面输出期间,帧控制信号控制OLED驱动电压单元,把预设正电位切换连接至电源负电位上,使得第二晶体管的栅极与源极反向偏置,能够有效抑制第二晶体管阈值电压的偏移。
附图说明
下面结合附图,通过对本发明的具体实施方式详细描述,将使本发明的技术方案及其它有益效果显而易见。
附图中,
图1为AMOLED像素结构的示意图;
图2为本发明的AMOLED驱动装置的示意图;
图3为本发明的AMOLED驱动装置的信号波形图;
图4为本发明的AMOLED驱动装置的各帧显示画面的示意图;
图5为本发明的AMOLED驱动方法的流程图。
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。
请同时参阅图1、图2,本发明提供一种AMOLED驱动装置,包括:一控制模块1、一电压模块2和一显示面板3;所述控制模块1包括一时序控制单元11、一数据输出单元12、一黑画面输出单元13及一数据输出选择单元14;所述电压模块2包括一Gamma等电压单元21及一OLED驱动电压单元22。
所述显示面板3具有多个呈阵列式排布的像素结构,每一像素结构包括第一晶体管T1、第二晶体管T2、存储电容CS、及一有机发光二极管D。所述第一晶体管T1的漏极接收数据信号Data,栅极接收扫描信号Scan,源极电性连接于第二晶体管T2的栅极;所述第二晶体管T2的栅漏极电性连接于电源正电位OVDD,源极电性连接于有机发光二极管D的正极;有机发光二极管D的负极电性连接于电源负电位OVSS;电容CS的一端电性连接于第二晶体管T2的栅极,另一端电性连接于第二晶体管T2的漏极。
所述时序控制单元11产生帧控制信号Frame_ctr,用于控制数据输出选择单元14,数据输出选择单元14根据帧控制信号Frame_ctr向显示面板3输出正常影像信号DATA或者黑画面,当一个帧输出正常影像信号DATA时,则相邻的下一个帧输出黑画面。进一步的,请结合图4,当帧控制信号Frame_ctr为高电平时,所述数据输出选择单元14向显示面板3输出正常影像信号DATA;当帧控制信号Frame_ctr为低电平时,所述数据输出选择单元14向显示面板3输出黑画面。
所述时序控制单元11产生的帧控制信号Frame_ctr还用于控制OLED驱动电压单元22。具体的,所述OLED驱动电压单元22向有机发光二极管D提供一电源正电位OVDD及一电源负电位OVSS;当所述帧控制信号Frame_ctr为高电平,输出正常影像信号DATA时,所述电源负电位OVSS与OLED驱动电压单元22输出的预设负电位VSS相连;当所述帧控制信号Frame_ctr为低电平,输出黑画面时,电源负电位OVSS与OLED驱动电压单元22输出的预设正电位VDD相连。所述预设正电位VDD高于电源正电位OVDD。
进一步的,为实现一个帧输出正常影像信号DATA,与其相邻的下一个帧输出黑画面,即正常影像与黑画面交替输出,达到插黑效果。该AMOLED驱动装置的输入频率为60HZ,而输出频率提高到120HZ使得插黑帧不被人眼察觉;通过插入黑画面,在输出黑画面的时候对上一帧的存储电容CS进行放电,以解决当前帧显示的数据信号受上一帧数据信号的干扰的问题。
同时,在黑画面输出期间,帧控制信号Frame_ctr控制OLED驱动电压单元22,把预设正电位VDD切换连接至电源负电位OVSS上,使得第二晶体管T2的栅极与源极反向偏置,能够有效抑制第二晶体管T2阈值电压的偏移。
请参阅图3,相邻两帧之间所述电源正电位OVDD与电源负电位OVSS的相位相反,即输出正常影像信号DATA时,电源正电位OVDD高于电源负电位OVSS,而当输出黑画面时,电源正电位OVDD低于电源负电位OVSS,可以实现在输出黑画面期间,第二晶体管T2的栅极与源极反向偏置,抑制第二晶体管T2的阈值电压的偏移。
请参阅图4,相邻两帧之间的数据信号Data为正常影像信号DATA与黑画面信号交替,通过帧控制信号Frame_ctr的控制达到了在不改变原2T1C像素结构的基础上进行插黑的目的,解决了当前帧显示的数据信号受上一帧数据信号的干扰的问题,避免了残影显示缺陷的产生。
最后,所述Gamma等电压单元21提供扫描驱动电路和数据驱动电路所需的电压。所述时序控制单元11还产生扫描控制信号和数据控制信号。所述时序控制单元11接收来自于低压差分信号LVDS中的时钟信号CLK和有效显示数据选通信号DE。所述数据输出单元12接收来自于低压差分信号LVDS中的正常影像信号DATA。
请参阅图5,并结合图1至图4,本发明还提供一种AMOLED驱动方法,包括如下步骤:
步骤1、提供一控制模块1、一电压模块2及一显示面板3;向所述控制模块1输入一低压差分信号LVDS;
所述控制模块1包括一时序控制单元11、一数据输出单元12、一黑画面输出单元13和一数据输出选择单元14;所述电压模块2包括一Gamma等电压单元21及一OLED驱动电压单元22;
输入频率为60HZ;
步骤2、通过步骤1中输入的低压差分信号LVDS向时序控制单元11发送时钟信号CLK和有效显示数据选通信号DE,向数据输出单元12发送正常影像信号DATA;
步骤3、所述时序控制单元11接收到时钟信号CLK和有效显示数据选通信号DE后,向显示面板3发送一扫描控制信号和一数据控制信号,并向数据输出选择单元14及OLED驱动电压单元22发送一帧控制信号Frame_ctr;
步骤4、所述数据输出选择单元14根据接收到的帧控制信号Frame_ctr向显示面板3交替输出正常影像信号DATA、黑画面信号;输出频率提高到120HZ;
所述OLED驱动电压单元22根据接收到的帧控制信号Frame_ctr控制电源负电位OVSS交替切换连接至预设负电位VSS、预设正电位VDD;所述预设正电位VDD高于电源正电位OVDD。
该AMOLED驱动方法,由数据输出单元12、黑画面输出单元13分别向数据输出选择单元14输入正常影像信号DATA和黑画面信号,数据输出选择单元14根据接收到的不同的帧控制信号Frame_ctr向显示面板3交替输出正常影像信号DATA、黑画面信号,在不改变像素结构的基础上,通过提高输出频率来进行插黑;通过插入黑画面,在输出黑画面的时候对上一帧的存储电容CS进行放电,以解决当前帧显示的数据信号受上一帧数据信号的干扰的问题,避免了残影显示缺陷的产生。同时,在黑画面输出期间,帧控制信号Frame_ctr控制OLED驱动电压单元22,把预设正电位VDD切换连接至电源负电位OVSS上,使得第二晶体管T2的栅极与源极反向偏置,能够有效抑制第二晶体管T2阈值电压的偏移。
综上所述,本发明的AMOLED驱动装置及驱动方法,通过时序控制单元产生帧控制信号,利用该帧控制信号控制一个帧输出正常影像,另一帧输出黑画面,输出黑画面时可对上一帧存储电容进行放电,从而避免产生残影显示缺陷;同时,在黑画面输出期间,帧控制信号控制OLED驱动电压单元,把预设正电位切换连接至电源负电位上,使得第二晶体管的栅极与源极反向偏置,能够有效抑制第二晶体管阈值电压的偏移。
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权利要求的保护范围。
Claims (9)
1.一种AMOLED驱动装置,其特征在于,包括:一控制模块(1)、一电压模块(2)和一显示面板(3);所述控制模块(1)包括一时序控制单元(11)、一数据输出单元(12)、一黑画面输出单元(13)及一数据输出选择单元(14);所述电压模块(2)包括一Gamma等电压单元(21)及一OLED驱动电压单元(22);
所述显示面板(3)具有多个呈阵列式排布的像素结构,每一像素结构包括一第一晶体管(T1)、一第二晶体管(T2)、一存储电容(CS)、及一有机发光二极管(D);
所述时序控制单元(11)产生帧控制信号(Frame_ctr),用于控制数据输出选择单元(14);当帧控制信号(Frame_ctr)为高电平时,所述数据输出选择单元(14)向显示面板(3)输出正常影像信号(DATA);当帧控制信号(Frame_ctr)为低电平时,所述数据输出选择单元(14)向显示面板(3)输出黑画面;当一个帧输出正常影像信号(DATA)时,则相邻的下一个帧输出黑画面;
所述时序控制单元(11)产生的帧控制信号(Frame_ctr)还用于控制OLED驱动电压单元(22),所述OLED驱动电压单元(22)向有机发光二极管(D)提供一电源正电位(OVDD)及一电源负电位(OVSS);当所述帧控制信号(Frame_ctr)为高电平,输出正常影像信号(DATA)时,所述电源负电位(OVSS)与OLED驱动电压单元(22)输出的预设负电位(VSS)相连;当所述帧控制信号(Frame_ctr)为低电平,输出黑画面时,电源负电位(OVSS)与OLED驱动电压单元(22)输出的预设正电位(VDD)相连;所述预设正电位(VDD)高于电源正电位(OVDD)。
2.如权利要求1所述的AMOLED驱动装置,其特征在于,所述AMOLED驱动装置的输入频率为60HZ,输出频率提高到120HZ。
3.如权利要求1所述的AMOLED驱动装置,其特征在于,所述Gamma等电压单元(21)提供扫描驱动电路和数据驱动电路所需的电压。
4.如权利要求1所述的AMOLED驱动装置,其特征在于,所述时序控制单元(11)还产生扫描控制信号和数据控制信号。
5.如权利要求1所述的AMOLED驱动装置,其特征在于,所述时序控制单元(11)接收来自于低压差分信号(LVDS)中的时钟信号(CLK)和有效显示数据选通信号(DE);所述数据输出单元(12)接收来自于低压差分信号(LVDS)中的正常影像信号(DATA)。
6.如权利要求1所述的AMOLED驱动装置,其特征在于,所述第一晶体管(T1)的漏极接收数据信号(Data),栅极接收扫描信号(Scan),源极电性连接于第二晶体管(T2)的栅极;所述第二晶体管(T2)的漏极电性连接于电源正电位(OVDD),源极电性连接于有机发光二极管(D)的正极;有机发光二极管(D)的负极电性连接于电源负电位(OVSS);电容(CS)的一端电性连接于第二晶体管(T2)的栅极,另一端电性连接于第二晶体管(T2)的漏极。
7.如权利要求1所述的AMOLED驱动装置,其特征在于,相邻两帧的数据信号(Data)为正常影像信号(DATA)与黑画面信号交替。
8.如权利要求1所述的AMOLED驱动装置,其特征在于,相邻两帧之间所述电源正电位(OVDD)与电源负电位(OVSS)的相位相反。
9.一种AMOLED驱动方法,其特征在于,包括:
步骤1、提供一控制模块(1)、一电压模块(2)及一显示面板(3);向所述控制模块(1)输入一低压差分信号(LVDS);
所述控制模块(1)包括一时序控制单元(11)、一数据输出单元(12)、一黑画面输出单元(13)和一数据输出选择单元(14);所述电压模块(2)包括一Gamma等电压单元(21)及一OLED驱动电压单元(22);
输入频率为60HZ;
步骤2、通过步骤1中输入的低压差分信号(LVDS)向时序控制单元(11)发送时钟信号(CLK)和有效显示数据选通信号(DE),向数据输出单元(12)发送正常影像信号(DATA);
步骤3、所述时序控制单元(11)接收到时钟信号(CLK)和有效显示数据选通信号(DE)后,向显示面板(3)发送一扫描控制信号和一数据控制信号,并向数据输出选择单元(14)及OLED驱动电压单元(22)发送一帧控制信号(Frame_ctr);
步骤4、所述数据输出选择单元(14)根据接收到的帧控制信号(Frame_ctr)向显示面板(3)交替输出正常影像信号(DATA)、黑画面信号;输出频率提高到120HZ;
所述OLED驱动电压单元(22)根据接收到的帧控制信号(Frame_ctr)控制电源负电位(OVSS)交替切换连接至预设负电位(VSS)、预设正电位(VDD);所述预设正电位(VDD)高于电源正电位(OVDD)。
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- 2015-02-06 US US14/428,634 patent/US9613566B2/en active Active
- 2015-02-06 WO PCT/CN2015/072351 patent/WO2016070506A1/zh active Application Filing
- 2015-02-06 JP JP2017522832A patent/JP6570629B2/ja active Active
- 2015-02-06 KR KR1020177007171A patent/KR20170042721A/ko not_active Application Discontinuation
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US10319292B2 (en) | 2015-09-15 | 2019-06-11 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Driving system for a display device, and driving circuit applicable to OLED |
WO2017045235A1 (zh) * | 2015-09-15 | 2017-03-23 | 深圳市华星光电技术有限公司 | 一种显示装置的驱动系统及适用于oled的驱动电路 |
CN105047138A (zh) * | 2015-09-15 | 2015-11-11 | 深圳市华星光电技术有限公司 | 一种显示装置的驱动系统及适用于oled的驱动电路 |
WO2017067020A1 (zh) * | 2015-10-23 | 2017-04-27 | 深圳市华星光电技术有限公司 | 一种显示装置及其驱动方法 |
WO2018036098A1 (zh) * | 2016-08-25 | 2018-03-01 | 深圳市华星光电技术有限公司 | 一种用于驱动amoled像素的电路及方法 |
US10223976B2 (en) | 2016-08-25 | 2019-03-05 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Circuit and method for driving AMOLED pixel to reduce residual images |
CN107301840A (zh) * | 2017-08-11 | 2017-10-27 | 京东方科技集团股份有限公司 | 一种像素补偿电路及方法、显示驱动装置和显示装置 |
CN112992074A (zh) * | 2019-12-16 | 2021-06-18 | 乐金显示有限公司 | 显示装置及其驱动方法 |
CN112992074B (zh) * | 2019-12-16 | 2024-02-09 | 乐金显示有限公司 | 显示装置及其驱动方法 |
CN111883055A (zh) * | 2020-07-30 | 2020-11-03 | 维信诺科技股份有限公司 | 像素电路及其驱动方法 |
CN113012652A (zh) * | 2021-03-09 | 2021-06-22 | Tcl华星光电技术有限公司 | 一种背光驱动电路及液晶显示装置 |
US11967288B2 (en) | 2021-03-09 | 2024-04-23 | Tcl China Star Optoelectronics Technology Co., Ltd. | Backlight driving circuit and liquid crystal display device |
CN113112961A (zh) * | 2021-04-12 | 2021-07-13 | 深圳市华星光电半导体显示技术有限公司 | 显示驱动电路及显示驱动电路的驱动方法 |
Also Published As
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GB2545131B (en) | 2021-04-07 |
GB2545131A (en) | 2017-06-07 |
US9613566B2 (en) | 2017-04-04 |
JP2017535813A (ja) | 2017-11-30 |
KR20170042721A (ko) | 2017-04-19 |
US20160343296A1 (en) | 2016-11-24 |
CN104464618B (zh) | 2017-02-15 |
GB201703932D0 (en) | 2017-04-26 |
JP6570629B2 (ja) | 2019-09-04 |
WO2016070506A1 (zh) | 2016-05-12 |
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