CN101816035B - 无源矩阵oled显示器、驱动器及电流源/吸收器匹配方法 - Google Patents

无源矩阵oled显示器、驱动器及电流源/吸收器匹配方法 Download PDF

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CN101816035B
CN101816035B CN2008801101271A CN200880110127A CN101816035B CN 101816035 B CN101816035 B CN 101816035B CN 2008801101271 A CN2008801101271 A CN 2008801101271A CN 200880110127 A CN200880110127 A CN 200880110127A CN 101816035 B CN101816035 B CN 101816035B
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E·史密斯
S·沃尔斯特
B·托普松
R·佩奇
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Cambridge Display Technology Ltd
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    • GPHYSICS
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    • 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]
    • G09G3/3216Control 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 a passive matrix
    • 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]
    • G09G3/3266Details of drivers for scan electrodes
    • GPHYSICS
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    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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    • G09G2310/02Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0202Addressing of scan or signal lines
    • G09G2310/0205Simultaneous scanning of several lines in flat panels
    • G09G2310/0208Simultaneous scanning of several lines in flat panels using active addressing
    • GPHYSICS
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    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/029Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/04Maintaining the quality of display appearance
    • G09G2320/043Preventing or counteracting the effects of ageing
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02Details of power systems and of start or stop of display operation
    • G09G2330/025Reduction of instantaneous peaks of current
    • 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
    • G09G3/3283Details of drivers for data electrodes in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements

Abstract

一种匹配多个电流源和多个电流吸收器的电流匹配控制设备,多个电流吸收器具有由驱动处理器依照基准控制电流控制的驱动电流值并且其中多个电流吸收器的每个输出连接至公共输出节点;反馈电路,具有连接至公共输出节点的输入和连接至驱动处理器的输出,其中反馈电路通过传输信号至驱动处理器以调整基准控制电流来匹配公共输出节点的电压和基准电压。

Description

无源矩阵OLED显示器、驱动器及电流源/吸收器匹配方法
有机发光二极管(OLED)含有构成电光显示器的特殊优势。它们明亮、色彩丰富、切换迅速,提供较宽的视角并且易于在各种基板上制作且价格低廉。
根据所使用的材料,可以使用色彩范围内的聚合物或小分子来制作有机(其在本申请中包括有机金属)LED。WO 90/13148、WO95/06400和WO 99/48160中描述了基于聚合物的有机LED的示例;在US 4539507中描述了基于小分子的装置的示例,而在WO 99/21935和WO 02/067343中描述了基于树形化合物的材料的示例。
图1a显示了典型的有机LED的基本结构100。玻璃或塑料基板102支撑透明的阳极层104、电致发光(EL)层108和阴极110,所述阳极层包含例如其上沉积有空穴传输层106的氧化铟锡(ITO)。电致发光层108可以包含例如PEDOT:PSS(聚苯乙烯-磺酸-掺杂聚乙烯-二氧噻吩,polystyrene-sulphorate-doped polyethylene-dioxythiophene)。阴极层110通常包含诸如钙的低功函数金属,并且可以包括紧邻电致发光层108的附加层(如铝层)以改进的电子能级匹配。阳极和阴极的接触线114和116分别提供到电源118的连接。小分子装置也可以使用相同的基本结构。
在图1a所示的例子中,通过透明的阳极104和基板102以及被称为“底层发射器”的这类装置来发射光线120。例如,还可以通过保持阴极层110的厚度小于大约50-100mm而使阴极基本透明来构造射透阴极的装置。
有机LED可以按照像素矩阵的方式沉积在基板上以形成单色或多色像素化的显示器。可以使用红色、绿色和蓝色发射像素组来构造多色显示器。在这样的显示器中,通常通过激活行(或列)线以选择像素来寻址单个元件,并且写入像素行(或列)来形成显示。所谓的有源矩阵显示器具有与每个像素相关联的、通常为存储电容和晶体管的存储元件,而无源矩阵显示器不具有这样的存储元件且作为替代的是在一定程度上类似于电视图像进行重复扫描,以提供稳定图像的印象。
图1b显示了无源矩阵OLED显示器150的截面图,其中通过相同的附图标记表示与图1a中相同的元件。在无源矩阵显示器150中,电致发光层108包含多个像素152,而阴极层110包含多条相互电绝缘的导线154,导线154沿进入图1b的页面的方向排列,每一条具有相关联的触点156。同样,ITO阳极层104也包含与阴极线正交的多条阳极线158,在图1b中仅显示了其中的一条。为每条阳极线还提供有触点(图1b中未示出)。通过在相关阳极和阴极线之间施加电压,可以寻址位于阴极线和阳极线交叉点的电致发光像素152。
现在参考图2a,其概念性地显示了图1b所示类型的无源矩阵OLED显示器150的驱动配置。提供了多个恒流发生器200,每一个连接至电源线202和多条列线204中的一条,出于简明的目的而仅显示了其中的一条。还提供了多条行线206(仅显示了其中的一条)并且可以通过交换连接210将这些行线中的每一条选择性地连接至地线208。如图所示,线202具有正电源电压,列线204包含阳极连接158而行线206包含阴极连接154,如果电源线202相对于地线208为负时,所述连接可以反转。
如图所示,显示器的像素212具有施加在其上的电源并且因此而发亮。为了形成图像,在依次激活列线中的每一条的同时保持行的连接210,直到整行寻址结束,并且接着选择下一行并重复该处理。可替代地,可以选择一行并且并行地写入所有的列,也就是一行被选择并且同时驱动电流至列线中的每一条,以按照期望的亮度同时照亮一行中的每个像素。尽管后一配置需要更多的列驱动器电路,但因为其允许每个像素的更快刷新,所以其是优选的。在另一替代配置中,可以在寻址下一列之前依次寻址一列中的每个像素,尽管其尤其因为如下所述的列电容效应而通常并非是优选。可以理解,在图2a的配置中,列驱动器电路和行驱动器电路的功能可以互换。
因为OLED的亮度由流经它并且因而决定其输出的光子数目的电流来确定,所以通常将电流受控(而不是电压受控)的驱动提供至OLED。在电压受控的结构中,亮度可以沿显示器的区域并随时间、温度和年龄而变化,使得其难于预测当由给定电压驱动时像素将会出现怎样的亮度。在彩色显示器中,颜色显示的准确度也会受到影响。
图2b至2d分别显示了在对像素进行寻址的时间226内施加给像素的电流驱动220、像素两端的电压222以及像素的光输出224。对包含该像素的行进行寻址并且在虚线228所指示的时间,针对该像素将电流驱动至列线。列线(以及像素)具有相关联的电容并且因而电压逐渐升至最大230。直到达到像素两端的电压大于OLED二极管压降的点232时像素才开始发射光线。同样,当在时间234关闭驱动电流时,随着列电容的放电,电压和光输出逐渐衰减。当同时写入一行中的所有像素时,也就是当并行驱动列时,时间228和234之间的时间间隔对应于线扫描期间。图3显示了无源矩阵OLED显示器的通用驱动器电路的示意图300。OLED显示器由虚线302表示,并且包含分别具有相应的行电极触点306的多条(n条)行线304,以及具有相应的多个列电极触点310的多条(n条)列线308。在所示的配置中,OLED连接于每一对行和列线之间,其阳极连接至列线。y驱动器314以恒流驱动列线308而x驱动器316驱动行线304,选择性地将行线连接至接地。y驱动器314和x驱动器316通常由处理器318控制。电源(PSU)320为电路(尤其是y驱动器314)提供电源。
图4示意性地显示了诸如图3的显示器302的无源矩阵OLED显示器的一条列线的电流驱动器402的主要特征。通常在诸如图3的y驱动器314的列驱动集成电路中提供多个这样的电流驱动器,以驱动多个无源矩阵显示器列电极。
图4的电流驱动器402概述了该电路的主要特征并且包含并入有双极型晶体管416的电流驱动器块406,该双极型晶体管410具有基本上直接连接至电源电压为Vs的电源线404的发射极端子。(这不必然需要发射极端子通过完全直接的线路连接电源线或驱动器的端子,但优选的应当是在发射极和电源轨之间除驱动器电路中的通道(track)或连接的本征电阻之外没有中间部件)。列驱动输出408向OLED 412提供电流驱动,OLED 412通常具有经由行驱动器MOS开关(图4中未示出)的接地连接414。向电流驱动器块406提供电流控制输入410,并且尽管在实践中电流镜配置是优选的,但出于示例的目的,这里显示为电流控制输入410连接至晶体管416的基极。电流控制线410上的信号可以包含电压或电流信号。当电流驱动器块406提供可变的可控电流源时,每个电流驱动器块可以与数模转换器的模拟输出接口连接并受其控制。这样的可控电流源能够提供亮度或灰度可变显示器。改变像素亮度的其它方法包括使用脉冲宽度调制(PWM)按时改变像素。在PWM方案中,完全开启或者彻底关闭像素,而像素的表观亮度因为观看者眼睛内的时间累积而变化。
存在对能够提高OLED显示器寿命的技术的持续需求。因为制造无源矩阵显示器远比有源矩阵显示器便宜,所以存在对能够应用于无源矩阵显示器的技术的特定需求。减小OLED的驱动电平(并且因而亮度)能够大幅提高设备寿命-例如,将OLED的驱动/亮度减半能够增加它大约四倍的寿命。在其内容在此通过引用而并入的申请WO
2006035246、WO 2006035247和WO 2006035248中,申请人认识到多线寻址技术中的一个方案被用来减小尤其是无源矩阵OLED显示器中的显示器驱动电平峰值,并且因而增加显示器寿命。一般而言,这些方法包含在通过第一组列驱动信号驱动OLED显示器的多个列电极的同时通过第一组行驱动信号驱动显示器的两个或更多个行电极;接下来,在通过第二组列驱动信号驱动列电极的同时通过第二组行驱动信号驱动两个或更多个行电极。优选地,行和列驱动信号包含来自诸如电流源或电流吸收器的基本恒流发生器的电流驱动信号。优选地,这样的电流发生器是可控或可编程的,例如,使用数模转换器。
驱动一列的同时驱动两个或更多个行的效果是按照行驱动信号确定的比例在两个或更多个行之间划分列驱动-换言之,对于电流驱动而言,按照行驱动信号的相关值或比例所确定的比例在两个或更多个行之间划分一列中的电流。一般而言,这允许建立一行像素或一路像素在多线扫描期间的发光分布图,因而有效地减小OLED像素的峰值亮度,从而增加显示器像素的寿命。利用电流驱动,采用像素的连续驱动信号的基本线性和的方式获得期望的像素发光。
因此,本发明特别涉及提高无源矩阵OLED显示器的效率。有利的是,本发明还与多线寻址技术相兼容。
此前以它们最简单的形式来描述的电流发生电路包含电流源和电流吸收器。例如,如图3所示,可以认为列Y驱动器314是电流源而可以认为行X驱动器316是电流吸收器,然而本领域技术人员将会理解两者的功能能够反转。
电流Isink和电流源Isource是否匹配取决于多个因素,包括晶体管特性和诸如电压电平的运行参数。在操作中,失配驱动器是显示器图像拖尾的原因,例如,个别列比相邻列更难驱动。随着时间的推移,失配驱动器能够向着通常处于最大电压电平的匹配条件漂移。这样的匹配条件在如果不需要这样的最大电压电平时可能浪费电能,并且还能决定OLED显示器的寿命。
根据本发明的第一方面,提供了一种匹配多个电流源和多个电流吸收器的电流匹配控制设备,多个电流吸收器具有由驱动处理器依照基准控制电流来控制的驱动电流值并且其中多个电流吸收器的每个输出连接至公共输出节点;反馈电路,具有连接至公共输出节点的输入以及连接至驱动处理器的输出,其中反馈电路通过传输信号至驱动处理器以调整基准控制电流来匹配公共输出节点处的电压和基准电压。
优选地,多个电流吸收器的每一个经由第一电阻元件连接至公共输出节点。优选地,第二电阻元件连接在公共输出节点和基准电压源之间。更加优选地,反馈电路包含具有被连接以感测基准电压的第一输入以及被连接以感测公共输出节点处的电压的第二输入的比较器。比较器可以进一步包含连接至驱动处理器的输出端子。优选地,比较器被编程以输出信号来指示基准电压是否高于或低于所感测的公共输出节点处的电压。
在优选实施例中,在无源矩阵驱动显示器的行驱动器电路中包括本发明的设备。因此,行驱动器电路连接至多个电流吸收器而列驱动器电路连接至多个电流源。更加优选地,无源矩阵驱动显示器是发射型显示器并且甚至更加优选地,发射型显示器包含通过有机电致发光材料提供的各个发射像素的阵列。可以从小分子材料或聚合物有机材料中选择合适的有机电致发光材料。
根据本发明的第二方面,提供了一种无源矩阵驱动有机电致发光显示器中匹配多个电流源和吸收器的方法,包含:以第一电流值驱动一组多个第一电极;以第二电流值驱动一组多个第二电极;感测一组多个第二电极两端的电压;比较所感测的一组多个第二电极两端的电压和基准电压;以及调整第二电流值以使所感测的电压步近于(steptoward)基准电压。
优选地,感测多个第二电极两端的电压的步骤包括感测多个第二电极的平均电压。
优选地,调整第二电流值的步骤包括生成信号以指示所感测电压是否高于或低于基准电压。信号可以为单个比特。
在优选实施例中,第一电极包括列电极而第二电极包括显示器的行电极,并且驱动所述列和行电极包括分别以第一和第二组列驱动信号以及第一和第二组行驱动信号进行驱动。优选地,所述方法包括在以第一组列驱动信号驱动显示器的列电极的同时以第一组行驱动信号驱动显示器的两个或更多个行电极;接下来,在以第二组列驱动信号驱动列电极的同时以第二组行驱动信号驱动两个或更多个行电极。更加优选地,选择第一和第二列驱动信号以及所述的第一和第二行驱动信号,使得通过行和列电极驱动的显示器中期望的像素发光可以通过第一行和列驱动信号决定的发光与第二行和列驱动信号决定的发光的基本线性和来获得。
现在,将参考附图,以仅仅示例的方式描述本发明的这些和其它实施例。
图1a和1b分别显示了有机发光二极管和无源矩阵OLED显示器的截面图;
图2a和2d分别显示了无源矩阵OLED显示器的概念性的驱动器配置,显示器像素的电流驱动-时间的图,像素电压-时间的图,以及像素光输出-时间的图;
图3显示了根据现有技术的无源矩阵OLED显示器的通用驱动器电路的示意图;
图4显示了无源矩阵OLED显示器驱动器的框图;
图5是根据本发明实施例的无源矩阵驱动OLED显示器的示意图;以及
图6是根据本发明实施例的行驱动器的示意图。
在图5中,类似于参考图3所描述的一样,无源矩阵OLED显示器具有由行驱动器电路512驱动的行电极306和由列驱动器510驱动的列电极310。图6显示了根据本发明的行驱动器电路512的进一步细节。列驱动器510具有列数据输入509,用于设置一或更多列电极的电流驱动;类似地,行驱动器512具有行数据输入511,用于设置两个或更多个行的电流驱动比率。优选地,输入509和511是易于接口连接的数字输入;优选地,列数据输入509设置显示器302的全部m列的电流驱动。
在可能是串行或并行的数据和控制总线502上提供用于显示的数据。总线502提供输入至帧储存存储器503,帧储存存储器503存储显示器的每个像素的发光数据或者(在彩色显示器中)每个子像素的发光信息(该信息可以编码为单独的RGB彩色信号或发光和色度信号或者其它方式)。帧存储器503存储的数据确定显示器的每个像素(或者子像素)的期望表观亮度,可以由显示驱动处理器506通过第二、读取总线505读出该信息(在实施例中,可以省略总线505并且替代地使用总线502)。
可以全部以硬件或者使用所谓的数字信号处理核的软件,或者两者的结合,例如,使用加速矩阵运行的专用硬件来实现显示驱动处理器506。然而,显示驱动处理器506一般将会至少部分地由存储的程序代码或程序存储器507存储的微码在时钟508的控制下结合工作存储器504进行操作的方式来实现。可以在数据载体或可移除存储器507a上提供程序存储器507中的代码。
程序存储器507中的代码被配置为实现使用传统编程技术的一个或更多个的多线寻址方法。在一些实施例中,可以使用标准的数字信号处理器和按照任何传统编程语言运行的代码来实现这些方法。在这样的情况下,例如可以使用传统的DSP例程库来实现奇异值分解,或者出于该目的可以编写专用代码,或者可以实现不使用SVD的其它实施例,如上面结合驱动彩色显示器所描述的技术。
参考图6,根据本发明实施例的行驱动器600的示意图包含可连接至行数据输入511的多个行电极306的每一个。多个行电极306中的每一个又连接至高阻值电阻602,其中,提供多个高阻值电阻602来匹配多个行电极306。每个高阻值电阻602和相应的每个行电极306还连接至公共节点604,公共节点604通过基准电阻608连接至基准电压发生器606。
具有连接在基准电阻608和公共节点604之间的正输入端以及连接在基准电阻608和基准电压发生器606之间的负输入端的比较器610跨接基准电阻608。比较器610的输出端子连接至数字控制器612,数字控制器612包含校正逻辑模块614、校正查找表616、校正内插器618和后置处理模块620。
在操作中,在公共节点604提供所驱动的行电极306的平均行电压。如果所驱动的行电极306的平均行电压高于基准电压发生器606所生成的基准电压,则电流流入公共节点604并且流出至基准电压发生器606。如果所驱动的行电极306的平均行电压低于基准电压发生器606所生成的基准电压,则从基准电压发生器606流出的电流流向公共节点604。
通过比较器610检测电流,比较器610用来输出单比特以指示所驱动的行电极的平均行电压是否高于或低于基准电压。单比特被传输给数字控制器612并且用来调整后续帧的行基准电流。在接收到单比特信号时,数字控制器612通过校正逻辑模块614使用校正逻辑来调整行基准电流Iref。校正查找表616提供针对Iref调整的确定值,Iref接下来根据需求递增或递减。
毫无疑问,对于本领域技术人员而言,可以出现很多其它有效的替代方式。可以理解,本发明不限于所描述的实施例,并且包含在不脱离所附权利要求的实质和范围的情况下对于本领域技术人员而言显而易见的修改。

Claims (14)

1.一种无源矩阵有机发光二极管OLED显示器的显示驱动器,所述显示器包含有机发光二极管矩阵以及多个行电极和列电极;所述显示驱动器包括多个电流源和电流吸收器,所述行电极具有由驱动处理器依照基准控制电流控制的驱动电流值,并且其中所述多个行电极的每个输出连接至公共输出节点;反馈电路,具有连接至所述公共输出节点的输入以及连接至所述驱动处理器的输出,其中所述反馈电路被配置为通过将信号传输至驱动处理器以调整所述基准控制电流来匹配所述公共输出节点处的电压和基准电压。
2.如权利要求1所述的显示驱动器,其中所述多个电流吸收器的每一个经由第一电阻元件连接至所述公共输出节点。
3.如权利要求1或2所述的显示驱动器,其中第二电阻元件连接在所述公共输出节点和基准电压源之间。
4.如权利要求1所述的显示驱动器,其中所述反馈电路包含具有被连接以感测所述基准电压的第一输入以及被连接以感测所述公共输出节点处的电压的第二输入的比较器。
5.如权利要求4所述的显示驱动器,其中所述比较器包含连接至所述驱动处理器的输出端子。
6.如权利要求5所述的显示驱动器,其中所述比较器被编程以输出信号来指示所述基准电压是否高于或低于所感测的所述公共输出节点处的电压。
7.一种有机发光二极管OLED显示器,包括根据权利要求1-6中的任何一项所述的显示驱动器,其中行驱动器电路连接至所述多个电流吸收器,并且列驱动器电路连接至所述多个电流源。
8.一种在无源矩阵驱动有机电致发光显示器中匹配多个电流源和吸收器的方法,包含以下步骤:以第一电流值驱动一组多个第一电极;以第二电流值驱动一组多个第二电极;感测所述一组多个第二电极两端的电压;比较所感测的所述一组多个第二电极两端的电压和基准电压;以及调整所述第二电流值以使得所感测的电压步近于所述基准电压。
9.如权利要求8所述的方法,其中感测所述多个第二电极两端的电压的步骤包括:感测所述多个第二电极的平均电压。
10.如权利要求8或9所述的方法,其中调整所述第二电流值的步骤包括:生成信号以指示所感测的电压是否高于或低于所述基准电压。
11.如权利要求10中所述的方法,其中信号为单个比特。
12.如权利要求8所述的方法,其中所述第一电极包括列电极,所述第二电极包括所述显示器的行电极,并且驱动所述列电极和行电极包括分别以第一和第二组列驱动信号以及第一和第二组行驱动信号进行驱动。
13.如权利要求12中所述的方法,包括:在以第一组列驱动信号驱动所述显示器的列电极的同时以第一组行驱动信号驱动所述显示器的两个或更多个行电极;接下来,以第二组列驱动信号驱动列电极的同时以第二组行驱动信号驱动两个或更多个行电极。
14.如权利要求12或13所述的方法,其中选择所述第一和第二列驱动信号以及所述第一和第二行驱动信号,使得由所述行电极和列电极驱动的显示器中期望的像素发光通过由第一行和列驱动信号确定的发光和由第二行和列驱动信号确定的发光的基本线性和来获得。
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