CN101816036A - 电流驱动式el显示器的电源电压的动态自适应 - Google Patents
电流驱动式el显示器的电源电压的动态自适应 Download PDFInfo
- Publication number
- CN101816036A CN101816036A CN200880110155A CN200880110155A CN101816036A CN 101816036 A CN101816036 A CN 101816036A CN 200880110155 A CN200880110155 A CN 200880110155A CN 200880110155 A CN200880110155 A CN 200880110155A CN 101816036 A CN101816036 A CN 101816036A
- Authority
- CN
- China
- Prior art keywords
- display
- voltage
- supply voltage
- display driver
- control circuit
- 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.)
- Pending
Links
- 230000006978 adaptation Effects 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000011159 matrix material Substances 0.000 claims description 29
- 230000005669 field effect Effects 0.000 claims description 4
- 230000004044 response Effects 0.000 claims description 4
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims 2
- 230000001276 controlling effect Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000005401 electroluminescence Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical compound C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- MRNHPUHPBOKKQT-UHFFFAOYSA-N indium;tin;hydrate Chemical compound O.[In].[Sn] MRNHPUHPBOKKQT-UHFFFAOYSA-N 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- WABPQHHGFIMREM-FTXFMUIASA-N lead-202 Chemical compound [202Pb] WABPQHHGFIMREM-FTXFMUIASA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- PLXMOAALOJOTIY-FPTXNFDTSA-N Aesculin Natural products OC[C@@H]1[C@@H](O)[C@H](O)[C@@H](O)[C@H](O)[C@H]1Oc2cc3C=CC(=O)Oc3cc2O PLXMOAALOJOTIY-FPTXNFDTSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229920000144 PEDOT:PSS Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000000412 dendrimer Substances 0.000 description 1
- 229920000736 dendritic polymer Polymers 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
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]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3283—Details 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
-
- 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]
-
- 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
- G09G2310/0202—Addressing of scan or signal lines
- G09G2310/0205—Simultaneous scanning of several lines in flat panels
- G09G2310/0208—Simultaneous scanning of several lines in flat panels using active addressing
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/028—Generation of voltages supplied to electrode drivers in a matrix display other than LCD
-
- 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
- G09G3/2007—Display of intermediate tones
- G09G3/2011—Display of intermediate tones by amplitude modulation
-
- 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
- G09G3/2007—Display of intermediate tones
- G09G3/2014—Display of intermediate tones by modulation of the duration of a single pulse during which the logic level remains constant
-
- 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]
- G09G3/3216—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 a passive matrix
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
本发明提供了一种显示驱动器控制电路以及控制电致发光显示器的显示驱动器的方法。显示驱动器包含驱动显示元件的至少一个基本恒流发生器(610),控制电路包含:驱动电压感测器(630),用于感测其中电流由恒流发生器来调整的第一线路(1、2…m)上的驱动电压(Vmax);基准电压发生器(645),用于向恒流发生器提供从电源线提供的电源电压(Vdd)偏移的基准电压(Vref);用于确定基准电压(Vref)和驱动电压(Vmax)之间的差异并且生成调整信号的装置(650),并且其中电压控制器(655)用来响应于调整信号来调整电源电压。
Description
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,列驱动电路和行驱动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。
参考图5,针对可控恒流源驱动的OLED,例示了对比从电源获得的电流与电源电压的图420。该曲线具有在正向电压足够开启OLED之前基本上没有电流的初始“死”区。紧跟非线性区域422的是曲线中高于虚线426所指示的电压的基本平坦的部分424,给出一个总体上“S”型的曲线。在虚线426所指示的电压,定义一个最小电源电压以保证恒流源针对受其控制而提供的电流来正常工作。
如能够从图5明显看到的一样,存在电源的增加仅增加了功耗的区域424。因而,优选地工作在虚线426所指示的电压或相接近的电压。然而,该界限的电源电压取决于多个因素,包括显示器年龄、显示器温度以及当通过恒流源提供电流时提供可变电流的源。因而,存在对如下技术的持续需求:能够让电源电压的控制适应改变的环境或驱动条件。
根据本发明的第一方面,提供了一种控制电致发光显示器的显示驱动器的显示驱动器控制电路,所述显示器包含驱动显示元件的至少一个基本恒流发生器,所述控制电路包含:驱动电压感测器,用于感测其中电流由恒流发生器来调整的第一线路上的驱动电压;基准电压生成器,用于向恒流发生器提供从电源线所提供的电源电压偏移的基准电压;用于确定基准电压与驱动电压之间的差异并且生成调整信号的确定装置,并且其中电压控制器被配置为响应于调整信号而调整电源电压。优选地,显示器为具有多个电致发光显示元件和多个基本恒流发生器的无源矩阵显示器,其中驱动电压感测器用来感测最大电压并且所述确定装置是被配置为确定基准电压和最大电压之间的差异的比较器。
更加优选地,驱动电源感测器包含多个晶体管,其中每一个晶体管具有连接至其中电流由恒流发生器来调整的线路的栅极,并且其中所述多个晶体管的每个源极端子共同连接至电源线,并且所述多个晶体管的每个漏极端子共同连接至另外的线路。
优选地,晶体管是n-沟道场效应晶体管并且另外的线路可选地处于接地电位或低于电源电压的电位。
优选地,基准电源发生器包含多个结电压并且电压控制器优选地包含直流至直流转换器。
同时,本发明的第一方面与通用的无源矩阵驱动方案相兼容,所述电路优选地被配置为用于多线寻址并且电致发光元件的发光能够通过到元件的连续驱动信号的基本线性和来获得。
根据本发明的第二方面,提供了一种对驱动电致发光显示器的显示驱动器的电源电压进行调整的方法,所述显示器包含至少一个电致发光显示元件,所述驱动器包括驱动显示元件的至少一个基本恒流发生器并且具有为恒流发生器提供电源电压的电源线,所述方法包含:感测从电源电压偏移的驱动电压;确定基准电压和驱动电压之间的差异并且生成调整信号;响应于调整信号而控制电源电压。
优选地,显示器为具有多个电致发光显示元件和多个基本恒流发生器的无源矩阵显示器,并且其中感测驱动电压包含感测最大电压并且所述确定包含确定基准电压和最大电压之间的差异。
同时,本发明的第二方面和通用的无源矩阵驱动方案相兼容,该方法优选地被配置为用于多线寻址,使得无源矩阵显示器包含行和列电极的阵列并且驱动显示器的方法包含在驱动多个列电极的同时驱动两个或更多行电极。更优选地,电致发光元件的期望发光可以通过到像素的连续驱动信号的基本线性和来获得。
优选地,控制步骤包括适时地增加电源电压或减小电源电压中的一个,并且增加电源电压比减小电源电压执行得更快速。
还存在对能够提高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WO2006035246、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行的效果是按照行驱动信号确定的比例在两个或更多行之间划分列驱动-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,采用到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。
现在,将参考附图,以仅示例的方式描述本发明的这些和其它实施例,在附图中:
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显示器的通用驱动电路的示意图;
图4显示了无源矩阵OLED显示器的列的电流驱动器;
图5显示了OLED显示器及其相关联的电流源的电流-电压曲线;以及
图6显示了根据本发明第一方面的无源矩阵OLED显示器驱动电路的示意图的一部分。
因此,图6显示了根据本发明第一实施例的无源矩阵OLED显示器600的示意图的一部分。显示器600包含由行驱动电路(图6中未示出)驱动的行电极和由列驱动器605驱动的列电极线1、2、3...m。每一列的驱动器包含如图4所述的基本恒流发生器610(通过电流源来例示)。在图6中,每个电流发生器610通过电源线615上的电源电压Vdd来供电并且由来自数模转换器(D/A)620的模拟输出来控制。向数模转换器620提供来自显示驱动逻辑的控制输入625以将显示数据提供至列驱动器610。显示驱动逻辑还可以将行选择控制提供至行驱动器(未示出)。可以为列电极线1、2、3...m中的每一个提供数模转换器610,或者可以采用例如时分复用的方式在列线之间共享单个数模转换器。
如图6所示,电流源为可控电流源以提供可变亮度或灰度显示,而在其它实施例中可以使用固定电流源。在这些实施例中可以使用脉冲宽度调制以给出对于人眼而言亮度可变的表观,或者可替代地,显示器的像素可以全部具有基本相同的相对亮度,也就是显示器可以不是灰阶显示器。在其它实施例中,显示器可以使用不同颜色的像素以提供色彩可变的显示器。
列电极线1、2、3...m中的每一条连接至n沟道场效应晶体管(FET)630的栅极端子G,n沟道FET 630的源极端子S共同连接至接地640(或者低于电源电压的一些其它电压)的下拉电阻635。n沟道FET 630的漏极端子D共同连接至电源线615。
基准电压源645包含内建结电压阵列,并且一端连接至电源线615而另一端连接至比较器650的第一输入端。比较器650具有连接至n沟道场效应晶体管630的每个源极端子的第二输入端。该比较器的输出端连接至电压控制器(PSU)655,用来改变提供至列驱动器605的输出电源电压。这样的电压控制器655可以包含本领域所公知的直流至直流控制器。
在操作中,电源电压Vdd初始具有例如15V的值并且基准电压源645提供3V的压降,从而保持比较器650第一输入的12V的基准电压Vref。每个FET 630的源极连接被作为最大列电压Vmax来提供,并且在任何列电极线1、2、3...m上升超过最大列电压时,将相应FET 630的栅极端子G上拉至源极端子S开启FET 630的电压之上,并且上拉源极端子电压S直到FET 630关闭或者相应FET 630的电流足够匹配经由下拉电阻635的电流吸收。通过比较器650比较最大列电压Vmax和基准电压Vref,比较器650生成指示是否需要增加或减小电源电压Vdd的单比特信号。当需要增加电源电压Vdd时,直流至直流控制器用来快速地增加电源电压。当需要减小电源电压Vdd时,直流至直流控制器用来让电源电压逐渐衰减。特别是,由于显示亮度和图像内容的增加,可能需要电源电压的快速增加。
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 (18)
1.一种控制电致发光显示器的显示驱动器的显示驱动器控制电路,所述显示器包含用于驱动所述显示元件的至少一个基本恒流发生器,所述控制电路包含:
驱动电压感测器,用于感测其中电流由所述恒流发生器来调整的第一线路上的驱动电压;
基准电压发生器,用于向所述恒流发生器提供从电源线所提供的电源电压偏移的基准电压;
用于确定基准电压和驱动电压之间的差异并且生成调整信号的确定装置,并且其中电压控制器被配置为响应于所述调整信号而调整所述电源电压。
2.如权利要求1所述的显示驱动器控制电路,其中所述显示器为具有多个电致发光显示元件和多个基本恒流发生器的无源矩阵显示器,其中所述驱动电压感测器被配置为感测最大电压,并且所述确定装置是被配置为确定所述基准电压和所述最大电压之间的差异的比较器。
3.如权利要求2所述的显示驱动器控制电路,其中所述驱动电压感测器包含多个晶体管,其中每一个晶体管具有连接至其中电流由所述恒流发生器来调整的线路的栅极,并且其中所述多个晶体管的每个源极端子共同连接至电源线,并且所述多个晶体管的每个漏极端子共同连接至另外的线路。
4.如权利要求3所述的显示驱动器控制电路,其中所述晶体管是n沟道场效应晶体管。
5.如权利要求3或4所述的显示驱动器控制电路,其中所述另外的线路处于接地电位或低于所述电源电压的电位。
6.如在前权利要求中的任一项所述的显示驱动器控制电路,其中所述基准电压发生器包含多个结电压。
7.如在前权利要求中的任一项所述的显示驱动器控制电路,其中所述电压控制器包含直流至直流转换器。
8.如在前权利要求中的任一项所述的显示驱动器控制电路,其中所述电致发光显示元件包含有机发光二极管。
9.如权利要求2所述的显示驱动器控制电路,其中无源矩阵显示器包含行和列的阵列并且所述电路被配置为用于多线寻址。
10.如权利要求9所述的显示驱动器控制电路,其中电致发光元件的发光能够通过到所述元件的连续驱动信号的基本线性和来获得。
11.一种对驱动电致发光显示器的显示驱动器的电源电压进行调整的方法,所述显示器包含至少一个电致发光显示元件,所述驱动器包括用于驱动所述显示元件的至少一个基本恒流发生器并且具有为所述恒流发生器提供电源电压的电源线,所述方法包含以下步骤:
感测从所述电源电压偏移的驱动电压;
确定所述基准电压和所述驱动电压之间的差异并且生成调整信号;
响应于所述调整信号而控制所述电源电压。
12.如权利要求11所述的方法,其中所述显示器为具有多个电致发光显示元件和多个基本恒流发生器的无源矩阵显示器,并且其中感测驱动电压的步骤包含感测最大电压,并且所述确定步骤包含确定所述基准电压和所述最大电压之间的差异。
13.如权利要求12所述的方法,其中所述无源矩阵显示器包含行和列电极的阵列并且所述驱动显示器的方法包含在驱动多个列电极的同时驱动两个或更多行电极的步骤。
14.如权利要求13所述的方法,其中期望的电致发光元件的发光能够通过像素的连续驱动信号的基本线性和来获得。
15.如权利要求11至14中任一项所述的方法,其中所述电致发光元件包含有机发光二极管。
16.如权利要求11至15中任一项所述的方法,其中控制步骤包括增加所述电源电压或减小所述电源电压中的一个,并且增加所述电源电压比减小所述电源电压执行得更快速。
17.一种基本如前面和/或参考附图中图6所述的显示驱动器。
18.一种对基本如前面和/或参考附图中图6所述的显示驱动器的电源电压进行调整的方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0719512A GB2453373A (en) | 2007-10-05 | 2007-10-05 | Voltage controlled display driver for an electroluminescent display |
GB0719512.6 | 2007-10-05 | ||
PCT/GB2008/003293 WO2009044114A1 (en) | 2007-10-05 | 2008-09-26 | Dynamic adaptation of the power supply voltage for current-driven el displays |
Publications (1)
Publication Number | Publication Date |
---|---|
CN101816036A true CN101816036A (zh) | 2010-08-25 |
Family
ID=38739212
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN200880110155A Pending CN101816036A (zh) | 2007-10-05 | 2008-09-26 | 电流驱动式el显示器的电源电压的动态自适应 |
Country Status (7)
Country | Link |
---|---|
US (1) | US20100259528A1 (zh) |
EP (1) | EP2206102A1 (zh) |
JP (1) | JP2010541012A (zh) |
KR (1) | KR20100087709A (zh) |
CN (1) | CN101816036A (zh) |
GB (1) | GB2453373A (zh) |
WO (1) | WO2009044114A1 (zh) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102203845A (zh) * | 2010-01-13 | 2011-09-28 | 松下电器产业株式会社 | 显示装置以及其驱动方法 |
CN109147667A (zh) * | 2018-09-21 | 2019-01-04 | 京东方科技集团股份有限公司 | 电压补偿装置及方法、阵列基板、显示装置 |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012172607A1 (ja) | 2011-06-16 | 2012-12-20 | パナソニック株式会社 | 表示装置 |
JP5753183B2 (ja) * | 2011-06-16 | 2015-07-22 | 株式会社Joled | 表示装置 |
KR101823701B1 (ko) | 2011-06-23 | 2018-01-30 | 가부시키가이샤 제이올레드 | 표시 장치 및 그 구동 방법 |
KR101836543B1 (ko) | 2011-07-12 | 2018-03-08 | 가부시키가이샤 제이올레드 | 표시 장치 |
CN102971782B (zh) | 2011-07-12 | 2016-03-09 | 株式会社日本有机雷特显示器 | 显示装置以及显示装置的驱动方法 |
CN104036721B (zh) * | 2014-05-15 | 2017-01-18 | 京东方科技集团股份有限公司 | 有机发光二极管显示面板及其驱动方法、显示装置 |
CN106374937A (zh) * | 2016-11-17 | 2017-02-01 | 广州派高智能科技有限公司 | 一种指示灯和按键复用端口控制的电路 |
CN107454710B (zh) * | 2017-05-31 | 2019-01-18 | 上海路傲电子科技有限公司 | 一种线性恒流驱动电路 |
Family Cites Families (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4539507A (en) * | 1983-03-25 | 1985-09-03 | Eastman Kodak Company | Organic electroluminescent devices having improved power conversion efficiencies |
US5594463A (en) * | 1993-07-19 | 1997-01-14 | Pioneer Electronic Corporation | Driving circuit for display apparatus, and method of driving display apparatus |
JP4108774B2 (ja) * | 1996-03-28 | 2008-06-25 | オリンパス株式会社 | ピーク検出回路 |
US6014030A (en) * | 1996-05-03 | 2000-01-11 | National Semiconductor Corp. | Current-level monitor with hierarchical precision |
US5923308A (en) * | 1996-11-12 | 1999-07-13 | Motorola, Inc. | Array of leds with active pull down shadow canceling circuitry |
EP0923067B1 (en) * | 1997-03-12 | 2004-08-04 | Seiko Epson Corporation | Pixel circuit, display device and electronic equipment having current-driven light-emitting device |
GB9812739D0 (en) * | 1998-06-12 | 1998-08-12 | Koninkl Philips Electronics Nv | Active matrix electroluminescent display devices |
JP2001215913A (ja) * | 2000-02-04 | 2001-08-10 | Toko Inc | 点灯回路 |
JP2002297098A (ja) * | 2001-03-30 | 2002-10-09 | Pioneer Electronic Corp | 発光パネルの駆動装置 |
JP4982014B2 (ja) * | 2001-06-21 | 2012-07-25 | 株式会社日立製作所 | 画像表示装置 |
JP3854173B2 (ja) * | 2002-02-27 | 2006-12-06 | 東北パイオニア株式会社 | 発光表示パネルの駆動方法および有機el表示装置 |
GB0209502D0 (en) * | 2002-04-25 | 2002-06-05 | Cambridge Display Tech Ltd | Display driver circuits |
GB2389951A (en) * | 2002-06-18 | 2003-12-24 | Cambridge Display Tech Ltd | Display driver circuits for active matrix OLED displays |
GB2389952A (en) * | 2002-06-18 | 2003-12-24 | Cambridge Display Tech Ltd | Driver circuits for electroluminescent displays with reduced power consumption |
JP2004045488A (ja) * | 2002-07-09 | 2004-02-12 | Casio Comput Co Ltd | 表示駆動装置及びその駆動制御方法 |
US7009603B2 (en) * | 2002-09-27 | 2006-03-07 | Tdk Semiconductor, Corp. | Method and apparatus for driving light emitting polymer displays |
ATE309595T1 (de) * | 2003-07-22 | 2005-11-15 | Barco Nv | Methode zur steuerung einer anzeige aus organischen leuchtdioden und anzeigevorrichtung, die zur ausführung dieser methode eingerichtet ist |
JP4836402B2 (ja) * | 2003-09-29 | 2011-12-14 | 東北パイオニア株式会社 | 自発光型表示装置 |
CN101069225A (zh) * | 2004-11-29 | 2007-11-07 | 罗姆股份有限公司 | 有机el驱动电路及使用其的有机el显示装置 |
FR2879008A1 (fr) * | 2004-12-06 | 2006-06-09 | St Microelectronics Sa | Adaptation automatique de la tension d'alimentation d'un ecran electroluminescent en fonction de la luminance souhaitee |
JP4657799B2 (ja) * | 2005-05-11 | 2011-03-23 | 株式会社リコー | 発光ダイオード駆動回路 |
GB2430069A (en) * | 2005-09-12 | 2007-03-14 | Cambridge Display Tech Ltd | Active matrix display drive control systems |
-
2007
- 2007-10-05 GB GB0719512A patent/GB2453373A/en not_active Withdrawn
-
2008
- 2008-09-26 EP EP08806443A patent/EP2206102A1/en not_active Withdrawn
- 2008-09-26 WO PCT/GB2008/003293 patent/WO2009044114A1/en active Application Filing
- 2008-09-26 CN CN200880110155A patent/CN101816036A/zh active Pending
- 2008-09-26 JP JP2010527514A patent/JP2010541012A/ja not_active Ceased
- 2008-09-26 KR KR1020107009948A patent/KR20100087709A/ko not_active Application Discontinuation
- 2008-09-26 US US12/680,122 patent/US20100259528A1/en not_active Abandoned
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102203845A (zh) * | 2010-01-13 | 2011-09-28 | 松下电器产业株式会社 | 显示装置以及其驱动方法 |
CN102203845B (zh) * | 2010-01-13 | 2015-11-25 | 株式会社日本有机雷特显示器 | 显示装置以及其驱动方法 |
CN109147667A (zh) * | 2018-09-21 | 2019-01-04 | 京东方科技集团股份有限公司 | 电压补偿装置及方法、阵列基板、显示装置 |
Also Published As
Publication number | Publication date |
---|---|
WO2009044114A1 (en) | 2009-04-09 |
JP2010541012A (ja) | 2010-12-24 |
EP2206102A1 (en) | 2010-07-14 |
GB2453373A (en) | 2009-04-08 |
US20100259528A1 (en) | 2010-10-14 |
KR20100087709A (ko) | 2010-08-05 |
GB0719512D0 (en) | 2007-11-14 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6441560B1 (en) | Active matrix electroluminescent display device | |
US7079092B2 (en) | Organic light-emitting diode (OLED) pre-charge circuit for use in a common anode large-screen display | |
CN101816036A (zh) | 电流驱动式el显示器的电源电压的动态自适应 | |
US8610650B2 (en) | Advanced multi line addressing | |
US7535441B2 (en) | Display driver circuits | |
US7956826B2 (en) | Electroluminescent display device to display low brightness uniformly | |
US8395565B2 (en) | Tagged multi line address driving | |
US7474283B2 (en) | Electroluminescent display devices | |
US20060001613A1 (en) | Display driver circuits for electroluminescent displays, using constant current generators | |
US20100295861A1 (en) | Extended multi line address driving | |
US7812793B2 (en) | Active matrix organic electroluminescent display device | |
US20060066525A1 (en) | Colour control for active matrix electroluminescent display | |
KR101038460B1 (ko) | 스파클링 효과를 가지는 디스플레이 디바이스와 그 구동방법 | |
KR20060133967A (ko) | 스크롤링 어드레스 지정을 하는 전계 발광 디스플레이디바이스 | |
US8847944B2 (en) | Matching current source/sink apparatus | |
EP1471493A1 (en) | Organic light-emitting diode (Oled) pre-charge circuit for use in a large-screen display |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100825 |