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CN101499485A - 有机发光显示器及其驱动方法 - Google Patents

有机发光显示器及其驱动方法 Download PDF

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CN101499485A
CN101499485A CNA2009100059682A CN200910005968A CN101499485A CN 101499485 A CN101499485 A CN 101499485A CN A2009100059682 A CNA2009100059682 A CN A2009100059682A CN 200910005968 A CN200910005968 A CN 200910005968A CN 101499485 A CN101499485 A CN 101499485A
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power
voltage
light emitting
organic light
signal
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李德珍
李正鲁
郭鲁敏
郑又硕
俞智娜
金敏载
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Samsung Display Co Ltd
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Samsung Mobile Display Co Ltd
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    • 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
    • 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]
    • G09G3/3216Control 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
    • 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]
    • 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]
    • G09G3/3225Control 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
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00Electroluminescent light sources
    • H05B33/12Light sources with substantially two-dimensional radiating surfaces
    • 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
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0271Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • 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
    • G09G2330/021Power management, e.g. power saving
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00Aspects of the architecture of display systems
    • G09G2360/16Calculation or use of calculated indices related to luminance levels in display data

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

Abstract

本发明提供了一种有机发光显示器及其驱动方法。所述有机发光显示器包括:显示单元,响应于从第一电源经过显示单元流到第二电源的电流而发射光。所述电流与数据信号和扫描信号对应。根据一个实施例,所述有机发光显示器还包括:电源单元,具有用于将第一电源的第一功率输出到显示单元的第一输出端和用于将第二电源的第二功率输出到显示单元的第二输出端;驱动电压计算单元,确定与所述电流对应的第二功率的电压,从而可以降低所述有机发光显示器的功耗。

Description

有机发光显示器及其驱动方法
技术领域
本发明涉及一种有机发光显示器及其驱动方法。
背景技术
近来,已经开发出了与阴极射线管(CRT)相比重量和体积均减小的各种平板显示(FPD)装置。FPD装置包括液晶显示器、场发射显示器、等离子体显示面板和有机发光显示器等。
有机发光显示器使用通过电子和空穴的复合产生光的有机发光二极管(OLED)来显示图像。
如上所述的有机发光显示器具有各种优点,例如优异的色彩表示、减小的厚度等,因此,除了蜂窝电话应用之外,有机发光显示器的市场很大程度上已经扩展到其它应用,例如个人数字助理(PDA)和MP3播放器等。
在有机发光显示器中使用的OLED包括阳极、阴极和形成在阳极与阴极之间的发光层。当电流从阳极流向阴极时,OLED从发光层发射光。发射的光的量根据在OLED中流动的电流的量而发生改变,从而显示各种亮度水平。
图1是示出了饱和点按照在OLED中流动的电流量的变化而改变的曲线图。曲线图的水平轴表示与OLED的阴极连接的地电源的电压,垂直轴表示从阳极流到阴极的电流的量。
参照图1,当饱和电流为150mA时,OLED在阴极的电压为0V至-1V时在饱和区域中工作。当饱和电流为200mA时,OLED在阴极的电压为-1V至-2V时在饱和区域中工作。另外,当饱和电流为250mA时,OLED在阴极的电压低于-2V时在饱和区域中工作。
换句话说,阴极的电压根据饱和电流的值而变化。因此,OLED被设计成使用与饱和电流对应的部分来发光。
然而,有机发光显示器中的OLED的阴极的电压通常被设定为与饱和电流为最大的情况对应的电压。换句话说,虽然在有机发光显示器显示的所有图像中仅有很少的图像是以需要最大饱和电流的最高灰度级而显示的,但是阴极的电压被设定为与饱和电流为最大的情况对应的电压。因此,驱动电压比所需要的电压高,从而导致功耗增大。
发明内容
本发明的实施例提供了一种用于降低功耗的有机发光显示器及其驱动方法。
根据本发明的第一实施例,提供了一种有机发光显示器,所述有机发光显示器包括:显示单元,被构造成响应于从第一电源经过所述显示单元流到第二电源的电流而发射光,所述电流与数据信号和扫描信号对应;数据驱动器,通过接收视频信号产生所述数据信号,并将所述数据信号传递到所述显示单元;扫描驱动器,将所述扫描信号提提供所述显示单元;电源单元,具有用于输出所述第一电源的第一功率的第一输出端和用于输出所述第二电源的第二功率的第二输出端,所述电源单元被构造成将所述第一功率和所述第二功率输出到所述显示单元;驱动电压计算单元,计算与所述电流对应的第二功率的电压,其中,通过所述第二输出端输出所述电压。
根据本发明的第二实施例,提供了一种有机发光显示器的驱动方法,所述驱动方法包括以下步骤:接收与帧对应的输入视频信号;确定与所述输入视频信号中的最亮的视频信号对应的最大视频信号;确定与所述最大视频信号对应的驱动电源的电压;通过所述驱动电源的输出端将所述电压输出到所述有机发光显示器的显示单元。
根据本发明的第三实施例,提供了一种有机发光显示器,所述有机发光显示器包括:显示单元,显示图像;电源单元,在第一输出端将第一功率提供到所述显示单元,并在第二输出端将第二功率提供到所述显示单元,所述第二功率的电压电平比所述第一功率的电压电平低;驱动电压计算单元,被构造成调节所述第二功率的电压电平,以使所述第二功率的电压电平与所述图像的最大亮度水平对应。
附图说明
附图与说明书一起对本发明的示例性实施例进行举例说明,并与描述一起用于解释本发明的原理。
图1是示出了OLED的饱和点按照流经OLED的电流量的变化而改变的曲线图;
图2是根据本发明实施例的有机发光显示器的示意性框图;
图3是根据本发明实施例的图2的有机发光显示器的驱动电压计算单元的框图;
图4是示出了根据本发明实施例的图2的有机发光显示器的电源单元的示意图;
图5是示出了根据本发明实施例的图2的有机发光显示器的伽玛校正单元的示意性框图。
具体实施方式
在下文中,将参照附图描述根据本发明的特定示例性实施例。这里,当第一元件被描述为结合到第二元件时,第一元件可以直接地结合到第二元件,或可选地,第一元件可以经由第三元件间接地结合到第二元件。此外,为了清楚起见,略去了对于完全理解本发明来说不必需的一些元件。另外,相同的标号始终表示相同的元件。
在下文中,将参照附图描述根据本发明的示例性实施例。
图2是根据本发明实施例的有机发光显示器的示意性框图。参照图2,有机发光显示器包括显示单元100、数据驱动器200、扫描驱动器300、伽玛校正单元400、电源单元500和驱动电压计算单元600。
显示单元100包括多个像素101,其中,每个像素101包括OLED(未示出),OLED对应于电流的流动而发光。另外,显示单元100包括用于传递扫描信号的沿行方向延伸的n条扫描线S1、S2、...、Sn-1和Sn以及用于传递数据信号的沿列方向延伸的m条数据线D1、D2、...、Dm-1和Dm。
通过从电源单元500接收第一功率ELVDD和第二功率ELVSS来驱动显示单元100。因此,显示单元100根据扫描信号、数据信号、驱动功率和接地功率来发射与流经OLED的电流的量对应的光,从而显示图像。
数据驱动器200通过向分别具有红色分量、绿色分量和蓝色分量的视频信号红色(R)数据、视频信号绿色(G)数据和视频信号蓝色(B)数据施加伽玛校正值(gamma)等来产生数据信号。然后,数据驱动器200将所产生的数据信号施加到与数据线D1、D2、...、Dm-1和Dm连接的显示单元100。
产生扫描信号的扫描驱动器300连接到扫描线S1、S2、...、Sn-1和Sn,从而将扫描信号传递到显示单元100的特定行的像素101。由扫描信号选择的像素101接收从数据驱动器200输出的数据信号,从而通过每个所选的像素101产生驱动电流。所产生的驱动电流流经所选的像素101的OLED。
伽玛校正单元400通过将伽玛校正值(gamma)传递到数据驱动器200来校正视频信号。如果显示装置通过对根据视频信号的亮度性质输入的视频信号进行直接处理来显示图像,那么未显示出实际预期的亮度。为了解决这样的问题,根据每个灰度级来控制亮度,其中,将这样的校正称为伽玛校正。另外,伽玛校正单元400将伽玛校正值传递到驱动电压计算单元600。
电源单元500产生驱动电压,并将驱动电压传递到显示单元100、数据驱动器200和扫描驱动器300等。第一功率ELVDD和第二功率ELVSS与传递到显示单元100的驱动功率对应。
驱动电压计算单元600通过使用输入到数据驱动器200的视频信号来确定提供第二功率ELVSS的第二电源的电压。在本发明的一些实施例中,驱动电压计算单元600通过使用对应于一帧而输入的R、G和B视频信号以及伽玛校正值(gamma)来计算在一个图像帧中流经像素101的电流的最大量。另外,驱动电压计算单元600计算每一帧的最佳驱动电压。
因此,按照帧来控制有机发光显示器的驱动功率,从而可以降低功耗。例如,当有机发光显示器显示运动画面时,以高灰度级显示的帧的数量相对很少,因此,节电效果会更加明显。
图3是根据本发明实施例的包括在图2的有机发光显示器中的驱动电压计算单元的框图。参照图3,驱动电压计算单元600包括信号感测单元610、电流估计单元620、计算单元630和电压控制单元640。
信号感测单元610在每一帧输入的R、G和B视频信号数据中确定在一帧中输入的最大的R视频信号、G视频信号和B视频信号。最大的视频信号与在一帧中输入的视频信号中的最亮的视频信号(即,具有最大灰度级值的视频信号)对应。
电流估计单元620通过使用伽玛校正值(gamma)和在信号感测单元610中确定的最大的R、G和B视频信号来确定流经像素101的最大电流。
计算单元630通过使用在电流估计单元620中确定的最大电流来计算第二电源的输出电压。计算单元630包括查询表631,查询表631存储与最大电流对应的第二电源的输出电压的值。当所确定的最大电流为大时,计算单元630降低第二电源的驱动电压。当所确定的最大电流为小时,计算单元630升高第二电源的驱动电压。
电压控制单元640输出与在计算单元630中确定的驱动电压的电平对应的电压控制信号Vctr。第一电源提供电压ELVDD,第二电源提供电压ELVSS,电压控制信号Vctr控制第二电源的电压ELVSS。换句话说,电压控制单元640控制第二电源的电压,以使第二电源的电压与将从电源单元500输出的最大电流量对应。
图4是示出了根据本发明实施例的图2的有机发光显示器的电源单元500的示意图。
参照图4,电源单元500接收输入电压Vin和从电压控制单元640输出的电压控制信号Vctr,并通过第一输出端out1和第二输出端out2输出电压。通过第二输出端out2输出的电压变成第二功率ELVSS。第二输出端out2连接到可变电阻器,可变电阻器连接到电压控制端Ctr。通过电压控制端Ctr的输出信号来控制可变电阻器的电阻,从而控制输出到第二输出端out2的电压。将可变电阻器的电阻比控制在R1:R2。
图5是示出了根据本发明实施例的图2的有机发光显示器的伽玛校正单元400的示意性框图。参照图5,伽玛校正单元400包括梯形电阻器61、幅值控制寄存器62、曲线控制寄存器63、第一选择器64至第六选择器69以及灰度级电压放大器70。
梯形电阻器61包括在最高电平电压VHI、从伽玛校正单元400的外部提供的基准电压和最低电平电压VLO之间串联连接的多个可变电阻器。通过梯形电阻器61产生多个灰度级电压。当梯形电阻器61的电阻值为小时,幅值控制范围变窄,但控制精确度提高。相反,当梯形电阻器61的电阻值为大时,幅值控制范围变宽,但控制精确度降低。
幅值控制寄存器62将3位寄存器设定值输出到第一选择器64,并将7位寄存器设定值输出到第二选择器65。可以通过提高设定位的数量来增加可选择的灰度级的数量,并可以通过改变寄存器设定值来选择不同的灰度级电压。
曲线控制寄存器63将4位寄存器设定值输出到第三选择器66、第四选择器67、第五选择器68和第六选择器69。可以改变寄存器设定值,并可以根据寄存器设定值来控制可选择的灰度级电压。
伽玛校正值由26位信号构成,其中,高10位被输入到幅值控制寄存器62,低16位被输入到曲线控制寄存器63,从而被选为寄存器设定值。
第一选择器64在通过梯形电阻器61分布的多个灰度级电压中选择与在幅值控制寄存器62中设定的3位寄存器设定值对应的灰度级电压,并将它作为最高灰度级电压输出。
第二选择器65在通过梯形电阻器61分布的多个灰度级电压中选择与在幅值控制寄存器62中设定的7位寄存器设定值对应的灰度级电压,并将它作为最低灰度级电压输出。
第三选择器66通过多个电阻器列将在从第一选择器64输出的灰度级电压和从第二选择器65输出的灰度级电压之间的电压分布成多个灰度级电压,并选择与4位寄存器设定值对应的灰度级电压,并输出所选择的灰度级电压。
第四选择器67通过多个电阻器列将在从第一选择器64输出的灰度级电压和从第三选择器66输出的灰度级电压之间的电压分布成多个灰度级电压,并选择与4位寄存器设定值对应的灰度级电压,并输出所选择的灰度级电压。
第五选择器68在第一选择器64和第四选择器67之间的灰度级值中选择与4位寄存器设定值对应的灰度级电压,并输出所选择的灰度级电压。
第六选择器69在第一选择器64和第五选择器68之间的多个灰度级值中选择与4位寄存器设定值对应的灰度级电压,并输出所选择的灰度级电压。
采用以上操作,可以根据曲线控制寄存器63的寄存器设定值来控制中间灰阶单元的曲线。因此,可以根据每个发光装置的性质容易地控制伽玛性质。另外,为了控制伽玛曲线性质向下凸出,例如,当显示小的灰度级时,可以将每个灰度级之间的电位差设定为大。相反,为了控制伽玛曲线性质向上凸出,例如,适当地构造每个梯形电阻器61的电阻值,使得当显示小的灰度级时,每个灰度级之间的电位差为小。
灰度级电压放大器70输出与将要显示在显示单元100上的多个灰度级中的每个灰度级对应的多个灰度级电压。
考虑到R、G和B发光装置的不同性质,可以针对R、G和B像素组使用伽玛校正电路来执行上述操作,因此,R、G和B像素可以获得几乎相同或相似的亮度性质。因此,针对R、G和B像素,可以通过幅值控制寄存器62和曲线控制寄存器63来不同地设定幅值和曲线。
在根据本发明实施例的有机发光显示器及其驱动方法中,根据流经像素的电流来控制驱动电压,从而能够降低有机发光显示器的功耗。例如,当显示运动画面时,以高灰度级显示的帧的数量很少,从而可以更加明显地显示出节电效果。
虽然已经结合特定示例性实施例描述了本发明,但应当理解的是,本发明不限于所公开的实施例,而是相反,本发明旨在涵盖包括在权利要求及其等同物的精神和范围内的各种修改和等同布置。

Claims (17)

1、一种有机发光显示器,包括:
显示单元,被构造成响应于从第一电源经过所述显示单元流到第二电源的电流而发射光,所述电流与数据信号和扫描信号对应;
数据驱动器,通过接收视频信号产生所述数据信号,并将所述数据信号传递到所述显示单元;
扫描驱动器,将所述扫描信号提提供所述显示单元;
电源单元,具有用于输出所述第一电源的第一功率的第一输出端和用于输出所述第二电源的第二功率的第二输出端,所述电源单元被构造成将所述第一功率和所述第二功率输出到所述显示单元;
驱动电压计算单元,计算与所述电流对应的第二功率的电压,
其中,通过所述第二输出端输出所述电压。
2、如权利要求1所述的有机发光显示器,其中,所述驱动电压计算单元被构造成利用所述视频信号确定所述电流。
3、如权利要求1所述的有机发光显示器,其中,所述驱动电压计算单元包括:
信号感测单元,接收图像帧的多个视频信号,并被构造成确定所述视频信号中的最亮的视频信号;
电流估计单元,确定与所述最亮的视频信号和伽玛校正值对应的所述电流;
计算单元,计算与所述电流对应的第二功率的电压;
电压控制单元,控制所述电源单元,从而在所述第二输出端输出由所述计算单元确定的第二功率的电压。
4、如权利要求3所述的有机发光显示器,其中,所述信号感测单元被构造成分别确定所述视频信号的红色视频信号、绿色视频信号和蓝色视频信号的最大视频信号。
5、如权利要求3所述的有机发光显示器,其中,所述计算单元还包括:查询表,存储与所述电流对应的第二功率的电压的值。
6、如权利要求1所述的有机发光显示器,其中,当所述电流增大时,所述第二电源被构造成降低其电压。
7、如权利要求1所述的有机发光显示器,其中,所述电源单元的第二输出端结合到可变电阻器,所述可变电阻器由所述驱动电压计算单元控制,以控制从所述第二输出端输出的第二功率的电压。
8、一种有机发光显示器的驱动方法,包括以下步骤:
接收与帧对应的输入视频信号;
确定与所述输入视频信号中的最亮的视频信号对应的最大视频信号;
确定与所述最大视频信号对应的驱动电源的电压;
通过所述驱动电源的输出端将所述电压输出到所述有机发光显示器的显示单元。
9、如权利要求8所述的有机发光显示器的驱动方法,其中,通过接收第一功率和第二功率驱动所述显示单元,所述第二功率的电压电平比所述第一功率的电压电平低,所述驱动电源提供所述第二功率。
10、如权利要求8所述的有机发光显示器的驱动方法,其中,所述最大视频信号包括红色视频信号、绿色视频信号和蓝色视频信号。
11、如权利要求8所述的有机发光显示器的驱动方法,其中,所述驱动电源的电压输出到所述驱动电源的结合到可变电阻器的输出端,所述驱动电源控制所述可变电阻器,以使所述可变电阻器与所述驱动电源的电压对应。
12、如权利要求8所述的有机发光显示器的驱动方法,其中,确定所述驱动电源的电压,使所述驱动电源的电压与所述最大视频信号和伽玛校正值对应。
13、如权利要求12所述的有机发光显示器的驱动方法,其中,根据查询表确定所述驱动电源的电压,所述查询表存储所述驱动电源的与所述最大视频信号和所述伽玛校正值对应的电压的值。
14、一种有机发光显示器,包括:
显示单元,显示图像;
电源单元,在第一输出端将第一功率提供到所述显示单元,并在第二输出端将第二功率提供到所述显示单元,所述第二功率的电压电平比所述第一功率的电压电平低;
驱动电压计算单元,被构造成调节所述第二功率的电压电平,以使所述第二功率的电压电平与所述图像的最大亮度水平对应。
15、如权利要求14所述的有机发光显示器,其中,所述驱动电压计算单元包括:
信号感测单元,接收与所述图像对应的多个视频信号,并被构造成确定所述视频信号中的最亮的视频信号;
电流估计单元,确定与所述最亮的视频信号和伽玛校正值对应的用于驱动所述显示单元的电流;
计算单元,计算与所述电流对应的第二功率的电压;
电压控制单元,控制所述电源单元,从而将由所述计算单元确定的第二功率的电压输出到所述第二输出端。
16、如权利要求15所述的有机发光显示器,其中,所述信号感测单元被构造成分别确定所述图像的红色视频信号、绿色视频信号和蓝色视频信号的最大视频信号。
17、如权利要求15所述的有机发光显示器,其中,所述计算单元还包括:查询表,存储与所述电流对应的第二功率的电压的值。
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JP4622389B2 (ja) 2004-08-30 2011-02-02 ソニー株式会社 表示装置及びその駆動方法
JP2006091681A (ja) 2004-09-27 2006-04-06 Hitachi Displays Ltd 表示装置及び表示方法
KR100707640B1 (ko) 2005-04-28 2007-04-12 삼성에스디아이 주식회사 발광 표시장치 및 그 구동 방법
WO2007004155A2 (en) 2005-07-04 2007-01-11 Koninklijke Philips Electronics N.V. Oled display with extended grey scale capability
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JP5449641B2 (ja) * 2006-04-17 2014-03-19 グローバル・オーエルイーディー・テクノロジー・リミテッド・ライアビリティ・カンパニー 表示装置
KR20070109030A (ko) 2006-05-09 2007-11-15 삼성에스디아이 주식회사 전자방출표시소자 및 그의 구동방법
RU2435336C2 (ru) * 2006-08-17 2011-11-27 Конинклейке Филипс Электроникс Н.В. Способ и устройство для снижения термического напряжения в светоизлучающих элементах
JP2009162980A (ja) 2008-01-07 2009-07-23 Panasonic Corp 表示モジュール、表示装置および表示方法

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CN102347000A (zh) * 2010-07-23 2012-02-08 群康科技(深圳)有限公司 有机发光二极管面板及其功率控制方法及设备
CN102347000B (zh) * 2010-07-23 2014-02-19 群康科技(深圳)有限公司 有机发光二极管面板及其功率控制方法及设备
CN102737577A (zh) * 2011-04-08 2012-10-17 三星移动显示器株式会社 有机发光显示器及其驱动方法
CN102737577B (zh) * 2011-04-08 2016-09-28 三星显示有限公司 有机发光显示器及其驱动方法
US9691323B2 (en) 2011-04-08 2017-06-27 Samsung Display Co., Ltd. Organic light emitting display and method of driving the same
CN102956173A (zh) * 2011-08-17 2013-03-06 联咏科技股份有限公司 显示器的驱动装置及其驱动方法
CN103680401A (zh) * 2012-08-31 2014-03-26 三星显示有限公司 伽马补正曲线生成方法、伽马补正单元及显示装置
CN104900180A (zh) * 2015-07-01 2015-09-09 京东方科技集团股份有限公司 一种源极驱动电路及其驱动方法、显示装置
CN104900180B (zh) * 2015-07-01 2018-02-13 京东方科技集团股份有限公司 一种源极驱动电路及其驱动方法、显示装置
CN108648723A (zh) * 2018-05-14 2018-10-12 昆山国显光电有限公司 降低显示屏功耗的方法和电路、显示屏及电子终端
CN111432520A (zh) * 2020-04-02 2020-07-17 广东晟合技术有限公司 一种低功耗驱动oled面板的均衡方法
CN111432520B (zh) * 2020-04-02 2022-04-19 晟合微电子(肇庆)有限公司 一种低功耗驱动oled面板的均衡方法

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