CN1675673A - 显示设备 - Google Patents

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CN1675673A
CN1675673A CNA038193493A CN03819349A CN1675673A CN 1675673 A CN1675673 A CN 1675673A CN A038193493 A CNA038193493 A CN A038193493A CN 03819349 A CN03819349 A CN 03819349A CN 1675673 A CN1675673 A CN 1675673A
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display driver
voltage
display
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output
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CN1675673B (zh
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A·赛佩
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Koninklijke Philips NV
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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
    • 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
    • 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
    • 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]
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • 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
    • G09G2330/04—Display protection
    • 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
    • G09G3/3233—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 current through the light-emitting element
    • G09G3/3241—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 current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror

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  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
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  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

在发光显示器的驱动器中监控驱动器电路的工作电压以防止由于该驱动器电路的开放输出连接(28)而产生额外损耗。该监控也用于最小化功耗。

Description

显示设备
本发明涉及包括至少一个图像元件的显示设备以及与图像元件串联的驱动晶体管的显示驱动设备。
这样的显示设备日益基于场致发光的半导体有机材料(也称为发光二极管(多LED或OLED))。该显示器设备可以经由分段像素(或固定模式)发光，但通过矩阵模式的显示器是可能的。二极管电流的调整一般确定由像素发出的光的强度。
适合应用显示设备的领域包括诸如移动电话、组织器等。
在美国专利6014119中描述了在本文的开始段落中描述的类型的显示设备。在所述文件中，通过电流控制来调节通过LED的电流。对于在发光像素矩阵中的每列像素，提供包括双极晶体管和电阻器的电流驱动器，将其作为驱动电路的一部分。可使用MOS晶体管或TFT晶体管替代该双极晶体管。
为了获得可再现的灰度级，某个灰度值的电流必须基本恒定。这就是为什么一般在恒流区内使用晶体管的原因。在此情况下使用高的漏极-源极电压(或在双极晶体管的情况下是发射极-集电极电压)。这使晶体管的偏压对于漏极电压的变化不太敏感，漏极电压的变化是由于诸如像素二极管的正向特性的变化或驱动器的电源电压的变化所引起。
然而，由于驱动器电路的输出的数量可能大于配置有驱动电流的列的数量，在显示设备和显示驱动器电路的大量生产中就出现问题。例如，当驱动电路中提供的信息(比如位于显示器边缘的列)不是显示的合适的图像所必需时，或者当显示器中列的数量小于驱动器电路中可用的列驱动器输出的数量时，可以使这些输出驱动器工作。由于输出驱动器用作电流源，其输出节点的电压迅速增加(或降低)，通过电源电压限制该增加。如果列连接出现故障则发生类似的增加。监控输出节点上的电压以维持电源节点和输出节点之间的某个电压值以保持某个工作区中的电流供给。现在，如果一个输出节点的电压增加，电源节点电压也就增加，由此引起输出节点增加等。
这就导致在显示设备和显示驱动器电路中的过度损耗。
此外，由于温度改变，输出电流(或输出节点电压)可能变化，而不同的列驱动器(和不同的列)的性能也可能不同。
其中，本发明的目的是提供在开始段落中所描述的类型的显示设备，在该显示设备中，输出节点电压中和损耗的变化是最小的，尤其地，在该显示设备中，尽可能地防止由于开驱动器输出节点(opendriver output node)而产生的额外功耗。为此，在根据本发明元件的显示设备中，显示驱动器设备包括用于监控显示驱动器设备的输出电压的装置(例如，用于发信号通知在输出电压值将到达阈值电压)。
根据本发明的显示设备的优选实施例包括控制显示驱动器设备的参考电压的反馈机构。该参考电压一般是电源节点电压，也可以是直接或间接确定所述电源节点电压或任何其它适合的电压节点的电压。经由反馈机构，电源节点和输出节点之间的电压值基本保持恒定(在这样一个值；电流供给保持在某个工作区(恒流区))，而不将该电压设为过高的值。为此，优选地，该反馈机构包括控制电路，该控制电路发信号通知在图像元件的显示驱动器设备的输出电压和参考电压之间的差值低于阈值电压。为了防止由于开驱动器输出节点而产生的额外功耗，显示驱动器设备包括用于在发信号通知之后检测显示驱动器设备的开输出(open output)的装置。
在优选实施例中，用于检测显示驱动器设备的开输出的装置包括电流通路，其包括用于监控输出电压的装置的一部分。所述用于检测的装置可包括位于参考电压和显示驱动器设备的输出之间的电流通路中的开关或位于参考电压和显示驱动器设备的输出之间的电流通路中的熔丝。
参考下文中描述的实施例，本发明的这些和其它方面变得明显和清楚。
附图中：
图1用图解的方式示出按照本发明的显示设备，
图2示出在图1的实施例中使用的晶体管的晶体管特性，
图3示出本发明的实施例，而
图4和5示出按照本发明的驱动器电路的其它实施例，以及
附图和图解；相应部分一般用相同的标号表示。
图1用图解方式示出按照本发明的显示设备1的一部分的等效电路图。该显示设备包括具有m行(1，2，...，m)和n列(1，2，...，n)的(P)LED或(O)LED4。该设备还包括行选择电路6和数据寄存器5。在处理单元8中处理外部提供的信息7(例如视频信号)，该处理单元根据要显示的信息经由线路9加载(charge)数据寄存器5的独立部分5-1，...，5-n。
通过行选择电路6经由线路3(在本例中通过为所述线路供应所需要的选择电压(被动定址))进行行选择。
写数据发生，其中在选择期间，通过数据寄存器5，例如经由开关(未示出)，接通电流源10(可认为是理想电流源)。通过数据寄存器的内容确定电流值，并经由电压馈送线11和数据线路2将该电流值提供给LED4。可从外部提供电压线11，或从处理单元8内的电压中引出电压线11。
电流开关10可以是简单类型的电流开关，每个只包括一个晶体管和一个电阻。如在引言中解释的，为了使晶体管的偏压对于漏极电压的变化不敏感，一般在恒流区中使用该晶体管，漏极电压的变化是由于例如像素二极管的正向特性的变化或驱动器的电源电压的变化所引起。然而，那时所需要的高的漏极-源极增加了功耗，尤其是当不同的列的驱动性能不同的时候。后者会导致不一致的发射性能。。
根据本发明的第一方面，显示驱动器设备(在本例中包括行选择电路6、数据寄存器5、处理单元8和电流驱动器10)也包括监控电路，在本例中是运算放大器13，用于监控其输出电压并经由反馈机构控制显示驱动器设备的参考电压。尽管显示为独立部件，该运算放大器13一般组成处理单元8的一部分。通过互连12监控工作电压VOP的值。为了将驱动器中的损耗保持在低水平，在点X上偏置Vds值，这允述在此Vds值上的(最大)I0值(见图2)。经由运算放大器将电压线11上的电压Vsupply维持在VOP+Vds。由于电压VOP可能示出一些变化，而处理单元8趋近于将电压线11维持在VOP，max+Vds，因而工作点x将漂移到更高的电压(如图2中的箭头14所示)。这可用于在处理器8中仅通过将VOP，max与参考电压比较来检测显示器(显示驱动器设备)的寿命终止。可在处理器8内部产生或由外部供应参考电压。在检测到VOP越过某个阈值之后，处理器8产生寿命终止信号。
当输出驱动器(电流源10)的数量超过第2列的数量时，监控最好用于使显示驱动器设备适应显示设备1，而不是仅产生寿命终止信号。如果电流源10中的一个保持不与列(在图1的示例中，显示为列n)连接，它的电流为零，因此在点O上趋近于偏置Vds值，并且VOP趋近于Vsupply值。经由运算放大器13，电压线11现在经由正反馈机构趋近于无限增加(虽然外部提供的电压限制该增长)。
然而，根据本发明，将与上述类似的检测机构结合在处理器8中，它进一步阻止VOP增加到某个阈值(例如，当VOP，max接近V电源-Vds，min值时)
图3示出更详细的实施例，其具有两个电流源10，一个与LED互连，另一个具有(开)输出28。每个电流源包括晶体管21和两个串联的电阻器22、23，将它们的公共点与检测电路24，24’互连，为检测电路24，24’提供输入电压Vin。在该检测电路24，24’中，监控通过电流源的电流，并将该电流与上述的某个阈值进行比较。互连12经由晶体管27和26、26’控制电压线11以将其电压保持在VOP，max+Vds。在开输出的情况下，清楚的是，通过电流源的电流为零，因此保持Vin＝Vsupply或Vin＝Vsource。一旦在例如检测电路24’(其对应于开放输出28)中检测到到这个，打开开关26’，并且中断控制机构，因此在所述的反馈机构中，开输出28不再起作用。
例如通过图4的电路检测开放输出，其中检测电路24包括差动放大器，具有电流源30、两个晶体管31以及在本例中电阻值为R的两个电阻器。如果在晶体管21中没有电流流过，两个电阻器22、23的公共点的电压与电压线11上的电压相等，因此在两个晶体管31中流过的电流为电流I30的一半，这导致输出33上的电压为VOP，max+Vds-1/2I30.R。将该电压值选择在打开对应开关26’的值。
通过随后经由晶体管21的栅极端子选择晶体管21，同时将其漏极端子连接到适合的电压并保持所有其它的晶体管21断开，随后也可为列输出供应某个电流I(最好接近Imax)以测试所有的列输出。
尤其是，如果不使用多个列、并且驱动器不打算供其它多个列任何(其它)使用，在晶体管21和输出28(图5)之间引入熔丝40可能是足够的。多余的输出数可以通过选择相应的晶体管21并向它们对应的互连12和电压线11供应合适的电压而被除去。
本发明的保护范围不限于所述的实施例。本发明适用于有源和无源器件、矩阵和分段显示设备。由于驱动设备可用于不同种类的显示设备(大小、损耗、电压)，被监控的参考电压或电压差值是可编程的。本发明也适用于场致发射设备和基于电流驱动的其它设备。
本发明存在于每个新颖的特性特征和每个特征的组合中。权利要求书中的标号并不限制权利要求的保护范围。动词“包括”和其变形的使用不排除除权利要求书中所提到的元件以外的元件的存在。在元件前面使用的词“一个”不排除多个这种元件的存在。

Claims (16)

1.一种显示设备，包括多个图像元件和显示驱动器设备，所述显示驱动器设备包括与所述图像元件串联的驱动晶体管，所述显示驱动器设备包括用于监控所述显示驱动器设备的输出电压的装置。
2.如权利要求1的显示设备，其包括用于发信号通知输出电压值到达阈值电压的装置。
3.如权利要求2所述的显示设备，其具有位于所述驱动晶体管和所述图像元件之间的熔断装置。
4.如权利要求1所述的显示设备，其包括反馈机构以控制所述显示驱动器设备的参考电压。
5.如权利要求2所述的显示设备，所述反馈机构还包括控制电路，所述控制电路发信号通知图像元件的显示驱动器设备的输出电压和所述参考电压之间的差值低于阈值电压。
6.如权利要求5所述的显示设备，所述显示驱动器设备包括在所述发信号通知之后检测所述显示驱动器设备的开输出的装置。
7.如权利要求5所述的显示设备，所述显示驱动器设备包括差动放大器。
8.如权利要求4所述的显示设备，由电流源驱动所述图像元件，所述反馈机构将图像元件的显示驱动器设备的输出电压和所述参考电压之间的差值保持基本不变。
9.如权利要求1所述的显示设备，所述图像元件是发光元件，第一电流确定所述发光元件的发光。
10.一种显示驱动器设备，其包括与图像元件串联的驱动晶体管，所述显示驱动器设备包括用于监控所述显示驱动器设备的输出电压的装置。
11.如权利要求10所述的显示驱动器设备，其包括用于发信号通知输出电压值到达阈值电压的装置。
12.如权利要求11所述的显示驱动器设备，其具有位于所述驱动晶体管和所述显示驱动器设备的输出连接之间的熔断装置。
13.如权利要求10所述的显示驱动器，其还包括反馈机构以控制所述显示驱动器设备的参考电压。
14.如权利要求13所述的显示驱动器，所述反馈机构还包括控制电路，所述控制电路发信号通知图像元件的显示驱动器设备的输出电压和所述参考电压之间的差值低于阈值电压。
15.如权利要求10所述的显示驱动器，该显示驱动器设备包括差动放大器，用于在所述发信号通知之后用于检测所述显示驱动器设备的开输出。
16.如权利要求15所述的显示驱动器，其还包括位于所述参考电压和所述显示驱动器设备的输出之间的电流通路中的开关。
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