CN101859532A - 显示装置 - Google Patents

显示装置 Download PDF

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CN101859532A
CN101859532A CN201010156594A CN201010156594A CN101859532A CN 101859532 A CN101859532 A CN 101859532A CN 201010156594 A CN201010156594 A CN 201010156594A CN 201010156594 A CN201010156594 A CN 201010156594A CN 101859532 A CN101859532 A CN 101859532A
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contact portion
pixel
driving transistors
conductive layer
display device
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CN101859532B (zh
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尾本启介
冨田昌嗣
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Sony Corp
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    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10OLED displays
    • H10K59/12Active-matrix OLED [AMOLED] displays
    • H10K59/121Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
    • H10K59/1216Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements the pixel elements being capacitors
    • 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
    • G09G3/3233Control 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
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/02Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
    • H01L27/12Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
    • H01L27/1214Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
    • H01L27/124Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/02Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
    • H01L27/12Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
    • H01L27/1214Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
    • H01L27/1255Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs integrated with passive devices, e.g. auxiliary capacitors
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10OLED displays
    • H10K59/12Active-matrix OLED [AMOLED] displays
    • H10K59/121Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
    • H10K59/1213Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements the pixel elements being TFTs
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10OLED displays
    • H10K59/12Active-matrix OLED [AMOLED] displays
    • H10K59/123Connection of the pixel electrodes to the thin film transistors [TFT]
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10OLED displays
    • H10K59/12Active-matrix OLED [AMOLED] displays
    • H10K59/131Interconnections, e.g. wiring lines or terminals
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/04Structural and physical details of display devices
    • G09G2300/0421Structural details of the set of electrodes
    • G09G2300/0426Layout of electrodes and connections
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809Several active elements per pixel in active matrix panels
    • G09G2300/0819Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809Several active elements per pixel in active matrix panels
    • G09G2300/0842Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0852Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor being a dynamic memory with more than one capacitor
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809Several active elements per pixel in active matrix panels
    • G09G2300/0842Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • G09G2300/0866Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes by means of changes in the pixel supply voltage
    • 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
    • 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
    • G09G3/3291Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
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    • H01L27/02Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
    • H01L27/12Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
    • H01L27/1214Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
    • H01L27/1222Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or crystalline structure of the active layer

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  • Condensed Matter Physics & Semiconductors (AREA)
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  • Electroluminescent Light Sources (AREA)
  • Control Of El Displays (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

本发明涉及一种显示装置。该显示装置包括具有设置成矩阵的多个像素的面板,且每个像素包括用于发光的自发光元件,该面板包括依次层叠在支撑基板上的第一到第三导电层,第一导电层与第二导电层之间的第一接触部分以及第二导电层与第三导电层之间的第二接触部分在平面方向上设置在相同的位置处。

Description

显示装置
技术领域
本发明涉及一种显示装置,更具体地,涉及一种包括具有两个接触部分的导电层的显示装置。
背景技术
近几年来,已经且正在对采用有机电致发光(EL)器件作为发光元件的平面自发光型面板进行积极的研究。有机EL器件具有二极管特性且利用这样的现象:如果电场施加到有机薄膜,有机薄膜便发光。因为有机EL器件由小于或等于10V的施加电压驱动且其自身发光,所以其是功耗低的自发光器件。因此,有机EL器件具有不需要照明构件且重量和厚度易于降低的特性。此外,因为有机EL器件达到约几μs的高响应速率,所以EL面板具有优点:显示动态图像时不出现余象(after-image)。
在各种EL面板中,正积极进行对有源矩阵型面板(其中薄膜晶体管(TFT)作为驱动元件在每个像素中以集成态形成)的研究。例如,日本专利特开第2003-255856、2003-271095、2004-133240、2004-029791和2004-093682中公开了有源矩阵EL面板。
近几年来,需要增强有源矩阵EL面板的清晰度。
发明内容
然而,在已知的有源矩阵EL面板中,在必须采用一个导电层以建立两个其他的导电层之间的接触的情况下,两个接触部分在平面方向上设置在彼此分离的位置处,从而防止接触故障。因此,具有两个接触部分的导电层必须具有大的面积,且一个像素的区域不能有效地被利用。
因此,期望提供一种其中具有两个接触部分的一个导电层的面积可以减小的显示装置。
根据本发明的实施例,提供了一种显示电路,该显示电路包括具有多个像素的面板,该多个像素设置成矩阵且每个像素包括用于发光的自发光元件,该面板包括依次层叠在支撑基板上的第一到第三导电层,第一导电层与第二导电层之间的第一接触部分以及第二导电层与第三导电层之间的第二接触部分在平面方向上设置在相同的位置处。
在显示装置中,包括在面板中的第一到第三导电层依次层叠在支撑基板上,其中在面板上以矩阵方式设置有像素并且每个像素都具有用于发光的自发光元件。此外,第一导电层与第二导电层之间的第一接触部分以及第二导电层与第三导电层之间的第二接触部分在平面方向上设置在相同的位置处。
对于该显示装置,可以减小导电层中具有两个接触部分的导电层的面积。
附图说明
图1是示出应用本发明实施例的显示装置的构造的示例的框图;
图2是示出图1中示出的EL面板的像素的颜色阵列的框图;
图3是示出图1的显示装置的像素的等效电路的构造的框图;
图4是示出图1的显示装置的面板的操作的时序图;
图5是迄今已知的EL面板的驱动晶体管的示意性截面图;
图6是示出出现在膜中的台阶的示意性截面图;
图7是形成迄今已知的EL面板的像素的平面图;
图8和9是图1的EL面板的第一和第二实施例中的像素的驱动晶体管的截面图;
图10是图9所示的接触部分的顶部平面图;以及
图11是图1所示的EL面板的平面图。
具体实施方式
[显示装置的构造]
图1示出应用本发明实施例的显示装置的构造的示例。
参考图1,所示出的显示装置1是例如电视机且相应于所输入的图像信号在EL面板100上显示图像。EL面板100采用作为自发光元件的有机EL(电致发光)器件。在显示装置1中,EL面板100合并为面板模块,该面板模块包括驱动器IC(集成电路),而该驱动器IC包括源极驱动器和栅极驱动器。显示装置1还包括电源电路、图像LSI(大规模集成电路)和未示出的部件等。应该注意的是,显示装置1的EL面板100也可以用作便携式电话机、数字照相机、数字摄影机、打印机等的显示部分。
EL面板100包括:像素阵列部分102,具有多个像素101;水平选择器(HSEL)103;写扫描器(WSCN)104和电源扫描器(DSCN)105。
在像素阵列部分102中,N×M(N和M是大于1的整数且彼此独立)个像素101-(1,1)到101-(N,M)设置成阵列。应该注意的是,因为图示的限制,图1中仅示出像素101-(1,1)到101-(N,M)中的一些。
EL面板100还包括M条扫描线WSL10-1到WSL10-M、M条电源线DSL10-1到DSL10-M以及N条图像信号线DTL10-1到DTL10-N。
应该注意的是,在以下说明中,在没有必要明确地区分扫描线WSL10-1到WSL10-M的情况下,扫描线WSL10-1到WSL10-M中的每个被简单地称为扫描线WSL10。此外,在没有必要明确地区分图像信号线DTL10-1到DTL10-N的情况下,图像信号线DTL10-1到DTL10-N中的每个被简单地称为图像信号线DTL10。此外,在没有必要明确地区分像素101-(1,1)到101-(N,M)和电源线DSL10-1到DSL10-M的情况下,它们中的每个被分别简单地称为像素101和电源线DSL10。
水平选择器103、写扫描器104和电源扫描器105用作用于驱动像素阵列部分102的驱动部分。
像素101-(1,1)到101-(N,M)中的第一行像素101-(1,1)到101-(N,1)分别通过扫描线WSL10-1和电源线DSL10-1连接到写扫描器104和电源扫描器105。此外,像素101-(1,1)到101-(N,M)中的第M行像素101-(1,M)到101-(N,M)分别通过扫描线WSL10-M和电源线DSL10-M连接到写扫描器104和电源扫描器105。而且,像素101-(1,1)到101-(N,M)中在行方向上并置的其他像素101以相似的连接方式连接。
此外,像素101-(1,1)到101-(N,M)的第一列中的像素101-(1,1)到101-(1,M)通过图像信号线DTL10-1连接到水平选择器103。像素101-(1,1)到101-(N,M)的第N列中的像素101-(N,1)到101-(N,M)通过图像信号线DTL10-N连接到水平选择器103。而且,像素101-(1,1)到101-(N,M)中在列方向上并置的其他像素101以相似的连接方式连接。
写扫描器104在水平周期(1H)内向扫描线WSL10-1到WSL10-M提供顺次选择控制信号从而以行为单位逐行扫描像素101。电源扫描器105与逐行扫描同步地向电源线DSL10-1到DSL10-M提供图4中示出的第一电势Vcc或者第二电势Vss的电源电压。在每个水平周期(1H)内,水平选择器103与逐行扫描同步且可切换地向成列的图像信号线DTL10-1到DTL10-N提供图4中示出的相应于图像信号的信号电势Vsig和参考电势Vofs。
[像素101的阵列构造]
图2示出从EL面板100的像素101发射的光的颜色阵列。
应该注意的是,图2与图1的不同之处在于:扫描线WSL10和电源线DSL10示出为从下侧连接到像素101。像素101的连接有扫描线WSL10、电源线DSL10和图像信号线DTL10的侧可以根据布线线路布局而适当地改变。而且,水平选择器103、写扫描器104和电源扫描器105关于驱动像素阵列部分102的布置可以类似地适当改变。
像素阵列部分102的每个像素101发射红(R)、绿(G)和蓝(B)原色之一的光。颜色可以这样排列:例如,红、绿和蓝沿行方向而不是按列方向依次排列,相同的颜色出现在同列中。从而,像素101相应于所谓的子像素,且作为显示单位的一个像素由沿行方向(也就是,图2中的左右方向)并置的红、绿和蓝三个像素101形成。应该注意的是,EL面板100的颜色阵列不限于图2所示的特定阵列。
[像素101的详细电路构造]
图3示出包括在EL面板100中的N×M个像素101之一的像素电路的等效电路构造。
应该注意的是,如果图3中示出的像素101是像素101-(n,m)(n=1,2,...,N,m=1,2,...,M),则扫描线WSL10、图像信号线DTL10和电源线DSL10如以下所述。具体地,扫描线WSL10、图像信号线DTL10和电源线DSL10分别是相应于像素101-(n,m)的扫描线WSL10-m、图像信号线DTL10-n和电源线DSL10-m。
图3所示的像素101包括采样晶体管31、驱动晶体管32、存储电容器33、发光元件34和辅助电容器35。此外,图3中,发光元件34具有的电容成分示出为发光元件电容器34B。这里,存储电容器33、发光元件电容器34B和辅助电容器35分别具有电容值Cs、Coled和Csub。
采样晶体管31在其栅极处连接到扫描线WSL10、在其漏极处连接到图像信号线DTL10。此外,采样晶体管31在其源极处连接到驱动晶体管32的栅极。
驱动晶体管32在其源极和漏极之一处连接到发光元件34的阳极且在其源极和漏极中另一个处连接到电源线DSL10。存储电容器33连接在驱动晶体管32的栅极与发光元件34的阳极之间。此外,发光元件34在其阴极处连接到布线线路36,该布线线路36被设定为预定电势Vcat。电势Vcat是接地(GND)电平,从而,布线线路36是接地线。
提供辅助电容器35以补充发光元件34的电容成分(也就是,发光元件电容器34B)且与发光元件34并联。具体地,辅助电容器35在其电极之一处连接到发光元件34的阳极侧、在其另一个电极处连接到发光元件34的阴极侧。在辅助电容器35以这样的方式被提供且保持预定电势的情况下,驱动晶体管32的输入增益(input gain)可以提高。这里,驱动晶体管32的输入增益是在下面参考图4描述的写+迁移率修正周期T5内驱动晶体管32的源极电势Vs的增加量与驱动晶体管32的栅极电势Vg的增加量的比。
采样晶体管31和驱动晶体管32是N沟道晶体管。因此,采样晶体管31和驱动晶体管32可以由非晶硅形成,该非晶硅可以以低于低温多晶硅的成本被制造。因此,像素电路可以以降低的成本被制造。自然地,采样晶体管31和驱动晶体管32也可以由低温多晶硅或者单晶硅形成。
发光元件34由有机EL元件形成。有机EL元件是具有二极管特性的电流驱动发光元件。因此,发光元件34发光的等级(gradation)取决于施加的电流值Ids的光。
以如上所述的方式构造的像素101中,采样晶体管31响应于来自扫描线WSL 10的选择控制信号导通或者实施导电且对与通过图像信号线DTL10的等级相对应的信号电势Vsig的图像信号进行采样。存储电容器33存储且保持从水平选择器103通过图像信号线DTL 10提供给其的电荷。驱动晶体管32被提供来自具有第一电势Vcc的电源线DSL10的电流且响应于保持在存储电容器33中的信号电势Vsig向发光元件34提供驱动电流Ids。预定的驱动电流Ids流到发光元件34,且像素101发光。
像素101具有阈值修正功能。阈值修正功能是使存储电容器33保持与驱动晶体管32的阈值电压Vth相对应的电压的功能。在阈值修正功能发挥作用的情况下,驱动晶体管32的阈值电压Vth的影响(其是EL面板100的每个像素离散(dispersion)的原因)可以消除。
除了上述阈值修正功能之外,像素101还具有迁移率修正功能。迁移率修正功能是这样的功能:当在存储电容器33中保持信号电势Vsig时,施加对驱动晶体管32的迁移率μ的修正。
此外,像素101具有自举功能(bootstrap function)。自举功能是这样的功能:使驱动晶体管32的栅极电势Vg与驱动晶体管32的源极电势Vs互锁(interlock)。在自举功能发挥作用的情况下,驱动晶体管32的栅极与源极之间的电压Vgs可以保持固定。
[像素101的操作]
图4示出像素101的操作。
具体地,图4示出了扫描线WSL10、电源线DSL10和图像信号线DTL 10关于相同的时间轴的电压改变以及驱动晶体管32的栅极电势Vg和源极电势Vs的相应改变,其中图4中时间轴沿水平方向延伸。
参考图4,到时间t1的周期是发光周期T1,前述水平周期(1H)中的光发射在发光周期T1内连续。
从发光周期T1结束的时间t1到时间t2的周期是阈值修正准备周期T2,在阈值修正准备周期T2内驱动晶体管32的栅极电势Vg和源极电势Vs被初始化以为阈值修正操作做准备。
在阈值修正准备周期T2中,在时间t1处,电源扫描器105将电源线DSL的电势从为高电势的第一电势Vcc改变成是低电势的第二电势Vss。这里,发光元件34的阈值电压由Vthel表示。此时,如果第二电势Vss被设定为满足Vss<Vthel+Vcat,则因为驱动晶体管32的源极电势Vs变得基本上等于第二电势Vss,所以发光元件34被置于反向偏置状态而停止发光。
然后,在时间t2处,写扫描器104将扫描线WSL的电势改变为高电势以导通采样晶体管31。因此,驱动晶体管32的栅极电势Vg复位为参考电势Vofs,此外,源极电势Vs复位为图像信号线DTL的第二电势Vss。
此时,驱动晶体管32的栅-源电压Vgs变成Vofs-Vss。这里,如果Vofs-Vss不大于驱动晶体管32的阈值电压Vth,则接下来的阈值修正过程不能实施。因此,参考电势Vofs和第二电势Vss被设定为满足关系:Vofs-Vss>Vth。
从时间t3到时间t4的周期是阈值修正周期T3,在阈值修正周期T3内实施阈值修正操作。在阈值修正周期T3内,在时间t3处,电源线DSL的电势由电源扫描器105改变到第一电势Vcc,且与阈值电压Vth相对应的电压被写入连接在驱动晶体管32的栅极与源极之间的存储电容器33中。具体地,在阈值修正周期T3内,因为电源线DSL的电势改变到第一电势Vcc,驱动晶体管32的源极电势Vs上升而驱动晶体管32的栅-源电压Vgs在时间t4之前变成等于阈值电压Vth。
应该注意的是,因为电势Vcat被设定为使得发光元件34在阈值修正周期T3内被置于关断状态,所以驱动晶体管32的漏-源电流Ids流到存储电容器33侧,但是不流到发光元件34侧。
在从时间t4到时间t6的写+迁移率修正准备周期T4内,扫描线WSL的电势从高电势改变成低电势。此时,因为采样晶体管31截止,所以驱动晶体管32的栅极处于浮置状态。然而,因为驱动晶体管32的栅-源电压Vgs等于阈值电压Vth,所以驱动晶体管32处于截止状态。从而,漏-源电流Ids不流到驱动晶体管32。
然后,在时间t4之后、时间t6之前的时间t5处,水平选择器103将图像信号线DTL的电势从参考电势Vofs改变为与等级相对应的信号电势Vsig。
之后,在从时间t6到时间t7的写+迁移率修正周期T5内,图像信号的写入和迁移率修正操作同时进行。具体地,在从时间t6到时间t7的周期内,扫描线WSL的电势被设定为高电势。因此,与等级相对应的信号电势Vsig以增加到阈值电压Vth的形式写入存储电容器33。此外,从保持在存储电容器33中的电压减去用于迁移率修正的电压ΔV。
这里,在写+迁移率修正周期T5结束之后的时间t7处驱动晶体管32的栅-源电压Vgs为Vsig+Vth-ΔV。
在写+迁移率修正周期T5结束之后的时间t7处,扫描线WSL的电势变回到低电势。从而,驱动晶体管32的栅极从图像信号线DTL断开,因此被置于浮置状态。当驱动晶体管32的栅极处于浮置状态时,因为存储电容器33连接在驱动晶体管32的栅极与源极之间,所以驱动晶体管32的栅极电势Vg以与驱动晶体管32的源极电势Vs的改变互锁的关系改变。驱动晶体管32的栅极电势Vg以与驱动晶体管32的源极电势Vs的改变互锁的关系改变的操作是利用存储电容器33的自举操作。
在时间t7后,因为驱动晶体管32的栅极置于浮置状态且驱动晶体管32的漏-源电流Ids开始作为驱动电流流到发光元件34,所以发光元件34的阳极电势响应于驱动电流Ids上升。而且,驱动晶体管32的栅-源电压Vgs通过自举操作类似地增加。具体地,在驱动晶体管32的栅-源电压Vgs(其等于Vsig+Vth-ΔV)响应于图像信号线DTL的信号电势Vsig保持固定时,驱动晶体管32的栅极电势Vg和源极电势Vs增加。然后,当发光元件34的阳极电势超过Vthel+Vcat时,发光元件34开始发光。
在写+迁移率修正周期T5结束之后的时间点t7处,阈值电压Vth和迁移率μ的修正已经完成,因此,将从发光元件34发射的光的亮度不受驱动晶体管32的阈值电压Vth或迁移率μ的离散的影响。具体地,发光元件34在所有像素中以相等的光亮度响应于信号电势Vsig发光,而不受驱动晶体管32的阈值电压Vth或迁移率μ的离散的影响。
然后,在时间t7之后消逝预定的时间周期后的时间t8处,图像信号线DTL的电势从信号电势Vsig降到参考电势Vofs。
在EL面板100的每个像素101中,发光元件34可以以如上所述的方式被驱动为发光而不受驱动晶体管32的阈值电压Vth或迁移率μ的影响。从而,对于利用EL面板100的显示装置1,可以获得高质量的显示图像。
现在,在描述EL面板100的像素101的薄膜晶体管部分处的图案结构之前,描述迄今已知的薄膜晶体管部分的图案结构。
应该注意的是,如果EL面板100的像素101的薄膜晶体管部分处的图案结构与迄今已知的薄膜晶体管部分的图案结构相比较,则若干膜的位置不同。换言之,因为形成在基板上的膜的构造本身彼此不同,所以利用与EL面板100的像素101的图案结构相似的附图标记给出对图5和6中示出的迄今已知的薄膜晶体管部分的图案结构的描述。
[迄今已知的像素101的驱动晶体管32部分处的截面]
图5示出迄今已知的EL面板100X的像素101的驱动晶体管32部分处的截面。
参考图5,在EL面板100X中,驱动晶体管32的栅极电极72形成在由诸如玻璃的材料制成的支撑基板71上。作为形成沟道区域的半导体层的多晶硅膜74形成在栅极电极72的上侧,且绝缘膜73插设在二者之间。
源极电极75和漏极电极76形成在多晶硅膜74的上侧。源极电极75在其接触部分75a处连接到多晶硅膜74。漏极电极76在其接触部分76a处连接到多晶硅膜74。绝缘膜73插设在除了接触部分75a和76a之外的源极电极75与多晶硅膜74之间以及漏极电极76与多晶硅膜74之间。
平坦膜77层叠在源极电极75和漏极电极76上,为反射电极的阳极电极78形成在平坦膜77上。阳极电极78在其接触部分78a处连接到源极电极75。
未示出的有机EL膜形成在阳极电极78的上侧上,未示出的阴极电极形成在有机EL层上,其中有机EL膜是用于发射红色、绿色和蓝色之中的预定颜色的光的发光层。
[迄今已知的像素的问题]
在迄今已知的像素101中,作为阳极电极78与源极电极75之间的连接层的接触部分78a和作为源极电极75与多晶硅膜74之间的连接层的接触部分75a设置在在平面方向上彼此分离的位置处。这是因为,如果用于导电层彼此连接的倾斜部分(下文中被称为偏移部分)的距离是长的,则诸如台阶的接触故障出现的可能性会变大。台阶意味着这样的现象:形成在偏移部分处的膜变得薄使得引起图6中所示的断开。
层叠结构的膜作为用于阳极电极78的材料,其中例如,诸如ITO膜的透明导电膜层叠在铝(Al)或银(Ag)的薄膜的相对面上已将该薄膜夹在之间。尽管采用银的层叠结构膜具有这样的优点:在材料特性方面,其获得比铝更高的反射系数,但是很可能产生银薄膜的台阶或者透明导电膜的台阶。如果出现银薄膜或者透明导电膜的台阶或膜形成缺陷,则连接阻抗变高或者银被腐蚀,而导致不能实现良好的接触。
通常,为了防止这样的接触故障,接触部分78a和接触部分75a如图5所示设置在在平面方向上彼此分离的位置处。
然而,将接触部分78a和接触部分75a设置在在平面方向上彼此分离的位置处涉及大的布局面积且在旨在减小一个像素的面积的情况下其会成为阻碍。换言之,因为接触部分78a和接触部分75a在平面方向上彼此分离,所以存在这样的问题:难以实现EL面板的高清晰度。此外,在没有必要改变一个像素的面积的情况下,因为包括接触部分78a和接触部分75a的布局面积变大,所以不可避免地减小了其他组件的布局面积。在改善亮度或者节省驱动能量方面,其劣化了显示性能。
[迄今已知的像素101的顶平面图]
在下面的描述中,为了便于描述,在图5的截面图中定位在最下面上且形成栅极电极72的金属层被称为下面金属层。此外,形成多晶硅膜74的半导体层下文中被称为硅层,形成源极电极75和漏极电极76的金属层被称为中间金属层,形成阳极电极78的金属层被称为上面金属层。
参考图7,横过像素101的扫描线WSL10和电源线DSL10由中间金属层形成。此外,横过像素101的图像信号线DTL10,在其不与扫描线WSL10和电源线DSL10交叉的部分处由中间金属层形成,但是在其与扫描线WSL10和电源线DSL10交叉的部分处由下面金属层形成。
如果关注采样晶体管31,则采样晶体管31的漏极电极和源极电极由中间金属层形成,而采样晶体管31的栅极电极由下面金属层形成。此外,硅层形成在采样晶体管31的漏极电极和源极电极与栅极电极之间。硅层连接到作为采样晶体管31的漏极电极和源极电极的中间金属层。
如果关注驱动晶体管32,则驱动晶体管32的漏极电极和源极电极由中间金属层形成,而驱动晶体管32的栅极电极由下面金属层形成。此外,硅层形成在驱动晶体管32的漏极电极和源极电极与栅极电极之间。硅层连接到作为驱动晶体管32的漏极电极和源极电极的中间金属层。
形成驱动晶体管32的漏极电极的中间金属层通过接触部分76a连接到作为多晶硅膜74的硅层。形成驱动晶体管32的源极电极的中间金属层通过接触部分75a连接到作为多晶硅膜74的硅层。此外,形成驱动晶体管32的源极电极的中间金属层通过接触部分78a连接到阳极电极78。
存储晶体管33由以彼此相对的关系设置的下面金属层和硅层形成。存储晶体管33的电极中由下面金属层形成的一个电极通过中间金属层连接到采样晶体管31的源极电极。存储晶体管33的由硅层形成的另一电极连接到形成驱动晶体管32的源极电极的中间金属层。因为形成驱动晶体管32的源极电极的中间金属层如上所述连接到阳极电极78,结果,由硅层形成的存储电容器33的另一电极连接到阳极电极78。
而且,辅助电容器35由以彼此相对的关系设置的下面金属层和硅层形成。因为辅助电容器35的电极之一由与存储电容器33的另一电极共同的硅层形成,所以其连接到阳极电极78。辅助电容器35的另一电极通过接触部分79a连接到中间金属层,而中间金属层通过接触部分80a连接到阳极电极78。这里,通过接触部分80a电连接的接触部分78a的电势是电势Vcat。
迄今已知的EL面板100X的像素101以如上所述的方式被构造,且接触部分75a和接触部分78a以彼此间隔的关系定位。因此,形成驱动晶体管32的源极电极且具有两个接触部分75a和78a的中间金属层具有大的面积。
此外,因为接触部分79a和80a以彼此间隔的关系定位,所以具有接触部分79a和80a的中间金属层也具有大的面积。
从而,迄今已知的布置构造具有这样的问题:难以实现EL面板的高清晰度,或者招致诸如因改善亮度或者能量节省的驱动的功能上的劣化。
因此,描述在应用本发明的EL面板100中采用的像素101的第一实施例。
<第一实施例>
[EL面板100的像素101的驱动晶体管32部分处的截面]
图8示出第一实施例的像素101的驱动晶体管32部分处的截面。
参考图8,在示出的像素101中,作为阳极电极78与驱动晶体管32的源极电极75之间的连接部分的接触部分78b和作为源极电极75与多晶硅膜74之间的连接部分的接触部分75b在平面方向上设置在相同的位置处。换言之,接触部分78b和75b设置为使得从上面观察其中心位置彼此相同,也就是共轴。
因此,具有接触部分75b和78b的中间金属层的面积可以减小,且一个像素中的面积可以有效地被利用或者一个像素的面积可以减小。
然而,在图8的布置中,另一个偏移部分设置在一偏移部分上。更具体地,阳极电极78连接到一倾斜部分,在该倾斜部分处源极电极75连接到多晶硅膜74。因此,可以确认台阶容易出现。
<第二实施例>
因此,描述更好地抑制接触故障出现的EL面板100的像素101的第二实施例。
[EL面板100的像素101的驱动晶体管32部分处的截面]
图9示出第二实施例的像素101的驱动晶体管32部分处的截面。
在图9的像素101中,作为阳极电极78与驱动晶体管32的源极电极75之间的连接部分的接触部分78c和作为源极电极75与多晶硅膜74之间的连接部分的接触部分75c在平面方向上设置在相同的位置处。
此外,在图9的像素101中,形成接触部分75c的源极电极75的上侧上的膜面具有平坦面,且源极电极75和阳极电极78在平坦面上连接为接触部分78c。换言之,源极电极75和阳极电极78的面彼此接触。
此外,在形成接触部分78c的相同的平面上,源极电极75侧的平坦面的开口宽度L1大于阳极电极78的平坦面的开口宽度L2。
[接触部分78c的顶部平面图]
图10示出接触部分78c的顶部平面图。
如图10所示,接触部分78c可以形成为四边形形状或者圆形形状。在这种情况下,源极电极75侧的平坦面也具有与接触部分78c相同的形状,也就是,相同的四边形形状或者圆形形状。
同时,源极电极75侧的平坦面的开口宽度L1可以形成为比阳极电极78的平坦面的开口宽度L2大,例如大1μm。
在源极电极75的上侧膜面提供有平坦面,且阳极电极78和源极电极75如上所述在平坦面上彼此连接,确保了与图5中所示的在已知的接触部分78a处相似的连接面。从而,可以防止接触故障。
[EL面板100的顶部平面图]
图11示出第二实施例的EL面板100的顶部平面图。应该注意的是,在图11的示例中,接触部分75c和78c形成为四边形形状。
参考图11,接触部分75c和78c设置在驱动晶体管32的图面(the plan ofthe figure)的下侧位置处的一个地点处。从而,在图11中的示例与图7的示例相比较的情况下,具有接触部分75c和78c的中间金属层具有减小的面积。
分别与图7中所示的接触部分79a和80a相对应的接触部分79c和80c相似地在平面方向上设置在相同的位置处。因此,它们的中间金属层具有减小的面积。
因为具有接触部分75c和78c的中间金属层和具有接触部分79c和80c的中间金属层分别具有减小的面积,所以与图7相比,图11中的辅助电容器35的面积可以减小。
如上所述,对于EL面板100,硅层或者第一导电层与中间金属层或第二导电层之间的接触部分75c以及中间金属层与上面金属层或者第三导电层之间的接触部分78c在平面方向上设置在相同的位置处。从而,具有两个接触部分(也就是,接触部分75c和78c)的中间层的面积可以减小,且一个像素的面积也可以减小。另一方面,在没有必要改变一个像素的面积的情况下,可以改善显示性能。
此外,对于EL面板100,硅层或者第一导电层与中间金属层或第二导电层之间的接触部分75c具有平坦面,且中间层与上面金属层或者第三导电层之间的接触部分78c设置在平坦面上。从而,不仅在阳极电极78的材料是铝(Al)的情况下而且在采用利用银的层叠结构的膜的情况下,都可以防止诸如台阶的接触故障。
本发明的实施例不限于以上所述的特定实施例,而是可以以各种方式被修改而不脱离本发明的主题。
尽管像素101由诸如采样晶体管31和驱动晶体管32的两个晶体管以及诸如存储电容器33和辅助电容器35的两个电容器来构造,但也可以采用不同的电路构造。
例如,因为提供辅助电容器35是为了补充发光元件34的电容成分,所以其可以被省略。从而,像素101可以由两个晶体管以及诸如存储电容器33的单个电容器来构造,也就是,构造为2Tr/1C像素电路。
此外,作为像素101的不同的电路构造,例如,可以采用以下的电路构造。具体地,可以采用这样的构造:除了2Tr/1C像素电路之外还包括第一到第三晶体管,也就是,五个晶体管和一个电容器。刚刚描述的构造下文被称为5Tr/1C像素电路。在像素101采用5Tr/1C像素电路的情况下,将从水平选择器103通过图像信号线DTL10提供到采样晶体管31的信号电势固定为信号电势Vsig。结果,采样晶体管31仅起对信号电势Vsig到驱动晶体管32的提供的开关作用。此外,将通过电源线DSL10提供到驱动晶体管32的电势固定为第一电势Vcc。此外,新增加的第一晶体管开关第一电势Vcc到驱动晶体管32的提供。第二晶体管开关第二电势Vss到驱动晶体管32的提供。此外,第三晶体管开关参考电势Vofs到驱动晶体管32的提供。
此外,作为像素101的另一个不同的电路构造,可以采用2Tr/1C像素电路和5Tr/1C像素电路之间的中间构造。具体地,可以采用这样的构造,其包括四个晶体管和一个电容器,也就是,4Tr/1C像素电路,或者采用这样的构造,其包括三个晶体管和一个电容器,也就是,3Tr/1C像素电路。4Tr/1C像素电路可以构造为例如,5Tr/1C像素电路的第三晶体管被省略且将从水平选择器103提供到采样晶体管31的信号电势利用信号电势Vsig和参考电势Vofs形成为脉冲信号。
与2Tr/1C像素电路相似,3Tr/1C像素电路、4Tr/1C像素电路和5Tr/1C像素电路可以附加地包括辅助电容器35。
本发明包括与于2009年4月13日提交到日本专利局的日本优先权专利申请JP2009-097083中公开的相关的主题,将其全部内容引用参考于此。
本领域的技术人员应该理解的是,各种修改、结合、部分结合和改变可以根据设计需要和其他因素而发生,只要它们落在所附权利要求或其等同特征的范围内。

Claims (6)

1.一种显示装置,包括:
面板,具有设置成矩阵的多个像素,每个像素包括用于发光的自发光元件,
所述面板包括依次层叠在支撑基板上的第一到第三导电层,
所述第一导电层与所述第二导电层之间的第一接触部分以及所述第二导电层与所述第三导电层之间的第二接触部分在平面方向上设置在相同的位置处。
2.根据权利要求1所述的显示装置,其中所述第一接触部分具有平坦面,所述第二接触部分设置在所述平坦面上。
3.根据权利要求1所述的显示装置,其中所述第一接触部分的开口宽度大于所述第二接触部分的开口宽度。
4.根据权利要求1所述的显示装置,其中所述像素的每个包括:
发光元件,具有二极管特性且用于响应于驱动电流而发光;
采样晶体管,用于对图像信号进行采样;
驱动晶体管,用于提供所述驱动电流到所述发光元件;以及
存储电容器,连接到所述发光元件的阳极侧及所述驱动晶体管的栅极且用于保持预定的电势。
5.根据权利要求1所述的显示装置,其中所述第一导电层是半导体层,所述第二导电层是形成所述驱动晶体管的源极电极和漏极电极的金属层,而所述第三导电层是形成所述发光元件的阳极电极的金属层。
6.根据权利要求1所述的显示装置,其中所述第三导电层由含银的材料制成。
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