CN101286523B - 平板显示器 - Google Patents

平板显示器 Download PDF

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CN101286523B
CN101286523B CN200810003981XA CN200810003981A CN101286523B CN 101286523 B CN101286523 B CN 101286523B CN 200810003981X A CN200810003981X A CN 200810003981XA CN 200810003981 A CN200810003981 A CN 200810003981A CN 101286523 B CN101286523 B CN 101286523B
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pixel
driving circuit
pixel electrode
flat
panel monitor
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CN101286523A (zh
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徐美淑
姜泰旭
李乙浩
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Samsung Display Co Ltd
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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
    • H10K59/131Interconnections, 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
    • 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
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    • 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
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    • H10K59/35Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
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    • 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
    • G09G2300/0439Pixel structures
    • G09G2300/0452Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
    • 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
    • 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
    • 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
    • G09G2320/0223Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
    • 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
    • G09G2320/0233Improving the luminance or brightness uniformity across the screen
    • 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
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    • H10K2102/00Constructional details relating to the organic devices covered by this subclass
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    • H10K2102/302Details of OLEDs of OLED structures
    • H10K2102/3023Direction of light emission
    • H10K2102/3026Top emission

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Abstract

本发明提供了一种平板显示器,这种平板显示器具有优良的对三原色的颜色混合以获得不同的色彩,并且只有很少的信号延迟。该显示器包括信号线,信号线包括扫描线和与扫描线相交叉的数据线,扫描线和数据线都沿直线延伸。红、绿、蓝像素驱动电路区域由扫描线和数据线的交叉来限定。具有相同颜色的像素驱动电路区域沿列方向相邻地排列。红、绿、蓝像素驱动电路位于像素驱动电路区域中并且结合到红、绿、蓝像素电极。像素电极沿行和列的方向邻近于不同颜色的像素电极。相同颜色的像素电极沿列方向交替地位于与相同颜色对应的列的像素驱动电路的第一侧和第二侧。

Description

平板显示器
本申请是申请日为2005年11月7日、申请号为200510115604.1、发明名称为“平板显示器”的专利申请的分案申请。
技术领域
本发明涉及一种平板显示器,更具体地说,涉及一种全彩色平板显示器。
背景技术
因为平板显示器重量轻、结构薄、图像质量更好,所以其被认为是阴极射线管显示器的替代品。平板显示器的示例包括液晶显示器(LCD)和有机发光显示器(OLED)。与LCD相比,OLED具有更高的亮度和更大的视角,并且不需要背光,这使得OLED在实现薄显示器中具有优势。
平板显示器包括用于实现全彩色显示的红、绿、蓝像素。红、绿、和蓝像素可形成在以条状排列、马赛克(mosaic)状排列、或“Δ”(delta)状排列的阵列中。“Δ”状排列和马赛克状排列在混合三原色的颜色以获得不同的色彩方面都优于条状排列,因而,“Δ”状排列和马赛克状排列更适合显示运动的画面。在第6,429,599号美国专利中已经公开了具有按“Δ”状排列的像素阵列的OLED。
图1是上述美国专利中公开的具有按“Δ”状排列的像素阵列的OLED的平面图。在这个图中,红(R)、绿(G)、蓝(B)像素按“Δ”状排列。在以条状排列的阵列中,相邻行的像素成直线,从而所有的R像素沿相同的列,所有的G像素沿相同的列,所有的B像素沿相同的列。另一方面,在“Δ”状排列中,相邻行的像素是交错的,从而一行的B像素与该行的相邻两行的R像素及G像素形成三角形,或“Δ”状。每个R像素、G像素、及B像素包括第一薄膜晶体管(TFT)4、电容器5、第二TFT 6、和发光二极管的像素电极7。此外,数据线1和栅极线3结合到第一TFT 4,电源线2结合到第二TFT6。
如上所述,在“Δ”状排列中,一行的每个R像素、G像素、及B像素邻近于相邻行的其它两个颜色像素设置,从而从一个像素到相邻列中的相同颜色的像素产生Z字路径。在总体列方向上延伸的数据线1沿这个Z字路径结合到相同颜色像素的第一TFT 4。Z字路径增大了数据线1的电阻,延迟了数据信号。而且,电源线2也沿Z字路径延伸。因而,电源线2的电阻也被增大了,这会导致电压沿电源线下降。数据信号沿数据线1的延迟和电压沿电源线2下降会恶化画面质量,这随着显示尺寸的增加作为一个严重的问题显现出来。此外,如此复杂的互连布局增加了互连所占据的空间,这导致孔径比的减小。
发明内容
本发明通过提供一种平板显示器来解决传统装置的问题,该平板显示器具有改善的三原色颜色混合以获得不同的色彩,并且没有信号延迟或电压下降。
在本发明的示例性实施例中,平板显示器包括:衬底;排列在衬底上的信号线,包括扫描线和与扫描线相交叉的数据线,扫描线和数据线沿直线延伸;像素驱动电路区域,由扫描线和数据线的交叉来限定;像素驱动电路,位于像素驱动电路区域中;像素电极,结合到像素驱动电路,,像素电极沿行和列的方向邻近于不同颜色的像素电极,其中,相同颜色的像素驱动电路区域沿列方向相邻地排列,相同颜色的像素电极沿所述列方向交替地位于与相同颜色对应的列的像素驱动电路的第一侧和第二侧。
在本发明的又一示例性实施例中,平板显示器包括:衬底;排列在衬底上的信号线,包括扫描线和与扫描线交叉的数据线,数据线和扫描线沿直线延伸;红、绿、蓝像素驱动电路区域,由扫描线和数据线的交叉限定,在像素驱动电路区域中相同颜色的像素驱动电路区域沿列方向相邻地排列;红、绿、蓝像素驱动电路,分别位于红、绿、蓝像素驱动电路区域中;红、绿、蓝像素电极,分别结合到红、绿、蓝像素驱动电路,红、绿、蓝像素电极沿行和列的方向邻近于不同颜色的像素电极,其中,相同颜色的像素电极沿所述列方向交替地位于与所述相同颜色对应的列的像素驱动电路的第一侧和第二侧。
附图说明
图1是具有以“Δ”状排列的像素阵列的传统OLED的平面图。
图2是在根据本发明第一实施例的OLED中的像素驱动电路的电路图。
图3是根据本发明第一实施例的OLED的像素阵列的平面图。
图4A和图4B是根据本发明第一实施例的OLED沿图3中的线I-I’截取的剖面图。
图5是在根据本发明第二实施例的OLED中的像素驱动电路的电路图。
图6是在根据本发明第三实施例的OLED中的像素驱动电路的电路图。
具体实施方式
在下面的附图描述中,在不同层上或在衬底上形成层表示该层直接形成在所述不同层上或直接形成在衬底上。然而,它也可以表示在所形成的层和所述不同层或衬底之间存在其它层。
图2是在根据本发明第一实施例的OLED中的像素驱动电路100a的电路图。每个像素驱动电路100a结合到信号线,信号线包括扫描线S,数据线DR、DG、DB,和电源线ELVDD。数据线DR、DG、DB包括红数据线DR、绿数据线DG、和蓝数据线DB。红、绿、蓝数据线DR、DG、DB与扫描线S相交叉,从而限定红像素PR、绿像素PG、和蓝像素PB。红、绿、蓝数据线DR、DG、DB分别结合到红像素PR、绿像素PG、和蓝像素PB。因而,具有特定颜色(红、绿、蓝)的数据信号被传送到对应于相同颜色的数据线DR、DG、DB。像素驱动电路100a比对应于不同颜色的数据信号被相同的数据线传送的电路更容易被驱动。
像素包括红、绿、蓝发光二极管ER、EG、EB和用于驱动发光二极管ER、EG、EB的像素驱动电路100a。像素驱动电路100a具有开关晶体管M1a、电容器Csta、和驱动晶体管M2a。开关晶体管M1a具有结合到扫描线S的栅极和结合到数据线DR、DG、DB的源极,从而基于施加到扫描线S的扫描信号来开关施加到数据线DR、DG、DB的数据信号。电容器Csta结合在开关晶体管M1a的漏极和电源线ELVDD之间以将数据信号存储预定长度时间。驱动晶体管M2a具有结合到电容器Csta的栅极、结合到电源线ELVDD的源极、和结合到每个发光二极管ER、EG、EB的漏极,从而将相应于数据信号的电流供应到每个发光二极管ER、EG、EB。每个发光二极管ER、EG、EB相应于所供应的电流发光。
图3是根据本发明第一实施例的OLED的像素阵列200a的平面图,其中相同的标号表示和图2中相同的元件。信号线包括排列在衬底上的扫描线S,数据线DR、DG、DB,和电源线ELVDD。每个扫描线S沿第一方向延伸。数据线DR、DG、DB包括红数据线DR、绿数据线DG、和蓝数据线DB。每个数据线DR、DG、DB沿与第一方向交叉的第二方向延伸。当扫描线S和数据线DR、DG、DB沿相交叉的方向延伸时,它们是彼此绝缘的。电源线ELVDD当与扫描线S交叉时也是绝缘的。电源线ELVDD的排列方向与数据线DR、DG、DB的排列方向相同。
像素驱动电路区域CR、CG、CB由信号线限定,具体地讲,像素驱动电路区域CR、CG、CB由彼此交叉的扫描线S和数据线DR、DG、DB限定。在这个实施例中,像素驱动电路区域CR、CG、CB指设置用于控制施加到发光二极管ER、EG、EB的信号的像素驱动电路100a的区域。因而,像素驱动电路区域CR、CG、CB是放置图2中示出的像素驱动电路100a的所有元件的区域。发光二极管ER、EG、EB没有位于像素驱动电路区域CR、CG、CB上。
在像素驱动电路区域CR、CG、CB中,具有相同颜色的区域沿列方向相邻地排列。例如,红像素驱动电路区域CR沿相同的列摆放。换言之,像素驱动电路区域CR、CG、CB具有带状排列。因而,顺次结合到相应颜色的像素的数据线DR、DG、DB也可沿直线排列。这与图1的z字线形成了对比。在图3所示的构造中,缩短了每个数据线DR、DG、DB的长度,减小了数据线电阻,从而防止施加到每个数据线DR、DG、DB的数据信号被延迟。电源线ELVDD也可沿直线排列。从而,也减小了电源线ELVDD的线电阻并防止供应到电源线ELVDD的电压的降低。因此,改善了画面质量。此外,减小了被数据线DR、DG、DB和电源线ELVDD占据的区域,因而提高了孔径比。
红、绿、蓝像素驱动电路100a分别位于红、绿、蓝像素驱动电路区域CR,CG,CB上。每个像素驱动电路100a包括开关晶体管M1a、电容器Csta、和驱动晶体管M2a。红、绿、蓝像素驱动电路100a分别结合到红、绿、蓝像素电极140R、140G、140B。更详细地讲,驱动晶体管M2a的漏电极130a结合到每个像素电极140R、140G、140B。在每个像素电极140R、140G、140B中的开口定义为发光区,其中,开口指图4B中的145a。有机发射层和相对电极被顺次位于每个像素电极140R、140G、140B的开口上方。像素电极140R、140G、140B,有机发射层,和相对电极组成发光二极管ER、EG、EB
像素电极140R、140G、140B的排列与像素驱动电路区域CR、CG、CB的排列不同。每个像素电极140R、140G、140B沿行和列方向邻近于不同颜色的像素电极排列。例如,红像素电极140R沿行和列方向邻近于绿像素电极140G和蓝像素电极140B排列,而不邻近于另一红像素电极140R排列。为了说明的目的,如果我们假设图3中的中间行是奇数行,那么在奇数行中的像素电极140R、140G、140B位于像素驱动电路区域CR、CG、CB的右边,在偶数行中的像素电极140R、140G、140B位于像素驱动电路区域CR、CG、CB的左边。这导致图3中的像素电极140R、140G、140B的“Δ”状排列。“Δ”状排列改善了三原色的颜色混合以获得不同的色彩,提升了画面质量。因此,当信号线沿直线延伸时,像素电极140R、140G、140B可以以“Δ”状排列摆放,“Δ”状排列实现有效的颜色混合。像素驱动电路区域CR,CG,CB沿行方向的长度与一节距相对应。在一个实施例中,考虑到颜色混合,像素电极140R、140G、140B以0.5节距到1.5节距位于像素驱动电路区域CR、CG、CB的左边或右边。优选0.75节距。像素电极140R、140G、140B与信号线至少叠置一部分。
如上所述,具有相同颜色的像素驱动电路区域CR、CG、CB沿列方向相邻地设置,同时像素电极140R、140G、140B沿行方向和列方向邻近于不同颜色的像素电极设置,从而没有信号延迟地实现三原色的颜色混合以获得不同的色彩,因而改善了画面质量。
图4A和图4B是根据本发明第一实施例的OLED沿图3中的线I-I’截取的剖面图。
图4A示出具有红像素驱动电路区域CR、绿像素驱动电路区域CG、蓝像素驱动电路区域CB的衬底100。衬底100可以是透明的衬底或者不透明的衬底。此外,衬底100可以是玻璃衬底、塑料衬底、石英衬底、硅衬底、或金属衬底。可在衬底100上形成缓冲层105。缓冲层105可包括硅氧化物层、硅氮化物层、硅氧氮化物层、或上述材料的多层化合物。
半导体层110形成在缓冲层105上。半导体层110可包括非晶硅层或从非晶硅层结晶的多晶硅层。在一个实施例中,半导体层110包括具有高迁移率的多晶硅层。栅绝缘层115形成在半导体层110上。栅绝缘层115包括硅氧化物层、硅氮化物层、硅氧氮化物层、或上述材料的多层化合物。
栅电极120形成在栅绝缘层115上,并且形成栅电极120的区域正是半导体层110位于栅绝缘层115下面的区域。在形成栅电极120的同时,也可形成扫描线S(参见图3)。然后,通过利用栅电极120作为掩膜将导电杂质注入半导体层110来形成源区110c和漏区110a。沟道区110b限定在源区110c和漏区110a之间。第一内绝缘层125形成在栅电极120和半导体层110上。另外,穿过第一内绝缘层125形成接触孔以露出源区110c和漏区110a。导电层被沉积在具有接触孔的衬底上,然后构图以形成源电极130c、漏电极130a、数据线DR、DG、DB,和电源线ELVDD。源电极130c和漏电极130a分别与露出的源区110c和漏区110a接触。因此,通过半导体层110、栅电极120、源电极130c和漏电极130a形成了驱动晶体管M2a(参见图3)。
第二内绝缘层133、135形成在具有源电极130c、漏电极130a的衬底上。第二内绝缘层133、135可以是钝化层133、平坦化层135、或平坦化层135沉积在钝化层133上的双层。钝化层133可由硅氧化物层、硅氮化物层、硅氧氮化物层、或包括上述化合物的组合的多层形成。在一个实施例中,钝化层133包括硅氮化物层,该硅氮化物层能够有效地保护下面的薄膜晶体管不受气体和潮湿的侵损,并含有大量的氢,氢用来钝化多晶硅层的晶粒边界处的不完全的键。平坦化层135是诸如苯并环丁烯(benzocyclobutene)(BCB)层、聚酰亚胺层、聚丙烯酸层的有机层,其用于为下面的表面提供光滑的覆盖物。穿过第二内绝缘层133、135形成通孔135a以露出漏电极130a。
参见图4B,像素电极140R、140G、140B每个具有一个通孔135a地形成在衬底上。在示出的实施例中,像素电极140R、140G、140B形成在第二内绝缘层133、135上。像素电极140R、140G、140B结合到通过通孔135a露出的漏电极130a。
如上所述,像素电极140R、140G、140B的排列与像素驱动电路区域CR、CG、CB的排列不同。更详细地说,像素电极140R、140G、140B排列在像素驱动电路区域CR、CG、CB的左边。像素电极140R、140G、140B结合到像素驱动电路区域CR、CG、CB的漏电极130a。每个像素电极140R、140G、140B形成在至少一些信号线,例如数据线DR、DG、DB,和电源线ELVDD,之上。在一个实施例中,形成于像素电极140R、140G、140B和数据线DR、DG、DB之间的第二内绝缘层133、135的厚度T1或者形成于像素电极140R、140G、140B和电源线ELVDD之间的第二内绝缘层133、135的厚度T2可以是
Figure GSB00000109940500062
或更大。由于具有相对大的隔离,故可使像素电极140R、140G、140B与数据线DR、DG、DB之间的寄生电容和像素电极140R、140G、140B与电源线ELVDD之间的寄生电容最小化。优选地,考虑到通孔135a的深宽比,这些厚度T1、T2,即第二内绝缘层133、135的厚度可以为
Figure GSB00000109940500071
到3μm
Figure GSB00000109940500072
像素电极140R、140G、140B由反射导电层制成,反射导电层可包括具有高功函数的Ag、Al、Ni、Pt、Pd,或这些元素的合金。在这种情况下,像素电极140R、140G、140B用作阳极。此外,反射导电层可包括具有低功函数的Mg、Ca、Al、Ag、Ba或这些元素的合金。在这种情况下,像素电极140R、140G、140B用作阴极。
另一方面,反射层图案139可在形成像素电极140R、140G、140B之前另外形成在像素电极140R、140G、140B的下面。在这种情况下,像素电极140R、140G、140B必须由透明导电层制成。透明导电层包括氧化铟锡(ITO)层或氧化铟锌(IZO)层。在一个实施例中,反射层图案139可具有60%或更大的反射率。此外,反射层图案139包括Al、铝合金、Ag、银合金、或含有这些金属和合金的任一组合物的合金。反射层图案139可和通孔135a分隔开。
像素限定层145形成在像素电极140R、140G、140B上。像素限定层145可由苯并环丁烯(benzocyclobutene)(BCB)、以丙烯酸为基础的光阻材料(acrylic-based photoresist)、以苯酚为基础的光阻材料(phenolic-basedphotoresist)、或以酰亚胺为基础的光阻材料(imide-based photoresist)形成。开口145a形成在像素限定层145中以至少露出一部分像素电极140R、140G、140B。
发红光层150R、发绿光层150G、发蓝光层150B形成在通过开口145a露出的红、绿、蓝像素电极140R、140G、140B上。可通过真空沉积法、喷墨印刷法、和激光诱导热成像法来形成每个发光层。另外,空穴注入层、空穴传输层、空穴阻挡层、电子传输层、或电子注入层(未示出)可形成在发光层150R、150G、150B的上或下。然后,相对电极160形成在发光层150R、150G、150B上。相对电极160可形成在整个衬底上。相对电极160可由透明导电层形成。透明导电层可以是ITO层或IZO层,或者可包括从Mg、Ca、Al、Ag、Ba这一组元素选出的元素或这些元素的任一合金,这种元素或合金层足够薄,以使光透射。
像素电极140R、140G、140B,发光层150R、150G、150B,和相对电极160分别形成发光二极管ER、EG、EB。发光二极管ER、EG、EB的发光区ERR、ERG、ERB由开口145a限定。
当驱动发光二极管ER、EG、EB工作时,空穴和电子被从像素电极和相对电极注入到发光层150R、150G、150B中。然后,注入到发光层150R、150G、150B中的电子和空穴在发光层150R、150G、150B中复合,从而产生激子。当激子从激发态跃迁到基态时,发射光。从发光层150R、150G、150B发射的光由像素电极140R、140G、140B反射(在这种情况下,像素电极140R、140G、140B由反射导电层制成),或者由像素电极140R、140G、140B下面的反射层图案139反射(在这种情况下,像素电极140R、140G、140B由透明导电层制成),然后通过由透明导电层制成的相对电极160发射到外部。
图5是在根据本发明第二实施例的OLED中的像素驱动电路100b的电路图。第(n-1)扫描线S(n-1)、第(n)扫描线S(n)、数据线D、电源线ELVDD、和预充电线Vint结合到像素驱动电路100b。像素P由相交叉的数据线D和扫描线S(n)限定。像素P包括发光二极管E和用于驱动发光二极管E的像素驱动电路100b,其中发光二极管E可以是红、绿、蓝发光二极管ER、EG、EB中的任一个。取决于发光二极管ER、EG、EB和数据线D,像素P可以是红、绿、或蓝像素PR、PG、PB,其中数据线D可以是红、绿、或蓝数据线DR、DG、DB。像素驱动电路由第一到第四晶体管M1b、M2b、M3b、M4b和电容器Cstb组成。
第一晶体管M1b包括结合到扫描线S(n)的栅和结合到数据线D的源。第三晶体管M3b包括结合到第一晶体管M1b的漏的源和彼此相结合的栅和漏。第四晶体管M4b包括结合到第(n-1)扫描线S(n-1)的栅、结合到第三晶体管M3b的漏的源、和结合到预充电线Vint的漏。第二晶体管M2b包括结合到第三晶体管M3b的栅的栅、结合到电源线ELVDD的源、和结合到发光二极管E的漏。电容器Cstb结合在第三晶体管M3b的栅和电源线ELVDD之间。可以是红、绿、蓝发光二极管ER、EG、EB中的任一个的发光二极管E包括像素电极、相对电极、和置于像素电极与相对电极之间的发光层。发光二极管E的像素电极、相对电极、和发光层与用于第一实施例100a的发光二极管ER、EG、EB的在图4B中示出的像素电极140R、140G、140B,相对电极160,和发光层150R、150G、150B相似。
具有上述根据本发明第二实施例的像素驱动电路100b的OLED的像素布局与图3中为第一实施例100a所示的像素布局相似。但是,在第二实施例的像素驱动电路100b中,在行或列方向上增加了预充电线Vint,并且也增加了第三晶体管M3b和第四晶体管M4b。第二实施例100b的第一到第四晶体管M1b、M2b、M3b、M4b和电容器Cstb位于像素驱动电路区域中,该像素驱动电路区域与图3中示出的第一实施例的像素驱动电路区域CR、CG、CB相似。像素电极(与第一实施例的像素电极140R、140G、140B相似)可与预充电线Vint叠置。
图6是在根据本发明第三实施例的OLED中的像素驱动电路100c的电路图。包括扫描线S(n)、数据线D、电源线ELVDD、和发光控制线EM(n)的信号线结合到像素驱动电路100c。数据线D和扫描线S(n)彼此交叉,限定像素P。像素P包括可以是红、绿、蓝发光二极管ER、EG、EB中的任一个的发光二极管E和用于驱动发光二极管E的像素驱动电路100c。像素驱动电路100c包括第一到第三晶体管M1c、M2c、M3c和电容器Cstc。
第一晶体管M1c包括结合到扫描线S的栅和结合到数据线D的源。第二晶体管M2c包括结合到第一晶体管M1c的漏的栅和结合到电源线ELVDD的源。电容器Cstc结合在第二晶体管M2c的栅和电源线ELVDD之间。第三晶体管M3c包括结合到发光控制线EM(n)的栅、结合到第二晶体管M2c的漏的源、和结合到发光二极管E的漏。发光二极管E包括像素电极、相对电极、和置于像素电极与相对电极之间的发光层。发光二极管E的像素电极、相对电极、和发光层与用于第一实施例100a的发光二极管ER、EG、EB的在图4B中示出的像素电极140R、140G、140B,相对电极160,和发光层150R、150G、150B相似。
除了在行或列方向上加入发光控制线EM(n),具有上述根据本发明第三实施例的像素驱动电路100c的OLED的像素布局与图3中示出的像素布局相同,第一到第三晶体管M1c、M2c、M3c和电容器Cstc位于像素驱动电路区域(与图3中示出的第一实施例的像素驱动电路区域CR、CG、CB相似)中。像素电极(与第一实施例的像素电极140R、140G、140B相似)可与发光控制线EM(n)叠置。
在该说明书中,OLED的实施例是通过举例的方式来描述的。本发明也可应用于LCD,特别是利用外部光的反射型LCD。
如上所述,具有相同颜色的像素驱动电路区域CR、CG、CB沿列方向相邻地排列,并且每个像素电极140R、140G、140B沿行方向和列方向邻近于具有不同颜色的像素电极140R、140G、140B排列,这种排列没有信号延迟地或没有电压下降地实现三原色的颜色混合以获得不同的色彩,并实现优良的画面质量。
虽然已参照某些示例性实施例描述了本发明,但是本领域技术人员应该理解,在不脱离由权利要求及其等同物所限定的本发明的精神或范围的情况下,可对本发明作出各种修改和变化。

Claims (10)

1.一种平板显示器,包括:
衬底;
信号线,排列在所述衬底上,所述信号线包括扫描线和与所述扫描线相交叉的数据线,所述扫描线和所述数据线沿直线延伸;
像素驱动电路区域,由所述扫描线和所述数据线的交叉来限定;
像素驱动电路,位于所述像素驱动电路区域中;和
像素电极,结合到所述像素驱动电路,所述像素电极沿行和列的方向邻近于不同颜色的像素电极,
其中,相同颜色的像素驱动电路区域沿列方向相邻地排列,
其中,相同颜色的像素电极沿所述列方向交替地位于与相同颜色对应的列的像素驱动电路的第一侧和第二侧。
2.如权利要求1所述的平板显示器,其中,所述信号线包括与所述扫描线相交叉并沿直线延伸的电源线。
3.如权利要求1所述的平板显示器,其中,所述像素电极由透明导电层形成,并且所述平板显示器还包括形成于所述透明导电层下面的反射层图案。
4.如权利要求1所述的平板显示器,其中,所述像素电极按“△”状排列。
5.如权利要求1所述的平板显示器,其中,所述平板显示器是有机发光显示器。
6.一种平板显示器,包括:
衬底;
信号线,排列在所述衬底上,所述信号线包括扫描线和与所述扫描线相交叉的数据线,所述扫描线和所述数据线沿直线延伸;
红、绿、蓝像素驱动电路区域,由所述扫描线和所述数据线的交叉来限定,在所述像素驱动电路区域中相同颜色的像素驱动电路区域沿列方向相邻地排列;
红、绿、蓝像素驱动电路,分别位于所述红、绿、蓝像素驱动电路区域中;和
红、绿、蓝像素电极,分别结合到所述红、绿、蓝像素驱动电路,所述红、绿、蓝像素电极沿行和列的方向邻近于不同颜色的像素电极,
其中,相同颜色的像素电极沿所述列方向交替地位于与所述相同颜色对应的列的像素驱动电路的第一侧和第二侧。
7.如权利要求6所述的平板显示器,其中,所述像素电极按“△”状排列。
8.如权利要求6所述的平板显示器,其中,所述平板显示器是有机发光显示器。
9.如权利要求6所述的平板显示器,其中,所述像素电极由反射导电层形成。
10.如权利要求6所述的平板显示器,其中,所述像素电极由透明导电层形成,并且所述平板显示器还包括形成于所述透明导电层下面的反射层图案。
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