CN110706650A - 像素驱动电路 - Google Patents

像素驱动电路 Download PDF

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CN110706650A
CN110706650A CN201910878206.7A CN201910878206A CN110706650A CN 110706650 A CN110706650 A CN 110706650A CN 201910878206 A CN201910878206 A CN 201910878206A CN 110706650 A CN110706650 A CN 110706650A
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thin film
film transistor
switch
driving circuit
pixel driving
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赵隋鑫
韩佰祥
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Priority to CN201910878206.7A priority Critical patent/CN110706650A/zh
Priority to PCT/CN2019/113028 priority patent/WO2021051475A1/zh
Priority to US16/624,917 priority patent/US20210280134A1/en
Publication of CN110706650A publication Critical patent/CN110706650A/zh
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    • 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
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    • 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
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    • 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
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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    • 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
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    • G09G2300/00—Aspects of the constitution of display devices
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    • G09G2300/00—Aspects of the constitution of display devices
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    • G09G2300/0852—Several 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active 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
    • G09G2300/0876—Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • 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
    • G09G2320/0219—Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling
    • G—PHYSICS
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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

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Abstract

一种像素驱动电路，包括驱动薄膜晶体管；稳压电容，所述稳压电容的第一端连接于所述驱动薄膜晶体管的控制端，所述稳压电容的第二端连接于所述驱动薄膜晶体管的第一端；第一电容，所述第一电容的第一端连接于所述驱动薄膜晶体管的所述控制端，所述第一电容的第二端连接于所述驱动薄膜晶体管的第二端；以及发光器件，所述发光器件的第一端连接于所述驱动薄膜晶体管的所述第二端，所述发光器件的第二端接地。所述像素驱动电路在驱动薄膜晶体管的栅极增加稳压电容，能够降低穿通效应造成的电压损失，提高面板的显示均匀性。

Description

像素驱动电路
技术领域
本发明涉及显示技术领域，尤其涉及一种像素驱动电路。
背景技术
OLED(organic light-emitting diode,有机发光二极管)显示面板与LCD(Liquidcrystal display,液晶显示器)相比具有自发光的独特优势，且具有能耗小、对比度高、色域广以及可折叠等具有竞争力的优点，已经成为目前的主流显示面板。
但是，现有的像素驱动电路在完成充电过程后，栅极薄膜晶体管关闭时，电压的迅速变化会造成严重的穿通(feedthrough)效应，导致面板显示均匀性下降，并且对低灰阶下的均匀性影响更为突出。
发明内容
本发明提供一种像素驱动电路，以解决现有的像素驱动电路，由于穿通效应导致面板显示均匀性下降的技术问题。
为解决上述问题，本发明提供的技术方案如下：
本发明提供一种像素驱动电路，包括驱动薄膜晶体管；稳压电容，所述稳压电容的第一端连接于所述驱动薄膜晶体管的控制端，所述稳压电容的第二端连接于所述驱动薄膜晶体管的第一端；第一电容，所述第一电容的第一端连接于所述驱动薄膜晶体管的所述控制端，所述第一电容的第二端连接于所述驱动薄膜晶体管的第二端；以及发光器件，所述发光器件的第一端连接于所述驱动薄膜晶体管的所述第二端，所述发光器件的第二端接地。
在本发明的至少一种实施例中，所述像素驱动电路还包括第一开关，所述第一开关的第一端连接于第一信号端，所述第一开关的第二端连接于所述驱动薄膜晶体管的所述控制端。
在本发明的至少一种实施例中，所述像素驱动电路还包括第二开关，所述第二开关的第一端连接于所述驱动薄膜晶体管的所述第二端，所述第二开关的第二端连接于第二信号端。
在本发明的至少一种实施例中，所述所述第一开关与所述第二开关为薄膜晶体管。
在本发明的至少一种实施例中，所述驱动薄膜晶体管、所述第一开关以及所述第二开关为N型金氧半场效晶体管。
在本发明的至少一种实施例中，所述第一开关为栅极薄膜晶体管。
在本发明的至少一种实施例中，所述第二开关为感测薄膜晶体管。
在本发明的至少一种实施例中，所述发光器件为有机发光二级管。
在本发明的至少一种实施例中，所述第一信号端为资料信号端。
在本发明的至少一种实施例中，所述第一电容为锁存电容。
本发明的有益效果为：本发明提供的像素驱动电路，在驱动薄膜晶体管的栅极增加稳压电容，并且将稳压电容的一端连接到高电位的VDD进行稳压，在第一开关关闭时能够降低穿通效应造成的电压损失，从而达到面板中不同位置的驱动薄膜晶体管的Vgs大致相同，流经发光器件的电流差异减小，提高面板的显示均匀性。
附图说明
为了更清楚地说明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单介绍，显而易见地，下面描述中的附图仅仅是发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施例像素驱动电路的电路图；
具体实施方式
以下各实施例的说明是参考附加的图示，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如[上]、[下]、[前]、[后]、[左]、[右]、[内]、[外]、[侧面]等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。在图中，结构相似的单元是用以相同标号表示。
本发明针对现有的像素驱动电路，由于穿通效应导致面板显示均匀性下降的技术问题，本实施例能够解决该缺陷。
图1为本发明实施例像素驱动电路的电路图，所述像素驱动电路包括驱动薄膜晶体管T1；稳压电容Cgd，所述稳压电容Cgd的第一端连接于所述驱动薄膜晶体管T1的控制端，所述稳压电容Cgd的第二端连接于所述驱动薄膜晶体管T1的第一端；第一电容Cgs，所述第一电容Cgs的第一端连接于所述驱动薄膜晶体管T1的所述控制端，所述第一电容Cgs的第二端连接于所述驱动薄膜晶体管T1的第二端；以及发光器件D，所述发光器件D的第一端连接于所述驱动薄膜晶体管T1的所述第二端，所述发光器件D的第二端接地。所述第一电容Cgs为锁存电容。所述像素驱动电路还包括第一开关T2，所述第一开关T2的第一端连接于第一信号端S1，所述第一开关T2的第二端连接于所述驱动薄膜晶体管T1的所述控制端，所述第一开关T2为栅极薄膜晶体管，所述第一信号端S1为资料信号端。所述像素驱动电路还包括第二开关T3，所述第二开关T3的第一端连接于所述驱动薄膜晶体管T1的所述第二端，所述第二开关T3的第二端连接于第二信号端S2，所述第二开关T3为感测薄膜晶体管。所述驱动薄膜晶体管T1、所述第一开关T2以及所述第二开关T3为N型金氧半场效晶体管。所述发光器件D为有机发光二级管。
由于面板中不同位置的电阻电容(RC)时间常数不同，在现有的像素驱动电路中，第一开关T2关闭时会带来不同程度的穿通效应，导致发光过程中对应不同像素的g点电压不同，面板中不同位置的驱动薄膜晶体管T1的Vgs不同，因此流经发光器件D(例如有机发光二级管)的电流大小不同，最终使得面板的显示均匀性较差。
如图1所示，本发明实施例的像素驱动电路在驱动薄膜晶体管T1的栅极增加稳压电容Cgd，并且将稳压电容Cgd的一端连接到高电位的VDD进行稳压，在第一开关T2关闭时能够降低穿通效应对g点造成的电压损失，从而达到面板中不同位置的驱动薄膜晶体管T1的Vgs大致相同，流经发光器件D的电流差异减小，提高面板的显示均匀性。
表1为现有的像素驱动电路，在高灰阶与低灰阶时显示不均匀性的数据。在低灰阶时，由于电压较小，像素驱动电路受到穿通效应的影响更为明显，不均匀性高达76.13％，且不同灰阶时不均匀性的差异也较大。
表1
不均匀性 Max Vg_FT
高灰阶 10.26％ 0.578V
低灰阶 76.13％ 0.804V
表2为本发明实施例的像素驱动电路，在高灰阶与低灰阶时显示不均匀性的数据。由于稳压电容Cgd对g点电压的维持效果，像素驱动电路受到穿通效应的影响较小，高灰阶与低灰阶时的显示均匀性均得到了大幅度的提升，且不同灰阶时不均匀性的差异也降低。其中Max Vg_FT为g点充电电压与第一开关T2关闭后g点电压下降至最低点的差值，在面板中不同位置的最大值。
表2
不均匀性 Max Vg_FT
高灰阶 3.6％ 0.28V
低灰阶 24.82％ 0.356V
有益效果：本发明提供的像素驱动电路，在驱动薄膜晶体管T1的栅极增加稳压电容Cgd，并且将稳压电容Cgd的一端连接到高电位的VDD进行稳压，在第一开关T2关闭时能够降低穿通效应对g点造成的电压损失，从而达到面板中不同位置的驱动薄膜晶体管T1的Vgs大致相同，流经发光器件D的电流差异减小，提高面板的显示均匀性。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (10)

1.一种像素驱动电路，其特征在于，包括：
驱动薄膜晶体管；
稳压电容，所述稳压电容的第一端连接于所述驱动薄膜晶体管的控制端，所述稳压电容的第二端连接于所述驱动薄膜晶体管的第一端；
第一电容，所述第一电容的第一端连接于所述驱动薄膜晶体管的所述控制端，所述第一电容的第二端连接于所述驱动薄膜晶体管的第二端；以及
发光器件，所述发光器件的第一端连接于所述驱动薄膜晶体管的所述第二端，所述发光器件的第二端接地。
2.根据权利要求1所述的像素驱动电路，其特征在于，还包括第一开关，所述第一开关的第一端连接于第一信号端，所述第一开关的第二端连接于所述驱动薄膜晶体管的所述控制端。
3.根据权利要求2所述的像素驱动电路，其特征在于，还包括第二开关，所述第二开关的第一端连接于所述驱动薄膜晶体管的所述第二端，所述第二开关的第二端连接于第二信号端。
4.根据权利要求3所述的像素驱动电路，其特征在于，所述第一开关与所述第二开关为薄膜晶体管。
5.根据权利要求4所述的像素驱动电路，其特征在于，所述驱动薄膜晶体管、所述第一开关以及所述第二开关为N型金氧半场效晶体管。
6.根据权利要求4所述的像素驱动电路，其特征在于，所述第一开关为栅极薄膜晶体管。
7.根据权利要求4所述的像素驱动电路，其特征在于，所述第二开关为感测薄膜晶体管。
8.根据权利要求5所述的像素驱动电路，其特征在于，所述发光器件为有机发光二级管。
9.根据权利要求2所述的像素驱动电路，其特征在于，所述第一信号端为资料信号端。
10.根据权利要求1所述的像素驱动电路，其特征在于，所述第一电容为锁存电容。
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