CN103354081A - 像素驱动电流提取装置及像素驱动电流提取方法 - Google Patents

像素驱动电流提取装置及像素驱动电流提取方法 Download PDF

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CN103354081A
CN103354081A CN2013102913221A CN201310291322A CN103354081A CN 103354081 A CN103354081 A CN 103354081A CN 2013102913221 A CN2013102913221 A CN 2013102913221A CN 201310291322 A CN201310291322 A CN 201310291322A CN 103354081 A CN103354081 A CN 103354081A
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drive current
switch
pixel
amplifier
circuit
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CN103354081B (zh
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宋丹娜
段立业
吴仲远
盖翠丽
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BOE Technology Group Co Ltd
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Priority to KR1020147017366A priority patent/KR101599657B1/ko
Priority to US14/362,004 priority patent/US9437139B2/en
Priority to PCT/CN2013/085520 priority patent/WO2015003435A1/zh
Priority to JP2016524655A priority patent/JP6367327B2/ja
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    • 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]
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    • 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
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Abstract

本发明涉及有机发光显示技术领域，特别涉及一种像素驱动电流提取装置及像素驱动电流提取方法。本发明中的像素驱动电流提取装置包括分别对应各色像素驱动电路的驱动电流提取电路；每个驱动电流提取电路均包括驱动电流放大转换单元以及与驱动电流计算单元；所述驱动电流放大转换单元与像素驱动电路连接，用于将像素驱动电路的驱动电流放大并转换为电压信号；所述驱动电流计算单元与所述驱动电流放大转换单元连接，用于根据所述电压信号计算像素驱动电流；对应各色像素驱动电路的驱动电流提取电路中驱动电流放大转换单元的放大倍数与该色像素驱动电流的大小成反比。

Description

像素驱动电流提取装置及像素驱动电流提取方法
技术领域
本发明涉及有机发光显示技术领域，特别涉及一种像素驱动电流提取装置及像素驱动电流提取方法。
背景技术
相比传统的液晶面板，AMOLED(Active Matrix/Organic LightEmitting Diode，有源矩阵有机发光二极管)显示面板具有反应速度更快、对比度更高、视角更广等特点，因此，AMOLED得到了显示技术开发商日益广泛的关注。
AMOLED显示面板之所以能够发光是由驱动薄膜场效应晶体管(Thin Film Transistor，TFT)在饱和状态时产生的电流所驱动，因为输入相同的灰阶电压时，不同的临界电压会产生不同的驱动电流，造成电流的不一致性，导致屏幕显示的不均匀性。为了得到上述不一致性的信息，可以提取每个像素的驱动电流，在得到每个像素的驱动电流后，可以对每个像素的驱动电压进行修正，进而改善屏幕显示的不均匀性。
由于AMOLED显示面板的红、绿、蓝三色像素的发光效率不同，因此在各色像素内的驱动电流大小也有差异，这样，在提取驱动电流时，如果采用相同放大倍数的运算放大器，各色像素的驱动电流对存储电容的充电时间会不一致，例如，较大的驱动电流需要的充电时间较短，而较小的驱动电流需要的充电时间较长，从而导致最后得到的数据不均匀。
发明内容
(一)要解决的技术问题
本发明要解决的技术问题是，针对现有技术的不足，提供一种能够获得均匀数据的像素驱动电流提取装置及像素驱动电流提取方法，为后续信号处理提供了良好的数据支持。
(二)技术方案
本发明技术方案如下：
一种像素驱动电流提取装置，包括分别对应各色像素驱动电路的驱动电流提取电路；每个驱动电流提取电路均包括驱动电流放大转换单元以及与驱动电流计算单元；
所述驱动电流放大转换单元与像素驱动电路连接，用于将像素驱动电路的驱动电流放大并转换为电压信号；
所述驱动电流计算单元与所述驱动电流放大转换单元连接，用于根据所述电压信号计算像素驱动电流；
对应各色像素驱动电路的驱动电流提取电路中的驱动电流放大转换单元的放大倍数与该色像素驱动电流的大小成反比。
优选的，所述驱动电流放大转换单元包括第一放大器以及第一电容；
所述第一放大器的第一输入端分别与第一电容的一端以及该提取电路对应的像素驱动电路连接，第二输入端连接参考电压；
所述第一放大器的输出端分别与第一电容的另一端以及驱动电流计算单元连接；
对应各色像素驱动电路的驱动电流提取电路中第一放大器的放大倍数与该色像素驱动电流的大小成反比。
优选的，所述驱动电流放大转换单元还包括与所述第一电容并联的第一开关。
优选的，所述像素驱动电流提取装置包括分别对应红、绿、蓝三色像素驱动电路的驱动电流提取电路；在所述红、绿、蓝三色像素驱动电路的驱动电流提取电路中，对应绿色像素驱动电路的驱动电流提取电路中第一放大器的放大倍数最大，对应蓝色像素驱动电路的驱动电流提取电路中第一放大器的放大倍数最小。
优选的，所述驱动电流计算单元用于将所述电压信号分压后进行差分以及放大运算得到像素驱动电流。
优选的，所述驱动电流提取装置还包括与所述第一电容并联的第一开关；
所述驱动电流计算单元包括第二放大器、第二开关、第三开关、第二电容以及第三电容；
所述第一放大器的输出端分别与所述第二开关的一端以及第三开关的一端连接；
所述第二开关的另一端分别与第二电容的一端以及第二放大器的第一输入端连接，所述第二电容的另一端接地；
所述第三开关的另一端分别与第三电容的一端以及第二放大器的第二输入端连接，所述第三电容的另一端接地。
优选的，所述第一开关、第二开关以及第三开关均为开关晶体管。
优选的，所述第一开关、第二开关以及第三开关分别与时序控制器连接，所述时序控制器用于分别控制第一开关、第二开关以及第三开关的开闭时序。
优选的，所述驱动电流计算单元还包括与所述第二放大器的输出端连接的差分模数转换器，所述差分模数转换器用于将模拟信号转换为数字信号。
优选的，所述第一放大器为运算放大器，用于将输入电流转换为电压；所述第二放大器为全差分运算放大器，用于计算第二电容与第三电容的电压差值并且进行放大。
本发明还提供了一种根据上述任意一种像素驱动电流提取装置实现的提取方法：
一种像素驱动电流提取方法，包括驱动电流提取过程以及驱动电流计算过程；所述驱动电流提取过程中，将像素驱动电路的驱动电流放大并转换为电压信号，其中，对各色像素驱动电流的放大倍数与该色像素驱动电流的大小成反比；所述驱动电流计算过程中，将所述电压信号分压后进行差分以及放大运算得到像素驱动电流。
优选的，包括步骤：
S1：导通第一开关、第二开关以及第三开关，使第一放大器的输出端的电压复位为参考电压；
S2：关断第一开关，从像素驱动电路流入的电流对第一电容充电；
S3：依次关断第二开关和第三开关，得到第二电容与第三电容的电压值，通过第二放大器计算第二电容与第三电容的电压差值并且进行放大。
优选的，所述步骤S3之后还包括：
S4：将放大后的电压差值输入到差分模数转换器，得到数字信号。
(三)有益效果
本发明所提供的像素驱动电流提取装置，根据各色像素驱动电流的大小，有选择性的为发光效率较高的像素即较小的驱动电流设置较大的放大倍数，为发光效率较低的像素即较小的驱动电流设置较大的放大倍数，从而在保证不失真的情况下，均匀提取各色像素的驱动电流，并进行合理放大，为后续信号处理提供了良好的数据支持。
附图说明
图1是本发明实施例中像素驱动电流提取装置的模块连接示意图；
图2是本发明实施例中像素驱动电流提取装置的一种实现结构示意图；
图3是本发明实施例中像素驱动电流提取装置的另一种实现结构示意图；
图4是本发明实施例中像素驱动电流提取装置的又一种实现结构示意图；
图5是图4中驱动电流提取电路的驱动时序图。
图中：1：第一放大器；2：第二放大器；3：差分模数转换器；4：像素驱动电路。
具体实施方式
下面结合附图和实施例，对本发明的具体实施方式做进一步描述。以下实施例仅用于说明本发明，但不用来限制本发明的范围。
本实施例中首先提供了一种像素驱动电流提取装置，如图1中所示，包括分别对应各色像素驱动电路的驱动电流提取电路，驱动电流提取电路主要包括驱动电流放大转换单元以及与驱动电流放大转换单元连接的驱动电流计算单元；驱动电流放大转换单元与像素驱动电路连接，用于将像素驱动电路的驱动电流放大并转换为电压信号；驱动电流计算单元与驱动电流放大转换单元连接，用于根据电压信号计算像素驱动电流；对应各色像素驱动电路的驱动电流提取电路中驱动电流放大转换单元的放大倍数与该色像素驱动电流的大小成反比。
本实施例中，各色像素分别为红色像素(R)、绿色像素(G)以及蓝色像素(B)；三色像素驱动电流IR、IG、IB分别接入驱动电流放大转换单元，驱动电流放大转换单元将输入的电流信号转换为电压并输入驱动电流计算单元得到所需的驱动电流值。
如图2中所示，本实施例中，驱动电流放大转换单元主要包括第一放大器1以及第一电容C1；第一放大器1优选为运算放大器，其主要用于将输入电流转换为电压并进行放大；第一放大器1的第一输入端分别与第一电容C1的一端以及该提取电路对应的像素驱动电路连接、第二输入端连接参考电压Vref，像素驱动电路主要用于为各色像素提供驱动电流；第一放大器1的输出端分别与第一电容C1的另一端以及驱动电流计算单元连接；为了能够均匀提取各色像素的驱动电流，本实施例中对应各色像素驱动电路的驱动电流提取电路中第一放大器1的放大倍数与该色像素驱动电流的大小成反比。例如，绿色像素的发光效率最高，因此绿色像素的驱动电流最小，蓝色像素的发光效率最低，因此蓝色像素的驱动电流最大，所以对应绿色像素驱动电路的驱动电流提取电路中第一放大器1的放大倍数最大，对应红色像素驱动电路的驱动电流提取电路中第一放大器1的放大倍数次之，对应蓝色像素驱动电路的驱动电流提取电路中第一放大器1的放大倍数最小，这样，使较大的驱动电流需要的充电时间缩短，使较小的驱动电流需要的充电时间适当延长，最终使各色像素的驱动电流对第一电容C1的充电时间大致相同，从而使最后得到的数据均匀。
图3中电路是上述驱动电流提取装置一种较优的实现方式，其中驱动电流提取装置还包括与第一电容C1并联的第一开关T1；驱动电流计算单元包括第二放大器2、第二开关T2、第三开关T3、第二电容C2以及第三电容C3等；第一放大器1的输出端分别与第二开关T2的一端以及第三开关T3的一端连接；第二开关T2的另一端分别与第二电容C2的一端以及第二放大器2的第一输入端连接，第二电容C2的另一端接地；第三开关T3的另一端分别与第三电容C3的一端以及第二放大器2的第二输入端连接，第三电容C3的另一端接地，第二放大器2主要用于计算第二电容C2与第三电容C3的电压差值并且进行放大，其优选为全差分运算放大器；最后，第二放大器2的输出端与差分模数转换器4连接，将第二放大器2输出的的模拟信号转换为方便后续处理的数字信号。
如图4中所示，像素驱动电路为典型的2T1C结构，即包括开关晶体管T5、驱动晶体管DTFT以及存储电容C；驱动晶体管DTFT的漏极提供像素驱动电流，第一放大器1的输入端与驱动晶体管DTFT的漏极连接；为了方便时序控制，第一开关T1、第二开关T2以及第三开关T3均优选为开关晶体管或者其他可控模拟开关；本实施例中，第一开关T1、第二开关T2以及第三开关T3均为开关晶体管；然后将第一开关T1、第二开关T2以及第三开关T3分别与时序控制器连接，时序控制器用于分别控制第一开关T1、第二开关T2以及第三开关T3的开闭时序。
本发明还提供了一种根据上述像素驱动电流提取装置实现的提取方法，该像素驱动电流提取方法主要包括驱动电流提取过程以及驱动电流计算过程；本发明中驱动电流提取方法的主要改进点之一在于，驱动电流提取过程中，对各色像素驱动电流的放大倍数与该色像素驱动电流的大小成反比，这样，使较大的驱动电流需要的充电时间缩短，使较小的驱动电流需要的充电时间适当延长，最终使各色像素的驱动电流对第一电容C1的充电时间大致相同，从而使最后得到的数据均匀。
本实施例中，对于图4中所示的驱动电流提取装置的驱动时序具体如图5中所示，下面结合图4以及图5对各个时序分别加以说明：
S1：时序控制器输出高电平信号，导通第一开关T1、第二开关T2以及第三开关T3，使第一放大器1的输出端的电压复位为参考电压Vref；
S2：在时序控制器的控制信号作用下，关断第一开关T1，第二开关T2和第三开关T3仍然保持导通，这时从像素驱动电路4流入的电流对第一电容C1进行充电，第一电容C1两端的电量随时间成线性增长，因此第一放大器1的输出端的电压随时间成线性变化；
S3：在时序控制器的控制信号作用下，依次关断第二开关T2和第三开关T3，得到第二电容C2与第三电容C3的电压值，其中，第三开关T3保持导通的时间较第二开关T2保持导通的时间长，因此第三电容C3所存储的电压比第二电容C2所存储的电压大，将第二电容C2与第三电容C3所存储的电压作为全差分运算放大器的输入，通过全差分运算放大器计算第二电容C2与第三电容C3的电压差值并且进行放大。
其中，步骤S3之后还包括：
S4：将放大后的电压差值输入到差分模数转换器4，得到数字信号。
以上实施方式仅用于说明本发明，而并非对本发明的限制，有关技术领域的普通技术人员，在不脱离本发明的精神和范围的情况下，还可以做出各种变化和变型，因此所有等同的技术方案也属于本发明的保护范畴。

Claims (13)

1.一种像素驱动电流提取装置，其特征在于，包括分别对应各色像素驱动电路的驱动电流提取电路；每个驱动电流提取电路均包括驱动电流放大转换单元以及与驱动电流计算单元；
所述驱动电流放大转换单元与像素驱动电路连接，用于将像素驱动电路的驱动电流放大并转换为电压信号；
所述驱动电流计算单元与所述驱动电流放大转换单元连接，用于根据所述电压信号计算像素驱动电流；
对应各色像素驱动电路的驱动电流提取电路中的驱动电流放大转换单元的放大倍数与该色像素驱动电流的大小成反比。
2.根据权利要求1所述的驱动电流提取装置，其特征在于，所述驱动电流放大转换单元包括第一放大器以及第一电容；
所述第一放大器的第一输入端分别与第一电容的一端以及该提取电路对应的像素驱动电路连接，第二输入端连接参考电压；
所述第一放大器的输出端分别与第一电容的另一端以及驱动电流计算单元连接；
对应各色像素驱动电路的驱动电流提取电路中第一放大器的放大倍数与该色像素驱动电流的大小成反比。
3.根据权利要求2所述的驱动电流提取装置，其特征在于，所述驱动电流放大转换单元还包括与所述第一电容并联的第一开关。
4.根据权利要求2或3所述的驱动电流提取装置，其特征在于，所述像素驱动电流提取装置包括分别对应红、绿、蓝三色像素驱动电路的驱动电流提取电路；
在所述红、绿、蓝三色像素驱动电路的驱动电流提取电路中，对应绿色像素驱动电路的驱动电流提取电路中第一放大器的放大倍数最大，对应蓝色像素驱动电路的驱动电流提取电路中第一放大器的放大倍数最小。
5.根据权利要求2或3所述的驱动电流提取装置，其特征在于，所述驱动电流计算单元用于将所述电压信号分压后进行差分以及放大运算得到像素驱动电流。
6.根据权利要求5所述的驱动电流提取装置，其特征在于，所述驱动电流计算单元包括第二放大器、第二开关、第三开关、第二电容以及第三电容；
所述第一放大器的输出端分别与所述第二开关的一端以及第三开关的一端连接；
所述第二开关的另一端分别与第二电容的一端以及第二放大器的第一输入端连接，所述第二电容的另一端接地；
所述第三开关的另一端分别与第三电容的一端以及第二放大器的第二输入端连接，所述第三电容的另一端接地。
7.根据权利要求6所述的驱动电流提取装置，其特征在于，所述第一开关、第二开关以及第三开关均为开关晶体管。
8.根据权利要求7所述的驱动电流提取装置，其特征在于，所述第一开关、第二开关以及第三开关分别与时序控制器连接，所述时序控制器用于分别控制第一开关、第二开关以及第三开关的开闭时序。
9.根据权利要求6所述的驱动电流提取装置，其特征在于，所述驱动电流计算单元还包括与所述第二放大器的输出端连接的差分模数转换器，所述差分模数转换器用于将模拟信号转换为数字信号。
10.根据权利要求6-9任意一项所述的驱动电流提取装置，其特征在于，所述第一放大器为运算放大器，用于将输入电流转换为电压；所述第二放大器为全差分运算放大器，用于计算第二电容与第三电容的电压差值并且进行放大。
11.一种像素驱动电流提取方法，包括驱动电流提取过程以及驱动电流计算过程；其特征在于，所述驱动电流提取过程中，将像素驱动电路的驱动电流放大并转换为电压信号，其中，对各色像素驱动电流的放大倍数与该色像素驱动电流的大小成反比；所述驱动电流计算过程中，将所述电压信号分压后进行差分以及放大运算得到像素驱动电流。
12.根据权利要求11所述的驱动电流提取方法，其特征在于，包括步骤：
S1：导通第一开关、第二开关以及第三开关，使第一放大器的输出端的电压复位为参考电压；
S2：关断第一开关，从像素驱动电路流入的电流对第一电容充电；
S3：依次关断第二开关和第三开关，得到第二电容与第三电容的电压值，通过第二放大器计算第二电容与第三电容的电压差值并且进行放大。
13.根据权利要求12所述的驱动电流提取方法，其特征在于，所述步骤S3之后还包括：
S4：将放大后的电压差值输入到差分模数转换器，得到数字信号。
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US20090127432A1 (en) * 2007-11-19 2009-05-21 Lee Joo-Hyung Light sensor, display apparatus including the same, and control method thereof
CN101470138A (zh) * 2007-12-26 2009-07-01 统宝光电股份有限公司 检测电路及信号检测方法
CN203311819U (zh) * 2013-07-11 2013-11-27 京东方科技集团股份有限公司 像素驱动电流提取装置

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WO2015003435A1 (zh) * 2013-07-11 2015-01-15 京东方科技集团股份有限公司 像素驱动电流提取装置及像素驱动电流提取方法
US9437139B2 (en) 2013-07-11 2016-09-06 Boe Technology Group Co., Ltd. Pixel driving current extracting apparatus and pixel driving current extracting method
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CN115035844A (zh) * 2022-06-27 2022-09-09 厦门天马微电子有限公司 像素电路及其驱动方法、显示面板

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CN103354081B (zh) 2016-04-20
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WO2015003435A1 (zh) 2015-01-15
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