CN108091306A - 平板显示设备的数据驱动电路 - Google Patents

平板显示设备的数据驱动电路 Download PDF

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CN108091306A
CN108091306A CN201711144562.3A CN201711144562A CN108091306A CN 108091306 A CN108091306 A CN 108091306A CN 201711144562 A CN201711144562 A CN 201711144562A CN 108091306 A CN108091306 A CN 108091306A
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amplifying unit
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曹畅训
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LG Display Co Ltd
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Abstract

公开了一种平板显示设备的数据驱动电路，包括：移位寄存器，配置成响应于源极起始脉冲和源极采样时钟而输出采样信号；锁存器，配置成响应于采样信号而顺序采样数字数据信号，并响应于源极输出使能信号同时输出与一个采样行对应的数据信号；数模转换单元，包括多个数模转换器并配置成响应于第一至第n伽马灰度电压而将与一行对应的数据信号转换成模拟数据电压；输出放大单元，包括多个放大器并配置成放大模拟数据电压；开关阵列，配置成将输出放大单元的两个相邻放大器的数据电压交替输出，使得输出放大单元的两个相邻放大器的数据电压提供给一个焊盘。通过在下一个水平时间段期间保持建立并执行交叠驱动，可以确保建立时间并防止数据信号的失真。

Description

平板显示设备的数据驱动电路
相关申请的交叉引用
本申请要求2016年11月21日提交的韩国专利申请第10-2016-0154918号的权益，其内容通过引用并入本文，如同其在本文中完全阐述那样。
技术领域
本发明涉及一种平板显示设备，以及更具体地涉及一种用于通过在下一水平时间段期间保持建立(settling)并执行交叠驱动来确保建立时间并防止数据信号的失真的平板显示设备的数据驱动电路。
背景技术
用于使用数字数据来显示图像的代表性平板显示设备包括使用液晶的液晶显示器(LCD)和使用有机发光二极管(OLED)的OLED显示器。
图1是示意性示出一般的LCD设备的框图。
一般地，如图1所示，LCD包括：定时控制器130、栅极驱动器140、数据驱动器150、液晶面板160和背光单元170。
定时控制器130输出用于控制栅极驱动器140的操作定时的栅极定时控制信号GDC和用于控制数据驱动器150的操作定时的数据定时控制信号DDC。定时控制器130将从图像处理器提供的数据信号DATA与数据定时控制信号DDC一起提供给数据驱动器150。
栅极驱动器140响应于从定时控制器130提供的栅极定时控制信号GDC而将扫描脉冲顺序地输出到各条栅极线GL。栅极驱动器140可以以安装在液晶面板160中的面板中栅极(GIP)型或集成电路(IC)型形成。
数据驱动器150响应于从定时控制器130提供的数据定时控制信号DDC而采样并锁存数据信号DATA，并将采样和锁存的数据信号DATA转换成伽马参考电压。数据驱动器150在一帧的时段处反转并输出数据电压的极性。数据驱动器150通过每条数据线DL将数据电压提供给液晶面板160中包含的子像素SP。数据驱动器150可以以IC型形成。
液晶面板160与从栅极驱动器140提供的扫描信号和从数据驱动器150提供的数据电压相对应地显示图像。液晶面板160包括用于控制通过背光单元170提供的光的子像素SP。一个子像素包括开关晶体管、存储电容器和液晶层。开关晶体管的栅电极连接至栅极线GL并且开关晶体管的源电极连接至数据线DL。存储电容器形成在连接至开关晶体管的漏电极的像素电极与连接至公共电压线的公共电极之间。也就是说，液晶层形成在连接至开关晶体管的漏电极的像素电极与连接至公共电压线的公共电极之间。
根据像素电极和公共电极的结构，液晶面板160以扭曲向列(TN)模式、垂直对准(VA)模式、平面内切换(IPS)模式、边缘场切换(FFS)模式或电控制双折射(ECB)模式来实现。
液晶面板160可以由红色、绿色和蓝色子像素实现，或者可以由白色子像素以及红色、绿色和蓝色子像素来实现，以便降低电流消耗。
背光单元170使用发光的光源来向液晶面板160提供光。
现在，将更详细地描述数据驱动器150。
图2是示意性示出一般的数据驱动器的内部配置的框图。
如图2所示，数据驱动器包括移位寄存器SR、第一锁存器LAT1、第二锁存器LAT2、数模(DA)转换单元DAC、开关阵列143和输出放大单元145。
数据驱动器将数字数据信号转换成模拟数据电压，并且根据移位寄存器SR、第一锁存器LAT1和第二锁存器LAT2、DA转换单元DAC、开关阵列143以及输出放大单元145的操作，通过其输出通道CH1至CHN输出模拟数据电压。在下文中，将简要描述在数据驱动器中包括的配置。
移位寄存器SR响应于从定时控制器130提供的源极起始脉冲和源极采样时钟而输出采样信号。第一锁存器LAT1和第二锁存器LAT2响应于从移位寄存器SR输出的采样信号而顺序地对数字数据信号进行采样，并且响应于源极输出使能信号SOE而同时输出与一个采样行相对应的数据信号。
DA转换单元DAC响应于从伽马电压发生器(未示出)输出的第一至第n伽马灰度电压而将与一行相对应的数据信号转换成模拟数据电压。
开关阵列143交替输出DA转换单元DAC的两个相邻数模转换器(DAC)的数据电压。
输出放大单元145位于开关阵列143的后侧，并且放大从开关阵列143输出的数据电压。
现在将描述DA转换单元DAC、开关阵列143和输出放大单元145的详细配置。
图3示出了一般的数据驱动器中的DA转换单元DAC、开关阵列143和输出放大单元145的详细配置。
DA转换单元DAC包括作为通道的多个DAC。也就是说，如果存在3600个通道，则DA转换单元DAC包括3600个DAC DAC1至DAC3600。
开关阵列143执行切换操作，使得交替输出多个DAC DAC1至DAC3600中的奇数编号的DAC和偶数编号的DAC的数据电压。
输出放大单元145包括与通道数目的一半相对应的多个放大器AMP1至AMP1800。也就是说，如果存在3600个通道，则输出放大单元145包括1800个放大器AMP1至AMP1800。放大器AMP1至AMP1800放大并输出从与多个DAC中的两个相邻DAC相对应的每对DAC输出的数据电压。
然而，这样的传统数据驱动电路具有以下问题。
图4是被参考用于说明传统数据驱动电路的问题的流程图。
也就是说，为了即使在短的一个水平时间段中也可以实现良好的充电特性，由于充电特性受到DA转换单元DAC的延迟的影响，并且由于在短的一个水平时间段期间应该仅由一个放大器来确保快速转换速率，因此难以保证建立时间。
更详细地，在传统的数据驱动电路中，在一个水平时间段为2.7μs的情况下，达到目标电压的99.3％的建立时间为2.11μs。因此，该数据驱动电路难以确保建立时间。
此外，由于开关阵列143位于DA转换单元DAC与输出放大单元145之间，因此在DA转换单元DAC的输出信号和输出放大单元145的输出信号中生成了纹波，从而导致数据信号的失真。
发明内容
因此，本发明涉及一种平板显示设备的数据驱动电路，其基本上消除了由于现有技术的限制和缺点而引起的一个或更多个问题。
本发明的目的是提供一种平板显示设备的数据驱动电路，其用于通过将DA转换单元的DAC和输出放大单元的放大器配置成数目上相等并对输出放大单元和焊盘之间的开关阵列进行配置，在下一水平时间段期间保持建立、通过交叠驱动来确保建立时间以及防止数据信号的失真。
本发明的另外的优点、目的和特征将在下面的描述中部分地阐述，并且将在本领域普通技术人员在阅读以下内容时部分地变得明显，或者可以从本发明的实践中获悉。本发明的目的和其他优点可以通过在所写描述和权利要求书以及附图中特别指出的结构来实现和获得。
为了实现这些目的和其他优点并且根据本发明的目的，如本文中体现和广泛描述的，一种平板显示设备的数据驱动电路包括：移位寄存器，其被配置成响应于来自定时控制器的源极起始脉冲和源极采样时钟而输出采样信号；锁存器，其被配置成响应于采样信号而顺序地对数字数据信号进行采样，并且响应于源极输出使能信号而同时输出与一个采样行相对应的数据信号；数模转换单元，其包括多个数模转换器并且被配置成响应于第一至第n伽马灰度电压而将与一行相对应的数据信号转换成模拟数据电压，n为正整数；输出放大单元，其包括多个放大器并且被配置成放大模拟数据电压；以及开关阵列，其被配置成将输出放大单元的两个相邻放大器的数据电压交替地输出，使得将输出放大单元的两个相邻放大器的数据电压提供给一个焊盘(pad)。
应当理解，本发明的前述一般性描述和以下详细描述都是示例性和说明性的，并且旨在提供对所要求保护的本发明的进一步说明。
附图说明
附图被包括以提供对本发明的进一步理解并且附图被并入并构成本申请的一部分，附图示出了本发明的实施方式并且与说明书一起用于说明本发明的原理。在附图中：
图1是示意性示出一般的LCD设备的框图；
图2是示意性示出一般的数据驱动器的内部配置的框图；
图3示出了图2中的数模转换器、开关阵列和输出放大器的详细配置；
图4是被参考用于说明传统驱动电路的问题的流程图；
图5是示意性示出根据本发明的数据驱动器的内部配置的框图；
图6示出了根据本发明的数模转换器、输出放大器和开关阵列的详细配置；以及
图7是根据本发明的数据驱动电路的输出的波形图。
具体实施方式
现在将参照附图详细描述根据本发明的平板显示设备的数据驱动电路。只要可能的情况下，在整个附图中将使用相同的附图标记来指代相同或类似的部件。
与图1所示的LCD设备类似，根据本发明的平板显示设备包括定时控制器、栅极驱动器、数据驱动器和平坦面板。
定时控制器输出用于控制栅极驱动器的操作定时的栅极定时控制信号和用于控制数据驱动器的操作定时的数据定时控制信号。定时控制器将从图像处理器提供的数据信号DATA与数据定时控制信号一起提供给数据驱动器。
栅极驱动器响应于从定时控制器提供的栅极定时控制信号而将扫描脉冲顺序地输出到每条栅极线GL。
数据驱动器响应于从定时控制器提供的数据定时控制信号而采样并锁存数据信号DATA，并将采样和锁存的数据信号转换成伽马参考电压。数据驱动器通过每条数据线DL将数据电压提供给平坦面板中包括的子像素SP。
平坦面板响应于从栅极驱动器提供的扫描信号和从数据驱动器提供的数据电压而显示图像。
平坦面板包括液晶面板或OLED面板。
现在将更详细地描述根据本发明的数据驱动器的配置。
图5是示意性示出根据本发明的实施方式的数据驱动器的内部配置的框图。
如图5所示，根据本发明的实施方式的数据驱动器包括：移位寄存器SR、第一锁存器LAT1、第二锁存器LAT2、DA转换单元DAC、输出放大单元145和开关阵列143。
移位寄存器SR响应于从定时控制器提供的源极起始脉冲和源极采样时钟而输出采样信号。第一锁存器LAT1和第二锁存器LAT2响应于从移位寄存器SR输出的采样信号而顺序地采样数字数据信号，并且响应于源极输出使能信号SOE而同时输出与一个采样行相对应的数据信号。
DA转换单元DAC响应于从伽马电压发生器(未示出)输出的第一至第n伽马灰度电压，将与一行相对应的数据信号转换成模拟数据电压。
输出放大单元145位于DA转换单元DAC的后侧，并且放大和输出从DA转换单元DAC输出的数据电压。
开关阵列143使得输出放大单元145的多个放大器AMP1至AMP3600中的奇数编号的放大器AMP1、AMP3、......、AMP3599的数据电压和偶数编号的放大器AMP2、AMP4、......、AMP3600的数据电压交替地输出。也就是说，开关阵列143将输出放大单元的两个相邻放大器的数据电压交替输出，使得输出放大单元的两个相邻放大器的数据电压被提供给一个焊盘。
现在将描述DA转换单元DAC、开关阵列143和输出放大单元145的详细配置。
图6示出了根据本发明的数据驱动器中的DA转换单元DAC、输出放大单元145和开关阵列143的详细配置。
DA转换单元DAC包括与通道数目一样多的多个DAC。输出放大单元145也包括与通道数目一样多的多个放大器AMP1至AMP3600。
也就是说，如果存在3600个通道，则DA转换单元DAC和输出放大单元145分别包括3600个DAC DAC1至DAC3600和3600个放大器AMP1至AMP3600。
开关阵列143交替输出放大器AMP1至AMP3600中的奇数编号的放大器AMP1、AMP3、AMP5、......的数据电压和偶数编号的放大器AMP2、AMP4、AMP6、......的数据电压，使得放大器AMP1至AMP3600中的两个相邻放大器的数据电压被提供给焊盘PAD1至PAD1800中的一个焊盘。
图7是根据本发明的数据驱动电路的输出的波形图。
由于开关阵列143不位于DA转换单元DAC与输出放大单元145之间，因此在DA转换单元DAC的输出信号和输出放大单元145的输出信号中不会产生纹波。
此外，在根据本发明的数据驱动电路中，在下一个水平时间段期间保持建立，并且在两个相邻放大器的输出中保持交叠。因此，由于在一个水平时间段为2.7μs的情况下达到目标电压的99.3％的建立时间为0.97μs，因此可以充分确保建立时间。
根据本发明的如上所述配置的平板显示设备的数据驱动电路具有以下效果。
虚拟现实(VR)模式的显示设备需要在短的一个水平(1H)时间段内的快速建立时间。根据本发明，DA转换单元的DAC的数目等于输出放大单元的放大器的数目，并且开关阵列布置在输出放大单元与焊盘之间。因此，由于在下一个水平时间段期间保持建立并且执行交叠驱动，因此可以在短的1H时间段内充分确保建立时间，并且可以防止数据信号的失真。
对于本领域技术人员明显的是，在不脱离本发明的精神或范围的情况下可以对本发明进行多种修改和变化。因此，本发明旨在涵盖在所附权利要求书及其等同方案的范围内的本发明的修改和变化。

Claims (3)

1.一种平板显示设备的数据驱动电路，包括：
移位寄存器，所述移位寄存器被配置成响应于来自定时控制器的源极起始脉冲和源极采样时钟而输出采样信号；
锁存器，所述锁存器被配置成响应于所述采样信号而顺序地采样数字数据信号，并且响应于源极输出使能信号而同时输出与一个采样行相对应的数据信号；
数模转换单元，所述数模转换单元包括多个数模转换器，并且所述数模转换单元被配置成响应于第一至第n伽马灰度电压而将与一行相对应的数据信号转换成模拟数据电压，n为正整数；
输出放大单元，所述输出放大单元包括多个放大器并且被配置成放大所述模拟数据电压；以及
开关阵列，所述开关阵列被配置成将所述输出放大单元的两个相邻放大器的数据电压交替输出，使得所述输出放大单元的两个相邻放大器的数据电压被提供给一个焊盘。
2.根据权利要求1所述的数据驱动电路，其中，所述数模转换单元和所述输出放大单元分别包括与通道数目相对应的数模转换器和放大器。
3.根据权利要求1所述的数据驱动电路，其中，所述开关阵列执行切换操作，使得交替地输出所述多个放大器中的奇数编号的放大器的数据电压和偶数编号的放大器的数据电压。
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