CN105741730B - 显示装置及其驱动方法 - Google Patents

显示装置及其驱动方法 Download PDF

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CN105741730B
CN105741730B CN201510779447.8A CN201510779447A CN105741730B CN 105741730 B CN105741730 B CN 105741730B CN 201510779447 A CN201510779447 A CN 201510779447A CN 105741730 B CN105741730 B CN 105741730B
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voltage
supply unit
load
variation
output voltage
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CN105741730A (zh
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金丁宰
韩在元
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LG Display Co Ltd
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    • 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]
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    • 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
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    • 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]
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    • G09G3/34Control 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 by control of light from an independent source
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  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Plasma & Fusion (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

本发明提供了显示装置及其驱动方法。显示装置包括显示面板、驱动器、供电单元和定时控制器。供电单元可以向驱动器提供电压。供电单元可以在负载变化之前执行补偿操作以改变从供电单元自身输出的输出电压以对应于负载的变化。

Description

显示装置及其驱动方法
本申请要求于2014年12月24日提交的韩国专利申请第10-2014-0188914号的权益,出于所有目的,其通过引用被合并到本文中,如同在本文中被充分地阐述一样。
技术领域
本公开涉及显示装置及其驱动方法。
背景技术
随着信息技术的发展,作为连接用户和信息的媒介的显示装置的市场已经扩大。与此一致,显示装置如有机发光显示装置、液晶显示器(LCD)和等离子显示面板(PDP)的应用也已经增加。
一些上述显示装置例如LCD或有机发光显示装置包括:包括以矩阵形式布置的多个子像素的显示面板、驱动显示面板的驱动器、以及控制驱动器的定时控制器。驱动器包括向显示面板提供扫描信号(或栅极信号)的扫描驱动器和向显示面板提供数据信号的数据驱动器。
当显示面板基于从供电单元输出的电压以及从扫描驱动器和数据驱动器输出的扫描信号和数据信号发光或者使得光能够通过其传输时,上述显示装置显示特定图像。
在相关技术显示装置中,当从供电单元输出的电压由于负载的变化而显著波动时并且当波动程度随负载的变化而变化时,在显示面板上会产生水平串扰(X-talk)或屏幕异常。具体地,当每子像素形成大量薄膜晶体管(TFT)时,与有机发光二极管(OLED)类似,更难预测显示面板中产生的水平串扰量,因此,该问题需要解决。
发明内容
在本公开的一个方面中,提供了一种显示装置,该显示装置包括显示面板、驱动器、供电单元和定时控制器。显示面板可以显示图像。驱动器可以包括驱动显示面板的数据驱动器和扫描驱动器。供电单元可以向驱动器提供电压。在负载变化之前,供电单元自身可以执行改变从供电单元输出的输出电压的补偿操作以对应于负载的变化。
在本公开的另一方面中,还提供了一种用于驱动显示装置的方法。用于驱动显示装置的方法可以包括:根据数据信号分析并预测输出电流量;根据该输出电流量分析输出电压的瞬态电流量;根据该瞬态电流量确定输出电压的变化;基于该输出电压的变化和同步信号或与该同步信号相对应的控制信号来限定瞬态电流的产生段;以及在瞬态电流产生之前,改变供电单元的输出电压。
附图说明
本申请包括附图以提供对本发明的进一步理解并且附图被合并在本说明书中并构成本说明书的一部分,附图示出本公开的实施方案,并且与说明书一起用于解释本公开的原理。在附图中:
图1是示意性示出显示装置的框图;
图2是示意性示出图1中所示的子像素的视图;
图3是示出根据本公开第一实施方案的装置的一部分的配置的视图;
图4是示出根据本公开第二实施方案的装置的一部分的配置的视图;
图5是示出根据常规提出的方案的负载电流与电源之间的关系的波形图;
图6是示出根据一个实施方案的负载电流与电源之间的关系的波形图;
图7是示意性示出采用本公开第一实施方案的小型有机发光显示装置的视图;
图8是示出用于驱动根据本公开一个实施方案的显示装置的方法的流程图;
图9是示出根据图8的驱动方法的负载电流与电源之间的关系的波形图;以及
图10是示出常规提出的方案与本发明一个实施方案之间的比较的视图。
具体实施方式
现在将详细地参考本公开的实施方案,在附图中示出本公开的实例。
在下文中,将参考附图详细描述本公开的实施方案。
根据本公开一个实施方案的显示装置被实现为电视机、机顶盒(STB)、导航装置、视频播放器、蓝光播放器、个人计算机(PC)、家庭影院和移动电话。可以选择液晶显示面板、有机发光显示面板、电泳显示面板或等离子显示面板作为显示装置的显示面板,但本公开不限于此。然而,在下文中,出于描述的目的,将有机发光显示装置描述为一个实例。
图1是示意性示出显示装置的框图,以及图2是示意性示出图1中所示的子像素的视图。
如图1所示,显示装置包括图像提供单元110、定时控制器120、扫描驱动器130、数据驱动器140、显示面板150和供电单元180。
图像提供单元110对数据信号进行处理并且将该数据信号连同垂直同步信号、水平同步信号、数据使能信号和时钟信号一起输出。图像提供单元110通过低电压差分信令(LVDS)接口或最小化转换差分信令(TMDS)接口将垂直同步信号、水平同步信号、数据使能信号、时钟信号和数据信号提供给定时控制器120。
定时控制器120从图像提供单元110接收数据信号DATA等并且输出用于控制扫描驱动器130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140的操作定时的数据定时控制信号DDC。
定时控制器120通过通信接口输出数据信号DATA以及栅极定时控制信号GDC和数据定时控制信号DDC,并且对扫描驱动器130和数据驱动器140的操作定时进行控制。
响应于从定时控制器120提供的栅极定时控制信号GDC,扫描驱动器130输出扫描信号(或栅极信号),同时将栅极电压的电平移位。扫描驱动器130包括电平移位器和移位寄存器。
扫描驱动器130通过扫描线GL1至GLm向显示面板150中包括的子像素SP提供扫描信号。扫描驱动器130可以形成为集成电路(IC)或者以板内栅极(gate-in-panel)方式形成在显示面板150上。扫描驱动器130中以板内栅极方式形成的一部分是移位寄存器。
响应于从定时控制器120提供的数据定时控制信号DDC,数据驱动器140对数据信号DATA进行采样并且锁存该数据信号DATA,根据伽马参考电压将模拟信号转换成数字信号,并且输出经转换的数字信号。
数据驱动器140通过数据线DL1至DLn向显示面板150中包括的子像素SP提供数据信号DATA。数据驱动器140形成为集成电路(IC)。
供电单元180产生并输出电压如第一源电压VDD、第二源电压VCC和低电位电压GND。从供电单元180输出的电压有区分地提供至定时控制器120、扫描驱动器130、数据驱动器140和显示面板150。
响应于从扫描驱动器130提供的扫描信号和从数据驱动器140提供的数据信号DATA,显示面板150显示图像。显示面板150包括子像素SP。
如图2所示,单个子像素包括与扫描线GL1和数据线DL1连接(或者以扫描线GL1与数据线DL1之间的交点形成)的开关薄膜晶体管(TFT)SW以及响应于通过开关TFT SW提供的数据信号DATA而进行操作的像素电路PC。根据像素电路PC的配置,子像素SP配置为包括液晶元件的液晶显示面板或包括有机发光元件的有机发光显示面板。
当显示面板150配置为液晶显示面板时,显示面板150可以以扭曲向列(TN)模式、垂直取向(VA)模式、面内切换(IPS)模式、边缘场切换(FFS)模式或电控双折射(ECB)模式来实现。当显示面板150配置为有机发光显示面板时,显示面板150根据顶部发光模式、底部发光模式或双发光模式来实现。
当显示面板150基于从供电单元180输出的电压以及从扫描驱动器130和数据驱动器140输出的扫描信号和数据信号DATA发光或者使得光能够通过其传输时,上述显示装置显示特定图像。
在相关技术显示装置中,当从供电单元输出的电压由于负载变化而显著波动时并且当波动程度随负载的变化而变化时,会在显示面板上产生水平串扰(X-talk)。具体地,当每子像素形成大量薄膜晶体管(TFT)时,与有机发光二极管(OLED)类似,更难预测显示面板中产生的水平串扰量。
在相关技术中,为了解决上述问题,已经提出了给供电单元的输出端子添加输出电容器的方案。然而,所提出的方案只能通过使用负载电容器来缓解上述问题,但不能从根源上完全消除该问题。另外,由于添加负载电容器,所提出的方案造成成本增加,并且此外,根据负载的设计方案(显示面板的类型/大小等),该方案的效果不明显。
在下文中,将描述用于改进上述问题的设备和方法。
图3是示出根据本公开第一实施方案的装置的一部分的配置的视图,图4是示出根据本公开第二实施方案的装置的一部分的配置的视图,图5是示出根据常规提出的方案的负载电流与电源之间的关系的波形图,以及图6是示出根据实施方案的负载电流与电源之间的关系的波形图。
如图3所示,在本公开的第一实施方案中,定时控制器120和供电单元180彼此交互工作。供电单元180基于从定时控制器120输出的数据信号DATA和同步信号Sync来改变从供电单元180输出的电压Vout。
具体地,供电单元180从定时控制器120预先接收装置信息DATA和Sync,并且基于所接收的装置信息DATA和Sync提前分析并预测要从供电单元180输出的电压Vout的变化量。为了减小由于负载变化而导致的瞬态电压量,在负载变化之前,供电单元180基于所预测的电压变化量来改变输出电压Vout。
供电单元180包括电流量分析单元181、变化量确定单元183和输出电压改变单元185。供电单元180还可以包括其他电路块(通信接口、控制电路等),但是这些电路与本公开的本质无关,因此被省略。
基于从定时控制器120提供的数据信号DATA,电流量分析单元181根据数据信号DATA分析并预测输出电流量。电流量分析单元181根据该输出电流量分析并预测输出电压的瞬态电流量。电流量分析单元181将所分析和预测的输出电压的瞬态电流量递送至变化量确定单元183。
基于从电流量分析单元181递送的输出电压的瞬态电流量,变化量确定单元183根据该瞬态电流量确定输出电压的变化量。变化量确定单元183可以以诸如查找表等的数据的形式根据瞬态电流量来配置输出电压的变化量,根据预定值,可以从查找表提取并输出根据瞬态电流量的输出电压的变化量。变化量确定单元183将所提取的输出电压的变化量递送至输出电压改变单元185。
基于从定时控制器120提供的数据信号DATA和同步信号Sync以及从变化量确定单元183递送的输出电压的变化量,输出电压改变单元185限定瞬态电流产生段(或产生时间点)。在瞬态电压产生之前(或者在负载变化之前),输出电压改变单元185基于瞬态电流产生段来改变供电单元180的输出电压Vout。
如图4所示,在本公开的第二实施方案中,数据驱动器140和供电单元180彼此交互工作。供电单元180基于从数据驱动器140提供的数据信号DATA和数据定时控制信号DDC来改变从该供电单元180输出的电压Vout。
具体地,供电单元180从数据驱动器140预先接收装置信息DATA和DDC并且基于所接收的装置信息DATA和DDC提前分析并预测要从供电单元180输出的电压Vout的变化量。为了减小由于负载变化而导致的瞬态电压量,在负载变化之前,供电单元180基于所预测的电压的变化量来改变输出电压Vout。
数据定时控制信号DDC包括源起始脉冲(SSP)、源采样时钟(SSC)、极性控制信号POL、源输出使能信号SOE等。源起始脉冲是用于对数据驱动器140的数据采样起始点进行控制的信号。源采样时钟是用于相对于上升沿或下降沿对数据驱动器140内的数据的采样操作进行控制的信号。极性控制信号是用于对数据电压的极性进行控制的信号。源输出使能信号是用于对数据驱动器140的输出进行控制的信号。
从数据驱动器140输出的数据定时控制信号DDC还可以包括能够检测其中负载被从定时控制器120输出的同步信号Sync所改变的段的信号(或者能够使电力的输出点同步的信号)。在下文中,在从数据驱动器140输出的信号中,将数据定时控制信号DDC描述为能够识别负载变化的段的信号的实例。然而,能够检测负载变化的段的信号的名称或定义可以随装置而变化。
供电单元180包括电流量分析单元181、变化量确定单元183和输出电压改变单元185。供电单元180还可以包括其他电路块(通信接口、控制电路等),但是这些电路与本公开的本质无关,因此被省略。
基于从数据驱动器140提供的数据信号DATA,电流量分析单元181根据数据信号DATA分析并预测输出电流量。电流量分析单元181根据该输出电流量分析并预测输出电压的瞬态电流量。电流量分析单元181将所分析和预测的输出电压的瞬态电流量递送至变化量确定单元183。
基于从电流量分析单元181递送的输出电压的瞬态电流量,变化量确定单元183根据瞬态电流量确定输出电压的变化量。变化量确定单元183可以以诸如查找表等的数据的形式根据瞬态电流量来配置输出电压的变化量,根据预定值,可以根据瞬态电流量从查找表提取并输出输出电压的变化量。变化量确定单元183将所提取的输出电压的变化量递送至输出电压改变单元185。
基于从数据驱动器140提供的数据信号DATA和数据定时控制信号DDC以及从变化量确定单元183递送的输出电压的变化量,输出电压改变单元185限定瞬态电流产生段。在瞬态电压产生之前(或者在负载变化之前),输出电压改变单元185基于该瞬态电流产生段来改变供电单元180的输出电压Vout。
同时,为了改变输出电压Vout,还可以使用下述方法:改变被施加至存在于供电单元180内的DC/DC转换单元的误差放大器的参考电压Ref的输入电压。
[相关技术实例]
如图5所示,使用常规提出的方案,难以根据负载电流的变化直接改变从供电单元输出的输出电压Vout。由于这个原因,常规提出的方案具有下述问题:从供电单元输出的输出电压Vout在负载电流变化很快的段L1和段L2中波动。
例如,从供电单元输出的输出电压Vout具有与负载电流增大的第一负载段L1相对应的其电平下降ΔV的电压下降段V1,并且此后,从供电单元输出的输出电压Vout保持正常电平。在另一实例中,从供电单元输出的输出电压Vout具有与负载电流减小的第二负载段L2相对应的其电平上升ΔV的电压上升段V2,并且此后,从供电单元输出的输出电压Vout保持正常电平。
在常规提出的方案中,由于如在第一负载段L1或第二负载段L2中产生根据负载电流而变化的瞬态电流(请参考V1和V2),所以从供电单元输出的输出电压Vout根据瞬态电流的产生量形成瞬态电压ΔV×2并且从供电单元输出的输出电压Vout波动。
因此,当从供电单元输出的输出电压Vout由于负载变化而显著波动时并且当波动程度随负载的变化而变化时,在显示面板上会产生水平串扰(x-talk)。
[实施方案]
如图6所示,在根据一个实施方案的方案中,在负载电流变化之前,可以直接改变从供电单元输出的输出电压Vout。因此,根据实施方案的方案可以防止下述问题:从供电单元输出的输出电压Vout在负载电流快速变化的段L1和段L2中波动。
例如,从供电单元输出的输出电压Vout具有电压提前上升预定时间段以应对其中负载电流增大的第一负载段L1的产生的电压下降防止段PV1。由于补偿电压如电压下降防止段PV1,改进(补偿或抵消)了与第一负载段L1相对应的电压下降的电压下降段V1的下降宽度,并且此后,从供电单元输出的输出电压Vout保持正常电平。
在另一实例中,从供电单元输出的输出电压Vout具有在预定时间段期间电压提前下降以应对负载电流减小的第二负载段L2的产生的电压上升防止段PV2。由于补偿电压如电压上升防止段PV2,改进(补偿或抵消)了与第二负载段L2相对应的电压上升的电压上升段V2的上升宽度,并且此后,从供电单元输出的输出电压Vout保持正常电平。
在根据实施方案的方案中,甚至当由于负载电流像第一负载段L1或第二负载段L2一样变化而产生瞬态电流(请参考V1和V2)时,从供电单元输出的输出电压Vout预先被补偿和抵消。因此,与常规提出的方案相比,根据实施方案的方案可以降低瞬态电压的产生量(ΔV)。
以这种方式,在根据实施方案的方案中,在负载变化之前,执行下述补偿操作:将用于抵消负载变化的电压临时施加于供电单元的输出端子。当通过补偿操作根据负载变化改进或补偿由于负载变化而导致的从供电单元输出的输出电压Vout的变化量时,可以解决或改进显示面板中产生的水平串扰(x-talk)。
同时,对于上述问题,当每子像素形成大量薄膜晶体管(TFT)时,与有机发光二极管(OLED)类似,更难预测显示面板中产生的水平串扰量。此外,当所述问题出现在小型显示装置(例如,移动装置或智能电话)中时,在显示面板上出现水平串扰或异常屏幕的问题加剧。因此,当应用于具有下文中描述的配置的小型显示装置时,本公开更有效。
图7是示意性示出采用本公开第一实施方案的小型有机发光显示装置的视图。尚未被描述但是在下文中要描述的小型有机发光显示装置还可以应用于第二实施方案。
如图7所示,小型有机发光显示装置可以包括定时控制器120、扫描驱动器130、数据驱动器140和供电单元180。为了帮助理解本公开,对于显示面板,将描述单个子像素(SP)。
在小型有机发光显示装置中,扫描驱动器130和数据驱动器140基于从供电单元180输出的第一源电压VDD进行操作。具体地,扫描驱动器130使用从供电单元180输出的第一源电压VDD产生与栅极高电压VGH和栅极低电压VGL相对应的扫描信号。
数据驱动器140使用从供电单元180输出的第一源电压VDD作为设置在数据驱动器140内部或外部的伽马单元GMA的参考电压,并且根据伽马参考电压将模拟数据信号转换成数字数据信号DATA,并且输出经转换的数据信号。
通过扫描线GL1将与从扫描驱动器130输出的栅极高电压VGH和栅极低电压VGL相对应的扫描信号提供给子像素SP的第一晶体管T1。通过数据线DL1和第一晶体管T1将从数据驱动器140输出的数据信号DATA存储为电容器Cst中的数据电压。
第二晶体管T2根据在电容器Cst中存储的数据电压产生驱动电流,OLED响应于流经第一源电压线VDD和低电位电压线GND的驱动电流而发光。
由于小型有机发光显示装置的上述配置,与栅极高电压VGH和栅极低电压VGL相对应的扫描信号根据1个水平周期H周期性地引起负载变化。此外,在数据信号DATA的情况下,显示面板内的电容器Cst中所充的电荷量(数据电压)随水平周期而变化。即,充电负载可以包括显示面板的扫描线和数据线。原因在于:可以根据1个水平周期很快地改变被提供给扫描驱动器130和数据驱动器140的第一源电压VDD(从供电单元输出的电压)。
在此,如在常规提出的方案中,当供电单元的输出电压随着负载的变化而相当大地波动(变化)时,还影响以来自供电单元的输出电压操作的驱动器130和驱动器140。因此,在根据常规提出的方案实现小型有机发光显示装置的情况下,下述问题可能加剧:在显示面板上出现水平串扰或异常屏幕。
同时,在采用本公开的第一实施方案的小型有机发光显示装置中,供电单元180响应于从定时控制器120输出的信号(DATA和Sync)执行补偿操作。
如上面所讨论的,在负载变化之前,供电单元180执行与负载的变化的相对应的、改变输出电压Vout的补偿操作。因此,当根据第一实施方案的方案来实现小型有机发光显示装置时,可以改进或避免在显示面板上出现水平串扰或异常屏幕的问题。
在下文中,将描述用于驱动根据本公开的实施方案的显示装置的方法。
图8是示出用于驱动根据本公开的实施方案的显示装置的方法的流程图,图9是示出根据图8的驱动方法的负载电流与电源之间的关系的波形图,以及图10是示出常规提出的方案与实施方案之间的比较的视图。
如图8至图10所示,在用于驱动根据本公开的实施方案的显示装置的方法中,在负载电流变化之前,直接改变从供电单元输出的输出电压。在下文中将描述其驱动方法的流程。
首先,根据数据信号分析输出电流量(S110)。供电单元根据基于从定时控制器或数据驱动器提供的数据信号的输出电流量来分析并预测输出电压的瞬态电流量。这可以由包括在供电单元中的电流量分析单元来执行,但是本公开不限于此。
接下来,根据输出电流量来分析输出电压的瞬态电流量(S120)。供电单元基于输出电流量来分析输出电压的瞬态电流量。这可以由包括在供电单元中的电流量分析单元来执行,但是本公开不限于此。
此后,根据瞬态电流量来确定输出电压的变化(S130)。供电单元基于瞬态电流量来确定根据瞬态电流量的输出电压的变化。这可以由包括在供电单元中的变化确定单元来执行,但是本公开不限于此。
此后,基于同步信号来限定瞬态电流产生段(S140)。供电单元基于从定时控制器(或数据驱动器)提供的同步信号(或控制信号)以及输出电压的变化来限定瞬态电流产生段(或产生时间)。这可以由包括在供电单元中的输出电压改变单元来执行,但是本公开不限于此。
此后,在瞬态电流产生之前,改变供电单元的输出电压(S150)。在瞬态电流产生之前,供电单元基于从定时控制器(或数据驱动器)提供的同步信号(或控制信号)来改变供电单元的输出电压。
根据上述驱动方案如下改变从供电单元输出的输出电压。
例如,从供电单元输出的输出电压Vout具有电压提前上升预定时间段以处理负载电流增大的第一负载段L1的产生的电压下降防止段PV1(或者上升补偿电压施加段)。由于补偿电压如电压下降防止段PV1,所以改进(补偿或抵消)了电压下降以与第一负载段L1相对应的电压下降段V1的下降宽度,并且此后,从供电单元输出的输出电压Vout保持正常电平。
在另一实例中,从供电单元输出的输出电压Vout具有在预定时间段期间电压提前下降以应对负载电流(或瞬态电流)减小的第二负载段L2的产生的电压上升防止段PV2(或者下降补偿电压施加段)。由于补偿电压如电压上升防止段PV2,所以改进(补偿或抵消)了与第二负载段L2相对应的、电压上升的电压上升段V2的上升宽度,并且此后,从供电单元输出的输出电压Vout保持正常电平。
在根据实施方案的方案中,甚至当由于负载电流像第一负载段L1或第二负载段L2一样变化而产生瞬态电流(请参考V1和V2)时,从供电单元输出的输出电压Vout预先被补偿和抵消。因此,与常规提出的方案相比,根据实施方案的方案可以降低瞬态电流的产生量(ΔV)。
在常规提出的方案中,如图10的(a)所示,当负载电流变化(很快)时,在显示面板150上出现水平串扰(x-talk)或异常屏幕(DSP1和DSP2之间的亮度差异或闪烁)。
相比之下,如图10的(b)所示,在根据实施方案的方案中,虽然负载电流变化(很快),但是解决了在显示面板150上出现水平串扰(x-talk)或异常屏幕(DSP1和DSP2之间的亮度差异或闪烁)的问题。
如上所述,根据本公开的实施方案,通过减小由于负载变化而导致的电压波动来改进电压的瞬态电流特征,从而提高显示质量。此外,由于本公开有利于改进水平串扰(x-talk),所以可以减小为了改进水平串扰(x-talk)而添加的电路块(DC/DC转换单元)的输出电容器的电容,从而降低制造成本。

Claims (7)

1.一种显示装置,包括:
显示面板,所述显示面板配置为显示图像;
驱动器,所述驱动器包括配置为驱动所述显示面板的数据驱动器和扫描驱动器;
供电单元,所述供电单元配置为向所述驱动器提供电压;以及
定时控制器,所述定时控制器配置为控制所述驱动器,
其中所述供电单元在负载变化之前执行补偿操作以改变从所述供电单元输出的输出电压以对应于所述负载的变化,
其中所述供电单元在其中负载电流增大的第一负载段产生之前施加用于防止电压下降的上升补偿电压,以及在其中所述负载电流减小的第二负载段产生之前执行补偿操作以施加用于防止电压上升的下降补偿电压;
其中所述供电单元基于从所述定时控制器提供的数据信号和同步信号在负载变化之前执行补偿操作以改变从所述供电单元输出的输出电压以对应于所述负载的变化。
2.一种显示装置,包括:
显示面板,所述显示面板配置为显示图像;
驱动器,所述驱动器包括配置为驱动所述显示面板的数据驱动器和扫描驱动器;
供电单元,所述供电单元配置为向所述驱动器提供电压;以及
定时控制器,所述定时控制器配置为控制所述驱动器,
其中所述供电单元在负载变化之前执行补偿操作以改变从所述供电单元输出的输出电压以对应于所述负载的变化,
其中所述供电单元在其中负载电流增大的第一负载段产生之前施加用于防止电压下降的上升补偿电压,以及在其中所述负载电流减小的第二负载段产生之前执行补偿操作以施加用于防止电压上升的下降补偿电压;
其中所述供电单元基于从所述数据驱动器提供的数据信号和控制信号在负载变化之前执行补偿操作以改变从所述供电单元输出的输出电压以对应于所述负载的变化。
3.根据权利要求1或2所述的显示装置,其中所述供电单元在负载变化之前向所述供电单元的输出端子临时施加用于抵消所述负载的变化的电压。
4.根据权利要求1或2所述的显示装置,其中所述供电单元包括:
电流量分析单元,所述电流量分析单元配置为根据从外部提供的数据信号来分析和预测输出电流量;
变化确定单元,所述变化确定单元配置为根据从所述电流量分析单元递送的输出电压的瞬态电流量来确定所述输出电压的变化;以及
输出电压改变单元,所述输出电压改变单元配置为基于从外部提供的数据信号和同步信号、与所述同步信号对应的控制信号、以及从所述变化确定单元递送的输出电压的变化来限定瞬态电流产生段,并且在负载变化之前改变从所述输出电压改变单元输出的输出电压以对应于所述负载的变化。
5.根据权利要求4所述的显示装置,其中所述输出电压改变单元包括查找表,所述查找表用于根据从所述电流量分析单元递送的输出电压的所述瞬态电流量来提取和输出所述输出电压的变化以对应于预定值。
6.一种用于驱动显示装置的方法,所述方法包括:
根据数据信号分析并预测输出电流量;
根据所述输出电流量分析输出电压的瞬态电流量;
根据所述瞬态电流量确定所述输出电压的变化;
基于所述输出电压的变化、同步信号、以及与所述同步信号对应的控制信号来限定瞬态电流产生段;以及
在瞬态电流产生之前改变供电单元的输出电压,
其中在所述输出电压的改变中,执行补偿操作以在其中所述瞬态电流增大的第一负载段产生之前施加用于防止电压下降的上升补偿电压,以及在其中所述瞬态电流减小的第二负载段产生之前施加用于防止电压上升的下降补偿电压。
7.根据权利要求6所述的方法,其中
在所述输出电压的改变中,
在所述瞬态电流产生之前向所述供电单元的输出端子临时施加用于抵消所述瞬态电流量的电压。
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