CN115244611A - 显示器亮度控制装置 - Google Patents
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Abstract
本说明书公开一种具有比以往技术简化的ACL电路的显示器亮度控制装置。本说明书中的显示器亮度控制装置如果输入视频数据,则算出平均亮度Y_avg并根据平均亮度确定亮度变化量ΔY。而且,本说明书中的显示器亮度控制装置为了调节亮度,不是修改视频数据,而是可以以调节对像素中包括的发光二极管进行驱动的电流(驱动电流)的方式来调节显示器的亮度。即,本说明书中的显示器亮度控制装置不同于以往技术,不为了亮度控制而修改视频数据。
Description
技术领域
本发明涉及显示器亮度控制装置,更详细地,涉及一种对应用自动电流限制(ACL:Automatic Current Limitation)的显示器的亮度进行控制的装置。
背景技术
本申请主张基于2020年5月25日于韩国申请的专利申请第10-2020-0062424号的优先权,相应申请的说明书和附图公开的所有内容引用到本申请中。
随着电子技术的发展,智能手机、平板电脑和可穿戴设备等包括显示器的多种电子制品正在开发和普及。显示器的耗电占据电子装置全体耗电的较大部分,随着显示器的大型化趋势,显示器尺寸越大,显示器的耗电会越增加。电子装置的电池容量有限,因而正在持续进行旨在节省显示器耗电的研发。
为了节省显示器耗电,正在使用调节显示器亮度的自动电流限制(ACL:automaticcurrent limitation,以下简称“ACL”)技术。所谓ACL技术,是一种着眼于如果以人眼无法区别的程度在明亮的显示器画面中调节亮度(luminance)则可以减少不必要的耗电的技术。更具体地,在显示器中显示的1帧(frame)画面中,根据开启像素率(OPR:on pixelrate,以下简称“OPR”)计算RGB亮度的平均值。而且,当平均亮度为某种程度的亮度以上时,可以通过ACL,在眼睛难以识别的范围内降低亮度以减少不必要的耗电。此时,可以根据ACL相关参数(例:10%、15%、20%等等)确定按何种程度的比率减小亮度。
图1是基于ACL技术的亮度变化的参考图。
另一方面,根据显示器的种类而存在多种驱动方式,驱动显示器的方式大致可以分为直接驱动方式(Direct)、无源驱动方式(Passive Matrix)、有源驱动方式(ActiveMatrix)。无源驱动方式(Passive Matrix)和有源驱动方式(Active Matrix)的最大差异在于是否存在1帧期间存储信息的储能电容器(storage capacitor)或者存储器(memory)。关于具有有源驱动方式的显示器的ACL技术,有韩国公开专利公报第10-2011-0099981号(2011.09.09)。
图2是具有有源驱动方式的显示器以往ACL技术的参考图。
根据图2和所述公开专利公报[0033]~[0041]段,如果输入视频数据,则算出平均亮度Y_avg。根据平均亮度确定亮度变化量ΔY。根据确定的亮度变化量,调节所输入的视频数据并生成新视频数据。最终将新生成的视频数据输出到像素电路,输出亮度减小的画面。即,为了调节亮度,需要对原始视频数据进行加工的过程。
这种以往ACL技术需重新生成视频数据,因而电路的构成更复杂,与重新生成视频数据的时间相应地发生画面延迟效应。另外,画面的分辨率越增加,视频数据的输入周期越急剧加快,而重新生成的视频数据直接应用于像素电路,因而无法进行渐进性亮度调整,会让观众感觉到画面的不连续变化。
发明内容
技术问题
本说明书目的在于提供一种具有比以往技术简化的ACL电路的显示器亮度控制装置。
在本说明书中,不限于以上提及的课题,未提及的其他课题是普通技术人员可以从以下记载明确理解的。
技术方案
为了解决上述课题,本说明书中的显示器亮度控制装置可以包括:平均亮度计算部,所述平均亮度计算部接收构成一帧的视频数据并算出平均亮度;亮度变化量计算部,所述亮度变化量计算部在所述算出的平均亮度为预设基准亮度以上时,算出将减少的亮度变化量;及驱动电流控制部,所述驱动电流控制部根据所述亮度变化量来变化向发光二极管施加驱动电流的像素驱动电路的驱动电流量。
根据本说明书一实施例,所述平均亮度计算部可以基于开启像素率(OPR:OnPixel Rate)的平均值算出平均亮度。
根据本说明书一实施例,所述像素驱动电路可以包括:切换元件,所述切换元件连接于连接正电源与负电源之间的像素驱动线上;及发光二极管,所述发光二极管连接于所述切换元件与所述正电源之间或者所述切换元件与所述负电源之间。而且,所述驱动电流控制部可以向所述切换元件输出电压,以使所述像素驱动电路包括的切换元件根据输入的电压,在所述像素驱动线上流动的电流量呈线性变化的区间工作。
此时,所述驱动电流控制部可以包括:非反相放大器;电压放大量调节部,所述电压放大量调节部根据所述亮度变化量,调节所述非反相放大器的反相端子与接地之间的电阻值;及电压***,所述电压***接收向所述非反相放大器输出的电压,并向所述像素驱动电路包括的切换元件输出。
根据本说明书一实施例,可以还包括亮度控制部,所述亮度控制部将所述亮度变化量和用于运算的基准亮度值输出到所述驱动电流控制部。
根据本说明书一实施例,所述亮度控制部还可以将用于计算所述亮度变化量的变化比率输出到所述亮度变化量计算部。
此时,所述亮度控制部可以在根据上一帧的平均亮度算出的以前亮度变化量与根据当前帧的平均亮度算出的当前亮度变化量为预设差异值以上时,算出具有所述以前亮度变化量与所述当前亮度变化量之间的值的至少一个中间亮度变化量,将所述中间亮度变化量输出到所述亮度变化量计算部。
本说明书中的显示器亮度控制装置可以为显示装置的一个构成要素,所述显示装置包括:由多个像素按m×n排列的显示面板;扫描驱动电路,所述扫描驱动电路沿扫描线依次驱动像素驱动电路,所述像素驱动电路是连接于多条扫描线中的各条扫描线的像素中所包括的像素驱动电路,所述多条扫描线连接于所述多个像素中沿行方向排列的像素;及数据驱动电路,所述数据驱动电路通过连接于所述多个像素中的沿纵向排列的像素的多条数据线,向连接于各数据线的各个像素输出视频数据。此时,所述显示器亮度控制装置接收的视频数据与所述数据驱动电路向各像素输出的视频数据为相同的数据。
本发明的其他具体事项包括于详细说明和附图中。
发明效果
根据本说明书一个方面,相比以往技术,ACL电路的构成简单,可以提高生产率并减小耗电量。
根据本说明书另一方面,可以进行渐进性亮度调整,可以实现自然的画面变化。
本发明的效果不限于以上提及的效果,未提及的其他效果是普通技术人员可以从以下记载明确理解的。
附图说明
图1是基于ACL技术的亮度变化的参考图。
图2是具有有源驱动方式的显示器的以往ACL技术的参考图。
图3是本说明书中的显示器亮度控制装置的工作参考图。
图4是简要示出本说明书中的显示器亮度控制装置的构成的框图。
图5是简要示出显示装置的构成的框图。
具体实施方式
如果参照后面与附图一同详细记述的实施例,本说明书中公开的发明的优点、特征以及达成其的方法将会明确。但是,本说明书不限于以下公开的实施例,可以以互不相同的多种形态体现,本实施例只提供用于使本说明书的公开更完整,向本说明书所属技术领域的技术人员(以下称为“从业人员”)完整地告知本说明书的范畴,本说明书的权利范围仅由权利要求书的范围定义。
本说明书中使用的术语用于描述实施例,并非要限制本说明书的权利范围。在本说明书中,只要在语句中未特别提及,单数型也包括复数型。说明书中使用的“包括(comprises)”及/或“包括的(comprising)”,不排除在提及的构成要素之外存在或添加一个以上的其他构成要素。
在通篇说明书中,相同的附图标记指称相同的构成要素,“及/或”包括提及的各个构成要素及一个以上的所有组合。虽然为了叙述多种构成要素而使用了“第一”“第二”等,但这些构成要素当然不由这些术语所限定。这些术语只用于将一个构成要素区别于其他构成要素。因此,下面提及的第一构成要素在本发明的技术思想内,当然也可以是第二构成要素。
如果没有不同的定义,本说明书中使用的所有术语(包括技术及科学术语)可以用作本说明书所属技术领域的技术人员可以共同理解的意义。另外,一般使用的字典定义的术语,只要未明确地特别定义,不得过于或过度地解释。下面参照附图描述本发明的实施例。
图3是本说明书中的显示器亮度控制装置的工作参考图。
将图3与图2对比来看,如果输入视频数据,则算出平均亮度Y_avg并根据平均亮度确定亮度变化量ΔY的过程相同。不过,不同于以往技术,本说明书中的显示器亮度控制装置为了调节亮度,不是修改视频数据,而是可以以调节对像素中所包括的发光二极管进行驱动的电流(驱动电流)的方式来调节显示器的亮度。即,本说明书中的显示器亮度控制装置不同于以往技术,不为了亮度控制而修改视频数据。
图4是简要示出本说明书中的显示器亮度控制装置的构成的框图。
参照图4,本说明书中的显示器亮度控制装置100可以包括平均亮度计算部110、亮度变化量计算部120和驱动电流控制部130。
所述平均亮度计算部110可以接收构成一帧的视频数据并算出平均亮度。根据本说明书一实施例,所述平均亮度计算部110可以基于开启像素率(OPR:On Pixel Rate)的平均值算出平均亮度Y_avg。在图4所示的示例中,示出了RGB数据分别为8位的示例,但本说明书不限于附图示出的示例。
所述亮度变化量计算部120在所述算出的平均亮度为预设基准亮度以上时,可以算出将减少的亮度变化量ΔY。就ACL算出亮度变化量ΔY的过程是本行业技术人员公知的技术,因而不再赘述。另外,所述基准亮度量可以多样地设置,这是不言而喻的。
所述驱动电流控制部130可以根据所述亮度变化量来变化向发光二极管施加驱动电流的像素驱动电路的驱动电流量。通常,像素驱动电路在连接正电源(+)及负电源(-、GND)之间的像素驱动线上连接有切换元件(例:晶体管)。而且,在所述切换元件与所述正电源之间或者所述切换元件与所述负电源之间连接有发光二极管LED。因此,当所述切换元件打开(turn on)时,驱动电流施加于所述发光二极管,发光二极管会打开(turn on)。另一方面,所述像素驱动电路中包括的切换元件例如为场效应晶体管(FET:field-effecttransistor)时,根据施加于栅极(gate)端子的电压大小,存在流入漏极(drain)端子与源极(source)端子之间的电流量呈线性变化的区间和与电压大小无关而流入既定电流量的饱和区间。所述驱动电流控制部130可以向所述切换元件输出电压,以使所述切换元件在线性区间工作。
根据本说明书一实施例,所述驱动电流控制部130可以包括:非反相放大器(non-converting amplifier)131;电压放大量调节部132,所述电压放大量调节部132根据所述亮度变化量来调节所述非反相放大器131的反相端子(-)与接地之间的电阻值R1;及电压***(voltage follower)133,所述电压***133接收向所述非反相放大器131输出的电压,并向所述像素驱动电路包括的切换元件输出。作为参考,图4所示的“BGR”作为“BandGap Reference,带隙基准”,发挥将既定电压输入到所述非反相放大器131的非反相端子(+)的作用。
另一方面,本说明书中的显示器亮度控制装置100可以还包括亮度控制部140。
所述亮度控制部140可以向所述驱动电流控制部130,更具体地,向电压放大量调节部132输出所述亮度变化量和用于运算的基准亮度值。所述基准亮度值是指不应用ACL时画面中输出的亮度。
所述亮度控制部140可以向所述亮度变化量计算部120输出用于计算所述亮度变化量的变化比率。所述变化比率是指从基准亮度减小的程度,可以多样地设置,例如1%、3%、5%、10%、15%等,也可以在显示器工作期间变更。所述亮度控制部140将与所述变化比率相关的值输出到所述亮度变化量计算部120,所述亮度变化量计算部120根据变更的变化比率来算出亮度变化量。
另一方面,本说明书中的显示器亮度控制装置100考虑帧的平均亮度来减小亮度,当上一帧与当前帧的亮度差异较大时,会出现急剧的亮度变化。此时,对观众而言,反而因亮度变化导致画面连续性下降,因而需要弥补。
为此,所述亮度控制部140在根据上一帧的平均亮度算出的以前亮度变化量与根据当前帧的平均亮度算出的当前亮度变化量为预设差异值以上时,可以算出具有所述以前亮度变化量与所述当前亮度变化量之间的值的至少一个中间亮度变化量,将所述中间亮度变化量输出到所述亮度变化量计算部120。
图5是简要示出显示装置的构成的框图。
参照图5,显示装置10可以包括显示面板11、扫描驱动电路12、数据驱动电路13和处理器14。
所述显示面板11可以包括多个像素(pixel)PX。所述多个像素PX可以由m×n(m、n为自然数)个排列成矩阵(matrix)形态。不过,所述多个像素排列的图案可以根据实施例而排列成多种图案,如Z字形等。
显示面板110可以以LCD(liquid crystal display)、LED(light emittingdiode)显示器、OLED(organic LED)显示器、AMOLED(active-matrix OLED)显示器、ECD(Electrochromic Display)、DMD(Digital Mirror Device)、AMD(Actuated MirrorDevice)、GLV(Grating Light Valve)、PDP(Plasma Display Panel)、ELD(ElectroLuminescent Display)、VFD(Vacuum Fluorescent Display)中的一种实现,可以以此外其他种类的平板显示器或者柔性显示器实现。在本说明书中,作为一例,将描述LED显示面板。
各个像素PX可以包括多个发光元件。发光元件可以为发光二极管LED。发光二极管可以为具有80um以下大小的微型LED(Micro LED)。一个像素PX可以通过具有互不相同颜色的多个发光元件输出多种颜色。作为一个示例,一个像素PX可以包括由红色、绿色、蓝色构成的发光元件。作为另一示例,还可以包括白色发光元件,白色发光元件也可以替代红色、绿色、蓝色发光元件中任一个发光元件。将一个像素PX中包括的各发光元件称为“子像素(sub pixel)”。
各个像素PX可以包括驱动多个子像素的像素驱动电路。所述像素驱动电路可以根据所述扫描驱动电路12和/或数据驱动电路13输出的控制信号,驱动子像素的启动或者关闭动作。所述像素驱动电路可以包括至少一个薄膜晶体管和至少一个电容器等。所述像素驱动电路可以在半导体晶片上由层叠结构实现。
所述显示面板110可以包括按行(raw)方向排列的扫描线SL1~SLm和按列(column)方向排列的数据线DL1~DLn。像素PX可以位于所述扫描线SL1~SLm与数据线DL1~DLn的交叉点。各像素PX可以与任一条扫描线SLk和任一条数据线DLk连接。所述扫描线SL1~SLm可以连接于所述扫描驱动电路120,所述数据线DL1~DLn可以连接于所述数据驱动电路130。
所述扫描驱动电路12可以配置成使所述扫描线SL1~SLm中任一条线上连接的像素驱动。优选地,所述扫描驱动电路12可以依次选择所述扫描线SL1~SLm。例如,在第一扫描驱动期间,连接于第一扫描线SL1的像素可以驱动,在第二扫描驱动期间,连接于第二扫描线SL2的像素可以驱动。
所述数据驱动电路13可以通过所述数据线DL1~DLn向各像素输出灰阶(gradation)电压。一条数据线在纵向上可以与多个像素连接,但在所述一个扫描驱动期间,只有与被扫描驱动电路12选择的扫描线连接的像素可以驱动。因此,所述数据驱动电路13可以在所述扫描驱动期间,向与一条扫描线相应的像素,通过所述数据线DL1~DLn输出灰阶(gradation)电压。另一方面,当是在像素中内置存储器单元以取代电容器的显示器(MIP:Memory In Pixel)时,可以取代所述灰阶电压而输出与灰阶相关的数据。
所述处理器14可以输出控制信号以便运行上述扫描驱动电路12和数据驱动电路13的动作。所述控制部14可以将与一个图像帧相应的图像数据所对应的控制信号分别输出给所述扫描驱动电路12和数据驱动电路13。
本说明书中的显示器亮度控制装置100可以成为所述处理器14的一个构成要素。此时,所述显示器亮度控制装置接收的视频数据与所述数据驱动电路13向各像素输出的视频数据为相同的数据。换句话说,本说明书中的显示器亮度控制装置100不修改原始视频数据,因而与以往技术相比,电路的构成会更简单,由于电路构成简单,因而可以提高处理速度。
包括所述处理器14在内,本说明书中的显示器亮度控制装置100为了运算及运行多样控制逻辑,可以包括本发明所属技术领域已知的微处理器、ASIC(application-specific integrated circuit,专用集成电路)、其他芯片集、逻辑电路、寄存器、通信调制解调器、数据处理装置等。另外,上述控制逻辑以软件实现时,所述处理器14等可以以程序模块集合实现。此时,程序模块可以存储于存储装置并由处理器运行。
为了使所述计算机读取程序并运行以程序实现的所述方法,所述计算机程序可以包括所述计算机的处理器(CPU)能够通过所述计算机装置接口读取的以C/C++、C#、JAVA、Python、机械语言等计算机语言编码的代码(Code)。这种代码可以包括用于定义运行所述方法所需功能的函数等相关功能性代码(Functional Code),可以包括使所述计算机处理器按既定步骤运行所述功能所需的运行步骤相关控制代码。另外,这种代码还可以包括,使所述计算机处理器运行所述功能所需的额外信息或介质需从所述计算机内部或者外部存储器哪个位置(地址)引用的存储器引用相关代码。另外,所述计算机的处理器为了运行所述功能而需要与远程(Remote)的某台其他计算机或服务器等通信时,代码还可以包括需如何利用所述计算机的通信模块与远程的某台其他计算机或服务器等通信、通信时需收发何种信息或介质等通信相关代码。
所述存储的介质,不是象寄存器、高速缓存、存储器等那样可短暂瞬间存储数据的介质,而是指半永久性存储数据并可由设备读取(reading)的介质。具体地,所述存储介质例如但不限于为ROM、RAM、CD-ROM、磁带、软盘、光学数据存储装置等。即,所述程序可以存储于所述计算机可访问的多种服务器上的多种记录介质或者使用者的所述计算机上的多种记录介质。另外,所述介质可以分布于以网络连接的计算机***,以分布方式存储计算机可读代码。
以上参照附图,描述了本说明书的实施例,本说明书所属技术领域的技术人员可以理解,本发明在不变更其技术思想或必需特征的情况下,可以以其他具体形态实施。因此,以上记述的实施例在所有方面应理解为只是示例性的,而非限制性的。
附图标记
100:显示器亮度控制装置
110:平均亮度计算部
120:亮度变化量计算部
130:驱动电流控制部
140:亮度控制部
Claims (8)
1.一种显示器亮度控制装置,包括:
平均亮度计算部,所述平均亮度计算部接收构成一帧的视频数据并算出平均亮度;
亮度变化量计算部,所述亮度变化量计算部在所述算出的平均亮度为预设基准亮度以上时,算出将减少的亮度变化量;及
驱动电流控制部,所述驱动电流控制部根据所述亮度变化量来变化向发光二极管施加驱动电流的像素驱动电路的驱动电流量。
2.根据权利要求1所述的显示器亮度控制装置,其特征在于,
所述平均亮度计算部基于开启像素率的平均值算出平均亮度。
3.根据权利要求1所述的显示器亮度控制装置,其特征在于,
所述像素驱动电路包括:
切换元件,所述切换元件连接于连接正电源与负电源之间的像素驱动线上;及
发光二极管,所述发光二极管连接于所述切换元件与所述正电源之间或者所述切换元件与所述负电源之间;
所述驱动电流控制部向所述切换元件输出电压,以使所述像素驱动电路包括的切换元件根据输入的电压,在所述像素驱动线上流动的电流量呈线性变化的区间工作。
4.根据权利要求3所述的显示器亮度控制装置,其中,
所述驱动电流控制部包括:
非反相放大器;
电压放大量调节部,所述电压放大量调节部根据所述亮度变化量,调节所述非反相放大器的反相端子与接地之间的电阻值;及
电压***,所述电压***接收向所述非反相放大器输出的电压,并向所述像素驱动电路包括的切换元件输出。
5.根据权利要求1所述的显示器亮度控制装置,其中,
还包括亮度控制部,所述亮度控制部将所述亮度变化量和用于运算的基准亮度值输出到所述驱动电流控制部。
6.根据权利要求5所述的显示器亮度控制装置,其特征在于,
所述亮度控制部还将用于计算所述亮度变化量的变化比率输出到所述亮度变化量计算部。
7.根据权利要求6所述的显示器亮度控制装置,其特征在于,
所述亮度控制部在根据上一帧的平均亮度算出的以前亮度变化量与根据当前帧的平均亮度算出的当前亮度变化量为预设差异值以上时,算出具有所述以前亮度变化量与所述当前亮度变化量之间的值的至少一个中间亮度变化量,将所述中间亮度变化量输出到所述亮度变化量计算部。
8.一种显示装置,包括:
根据权利要求1至权利要求7所述的显示器亮度控制装置;
由多个像素按m×n排列的显示面板;
扫描驱动电路,所述扫描驱动电路沿扫描线依次驱动像素驱动电路,所述像素驱动电路是连接于多条扫描线中的各条扫描线的像素中所包括的像素驱动电路,所述多条扫描线连接于所述多个像素中沿行方向排列的像素;及
数据驱动电路,所述数据驱动电路通过连接于所述多个像素中的沿纵向排列的像素的多条数据线,向连接于各数据线的各个像素输出视频数据;
所述显示装置的特征在于,所述显示器亮度控制装置接收的视频数据与所述数据驱动电路向各像素输出的视频数据为相同的数据。
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EP1785975A1 (en) | 2005-11-10 | 2007-05-16 | Deutsche Thomson-Brandt Gmbh | Method and apparatus for power control in a display device |
KR20100078699A (ko) * | 2008-12-30 | 2010-07-08 | 삼성전자주식회사 | 능동형 유기발광 다이오드의 전력 제어 방법 및 장치 |
KR101065321B1 (ko) | 2010-03-03 | 2011-09-16 | 삼성모바일디스플레이주식회사 | 유기전계발광 표시장치 및 그 구동방법 |
KR20130065656A (ko) | 2010-04-22 | 2013-06-19 | 퀄컴 엠이엠에스 테크놀로지스, 인크. | 내장 프로세서 및 메모리 유닛을 갖는 능동 매트릭스 픽셀 |
KR101966393B1 (ko) * | 2011-11-18 | 2019-04-08 | 삼성디스플레이 주식회사 | 표시 장치 및 그 구동 방법 |
KR102568160B1 (ko) | 2015-08-05 | 2023-08-21 | 삼성디스플레이 주식회사 | 영상 처리 장치 및 이를 포함하는 표시 장치 |
KR20170098119A (ko) | 2016-02-19 | 2017-08-29 | 삼성전자주식회사 | 전자 장치 및 전자 장치의 디스플레이 밝기 제어 방법 |
KR102545211B1 (ko) | 2018-01-10 | 2023-06-19 | 삼성전자주식회사 | 전자 장치 및 그 제어 방법 |
KR101942466B1 (ko) | 2018-06-28 | 2019-04-17 | 주식회사 사피엔반도체 | 화소 및 이를 포함하는 표시장치 |
KR102628663B1 (ko) | 2018-10-11 | 2024-01-25 | 삼성전자주식회사 | 디스플레이 장치 및 그 구동 방법 |
KR102603751B1 (ko) | 2018-11-26 | 2023-11-20 | 한화오션 주식회사 | 연료 공급 시스템 |
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2020
- 2020-05-25 KR KR1020200062424A patent/KR102289926B1/ko active IP Right Grant
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2021
- 2021-05-24 EP EP21814652.0A patent/EP4160588A4/en active Pending
- 2021-05-24 CN CN202180020666.1A patent/CN115244611A/zh active Pending
- 2021-05-24 WO PCT/KR2021/006465 patent/WO2021241970A1/ko unknown
- 2021-05-24 US US17/918,660 patent/US11990098B2/en active Active
- 2021-06-30 KR KR1020210085745A patent/KR20210145693A/ko unknown
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US11990098B2 (en) | 2024-05-21 |
EP4160588A1 (en) | 2023-04-05 |
WO2021241970A1 (ko) | 2021-12-02 |
EP4160588A4 (en) | 2024-02-21 |
KR20210145693A (ko) | 2021-12-02 |
KR102289926B1 (ko) | 2021-08-19 |
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