CN1839425A - 用于驱动易于产生惰性的图像再现装置的系统 - Google Patents

用于驱动易于产生惰性的图像再现装置的系统 Download PDF

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CN1839425A
CN1839425A CNA200480023991XA CN200480023991A CN1839425A CN 1839425 A CN1839425 A CN 1839425A CN A200480023991X A CNA200480023991X A CN A200480023991XA CN 200480023991 A CN200480023991 A CN 200480023991A CN 1839425 A CN1839425 A CN 1839425A
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T·佐尔夫
K·埃克
M·韦布勒希特
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Koninklijke Philips NV
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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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/36—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 by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • 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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/36—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 by control of light from an independent source using liquid crystals
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    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G—PHYSICS
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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
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    • G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
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    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • 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
    • G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
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    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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Abstract

在易于产生惰性的图像再现装置，特别是液晶显示器的驱动系统中，将取决于帧与帧之间视频信号改变的校正值添加到输入视频信号中，以补偿惰性效应，并且将经校正的视频信号传输给图像再现装置，以形成校正值，提供一种以状态变量作为输出变量，以视频信号作为第一输入变量，并以前一帧的状态变量作为第二输入变量的图像再现装置的模块。此外，为了得到校正值，提供一个以输入视频信号和前一帧的状态变量作为输入变量，以经校正的视频信号作为输出变量的函数。

Description

用于驱动易于产生惰性的图像再现装置的系统
技术领域
本发明涉及一种用于驱动易于产生惰性的图像再现装置，特别是液晶显示器的系统，其中将取决于帧与帧之间视频信号改变的校正值添加到输入的视频信号中以补偿惰性效应，并且其中将经过校正的视频信号传递给图像再现装置。
背景技术
已知液晶显示器(LCD)具有令人不满意的瞬态响应。两个连续帧之间输入视频信号的突然改变不会导致LCD传递的亮度发生相应的突然改变。取而代之，液晶显示器表现出显著的惰性，所传递的亮度仅逐渐接近预定值。该过渡可能延续多个帧周期(刷新周期)。这种性质尤其导致了运动帧序列中的运动干扰，其中尤其是边缘以模糊的方式被再现。运动干扰取决于相应的当前视频信号的幅度和前一视频信号。此外，液晶显示器的亮度响应取决于具体使用的相应技术。
由于帧序列中运动物体的模糊边缘，下面也将这种效应称作运动模糊。在例如US6,304,254 B1所披露的方法中，存储各个先前的帧。将当前帧和前一帧的单个像素的值输入表中，从其中读出校正值，导致了视频信号中的突然改变的过驱动。由此确实可改善运动模糊到一阶近似。不过，该已知方法具有多个缺点。从而，例如，超出液晶显示器的放大器幅度范围的极限的过驱动是不可能的。不过，如果结果是缺少足够的过驱动，那么由于仅存储一帧，在这种突然改变之后也可以不再进行之后的校正。
US 2002/0175907 A1披露了一种包括液晶显示器的系统，其中使用液晶显示器的元件的电容值的预测来形成校正值。其利用了这样一个事实，即在无限短的时间内不能将其自身调节到特定状态的液晶，缓慢地改变各元件的电容，结果，所施加的电压也发生改变。在这种已知系统中，存储电容值作为所施加电压的函数，从而，可间接地用作将要施加的过驱动的一种措施。
发明内容
利用根据本发明的系统，改善了运动模糊，在于，为了形成校正值，提供一种图像再现装置的模块，其具有作为输出变量的状态变量，作为第一输入变量的视频信号和作为第二输入变量的来自前一帧的状态变量，以及，
而且为了导出校正值，具有以输入的视频信号和前一帧的状态变量作为输入变量、并以已校正的视频信号作出输出变量的函数。最好将该函数存储到表中。
在此情形中，状态变量是从因突然的信号改变而产生的亮度随时间变化中导出的变量的数值表示。所述变量可以例如是帧周期结束时的亮度或者帧周期上的平均亮度。
与上述的已知方法相比，根据本发明的系统具有以下优点：如果不能在单一步骤中执行校正(帧与帧之间)，则改善的过驱动不会引入系统误差。取而代之的是，在本发明的情形中，仅需要有限的动态范围，并且可以在不止一帧上获得最佳校正。此外，即使原则上可以进行单级校正，也可以容易地分布在多帧上进行校正。
由于多种原因，这种灵活性是有益的。在精度方面自然地限定了为了确定过驱动而使用液晶显示器的时间模型。如果尝试着从一帧到下一帧进行校正，则可以易于导致对运动边缘过度补偿。不过，在根据本发明的系统中，可明确地进行调整，其中校正延续到多帧，从而可消除任何过度补偿。
最后，液晶显示器的惰性性质是极其不对称的，这意味着在视频信号的上升沿与下降沿处该性质显著不同。这会导致这样的情况，即在一个步骤中，也即从一帧到下一帧，仅能对运动物体的两个相对边缘其中之一进行校正，而相对边缘需要在多帧上的校正。在边缘方法中，因此产生了不对称的干扰，而在根据本发明方法中可对所需的多帧进行校正。
与上述的已知系统相比，根据本发明的系统具有以下优点：很大程度上完全考虑了特定视频信号的亮度响应。对于种类、对于电荷或液晶显示器的样品，可预先通过度量确定亮度响应。
本发明的有利实施例在于，经校正的视频信号为该模块的第一输入变量。不过，由于校正值在每种情形中都是已知的，在另一有利实施例中还可以规定输入视频信号为第一输入变量且该模块包括校正值的导数。可按照这样一种方式来简化该实施例，即，将模块和用于导出校正值的表组合在公用表中。
最后，在另一实施例中可以规定公用表包含附加的输入视频信号和校正值。
为了使分别用于表或模块的存储器尽可能小，从而保持廉价，在根据本发明的系统中，还可以规定将输入和输出变量的插值节点存储到模块中，以及提供装置用于在插值节点之间进行插值。
附图描述
本发明的这些和其他方面是显而易见的，并且将参照下面所述的实施例进行说明。在附图中：
图1表示用于执行已知方法的系统的方框电路图，
图2表示第一示例性实施例的方框电路图，
图3表示第二示例性实施例的方框电路图，
图4表示第三示例性实施例的方框电路图，
图5表示第四示例性实施例的方框电路图。
实施例及其部件实际上称作方框电路图。不过，这不表明根据本发明的系统局限于借助与方框相应的各电路来实现。相反，可按照特别优选的借助于大规模集成电路的方式，来实现根据本发明的系统。就此而言，可使用包括适当存储器的经过适当编程的微型计算机来执行方框电路图中所示的处理步骤。
具体实施方式
根据图1的已知系统具有用于输入视频信号Vi的输入端1，视频信号Vi通过加法器2馈送到输出端3，并作为经校正的视频信号Vo从该处发送给未示出的液晶显示器。视频信号采取数字信号的形式，将相应数值赋予每个像素。对于每一帧或图像，将这些数值存储到存储器5中，同时发送以从帧存储器5读出的前一帧的值A，作为查找表(过驱动LUT)的输入变量。对于每一对A，B，后者包含校正值C。按照尽可能好地对运动模糊进行补偿这样一种方式来选择从查找表4得到的校正值C，并将其传递给加法器2。如图1中所示，除当前帧之外，在获得校正值时还仅考虑前一帧。
在根据图2所示的本发明的系统中，将视频信号Vo的校正值B+C发送给液晶显示器的模块6。该模块代表液晶显示器对各输入视频信号的亮度响应，从而表示为“响应模块”。将其输出变量S存储到帧存储器5中。除B+C之外，还使用从帧存储器5读出的前一帧的变量S’作为模块6的输入变量。这就产生一种递归结构，从而在导出校正值C时考虑多个先前的帧。类似于已经结合图1描述的变量A，将S’与值B一起发送给查找表4。
在图3所示的第二实施例中，使用包含值B和S’作为输入变量的扩展模块7。与图2中所示的实施例相比，扩展模块7考虑了校正值C，因为后者仅取决于变量B和S’。除此之外，图3所示的实施例与图2所示的实施例相同。
与图3所示的实施例相比，在图4所示的第三示例性实施例中，将用于形成校正值C的表与所述模块组合，以形成公用表8。在图5所示的第四示例性实施例中，加法器2(图4)最终设置在表9中。作为所述表的大小的一个示例，可提及的是，对于每种情形(例如R，G，B)中的一个通道，地址区为16位，字长同样为16位。8位用于输出信号，而8位用于表示变量S。帧存储器5同样具有8位大小。

Claims (7)

1.一种用于驱动易于发生惰性的图像再现装置，特别是液晶显示器的系统，其中将取决于帧与帧之间视频信号变化的校正值添加到输入视频信号中以补偿惰性效应，并且其中将经校正的视频信号传送给图像再现装置，其特征在于：
为了形成校正值，提供图像再现装置的模块(6，7，8，9)，其具有作为输出变量的状态变量，作为第一输入变量的视频信号，作为第二输入变量的来自前一帧的状态变量，以及，
而且，为了导出校正值，具有输入视频信号和前一帧的状态变量作为输入变量、并且经校正的视频信号作为输出变量的函数(4，8，9)。
2.如权利要求1所述的系统，其特征在于将所述函数存储到表中。
3.如权利要求1或2所述的系统，其特征在于经校正的视频信号是模块(6)的第一输入变量。
4.如权利要求1或2所述的系统，其特征在于输入视频信号是第一输入变量，并且所述模块(7)包括校正值的导数。
5.如权利要求1或2所述的系统，其特征在于将用于导出校正值的所述模块和表组合在公用表(8)中。
6.如权利要求5所述的系统，其特征在于，所述公用表(9)还包含附加的输入视频信号和校正值。
7.如前面任一权利要求所述的系统，其特征在于，将输入和输出变量的插值节点存储到模块(6，7，8，9)中，以及提供用于在插值节点之间进行插值的装置。
CNA200480023991XA 2003-08-22 2004-08-16 用于驱动易于产生惰性的图像再现装置的系统 Pending CN1839425A (zh)

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