CN100345035C - 图像显示装置 - Google Patents

图像显示装置 Download PDF

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CN100345035C
CN100345035C CNB2005100081866A CN200510008186A CN100345035C CN 100345035 C CN100345035 C CN 100345035C CN B2005100081866 A CNB2005100081866 A CN B2005100081866A CN 200510008186 A CN200510008186 A CN 200510008186A CN 100345035 C CN100345035 C CN 100345035C
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CN1661429A (zh
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上村一弘
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JVCKenwood Corp
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Victor Company of Japan Ltd
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    • 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
    • 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
    • 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
    • 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
    • G09G3/22—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
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/36—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory
    • G09G5/39—Control of the bit-mapped memory
    • G09G5/395—Arrangements specially adapted for transferring the contents of the bit-mapped memory to the screen
    • G09G5/397—Arrangements specially adapted for transferring the contents of two or more bit-mapped memories to the screen simultaneously, e.g. for mixing or overlay
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0257—Reduction of after-image effects
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
    • G09G2340/0435—Change or adaptation of the frame rate of the video stream

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Abstract

提供一种图像显示装置，使可以进行无闪烁显示的保持型显示的优点不丧失，极力抑制亮度的降低，但却可以减少动画模糊。图像显示装置采用具有排列成矩阵形的多个像素、并使电信号在各个像素上保持规定时间进行显示的有源矩阵型显示屏，包括：帧率变换电路，对具有第1帧频率的第1视频信号进行帧率变换，输出具有比第1帧频率更高频率的第2帧频率的第2视频信号；及驱动电路，将第2视频信号在有源矩阵型显示屏上显示；上述帧率变换电路包括：插补帧生成机构，采用第1视频信号中的多个帧，生成插补帧信号；乘法机构，对插补帧信号乘以大于0小于1的系数；插入机构，将由乘法机构乘以系数的补插帧信号插入第1视频信号，生成第2视频信号。

Description

图像显示装置
技术领域
本发明涉及液晶显示装置及有机场致发光显示装置所代表的保持型图像显示装置，是关于可以降低动态图像的模糊感的图像显示装置。
背景技术
在图像显示装置中具有：像采用阴极射线管(CRT)的显示装置那样在图像写入的瞬间强烈发光的脉冲型显示装置、及在每个像素上具有存储功能的有源矩阵型显示装置这样的从写入图像到写入下一帧图像期间保持显示的保持型显示装置。有源矩阵型显示装置有采用薄膜晶体管(TFT)的液晶显示装置。在液晶显示装置中，通过对每个像素所配置的TFT和电容器使像素中写入的图像保持一定时间。
保持型显示装置的缺点之一是在动态图像上产生模糊感(以下称动画模糊)。现有的液晶显示装置的动画模糊是由液晶的响应速度引起的，但是无论将液晶的响应速度如何提高，保持显示本身所引起的动画模糊也不能解决。该问题及其解决方法在下述的非专利文献1中有所记载。动画模糊不只在液晶显示装置，而且在有机场致发光显示装置的有源矩阵型时也同样产生。在非专利文献1中作为动画模糊的解决方法，记载了缩短保持时间，接近于脉冲型显示的方法。
(非专利文献1)栗木泰市郎，“液晶显示器上产生的原理性动画品质恶化及其改善方法”，信学技报EID2000-47(2000-09)，P.13-18在上述非专利文献1中记载的方法中，存在的缺点是需要有与视频信号同步将背照灯遮光的装置，使作为保持型显示优点的无闪烁显示完全丧失。另外还存在由于显示元件发光的时间变短而使画面整体的亮度下降的缺点。
发明内容
本发明鉴于这样的问题，其目的在于提供一种图像显示装置，使可以进行无闪烁显示的保持型显示的优点不丧失，极力抑制亮度的降低，但却可以减少动画模糊。
本发明为了解决上述现有技术的课题，提供一种图像显示装置，采用具有排列成矩阵形的多个像素、并使电信号在各个像素上保持规定时间进行显示的有源矩阵型显示屏，其特征在于，包括：
帧率(frame-rate)变换电路，对具有第1帧频率的第1视频信号进行帧率变换，输出具有比上述第1帧频率更高频率的第2帧频率的第2视频信号；及
驱动电路，将上述第2视频信号在上述有源矩阵型显示屏上显示；
上述帧率变换电路包括：
插补帧生成机构，采用上述第1视频信号中的多个帧，生成插补帧信号；
乘法机构，对上述插补帧信号乘以大于0小于1的系数；
插入机构，将由上述乘法机构乘以上述系数的补插帧信号插入上述第1视频信号，生成第2视频信号。
根据本发明，使可以进行无闪烁显示的保持型显示的优点不丧失，极力抑制亮度的降低，可是却可以减少动画模糊。另外，由于不需要将背照灯遮光等的特殊电路，所以成本增加不大。
附图说明
图1是表示本发明的一实施例的方框图，
图2是表示图1中帧率变换电路1具体构成例的方框图，
图3是为说明图1中帧率变换电路1工作的图，
图4是为说明一实施例作用的图。
具体实施方式
下面，参照附图对本发明的图像显示装置进行说明。图1是表示本发明的图像显示装置一实施例的方框图，图2是表示图1中帧率变换电路1具体构成例的方框图，图3是为说明图1中帧率变换电路1工作的图，图4是为说明一实施例作用的图。
在图1中，对帧率变换电路1输入帧频率为60Hz的依次扫描信号的视频信号。帧率变换电路1将输入视频信号的帧频率变换成2倍即120Hz后输出。本发明的图像显示装置的特点在于帧率变换电路1中的帧率变换方法，对此将在后面叙述。帧频率为120Hz的视频信号输入到驱动电路2，驱动电路2驱动作为保持型显示装置(显示屏)一例的液晶屏3，显示帧频率为120Hz的视频信号。显示屏并不限于液晶屏，只要是具有排列成矩阵形的多个像素，使电信号在每个像素上保持规定时间进行显示的有源矩阵型显示屏即可。
帧率变换电路1的一例如图2所示的构成。在图2中，帧频率为60Hz的视频信号输入到图像存储器11。图像存储器11至少具有可存储1帧量图像数据的容量，此处包括分别可存储1帧量图像数据的存储器11a、11b。在存储器11a、11b中以写入频率为60Hz分别写入1帧量的图像数据，同时以输入视频信号的2倍速度的读出频率为120Hz进行读出。从图像存储器11读出的图像数据输入到中间值检测电路12及插入电路15。
中间值检测电路12对所输入的相邻2帧的各像素上的中间值(此处为中央值)进行检测。例如，如果从存储器11a读出的帧的某像素位置上的像素值为200，而从存储器11b读出的帧在该像素位置上的像素值为100，则中间值为150。
从中间值检测电路12输出的中间值信号输入到乘法器13。乘法器13对所输入的中间值信号，例如乘以1/2的系数。1/2是所希望的系数一例，但是系数只要是小于1大于0的数即可。乘法器13的输出输入到限幅器14，进行规定的限幅。限幅器14的输出输入到插入电路13。插入电路13对从图像存储器11读出的2帧量的图像数据，插入从限幅器14输出的图像数据，作为帧频率为120Hz的视频信号输出。
在此采用图3及图4再对帧率变换电路1的工作及作用进行说明。
输入到图像存储器11的帧频率为60Hz的视频信号如图3(A)中所示，分别由多个像素构成的像素值为200的像素P200和像素值为100的P100及像素值为0的像素P0排成阶梯形波形。而且，该阶梯形波形从左向右在水平方向平行移动。这时产生图3(A)中所示宽度的动画模糊。当以横轴为时间、纵轴为像素，将该图3(A)的像素位置X上的视频信号画成曲线图时，变为图4(A)。当考虑显示元件的响应时，在视觉上具有虚线所示的特性。
图3(B)表示将背照灯遮光(シヤツタ)，缩短保持时间的情况。通过对背照灯遮光1/60秒的1/2时间，使保持时间为1/2。这时，对背照灯进行遮光的期间是与插入像素值为0的像素相同的状态。这时，动画模糊的宽度比图3(A)时窄，使动画模糊得到改善。
将图3(B)的像素位置X上的视频信号画成曲线图时，变成图4(B)。如图4(B)中所示，虽然接近脉冲型的显示，但是由于相邻的帧间像素值差很大，所以可认为是画面的闪烁。另外，从虚线表示的特性可知，画面整体的亮度降低了。
图3(C)表示本实施例的显示状态。如上所述，在本实施例中，由于对由中间值检测电路12所检测的中间值信号，插入由乘法器13乘以1/2的系数的视频信号，所以如图所示，例如在从像素值100的像素P100向像素值200的像素P200进行时间性变化的部分，插入像素值75的像素P75，而在从像素值0的像素P0向像素值100的像素P100进行时间性变化的部分，插入像素值25的像素P25。这时，动画模糊的宽度比图3(A)还要窄，动画模糊得到了改善。
当将图3(C)的像素位置X上的视频信号画成曲线图，则变成图4(C)。如图4(C)所示，本实施例中，由于接近脉冲型显示，同时相邻的帧间像素值的差小，所以不认为是画面闪烁。另外，从虚线所示的特性可以看出，可抑制画面整体亮度的降低。
以上说明的本实施例，在帧率变换电路1中，由中间值检测电路12检测中间值信号，并将该中间值信号作为插补帧信号，但是插补帧信号的生成方法并不限定于此，例如也可以通过采用匹配法的移动向量检测电路生成插补帧信号。另外并不限定在相邻2帧生成插补帧信号，例如也可以从4帧等多个帧生成插补帧信号。本发明不是对生成的插补帧信号直接插入，而是在乘以规定的系数，降低像素值电平的状态进行插入，只要在不超出本发明的要点的范围内，可以进行种种变更。

Claims (1)

1.一种图像显示装置，采用具有排列成矩阵形的多个像素、并使电信号在各个像素上保持规定时间进行显示的有源矩阵型显示屏，其特征在于，包括：
帧率变换电路，对具有第1帧频率的第1视频信号进行帧率变换，输出具有比上述第1帧频率更高频率的第2帧频率的第2视频信号；及
驱动电路，将上述第2视频信号在上述有源矩阵型显示屏上显示；
上述帧率变换电路包括：
插补帧生成机构，采用上述第1视频信号中的多个帧，生成插补帧信号；
乘法机构，对上述插补帧信号乘以大于0小于1的系数；
插入机构，将由上述乘法机构乘以上述系数的插补帧信号插入上述第1视频信号，生成第2视频信号。
CNB2005100081866A 2004-02-25 2005-02-22 图像显示装置 Expired - Fee Related CN100345035C (zh)

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