公开(公告)号：US20100073276A1

公开(公告)日：2010-03-25

申请号：US12490622

申请日：2009-06-24

申请人： Akira Koike ,  Kohichi Takaku ,  Yoshinori Kohno ,  Shinichi Nagashima ,  Hideto Yagisawa ,  Kodai Yamada

发明人： Akira Koike ,  Kohichi Takaku ,  Yoshinori Kohno ,  Shinichi Nagashima ,  Hideto Yagisawa ,  Kodai Yamada

IPC分类号： G09G3/36

CPC分类号： G09G3/3426 ,  G09G2320/0233 ,  G09G2320/0238 ,  G09G2320/0626 ,  G09G2330/021 ,  G09G2360/144 ,  G09G2360/16

摘要： In a video display apparatus, a backlight for illuminating a liquid crystal panel is segmented into a plurality of areas. A frequency distribution processing unit calculates a dark pixel amount from the frequency distribution of the gradation values of pixels in a video image. A backlight control unit calculates a lower limit of luminance in each area included in the backlight so that the lower limit increases as the dark pixel amount becomes smaller. The backlight control unit adjusts the luminance in each area individually according to the gradation values in each portion of the video image, and adjusts the luminance in an area where the luminance is less than the lower limit to the lower limit. The difference in luminance between the areas illuminating dark portions of the video image is decreased, and the occurrence of luminance blur resulting from the difference in luminance between the areas is reduced.

摘要翻译： 在视频显示装置中，用于照亮液晶面板的背光被分割成多个区域。 频率分布处理单元根据视频图像中的像素的灰度值的频率分布来计算暗像素量。 背光控制单元计算背光源中包含的各区域的亮度的下限，使得随着暗像素量的变小，下限增加。 背光控制单元根据视频图像的每个部分中的灰度值分别调整每个区域中的亮度，并且调整亮度低于下限的区域中的亮度。 影像的暗部的区域之间的亮度差减小，并且由各区域之间的亮度差导致的亮度模糊的发生减少。

公开(公告)号：US08373644B2

公开(公告)日：2013-02-12

申请号：US12490622

申请日：2009-06-24

申请人： Akira Koike ,  Kohichi Takaku ,  Yoshinori Kohno ,  Shinichi Nagashima ,  Hideto Yagisawa ,  Kodai Yamada

发明人： Akira Koike ,  Kohichi Takaku ,  Yoshinori Kohno ,  Shinichi Nagashima ,  Hideto Yagisawa ,  Kodai Yamada

IPC分类号： G09G3/36

CPC分类号： G09G3/3426 ,  G09G2320/0233 ,  G09G2320/0238 ,  G09G2320/0626 ,  G09G2330/021 ,  G09G2360/144 ,  G09G2360/16

摘要： In a video display apparatus, a backlight for illuminating a liquid crystal panel is segmented into a plurality of areas. A frequency distribution processing unit calculates a dark pixel amount from the frequency distribution of the gradation values of pixels in a video image. A backlight control unit calculates a lower limit of luminance in each area included in the backlight so that the lower limit increases as the dark pixel amount becomes smaller. The backlight control unit adjusts the luminance in each area individually according to the gradation values in each portion of the video image, and adjusts the luminance in an area where the luminance is less than the lower limit to the lower limit. The difference in luminance between the areas illuminating dark portions of the video image is decreased, and the occurrence of luminance blur resulting from the difference in luminance between the areas is reduced.

摘要翻译： 在视频显示装置中，用于照亮液晶面板的背光被分割成多个区域。 频率分布处理单元根据视频图像中的像素的灰度值的频率分布来计算暗像素量。 背光控制单元计算背光源中包含的各区域的亮度的下限，使得随着暗像素量的变小，下限增加。 背光控制单元根据视频图像的每个部分中的灰度值分别调整每个区域中的亮度，并且调整亮度低于下限的区域中的亮度。 影像的暗部的区域之间的亮度差减小，并且由各区域之间的亮度差导致的亮度模糊的发生减少。

公开(公告)号：US20090085862A1

公开(公告)日：2009-04-02

申请号：US12283932

申请日：2008-09-17

申请人： Kohichi Takaku ,  Tetsuo Ikeyama ,  Hideto Yagisawa

发明人： Kohichi Takaku ,  Tetsuo Ikeyama ,  Hideto Yagisawa

IPC分类号： G09G3/36

CPC分类号： G09G3/3406 ,  G09G3/3611 ,  G09G2320/0238 ,  G09G2320/0646 ,  G09G2320/0653 ,  G09G2330/021 ,  G09G2360/16

摘要： A video displaying apparatus is provided that can change light-modulation rate of a backlight source in accordance with changes in a feature quantity of an input video signal based on a difference between times required for the light adaptation and the dark adaptation.A video displaying apparatus includes a liquid crystal panel 3 that displays an input video signal, a backlight source 9 that applies light to the liquid crystal panel 3, an APL detecting part 6 that detects APL of the input video signal, and a control microcomputer 8 that variably controls a change amount of emission luminance of the backlight source 9 for each predetermined time based on the detected APL. The control microcomputer 8 performs control such that the change amount for the APL of the input video signal changing to a higher quantity becomes greater than the change amount for the APL of the input video signal changing to a lower quantity.

摘要翻译： 提供一种视频显示装置，其可以基于输入视频信号的特征量的变化，基于光适应和暗适应所需的时间差来改变背光源的调制率。 视频显示装置包括显示输入视频信号的液晶面板3，向液晶面板3施加光的背光源9，检测输入视频信号的APL的APL检测部6以及控制微型计算机8 其基于检测到的APL，可变地控制背光源9的每个预定时间的发光亮度的变化量。 控制微型计算机8执行控制，使得输入视频信号的APL的变化量变为更高的量变得大于输入视频信号的APL的变化量变为较低的量。