公开(公告)号：US20150009249A1

公开(公告)日：2015-01-08

申请号：US14382068

申请日：2012-09-06

申请人： Yohei Kudo ,  Kohji Iwasaki

发明人： Yohei Kudo ,  Kohji Iwasaki

IPC分类号： G09G3/34 ,  H04N5/74 ,  G09G3/36

CPC分类号： G09G3/3406 ,  G02F1/133603 ,  G02F2001/133601 ,  G02F2203/30 ,  G06T5/008 ,  G09G3/3426 ,  G09G3/36 ,  G09G2320/062 ,  G09G2320/0646 ,  G09G2320/066 ,  G09G2330/021 ,  G09G2340/125 ,  G09G2360/16 ,  H04N5/202 ,  H04N5/57 ,  H04N5/66 ,  H04N5/7408 ,  H04N21/4436

摘要： Provided is a video display device wherein a light emission luminance control is performed in accordance with a video signal corresponding to each of a plurality of divisional areas of a backlight. In the video display device: while power limiting control is being performed, the contrast can be improved and further the feeling of brightness for a high-luminance video can be increased; and even when an OSD image is displayed, display quality can be prevented from being degraded. A backlight control portion of the video display device defines a first luminance of LED for each divisional areas according to a first feature amount for a video indicated by a video signal after synthesizing of an OSD signal to be displayed in a display area corresponding to the divisional area, and controls the LED light emission by uniformly multiplying the first luminance by constant scale factor in a range where a total value of the LED drive current is equal to or less than a predetermined allowable current value. An OSD output portion (2) determines and outputs the OSD signal by use of gray scale data that is associated with a second feature amount of the video indicated by an input video signal to be displayed in a display area of the OSD image (or by an input video signal to be displayed in a display area corresponding to the divisional area including the display area of the OSD image).

摘要翻译： 提供了一种视频显示装置，其中根据与背光的多个分割区域中的每一个相对应的视频信号执行发光亮度控制。 在视频显示装置中：当进行功率限制控制时，能够提高对比度，进一步提高高亮度视频的亮度感; 并且即使当显示OSD图像时，也可以防止显示质量下降。 视频显示装置的背光控制部分根据视频信号指示的视频的第一特征量，针对每个分区区域的LED定义第一亮度，合成要显示在与分区对应的显示区域中的OSD信号 并且通过在LED驱动电流的总值等于或小于预定的容许电流值的范围内将第一亮度均匀地乘以恒定比例因子来控制LED发光。 OSD输出部分（2）通过使用与由输入视频信号指示的视频的第二特征量相关联的灰度数据来确定并输出OSD信号，以显示在OSD图像的显示区域中（或由 要显示在与包括OSD图像的显示区域的分区相对应的显示区域中的输入视频信号）。