With the rapid development of liquid crystal display technology, 3D display gradually sought after the market and consumers. In the 3D LCD TV, there is a kind of shutter type 3D display technology. This technique also shot the same object's left and right eyes two pictures by two cameras at certain intervals, and synthetic treatment, on the display screen through time-sharing display out, then match the shutter glasses with the same time frequency, the same object images to the left and the right eyes respectively to watch camera captured. As the two pictures there is disparity is different, the human eye can feel the stereo image, realize 3D display effect. In order to achieve better 3D display effect, generally control the scanning backlight system through mode of backlight.%随着液晶显示技术的快速发展，3D液晶显示逐渐受到市场和消费者的追捧。在3D液晶电视中，有一类快门式3D显示技术。这种技术通过一定间隔的两台摄像机同时拍摄同一个物体的左右眼两幅画面，然后合成处理后，在显示屏上通过分时显示的方式显示出来，然后搭配与分时频率相同的快门式眼镜，使人的左右眼分别观看到摄像机拍摄到的同一物体画面。由于两幅画面存在视差的不同，人眼即可感受到了立体的影像，实现3D效果显示。为了实现更好的3D显示效果，一般通过扫描背光的方式来对背光系统进行控制。
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