利用人眼的视觉暂留效应，使手在摆动到不同位置的时候，让位于一条直线上的LED显示二维图像的不同的列，实现图形扫描显示。-Use of temporary stay in the human visual effect that makes the swing to a different location at the time, so in a straight line on the LED display two-dimensional images of the different columns to achieve graphic scan showed.