In this embodiment, the position of each pixel in the display image is treated in an XY rectangular coordinate system where the upper left corner of the image is set to the origin, {HEAD ~ the rightward direction} is set to {TAIL ~ the X axis}, and the downward direction is set to the Y axis 
In this embodiment , the position of each pixel in the display image is treated in an XY rectangular coordinate system where the upper left corner of the image is set to the origin , { HEAD ~ the rightward direction } is set to { TAIL ~ the X axis } , and the downward direction is set to the Y axis
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