A projection type display device 1, wherein a scanning speed of the light deflection device is changed according to picture information and a period in which the area outside of the effective display area is irradiated with the light is controlled according to {HEAD ~ a luminance level} of {TAIL ~ the picture information} 
A projection type display device 1 , wherein a scanning speed of the light deflection device is changed according to picture information and a period in which the area outside of the effective display area is irradiated with the light is controlled according to { HEAD ~ a luminance level } of { TAIL ~ the picture information }
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