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 {HEAD ~ the area} outside of the effective display area is irradiated with {TAIL ~ the light} is controlled according to a luminance level of the picture information 
is irradiated with
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 { HEAD ~ the area } outside of the effective display area is irradiated with { TAIL ~ the light } is controlled according to a luminance level of the picture information
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