Display device for improving crosstalk affecting three dimensional image quality and related method

A display device for showing 3D images includes a backlight module and a display section. The backlight module includes n light source units. The display unit section includes n display sections. Upon conditions that a first through kth display section are scanned to receive an image in an current frame, a (k+1)th through an nth display section receives an image in a previous frame, a first through a kth light source unit generate light, and a (k+1)th through nth light source unit do not generate light, the first through the kth display sections display according to the image in the current frame and the light from the first through the kth light source unit, while the (k+1)th display section through the nth display section do not display the image in the previous frame due to the (k+1)th light source unit through the nth light source unit not generating light.