An image projection method comprises the steps of a) obtaining an image pixel array for the image to be projected; b) obtaining a plurality of pixel allocation arrays for the image pixel array, whereby each pixel allocation array comprises occupied elements and vacant elements; c) generating a trigger pulse train for a laser light source according to a pixel allocation array, whereby a trigger pulse is generated for each occupied element; d) generating a modulation signal for the laser light source; e) switching the laser light source with the trigger pulse train and modulating the laser light source with the modulation signal to generate a laser light pulse sequence for a sub-frame image; f) and scanning the laser light pulse sequence to traverse the display; thereby, the steps c) to f) are carried out for each pixel allocation array so that the image appears on the display.