How does 2 lasers allow for 1.43:1 ratio image to be projected? Does one laser show top ½ and the other bottom ½? Why cant single laser project this ratio?

Ive read its not about inability of single laser to project this taller ratio but doing so caused the image to be not bright. So 2 lasers mean the 2 images will be superimposed on top of one another thus creating brighter image. Based on my limited reading la.

Cany any film connoisseur explain why?

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In other news, just bought DEMON SLAYER for IMAX at TGV Sunway Velocity! Will be my first experiencs for IMAX. Bought row G middle seats.