I've owned a Casio G-Shock that was negative by default (G-5600KG) and I found that the viewing angle on a negative display was much more narrow than on a posit

I've owned a Casio G-Shock that was negative by default (G-5600KG) and I found that the viewing angle on a negative display was much more narrow than on a positive. Most of the reviews on Amazon state the same. Anyone have an explanation for this?