This might seem like a stupid question but I really can't wrap my head around it. For example Dell has both U2415 (16:10) and U2414H (16:9). Those monitors supposedly have the same screen size, so how is it ever possible that one manages to offer additional vertical screen space while the other doesn't?
The only explanation that I can come up with is that the pixel sizes might be different. But doesn't a single pixel have the same size on all four dimensions? (i.e. it must be a perfect circle shape or a perfect square shape etc. instead of an oval/rectangle. You get what I mean) If it has the same size on all dimensions, then no matter how you make one pixel bigger/smaller and how you arrange the pixels, I don't see how it's possible to get two different aspect ratios on the same base screen size (without distorting the screen content being displayed). Or is my assumption wrong?