Lines Rendered not "pixel perfect"

Hi, I am trying to render some lines on the screen to create a dash line as seen in the above image. Each tiny line arnt render to a "pixel perfect" conditions, some with their corners chipped off. The dashed lines are currently created using geometry shader but similar effects appears when I uses 2D quads.

What I hope to achieve is something like this:

This defect appears when the quads are too small, either because they are too far away from the perspective camera or their size is too small. I notice this also happens on the editor screen as well.

Is there any setting I can perform to solve this problem?