trepxe, you mean the horizontal pixels, right? Because that's how the passive sets work. And dual play does work in 3D, cutley7ad. The left and right eyes of a regular 3D set of glasses pick up odd and even horizontal pixels. So left picks up odd and right picks up even. But in dual play, the glasses are a bit different. One person would have glasses that only pick up odd pixels and the other would only pick up even pixels. So ultimately, two people would see two different images on one screen.