Pretty sure you’re talking about CRT TV’s scanline effect.
It leaves gaps in the image for you brain to “fill in the gap” and add perceived detail.
It leaves gaps in the image for you brain to “fill in the gap” and add perceived detail.
Interleaved scanlines are a great trick to increase the temporal resolution, but don't do much for (or against) spatial resolution.
Or what do you mean by scanline effect?