Screen-door effect

[1] In LCD and DLP projectors, SDE can be seen because projector optics typically have significantly lower pixel density than the size of the image they project,[citation needed] enlarging these fine lines, which are much smaller than the pixels themselves, to be seen.

Since there were as many micro-lenses as there were original pixels, no resolution was lost, which was confirmed with modulation transfer function (MTF) measurements.

The screen-door effect on Digital Light Processing (DLP) projectors can be mitigated by deliberately setting the projected image slightly out of focus, which blurs the boundaries of each pixel to its neighbor.

This minimizes the effect by filling the black pixel perimeters with adjacent light.

[2] Newer DLP chip designs promise closer spacing of the mirror elements which would reduce this effect;[citation needed] however, some space is still required along one edge of the mirror to provide a control circuit pathway.