Screen-door effect

The fly screen effect (English Screen Door Effect ( SDE) or FPN ( Fixed Pattern Noise ) ) is a permanent visible image artifacts in digital video projectors. This effect occurs mainly in LCD projectors, but also at D -ILA projectors, these are due to the system exists.

The term flyscreen effect describes the unwanted, because technically induced black spacing between the individual pixels, or their projected information, and takes the form of a fly screen on. This distance comes from the construction, as between the individual LCD segments, the interconnects run for control, there the light is swallowed and thus can not impinge on the canvas. In DLPs result from the necessary narrow gaps between the mirror elements are also faint black grid. This reduces to one the brightness and contrast of the image, and also leaves to only a certain viewing distance. From a distance dependent on the thickness close to the screen, the eye can perceive the grid. If the Betrachtunsgabstand increased, the eye no longer perceives the fly screen effect, and the fine lines disappear.

It follows that the manufacturer continues to decrease the distance between the pixels. This is indicated in the ratio of surface proportion of the pixels to the total area in the so-called fill rate. D -ILA projectors have a fill factor of 90%, DLP Projectors and LCD Projectors 80 % from 60 %. Here the illuminated pixels of the image area is indicated by the percentage.

The improvement of the fill factor is also associated with other manufacturer-specific properties. So putting some manufacturers a special blur functions. Panasonic calls this technology in its projectors " Smooth Screen ".

• Image error