Fly screen effect

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As the magnification increases, the distance between pixels becomes clearer.

The screen-door effect (English Screen Door Effect (SDE) ) is a permanent visible image artifacts in digital video projectors. This effect occurs predominantly with LCD projectors, but these are also inherent in the system in D-ILA projectors.

The term fly screen effect describes the undesired, because technically conditioned, black distance between the individual pixels or their projected information, and takes the form of a fly screen . This distance comes from the design, since the control tracks run between the individual LCD segments, where the light is swallowed and therefore cannot hit the screen. With DLPs , the necessary narrow gaps between the mirror elements also result in weak black grids. On the one hand, this reduces the brightness and contrast of the picture and on the other hand only allows a certain viewing distance. The eye can perceive the grid from a proximity to the screen that depends on the thickness of the distance . If the viewing distance is increased, the eye no longer perceives the screen effect and the fine lines disappear again.

As a result, manufacturers keep reducing the distance between the pixels. This is indicated in the ratio of the area proportion of the pixels to the total area in the so-called fill rate. D-ILA projectors have a fill factor of around 90%, DLP projectors of 80% and LCD projectors of 60%. Here, the percentage is used to indicate the image area illuminated by the pixels.

The improvement in the fill factor is also accompanied by other manufacturer-dependent properties. Some manufacturers use special blurring functions. Panasonic calls this technology "Smooth Screen" for its projectors.