Specialist Projection Surfaces
n addition to standard white or grey rear projection screens there are various more specialised screen surfaces that can be used or projection for functionality or effect such as Projection Films, Lenticular Screens, Electronic Switchable Screens and Scrim Screens.
Projection surfaces can also be purchased off the roll to create custom shapes and sizes.
Rear Projection films are often self adhesive and can be applied to glass or perspex to turn it into a rear projection screen. There are a number of different brands and types that have different qualities. Some are straight forward greys for rear projection and others such as 3M Vikuiti use micro-beading to amplify the projected light and its almost black from surface is designed to reject light from the front. This is particularly useful for projection in daylight such as in shopfronts.
Other films include switchable film screens. These electronic films actually have an ON/OFF switch! When On, the a charge is passed to the film and the screen appears translucent like frosted glass and can be projected onto. When off, it becomes transparent and invisible!
Other daylight rejecting screens exist that can delivery even brighter and clearer images even in direct sunlight. These lenticular screens are made from a perspex type material and are cut to form a giant fresnel lens, amplifng the projection whilst the angle of the surface reflects sunlight away.
Other more simple fabrics can also be used as screens such as scrim, gauze and sharekstooth. These fabrics can be used for effects such because they both reflect and transmit light.
When front lit, both the scrim and everything behind it will be lit. This can lead to a variety of interesting effects:
A scrim will appear entirely opaque if everything behind it is unlit and the scrim itself is grazed by light from the sides or from above.
A scrim will appear nearly transparent if a scene behind it is lit, but there is no light on the scrim.
A dreamy or foggy look can be achieved by lighting a scene entirely behind a scrim.
If an image such as a Gobo or projection is aimed at the scrim, the image will appear on the scrim, but also any objects behind the scrim will be lit by the pattern as well.
In general, anything that is lit will be seen on both sides of a scrim: scrims do not absorb light.
Another effect is caused by layering two scrims, or using a screen behind a scrim to effectively show the image on two planes.