In an optimal viewing room, the projection screen
is reflective, whereas the surroundings are not. The ambient light
level is related to the overall reflectivity of the screen, as well as
that of the surroundings. In cases where the area of the screen is large
compared to that of the surroundings, the screen’s contribution to the
ambient light may dominate and the effect of the non-screen surfaces of
the room may even be negligible. Some examples of this are planetariums
and virtual-reality cubes featuring front-projection technology. Some
planetariums with dome-shaped projection screens have thus opted to
paint the dome interior in gray, in order to reduce the degrading effect
of inter-reflections when images of the sun are displayed
simultaneously with images of dimmer objects.
Grey
screens are designed to rely on powerful image sources that are able to
produce adequate levels of luminosity so that the white areas of the
image still appear as white, taking advantage of the non-linear
perception of brightness in the human eye. People may perceive a wide
range of luminosities as “white”, as long as the visual clues present in
the environment suggest such an interpretation. A grey screen may thus
succeed almost as well in delivering a bright-looking image, or fail to
do so in other circumstances.
Compared to a white screen, a grey
screen reflects less light to the room and less light from the room,
making it increasingly effective in dealing with the light originating
from the projector. Ambient light originating from other sources may
reach the eye immediately after having reflected from the screen
surface, giving no advantage over a white high-gain screen in terms of
contrast ratio. The potential improvement from a grey screen may thus be
best realized in a darkened room, where the only light is that of the
projector.
Partly fueled by popularity, grey screen technology has
improved greatly in recent years. Grey screens are now available in
various gain and grey-scale levels.
Are you confused about which projection screen to choose? Want quick information about the front and rear projection? Here’s an ultimate guide that will help you know in-depth about what’s better for you and what will make your movie viewing experience worth it! Optical front projection and rear projection screens provide many of the same benefits. Both projection screen types offer enhanced contrast and brightness compared to conventional non-optical projection screens. When this is said, there are major differences. Generally speaking, optical rear projection screens generate the best image, but they also require more space. Optical front projection screens are extremely space-effective, but also less resistant to ambient light than rear projection screens. Here we outline the main differences between the front and rear projection so you can decide what best suits your specific requirements. Space Usage Front projection does not require sp...
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