The importance of a good projection surface
While the technical engineering of a good projection screen partly focuses on operation and installation, the projection screen surface is by far the most important element. The choice of screen surface type determines the screen’s ability to handle the projected images.
Three factors play an important role in the choice of a projection screen surface: ambient light levels, projector performance (output) and the position of the projector. These variables need to be tuned to each other in order to create an optimum image.
Projection screen surface properties
The properties of a projection screen surface are expressed in terms of its gain and viewing angle.
Gain
Gain is a measure of reflection performance. Gain is related to a universal reference standard: Magnesium Carbonate (MgCO3). Rather than absorbing light, MgCO3 reflects projected light back with perfect evenness. Matte White, with a measured gain of 1.0, is the standard brightness for a projection screen surface.
Viewing angle
The viewing angle of a projection screen fabric indicates the maximum angle at which the projected image is still clearly visible. The brightness of the image decreases as the viewing angle increases in relation to the axis of the image. The maximum viewing angle is the point at which the viewer perceives less than 50% of the luminous intensity of the image. This limit is the commonly accepted standard for image quality.
the projection screen surface is the most important element.
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