Update: Projection Screens
The new way of defining screen characteristics would have to include the challenges being presented by pixel-based high-resolution projectors. Home theater dealers, installers and consumers need to know more about what it takes to produce a good image at home. The largest improvement in image quality would be seen from the best projectors using this screen.
The primary reason for wanting to change how screens are described is that the angle of reflectivity of light from the screen was widened in this application. Light is more evenly reflected in every direction rather than being directed forward toward the center seat of the viewing area. Widening the angle of reflectivity resulted in a serious improvement in the uniformity of the image. Every part of the image looked good. There weren't any hot spots in the screen.
Normally, this screen parameter is described in terms of 'gain,' but the number for gain in this screen is similar to many other screens that don't perform nearly as well. We realized the numbering system, used to describe gain, was misleading in presenting the screen's true characteristics. At the same time, we need to specify this number when determining its fit with any projector. Why is this screen potentially different from another screen using the same number for gain?
Secondly, we need to change the way screens are described as it relates to the improvement in the screen surface itself. It is so smooth that there is almost no visibility of the screen in the image. In the past the granularity of the screen created an interference pattern with the pixilated image from the projector. Now, when you put up a flat field, it looks as if each pixel is backlit. All you see is what the projector is putting on the screen, not anything of the screen itself. The screen becomes virtually 'invisible.'