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Ambient Light Rejection(ALR) Screens and the Laws of PhysicsAs we know, the ultimate goal of an ALR screen is to provide viewers brightness and excellent quality that competes or even exceeds what other display technologies can provide with the lights on or off. The key issue is the management of light falling on a screen and ultimately, what is reflected back to the eyes of the viewers. Surfaces tend to reflect incoming light in all directions. You can take a look at a picture on a wall and from most angles it looks the same because the incoming light has been diffused or distributed evenly. These surfaces are called diffuse reflectors. In the field of projection screen, a matte white screen like the XYSCREEN WF1 is a near perfect diffuser, spreading the incoming light at nearly 180 degrees for extremely wide viewing angels. From a purely technical point of view this would be called a Lambertian surface. Lambertian reflectance is the property that defines an ideal “matte” or diffusely reflecting surface. The apparent brightness of a Lambertian surface to an observ2017-08-14