Jill Forer Goldenberg

Diffraction analysis of bulk diffusers for projection-screen applications

A method of analyzing bulk diffusers based on diffraction theory is developed. Bulk diffusers are often used to diffuse the incident light in projection screens. They are modeled as glass spheres randomlyh suspended throughout a plastic substrate. The theory accounts for a distribution of sphere diameters. The method of analysis and results are presented. With this method of analysis, bulk diffusers can be designed with optimal optical performance.

Ultra-Wide Viewing Angle Rear Projection Television Screen

Consumer based rear projection television (PTV) systems are composed of three CRTs which form the red, green and blue portions of the TV picture. Three projection lenses magnify these images and converge them into a single plane. The viewing screen is placed in this plane.

Rear projection screens for light-valve projection systems

Rear projection screens of light valve systems will be significantly different from existing screens used in consumer CRT rear projection sets. Artifacts such as speckle and more stringent requirements for resolution will direct the development of light valve screens. In this paper, we will give a mathematical analysis of the origin of speckle and will describe systems that were developed to measure the speckle contrast and the resolution of the screen in the presence of speckle. We will describe new screen designs that reduce the speckle contrast to an acceptable level while maintaining specifications for gain and resolution.