Projection screens and the like

• Main Authors: Clabburn, Robin, Phillips, Nicholas John, Yeo, Terence Edward, Batchelder, Lee
• Format: Patent
• Language: English
• Published: 25.02.2003

THIS INVENTION relates to a material suitable for use as a light diffusing screen or rear projection screen and to a material suitable for use as a front projection screen and for analogous purposes, such as in reflective signs, etc. A light diffusing screen is made by exposing a photopolymerisable material to polymerising light through a mask having an array of light-transmitting apertures in an opaque background or vice versa, at least some of the light being directed obliquely onto the photopolymerisable material. The resulting photopolymerised material has asymmetric light diffusing properties. In some embodiments two beams of light directed onto the photopolymerisable material are equally and oppositely inclined to the perpendicular to the plane of the material. An analogous effect may be provided, in other embodiments, by exposing the photopolymerisable material to light converging conically on the photopolymerisable material.