A lenticular lens provided on the viewer side of a transmission type screen is composed of at least two layers, that is, a surface layer and a base layer at least one of which contains a light dispersing material, and a visible light absorbing material is mingled in at least one of these two layers,...http://www.google.com/patents/US5661600?utm_source=gb-gplus-sharePatent US5661600 - Transmission type screen and method of manufacturing thereof
