Patent ID: 6304379
Filing Date: 2001-10-16
Classification: G03B

Abstract:
A rear projection screen comprising a Fresnel lens sheet and a lenticular lens sheet, in which the lens pitch of the Fresnel lenses formed on the Fresnel lens sheet is at most 0.12 mm and the lens pitch of the lenticular lenses formed on the lenticular lens sheet is at most 0.6 mm, and which is characterized in that the pitch, P.sub.M (mm), of the moire fringes that may be given by the Fresnel lenses and the lenticular lenses at a spatial frequency of at least 3/P.sub.1 is at most 3 mm, the moire pitch, P.sub.M (mm), being given by the following formula (1):P.sub.M =1/.vertline.n/P.sub.1 -m/P.sub.2.vertline. (1)whereinP.sub.1 (mm) indicates the smaller one of the lens pitch of the Fresnel lenses and the lens pitch of the lenticular lenses;P.sub.2 (mm) indicates the other one of the two;n and m each are a natural number satisfying the following formulae (2) and (3):n.ltoreq.15.times.P.sub.1 /P.sub.2 (2)m.ltoreq.15.times.P.sub.2 /P.sub.1 (3).