Projection screen and projection display

Details Projection screen and projection display Projection screen and projection display

2006-07-04

2006-07-04

Mahoney, Christopher (Department: 2851)

Optical: systems and elements

Projection screen

Rear projection screen

C359S742000

Reexamination Certificate

active

07072109

ABSTRACT:
A projection screen111comprises a total reflection prism lens114and a lenticular lens115provided on the viewer's side of the total reflection prism lens114. The total reflection prism lens114has a plurality of unit prisms113on its back surface (the outermost plane of incidence) on which imaging light L is incident. Each unit prism113has an apical angle λ that corresponds to the angle between the plane of incidence113aand the plane of total reflection113b, and the apical angles λ of the unit prisms113vary with the position of each unit prism113on the screen plane. In particular, the unit prisms113have apical angles λ varying continuously from 30° to 45° so that the apical angles λ on the side distant from the center O of the concentric circles are greater than the apical angles λ on the side close to this center O.

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