| 摘要 |
A screen comprises a support ( 1 ) with focusing elements; an active diffuser ( 3 ) is fixed to the support; it has an active face directed away from the support and located in the focal plane of the focusing elements of the support; the screen has an opaque layer ( 2 ) with a thickness less than 20 mum having openings adapted to let through the light focused by the focusing elements. This opaque layer is formed on the active face of the diffuser, or on an intermediate layer formed on the active layer of said diffuser. The openings in the opaque layer ensure the screen has a high contrast.
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