Back-projection screen
AssigneeThomson Licensing
InventorGunther Haas
Life of this patent
Estimating the term…
Abstract
According to the invention, elements 71 distributed over one and the same diopter allow both macrocollimation and microfocussing by reflecting the light rays projected onto this screen; refractive elements 72 may also be distributed over this diopter. The screen according to the invention has but a single main optical component 7; it is therefore very inexpensive to manufacture. The invention applies especially to very compact projection devices and to cases in which the projection angles of incidence are high.
Claims8
A backprojection screen (1) to be placed in the field of an envelope of projection light rays, characterized in that it comprises elements (71) distributed over one and the same diopter that makes it possible both to macro-collimate and microfocus said rays by reflection.
The screen as claimed in any one of the preceding claims, characterized in that said diopter corresponds to the rear face of said screen.
A backprojection image display system comprising a screen as claimed in any one of the preceding claims, at least one image source and optical means for generating the image of this source on the screen through at least one objective that generates said envelope of projection light rays.
Dependencies are inferred from the claim text.