Patent ID: 7184211
Filing Date: 2007-02-27
Classification: G03B

Abstract:
1. A transmissive screen, comprising: a Fresnel lens sheet with a Fresnel lens unit having a plurality of lenses formed at constant pitches; and a microlens array sheet with a microlens unit having a plurality of lenses formed at constant pitches, wherein the Fresnel lens sheet and the microlens array sheet are placed opposite to each other and projected images enter from one side of the screen to be projected on the other side, and further, assuming that a lens pitch on one side of the microlens unit is P; a lens pitch of the Fresnel lens unit is Pf; and a projected pixel-frame pitch of an image to be projected on the screen is Pb, the following conditions are satisfied: the lens pitch P on one side of the microlens unit is at least one of 0.8 to 0.55 times, 0.45 to 0.36 times, and 0.3 times or less than the lens pitch Pf of the Fresnel lens unit; the lens pitch P on one side of the microlens unit is at least one of 0.8 to 0.55 times, 0.45 to 0.36 times, and 0.3 times or less than the pixel-frame pitch Pb; and the lens pitch Pf of the Fresnel lens unit is at least one of 0.8 to 0.55 times, 0.45 to 0.36 times, and 0.3 times or less than the pixel-frame pitch Pb, and the following expressions are satisfied: