Patent ID: 7715097

Claim:
A screen that comprises an oriented film having a direction of maximum scattering (scattering axis) and a direction of minimum scattering (transmitting axis) for linear polarized light, and containing macromolecular fine particles in a polymer matrix, wherein the refractive index n of the macromolecular fine particles satisfies the following inequality (1): 1.51≦n≦1.58 (1), and the matrix and macromolecular fine particles satisfy the relationship represented by the following inequalities (2) and (3): 0 ≦|N trans− n trans|≦0.03 (2) 0.03≦| N scat− n scat|≦0.2 (3) (where Ntrans represents the refractive index of the matrix in the transmitting axis direction, Nscat represents the refractive index of the matrix in the scattering axis direction, ntrans represents the refractive index of the macromolecular fine particles in the transmitting axis direction and nscat represents their refractive index in the scattering axis direction), wherein the oriented film satisfies the following inequality (5): 1 ≦TT trans/ TT scat≦2 (5) (where TTtrans represents the total light transmittance on the transmitting axis and TTscat represents the total light transmittance on the scattering axis), and wherein the oriented film satisfies the following inequality (6): TTscat≧70% (6) (where TT represents the total light transmittance).