Screen

1. 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).

2. A screen according to claim 1 , wherein the oriented film satisfies the following inequality (4):

H scat/ H trans≧2  (4)

(where Hscat represents the haze value in the scattering axis direction and Htrans represents the haze value in the transmitting axis direction).

3. A screen according to claim 1 , wherein the oriented film satisfies the following inequality (7):

PT trans= TT trans− DF trans≧50%  (7)

(where PTtrans represents the parallel light transmittance in the transmitting axis direction, TTtrans represents the total light transmittance in the transmitting axis direction, and DFtrans represents the diffused light transmittance in the transmitting axis direction).

4. A screen according to claim 1 , wherein the oriented film satisfies the following inequality (8):

PT scat= TT scat− Df scat−≦40%  (8)

(where PTscat represents the parallel light transmittance in the scattering axis direction, TTscat represents the total light transmittance in the scattering axis direction, and DFscat represents the diffused light transmittance in the scattering axis direction).

5. A screen according to claim 1 , which further comprises a transparent base, the oriented film and base being attached together.

6. A screen according to claim 1 , wherein the content of the macromolecular fine particles in the oriented film is 0.01-40 parts by weight to 100 parts by weight of the polymer.

7. A screen according to claim 1 , wherein the macromolecular fine particles are fine particles having a core-shell structure.

8. A screen according to claim 1 , wherein the polymer is polyethylene terephthalate.

9. A screen according to claim 1 , which further comprises a polarizing element.

10. A screen according to claim 1 , which further comprises a metal layer.

11. A screen according to claim 1 , which is a rear-projection screen.

12. A screen according to claim 1 , which is a front-reflective screen.

13. 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), and the oriented film simultaneously satisfies the following inequalities (4) to (6):

H scat/ H trans≧2  (4)

1 ≦TT trans/ TT scat≦2  (5)

TT≧70%  (6)

(where Hscat represents the haze value on the scattering axis, Htrans represents the haze value in the transmitting axis direction, TTtrans represents the total light transmittance on the transmitting axis, TTscat represents the total light transmittance on the scattering axis, and TT represents the total light transmittance).

14. A method of using an oriented film, comprising forming a screen from 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),

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):

TT scat≧70%  (6)

(where TT represents the total light transmittance).