Patent ID: 7031058
Filing Date: 2006-04-18
Classification: G02B,G03B

Abstract:
1. An image display screen which comprises (1) a multi-layer film comprising at least 11 layers and formed by alternately laminating first thermoplastic resin layers having a thickness of 0.05 to 0.3 μm with second thermoplastic resin layers having a thickness of 0.05 to 0.3 μm and which has (2) a reflection peak with a maximum reflectance 5 to 80% higher than the base line of reflectance and a half-value width of 20 to 200 nm in its reflectance curve for visible light having a wavelength of 380 to 780 μm and (3) a parallel ray transmittance of 50% or more, wherein a difference in melting point measured by DSC between the first thermoplastic resin and the second thermoplastic resin before the multi-layer film is formed therefrom is at least 15° C., and: wherein the first thermoplastic resin and the second thermoplastic resin are both polyesters and contain ethylene terephthalate in an amount of 80 mol % or more based on the total of all the recurring units of all the polyesters, or wherein the first thermoplastic resin and the second thermoplastic resin are both polyesters and contain ethylene-2,6-naphthalene dicarboxylate in an amount of 80 mol % or more based on the total of all the recurring units of all the polyesters.