Image display screen and image display device
AssigneeTeijin Limited
InventorsTaro Oya, Tadashi Shingu
Life of this patent
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Abstract
An image display screen which is composed of a multi-layer film consisting of at least 11 layers and formed by alternately laminating first thermoplastic resin layers having a thickness of 0.05 to 0.03 μm with second thermoplastic resin layers having a thickness of 0.05 to 0.3 μm and a parallel ray transmittance of 50% or more, and which has at least 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 nm, and an image display device comprising the same as a screen. This screen has improved transparency while maintaining the definition of an image.
Claims10
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.
A multi-layer film, which comprises at least 11 layers and formed by alternately laminating (1) first thermoplastic resin layers having a thickness of 0.05 to 0.3 μm and second thermoplastic resin layers having a thickness of 0.05 to 0.3 him, 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 rim and (3) a parallel-ray transmittance of 50% or more, and (4) is for an image display screen, 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.
Dependencies are inferred from the claim text.