Anti-reflective film

By designing a high-refractive index layer and a low-refractive index layer in the antireflection film, and controlling the surface roughness and interface ratio of the antireflection layer, the problem of light scattering of the existing antireflection film is solved, and a good reflection suppression effect is achieved.

CN119604787APending Publication Date: 2025-03-11NITTO DENKO CORP
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Patent Information

Application Number
CN202480003259.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-07-11
Filing Date
2024-07-09
Publication Date
2025-03-11

AI Technical Summary

Technical Problem

The conventional anti-reflection film includes a base material film, an adhesive layer and an anti-reflection layer in succession in the thickness direction, but the surface concave and convexity of the anti-reflection layer causes light scattering, which reduces the anti-reflection property.

Method used

An anti-reflective film is designed, and the anti-reflective layer includes a high refractive index layer and a low refractive index layer. The surface controlled surface roughness Sa of the anti-reflective layer is less than 4.5 nm. Under the cross-sectional view in the thickness direction, the ratio of the second interface length at the interface between the high refractive index layer and the low refractive index layer to the first interface length at the interface between the base material film and the adhesion layer is 1.10 or more.

Benefits of technology

While ensuring the adhesion of the anti-reflective layer to the base film, it effectively suppresses the scattering of incident light, and improves the reflection suppression effect.

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Abstract

An anti-reflection film (X) according to the present invention is provided with a base film (10), an adhesion layer (21) on the base film (10), and an anti-reflection layer (22) on the adhesion layer (21). The anti-reflection layer (22) includes a high refractive index layer (22a) in contact with the adhesion layer (21), and a low refractive index layer (22b) on the high refractive index layer (22a). The surface roughness (Sa) of the surface (22A) of the anti-reflection layer (22) on the opposite side from the substrate film (10) is 4.5 nm or less. The ratio (L2 / L1) of a second interface length (L2) at the interface between the high refractive index layer (22a) and the low refractive index layer (22b) to a first interface length (L1) at the interface between the base material film (10) and the adhesion layer (21) is 1.10 or more in a cross-sectional view in the thickness direction (H) of the anti-reflection film (X).
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Citation Information

Patent Citations

  • Cured coating film, Anti-reflection hard coating film using it, polarization plate and image display device

    JP2008088309A

  • High-frequency antenna unit and plasma processing apparatus

    JP2013258153A

  • Antireflection film and image display unit

    JP2022065437A