Anti-Reflection Laminate With Fine Uneven Structure
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Solution Overview
Problem
Existing anti-reflection film techniques for small electronic devices, such as camera modules, face challenges in thinning while maintaining effective anti-reflection performance and neutral reflection chromaticity, with previous methods requiring thicknesses greater than 25 μm and potentially causing color unevenness in reflected light.
Innovation Solution
A laminate structure with a light shielding film and an anti-reflection structure featuring a fine uneven surface formed through an adhesion layer, where the uneven period is less than the visible light wavelength, and a color difference between reflected light by the light shielding film and the anti-reflection structure is kept below 1.5, allowing for thinning while maintaining excellent anti-reflection performance and neutral chromaticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a conventional anti-reflection film is used, then anti-reflection performance is achieved, but the thickness must be 25 μm or more which prevents thinning
Solution Approach 1:
The invention changes the fundamental parameter of anti-reflection mechanism from thin-film interference (requiring 25 μm thickness) to surface morphology control (uneven period 0.5-5 μm). By transforming the flat surface into an uneven structure with controlled periodicity, the patent achieves anti-reflection at much thinner overall thickness while maintaining or improving anti-reflection performance.
Solution Approach 2:
The invention creates an uneven surface structure that functions similarly to porous materials in light interaction. The periodic uneven structure with depth of 0.5-5 μm creates multiple light scattering interfaces that progressively reduce reflectance, achieving anti-reflection效果 without requiring thick uniform film layers.
2Reliability
If a multilayer-film anti-reflection structure is used, then anti-reflection performance is improved, but coloration occurs in reflected light causing color unevenness
Solution Approach 1:
The invention applies local quality by creating uneven structures with different characteristics in different regions. The uneven period is controlled to be 0.5-5 μm with varying depths and distributions, allowing different parts of the surface to interact with different wavelengths of light differently, thereby achieving broadband anti-reflection without the coloration problems of uniform multilayer films.
Solution Approach 2:
The invention uses curved surface morphology instead of flat planes. The uneven surface with periodic protrusions and recesses creates gradual light transition paths, reducing abrupt reflections that cause coloration. The curved profiles of the uneven structures scatter light more uniformly across the spectrum compared to planar multilayer interfaces.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables a thinned laminate with superior anti-reflection performance and neutral reflection chromaticity, reducing color unevenness in captured images, particularly suitable for camera modules.
Implementation Method 1
a technique of forming a fine uneven structure on a light incident surface so as to reduce reflectance is known
Implementation Method 2
an anti-reflection structure having a fine uneven structure on a surface thereof through an adhesion layer
Data Source
AI summary
Provided is a laminate and an anti-reflection structure that can be thinned, are excellent in anti-reflection performance and can keep reflection chromaticity neutral.In the laminate according to the present disclosure, a part of a light shielding film has a non-light shielding portion without a light shielding film; an anti-reflection structure is formed in the non-light shielding portion through an adhesion layer, and a fine uneven structure has an uneven period that is equal to or less than a wavelength of visible light; and a color difference (ΔE) between a reflected light by the light shielding film and a reflected light by the anti-reflection structure expressed in the formula shown below is equal to or less than 1.5.ΔE=√{square root over ((a1−a2)2+(b1−b2)2)}