Optical Laminate with Modulating Layer for Reflection Control
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Solution Overview
Problem
Existing optical laminates for image display devices suffer from interfacial reflection and interference fringes due to differences in refractive indices between the light transparent base material and the hard coat layer, leading to reduced visibility and image quality.
Innovation Solution
Incorporating an optical modulating layer between the light transparent base material and the hard coat layer, composed of components from both layers, to eliminate the interface and prevent reflection and interference fringes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a layer having a higher-refractive index and a layer having a lower refractive index are stacked on a light transparent base material to reduce image reflection, then reflectance is reduced, but interface reflection and interference fringes occur between the mutually superimposed layers
Solution Approach 1:
An optical modulating layer is introduced as an intermediary between the light transparent base material and the hard coat layer. This intermediate layer has a refractive index that is intermediate between the base material and the hard coat layer, thereby reducing the refractive index difference at the interfaces and suppressing both image reflection and interface reflection simultaneously
Solution Approach 2:
The refractive index parameter is gradually changed across the layers. By arranging layers with progressively changing refractive indices from the base material to the hard coat layer, the optical impedance mismatch is reduced, minimizing reflection and interference effects while maintaining the anti-reflection function
2Reliability
If the refractive index of the light transparent base material is different from the refractive index of the hard coat layer, then optical interference effects occur, but visibility and appearance of the image are deteriorated
Solution Approach 1:
Different regions of the laminate structure are assigned different refractive index qualities. The optical modulating layer creates a gradual transition zone with intermediate refractive index properties, while the base material and hard coat layer maintain their respective refractive indices. This local differentiation of optical properties reduces interference fringes while preserving necessary optical functions
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 effectively prevents interfacial reflection and interference fringes, enhancing visibility and mechanical strength by eliminating the interface between the base material and the hard coat layer, thereby improving image quality.
Implementation Method 1
a layer having a higher-refractive index and a layer having a lower refractive index than the higher-refractive index layer are generally stacked on a light transparent base material... interface reflection and interference fringes often occur in the interface between the mutually superimposed layers
Data Source
AI summary
An optical laminate is provided which effectively prevents the occurrence of interface reflection and interference infringes by eliminating the interface between a light transparent base material and a hard coat layer. The optical laminate includes a light transparent base material, and an optical modulating layer and a hard coat layer provided on the light transparent base material, in that order. The optical modulating layer includes a component constituting the light transparent base material and a component constituting the hard coat layer.