Optical Laminate Structure for Low-Specular Reflection Control
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Solution Overview
Problem
Existing optical laminates with laminated liquid crystal layers having different alignment states exhibit high specular reflection components due to the presence of a pressure-sensitive adhesive layer, leading to increased reflectivity.
Innovation Solution
The optical laminate comprises two liquid crystal layers with different alignment states, where the orientation of the optical axis in each layer continuously rotates in a specific direction, and the layers are disposed adjacent to each other without a pressure-sensitive adhesive layer, reducing specular reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If two liquid crystal layers with different alignment states are laminated with a pressure-sensitive adhesive layer, then the layers can be bonded together, but the specular reflection component increases
Solution Approach 1:
The patent removes the pressure-sensitive adhesive layer from between the liquid crystal layers, eliminating the source of harmful specular reflection while maintaining the structural integrity of the multi-layer configuration
Solution Approach 2:
The patent integrates the liquid crystal layers directly adjacent to each other without an intermediate adhesive layer, merging the interfaces to reduce reflection and improve optical performance
2Adaptability or versatility
If liquid crystal layers are laminated to achieve different alignment states, then optical control functionality is improved, but reflectivity increases
Solution Approach 1:
The pressure-sensitive adhesive layer is extracted from the structure, removing the harmful reflection source while preserving the functional benefits of multiple liquid crystal layers with different alignment states
Solution Approach 2:
The patent uses a composite structure of multiple liquid crystal layers with different alignment patterns (radial, axial, hybrid) to achieve versatile optical control while minimizing reflection through direct layer adjacency
3Ease of manufacture
If a pressure-sensitive adhesive layer is used to laminate liquid crystal layers, then manufacturing is simplified, but light diffusion is reduced
Solution Approach 1:
The adhesive layer is removed from the structure, eliminating the barrier to light diffusion while the manufacturing process is adapted to directly bond liquid crystal layers through alternative methods
4Stability of the object's composition
If multiple liquid crystal layers are stacked with adhesive layers, then structural stability is improved, but specular reflection increases
Solution Approach 1:
The adhesive layers are removed from between the liquid crystal layers, eliminating the reflection source while structural stability is maintained through direct layer bonding and optimized layer configuration
Solution Approach 2:
The patent addresses the stability issue by optimizing the in-plane alignment patterns and rotational relationships between layers rather than relying on adhesive bonding, shifting the stabilization mechanism from vertical bonding to horizontal alignment control
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
This configuration results in a laminate with low reflectivity of specular reflection components, enabling efficient light control and diffusion of different circularly polarized light components.
Implementation Method 1
the first liquid crystal layer has a liquid crystal alignment pattern in which an orientation of an optical axis derived from the liquid crystal compound changes while continuously rotating
Implementation Method 2
a liquid crystal diffraction element including a first cholesteric liquid crystal layer in which liquid crystal compounds are cholesterically aligned
Data Source
AI summary
An object of the present invention is to provide an optical laminate including a plurality of liquid crystal layers having different alignment states of liquid crystal compounds and having a low reflectivity of a specular reflection component in a case where light is incident; a display device; and a sensor. The optical laminate of the present invention includes a first liquid crystal layer containing a liquid crystal compound and a second liquid crystal layer containing a liquid crystal compound, in which the first liquid crystal layer and the second liquid crystal layer are adjacent to each other, the first liquid crystal layer has a liquid crystal alignment pattern in which an orientation of an optical axis derived from the liquid crystal compound changes while continuously rotating in at least one in-plane direction, and predetermined requirements are satisfied.