Liquid Crystal Optical Device With Impact-Absorbing Buffer Layer
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Solution Overview
Problem
Existing liquid crystal cells face issues with maintaining cell gap and adhesion between substrates, leading to light leakage due to misalignment of liquid crystals under external impacts, particularly in mobile applications.
Innovation Solution
Incorporating a buffer layer with specific elastic moduli between the outer substrate and the liquid crystal cell to absorb external impacts, along with adhesive layers with higher elastic moduli to maintain alignment and prevent light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a pressure-sensitive adhesive layer is used to maintain cell gap and provide adhesion, then adhesion force between substrates is improved, but the layer deforms under external impact causing liquid crystal misalignment and light leakage
Solution Approach 1:
The adhesive system is divided into two distinct layers: a lower adhesive layer providing strong bonding between substrates, and an upper adhesive layer with higher elasticity protecting the liquid crystal layer. This segmentation allows each layer to perform its specialized function without compromising the other.
Solution Approach 2:
Different regions of the adhesive structure are assigned different material properties. The lower adhesive layer near the substrate uses materials with high adhesion strength (such as acrylic resins), while the upper adhesive layer closer to the liquid crystal uses materials with higher elasticity (such as silicone resins) to locally absorb impact forces.
Solution Approach 3:
The adhesive system employs a composite structure combining materials with different mechanical properties. The lower layer uses rigid adhesive materials for strong bonding, while the upper layer uses elastic adhesive materials for impact absorption, creating a composite adhesive system that achieves both strong adhesion and impact resistance.
2Strength
If the adhesive layer has high adhesion strength, then substrate bonding is improved, but the layer becomes rigid and cannot absorb external impacts
Solution Approach 1:
The adhesive system is divided into two distinct layers: a lower adhesive layer providing strong bonding between substrates, and an upper adhesive layer with higher elasticity protecting the liquid crystal layer. This segmentation allows each layer to perform its specialized function without compromising the other.
Solution Approach 2:
The elastic modulus parameter is varied through the adhesive layer thickness. The lower adhesive layer uses materials with lower elastic modulus (0.1-10 MPa) for strong bonding, while the upper adhesive layer uses materials with higher elastic modulus (10-100 MPa) to provide impact absorption capability.
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 buffer layer effectively absorbs external impacts, preventing deformation and maintaining liquid crystal orientation, thus reducing light leakage and ensuring stable adhesion between substrates.
Implementation Method 1
a buffer layer having a loss elastic modulus lower than the loss elastic modulus of the pressure-sensitive adhesive layer inside the liquid crystal cell
Data Source
AI summary
The present application relates to an optical device. The optical device of the present application can properly maintain a cell gap of a liquid crystal cell, have excellent adhesion between an upper substrate and a lower substrate, and solve light leakage due to misalignment of liquid crystals occurring upon external impacts.