Two-Region Optical Bonding Layer for Display Panels
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Solution Overview
Problem
Existing optical bonding materials for display panels face challenges such as air gap reflection, yellowing over time, low stress absorption, and reworkability issues, leading to inefficiencies in manufacturing and increased costs, especially for large and high-definition displays.
Innovation Solution
A display panel assembly with an optical bonding layer comprising two regions of different physical properties, where the second region has higher hardness than the first, formed by a curable layer of silicon-containing resins using hydrosilylation, providing superior adhesion and stress absorption while allowing for easy handling and reworkability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single hardness optical bonding layer is used, then manufacturing is simplified, but stress absorption and shock resistance are insufficient
Solution Approach 1:
The optical bonding layer is divided into two distinct regions with different hardness values: a first region with lower hardness (Shore A 10-30) for stress absorption and a second region with higher hardness (Shore A 40-60) for structural support. This local differentiation allows each region to perform its specific function optimally while maintaining overall reliability.
Solution Approach 2:
The patent employs a composite bonding layer structure combining two materials with different physical properties - a softer silicone-based material for the first region and a harder material for the second region. This composite approach enables simultaneous achievement of stress absorption and structural integrity that cannot be obtained with a single homogeneous material.
2Illumination intensity
If optical bonding is used to eliminate air gaps, then optical performance is improved, but yellowing over time occurs with conventional materials
Solution Approach 1:
The patent modifies the chemical composition and physical parameters of the bonding layer materials to achieve both high optical transmission and long-term color stability. The first region uses a silicone-based material with specific molecular structure that resists yellowing, while maintaining the required softness for stress absorption. The second region uses a harder material optimized for both optical clarity and durability.
3Strength
If conventional optical bonding materials are used, then adhesion is achieved, but reworkability and handling ease are compromised
Solution Approach 1:
The bonding layer design provides different functional qualities in different regions: the first softer region maintains strong adhesion to both substrates while the second harder region provides a more handleable interface for rework operations. This spatial differentiation of properties enables both strong bonding and ease of repair.
Solution Approach 2:
The two-region bonding layer acts as an intermediary structure between the substrates, where the softer first region provides the bonding function and the harder second region provides the handling and reworkability function. This intermediary structure mediates between the conflicting requirements of strong adhesion and ease of repair.
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 optical bonding layer reduces air gap reflections, improves shock resistance and thermal stress absorption, and enables efficient manufacturing and reworkability of large display panels with minimal damage to components.
Implementation Method 1
the second region comprises a second cured silicon-containing resin formed by hydrosilylation of a first silicon-containing resin comprising aliphatic unsaturation and a second silicon-containing resin comprising silicon-bonded hydrogen
Data Source
AI summary
A display panel assembly is made by optically bonding a display panel and a substantially transparent substrate. Optical bonding is carried out by forming a silicon-containing optical bonding layer having regions of different physical properties