Dual Adhesive System for Display Device Impact Resistance
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Solution Overview
Problem
Current display devices lack sufficient durability due to inadequate structural support and adhesive systems, which can lead to mechanical stress and damage from external impacts.
Innovation Solution
A display device design incorporating a driving circuit layer, a display layer, and a dual adhesive system with a thicker first adhesive member and a thinner second adhesive member, where the first adhesive member is composed of a UV-curable adhesive including specific monomers and photoinitiators, providing enhanced impact resistance and bonding between the driving circuit layer, display layer, and window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single adhesive system is used to bond the driving circuit layer and display layer to the window, then the device structure is simple, but the durability and impact resistance are insufficient
Solution Approach 1:
The adhesive system is segmented into two distinct adhesive members: a first adhesive member positioned between the driving circuit layer and the window, and a second adhesive member positioned between the display layer and the window. This segmentation allows each adhesive member to be optimized for specific functions, with the first adhesive member providing thicker bonding for structural support and the second adhesive member providing thinner bonding for display layer attachment, thereby improving overall durability without excessive complexity
Solution Approach 2:
Different adhesive members are applied at different locations with different thicknesses and properties. The first adhesive member is thicker and positioned at the driving circuit layer interface to provide primary structural support and impact absorption, while the second adhesive member is thinner and positioned at the display layer interface for precise bonding. This local differentiation of adhesive quality optimizes the overall bonding system for both strength and durability
2Strength
If the adhesive member is made thicker to improve bonding strength, then the bonding between layers is stronger, but the overall device volume increases
Solution Approach 1:
The bonding function is segmented between two adhesive members with different thicknesses. The first adhesive member is thicker and positioned where maximum bonding strength is needed (driving circuit layer to window interface), while the second adhesive member is thinner and positioned where precise alignment is more critical (display layer to window interface). This segmentation allows the device to achieve strong bonding without uniformly increasing the thickness of all adhesive layers, thereby minimizing overall volume increase
Solution Approach 2:
Adhesive thickness is locally optimized based on functional requirements. The first adhesive member has greater thickness locally at the driving circuit layer interface to provide enhanced bonding strength and impact resistance, while the second adhesive member has reduced thickness locally at the display layer interface. This local quality differentiation ensures strong bonding where needed while maintaining compact overall device dimensions
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 dual adhesive system significantly improves the durability of the display device by absorbing impacts and maintaining strong bonding between components, thereby enhancing the device's resistance to mechanical stress and external forces.
Implementation Method 1
The first adhesive member may include a first adhesive and an ultraviolet (UV) curing agent
Data Source
AI summary
A display device includes a driving circuit layer including a thin film transistor, a display layer at the driving circuit layer and overlapping a portion of the driving circuit layer, a window at the display layer, a first adhesive member between the driving circuit layer and the window, and a second adhesive member between the display layer and the window and spaced from the first adhesive member in a plane view.