Flexible Display Device Layer Bonding
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Solution Overview
Problem
Existing flexible display devices face challenges in achieving improved flexibility while maintaining effective touch sensing and light reflection prevention.
Innovation Solution
A flexible display device is designed with a layered structure comprising a display panel layer, a touch sensing layer, a reflection prevention layer, and a window layer, where the touch sensing layer includes conductive patterns and a touch insulation layer, and the reflection prevention layer reduces external light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesion members are used to bond layers together, then bonding strength is improved, but device thickness increases and flexibility deteriorates
Solution Approach 1:
The patent removes adhesion members from the display device structure. The layers (display panel, touch sensing layer, reflection prevention layer, and window layer) are bonded directly to each other without intermediate adhesive layers, thereby eliminating the thickness contribution of adhesion members while maintaining structural integrity through direct contact bonding surfaces.
Solution Approach 2:
The patent employs asymmetric bonding approaches where different layers are directly bonded to each other with specific surface characteristics. The display panel layer, touch sensing layer, reflection prevention layer, and window layer are arranged in an asymmetric stack where each interface provides its own bonding characteristics without requiring symmetric adhesive layers between them.
2Reliability
If multiple layers are stacked to achieve touch sensing and reflection prevention functions, then functional performance is improved, but device thickness increases
Solution Approach 1:
The patent combines multiple functional layers (display panel, touch sensing, reflection prevention, and window layers) into a tightly integrated stacked structure where layers are directly bonded without intermediate adhesion members. This merging approach maintains all necessary functions while minimizing the cumulative thickness by eliminating redundant bonding layers.
Solution Approach 2:
The display panel layer serves multiple functions simultaneously: it provides the display function, acts as a structural substrate for the touch sensing layer, and contributes to the overall protective structure. The window layer similarly provides both protective coverage and structural support, reducing the need for separate structural layers.
3Length of moving object
If adhesion members are omitted to reduce thickness, then flexibility is improved, but bonding reliability may worsen
Solution Approach 1:
The patent extracts and removes adhesion members from the device structure, relying instead on direct bonding between layers. The display panel layer, touch sensing layer, reflection prevention layer, and window layer are bonded directly to each other through their respective surfaces, eliminating the need for separate adhesive materials while maintaining bonding reliability.
Solution Approach 2:
The patent employs thin-film structures for all layers, where each layer is designed with appropriate thickness and material properties to provide both bonding capability and flexibility. The direct contact between thin film layers enables reliable bonding while maintaining the overall flexibility and thin profile of the device.
Data Source
AI summary
A flexible display device including a display panel layer, a touch sensing layer, a reflection prevention layer, and a window layer. The touch sensing layer is disposed directly on a first display panel surface, a second display panel surface facing the first display panel surface in a thickness direction, or a second base surface of the reflection prevention layer. The reflection prevention layer is disposed directly on the second display panel surface or a first base surface of the touch sensing layer. The window layer is disposed directly on the first base surface or the second base surface.