Flexible Display Planarized Layer for Thin Stable Electrode Bonding
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Solution Overview
Problem
Current flexible display devices face challenges in achieving a balance between thickness and manufacturing cost while maintaining stability and sensitivity, particularly in the placement and bonding of touch electrodes and light conversion structures.
Innovation Solution
The flexible display device incorporates a planarized layer with a thickness ranging from 0.5 μm to 200 μm, which serves as an adhesive layer to stabilize film layers and ensure even surface contact, allowing for the efficient bonding of touch electrodes and light conversion structures, thereby reducing the overall thickness and enhancing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a flexible display device uses conventional bonding methods for touch electrodes and light conversion structures, then the device achieves basic functionality, but the thickness increases and manufacturing cost rises
Solution Approach 1:
The patent employs ultra-thin planarized layers (50-200 nm) as flexible adhesive films to bond touch electrodes and light conversion structures. These thin film layers maintain the flexibility required for foldable displays while dramatically reducing overall device thickness compared to conventional bonding methods that require thicker adhesive layers for structural support.
Solution Approach 2:
The patent optimizes the thickness parameter of the planarized layer to a specific range (50-200 nm) that balances multiple requirements: thin enough to reduce overall device thickness, yet thick enough to provide adequate adhesive bonding strength. This precise parameter control enables reduced thickness without compromising manufacturing feasibility or device performance.
2Length of moving object
If the planarized layer is made thinner to reduce overall device thickness, then the thickness is reduced, but the bonding stability and sensitivity may deteriorate
Solution Approach 1:
The patent identifies and implements an optimal thickness range (50-200 nm) for the planarized layer that resolves the contradiction between thinness and bonding stability. Within this range, the layer is thin enough to reduce overall device thickness while maintaining sufficient adhesive strength and bonding stability, preventing both excessive thickness and insufficient bonding performance.
Solution Approach 2:
The planarized layer is constructed from composite materials that combine adhesive properties with mechanical strength characteristics. This composite structure enables the ultra-thin layer to provide both bonding functionality and structural stability, maintaining reliability despite the reduced thickness.
3Strength
If conventional adhesive layers are used to bond film layers, then adequate bonding strength is achieved, but the surface contact evenness and sensitivity are compromised
Solution Approach 1:
The patent uses ultra-thin planarized layers (50-200 nm) that conform precisely to the underlying substrate surface topology. This thin film structure provides uniform surface contact across the entire bonding area, ensuring even sensitivity distribution, while the material composition maintains adequate bonding strength through molecular-level adhesion.
Solution Approach 2:
The planarized layer exhibits locally optimized properties: its ultra-thin structure provides superior surface conformality and even contact in regions requiring high sensitivity, while the material composition and interfacial design ensure adequate bonding strength at the adhesive interface. This local quality differentiation resolves the contradiction between bonding strength and surface evenness.
Data Source
AI summary
The disclosure provides a flexible device. The flexible display device includes a flexible substrate and a planarized layer. A thickness of the planarized layer is in a range from 0.5 μm to 200 μm. A thickness ratio of the thickness of the planarized layer to a thickness of the flexible substrate is in a range from 0.025 to 20.