Touch Display Reinforcing Layer for Slim-Border Bend Reliability
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Solution Overview
Problem
Current panel driver integrated circuits with COP technology face issues of structural reliability due to poor adhesion of bending reinforcement materials, leading to potential circuit damage and interface separation during bending, which complicates achieving a slim border design.
Innovation Solution
A touch display device design incorporating a reinforcing structure layer on the bending portion of the driving substrate that extends to seal gaps and serves as both a protective and sealing material, using adhesive materials with suitable Young's modulus to prevent stress concentration and interface separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bending reinforcement material is coated on the bend of the circuit substrate to reduce stress, then the structural reliability is improved, but the material adhesion is poor leading to interface separation and circuit breakage
Solution Approach 1:
The patent applies composite materials by combining a plastic substrate with a metal foil layer (such as aluminum or copper foil) to form a multi-layer structure. The metal foil provides tensile strength and prevents cracking, while the plastic substrate provides flexibility and bendability. This composite structure resolves the contradiction by integrating materials with complementary properties to achieve both high strength and good adhesion.
Solution Approach 2:
The patent uses thin film structures including a plastic substrate, metal foil layer, and sealant layers that are deposited or bonded in sequence. These thin films are designed to be flexible and conform to the bending substrate while maintaining strong interlayer adhesion through controlled deposition processes and appropriate material selection, preventing interface separation during bending.
2Reliability
If a uniform reinforcement material with suitable thickness is adopted to reduce stress, then the circuit breakage is avoided, but the border thickness increases
Solution Approach 1:
The patent applies local quality by placing the metal foil reinforcement layer specifically at the bending portion of the circuit substrate where stress concentration occurs, rather than uniformly across the entire substrate. The sealant is also applied locally at the periphery to seal gaps. This localized reinforcement provides necessary strength while minimizing the overall border thickness.
Solution Approach 2:
The patent employs thin film materials with controlled thicknesses that provide sufficient reinforcement without excessive bulk. The metal foil and plastic substrate layers are designed as thin films that flexibly conform to the substrate geometry while maintaining structural integrity, enabling slim border design without compromising circuit durability.
3Length of stationary object
If the display medium layer is shrunk to form a space for sealing, then the slim border is achieved, but the sealing complexity increases
Solution Approach 1:
The patent merges the sealing function with the existing structural layers by using the plastic substrate and metal foil layer as both structural components and sealing elements. The sealant is integrated into the multi-layer structure, filling gaps between layers and components. This merging approach achieves effective sealing while maintaining a slim border design and reducing overall structural complexity.
Solution Approach 2:
The patent introduces sealant as an intermediary material that fills gaps and seals spaces between the display medium layer, conductive film, touch panel, and reinforcing structure layer. The sealant acts as a mediator that creates waterproof and dust-proof barriers while accommodating the slim border geometry, simplifying the sealing process rather than increasing complexity.
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
Enhances structural reliability by preventing circuit damage and interface separation, allowing the device to meet the design requirement of a slim border with improved durability.
Implementation Method 1
an adhesive layer, which is disposed between the driving substrate, the display medium layer, the conductive film, the touch panel and the reinforcing structure layer
Data Source
AI summary
A touch display device includes a driving substrate, a display medium layer, a conductive film, a touch panel, a circuit board, a reinforcing structure layer and a light guide plate. The driving substrate includes a first portion, a second portion and a bending portion connecting the first portion and the second portion. The display medium layer is disposed on the first portion. The conductive film is disposed on the first portion and located on the display medium layer. The touch panel is disposed on the first portion and located on the conductive film. The circuit board is disposed on the second portion. The reinforcing structure layer is disposed on the bending portion and extends to the first portion to seal the space. The light guide plate is disposed on the first portion.