Transparent Display Laminate With Intermediate Layer for Antenna Levelness
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Solution Overview
Problem
In mobile terminal equipment, the reduction in size and thickness limits the space for antennas, leading to unsatisfactory radio wave sensitivity and challenges in maintaining levelness between conductive mesh layers and ground layers using flexible adhesives, which affects antenna characteristics.
Innovation Solution
An image display device laminate with a wiring board having a transparent substrate, a mesh wiring layer, and adhesive layers, where an intermediate layer is used between the wiring board and adhesive layers to improve antenna characteristics and reduce visual recognition, with specific refractive index and thickness conditions to minimize reflection and enhance transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a transparent adhesive layer such as OCA is used to fix the conductive mesh layer, then the mesh layer can be attached to another layer, but it is difficult to maintain levelness between the conductive mesh layer and ground layer, affecting antenna characteristics
Solution Approach 1:
A levelness maintenance layer is introduced as an intermediary component between the transparent adhesive layer and the conductive mesh layer. This intermediate layer serves as a mediator that prevents the adhesive layer from directly contacting the mesh layer, thereby maintaining levelness and improving antenna characteristics while still allowing attachment functionality
2Length of moving object
If the substrate thickness is reduced to achieve thinner mobile terminal equipment, then the overall device thickness is reduced, but the visual recognition of the wiring board increases
Solution Approach 1:
The levelness maintenance layer is applied locally at specific positions where levelness needs to be maintained, rather than uniformly across the entire structure. This localized application maintains the thin profile of the device while providing visual obscuration and levelness maintenance where most needed
3Adaptability or versatility
If flexible adhesive materials are used to fix the conductive mesh layer, then the adhesive can accommodate manufacturing variations, but it is difficult to maintain sufficient levelness between layers
Solution Approach 1:
The levelness maintenance layer acts as a mediator between the flexible adhesive layer and the conductive mesh layer. It allows the adhesive to remain flexible for manufacturing adaptability while the maintenance layer itself provides the rigid structure needed to ensure sufficient levelness between layers
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 solution improves antenna characteristics by enhancing radio wave transmission/reception while making the wiring board less visually recognizable, maintaining transparency and reducing the visibility of the substrate, thus addressing the limitations of space and sensitivity in compact mobile devices.
Implementation Method 1
an intermediate layer which is situated in at least one of a position between the wiring board and the first adhesive layer and a position between the wiring board and the second adhesive layer
Data Source
AI summary
An image display device laminate includes a wiring board that has a substrate and a mesh wiring layer disposed on a first face of the substrate, a first adhesive layer situated on the first face side of the substrate, a second adhesive layer situated on the second face side of the substrate, and an intermediate layer situated in at least one of a position between the wiring board and the first adhesive layer and a position between the wiring board and the second adhesive layer. The substrate has transparency. A partial region of the substrate is disposed in a partial region between the first adhesive layer and the second adhesive layer.