Multilayer Touch Panel Connector for Edge Visibility
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Solution Overview
Problem
Conventional touch panels with light shielding films in the edge region suffer from visibility issues due to reflections and permittivity mismatches, leading to deteriorated radio wave characteristics.
Innovation Solution
A touch panel design featuring a multilayer structure connector with a color layer and shield layer, where dielectric layers are thicker than metal layers, alternately laminated to reduce edge thickness and maintain permittivity similar to glass while providing light shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light shielding film with thickness of 5 μm to 20 μm is formed on the cover substrate by printing, then light shielding capability is achieved, but a gap is produced between the cover substrate and touch panel substrate causing reflections and lowering visibility
Solution Approach 1:
The patent changes the thickness parameter of the light shielding film from conventional 5-20 μm to 1-5 μm, and transforms it into a multilayer structure with alternating metal and dielectric layers. This parameter change eliminates the gap between substrates while maintaining light shielding capability, thereby preventing reflections and improving visibility.
Solution Approach 2:
The patent creates a composite light shielding film consisting of multiple layers including metal layers and dielectric layers alternately laminated. This composite structure provides effective light shielding while maintaining a thin overall thickness that prevents gap formation and reduces reflections between the cover substrate and touch panel substrate.
2Object-affected harmful factors
If a conductor such as metal is provided in the edge region, then light shielding is achieved, but permittivity mismatch occurs with the cover substrate or panel unit deteriorating radio wave characteristics
Solution Approach 1:
The patent employs a composite structure where metal layers are alternately laminated with dielectric layers having dielectric constants close to those of the cover substrate or touch panel substrate. This composite approach maintains light shielding capability while minimizing permittivity mismatch, thereby preserving radio wave transmission characteristics.
Solution Approach 2:
The patent applies different materials with specific dielectric properties to different regions of the light shielding film. The dielectric layers are selected to have dielectric constants matching the surrounding substrates, creating local permittivity compatibility that prevents radio wave distortion while maintaining overall light shielding effectiveness.
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
This design enhances visibility by eliminating reflections and maintains radio wave transmission, ensuring the edge region has the same permittivity as glass while offering light shielding capabilities.
Implementation Method 1
a shield layer which is formed from a multilayer structure, in which a dielectric layer and a metal layer which is thinner than the dielectric layer are alternately laminated
Implementation Method 2
make the edge region have the same permittivity as that of a substrate that is formed from glass or the like
Data Source
AI summary
A touch panel of the present invention includes: a cover substrate; a connector being provided on an area of the cover substrate other than a display area, and including a color layer and a shield layer, the shield layer being formed from a multilayer structure, the multilayer structure being configured so that a metal layer and a dielectric layer which is thicker than the metal layer are alternately laminated; and a touch panel substrate being arranged to face the cover substrate with the connector interposed therebetween.