Touch Panel Conductive Bridge Coating for Reflection-Free Visibility
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Solution Overview
Problem
Conventional touch panels with conductive bridges reflect light, causing visual discomfort due to the formation of light spots, which creates a visual difference that affects user experience.
Innovation Solution
A laminated anti-reflective layer with specific refractive index layers is applied to the conductive bridge, comprising a first refractive index layer with a lower refractive index than the conductive bridge, a second refractive index layer with a higher refractive index, and a third refractive index layer with a lower refractive index than the second, along with a protection layer, to reduce reflectivity and make the conductive bridge invisible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive bridge made of lightproof material with high reflectivity (such as molybdenum, aluminum) is used, then electrical connection between sensing pads is achieved, but visual discomfort occurs due to light reflection forming light spot areas
Solution Approach 1:
The patent applies a multi-layer composite structure consisting of a conductive bridge layer and an anti-reflective layer. The conductive bridge layer provides electrical connection functionality, while the anti-reflective layer (comprised of materials with specific refractive indices) reduces light reflection. This composite structure resolves the contradiction by combining materials with different optical and electrical properties to simultaneously achieve both electrical connectivity and reduced visual discomfort.
Solution Approach 2:
The patent changes the optical parameters of the conductive bridge structure by introducing layers with specific refractive indices. The anti-reflective layer is designed with refractive indices that differ from both the conductive bridge layer and the surrounding medium, optimizing light transmission and minimizing reflection. This parameter optimization allows the conductive bridge to maintain its electrical function while reducing harmful light reflection effects.
2Reliability
If a conductive bridge with high reflectivity is used, then electrical insulation from sensing arrays is achieved, but visual difference appears in the touch screen
Solution Approach 1:
The patent uses a composite structure where the anti-reflective layer is applied over the conductive bridge. This composite approach maintains the electrical insulation properties of the conductive bridge while the anti-reflective layer modifies the optical properties to reduce visual differences in the touch screen display.
3Object-affected harmful factors
If an anti-reflective layer with laminated structure is applied, then reflectivity is reduced and conductive bridge becomes invisible, but device complexity increases
Solution Approach 1:
The anti-reflective layer is segmented into multiple sub-layers, each with specific refractive index characteristics. This segmentation allows for optimized light transmission at each interface, achieving superior anti-reflective performance. While this increases structural complexity, it can be manufactured using standard multi-layer deposition techniques in touch panel production.
Solution Approach 2:
The patent optimizes the refractive index parameters of each layer in the anti-reflective structure to achieve minimal reflectivity. By carefully selecting and controlling the refractive indices and thicknesses of each layer, the conductive bridge becomes effectively invisible while maintaining a manageable structural complexity that can be integrated into existing touch panel manufacturing processes.
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 anti-reflective layer effectively reduces reflectivity, eliminating the visual difference and making the conductive bridge invisible, thereby enhancing user experience by minimizing light spot formation.
Implementation Method 1
The anti-reflective layer comprises: a first refractive index layer covering the conductive bridge and a second refractive index layer located on the first refractive index layer, wherein refractive index of the first refractive index layer is lower than that of the conductive bridge and refractive index of the second refractive index layer is higher than that of the first refractive index layer
Data Source
AI summary
The present disclosure relates to a touch panel with a conductive bridge structure and a manufacturing method thereof, wherein an anti-reflective layer is disposed on the conductive bridge. According to the touch panel with a conductive bridge structure and the manufacturing method provided in the present disclosure, the problem of visual difference of a touch screen can be eliminated and the manufacturing process can be reduced.