Touch Screen Panel With Fine Metal Mesh And Protection Layers
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Solution Overview
Problem
Capacitive touch screen panels using opaque metal mesh patterns face challenges with durability and manufacturing costs, as they are prone to damage from external impacts and have high reflectivity differences, leading to defects and increased costs compared to indium tin oxide (ITO) solutions.
Innovation Solution
A touch screen panel design featuring first and second touch electrodes with fine mesh patterns formed by crossing metal wirings, supported by protection layers to enhance durability and transmissivity, and connected by a transparent conductive material for improved electrical conductivity and reduced reflectivity issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If opaque metal mesh patterns are used for touch electrodes, then electrical conductivity is improved and manufacturing cost is reduced, but durability deteriorates due to damage from external impacts
Solution Approach 1:
The patent uses a composite structure combining transparent conductive material (such as ITO) and opaque metal mesh pattern in the same touch electrode layer. This composite approach allows the electrode to maintain high electrical conductivity from the metal mesh while the transparent conductive material provides durability and protects against impact damage, resolving the contradiction between conductivity and strength.
2Ease of manufacture
If opaque metal mesh patterns are used for touch electrodes, then manufacturing cost is reduced, but transmissivity deteriorates due to light blocking
Solution Approach 1:
The patent applies local quality by using opaque metal mesh pattern only in specific regions where high electrical conductivity is needed, while using transparent conductive material in regions where light transmission is prioritized. This localized application allows the touch electrode to achieve cost-effectiveness through metal mesh while maintaining adequate transmissivity through transparent material, resolving the contradiction between manufacturing cost and illumination intensity.
3Reliability
If opaque metal mesh patterns are used for touch electrodes, then electrical conductivity is improved, but visual quality deteriorates due to reflectivity differences causing stains
Solution Approach 1:
The patent employs a composite material structure where transparent conductive material and opaque metal mesh pattern are combined. The transparent conductive material covers and masks the metal mesh pattern, reducing reflectivity differences and preventing the appearance of stains or visual defects. This composite approach maintains the high electrical conductivity of the metal mesh while improving visual quality by eliminating the staining effect.
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 design decreases defects and manufacturing costs by increasing transmissivity and durability, while maintaining high electrical conductivity, thus providing a cost-effective and reliable touch screen solution.
Implementation Method 1
refractive indices differing to compensate for transmissivity decreases
Data Source
AI summary
A touch screen panel includes: a first touch electrode disposed on a substrate and extending in a first direction, the first touch electrode including first mesh patterns formed of crossing metal wirings including fine patterns; and a second touch electrode disposed on the substrate and extending in a second direction crossing the first direction, the second touch electrode including second mesh patterns formed of crossing of metal wirings including fine patterns.