Galvanic bridges reduce supply line interference in touch screens
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Solution Overview
Problem
Existing touchscreen layer electrodes are susceptible to interfering signals in the edge region due to bundled supply lines, which affects the reliability of electrode arrays, especially as the number of electrode arrays increases.
Innovation Solution
The implementation of galvanic bridges connects electrode arrays within the transparent region, reducing the number of supply lines in the edge region and maintaining the thickness of the supply line bundle, thereby enhancing detection accuracy and reducing the impact of increased electrode arrays on the transparent region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of electrode arrays is increased to improve touch field coverage, then the area of the transparent region is improved, but the thickness of the supply line bundle increases causing interfering signals in the edge region
Solution Approach 1:
The electrode arrays are divided into two groups: first electrode arrays directly connected to supply lines, and second electrode arrays connected via galvanic bridges. This segmentation allows supply lines to be concentrated at specific locations rather than distributed across the entire edge region, reducing the bundle thickness and interfering signals while maintaining comprehensive touch field coverage through the bridged connections.
Solution Approach 2:
Galvanic bridges are introduced as intermediary elements to connect second electrode arrays to the first electrode arrays. These bridges serve as mediators that eliminate the need for direct supply line connections to all electrode arrays, thereby reducing the number and thickness of supply lines in the edge region while maintaining electrical connectivity across all touch fields.
2Adaptability or versatility
If supply lines are bundled to contact all electrode arrays, then all electrode arrays can be contacted, but the bundle thickness increases reducing reliability in the edge region
Solution Approach 1:
The contacting system is segmented into direct connections (supply lines to first electrode arrays) and indirect connections (galvanic bridges to second electrode arrays). This segmentation reduces the supply line bundle thickness at the edge region by eliminating redundant direct connections, thereby improving reliability while maintaining the ability to contact all electrode arrays through the combination of direct and bridged connections.
3Object-affected harmful factors
If supply lines are reduced to improve edge region reliability, then interfering signals are reduced, but the number of electrode arrays that can be contacted is limited
Solution Approach 1:
Galvanic bridges function as intermediaries that extend the reaching capability of the reduced supply line system. By using these bridge mediators, a limited number of supply lines can indirectly contact a larger number of electrode arrays through the first electrode arrays, thereby maintaining comprehensive contacting capability while reducing supply line-related interfering signals in the edge region.
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 solution significantly reduces the number of supply lines in the edge region, improving touch resolution and allowing for a higher number of touch fields without compromising detection accuracy, even with an increased number of electrode arrays.
Implementation Method 1
second electrode arrays are connected to first electrode arrays via galvanic bridges
Data Source
AI summary
A layer electrode for touchscreens, in particular one which is suitable for the construction of capacitive touchscreens, wherein the detection accuracy of the touchscreen is virtually independent of an increase in the number of electrode arrays in the touchscreen. This is achieved in that, within the transparent field of view of the touchscreen, conductivity centres are formed through first electrode arrays which are connected directly to supply lines into the edge region and to a controller.