Touch Screen Sensing Electrodes with Electrically Separated Regions
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Solution Overview
Problem
The increasing density of sensing lines in touch screens leads to electromagnetic interference between sensing electrodes, reducing touch sensitivity and uniformity.
Innovation Solution
The configuration of sensing electrodes, including their width, length, shape, number, and orientation, is altered to reduce electromagnetic interference, with electrically isolated portions varying in size based on distance from the pad unit to enhance sensitivity across the screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the density of sensing lines is increased to achieve smaller and higher resolution displays, then the number of sensing lines increases, but electromagnetic interference between sensing electrodes increases, reducing touch sensitivity and uniformity
Solution Approach 1:
The sensing electrodes are divided into multiple sensing regions (first sensing region, second sensing region, third sensing region) with different configurations. Each region has sensing lines arranged in different directions, allowing the system to maintain high resolution while reducing electromagnetic interference through regional differentiation.
Solution Approach 2:
Different sensing regions have different line configurations optimized for their specific locations. The first sensing region has lines extending in a first direction, the second sensing region has lines extending in a second direction, and the third sensing region has lines extending in a third direction. This local optimization reduces electromagnetic interference in each specific area while maintaining overall high resolution.
2Manufacturing precision
If the number of sensing lines is increased to improve resolution, then more sensing lines are disposed between adjacent sensing electrodes, but touch sensitivity uniformity decreases due to electromagnetic interference
Solution Approach 1:
The touch screen is divided into multiple sensing regions with distinct line configurations. By segmenting the sensing area into regions with different orientations, the patent maintains high resolution across the entire screen while ensuring uniform touch sensitivity through localized optimization of electromagnetic interference patterns.
Solution Approach 2:
The sensing lines in different regions are arranged asymmetrically with respect to each other (first direction, second direction, third direction). This asymmetric arrangement prevents uniform electromagnetic interference patterns that would otherwise cause sensitivity variations, thereby improving touch sensitivity uniformity while maintaining high resolution.
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 approach improves touch sensitivity and uniformity by minimizing electromagnetic interference and optimizing the distribution of sensing lines, resulting in a more effective touch screen performance.
Implementation Method 1
electromagnetic interference may occur between the sensing electrodes and the sensing lines in touch screen
Data Source
AI summary
A touch screen including a plurality of first sensing electrode columns having a plurality of first sensing electrodes, the plurality of first sensing electrode columns extending in one direction, and a plurality of second sensing electrode columns alternately disposed with the first sensing electrode columns, the plurality of second sensing electrode columns including a plurality of second sensing electrodes having a plurality of sub-electrodes. Sub-electrodes of one of adjacent second sensing electrodes are electrically connected to sub-electrodes of another of the adjacent second sensing electrodes. At least some of the first sensing electrodes include a first region and a second region electrically separated from the first region.