Touch sensor panel
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Solution Overview
Problem
Capacitive touch screens struggle to detect touch inputs with minor capacitance variations, such as those made by stylus pens, and have high manufacturing costs due to complex electrode architectures, which can lead to short-circuits and visibility issues with etched and non-etched parts.
Innovation Solution
A touch sensor panel with a single-layer electrode pattern featuring vertical and horizontal electrodes, including dummy electrodes to prevent short-circuits and improve visibility, while maintaining high sensing resolution and robustness against noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer electrode pattern is used to simplify manufacturing, then manufacturing complexity is reduced, but electrodes connected to different channels may short-circuit due to small distances between adjacent electrodes
Solution Approach 1:
A partition wall structure is introduced as an intermediary element between adjacent electrodes connected to different channels. This partition wall prevents direct contact and short-circuiting between electrodes while maintaining the single-layer electrode pattern's manufacturing simplicity. The partition wall acts as a physical barrier that isolates electrical channels without requiring complex multi-layer structures.
2Reliability
If the distance between adjacent electrodes is widened to prevent short-circuits, then reliability is improved, but the electrode pattern becomes visible to the naked eye due to transmittance differences
Solution Approach 1:
The electrode structure is segmented into multiple components: adjacent electrodes connected to different channels are divided by partition wall structures. This segmentation allows each electrode to maintain its functional integrity while the partition walls prevent short-circuits. The segmented design enables closer electrode spacing without compromising reliability, thereby maintaining optical uniformity and preventing visible patterns.
3Adaptability or versatility
If a double-layer electrode architecture is used to detect multi-touch input, then sensing capability is improved, but fabrication complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the functionality of multiple electrode layers into a single-layer electrode pattern. By using partition wall structures to create electrically isolated regions within the same layer, the design achieves multi-touch detection capability without requiring separate electrode layers. This combining approach maintains sensing versatility while significantly reducing fabrication complexity and manufacturing cost.
4Measurement precision
If the distance between electrodes is reduced to increase sensing resolution, then measurement precision is improved, but the risk of short-circuits due to etching errors or foreign material infiltration increases
Solution Approach 1:
Partition wall structures are constructed beforehand between adjacent electrodes as a preventive measure. These partition walls serve as a cushioning barrier that compensates for potential manufacturing variations such as etching errors or foreign material infiltration. By providing this protective structure in advance, the design enables closer electrode spacing for higher sensing resolution without proportionally increasing short-circuit risk.
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 solution enables precise touch location detection, reduces defect rates, and enhances image visibility by preventing electrode short-circuits and noise interference, while simplifying manufacturing and reducing costs.
Implementation Method 1
A capacitive touch screen may detect a touch location based on a capacitance variation resulting from a user's touch on the front surface of a display window thereof
Data Source
AI summary
A touch sensor panel used for a display device is provided. The touch sensor panel can precisely determine a touch location with a given area of electrodes, can reduce the number of channels required, and can reduce the influence of noise. In addition, the touch sensor panel can improve sensing resolution with a given number of electrode channels, can be robust against noise, and can improve linearity by precisely determining a touch location and visibility of displayed image by dummy electrodes.