Single-Layer Touch Panel Sensing Structure with Interleaved Electrodes
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Solution Overview
Problem
Current single-layer capacitive touch sensors face challenges in accurately determining touch locations, especially in multi-touch applications, and require extensive wiring, increasing the panel's area and manufacturing costs.
Innovation Solution
A novel sensing structure for touch panels is introduced, featuring a substrate with first, second, and third electrode groups, where electrodes and wires are strategically interleaved and insulated to reduce wiring area and maintain accurate touch location detection without increasing the number of wires, utilizing a single-layer design with indium-tin-oxide thin-film electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dual-layer capacitive touch sensor is used, then accurate touch location detection is achieved, but the manufacturing cost increases due to extensive wiring
Solution Approach 1:
The patent transitions from a dual-layer electrode structure (X-axis electrodes on one side, Y-axis electrodes on the other side) to a single-layer structure where both X-axis and Y-axis electrodes are disposed on the same side of the substrate. This dimensional reorganization eliminates the need for wiring on both sides of the substrate, reducing wiring complexity while maintaining the orthogonal electrode arrangement necessary for accurate touch location detection
Solution Approach 2:
The patent merges the X-axis and Y-axis electrode layers into a single layer on one side of the substrate. By combining what were previously separate layers into one integrated layer, the patent reduces the overall wiring complexity and manufacturing cost while preserving the functional separation of X and Y axis electrodes through spatial arrangement and insulation
2Area of stationary object
If a single-layer capacitive touch sensor is used, then wiring area is reduced, but multi-touch application performance deteriorates
Solution Approach 1:
The patent applies different properties to different regions of the electrode structure. Specifically, it uses insulated spacing between adjacent X-axis and Y-axis electrodes in the single layer, allowing each electrode type to maintain its functional characteristics while coexisting in the same layer. This local differentiation enables accurate multi-touch detection while keeping all wiring on one side
Solution Approach 2:
The patent segments the single electrode layer into distinct X-axis electrode groups and Y-axis electrode groups that are interleaved and insulated from each other. This segmentation allows the single layer to perform the function of what would traditionally require two separate layers, maintaining measurement precision for multi-touch applications while reducing wiring area
3Reliability
If indium-tin-oxide transparent conductive thin film is used, then transparent electrode performance is achieved, but manufacturing cost increases
Solution Approach 1:
The patent combines both X-axis and Y-axis electrodes into a single layer using the same indium-tin-oxide transparent conductive thin film material. This merging reduces the total amount of expensive transparent conductive material required compared to dual-layer structures, while maintaining the necessary electrode performance for accurate touch detection
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 design allows for accurate touch location detection in a reduced panel area and lower manufacturing costs by minimizing wiring and optimizing electrode placement, enhancing linearity and reducing the overall size of the touch panel.
Implementation Method 1
When a user touches the panel using his finger, the proximity of the finger changes the coupling capacitance of the sensing structure. The capacitive touch panel can analyze changes in capacitance of the sensing structure and thus determining the touch location of the finger.
Data Source
AI summary
The present invention relates to a sensing structure of touch panel, which comprises a plurality of first electrode groups are located on a first side of a substrate. The bottom of each first electrode is located on the first side and extends towards a second side. A plurality of extended electrode groups are connected to the plurality of first electrode groups, respectively. The bottom of each extended electrode is located on the second side and extends towards the first side. The plurality of second electrode groups are located on the substrate. A first sub-electrode of each second electrode is interleaved with and insulated electrically from each extended electrode. The plurality of third electrode groups are located on the substrate and have a plurality of third electrodes. A first sub-electrode of the third electrode is interleaved with and insulated electrically from the second sub-electrode of the second electrode.