Irregular Capacitive Sensor Coordinate Transformation
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Solution Overview
Problem
Capacitive sensors with non-rectangular shapes, such as irregular geometries, often produce inaccurate touch event coordinates when used with touch controllers pre-configured for rectangular shapes, leading to incorrect location identification of touch events.
Innovation Solution
A method to distort the geometry of a capacitive sensor design from a regular to an irregular shape, involving processes like stretching, narrowing, or skewing, while maintaining uniform node areas and numbers of sensor nodes, and using coordinate transforms to adjust touch event location identifiers accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If capacitive sensors use irregular geometries to match non-rectangular touch surfaces, then adaptability to different device designs is improved, but coordinate accuracy for touch event location identification deteriorates
Solution Approach 1:
The patent applies asymmetry by intentionally distorting the regular rectangular sensor geometry into irregular shapes that match non-rectangular touch surfaces. The sensor design includes irregularly shaped electrode segments and non-uniform node distributions that conform to the specific contours of the touch surface, enabling accurate touch detection on devices with curved or uniquely shaped displays while maintaining coordinate precision through corresponding distortion of the coordinate transformation matrix.
Solution Approach 2:
The patent employs parameter changes by modifying geometric parameters of the sensor design, including node spacing, electrode dimensions, and segment shapes. The coordinate transformation matrix is dynamically adjusted based on the specific irregular geometry of the sensor, allowing the system to adapt to different non-rectangular configurations while preserving measurement accuracy through mathematically compensated coordinate mappings.
2Adaptability or versatility
If capacitive sensors are distorted from regular to irregular geometry, then adaptability to various device designs is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the irregularly shaped sensor into multiple discrete electrode segments and node groups. Each segment can be independently manufactured and positioned, simplifying the fabrication process. The segmentation allows for modular assembly where standard manufacturing techniques can be used to create individual components that are then combined to form the complete irregular geometry, reducing overall manufacturing complexity.
Solution Approach 2:
The patent employs preliminary action by pre-calculating and pre-defining the coordinate transformation matrix and node mappings during the design phase. This preliminary configuration allows the irregular geometry to be manufactured using standard processes, as the complex coordinate relationships are established beforehand through computational design rather than requiring complex real-time adjustments during manufacturing or operation.
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
Enables reliable detection of touch events on capacitive sensors with irregular geometries by accurately mapping and transforming coordinates, ensuring consistent capacitance responses and accurate location identification.
Implementation Method 1
detecting capacitive changes indicative of a touch event
Data Source
AI summary
A method includes: changing a geometry of a capacitive sensor design from a first geometry to a second geometry, the second geometry different than the first geometry; and obtaining executable instructions to transform a location identifier of a touch event from a first location identifier associated with the first geometry to a second location identifier associated with the second geometry.