Capacitive Sensing Pattern Electrode Interleaving
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Solution Overview
Problem
Current capacitive sensing devices face limitations in accurately detecting the presence and positioning of input objects due to increased pitch between sensor electrodes, leading to erroneous interpolation calculations and reduced signal response above the noise floor.
Innovation Solution
A capacitive sensing pattern with interleaved receiver and transmitter sensor electrodes, featuring multiple crossings and varying widths, enhances signal overlap above the noise floor, enabling accurate detection of input objects even with increased electrode pitch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If increased pitch between sensor electrodes is used, then device complexity is reduced and manufacturing is easier, but measurement precision deteriorates due to erroneous interpolation calculations and reduced signal response
Solution Approach 1:
The sensor electrode array is segmented into multiple groups, where each group contains electrodes with different orientations. This segmentation allows each subset to contribute independently to the signal, enabling accurate detection even with larger pitch between individual electrodes by combining signals from multiple oriented groups.
Solution Approach 2:
The patent introduces a new dimension of electrode orientation by arranging electrodes in multiple groups with different orientations (e.g., first group oriented in one direction, second group oriented in another direction). This dimensional approach to electrode arrangement enhances signal response and enables accurate interpolation calculations even when pitch between electrodes is increased.
2Device complexity
If increased pitch between sensor electrodes is used, then device complexity is reduced, but signal response above the noise floor deteriorates
Solution Approach 1:
The patent merges signals from multiple electrode groups with different orientations to create a composite signal response. By combining the outputs from the first group of sensor electrodes and the second group of sensor electrodes, the system achieves reliable signal response above the noise floor even when the pitch between individual electrodes is increased, thereby reducing device complexity.
3Ease of manufacture
If conventional sensor electrode patterns are used, then manufacturing is simpler, but detection accuracy deteriorates due to erroneous interpolation calculations
Solution Approach 1:
The patent applies local quality by assigning different orientations to different groups of sensor electrodes based on their local positioning within the array. The first group of sensor electrodes has a first orientation suitable for detecting inputs in certain regions, while the second group has a second orientation for complementary regions, thereby improving overall positioning accuracy without complicating manufacturing.
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 proposed sensing pattern improves detection accuracy and signal response, allowing for precise localization of input objects within the sensing region, even at larger electrode pitches, by increasing the contribution of neighboring electrodes above the noise floor.
Implementation Method 1
capacitive sensing devices are widely used in modern electronic devices
Implementation Method 2
capacitive sensing pattern comprises a plurality of first sensor electrodes oriented substantially parallel to a first axis proximate to a sensing region
Data Source
AI summary
A capacitive input device comprises a plurality of receiver electrodes and a plurality of transmitter electrodes. The plurality of receiver sensor electrodes is oriented substantially parallel to a first axis proximate to a sensing region of the capacitive input device. The plurality of transmitter sensor electrodes is oriented substantially parallel to a second axis proximate to the sensing region and configured to be capacitively coupled with the plurality of receiver sensor electrodes. At least one of a receiver sensor electrode of the plurality of receiver sensor electrodes and a transmitter sensor electrode of the plurality of transmitter sensor electrodes is disposed in a configuration forming multiple crossings with a line that is perpendicular to the first axis, the multiple crossings occurring proximate to the sensing region.