Capacitive Handle Input Layout for Reliable Position Detection
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Solution Overview
Problem
Capacitive coupling between a handling means and a capacitive detection device, such as a touchscreen, is unreliable due to misalignment of the position indicator's path with the electrode structure, leading to inconsistent position detection.
Innovation Solution
A non-rule-compliant partial region is introduced in the grid structure of the detection surface, offsetting junction points to minimize the distance between the position indicator's path and the junction points, ensuring improved capacitive coupling and position detection across the entire surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a regular grid structure of array electrodes is used, then the device complexity is reduced and manufacturing is simplified, but the capacitive coupling between the position indicator and the electrode structure becomes unreliable due to path misalignment
Solution Approach 1:
The patent applies local quality by creating a non-rule-compliant partial region within the grid structure where junction points are specifically offset to align with the position indicator's path. This localized modification improves capacitive coupling reliability only in the critical area where the position indicator moves, while the rest of the grid maintains its simple regular structure for easy manufacturing.
2Measurement precision
If the grid structure is modified to improve position detection accuracy, then the measurement precision is improved, but the manufacturing precision requirements increase due to offset junction points
Solution Approach 1:
The non-rule-compliant partial region is limited to a small portion of the overall grid, concentrating the manufacturing precision requirements only in the area where the position indicator's path passes. The majority of the grid maintains standard manufacturing tolerances, thus the increased precision requirements are localized and more manageable.
Solution Approach 2:
Instead of modifying the entire grid structure, the patent applies the non-rule-compliant design only to a partial region where it is most needed for position detection accuracy. This partial modification approach reduces the overall manufacturing complexity while achieving the desired measurement precision improvement.
3Measurement precision
If junction points are offset from their regular positions, then the capacitive coupling is improved for better position detection, but the device complexity increases due to the irregular grid structure
Solution Approach 1:
The irregular junction point positions are confined to a non-rule-compliant partial region, while the rest of the grid maintains its simple regular pattern. This localized complexity improvement strategy enhances position detection reliability only where necessary, without making the entire device complex.
Solution Approach 2:
The grid structure is effectively segmented into a regular grid portion and a non-rule-compliant partial region. This segmentation allows the complex, offset junction points to exist only in the specific area needed for improved capacitive coupling, while the majority of the device maintains structural simplicity.
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 configuration enhances capacitive coupling and position detection accuracy by aligning the position indicator with more junction points, improving the reliability of positional information and movement tracking.
Implementation Method 1
a capacitive coupling between the handling means, particularly of the position indicator provided therein, and the first array of array electrodes is required
Implementation Method 2
form, by means of the first array of array electrodes, an associated electric measuring field array for the spatially resolving detection of a capacitive influence
Data Source
AI summary
An input device includes a capacitive detection device, which has a detection surface while forming a first array of array electrodes associated with the detection surface, that are arranged so as to cross one another several times while being electrically insulated to form one junction point at the locations where they cross one another; an electronic evaluation unit, which is electrically connected to the array electrodes to form an associated electric measuring field array for the spatially resolving detection of a capacitive influence on the detection surface; a handling means mounted on the detection surface movable along an adjustment path parallel to the detection surface to perform an operating input by a manually effected movement along the adjustment path; and at least one position indicator moved along with the handling means to capacitively influence at least one measuring field of the measuring field array.