Projected-Capacitive Electrode Layout Around Openings for Touch Resolution
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Solution Overview
Problem
Projected-capacitive touch detection systems face limitations in multi-touch recognition and spatial resolution due to geometric deviations from a strictly regular electrode pattern, particularly in large diagonal implementations and vehicle applications, where design constraints restrict resolution and usability.
Innovation Solution
An arrangement with an electrically insulating substrate featuring alternating conductive surfaces of regular shapes, allowing for non-compliant surface configurations near openings while maintaining minimum distances, which enhances touch detection resolution and supports multi-touch capabilities through mutual capacitance principles and software compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If openings are introduced in the substrate for fasteners or orientation aids, then design flexibility and user interface quality are improved, but geometric deviations from the regular electrode pattern occur, reducing touch detection resolution
Solution Approach 1:
The patent applies local quality by allowing geometric deviations only in specific local areas where openings are present, while maintaining the regular alternating pattern in all other regions. The electrode surfaces adjacent to openings are selectively deformed to accommodate the opening geometry, whereas electrodes in unaffected areas retain their standard regular shapes and spacing.
Solution Approach 2:
The electrode structure is segmented into regular regions and locally deformed regions. The evaluation unit processes touch detection data by identifying and compensating for deviations in specific local zones around openings, separating the treatment of affected electrodes from unaffected ones to maintain overall system resolution.
2Area of stationary object
If openings are introduced in the substrate for fasteners or orientation aids, then installation space and orientation aid placement are improved, but touch detection resolution at affected locations deteriorates
Solution Approach 1:
The evaluation unit implements feedback by continuously monitoring touch detection signals and identifying deviations caused by openings. When geometric deviations are detected in electrode patterns near openings, the system automatically compensates by adjusting the interpretation of capacitance changes, using the known opening locations and geometries to correct resolution errors.
Solution Approach 2:
The patent changes the geometric parameters of electrode surfaces adjacent to openings, allowing them to be deformed or repositioned to accommodate the opening. The evaluation unit相应地 adjusts its measurement parameters and thresholds for these specific electrode regions, modifying how capacitance values are interpreted in affected zones to maintain detection accuracy.
3Measurement precision
If a strictly regular electrode pattern is maintained, then touch detection resolution is maximized, but design constraints prevent optimal placement of orientation aids and fasteners
Solution Approach 1:
The patent applies local quality by allowing geometric deviations only in specific local areas where openings are present, while maintaining the regular alternating pattern in all other regions. The electrode surfaces adjacent to openings are selectively deformed to accommodate the opening geometry, whereas electrodes in unaffected areas retain their standard regular shapes and spacing.
Solution Approach 2:
The evaluation unit acts as an intermediary between the physically deformed electrode pattern and the touch detection algorithm. It translates the irregular geometric patterns into corrected coordinate systems, mediating between the physical reality of deformed electrodes and the computational requirements for accurate touch position calculation.
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 approach enables user-friendly, space-saving, and clear control surfaces for vehicles by retaining sensitivity and resolution despite geometric deviations, allowing for effective multi-touch detection and improved placement of orientation aids, thus enhancing user interaction without compromising sensitivity.
Implementation Method 1
Projected capacitive technology (pcap touch) detects touch by measuring the electrical capacitance at each addressable electrode. When a finger or conductive stylus approaches an electrode, its electromagnetic field is disturbed, changing its electrical capacitance.
Implementation Method 2
When a finger or conductive stylus approaches an electrode, its electromagnetic field is disturbed, changing its electrical capacitance.
Implementation Method 3
Mutual capacitance refers to the intended or unintended electrical capacitance between two charged objects. In projected capacitive touchpads (pcap touch), a counter-capacitance is intentionally created between the elements of rows and columns located near each intersection point.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to an arrangement for spatially resolving projected-capacitive touch detection comprising an electrically insulating substrate (5), having a plurality of electrically conductive surfaces of a first generic kind (1) and a second generic kind (2) arranged alongside one another on the substrate, wherein the surfaces within a generic kind regularly have a uniform surface formation, and wherein the surfaces of the first generic kind (1) are electrically interconnected in rows in order to form a plurality of transmitter electrodes (15), and the surfaces of the second generic kind (2) are electrically connected in columns in order to form a plurality of receiving electrodes (14), and the surfaces are arranged alternately in terms of generic kind, in a manner substantially forming a regular pattern (13) on account of their rule-conforming surface formation and positioning in accordance with generic kinds, such that the surface of one generic kind (6) is surrounded by a plurality of surfaces of the other generic kind (7) maintaining a minimum distance (3) in each case, wherein a perforation (4) is formed in the substrate (5) and at least one first surface (1b, 2a) of the first generic kind (1) or second generic kind (2) which adjoins the perforation (4) is provided which, with regard to its surface formation and/or positioning in accordance with generic kinds, is configured in a non-rule-conforming manner such that the predefined minimum distance (3) relative to in each case at least two closest neighbouring surfaces (1a, 1a') of the other generic kind is achieved.