Capacitive Input Device Orthogonal Electrode Segmentation
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Solution Overview
Problem
Existing input devices, such as touchpads and touch screens, face challenges in accurately detecting user inputs across varying dimensions and orientations due to limitations in capacitive sensing technologies, particularly in distinguishing between contact and non-contact inputs, and in efficiently processing multi-dimensional input data.
Innovation Solution
The implementation of a capacitive input device with a unique sensor electrode pattern featuring a first plurality of transmitter electrodes oriented along one axis and a second plurality of receiver electrodes oriented along a different axis, utilizing transcapacitive and absolute capacitive sensing methods to detect inputs across a display region, with the receiver electrodes divided into subsets to form an ohmic seam, allowing for independent sensing and improved spatial interpolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensor electrodes extend fully across both dimensions of the display region, then complete coverage sensing is achieved, but manufacturing complexity and signal interference increase
Solution Approach 1:
The sensor electrodes are segmented into two distinct groups: transmitter electrodes extending fully across the first dimension and receiver electrodes extending fully across the second dimension. This segmentation allows each electrode type to specialize in one dimension, achieving complete sensing coverage while reducing the complexity that would result from attempting to use single electrodes for both dimensions.
Solution Approach 2:
The patent transitions from a one-dimensional electrode arrangement to a two-dimensional orthogonal arrangement. By introducing receiver electrodes oriented perpendicular to the transmitter electrodes, the system achieves comprehensive two-dimensional sensing coverage without requiring each individual electrode to span both dimensions, thus reducing manufacturing complexity.
2Measurement precision
If transmitter and receiver electrodes are closely spaced, then sensing resolution is improved, but capacitive coupling and signal interference increase
Solution Approach 1:
The patent applies different functional qualities to different electrode types: transmitter electrodes are optimized for signal transmission along the first dimension, while receiver electrodes are optimized for signal reception along the second dimension. This local differentiation of electrode functions allows for reduced spacing and improved resolution while managing capacitive coupling through functional specialization.
3Adaptability or versatility
If orthogonal electrode arrangement is implemented, then multi-dimensional input detection is enabled, but manufacturing precision requirements increase
Solution Approach 1:
The orthogonal electrode arrangement creates a universal sensing framework where transmitter electrodes handle one dimension and receiver electrodes handle the perpendicular dimension. This multi-functional configuration enables detection of inputs across both dimensions using a standardized orthogonal pattern, making the system adaptable to various input types while maintaining consistent manufacturing requirements.
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 the accuracy and usability of input devices by enabling effective detection of inputs across multiple dimensions, distinguishing between contact and non-contact events, and improving the granularity of capacitive pixels, thereby enhancing user interaction with electronic systems.
Implementation Method 1
A proximity sensor device typically includes a sensing region, often demarked by a surface, in which the proximity sensor device determines the presence, location and/or motion of one or more input objects
Implementation Method 2
utilizing transcapacitive and absolute capacitive sensing methods to detect inputs across a display region
Data Source
AI summary
An input device comprises a first and second pluralities of capacitive sensor electrodes. The first plurality of capacitive sensor electrodes is oriented along a first axis, disposed in a first layer, and configured to update a display screen of the input device. The second plurality of capacitive sensor electrodes is oriented along a second axis that differs from the first axis. A display region of the display screen has a first dimension along the first axis and a second dimension the second axis. At least one sensor electrode of the first plurality of capacitive sensor electrodes extends fully across the first dimension of the display region. Individual sensor electrodes of the second plurality of capacitive sensor electrodes do not extend fully across the second dimension of the display region.