Position Outputting Device Boundary Area Capacitance Validation
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Solution Overview
Problem
Conventional information processing devices with sensor panels suffer from usability issues due to invalidation of coordinates detected in the outer periphery of the operational area, leading to positional deviations and bent trajectories when a user's fingertip overlaps the edge of the operational area.
Innovation Solution
A position outputting device with sensing electrodes and a control unit that detects capacitance changes to determine whether to output position data based on peak values within specific sections, ensuring accurate data output by differentiating between inner and boundary area capacitance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If coordinates detected in the outer periphery (boundary area) are invalidated, then positional accuracy in the inner area is improved, but usability and operational range are reduced
Solution Approach 1:
The patent applies different processing rules to different spatial zones: boundary area sections use strict peak validation while inner area sections use differential capacitance validation. This local differentiation allows the system to maintain high positional accuracy in the inner area while accepting and processing boundary area inputs, thus resolving the contradiction between measurement precision and ease of operation.
Solution Approach 2:
The patent changes the validation parameter from binary (valid/invalid) to continuous (capacitance difference threshold). By comparing the difference between peak capacitance and neighboring capacitance values against a threshold, the system can dynamically determine position validity, allowing flexible handling of boundary cases and improving both accuracy and usability simultaneously.
2Measurement precision
If coordinates in the boundary area are invalidated, then positional deviations are suppressed, but the operational area is reduced
Solution Approach 1:
The patent implements location-specific validation: boundary area sections require the capacitance difference to be below a threshold, while inner area sections require the peak to be sufficiently separated from boundary sections. This allows the full operational area to be utilized while maintaining positional accuracy through differentiated processing rules.
Solution Approach 2:
Instead of invalidating boundary area coordinates as conventional systems do, the patent inverts the approach by validating them through capacitance difference comparison. This inversion allows boundary area inputs to be accepted and processed, maintaining full operational area while still suppressing positional deviations through appropriate threshold-based validation.
3Device complexity
If simple invalidation of boundary coordinates is used, then device complexity is reduced, but usability deteriorates
Solution Approach 1:
The patent introduces a capacitance difference threshold parameter to replace simple binary invalidation. By comparing the difference between peak and neighboring capacitance values against this threshold, the system achieves more nuanced position validation that improves usability while maintaining manageable processing complexity through a single additional comparison 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
The device improves usability by suppressing positional deviations and accurately outputting position data even when the fingertip is near the outer edge of the operational area, enhancing the reliability of user interactions.
Implementation Method 1
a position detector configured to detect a position where the object approaches or touches the operational surface based on capacitances obtained in a plurality of sections
Data Source
AI summary
A position outputting device that includes sensing electrodes disposed along an operational surface operated by an object, the operational surface having an operational area, the operational area having a boundary area and an inner area, a position detector configured to detect a position where the object touches the operational surface based on capacitances, the sections including first sections and second sections, the first sections being located in the inner area, the second sections being located in the boundary area, and a determiner configured to determine to output the position data in response to the peak value being detected in one of the first sections and if the difference between the peak value detected in the one of the first sections and the capacitance detected in one of the second sections neighboring the one of the first sections is not more than a predetermined value.