Operation Detection Device Coordinate Stability Control
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Solution Overview
Problem
Increased sensitivity in information input devices leads to unstable coordinates during hovering operations, reducing touch operability due to detection of fingers with large voltage drops as if they are hovering, even when they are not.
Innovation Solution
An operation detection device with a detection unit that calculates and sets reference coordinates based on physical quantity changes, and adjusts coordinate updates by defining a larger first region and a narrower second region to stabilize coordinate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensitivity is increased to detect fingers with small voltage drops, then detection capability is improved, but coordinates become unstable during hovering operations
Solution Approach 1:
The patent changes the parameter of region size dynamically based on detection state. A first region with larger size is used when coordinates are initially calculated, and a second region with smaller size is used for subsequent coordinate updates. This parameter change allows the system to maintain high sensitivity while filtering out unstable hovering detections through the size-based filtering mechanism.
2Measurement precision
If sensitivity is increased to suit fingers with small voltage drops, then detection accuracy is improved, but false detection of hovering state increases
Solution Approach 1:
The patent introduces regions (first region and second region) as intermediary filtering mechanisms between the detection unit and coordinate output. These regions act as mediators that evaluate whether coordinate changes are legitimate touches or false hovering detections, allowing the system to maintain high sensitivity while eliminating false detections through the region-based validation process.
3Speed
If coordinate update is performed continuously, then responsiveness is improved, but operational stability deteriorates
Solution Approach 1:
The patent implements dynamic coordinate update logic where the update behavior changes based on the detection state. When a touch is detected, coordinates are updated; when hovering is detected (coordinates within regions), coordinates are held constant. This dynamic adjustment of update frequency maintains responsiveness to legitimate touches while ensuring stability during hovering operations.
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 effectively suppresses the instability of coordinates during hovering operations, enhancing touch operability by maintaining accurate position detection and reducing unintended cursor movements.
Implementation Method 1
a first detection unit to detect a voltage drop caused by approach of a finger of an operator to the electrode wires
Data Source
AI summary
An operation detection device includes a detection unit to detect a physical quantity changing upon approach or contact of a detected object to or with an operation surface and to output detection information allowing for calculation of coordinates of an approach or contact position of the detected object, and a control unit to, when the physical quantity based on the detection information satisfies a predetermined condition, calculate and set first detected coordinates of the detected object as reference coordinates and does not perform coordinate update when coordinates calculated after the reference coordinates are included in a first region centered at the reference coordinates, and when coordinates calculated after the reference coordinates are outside the first region, set a second region narrower than the first region and perform the coordinate update, and when coordinates calculated after the updated coordinates are included in the second region, not to perform the coordinate update.