Capacitive Touch Panel Priority Detection for Erroneous Input
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Solution Overview
Problem
Capacitive touch panels often erroneously detect input manipulations due to changes in capacitance caused by non-manipulation actions, such as a user holding the device, leading to incorrect detection of input positions and gestures.
Innovation Solution
An information processing apparatus with a capacitive touch panel that includes a sensor unit generating sensor signals based on object proximity and contact, a proximity detecting unit that sets a priority order for detected objects, and a determining unit that validates detection results based on priority and region, preventing erroneous inputs by controlling sensitivity and using a detection invalidation flag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch panel detects all capacitance changes, then all manipulation objects are detected, but erroneous detection occurs due to non-manipulation actions
Solution Approach 1:
The patent applies local quality by dividing the touch panel into multiple regions with different detection characteristics. Specifically, it distinguishes between a first region where only contact manipulation is detected and a second region where both proximity and contact manipulation are detected. This regional differentiation allows the system to reduce erroneous detection in areas prone to false inputs (like握持 regions) while maintaining high detection accuracy in interactive regions.
Solution Approach 2:
The patent segments the detection process into multiple stages: proximity detection, contact detection, and validation processing. It also segments the manipulation objects into different types (first manipulation object in first region, second manipulation object in second region) with different detection rules. This segmentation enables the system to apply different validation criteria to different detection scenarios, improving overall reliability.
2Measurement precision
If the touch panel increases detection sensitivity, then more manipulation objects are detected, but false positive detection increases
Solution Approach 1:
The patent implements preliminary action by performing proximity detection before contact detection, and by pre-defining valid manipulation regions and criteria. The system预先 identifies potential manipulation objects and their types based on detection timing and location, then applies appropriate validation rules. This preliminary classification prevents false positives by filtering out invalid detections before they can trigger erroneous input processing.
Solution Approach 2:
The patent uses feedback mechanisms to validate detection results. The processing unit receives detection results from the detection unit and applies validation rules based on the type of manipulation object, detection region, and detection timing. The system feedbacks to determine whether a detected object represents valid input or should be ignored, continuously refining detection accuracy through validation feedback.
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 solution effectively prevents erroneous input detection by prioritizing valid manipulation objects and adjusting sensitivity, ensuring accurate input manipulation even when multiple objects are detected, thereby enhancing the reliability of touch panel inputs.
Implementation Method 1
In the capacitive touch panel, a change in capacitance generated by causing a manipulation object such as a finger or a contact pen to contact a touch panel manipulation surface is detected
Data Source
AI summary
A sensor unit 11 generates a sensor signal according to proximity and contact of a manipulation object. A proximity detecting unit 12 performs proximity detection of the manipulation object, on the basis of the sensor signal. When a plurality of manipulation objects are detected by the proximity detection, a determining unit 13 sets a priority order to the detected manipulation objects and adopts a proximity detection result on the basis of the set priority order. For this reason, even though the plurality of manipulation objects are detected, the proximity detection result having the high priority order is adopted, so that erroneous detection can be prevented and an input manipulation can be correctly performed.