Touch Panel Region Segmentation for Accidental Touch Filtering
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Solution Overview
Problem
Portable electronic devices with touch screens often experience unintended operations due to accidental touches or external pressures, leading to missed inputs and unexpected functions being activated.
Innovation Solution
The touch panel is divided into valid input, transition, and peripheral regions, with a sensing method that determines the initial position and moving direction of contact motions to differentiate between valid and invalid input signals, dynamically adjusting region proportions based on contact area, number, and shape to enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch panel uses a conventional uniform sensing structure, then the device structure is simple, but the accuracy for determining valid input signals deteriorates due to accidental touches and external pressures
Solution Approach 1:
The touch panel is divided into three distinct regions: valid input region, transition region, and peripheral region. This segmentation allows different sensitivity levels in different areas, enabling the system to distinguish between intentional touches in the valid input region and accidental touches in the peripheral region, thereby improving input signal validation accuracy without requiring complex additional hardware.
Solution Approach 2:
Different regions of the touch panel are assigned different sensitivity characteristics. The valid input region has high sensitivity for accurate input detection, while the peripheral region has low sensitivity to ignore accidental touches. The transition region provides a gradient between these extremes. This local differentiation of sensing characteristics improves validation accuracy while maintaining a relatively simple overall structure.
2Reliability
If the touch panel has high sensitivity to detect all contact motions, then the response speed is fast, but the reliability deteriorates due to unexpected operations from accidental touches
Solution Approach 1:
By segmenting the touch panel into valid input region, transition region, and peripheral region, the system can rapidly determine the initial position of a contact motion and immediately classify it as valid or invalid based on which region it falls into. This spatial segmentation enables fast filtering of accidental touches without requiring complex analysis, maintaining both speed and reliability.
Solution Approach 2:
The system performs preliminary determination of the initial position and moving direction of contact motions before executing operations. By pre-establishing the three-region division and using it to quickly classify inputs, the system avoids unnecessary processing of accidental touches while maintaining fast response to valid inputs, thus improving reliability without significantly impacting response speed.
3Measurement precision
If the touch panel ignores contact motions from the peripheral region, then the accuracy for filtering accidental touches is improved, but the ease of operation deteriorates because valid inputs from edge areas are lost
Solution Approach 1:
The touch panel is segmented into valid input region, transition region, and peripheral region. The transition region acts as a buffer zone between the high-sensitivity valid input region and the low-sensitivity peripheral region. This segmentation allows the system to filter accidental touches in the peripheral region while still allowing valid inputs from edge areas through the transition region, balancing filtering accuracy with operational accessibility.
Solution Approach 2:
The transition region provides a gradient of sensitivity between the valid input region and peripheral region. This local quality transition allows the system to maintain high sensitivity near the center for accurate input detection while gradually reducing sensitivity toward the edges to filter accidental touches, thus preserving ease of operation for legitimate edge inputs while improving filtering accuracy.
4Adaptability or versatility
If the touch panel uses a fixed region division, then the device complexity is low, but the adaptability deteriorates when users have different usage habits and preferences
Solution Approach 1:
The region division is made dynamic and adjustable rather than fixed. The system can adapt the boundaries and characteristics of the valid input region, transition region, and peripheral region based on user usage patterns and preferences. This dynamic adjustment allows the system to learn from user behavior and optimize the region division for individual users, improving adaptability while adding manageable complexity through software-based configuration rather than hardware changes.
Data Source
AI summary
The invention provides a sensing method for a portable device with a touch panel. The touch panel is sequentially divided into a valid input region, a transition region and a peripheral region from a center to a periphery of the touch panel. The sensing method comprises sensing a contact signal generated from a contact motion of an input device on the touch panel. When the initial position of the contact motion is determined to be within one of the valid input region and the transition region according to the contact signal or the initial position of the contact motion is determined to be within the peripheral region and the contact motion moves into the valid input region according to the contact signal, an operation corresponding to the contact motion is executed according to the contact signal.