Portable Device Touch Input Large-Area Detection
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Solution Overview
Problem
Portable devices with touch-sensitive inputs often experience incorrect operations due to accidental contact, requiring increased concentration for tasks like unlocking or managing calls, and there's a need to prevent such unintended actions.
Innovation Solution
Incorporating a sensor system that detects large-area or nearly simultaneous inputs on the input surface to differentiate intentional from accidental contacts, allowing for the triggering of special functions like muting or unlocking without requiring precise touch, and integrating this with multi-touch displays for enhanced reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touchscreen is made highly sensitive to detect small touches, then input precision is improved, but accidental contact causes incorrect operation
Solution Approach 1:
The patent applies different evaluation criteria to different touch scenarios: small-area touches require high precision and concentration, while large-area touches are evaluated based on coverage proportion. This local differentiation allows the system to maintain high sensitivity for precise input while filtering out accidental contacts that cover large areas without intentional focus.
2Measurement precision
If the operating area is made small for precise input, then input precision is improved, but operation time increases and ease of operation decreases
Solution Approach 1:
The system dynamically adjusts the required input method based on the operation context. For time-critical operations like rejecting calls or muting microphones, the system accepts large-area touches that cover significant portions of the display, eliminating the need for precise small-area input and thus speeding up operation without sacrificing precision when needed.
3Ease of operation
If large-area input is recognized to enable quick operation, then ease of operation is improved, but random contact may trigger functions incorrectly
Solution Approach 1:
The patent changes the threshold parameter for triggering functions based on touch characteristics. Instead of a fixed threshold, the system evaluates the proportion of display area covered by the touch. Only touches covering more than a specified proportion of the display area trigger functions, creating an adaptive threshold that distinguishes intentional palm touches from accidental contacts.
4Measurement precision
If concentration and time are increased for precise input, then input accuracy is improved, but productivity decreases
Solution Approach 1:
For certain operations like unlocking or rejecting calls, the system accepts partial contact coverage rather than requiring precise small-area input. A touch covering a significant portion of the display area is sufficient to trigger the function, eliminating the need for concentrated precise input and thus improving operation efficiency without compromising security or accuracy.
Data Source
AI summary
An improved portable device has at least one touch-sensitive input surface for operator input and at least one sensor for detecting the input on the input surface. There is at least one sensor for monitoring the input surface which is designed to receive large-area and/or nearly simultaneous inputs, and at least one preset special function on the device which is able to be triggered by large-area input and/or nearly simultaneous inputs.