Invalid Area Specification for Touch Panel Error Prevention
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Solution Overview
Problem
Touch-panel cellular phones face errors due to users inadvertently touching the screen with their fingers or hands while holding the device, leading to unstable operation and potential drops, as existing solutions are inadequate for long touch times required in handwriting inputs.
Innovation Solution
A touch-panel cellular phone with an invalid area specification system that detects user touch areas and prevents input operations within a designated invalid area, using sensors to differentiate between holding and intentional input, thereby preventing accidental inputs and optimizing display by reducing image sizes within the invalid area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the entire surface of the touch panel is used as an input device, then the screen size can be maximized and user interaction becomes more intuitive, but error operations occur when users inadvertently touch the screen with their fingers or hands while holding the device
Solution Approach 1:
The touch panel is divided into a valid input area and an invalid area. The invalid area is specifically designated to prevent error operations when users hold the device, while the valid area maintains full functionality for intentional inputs. This segmentation allows the system to distinguish between accidental touches during device holding and intentional user inputs.
Solution Approach 2:
Different areas of the touch panel are assigned different functional qualities. The invalid area has the property of rejecting input operations to prevent errors, while the valid area maintains normal input responsiveness. This local differentiation in functional quality allows simultaneous achievement of large display area and operational reliability.
2Reliability
If the touch panel rejects inputs in certain areas to prevent error operations, then operation accuracy improves, but the usable input area is reduced
Solution Approach 1:
The touch panel is segmented into valid and invalid areas, where the invalid area is minimized to only the regions necessary to prevent error operations during device holding. This ensures that the reduction in usable input area is kept to the absolute minimum while still achieving the goal of preventing error operations.
3Reliability
If time-based detection is used to distinguish between holding and intentional input, then error operations can be reduced, but the processing complexity increases and handwriting inputs requiring long touch times are affected
Solution Approach 1:
The invalid area is predetermined and pre-designated based on device holding patterns, eliminating the need for real-time analysis of touch duration or complex processing during operation. This preliminary establishment of invalid areas allows the system to immediately reject error operations without complex processing, while handwriting inputs in valid areas are unaffected by time-based restrictions.
Data Source
AI summary
A touch-panel cellular phone specifies an invalid area not accepting a user's input operation on a touch panel in advance. The cellular phone detects a user's touch area on the touch panel so as to execute a function pre-assigned to the touch area not encompassed by the invalid area. Additionally, it is possible to reduce and display menu icons in the display area precluding the invalid area on the touch panel. Thus, it is possible to prevent an error operation when a user holding a cellular phone inadvertently touches the touch panel.