Foldable Display Input via Ultrasonic and Infrared Pen Signals
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Solution Overview
Problem
Portable terminals with foldable display units face challenges in maintaining accurate input detection due to spatial limitations and the potential for touch screen errors when folded, as the tensile strength of the touch screen may not match the display unit's strength, leading to interruptions or blurring of the display.
Innovation Solution
An electronic pen that generates ultrasonic and infrared signals is used in conjunction with sensors on the terminal to determine coordinate information, allowing for precise input detection and avoiding errors by calculating distances and folding angles, ensuring accurate coordinate calculation and function activation on the display map.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a touch screen is used for input, then input functionality is provided, but the tensile strength of the touch screen is not secure enough, leading to errors after repeated opening and closing
Solution Approach 1:
The patent introduces an electronic pen as an intermediary input device that interacts with the foldable display through electromagnetic signals rather than direct mechanical contact. The electronic pen generates electromagnetic signals that are detected by sensors embedded in the display, eliminating the need for the display surface itself to have high tensile strength while maintaining input functionality.
Solution Approach 2:
The patent replaces the mechanical touch screen input mechanism with an electromagnetic signal-based system. Instead of relying on physical pressure and contact detection that stresses the display material, the system uses electromagnetic signals transmitted from the electronic pen to convey input information, thereby substituting a mechanical system with a field-based system.
2Volume of moving object
If the display unit is folded to overcome spatial limitations, then portability is improved, but display errors occur due to hinge area processing issues
Solution Approach 1:
The patent implements dynamic coordinate transformation that automatically adapts to the folding state of the display. The system detects the folding angle and real-time geometric changes, then dynamically transforms coordinate systems to ensure continuous and accurate display across different folding configurations, making the display system flexible and adaptive rather than rigid.
Solution Approach 2:
The patent changes the parameter representation of display coordinates based on the folding state. By detecting folding angles and adjusting coordinate parameters accordingly, the system maintains display accuracy and continuity despite physical changes in the display geometry caused by folding.
3Device complexity
If coordinate information is determined without considering folding angle, then calculation simplicity is maintained, but coordinate accuracy deteriorates due to folding
Solution Approach 1:
The patent implements a feedback mechanism where the folding angle detection information is fed back into the coordinate calculation process. The system continuously monitors the folding state and uses this information to adjust coordinate transformations, ensuring accurate coordinate determination that accounts for the current folding configuration.
Solution Approach 2:
The patent performs preliminary detection of the folding angle and pre-calculates the necessary coordinate transformation parameters before processing input signals. By preparing the transformation data in advance based on the current folding state, the system avoids complex real-time calculations while maintaining high coordinate accuracy.
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 enables accurate and reliable input detection on foldable display units, preventing errors and maintaining continuous display functionality even when the terminal is folded, thus enhancing the usability of portable terminals.
Implementation Method 1
determining a first distance between a first ultrasonic sensor unit of the terminal and the electronic pen in response to the first ultrasonic sensor unit detecting an ultrasonic signal generated by the electronic pen
Implementation Method 2
detecting a third distance between an infrared sensor unit of the terminal and the electronic pen in response to the infrared sensor unit detecting an infrared signal generated by the electronic pen
Data Source
AI summary
An input apparatus including an electronic pen and a terminal having a foldable display unit is provided. An electronic pen generates an ultrasonic signal and an infrared signal. A terminal detects the ultrasonic signal and the infrared signal and calculates coordinate information of the electronic pen based on the received ultrasonic signal and the infrared signal. The terminal determines coordinate information of the electronic pen with respect to the foldable display unit by measuring a folding angle of the foldable display unit.