Rollable Display Length Sensing for Jam-Resistant Extension Control
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Solution Overview
Problem
Existing technologies struggle to accurately determine the extended length of a rollable display in electronic devices, which can lead to mechanical jams and damage to internal components due to unpredictable extension and contraction.
Innovation Solution
The electronic device employs a motor module with an encoder and Hall sensors to measure rotational driving information, allowing precise estimation of the extended display length, and includes a control system to prevent mechanical jams by detecting stalls and adjusting motor operation accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display is made flexible and rollable to enable various shapes and portability, then the adaptability and portability are improved, but the reliability deteriorates due to unpredictable extension and contraction causing mechanical jams and component damage
Solution Approach 1:
The system uses Hall sensors to detect the position of the magnet attached to the movable housing, providing real-time feedback on the display extension state. This feedback enables the control system to monitor and control the extension and contraction movements, preventing mechanical jams and improving reliability while maintaining flexibility
Solution Approach 2:
The patent replaces direct mechanical connection and sensing with a magnetic field-based sensing system. Hall sensors detect the magnet's position without mechanical contact, eliminating mechanical wear and improving reliability while allowing smooth flexible movement of the display
2Measurement precision
If sensors are added to detect display extension length, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
A magnet is introduced as an intermediary carrier that translates the mechanical position of the movable housing into a detectable magnetic field signal. The Hall sensors detect the magnet's position, providing precise measurement of display extension without requiring complex direct mechanical sensing mechanisms
Solution Approach 2:
The system changes the measurement parameter from direct mechanical displacement to magnetic field position detection. By detecting the magnet's position through Hall sensors, the system achieves precise measurement of extension length while simplifying the sensing mechanism
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 control of the display's extension and contraction, preventing mechanical damage and ensuring smooth operation of the rollable display.
Implementation Method 1
a magnet and a plurality of Hall sensors spaced apart from each other along a direction parallel to the axis on which the magnet is movable
Data Source
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AI summary
An electronic device is configured to determine a screen length extending in one direction on a display screen viewed on one side, based on motor driving information that is based on rotational driving of a motor and sensed magnetic force information that is generated through magnetic force sensing performed by one or more Hall sensors.