Flexible Display Cover Heating for Low-Temperature Folding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Flexible displays in foldable electronic devices can be damaged due to increased stiffness at low temperatures, causing damage when folded or unfolded, as the modulus of elasticity of the cover layer and underlying display layers becomes temperature-dependent.
Innovation Solution
Incorporation of a heating element in the cover layer to ohmically heat the cover layer, controlled by temperature and strain sensors, to reduce the modulus of elasticity and prevent damage by smoothing wrinkles, combined with hinge locking mechanisms to restrict movement at low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the device is folded or unfolded at low temperatures, then portability is enhanced, but the display layers become damaged due to increased stiffness
Solution Approach 1:
The heating element is activated before the folding operation to pre-warm the display layers, reducing their modulus of elasticity in advance. This preliminary thermal treatment ensures the layers are sufficiently flexible before mechanical stress is applied during folding, preventing damage while maintaining portability.
Solution Approach 2:
The temperature of the display layers is dynamically changed by the heating element to modify the modulus of elasticity. At low ambient temperatures, the heating element raises the local temperature of the display layers, transitioning them from a stiff state to a more flexible state, enabling safe folding operations across varying environmental conditions.
2Adaptability or versatility
If a heating element is added to reduce modulus of elasticity, then flexibility is improved, but device complexity increases
Solution Approach 1:
The heating element is controlled by a temperature sensor that continuously monitors the display layer temperature and automatically adjusts heating power to maintain optimal flexibility. This self-regulating system eliminates the need for complex external control mechanisms, as the device monitors and adjusts its own thermal state based on real-time conditions.
Solution Approach 2:
A temperature sensor provides feedback to the heating element control system, creating a closed-loop system that adjusts heating power based on actual display layer temperature. This feedback mechanism ensures the heating element only operates when and where needed, reducing unnecessary energy consumption and simplifying the overall control architecture while maintaining temperature adaptability.
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
Prevents damage to the display by ensuring smooth operation and flexibility across temperature variations, allowing safe folding and unfolding without excessive strain.
Implementation Method 1
A heating element such as a conductive layer may be located in the cover layer to ohmically heat the cover layer
Data Source
AI summary
An electronic device may include a housing having first and second housing portions that rotate relative to one another about a bend axis. A flexible display may have first and second display regions overlapping the first and second housing portions. The flexible display may be overlapped by a cover layer. A heating element such as a conductive layer may be used to ohmically heat the cover layer, thereby smoothing wrinkles and reducing the modulus of elasticity of polymer layers within the cover layer. The heating element may be controlled based on temperature data from a temperature sensor, strain data from a strain gauge, and/or other information. If desired, movement of the first housing portion relative to the second housing portion may be restricted (e.g., a hinge may be locked) when the temperature of the cover layer falls below a given threshold.