Foldable Display Vibration Control for Adhesive Deformation
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Solution Overview
Problem
Foldable and flexible display devices face deformation issues due to hardening adhesive layers when repeatedly folded or bent, leading to shape distortion.
Innovation Solution
Incorporating a folding sensor and vibration unit with a polyvinylidene fluoride (PVDF) piezoelectric film to generate vibrations based on folding states, controlled by a vibration controller that adjusts amplitude, duration, and volume in response to folding angles and times, preventing deformation and enhancing display functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive layers are used to bond display components, then assembly strength is improved, but deformation occurs when folded for long time
Solution Approach 1:
The patent applies mechanical vibration through a vibrator that generates vibrations in the folding region of the display device. The vibration controller activates the vibrator to vibrate the adhesive layers, preventing them from hardening and maintaining flexibility during folding operations, thereby resolving the contradiction between bonding strength and shape deformation.
Solution Approach 2:
The patent implements periodic action by controlling the vibrator to operate in periodic cycles rather than continuously. The vibration controller activates the vibrator for specific time periods during folding operations, providing intermittent vibration that prevents adhesive hardening while minimizing energy consumption and potential side effects.
2Reliability
If vibration amplitude and duration are increased to prevent adhesive hardening, then deformation prevention is improved, but power consumption increases
Solution Approach 1:
The patent uses periodic action by implementing intermittent vibration cycles with specific on/off timing. The vibration controller activates the vibrator only when needed during folding operations rather than continuously, reducing overall power consumption while maintaining effective prevention of adhesive hardening and deformation.
Solution Approach 2:
The patent applies dynamics by making the vibration parameters (amplitude, duration, frequency) adjustable and adaptive based on real-time folding conditions. The vibration controller dynamically modifies vibration characteristics to match the actual needs of the folding operation, optimizing the balance between deformation prevention and power consumption.
3Measurement precision
If multiple sensors and vibrators are added to handle complex folding states, then folding state detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the display device into distinct regions (folding region and non-folding region) with specific components placed in each region. Folding sensors are positioned in the folding region to detect local folding states, while vibrators are strategically placed to address specific areas, reducing the overall number of components needed while maintaining detection accuracy.
Solution Approach 2:
The patent implements universality by designing the vibration controller to handle multiple folding scenarios (single-fold, double-fold, partial-fold) using the same basic vibrator components. The system can adaptively control existing vibrators for different folding patterns without requiring additional specialized components, reducing device complexity while maintaining versatility.
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
The solution effectively prevents deformation of the display panel by dynamically adjusting vibration parameters, ensuring the display maintains its shape and functionality while folded or bent, and can also generate sound based on audio data.
Implementation Method 1
a vibration unit (130) including a polyvinylidene fluoride (PVDF) piezoelectric film
Implementation Method 2
a folding sensor to sense a folding state of the foldable display panel module
Data Source
AI summary
A display device includes a foldable display panel module to fold in a folding region, a folding sensor to sense a folding state of the foldable display panel module, a support on the foldable display panel module in the rigid region, a vibrator on the foldable display panel module in the folding region, and a vibration controller to control a vibration operation of the vibrator based on the folding state.