Electro Permanent Magnet Display Coupling for Impact Protection
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Solution Overview
Problem
Portable terminals are prone to damage from external impacts due to their vulnerable window members, which are not adequately protected against shocks and falls.
Innovation Solution
A display apparatus comprising a display module with a window member and a magnetic member, coupled to a set bracket via an electro permanent magnet that can decouple from the display module upon detecting an impact exceeding a reference value, thereby reducing damage by altering the magnetic attraction and repulsion forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the window member is made larger to cover the display panel, then the display area and visibility are improved, but the vulnerability to impact damage increases
Solution Approach 1:
The coupling mechanism is divided into two functional parts: a magnetic member attached to the display module and an electro permanent magnet attached to the set bracket. This segmentation allows independent control of the coupling force, enabling the system to maintain strong adhesion during normal use while allowing controlled decoupling during impact events.
Solution Approach 2:
The electro permanent magnet enables dynamic switching between coupled and decoupled states based on impact detection. During normal operation, the magnet maintains strong magnetic attraction to secure the display module. Upon detecting an impact exceeding a reference value, the magnet's polarity is reversed to repel the magnetic member, allowing the display module to move independently and absorb impact energy.
2Stability of the object's composition
If the display module is firmly coupled to the set bracket, then structural stability is improved, but impact damage to the display module increases
Solution Approach 1:
The system applies preliminary anti-action by detecting impending impact through acceleration sensors before the impact fully occurs. When an impact exceeding a reference value is detected, the electro permanent magnet reverses its polarity in advance to repel the magnetic member, allowing the display module to decouple and move independently, thereby counteracting the harmful impact forces before they can damage the display panel.
Solution Approach 2:
The magnetic coupling system provides beforehand cushioning by maintaining a controllable magnetic bond that can quickly release during impact. The electro permanent magnet is configured to reverse polarity and create repulsive force when impact is detected, allowing the display module to move away from the set bracket and absorb impact energy through relative movement, thereby cushioning the blow that would otherwise be transmitted directly to the display panel.
3Object-affected harmful factors
If an electro permanent magnet is used to control coupling, then impact protection is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical coupling mechanisms with a magnetic field-based system. Instead of using mechanical latches, springs, or motors to control coupling and decoupling, the system uses an electro permanent magnet that can switch between attractive and repulsive states by reversing current polarity. This substitution simplifies the mechanical structure while providing reliable impact protection through electromagnetic control.
Solution Approach 2:
The electro permanent magnet changes its magnetic field parameter (polarity) in response to impact detection. By reversing the current direction through the coil, the magnet transitions from an attractive state (holding the display module securely) to a repulsive state (releasing the display module during impact). This parameter change allows a single component to perform both coupling and decoupling functions, reducing overall system complexity.
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 reduces the impact on the display module by decoupling it from the set module during significant impacts, minimizing damage and ensuring the display apparatus remains functional.
Implementation Method 1
an electro permanent magnet fixed to the set bracket and configured to be coupled to the display module in a first mode and to be decoupled from the display module in a second mode
Implementation Method 2
The main printed circuit substrate may include an acceleration sensor configured to calculate the impact which is applied to the display apparatus based on acceleration
Implementation Method 3
a magnetic member attached to at least one of the display panel and the window member
Data Source
AI summary
A display apparatus includes: a display module including a display panel, a window member on the display panel and having an area greater than an area of the display panel, and a magnetic member attached to at least one of the display panel and the window member; a set bracket under the display module; and an electro permanent magnet fixed to the set bracket. The electro permanent magnet is coupled to the display module in a first mode and decoupled from the display module in a second mode. The display apparatus is configured to enter the second mode from the first mode if an impact equal to or greater than a reference value is applied or is to be applied after a period of time.