Biaxial Hinge Mechanism for Foldable Display Stress Reduction
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Solution Overview
Problem
Existing foldable display devices face challenges in achieving a durable and efficient folding mechanism that prevents damage to the display module during repeated folding and unfolding operations.
Innovation Solution
The proposed display device incorporates a hinge mechanism with a biaxial rotation axis overlapped with the folding region, featuring a plurality of rotation pin units, gears, and bracket cams to facilitate smooth folding and unfolding while minimizing stress on the display module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple folding structure is used, then device complexity is reduced, but reliability and durability of the folding mechanism deteriorates
Solution Approach 1:
The folding mechanism is divided into multiple functional components: rotation pin units for axial rotation, gears for rotational transmission, bracket cams for motion control, and spring units for force compensation. Each component handles a specific aspect of the folding operation, allowing the system to achieve reliable multi-axis rotation and force balancing without requiring a monolithic complex structure.
Solution Approach 2:
The bracket cam acts as an intermediary element between the gear and the folding region, translating rotational motion into controlled linear displacement. The spring unit serves as an intermediary force compensator, absorbing stress variations during folding. These intermediary components protect the display module from direct mechanical stress while enabling smooth folding motion.
2Reliability
If the folding region is made more robust to prevent damage, then reliability improves, but device complexity and weight increase
Solution Approach 1:
The bracket cam and spring unit form a protective intermediary system between the folding mechanism and the display module. The bracket cam controls the folding trajectory to avoid direct stress on the display, while the spring unit compensates for force variations, preventing sudden stress spikes that could damage the display. This intermediary mechanism protects the display without requiring the display structure itself to be overly robust.
Solution Approach 2:
The spring unit provides beforehand cushioning by pre-loading the folding mechanism with elastic force, which compensates for stress variations during folding operations. This elastic cushioning effect absorbs shock and prevents sudden stress spikes from reaching the display module, thereby preventing damage without requiring the display structure to be excessively robust.
3Ease of operation
If a biaxial rotation mechanism is implemented, then ease of operation improves, but device complexity increases
Solution Approach 1:
The biaxial rotation capability is achieved by segmenting the rotation function into two independent rotation pin units, each providing rotation around a separate axis. The first rotation pin unit provides rotation around a first axis, while the second rotation pin unit provides rotation around a second axis. This segmentation allows each axis to be optimized independently and simplifies the control of complex multi-axis motion through modular components.
Solution Approach 2:
The gear mechanism merges the rotational motions from both rotation pin units into a coordinated folding operation. By engaging the gears with the bracket cam, the system combines the effects of biaxial rotation into a unified folding motion that is easy to operate while maintaining the benefits of multi-axis flexibility.
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 the display device to be folded in a dumbbell shape, reducing the risk of damage to the folding region and enhancing the durability and usability of the device.
Implementation Method 1
a hinge, which is used to fold a display module in a dumbbell shape
Implementation Method 2
a plurality of rotation pin units connected to the first and second bodies to provide a biaxial rotation axis
Implementation Method 3
a plurality of gears which rotate in conjunction with the plurality of rotation pin units
Implementation Method 4
a plurality of bracket cams including side portions coupled to some of the plurality of gears. Opposite side portions of the plurality of bracket cams are moved along guide grooves
Data Source
AI summary
A display device includes a display module including a first non-folding region, a second non-folding region, and a folding region disposed between the first and second non-folding regions, a first body disposed on the first non-folding region, a second body disposed on the second non-folding region, a plurality of rotation pin units connected to the first and second bodies to provide a biaxial rotation axis, which is overlapped with the folding region, to the first and second bodies, and a plurality of gears which rotate in conjunction with the rotation pin units. The plurality of gears is disposed on the rotation pin units.