Folding Display Hinge Mechanism for Higher Torsion Force
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Solution Overview
Problem
The challenge of increasing the folding torsion force in OLED display devices becomes significant as the screen size increases, necessitating a design solution to enhance the folding mechanism's capability.
Innovation Solution
A folding mechanism incorporating a first rotating assembly with a first rotating shaft and shaft sleeve, featuring a slit and limiting portions, and a second rotating assembly with an elastic friction assembly, synchronized by connecting members and gears, to enhance torsion force and stabilize folding states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the screen size of the OLED display device is increased, then the display area is improved, but the folding torsion force requirement increases
Solution Approach 1:
The folding mechanism is divided into multiple rotating assemblies (first rotating assembly, second rotating assembly) with separate rotating shafts and shaft sleeves. Each rotating assembly independently contributes to the folding action, distributing the torsion force requirement across multiple components rather than relying on a single mechanism, thereby enabling support for larger display areas while maintaining adequate folding torsion force.
2Ease of operation
If a shaft sleeve with a slit is used to enable rotation, then the ease of operation is improved, but the structural strength is reduced
Solution Approach 1:
The shaft sleeve is pre-designed with a slit structure and limiting portions before assembly. The limiting portions are positioned to engage with corresponding features on the rotating shaft at specific rotational positions, enabling the shaft sleeve to maintain structural integrity while allowing controlled rotation. The slit is strategically positioned to permit rotational movement without compromising the overall strength of the shaft sleeve.
3Force
If multiple rotating assemblies are added to increase torsion force, then the folding capability is improved, but the device complexity increases
Solution Approach 1:
Multiple rotating assemblies are merged into a coordinated system where the first rotating assembly and second rotating assembly work together through connecting members. The shaft sleeves and rotating shafts are integrated with limiting portions that interact across assemblies, creating a unified folding mechanism that achieves enhanced torsion force while managing complexity through systematic integration rather than independent components.
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 mechanism increases torsion force, allowing for stable unfolding and folding of larger display screens by utilizing self-locking mechanisms and synchronized rotation, thereby supporting flexible displays of various sizes.
Implementation Method 1
a second rotating assembly with an elastic friction assembly
Data Source
AI summary
A folding mechanism includes: a first support member, a first rotating assembly and a first shaft sleeve. The first rotating assembly includes a first rotating shaft and a first rotating arm on the first rotating shaft. The first shaft sleeve has a first slit through inner and outer surfaces of the first shaft sleeve and both ends of the first shaft sleeve along a direction parallel to an axis of the first rotating shaft. The inner surface has a second limiting portion spaced apart from the first slit along a circumferential direction of the first shaft sleeve. An outer circumferential surface of the first rotating shaft has a first limiting portion used to: be engaged with the second limiting portion in a case of rotating to a first position, and be engaged with an inner end of the first slit in a case of rotating to a second position.