Rollable Display Linkage and Lead Screw Layout for Symmetric Unrolling
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Solution Overview
Problem
Existing display devices face challenges in stably rolling and unrolling flexible displays around a roller while maintaining bilateral symmetry and reducing the load on motor assemblies, leading to potential interference and increased volume.
Innovation Solution
A display device design incorporating a housing with a roller, a link system, lead screws, and magnetic locking mechanisms to manage the display's rolling and unrolling process, utilizing a motor assembly with lead screws and springs to maintain symmetry and reduce load, and preventing interference between rods and lead screws.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a motor assembly is used to roll and unroll the display, then the display can be moved between folded and unfolded states, but the motor assembly creates interference between the rod and lead screw
Solution Approach 1:
The motor assembly is divided into separate functional components: the lead screw mechanism for precise linear motion control and the rod for structural support. By segmenting the assembly, the patent eliminates interference between components while maintaining the ability to roll and unroll the display panel between folded and unfolded states.
Solution Approach 2:
A slider acts as an intermediary component between the lead screw and the rod, translating rotational motion from the lead screw into linear motion of the rod without direct contact that would cause interference. This mediator enables smooth operation while preventing mechanical conflict between components.
2Volume of moving object
If the display is rolled around a roller to reduce volume, then compactness is improved, but maintaining bilateral symmetry during rolling becomes difficult
Solution Approach 1:
The patent employs asymmetric positioning of the roller within the housing and asymmetric arrangement of the link mechanism to compensate for the inherent asymmetry introduced by rolling. This deliberate asymmetric design ensures that the display panel maintains bilateral symmetry relative to its own centerline during the rolling and unrolling process, while still achieving compact volume reduction.
Solution Approach 2:
The problem of maintaining symmetry during rolling is solved by introducing a third dimension - the vertical positioning of the roller and link mechanism. By controlling the vertical position and motion of the link system, the patent ensures that the display panel remains horizontally centered and symmetric during rolling, transforming a 2D symmetry problem into a 3D spatial control solution.
3Manufacturing precision
If a lead screw mechanism is used to maintain bilateral symmetry, then symmetry control is improved, but the load on the motor assembly increases
Solution Approach 1:
The link mechanism functions as a counterbalancing system that offsets the weight and resistance encountered by the lead screw during operation. By positioning the link to create mechanical advantage and balance forces, the patent reduces the net load on the motor assembly while maintaining precise control over the display panel's symmetry during rolling and unrolling.
Solution Approach 2:
The system transitions from a static, high-load configuration to a dynamic, adaptive configuration. The lead screw and link mechanism adjust their positions and forces dynamically during the rolling process, optimizing the mechanical advantage at each stage of motion. This dynamic adjustment reduces peak motor load while maintaining symmetry control throughout the entire range of motion.
4Power
If the rod connection position is optimized to reduce motor load, then power consumption is reduced, but interference between rod and lead screw may occur
Solution Approach 1:
The rod connection position on the link is predetermined and optimized during the design phase to achieve the best balance between motor load reduction and interference prevention. By pre-calculating and pre-positioning the connection point, the patent eliminates the need for runtime adjustments that could cause interference, while maintaining optimal mechanical advantage throughout the operating range.
Solution Approach 2:
The rod serves multiple functions simultaneously: it provides structural support, transmits force from the lead screw, and its optimized connection position reduces motor load. This multi-functional design eliminates the need for separate components for each function, reducing overall device complexity while achieving both load reduction and interference prevention through the unified rod-link assembly.
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 allows for stable rolling and unrolling of flexible displays while maintaining bilateral symmetry, reducing the load on motor assemblies, and minimizing volume, thereby enhancing the operational efficiency and compactness of the display device.
Implementation Method 1
a first lock magnet positioned at a lower side of the upper bar, and a second lock magnet corresponding to the first lock magnet and positioned at an upper side of a bottom surface of the housing. A repulsive force generated between the first lock magnet and the second lock magnet may be transmitted to the second arm.
Data Source
AI summary
A display device according to an embodiment of the present invention comprises: a housing; a roller installed inside the housing; a display unit wound around the roller; a link having a first arm rotatably mounted to the display unit and a second arm rotatably connected to the first arm and rotatably mounted to the housing; a lead screw installed inside the housing; a slider that moves over the lead screw according to the rotation of the lead screw; a rod having one side connected to the slider and the other side connected to the second arm; an upper bar coupled to the upper side of the display unit; a first lock magnet located below the upper bar; and a second lock magnet corresponding to the first lock magnet and located above the bottom surface of the housing.