Rollable Display Mechanism for Symmetric Unrolling and Lower Motor Load
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Solution Overview
Problem
Existing display devices face challenges in stably rolling and unrolling flexible displays while maintaining bilateral symmetry, and there is a need to reduce the load on motor assemblies and interference between components during these operations.
Innovation Solution
The display device employs a lead screw to maintain bilateral symmetry during rolling and unrolling, uses a motor assembly with an electromagnet to reduce load, and improves the connection between a rod and link to minimize interference, all while reducing the overall volume by using separate rollers for the display panel and module cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a motor assembly is used to unroll the display from the roller, then the display can be unrolled, but the motor assembly experiences high load
Solution Approach 1:
A spring assembly is introduced as a counterweight mechanism to support the weight of the display panel during unrolling. The spring provides upward force to counterbalance the gravitational force acting on the display, significantly reducing the load on the motor assembly. The spring assembly includes a support rod connected to the display panel and a spring that expands/contracts to provide the counterbalancing force throughout the unrolling process.
2Manufacturing precision
If a lead screw is used to maintain bilateral symmetry during rolling and unrolling, then symmetry is maintained, but the device complexity increases
Solution Approach 1:
The lead screw mechanism utilizes asymmetric threading geometry to achieve symmetric operation. By configuring the lead screw with specific thread pitch and angle, and positioning it off-center relative to the roller axis, the mechanism converts rotational motion into linear motion that maintains bilateral symmetry of the display during rolling and unrolling. The asymmetric mechanical advantage of the lead screw compensates for the increased structural complexity.
3Reliability
If the rod and link connection is improved to prevent interference, then component interference is prevented, but the device complexity increases
Solution Approach 1:
A connection link serves as an intermediary component between the rod and the roller support structure. This link provides a controlled articulation point that allows the rod to move through its required range of motion without interfering with the lead screw or other components. The link acts as a mediator that translates the rod's linear motion into appropriate rotational or translational motion of the roller assembly, preventing mechanical interference while maintaining reliable operation.
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 load on motor assemblies, maintains symmetry during rolling and unrolling, prevents component interference, and minimizes the device's volume by optimizing the rolling mechanism.
Implementation Method 1
Another object of the present disclosure is to provide a display device capable of reducing a load of a motor assembly using an electromagnet when a display is unrolled from a roller
Implementation Method 2
Another object of the present disclosure is to provide a display device capable of reducing a load of a motor assembly using a spring when a display is unrolled from a roller
Implementation Method 3
Another object of the present disclosure is to provide a display device capable of unrolling a display from a roller while maintaining bilateral symmetry of the display rolled around the roller using a lead screw
Data Source
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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.