Rollable Display Spring Structure for Constant-Torque Drive
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Solution Overview
Problem
Existing rollable display devices face challenges in simplifying the driving unit while maintaining efficiency and reducing costs.
Innovation Solution
A display device with a display panel, a head bar, a roller, and four sets of spring units that intersect with a gear unit, utilizing a two-stage spring structure to minimize motor load and maintain constant torque, thereby simplifying the driving unit and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a traditional single-stage spring structure is used in the driving unit, then the structure is simpler, but the motor load is higher and efficiency is reduced
Solution Approach 1:
The spring structure is divided into two stages with different spring constants. The first stage spring (k1) and second stage spring (k2) operate sequentially, with each stage having optimized spring constants to minimize motor load at different positions during display panel movement. This segmentation allows the system to maintain lower overall motor load compared to a single-stage spring while achieving the required lifting force.
2Use of energy by moving object
If a two-stage spring structure is used to minimize motor load, then energy efficiency improves, but device complexity increases
Solution Approach 1:
The system transitions from a static single-stage spring to a dynamic two-stage spring configuration where the springs engage and disengage at different positions. The spring constants k1 and k2 are specifically optimized to provide the right balance between structural complexity and energy efficiency, ensuring minimal motor load throughout the movement range.
3Power
If the spring units are configured to move spaced apart or close according to roller rotation, then constant torque is achieved, but the mechanism becomes more complex
Solution Approach 1:
The spring units are designed with specific spring constants (k1, k2) and geometric parameters (lengths L1, L2, L3, L4) that change their effective configuration as the roller rotates. This parameter change allows the system to maintain constant torque output throughout the rotation range, optimizing power delivery while managing the complexity through careful parameter selection.
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 two-stage spring structure reduces the load on the motor, simplifies the driving unit, and maximizes efficiency by maintaining constant torque throughout the operation.
Implementation Method 1
a spring unit which is disposed on a rear surface of the display unit and is configured by two sets of upper stages and lower stages to move to be spaced apart from each other or close to each other in accordance with a rotation direction of the roller
Data Source
AI summary
According to an exemplary embodiment of the present disclosure, a display device includes a display unit including a display panel which displays an image, a head bar connected to an upper end of the display unit, a roller which is connected to a lower end of the display unit to ascend or descend the display unit, and four sets of spring units which are disposed on a rear surface of the display unit to intersect with respect to a gear unit, thereby minimizing loads of the display panel and the motor and maximizing an efficiency.