Rollable Display Support Linkage for Lower Motor Torque
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Solution Overview
Problem
Existing display devices require significant motor force to transition between states, leading to larger motor sizes and housing dimensions, which can obstruct the user's view and increase the device's overall size.
Innovation Solution
A display device design incorporating a spring portion within an auxiliary link to reduce the torque required for transitioning, utilizing a combination of springs with varying spring constants and supporters to balance the force needed, allowing for a more compact motor assembly and thinner housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a motor assembly is used to transition the display panel and module cover between wound and unwound states, then the display portion can be deployed and retracted, but the motor requires significant force leading to larger motor sizes and housing dimensions
Solution Approach 1:
The patent implements a telescopic support structure where the support rod extends and retracts in a nested manner. The support rod contains inner and outer tubular structures that slide relative to each other, allowing compact storage when retracted and extended deployment when needed. This nesting principle reduces the overall volume requirement of the motor assembly by enabling the support structure to occupy minimal space in its retracted state.
Solution Approach 2:
The patent employs a dynamic transmission mechanism that adjusts the transmission ratio during the deployment process. The variable transmission ratio allows the motor to operate at optimal torque and speed conditions throughout the motion range, reducing peak force requirements. This dynamic adjustment enables smoother deployment with lower motor power requirements compared to fixed transmission ratios.
2Reliability
If significant motor force is used to transition between states, then reliable state changes are achieved, but the housing dimensions increase and obstruct user view
Solution Approach 1:
The telescopic support structure uses nested tubular rods that retract into each other, minimizing the extended length of the housing. When the display portion is not in use, the support rod fully retracts, reducing the overall thickness of the housing to minimal dimensions. This ensures the housing does not obstruct the user's view when the display is stowed.
Solution Approach 2:
The support rod is divided into multiple segmented sections (inner tube, outer tube, intermediate sections) that can move relative to each other. This segmentation allows the support structure to achieve extended length for reliable display deployment while maintaining compact retracted length. Each segment can be independently controlled, enabling reliable state transitions with reduced overall dimensions.
3Device complexity
If a simple transmission mechanism is used, then device complexity is reduced, but insufficient force control leads to inadequate state transition
Solution Approach 1:
The transmission mechanism incorporates a variable transmission ratio that dynamically adjusts during operation. The transmission ratio changes based on the position of the support rod, providing higher torque multiplication when the rod is retracted (where more force is needed) and lower ratio when extended. This dynamic adjustment achieves adequate force control without requiring an overly complex multi-stage transmission system.
Solution Approach 2:
The patent utilizes changes in mechanical parameters (transmission ratio, lever arm length) throughout the deployment cycle to optimize force control. By varying these parameters dynamically, the system achieves sufficient force multiplication at critical points in the motion while maintaining overall system simplicity. This approach avoids the need for complex variable displacement mechanisms.
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 reduces the motor force required, enabling a smaller motor and housing size, enhancing user immersion by minimizing the device's visual obstruction and improving operational efficiency.
Implementation Method 1
an auxiliary link connected to the housing and connected to an other end of the transmission portion, the auxiliary link including a spring portion to exert force on the transmission portion
Data Source
AI summary
A display device includes a housing; at least one roller positioned within the housing; a display portion including a display panel and a module cover; and an operating portion connected to one end of the display portion and to change a display portion's state, wherein the display panel and the module cover transition from a first state where the display panel and the module cover are wound around the at least one roller to a second state where the display panel and the module cover are unwound from the at least one roller, in contact with each other, and exposed out of the housing. The operating portion includes a motor assembly; a support, one end which is connected to one end of the display portion and an other end which is connected to the motor assembly; a transmission portion, one end of which is connected to the support; and an auxiliary link connected to the housing and connected to an other end of the transmission portion, the auxiliary link including a spring portion to exert force on the transmission portion.