Sliding Mobile Terminal Frame Mechanism for Display Stress Control
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Solution Overview
Problem
Existing mobile terminals with flexible displays face challenges in maintaining a flat state and avoiding distortion when the size is extended, as stress concentration can lead to damage and gaps in the display unit.
Innovation Solution
A mobile terminal design featuring a pair of driving units, a motor, guide block, gear rack, and guide rail system that allows the second frame to move parallel to the first frame, preventing stress concentration and maintaining a flat display state through a sliding mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display size is extended using a flexible display, then the screen area is increased, but stress concentration occurs leading to display damage and gaps
Solution Approach 1:
The display assembly is segmented into a fixed first display assembly and a movable second display assembly. The second display assembly can be extended outward from the first frame along the first direction, allowing the display area to be increased without concentrating stress on a single continuous display panel. This segmentation enables the display to achieve larger screen area while maintaining structural integrity through modular construction.
Solution Approach 2:
The second display assembly is configured to be movable relative to the first frame, transitioning between a retracted state (within the first frame) and an extended state (outward along the first direction). This dynamic configuration allows the display area to be adjusted on demand, providing larger screen real estate when needed while maintaining a compact form factor when the extended display is not required, thereby avoiding permanent stress concentration.
2Adaptability or versatility
If the second frame moves during operation, then the display size can be adjusted, but gaps may occur in the flexible display unit
Solution Approach 1:
A driving unit is introduced as an intermediary mechanism between the second frame and the first frame. The driving unit includes a driving member that moves along a guide rail, with the second frame coupled to the driving member. This intermediary mechanism ensures that when the display size is adjusted, the movement is controlled and guided, preventing gaps from forming in the flexible display unit while still allowing size adaptability.
Solution Approach 2:
The manual or uncontrolled movement of the second frame is replaced with a motorized driving system. The driving unit uses a motor to control the movement of the driving member along the guide rail, which in turn controls the extension and retraction of the second frame. This mechanical substitution ensures precise, gap-free movement while maintaining display continuity during size adjustments.
3Device complexity
If a single driving unit is used, then the device complexity is reduced, but the frame may move unevenly causing distortion
Solution Approach 1:
While the overall system uses symmetric dual driving units for balance, each individual driving unit maintains an asymmetric internal structure with the driving member moving along a linear guide rail. This asymmetric guidance mechanism ensures that the driving force is applied in a single direction, preventing uneven or distorted movement of the frame while keeping each driving unit's structure relatively simple.
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 enables stable size adjustment of the screen without distortion, reducing the risk of damage and maintaining a flat display state, thus enhancing portability and usability while preventing stress concentration and gaps.
Implementation Method 1
a motor and a pinion gear coupled to each other, a gear rack engaged with the pinion gear, and a guide rail coupled to the gear rack
Implementation Method 2
a guide block disposed on the second frame and having a guide groove, and a guide rail coupled to the gear rack and disposed in the guide groove such that the guide block guides the gear rack and the pinion gear
Implementation Method 3
the guide block, the guide rail, the gear rack and the pinion gear may be disposed to overlap one another from the front direction to the rear direction of the mobile terminal
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3(a)~3(b)
AI summary
A mobile terminal comprises a first frame, a second frame capable of slidably moving from the first frame in a first direction or a second direction which is an opposite direction of the first direction, and a driving unit slidably moving the second frame, wherein the driving unit includes a motor coupled to the first frame, a pinion gear rotated by a rotational force transferred from the motor, a gear rack extended in the first direction and coupled to the second frame, moving in the first direction or the second direction when the pinion gear is rotated, a guide rail coupled with the gear rack, and a guide block coupled to the first frame, moving along the guide rail.