Extendable Display Mobile Terminal Sliding Frame Stress Distribution
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Solution Overview
Problem
Flexible displays in mobile terminals face limitations in maintaining a stable flat state when extended, leading to stress concentration on specific portions and potential damage, while also risking contamination from external exposure of internal components.
Innovation Solution
A mobile terminal design featuring a body with sliding frames, reinforcing ribs, and supports with low friction layers, along with a rolling hinge and driving unit, allows for adjustable size without distorting the display, maintaining a flat state and preventing external exposure of internal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the flexible display is extended to increase screen size, then the display area is improved, but the display unit cannot maintain a stable flat state and stress concentrates on specific portions
Solution Approach 1:
The display unit is divided into a front portion, a rear portion, and a side portion that connects them. The side portion can be selectively extended or retracted, allowing the display area to be increased while maintaining structural stability through segmented design.
Solution Approach 2:
The mobile terminal employs a variable structure where the side portion of the display unit can dynamically extend or retract. This dynamic configuration allows the display area to change while the supporting structure adapts to maintain the flat state stability during different extension states.
2Length of moving object
If the flexible display is bent at a specific position to enable extension, then the display can be extended, but the durability is reduced due to stress concentration
Solution Approach 1:
By segmenting the display unit into front, rear, and side portions with the side portion being extendable, the bending and stress are distributed across multiple segments rather than concentrated at a single fixed hinge point, improving durability while maintaining extension capability.
Solution Approach 2:
The side portion of the display unit is designed with specific local properties that allow it to be extended or retracted while the front and rear portions maintain their structural integrity. This local quality differentiation enables extension without compromising overall durability.
3Adaptability or versatility
If the mobile terminal has a variable structure to change size, then the adaptability is improved, but internal components are exposed to external contaminants
Solution Approach 1:
The side portion of the display unit acts as a flexible barrier that can extend or retract while maintaining a continuous protective surface. This flexible shell structure allows size variability while preventing contaminant exposure to internal components during extension movements.
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 design enhances durability by distributing stress evenly, maintaining a continuous large screen during extension, preventing damage, and ensuring internal components remain protected from contaminants, thus improving usability and portability.
Implementation Method 1
The rib protrusion and the rib groove may further include a low friction layer on their surfaces.
Implementation Method 2
a rolling hinge is located on a rear surface of the second area and enables bending deformation to correspond to a shape of the second area
Data Source
AI summary
A mobile terminal comprises a body including a first frame and a second frame slidably coupled to a rear surface of the first frame in a first direction or a second direction; a flexible display unit including a front portion located on a front surface of the body, a rear portion located on a rear surface of the body, and a side portion connecting the front portion with the rear portion and surrounding one side of the body; a plurality of reinforcing ribs protruded from a rear surface of the first frame and extended in the first direction; and a plurality of supports protruded from a front surface of the second frame and located between the respective reinforcing ribs. The mobile terminal may enhance usability and portability by varying its size.