Mobile Terminal Roller-Hinged Display for Flat Extension
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Solution Overview
Problem
Existing flexible displays in mobile terminals face issues with durability and waviness when bent at specific positions, limiting their utility and stability.
Innovation Solution
A mobile terminal design featuring a flexible display unit with a fixed portion and variable portion, coupled to a roller with teeth, and a rolling hinge with support bars and a coil spring mechanism, allowing the display to extend and retract smoothly while maintaining flatness and preventing stress concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the flexible display is bent at a specific position to enable size variation, then the display can be extended and retracted, but the bending point becomes limited and prone to damage, reducing durability
Solution Approach 1:
The display unit is divided into a fixed portion and a variable portion, allowing the flexible display to be segmented rather than bent at a single point. The variable portion can change length independently while the fixed portion remains stable, distributing mechanical stress across multiple points and preventing damage concentration at one location.
Solution Approach 2:
A rolling hinge mechanism is introduced as an intermediary between the fixed and variable portions of the display. This rolling hinge acts as a mediator that allows smooth transitions and size changes while preventing direct bending of the flexible display at a fixed point, thereby protecting the display from damage.
2Adaptability or versatility
If the flexible display is extended to increase screen size, then utility is improved, but the display may become wavy and lose flatness
Solution Approach 1:
By segmenting the display into fixed and variable portions connected through a rolling hinge, the system maintains the fixed portion's flatness while allowing the variable portion to extend. This segmentation prevents the entire display from becoming wavy during extension, as the fixed portion remains stable and the rolling hinge manages the transition smoothly.
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 allows for adjustable screen size, enhances durability by preventing damage, and maintains display flatness during transitions, ensuring both portability and utility.
Implementation Method 1
a coil spring having one side coupled to the fixed shaft and the other side coupled to the driving shaft... the coil spring may provide elasticity to restore the reference number of turns to the driving shaft and the rotating cylinder
Data Source
AI summary
Provided is a mobile terminal switchable from a first state to a second state extended in a first direction, the mobile terminal comprising: a first frame; a second frame slidable in the first direction with respect to the first frame; a roller coupled to the end of the second frame in the first direction; a flexible display including a fixing part coupled to the first frame and a variable part extends from the fixing part and surrounding the roller, and is positioned on the front surface according to the sliding movement of the second frame; and a rolling hinge positioned on the rear surface of the variable part and changing correspondingly to the shape of the variable part, wherein the roller includes a sawtooth part formed on the outer surface thereof, and the rolling hinge includes a concave-convex part corresponding to the sawtooth part.