Rollable Display Rack Layout for Battery Space and Smooth Sliding
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Solution Overview
Problem
The challenge in electronic devices with rollable structures is the reduction in battery capacity due to the need for a rack that matches the sliding distance, leading to increased driving resistance and potential malfunctions from eccentricity, which contradicts the goals of slimming and enhancing operational reliability.
Innovation Solution
A disposition structure for the driving motor and electrical components that allows the rack to be positioned without overlapping the battery, ensuring the battery capacity is maximized while minimizing driving resistance by aligning the rack with the center of the device and using a guide structure to stabilize the sliding motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the rack is designed to match the sliding distance, then the sliding function is achieved, but the battery capacity is reduced
Solution Approach 1:
The rack is repositioned from a horizontal arrangement (which would occupy battery space) to a vertical arrangement along the sliding direction. This dimensional change allows the rack to extend along the length of the device rather than competing for width or depth space, thereby maintaining battery capacity while achieving the required sliding distance.
Solution Approach 2:
The rack is positioned asymmetrically along the central axis of the device, specifically aligned with the center of gravity. This asymmetric positioning optimizes the distribution of mass and minimizes eccentricity during sliding motion, reducing driving resistance while maintaining the rack's full length for adequate sliding distance.
2Duration of action of moving object
If the battery size is increased to improve usage time, then the usage time is extended, but the device thickness increases
Solution Approach 1:
The rack is positioned vertically along the sliding direction rather than horizontally, which changes the spatial dimension occupied by the rack. This allows the battery to be positioned in the remaining space without increasing device thickness, as the rack's vertical orientation utilizes the length dimension already required for sliding motion.
3Ease of manufacture
If the rack is disposed to the left or right of the electronic device, then the installation is simplified, but the driving resistance increases due to eccentricity
Solution Approach 1:
The rack is positioned asymmetrically along the central axis, specifically aligned with the center of gravity of the moving housing. This centralized asymmetric positioning minimizes the moment arm and reduces eccentricity during sliding motion, thereby decreasing driving resistance while maintaining installation simplicity.
Solution Approach 2:
The rack is aligned with the center of gravity of the moving housing, creating a balanced configuration where the gravitational force acts through the same point as the rack's force application. This equipotential alignment minimizes rotational moments and reduces the driving force required for sliding motion.
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
This configuration maintains battery capacity, reduces driving resistance, and enhances operational reliability by optimizing the layout of the rack and battery within the device, thus extending usage time and ensuring smooth sliding operations.
Implementation Method 1
a driving motor in the second housing and including a pinion gear; a rack fixedly coupled to the first housing and including a rack gear that is gear-coupled to the pinion gear
Data Source
AI summary
An electronic device includes: a first housing; a second housing slidably coupled to the first housing and configured to move between a slide-in state and a slide-out state with respect to the first housing; a flexible display including a display area configured to change based on a moving of the second housing; a multi-bar on a rear surface of a portion of the flexible display; a driving motor in the second housing and including a pinion gear; a rack fixedly coupled to the first housing and including a rack gear that is gear-coupled to the pinion gear; a main printed circuit board (PCB) in the second housing; a rack guide in the second housing and configured to support the rack; and at least one drive belt connected to an end of the multi-bar and an end of the second housing.