Rollable Display Device Roller Radius Control
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Solution Overview
Problem
Flexible rollable display devices face stress accumulation and potential deterioration when wound around a roller for extended periods due to constant curvature, leading to device degradation.
Innovation Solution
A rollable display device with a roller controller and sensor system that adjusts the radius of the roller by using a variable portion and fixing portion, reducing stress on the display panel through controlled rotation and winding mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the flexible display panel is wound around the roller for a predetermined period, then the display panel can be stored or transported in a compact form, but stress accumulates throughout the flexible display panel in proportion to time and the panel may deteriorate
Solution Approach 1:
The roller radius is made dynamically adjustable rather than fixed. The roller controller changes the radius based on the winding duration: when the display panel is wound for a predetermined period, the controller increases the roller radius to reduce stress accumulation, and when winding time is short, the controller maintains a smaller radius for compact storage. This dynamic adjustment resolves the contradiction between compact storage and panel durability.
2Reliability
If the roller radius is increased to reduce stress on the display panel, then the display panel durability is improved, but the storage compactness and portability are reduced
Solution Approach 1:
The roller radius is dynamically adjusted based on usage conditions rather than being fixed at a large size for durability. The controller monitors winding duration and automatically increases the radius only when stress accumulation becomes significant (after predetermined winding period), while maintaining a smaller radius for normal storage and transport, thus balancing durability with compactness.
Solution Approach 2:
The physical parameter of roller radius is changed based on operational conditions. The system transitions between two radius states: a smaller radius for compact storage and a larger radius for stress reduction during extended winding. This parameter change allows the system to optimize for different requirements at different times.
Data Source
AI summary
A rollable display device includes a roller, a display panel configured to be wound around the roller in a wound-up configuration and to display an image in an unwound configuration, a housing configured to house the display panel in the wound-up configuration and the roller, and a roller controller connected to the roller and configured to change a radius of the roller.