Rollable Display Device Separate Rotation Members
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Solution Overview
Problem
Rollable display devices face stress and potential component detachment or cracking when rolled due to the stress generated during the rolling operation, which affects their reliability and functionality.
Innovation Solution
A rollable display device design that includes a window member, a first pressure-sensitive adhesive member, a housing with grooves, and separate rotation members for the window and display modules, allowing them to roll or slide independently, thereby reducing stress and improving reliability by minimizing buckling and cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the window member and display module are rolled together on the same rotation member, then the device structure is simplified, but stress concentration occurs causing component detachment or cracking
Solution Approach 1:
The patent divides the rolling function into separate rotation members: a first rotation member for the window member and a second rotation member for the display module. This segmentation allows independent rolling control, reducing stress concentration and preventing component detachment while maintaining a manageable device structure.
Solution Approach 2:
The pressure-sensitive adhesive member acts as an intermediary between the window member and display module. It allows temporary bonding during assembly while permitting independent rolling motion on separate rotation members, thus mediating between the need for structural integration and the need for independent stress management.
2Ease of manufacture
If the window member and display module are tightly bonded, then assembly is simplified, but stress during rolling causes detachment or cracking
Solution Approach 1:
The pressure-sensitive adhesive member provides dynamic bonding characteristics: strong adhesion during assembly and static placement, but allows controlled separation and independent motion during rolling operations. This dynamic behavior resolves the contradiction between easy assembly and rolling durability.
Solution Approach 2:
The bonding interface is segmented into discrete pressure-sensitive adhesive regions rather than continuous rigid bonding. This allows the window member and display module to be easily assembled while permitting independent stress management during rolling, preventing crack propagation.
3Shape
If the display module length matches the window member length, then the unrolled appearance is optimized, but stress distribution during rolling is uneven
Solution Approach 1:
By separating the rolling functions into different rotation members, the patent enables independent motion control even when lengths are matched for aesthetic purposes. This segmentation prevents stress concentration at the interface while maintaining the optimized unrolled appearance.
Solution Approach 2:
The pressure-sensitive adhesive member serves as a mediator that accommodates length matching for aesthetic purposes while allowing differential stress distribution during rolling, preventing crack formation despite the visual optimization.
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 the reliability of rollable display devices by reducing stress on components during the rolling process, minimizing the occurrence of buckling and cracking, and improving the overall performance and durability of the device.
Implementation Method 1
a first pressure sensitive adhesive member arranged under the window member
Data Source
AI summary
A rollable display device includes: a window member; a first pressure sensitive adhesive member arranged under the window member; a display module detachable from and attachable to the window member by the first pressure sensitive adhesive member; a housing having a groove through which the window member, the first pressure sensitive adhesive member, and the display module are configured to enter and exit from the housing; a first rotation member on which the window member and the first pressure sensitive adhesive member are rollable or slidable; and a second rotation member on which the display module is rollable or slidable.