Foldable Display Protective Film Structure for Anti-Peeling Hinges
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Solution Overview
Problem
Foldable electronic devices face challenges in protecting their flexible display panels from damage during folding, particularly due to stress and peeling of the display protective film, which can occur when the device is folded or unfolded.
Innovation Solution
The electronic device incorporates a flexible display panel with a display protective film featuring protrusions and a dent region to distribute stress, paired with a dust cover member that tilts during folding to maintain a gap with the protective film, preventing contact and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display protective film is made to cover the entire flexible display panel including bending zones, then the protective coverage is improved, but the film is more prone to peeling and stress damage during folding
Solution Approach 1:
The display protective film is divided into multiple regions: a first region covering the non-bending zone and a second region covering the bending zone. This segmentation allows different portions of the film to be optimized for their specific functional requirements, with the second region being thinner to accommodate folding stress while the first region provides robust protection in the non-bending area.
Solution Approach 2:
The film thickness is varied locally across different zones of the flexible display panel. The first region has a greater thickness suitable for rigid protection, while the second region has a reduced thickness to minimize stress concentration during bending. This local quality variation ensures that each area of the film has the appropriate mechanical properties for its specific location and function.
2Object-affected harmful factors
If the dust cover member is positioned close to the display protective film to prevent dust ingress, then sealing performance is improved, but the film is susceptible to contact damage during folding
Solution Approach 1:
The dust cover member is designed with dynamic positioning capability, allowing it to tilt relative to the display protective film during folding operations. The dust cover can maintain a predetermined gap from the film in the unfolded state for optimal dust protection, then tilt to create additional clearance during folding to prevent contact damage, and return to its original position when unfolded.
3Volume of moving object
If the flexible display panel is designed to fold tightly to achieve compact form factor, then portability is improved, but the display protective film experiences increased stress and peeling
Solution Approach 1:
A dent region is pre-formed in the dust cover member at the location where it would contact the display protective film during folding. This preliminary structural feature ensures that when folding occurs, the dent region provides clearance space, preventing the dust cover from applying stress to the film and reducing the risk of peeling before the folding action even begins.
Data Source
AI summary
An electronic device includes a first housing, a second housing coupled to the first housing to be pivotable about an axis, a hinge portion connecting the first housing to the second housing, a flexible display panel mounted across the first housing and the second housing. The flexible display panel includes a bending zone with a predetermined width from a folding line provided in a first direction parallel to a hinge axis of the hinge portion, a pair of protective caps respectively arranged on both ends of the hinge portion, and a display protective film provided on a front surface of the flexible display pane. The display protective film includes a main portion extending along a plane of the flexible display panel and a first protrusion and a second protrusion, respectively extending from both lateral surfaces of the main portion toward the pair of protective caps.