Stiffener Design for Foldable Display Stress Management
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Solution Overview
Problem
Electronic apparatuses face defects when bent due to stress transmission, leading to reliability issues, particularly in areas where signal lines and components interact, causing interference and potential damage.
Innovation Solution
Incorporating a stiffener made of stainless steel between the cover member and the driving element, with a predetermined space from protection members, to absorb stress and prevent interference, while using a functional layer for heat dissipation and light blocking, and ensuring a specific distance between protection members and the stiffener to mitigate defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If protection members are disposed close to each other to save space, then device complexity is reduced, but defects occur during bending due to stress concentration
Solution Approach 1:
A stiffener is introduced as an intermediary component between the first and second protection members. This stiffener acts as a mediator that distributes bending stress across the bending area, preventing stress concentration at the interfaces between protection members. The stiffener includes a first portion overlapping the adhesive layer and a second portion protruding towards the cover member, creating a gradual stress transition zone that eliminates defect generation during bending operations.
2Area of stationary object
If signal lines are bent to fit panel space, then area utilization is improved, but electrical signal interference occurs
Solution Approach 1:
The harmful effect of signal line bending is extracted and isolated by introducing the stiffener structure. The stiffener creates a rigid support framework that allows signal lines to be routed through protected channels or along predetermined paths that minimize bending. By separating the structural support function (provided by the stiffener) from the signal transmission function, the patent enables space-efficient routing without exposing signal lines to harmful bending stresses that cause interference.
3Volume of moving object
If components are arranged densely to reduce device size, then volume is reduced, but stress transmission causes defects during bending
Solution Approach 1:
The bending area is segmented into distinct functional zones: a first region with the first protection member overlapping the non-bending area, and a second region with the second protection member overlapping the bending area. The stiffener further segments the structure by introducing a rigid support element that divides the stress distribution pattern. This segmentation allows dense component arrangement in the non-bending area while protecting bending-prone areas through the stiffener's stress-distributing geometry.
Data Source
AI summary
An electronic apparatus includes a display module divided into a bending area and a non-bending area arranged in a first direction and having a front surface and a rear surface opposing the front surface, a cover member covering a portion of the bending area and disposed on the front surface, a first protection member disposed on the rear surface overlapping the non-bending area, a second protection member disposed on the rear surface overlapping the bending area and spaced apart from the first protection member, a driving element disposed on the front surface overlapping the bending area, and a stiffener disposed between the cover member and the driving element on the front surface. The bending area is bent along a virtual bending axis extending in a second direction perpendicular to the first direction, and the cover member and the stiffener expose a portion of the front surface through a space therebetween.