Optical Sheet Recess Layout for Bendable Display Stress Relief
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Solution Overview
Problem
Stresses caused by bending in display devices, particularly where they are coupled with electronic modules, can adversely affect the performance and reliability of the display, and existing designs often require larger bezel areas to accommodate stress control elements, which can lead to defects from contaminants like water.
Innovation Solution
A display device design that incorporates a stress control member and an optical sheet with a recessed area to reduce stress and bezel size, where the optical sheet does not overlap with the stress control member, and a gasket pattern is used to minimize gaps and prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stress control member is added to reduce bending stress, then reliability is improved, but device complexity increases
Solution Approach 1:
The stress control member is integrated within the optical sheet structure, forming a nested configuration where the stress control member is positioned in a recessed area of the optical sheet. This nesting approach allows the stress control function to be incorporated without adding separate external components, thereby improving reliability while minimizing increases in device complexity.
2Area of stationary object
If the optical sheet is made smaller to reduce bezel area, then area is improved, but manufacturing precision requirements increase
Solution Approach 1:
The optical sheet features a recessed area that creates a local structural variation, allowing the stress control member to be positioned precisely in this recessed region. This local quality change enables better alignment and positioning of the stress control member, reducing the need for high overall manufacturing precision while still achieving the desired stress control effect and minimizing bezel area.
3Volume of moving object
If the display device is made thinner for portability, then volume is improved, but stress concentration increases
Solution Approach 1:
The stress control member is nested within the optical sheet's recessed area, creating a multi-layered structure that provides stress control functionality within the thin profile of the display device. This nested configuration allows the device to maintain a thin overall thickness while incorporating the stress control function that prevents stress concentration during bending.
4Strength
If the optical sheet overlaps the stress control member, then structural integrity is improved, but contaminant protection decreases
Solution Approach 1:
The stress control member is extracted from the overlapping region with the optical sheet and positioned in a recessed area where it does not overlap with the optical sheet. This extraction approach maintains structural integrity through the recessed design while preventing contaminants from entering the gap between the optical sheet and stress control member, thereby protecting against harmful factors.
Data Source
AI summary
A display device includes an electronic panel, a window, an optical sheet, and a stress control member. The electronic panel includes a first non-bending area having a first area overlapping the optical sheet and a second area overlapping at least part of the recessed area, a bending area configured to be bent relative to the first non-bending area, and a second non-bending area extending from the bending area and movable to a position opposing the first non-bending area. The optical sheet is disposed between the electronic panel and the window and having a recessed area defined therein extending toward a center of the optical sheet. The stress control member overlaps with at least a portion of the second area, at least a portion of the bending area, and at least a portion of the second non-bending area, respectively.