Stress Control Member in Foldable Display Optical Sheet
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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 performance and reliability, and existing designs often require larger bezel areas to accommodate stress control elements, which can lead to defects from contaminants.
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, featuring a stress control layer that overlaps specific areas of the display panel and a gasket pattern aligned with the optical sheet to minimize gaps and contamination risks.
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 with the optical sheet by positioning the optical sheet's recessed area to receive and accommodate the stress control member. This merging of functions reduces the number of separate components and simplifies the overall structure while maintaining stress control capability.
Solution Approach 2:
The optical sheet serves as an intermediary component that both transmits light and houses the stress control member. By making the optical sheet multi-functional, the patent avoids adding a completely separate stress control structure, thereby improving reliability without proportionally increasing complexity.
2Area of stationary object
If the bezel area is reduced to improve portability, then area of stationary object is reduced, but manufacturing precision becomes more difficult to maintain
Solution Approach 1:
The optical sheet is segmented with a recessed area that is specifically positioned to receive the stress control member. This segmentation allows the bezel area to be minimized while providing a dedicated space for the stress control function, maintaining precision through structured design.
Solution Approach 2:
The stress control member is positioned in the third dimension (depth) by utilizing the recessed area of the optical sheet, rather than requiring additional horizontal space in the bezel area. This dimensional transition allows minimal bezel width while accommodating the stress control component with high precision.
3Reliability
If the optical sheet is made larger to accommodate stress control, then area of moving object increases, but the display area ratio decreases
Solution Approach 1:
The stress control member is nested within the recessed area of the optical sheet. This nesting arrangement allows the stress control functionality to be included within the existing optical sheet footprint without increasing the overall optical sheet area, thereby maintaining a high display area ratio.
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.