Display Device Corner Stress Management via Spaced Cushioning Layers
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Solution Overview
Problem
Display devices with bent edge regions experience defects due to compressing stresses at the corner portions, leading to issues like buckling and cracking, which can affect the display area and the operation of the driving circuit.
Innovation Solution
Incorporating additional layers, such as resin or metal, between the protection film and the support member, which are spaced and have varying thicknesses, to absorb compressing stresses and prevent defects by increasing the Z-overlap at the corner portions, thereby reducing the risk of buckling or cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the edge region is bent to minimize the bezel region, then the display area is increased, but compressing stresses are generated at the corner portion causing defects
Solution Approach 1:
The patent applies beforehand cushioning by introducing a cushioning layer between the protection film and the support member at the corner portion. This layer is positioned in advance to absorb compressing stresses that will occur during bending, preventing defects before they happen. The cushioning layer acts as a preventive measure against the known stress concentration issue at bent corners.
Solution Approach 2:
The cushioning layer serves as an intermediary element between the protection film and the support member. It mediates the stress transmission at the corner portion, absorbing and distributing compressing stresses rather than allowing them to concentrate and cause defects. This intermediary layer enables the bent edge structure to function reliably.
2Reliability
If additional layers are added to absorb compressing stresses, then the structural integrity is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by positioning the cushioning layer specifically at the corner portion where compressing stresses occur, rather than adding layers uniformly across the entire display device. This localized approach improves structural integrity at the critical stress point while minimizing the overall increase in device complexity.
Solution Approach 2:
The cushioning layer is segmented into a specific shape that corresponds to the corner portion geometry, with its area and thickness optimized for the local stress distribution. This segmentation allows the additional layer to be precisely where needed, reducing the overall complexity compared to a full-layer approach.
Data Source
AI summary
A display device according to an embodiment includes a display panel including a main display area that displays images and an edge region disposed adjacent to the main display area; a protection film disposed below the display panel; and at least one additional layer disposed below the protection film, wherein the edge region includes a corner portion disposed on a corner, and the at least one additional layer overlap the corner portion and are spaced from each other.