Bending Area Coupling Layer Thickness Gradient for Display Panel Attachment
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Solution Overview
Problem
Organic light-emitting display devices are prone to damage from shocks and excessive heat, and the functional sheets used for heat dissipation and buffering can detach from the display panel due to restoring forces when bent, leading to potential penetration of external foreign matter.
Innovation Solution
A panel bottom sheet with a gentler curvature than the display panel, coupled with a panel-sheet coupling layer that decreases in thickness from the center to the sides of the bending area, enhancing coupling strength and reducing restoring forces, ensuring the sheet remains attached and functional.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the panel bottom sheet is bent to match the display panel's curvature, then the sheet can be attached to the bent display panel, but the restoring force causes the sheet to detach from the panel
Solution Approach 1:
The patent changes the curvature parameter of the panel bottom sheet to be gentler than the display panel's curvature. This parameter modification reduces the restoring force generated by the sheet while maintaining its ability to conform to and attach to the bent display panel, thereby preventing detachment.
2Strength
If a uniform thickness coupling layer is used, then the manufacturing process is simple, but the coupling strength is insufficient in the bending area
Solution Approach 1:
The patent applies local quality by making the coupling layer thickness non-uniform, specifically increasing the thickness in the bending area compared to the flat area. This localized thickness increase enhances the coupling strength where it is most needed (in the bending area) while keeping the overall structure relatively simple.
Data Source
AI summary
A display device includes: a display panel including a flat area and a bending area positioned adjacent to the flat area, a panel bottom sheet arranged under the display panel and overlapping with the flat area and the bending area, and a panel-sheet coupling layer between the display panel and the panel bottom sheet and including a first panel-sheet coupling part arranged across the flat area and the bending area, and a second panel-sheet coupling part overlapping with the bending area and extended continuously along a side of the first panel-sheet coupling part, a thickness of the panel-sheet coupling layer becoming smaller from a central portion of the bending area toward a side portion of the bending area, and the panel bottom sheet having a curved shape that is gentler than a curved shape of the display panel.