Flexible Display Panel Bending Region Buffer Layer Design
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Solution Overview
Problem
Conventional flexible display panels face damage due to tensile or compressive stresses during bending, leading to reduced lifespan, as the bending portion lacks display pixels and metal traces, which are minimized to prevent damage, but this reduces pixel density and display quality.
Innovation Solution
A flexible display panel design with non-bending regions and a bending region, where the bending region includes an organic light emitting device layer and a buffer layer, and the driving layer has a higher metal density and narrower metal width near the bending area, allowing for image display and reduced metal trace damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal traces are reduced or removed from the bending portion to prevent damage, then the reliability and lifespan of the display panel is improved, but the pixel density and display quality are reduced
Solution Approach 1:
The patent applies local quality by differentiating the structure between bending and non-bending regions. In the bending region, only the organic light emitting device layer is provided without metal traces, while in the non-bending region, both the organic light emitting device layer and driving layer with metal traces are provided. This localized structural differentiation allows the bending region to avoid metal trace damage while maintaining display functionality, and the non-bending region to provide sufficient pixel density and driving signals.
2Adaptability or versatility
If the bending region is made fully flexible to improve adaptability, then the ease of operation is improved, but the metal traces are more susceptible to damage from tensile and compressive stresses
Solution Approach 1:
The patent extracts the metal traces from the bending region entirely, removing the harmful element that causes damage during bending. The driving layer containing metal traces is excluded from the bending region, leaving only the organic light emitting device layer which can flex without suffering from metal trace damage. This extraction allows the bending region to achieve full flexibility and adaptability without the harmful effects of stress on metal traces.
3Productivity
If display pixels are provided in the bending region to improve display quality, then the productivity and display effect are improved, but the reliability decreases due to stress damage
Solution Approach 1:
The patent segments the display panel into bending and non-bending regions with distinct functional assignments. The bending region contains only the organic light emitting device layer for display functionality without metal traces, ensuring stress resistance. The non-bending region contains both layers for full driving functionality. This segmentation allows display pixels to exist in the bending region for improved display quality while the absence of metal traces maintains reliability under stress.
Data Source
AI summary
The present application discloses a flexible display panel and a method for fabricating thereof, and a flexible display apparatus. The flexible display panel including at least two non-bending regions and a bending region disposed between the at least two non-bending regions, at least one of the at least two non-bending regions is used as a display region; both the non-bending region and the bending region include the flexible substrate and the organic light emitting device layer, wherein the display region is further provided with at least one metal layer for providing a driving signal to the organic light emitting device layer, and the bending region is further provided with a buffer layer. When meeting the demand of display image in the bending region, the probability of damaging to the metal traces influenced by the bending in the bending region is reduced to increase the life time of the display panel.