Flexible Display Panel Stress Management for Element Integrity
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Solution Overview
Problem
Flexible display panels with bent regions experience constant stress, leading to cracking or breaking of active and display elements due to insufficient stress relief, despite existing stress relief layers.
Innovation Solution
A display device configuration with a flexible display panel featuring a layered film structure including a resin layer, barrier layer, TFT layer, and sealing layer, where a stress adjustment layer is strategically positioned to manage film stress, ensuring the absolute value of film stress in the bending region is greater than in the flat region, thereby preventing element breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the flexible display panel is fixed with one region flat and another region bent, then the display device achieves a curved display configuration, but constant stress causes active elements and display elements to crack or break
Solution Approach 1:
The patent applies preliminary anti-action by introducing a stress relief layer in the bending region before the panel is subjected to bending stress. This pre-configured stress relief structure counteracts the constant stress that will be applied when the panel is fixed in a curved configuration, preventing element breakage while maintaining the desired curved display shape.
Solution Approach 2:
The patent utilizes flexible thin films, specifically the stress relief layer, to enable the display panel to achieve a curved configuration without element breakage. The stress relief layer acts as a flexible component that can accommodate bending while protecting the brittle active and display elements from stress-induced damage.
Data Source
AI summary
In a case in which a curvature of a flexible organic EL display panel provided in a display device is zero, an absolute value of film stress of a first layered film, from a lower face film, formed in first regions in the flexible organic EL display panel is compressive stress and is greater than an absolute value of film stress of a second layered film, from the lower face film, formed in a second region.