Flexible Display Panel with Independent Support Substrate for Impact Resistance
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Solution Overview
Problem
Foldable organic electroluminescence (EL) display devices face challenges in maintaining impact resistance and flexibility due to local deformation from point impacts, such as pen drops, and issues with undulation and folding habits, particularly because existing solutions like metal films and adhesive layers do not adequately address these issues across different regions of the display panel.
Innovation Solution
A display device configuration featuring a flexible display panel with flat and bendable portions, a support substrate covering the entire panel, and a housing with a gap between the substrate and the panel, allowing independent bending and improved impact absorption, while maintaining flexibility and preventing undulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal film is provided as an impact absorption layer in the display region, then impact resistance is improved, but the metal film may not be sufficiently bent for large point impacts and the display panel may still be locally deformed
Solution Approach 1:
The support substrate is divided into a rigid support substrate for the non-bendable region and a flexible support substrate for the bendable region, allowing each region to have optimized mechanical properties for its specific function
Solution Approach 2:
Different regions of the display panel are provided with different support substrates having different rigidity characteristics - the non-bendable region receives rigid support for stability while the bendable region receives flexible support for deformability
2Stability of the object's composition
If adhesive layers are provided between the display region and support substrates, then the display panel is held in place, but the adhesive layers are locally deformed by point impacts causing local deformation of the display panel
Solution Approach 1:
The adhesive layer is segmented into frame region adhesive layers positioned only in the frame region, separating the bonding function from the impact absorption function, allowing the display region to move independently during impact events
3Stability of the object's composition
If the panel configuration is made different between the non-bendable region and bendable region to solve undulation and folding habit problems, then structural stability is improved, but the flexibility of the display panel deteriorates
Solution Approach 1:
The support substrate system is segmented into rigid and flexible components, allowing the non-bendable region to have rigid support for stability while the bendable region maintains flexible support for adaptability
Solution Approach 2:
Different support characteristics are provided locally to different regions - rigid support in the frame region for structural stability and flexible support in the display region for bending capability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances both impact resistance against large point impacts and maintains the flexibility of the display panel, reducing the likelihood of cracks in the TFT layer and improving the overall durability and usability of the foldable display.
Implementation Method 1
a support substrate supporting the display panel in a flat manner
Implementation Method 2
a flexible display panel including a display region including a pair of flat portions held in a flat manner and a bendable portion disposed between the pair of flat portions and held in a bendable manner
Data Source
AI summary
A flexible display panel including a display region including a pair of flat portions held in a flat manner and a bendable portion disposed between the pair of flat portions and held in a bendable manner and a frame region provided in a periphery of the display region, a support substrate supporting the display panel in a flat manner, and a housing supporting the support substrate are provided, and in the display region, the display panel and the support substrate are not fixed to each other and a gap is formed between the support substrate and the housing.