Flexible Display Panel Bending Region Stress Management
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Solution Overview
Problem
Existing flexible display devices face challenges in reducing stress and enhancing the flexibility of bendable parts, particularly in designs that are rollable or foldable, as they often suffer from structural limitations that affect their durability and usability.
Innovation Solution
The display device incorporates a bending region with copy pixels driven by boundary region circuits, connected by lines, and features cutout portions in the inorganic films to distribute stress and improve flexibility, including a substrate with inorganic films and planarization films to manage connecting lines and electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display panel is made flexible and bendable, then the adaptability and versatility are improved, but the stress and durability issues worsen
Solution Approach 1:
The display panel is divided into a bending region and a non-bending region, with the bending region further segmented into multiple sub-regions. This segmentation allows different parts of the panel to have different functional requirements, enabling the bending region to be optimized for flexibility while the non-bending region maintains structural integrity for durability.
Solution Approach 2:
Different regions of the display panel are assigned different structural properties. The bending region has a specific structure optimized for flexibility with appropriate layer configurations, while the non-bending region has a structure optimized for durability. This local differentiation resolves the contradiction by allowing both flexibility and durability to be optimized in their respective locations.
2Ease of operation
If the bending region structure is optimized for flexibility, then the ease of operation is improved, but the manufacturing complexity increases
Solution Approach 1:
The display panel structure is designed to be dynamic rather than static, with the bending region capable of changing its shape and configuration during operation. This dynamic design allows the panel to adapt to different operational states (bent vs. flat) while maintaining a relatively simple base structure that can accommodate these changes through controlled deformation of specific layers.
Data Source
AI summary
A display device capable of reducing stress applied to a display panel and improving the flexibility of a bendable part of the display panel is provided. According to an embodiment, a display device includes a display panel including a bending region which is partially bent, and a boundary region which is connected to the bending region, a bent location of the bending region varies so that the area of the display panel being exposed in one direction changes, the boundary region includes a plurality of pixels and a plurality of driving circuits for driving the pixels, and the bending region includes a plurality of copy pixels which are driven by the driving circuits of the boundary region.