Flexible Display Inorganic Layer Segmentation for Impact Resistance
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Solution Overview
Problem
Existing flexible display devices lack sufficient impact resistance, making them vulnerable to damage from external forces such as drops or bends, which can lead to cracks in the inorganic layers and subsequent defects.
Innovation Solution
The display device incorporates a base layer with inorganic layers featuring openings that surround element regions, an organic layer inside these openings, and a pixel driving circuit and light emitting elements connected to the organic layer. The inorganic stacked structure is designed with polygonal or circular shapes to disperse stress and prevent crack propagation, and the display panel is covered with a thin film encapsulation layer and a color filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the display device uses a conventional rigid structure, then manufacturing precision is improved, but impact resistance deteriorates
Solution Approach 1:
The inorganic layers are divided into multiple separate inorganic stacked structures, each corresponding to an element region. These segmented structures are separated by organic layers, allowing independent stress management for each region while maintaining overall structural integrity during impact events
Solution Approach 2:
The display device employs flexible thin film structures including the base layer, inorganic layers, and organic layers that can bend and deform elastically under impact forces. The flexible nature of these thin films allows the structure to absorb impact energy without cracking, resolving the contradiction between rigidity for manufacturing precision and flexibility for impact resistance
2Stability of the object's composition
If the inorganic layers are made continuous and rigid, then structural stability is improved, but crack propagation resistance deteriorates
Solution Approach 1:
The inorganic layers are segmented into discrete inorganic stacked structures separated by organic layers. This segmentation prevents crack propagation by isolating potential crack sources within individual element regions, while the overall structural stability is maintained through the organized arrangement and electrical connectivity of these segmented structures
Solution Approach 2:
The organic layer acts as an intermediary between adjacent inorganic stacked structures. It provides mechanical separation that prevents crack propagation while maintaining structural organization, and electrically connects adjacent pixel driving circuits to preserve functionality despite the physical segmentation
3Adaptability or versatility
If the display device is made flexible for folding, then adaptability is improved, but impact resistance deteriorates
Solution Approach 1:
The segmented inorganic stacked structures allow the flexible display to maintain structural integrity during folding by distributing stress across multiple independent regions. Each segment can deform independently during bending, preventing the formation of critical stress concentrations that would lead to cracks in a continuous rigid structure
Solution Approach 2:
The display employs flexible thin film structures throughout, including the base layer, inorganic layers, and organic layers. These flexible films enable the device to be folded and rolled while maintaining impact resistance, as the flexible nature allows energy absorption through elastic deformation rather than brittle fracture
Data Source
AI summary
A display device that includes multiple inorganic layers having an opening defined in at least some of the inorganic layers, a pixel driving circuit disposed in a region defined by the opening in a plan view, and a light emitting element electrically connected to the pixel driving circuit. The at least some of the inorganic layers include an inorganic stacked structure disposed in the region defined by the opening. The inorganic stacked structure has a substantially polygonal or circular shape including a corner region having an outwardly convex curve in a plan view.