Flexible Display Organic Layer Segmentation for Stress Relief
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Solution Overview
Problem
Organic light-emitting displays fabricated on flexible plastic substrates are prone to operational faults due to stress-induced peeling of the organic layer, which occurs when the substrate is bent or rolled, resulting from its low adhesion strength.
Innovation Solution
The organic layer is divided into multiple lines spaced apart, with gaps that do not overlap the light-emitting parts but rather the driving parts, and organic film patterns are placed between these lines to enhance adhesion and reduce stress when the display is bent, thereby preventing peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the organic layer is formed as a continuous film over the entire display area, then the light emission uniformity is improved, but the adhesion strength decreases and stress concentration occurs during bending
Solution Approach 1:
The organic layer is divided into multiple independent linear patterns arranged in parallel, rather than forming a continuous film. Each linear pattern is separated by gaps, which prevents stress concentration and peeling during substrate bending while maintaining sufficient light emission area for display functionality
Solution Approach 2:
The gaps between organic layer patterns are strategically positioned to overlap with driving parts (non-light-emitting regions) rather than light-emitting parts. This local differentiation allows the organic layer to be segmented for stress relief while ensuring that light-emitting regions maintain continuous coverage for uniform illumination
2Adaptability or versatility
If the flexible substrate is bent or rolled for compact storage, then the portability is improved, but stress is applied to the organic layer causing peeling and operational faults
Solution Approach 1:
The organic layer is segmented into multiple independent linear patterns with gaps between them. This segmentation allows the substrate to be bent or rolled for portable storage while preventing stress concentration that would cause peeling, thereby maintaining operational reliability during flexible deformation
Solution Approach 2:
The gaps between organic layer patterns are designed in advance to coincide with driving parts, creating predetermined stress relief zones. This beforehand cushioning prevents peeling and operational faults before they can occur during substrate bending or rolling for portable use
Data Source
AI summary
Display devices are disclosed herein. In one embodiment, the display device includes a plastic substrate comprising a display area and a non-display area, and a data pad portion disposed on one side of the non-display area, with a flexible circuit board bonded thereto, the display area including a plurality of subpixels positioned on the display area, each subpixel including an organic light-emitting diode that includes an organic layer, wherein the organic layer extends continuously from one side of the display area to the other side of the display area and is arranged in a plurality of lines that are spaced apart from one another and disposed parallel to the data pad portion.