OLED Display Panel Bending Region Metal Trace Stress Management
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Solution Overview
Problem
Conventional OLED display panels face issues with metal trace cracks during bending, leading to stress concentration, signal transmission failure, and abnormal screen behavior, which hinders yield and mass production feasibility.
Innovation Solution
The OLED display panel incorporates a bending region with a metal trace featuring through holes of varying distribution densities to manage tensile and compressive stress regions, allowing for efficient stress relief and crack prevention, and includes a reinforcing plate for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal traces are integrated into the lower edge of the OLED display panel and folded to the back side, then signal transmission function is achieved, but stress concentration occurs in the bending region causing cracks and signal transmission failure
Solution Approach 1:
The metal trace is segmented by introducing through holes that divide the continuous metal structure into multiple sections. This segmentation allows the metal trace to better accommodate bending stresses by creating discrete stress zones rather than a continuous stress path, thereby preventing crack propagation while maintaining signal transmission integrity.
Solution Approach 2:
The through holes are non-uniformly distributed with different densities in different regions of the metal trace. The density of through holes is adjusted according to the local stress distribution, with higher density in high-stress regions and lower density in low-stress regions, optimizing the balance between stress relief and structural integrity.
2Adaptability or versatility
If the bending region is designed to allow folding, then flexibility and narrow border achievement are enabled, but stress concentration leads to metal trace cracks and screen abnormality
Solution Approach 1:
The through hole distribution density varies locally across different regions of the metal trace based on the stress concentration patterns. Regions experiencing higher stress during bending have higher through hole density to provide better stress relief, while regions with lower stress have lower through hole density to maintain structural continuity and signal transmission quality.
Solution Approach 2:
The physical parameters of the metal trace are modified by introducing through holes with specific sizes, shapes, and distribution patterns. These parameter changes alter the mechanical properties of the metal trace, making it more compliant with bending stresses while maintaining its electrical conductivity and structural integrity.
3Reliability
If through holes are added to the metal trace to relieve stress, then crack prevention is improved, but manufacturing complexity increases
Solution Approach 1:
The through holes are designed with optimized parameters including size, shape, and distribution density that can be directly implemented using standard manufacturing processes. The parameters are tuned to achieve effective stress relief while remaining compatible with existing fabrication capabilities, minimizing the need for complex or specialized manufacturing steps.
Data Source
AI summary
The present disclosure provides an organic light emitting diode (OLED) display panel and a display panel which include a display region, a binding region, and a bending region. A metal trace inside the bending regions generates a tensile stress region and a compressive stress region. A plurality of through holes are disposed on the metal trace. A distribution density of the through holes corresponding to the tensile stress region is different from distribution density of the through holes corresponding to the compressive stress region. It may relieve the stress, reduce the problems such as failure and bad products, reduce the bending angle to be smaller, and achieve narrower borders.